Publications

Müller, R, Drouin, N & Sankaran, S 2019, Organizational Project Management, 1, Edward Elgar Publishing, Cheltenham, UK.
View/Download from: Publisher's site
View description>>

This concise text introduces an integrated view of all project management-related activities in an organization, called Organizational Project Management (OPM). Practical cases from several organizations, as well as popular theories such as the Resource-Based Theory and Institutional Theory provide for an insightful yet realistic understanding of OPM as an integrative tool for organizations to improve their efficiency and effectiveness. The reader will learn how separate organizational functions, such as project, program and portfolio management and governance integrate in a cohesive manner. The authors describe how different approaches to competing in the marketplace link to strategies, and the ways of selecting the ‘best’ business opportunities for organizations and integrating them into existing workflows and structures. They develop and describe a model that shows how OPM works within organizations. The book is a valuable resource for top managers, reflective practitioners, academics, and postgraduate students in organization theory.

Webster, C, Jusufi, A & Liu, D 2019, 'A Comparative Survey of Climbing Robots and Arboreal Animals in Scaling Complex Environments' in Mechanisms and Machine Science, Springer International Publishing, Switzerland, pp. 31-45.
View/Download from: Publisher's site
View description>>

© Springer Nature Switzerland AG 2019. The inchworm-style climbing robot present in current literature will only take us so far towards the robotic maintenance of transmission towers. To continue to push toward developing robots that can perform work in reticular structures we must consider a broader spectrum of animals for inspiration. The abilities of Primates in climbing have long been a benchmark in climbing standards, but due to the mechanical and control complexity associated with their development, they are seldom seen in robotics. Birds (specifically Psittaciformes) offer an alternate solution, utilising less degrees-of-freedom whilst maintaining stability and maneuverability. These ancient arboreal specialists may hold they keys to unlocking the next stage in the development of climbing robotics. This work presents lessons learned from a review on primates as well as some preliminary observations on the climbing capabilities of Psittaciformes.

Best, G, Cliff, OM, Patten, T, Mettu, RR & Fitch, R 2019, 'Dec-MCTS: Decentralized planning for multi-robot active perception', The International Journal of Robotics Research, vol. 38, no. 2-3, pp. 316-337.
View/Download from: Publisher's site
View description>>

We propose a decentralized variant of Monte Carlo tree search (MCTS) that is suitable for a variety of tasks in multi-robot active perception. Our algorithm allows each robot to optimize its own actions by maintaining a probability distribution over plans in the joint-action space. Robots periodically communicate a compressed form of their search trees, which are used to update the joint distribution using a distributed optimization approach inspired by variational methods. Our method admits any objective function defined over robot action sequences, assumes intermittent communication, is anytime, and is suitable for online replanning. Our algorithm features a new MCTS tree expansion policy that is designed for our planning scenario. We extend the theoretical analysis of standard MCTS to provide guarantees for convergence rates to the optimal payoff sequence. We evaluate the performance of our method for generalized team orienteering and online active object recognition using real data, and show that it compares favorably to centralized MCTS even with severely degraded communication. These examples demonstrate the suitability of our algorithm for real-world active perception with multiple robots.

Bykerk, L, Quin, P & Liu, D 2019, 'A Method for Selecting the Next Best Angle-of-Approach for Touch-Based Identification of Beam Members in Truss Structures', IEEE Sensors Journal, vol. 19, no. 10, pp. 3939-3949.
View/Download from: Publisher's site
View description>>

© 2001-2012 IEEE. A robot designed to climb truss structures such as power transmission towers is expected to have an adequate tactile sensing in the grippers to identify a structural beam member and its properties. Depending on how a gripper grasps a structural member, defined as the Angle-of-Approach (AoA), the extracted tactile data can result in erroneous identifications due to the similarities in beam cross-sectional shapes and sizes. In these cases, further grasps at favorable Angles-of-Approach (AoAs) are required to correctly identify the beam member and its properties. This paper presents an information-based method which uses tactile data to determine the next best AoA for the identification of beam members in truss structures. The method is used in conjunction with a state estimate of beam shape, dimension, and AoA calculated by a Random Forest classifier. The method is verified through simulation by using the data collected using a soft gripper retrofitted with simple tactile sensors. The results show that this method can correctly identify a structural beam member and its properties with a small number of grasps (typically fewer than 4). This method can be applied to other adaptive robotic gripper designs fitted with suitable tactile sensors, regardless of the number of sensors used and their layout.

Cui, Y, Poon, J, Miro, JV, Yamazaki, K, Sugimoto, K & Matsubara, T 2019, 'Environment-adaptive interaction primitives through visual context for human–robot motor skill learning', Autonomous Robots, vol. 43, no. 5, pp. 1225-1240.
View/Download from: Publisher's site
View description>>

© 2018, The Author(s). In situations where robots need to closely co-operate with human partners, consideration of the task combined with partner observation maintains robustness when partner behavior is erratic or ambiguous. This paper documents our approach to capture human–robot interactive skills by combining their demonstrative data with additional environmental parameters automatically derived from observation of task context without the need for heuristic assignment, as an extension to overcome shortcomings of the interaction primitives framework. These parameters reduce the partner observation period required before suitable robot motion can commence, while also enabling success in cases where partner observation alone was inadequate for planning actions suited to the task. Validation in a collaborative object covering exercise with a humanoid robot demonstrate the robustness of our environment-adaptive interaction primitives, when augmented with parameters directly drawn from visual data of the task scene.

Gentil, CL, Vidal-Calleja, T & Huang, S 2019, 'IN2LAAMA: INertial Lidar Localisation Autocalibration And MApping', IEEE Transactions on Robotics, vol. 37, no. 1, pp. 275-290.
View/Download from: Publisher's site
View description>>

In this paper, we present INertial Lidar Localisation Autocalibration AndMApping (IN2LAAMA): an offline probabilistic framework for localisation,mapping, and extrinsic calibration based on a 3D-lidar and a 6-DoF-IMU. Most oftoday's lidars collect geometric information about the surrounding environmentby sweeping lasers across their field of view. Consequently, 3D-points in onelidar scan are acquired at different timestamps. If the sensor trajectory isnot accurately known, the scans are affected by the phenomenon known as motiondistortion. The proposed method leverages preintegration with a continuousrepresentation of the inertial measurements to characterise the system's motionat any point in time. It enables precise correction of the motion distortionwithout relying on any explicit motion model. The system's pose, velocity,biases, and time-shift are estimated via a full batch optimisation thatincludes automatically generated loop-closure constraints. The autocalibrationand the registration of lidar data rely on planar and edge features matchedacross pairs of scans. The performance of the framework is validated throughsimulated and real-data experiments.

Ghaffari Jadidi, M, Valls Miro, J & Dissanayake, G 2019, 'Sampling-based incremental information gathering with applications to robotic exploration and environmental monitoring', The International Journal of Robotics Research, vol. 38, no. 6, pp. 658-685.
View/Download from: Publisher's site
View description>>

We propose a sampling-based motion-planning algorithm equipped with an information-theoretic convergence criterion for incremental informative motion planning. The proposed approach allows dense map representations and incorporates the full state uncertainty into the planning process. The problem is formulated as a constrained maximization problem. Our approach is built on rapidly exploring information-gathering algorithms and benefits from the advantages of sampling-based optimal motion-planning algorithms. We propose two information functions and their variants for fast and online computations. We prove an information-theoretic convergence for an entire exploration and information-gathering mission based on the least upper bound of the average map entropy. A natural automatic stopping criterion for information-driven motion control results from the convergence analysis. We demonstrate the performance of the proposed algorithms using three scenarios: comparison of the proposed information functions and sensor configuration selection, robotic exploration in unknown environments, and a wireless signal strength monitoring task in a lake from a publicly available dataset collected using an autonomous surface vehicle.

Gracia, L, Solanes, JE, Muñoz-Benavent, P, Miro, JV, Perez-Vidal, C & Tornero, J 2019, 'Human-robot collaboration for surface treatment tasks', Interaction Studies. Social Behaviour and Communication in Biological and Artificial Systems, vol. 20, no. 1, pp. 148-184.
View/Download from: Publisher's site
View description>>

Abstract This paper presents a human-robot closely collaborative solution to cooperatively perform surface treatment tasks such as polishing, grinding, finishing, deburring, etc. The proposed scheme is based on task priority and non-conventional sliding mode control. Furthermore, the proposal includes two force sensors attached to the manipulator end-effector and tool: one sensor is used to properly accomplish the surface treatment task, while the second one is used by the operator to guide the robot tool. The applicability and feasibility of the proposed collaborative solution for robotic surface treatment are substantiated by experimental results using a redundant 7R manipulator: the Sawyer collaborative robot.

Hassan, M, Liu, D & Xu, D 2019, 'A Two-Stage Approach to Collaborative Fiber Placement through Coordination of Multiple Autonomous Industrial Robots', Journal of Intelligent & Robotic Systems, vol. 95, no. 3-4, pp. 915-933.
View/Download from: Publisher's site
View description>>

© 2018, Springer Nature B.V. The use of multiple Autonomous Industrial Robots (AIRs) as opposed to a single AIR to perform fiber placement brings about many challenges which have not been addressed by researchers. These challenges include optimal division and allocation of the work and performing path planning in a coordinated manner while considering the requirements and constraints that are unique to the fiber placement task. To solve these challenges, a two-stage approach is proposed in this paper. The first stage considers multiple objectives to optimally allocate each AIR with surface areas, while the second stage aims to generate coordinated paths for the AIRs. Within each stage, mathematical models are developed with several unique objectives and constraints that are specific to the multi-AIR collaborative fiber placement. Several case studies are presented to validate the approach and the proposed mathematical models. Comparison studies with different number of AIRs and variations of the developed mathematical models are also presented.

Hodges, J, Attia, T, Arukgoda, J, Kang, C, Cowden, M, Doan, L, Ranasinghe, R, Abdelatty, K, Dissanayake, G & Furukawa, T 2019, 'Multistage bayesian autonomy for high‐precision operation in a large field', Journal of Field Robotics, vol. 36, no. 1, pp. 183-203.
View/Download from: Publisher's site
View description>>

AbstractThis paper presents a generalized multistage bayesian framework to enable an autonomous robot to complete high‐precision operations on a static target in a large field. The proposed framework consists of two multistage approaches, capable of dealing with the complexity of high‐precision operation in a large field to detect and localize the target. In the multistage localization, locations of the robot and the target are estimated sequentially when the target is far away from the robot, whereas these locations are estimated simultaneously when the target is close. A level of confidence (LOC) for each detection criterion of a sensor and the associated probability of detection (POD) of the sensor are defined to make the target detectable with different LOCs at varying distances. Differential entropies of the robot and target are used as a precision metric for evaluating the performance of the proposed approach. The proposed multistage observation and localization approaches were applied to scenarios using an unmanned ground vehicle (UGV) and an unmanned aerial vehicle (UAV). Results with the UGV in simulated environments and then real environments show the effectiveness of the proposed approaches to real‐world problems. A successful demonstration using the UAV is also presented.

Huang, S 2019, 'A review of optimisation strategies used in simultaneous localisation and mapping', Journal of Control and Decision, vol. 6, no. 1, pp. 61-74.
View/Download from: Publisher's site
View description>>

© 2018, © 2018 Northeastern University, China. This paper provides a brief review of the different optimisation strategies used in mobile robot simultaneous localisation and mapping (SLAM) problem. The focus is on the optimisation-based SLAM back end. The strategies are classified based on their purposes such as reducing the computational complexity, improving the convergence and improving the robustness. It is clearly pointed out that some approximations are made in some of the methods and there is always a trade-off between the computational complexity and the accuracy of the solution. The local submap joining is a strategy that has been used to address both the computational complexity and the convergence and is a flexible tool to be used in the SLAM back end. Although more research is needed to further improve the SLAM back end, nowadays there are quite a few relatively mature SLAM back end algorithms that can be used by SLAM researchers and users.

Khosoussi, K, Giamou, M, Sukhatme, GS, Huang, S, Dissanayake, G & How, JP 2019, 'Reliable Graphs for SLAM', The International Journal of Robotics Research, vol. 38, no. 2-3, pp. 260-298.
View/Download from: Publisher's site
View description>>

Estimation-over-graphs (EoG) is a class of estimation problems that admit a natural graphical representation. Several key problems in robotics and sensor networks, including sensor network localization, synchronization over a group, and simultaneous localization and mapping (SLAM) fall into this category. We pursue two main goals in this work. First, we aim to characterize the impact of the graphical structure of SLAM and related problems on estimation reliability. We draw connections between several notions of graph connectivity and various properties of the underlying estimation problem. In particular, we establish results on the impact of the weighted number of spanning trees on the D-optimality criterion in 2D SLAM. These results enable agents to evaluate estimation reliability based only on the graphical representation of the EoG problem. We then use our findings and study the problem of designing sparse SLAM problems that lead to reliable maximum likelihood estimates through the synthesis of sparse graphs with the maximum weighted tree connectivity. Characterizing graphs with the maximum number of spanning trees is an open problem in general. To tackle this problem, we establish several new theoretical results, including the monotone log-submodularity of the weighted number of spanning trees. We exploit these structures and design a complementary greedy–convex pair of efficient approximation algorithms with provable guarantees. The proposed synthesis framework is applied to various forms of the measurement selection problem in resource-constrained SLAM. Our algorithms and theoretical findings are validated using random graphs, existing and new synthetic SLAM benchmarks, and publicly available real pose-graph SLAM datasets.

Liu, L, Zhang, T, Leighton, B, Zhao, L, Huang, S & Dissanayake, G 2019, 'Robust Global Structure From Motion Pipeline With Parallax on Manifold Bundle Adjustment and Initialization', IEEE Robotics and Automation Letters, vol. 4, no. 2, pp. 2164-2171.
View/Download from: Publisher's site
View description>>

© 2016 IEEE. In this letter, we present a novel global structure from motion (SfM) pipeline that is particularly effective in dealing with low-parallax scenes and camera motion collinear with the features that represent the environment structure. It is therefore particularly suitable in Urban SLAM, in which frequent road-facing motion poses many challenges to conventional SLAM algorithms. Our pipeline includes a recently explored bundle adjustment (BA) method that exploits a feature parameterization using Parallax angle between on-Manifold observation rays (PMBA). It is demonstrated that this BA stage has a consistently stable optimization configuration for features with any parallax and therefore low-parallax features can stay in reconstruction without pre-filtering. To allow practical usage of PMBA, we provide a compatible initialization stage in the SfM to initialize all camera poses simultaneously, exhibiting friendliness to collinear motion. This is achieved by simplifying PMBA into a hybrid graph problem of high connectivity yet small node set size, solved using a robust linear programming technique. Using simulations and a series of publicly available real datasets including 'KITTI' and 'Bundle Adjustment in the Large,' we demonstrate the robustness of the position initialization stage in handling collinear motion and outlier matches, superior convergence performance of the BA stage in the presence of low-parallax features, and effectiveness of our pipeline to handle many sequential or out-of-order urban scenes.

Lu, W & Liu, D 2019, 'A Scalable Sampling-Based Optimal Path Planning Approach via Search Space Reduction', IEEE Access, vol. 7, pp. 153921-153935.
View/Download from: Publisher's site
View description>>

© 2013 IEEE. Many sampling strategies in Sampling-Based Planning (SBP) often consider goal and obstacle population and may however become less efficient in large and cluttered 3D environments with a goal distanced away. This paper presents a search-space-Reduced optimal SBP approach (RSBP) for a rigid body. This reduced space is found by a sparse search tree, which is enabled by a Metric Function (MF) built on a neural network. The offline-learnt MF estimates the minimum traveling cost between any two nodes in a fixed small workspace with various obstacles. It allows connections of two sparse nodes without path planning, where the connections represent the traveling costs (not paths). It is proven that the asymptotic optimality is preserved in the RSBP (assuming a zero-error MF) and the optimality degeneration is bounded (assuming a bounded-error MF). The computational complexity during planning is shown linear to the Lebesgue measure of the entire search space (assuming the same sampling density across environments). Numerical simulations have shown that in tested large and cluttered environments the RSBP is at least as fast as the bidirectional fast marching tree∗ and informed rapidly exploring random tree∗, with planned paths of similar optimality. The results also have shown the RSBP's improved scalability to large environments and enhanced efficiency in dealing with narrow passages.

Müller, R, Drouin, N & Sankaran, S 2019, 'Modeling Organizational Project Management', Project Management Journal, vol. 50, no. 4, pp. 499-513.
View/Download from: Publisher's site
View description>>

The contemporary discourse on organizational project management (OPM) complements project, program, and portfolio management with emerging elements, such as governance, projectification, the project management office (PMO), and organizational design. This creates the need for an integrated model that defines the content and roles in OPM. This article addresses this by conceptually developing a seven-layered model that organizes 22 OPM elements, ranging from the corporate level to the management of individual projects. A theory is developed to explain the interaction of the elements and the layers within the model.

Nguyen, K-D & Liu, D 2019, 'Gibbon-inspired Robust Asymmetric Brachiation along an Upward Slope', International Journal of Control, Automation and Systems, vol. 17, no. 10, pp. 2647-2654.
View/Download from: Publisher's site
View description>>

© 2019, ICROS, KIEE and Springer. This paper investigates the robust control of an underactuated brachiating robot. The control schemes are motivated by the applications that require robots to move through lattice structures, such as the inspection and maintenance of power transmission lines and towers. Inspired by the pendulum-like movements that enable gibbons' arboreal locomotion, the controllers are designed to synchronize the brachiator with a virtual oscillator. Two controllers are proposed: a model-dependent feedback linearization scheme and a sliding-mode scheme that is independent of the system model. These controllers are tasked to drive a robotic brachiator in two cases with different geometries: symmetric geometry, where its links have equal lengths, and asymmetric geometry, where its links have different lengths. The numerical results illustrate that the proposed schemes are robust to the arbitrary initial conditions of the brachiator, the motor torque limitation at the elbow joint, as well as the geometry of the brachiator. Furthermore, they are able to perform successful fast swing-up and dynamic brachiating along a structural member with an upward slope in a unified control framework for both symmetric and asymmetric geometries.

Nguyen, L, Valls Miro, J & Qiu, X 2019, 'Multilevel B-Splines-Based Learning Approach for Sound Source Localization', IEEE Sensors Journal, vol. 19, no. 10, pp. 3871-3881.
View/Download from: Publisher's site
View description>>

© 2001-2012 IEEE. In this paper, a new learning approach for sound source localization is presented using ad hoc either synchronous or asynchronous distributed microphone networks based on the time differences of arrival (TDOA) estimation. It is first to propose a new concept in which the coordinates of a sound source location are defined as the functions of TDOAs, computing for each pair of microphone signals in the network. Then, given a set of pre-recorded sound measurements and their corresponding source locations, the multilevel B-splines-based learning model is proposed to be trained by the input of the known TDOAs and the output of the known coordinates of the sound source locations. For a new acoustic source, if its sound signals are recorded, the correspondingly computed TDOAs can be fed into the learned model to predict the location of the new source. Superiorities of the proposed method are to incorporate the acoustic characteristics of a targeted environment and even remaining uncertainty of TDOA estimations into the learning model before conducting its prediction and to be applicable for both synchronous or asynchronous distributed microphone sensor networks. The effectiveness of the proposed algorithm in terms of localization accuracy and computational cost in comparisons with the state-of-the-art methods was extensively validated on both synthetic simulation experiments as well as in three real-life environments.

Poon, J, Cui, Y, Valls Miro, J & Matsubara, T 2019, 'Learning from demonstration for locally assistive mobility aids', International Journal of Intelligent Robotics and Applications, vol. 3, no. 3, pp. 255-268.
View/Download from: Publisher's site
View description>>

© 2019, The Author(s). Active assistive systems for mobility aids are largely restricted to environments mapped a-priori, while passive assistance primarily provides collision mitigation and other hand-crafted behaviors in the platform’s immediate space. This paper presents a framework providing active short-term assistance, combining the freedom of location independence with the intelligence of active assistance. Demonstration data consisting of on-board sensor data and driving inputs is gathered from an able-bodied expert maneuvring the mobility aid around a generic interior setting, and used in constructing a probabilistic intention model built with Radial Basis Function Networks. This allows for short-term intention prediction relying only upon immediately available user input and on-board sensor data, to be coupled with real-time path generation based upon the same expert demonstration data via Dynamic Policy Programming, a stochastic optimal control method. Together these two elements provide a combined assistive mobility system, capable of operating in restrictive environments without the need for additional obstacle avoidance protocols. Experimental results in both simulation and on the University of Technology Sydney semi-autonomous wheelchair in settings not seen in training data show promise in assisting users of power mobility aids.

Sankaran, S, Vaagaasar, AL & Bekker, MC 2019, 'Assignment of project team members to projects', International Journal of Managing Projects in Business, vol. 13, no. 6, pp. 1381-1402.
View/Download from: Publisher's site
View description>>

PurposeThe purpose of this paper is to investigate how project managers, influence the assignment of project team members by directly assigning or specifying who they want or by indirectly using lateral influence strategies to secure the appropriate resources. This study is part of a wider study investigating the balance between vertical and horizontal leadership in projects in which nomination (or assignment) was identified as a key event contributing to balancing the leadership. It focuses specifically on the nomination or assignment event at the start of a project.Design/methodology/approachBased on the philosophy of critical realism, case studies were used to collect data through 70 semi-structured interviews in Australia, Scandinavia and South Africa. Interviews were conducted with senior managers, project managers and project team members. Two project team members who worked with the same project manager were interviewed to gather diverse views. The data were analyzed individually by researchers from each location using a coding method proposed by Mileset al.(2014). The researchers then jointly analyzed the findings to arrive at five common themes from that explained how team members were assigned in practice.FindingsDespite the recognized need for project managers to form their own teams, this study found that project team members were often assigned by others. This was because project managers lacked authority to secure their resources. Therefore, they used lateral influence strategies to help with assigning project team members. The study identified five lateral influencing strategies adopted by project managers to assign team members: creating an i...

Shakor, P, Nejadi, S & Paul, G 2019, 'A Study into the Effect of Different Nozzles Shapes and Fibre-Reinforcement in 3D Printed Mortar', Materials, vol. 12, no. 10, pp. 1708-1708.
View/Download from: Publisher's site
View description>>

Recently, 3D printing has become one of the most popular additive manufacturing technologies. This technology has been utilised to prototype trial and produced components for various applications, such as fashion, food, automotive, medical, and construction. In recent years, automation also has become increasingly prevalent in the construction field. Extrusion printing is the most successful method to print cementitious materials, but it still faces significant challenges, such as pumpability of materials, buildability, consistency in the materials, flowability, and workability. This paper investigates the properties of 3D printed fibre-reinforced cementitious mortar prisms and members in conjunction with automation to achieve the optimum mechanical strength of printed mortar and to obtain suitable flowability and consistent workability for the mixed cementitious mortar during the printing process. This study also considered the necessary trial tests, which are required to check the mechanical properties and behaviour of the proportions of the cementitious mix. Mechanical strength was measured and shown to increase when the samples were printed using fibre-reinforced mortar by means of a caulking gun, compared with the samples that were printed using the same mix delivered by a progressive cavity pump to a 6 degree-of-freedom robot. The flexural strength of the four-printed layer fibre-reinforced mortar was found to be 3.44 ± 0.11 MPa and 5.78 ± 0.02 MPa for the one-layer. Moreover, the mortar with different types of nozzles by means of caulking is printed and compared. Several experimental tests for the fresh state of the mortar were conducted and are discussed.

Shakor, P, Nejadi, S, Paul, G & Malek, S 2019, 'Review of Emerging Additive Manufacturing Technologies in 3D Printing of Cementitious Materials in the Construction Industry', Frontiers in Built Environment, vol. 4, pp. 1-17.
View/Download from: Publisher's site
View description>>

Additive manufacturing is a fabrication technology that is rapidly revolutionizing the manufacturing and construction sectors. In this paper, a review of various prototyping technologies for printing cementitious materials and selected 3D printing techniques are presented in detail. Benchmark examples are provided to compare three well-known printing techniques; inkjet printing (binder jetting), selected laser sintering (SLS), and extrusion printing (extrusion based process). A comprehensive search in the literature was conducted to identify various mix designs that could be employed when printing cementitious materials. Aspects of concrete mix design are described, and some new experiments are conducted to analyse the printability of new mixes by the authors. Future research in the area of the rheology of cementitious materials and its relationship with the structural performance of finished concretes are highlighted.

Shakor, P, Nejadi, S, Paul, G, Sanjayan, J & Aslani, F 2019, 'Heat curing as a means of postprocessing influence on 3D printed mortar specimens in powderbased 3D printing', Indian Concrete Journal, vol. 93, no. 9, pp. 65-74.
View description>>

Inkjet (Powder-based) three-dimensional printing (3DP) shows significant promise in concrete construction applications. The accuracy, speed, and capacity to build complicated geometries are the most beneficial features of inkjet 3DP. Therefore, inkjet 3DP needs to be carefully studied and evaluated with construction goals in mind and employed in real-world applications, where it is most appropriate. This paper focuses on the important aspect of curing 3DP specimens. It discusses the enhanced mechanical properties of the mortar that are unlocked through a heat-curing process. Experiments were conducted on cubic mortar specimens that were printed and cured in an oven at a range of different temperatures (40, 60, 80, 90, 100°C). The results of the experimental tests showed that 80°C is the optimum heat-curing temperature to achieve the highest compressive strength and flexural strength of the printed mortar specimens. These tests were performed on two different dimensions of the cubic specimens, namely, 20x20x20 mm, 50x50x50 mm and on prism specimens with dimensions of 160x40x40 mm. The inkjet 3DP process and the post-processing curing are discussed. In addition, 3D scanning of the printed specimens was employed and the surface roughness profiles of the 3DP gypsum specimens and cement mortar are recorded 13.76 µm and 22.31 µm, respectively.

Shakor, P, Nejadi, S, Paul, G, Sanjayan, J & Nazari, A 2019, 'Mechanical Properties of Cement-Based Materials and Effect of Elevated Temperature on 3-D Printed Mortar Specimens in Inkjet 3-D Printing', ACI Materials Journal, vol. 116, no. 2, pp. 55-67.
View/Download from: Publisher's site
View description>>

Copyright © 2019, American Concrete Institute. All rights reserved. Three-dimensional (3-D) printers have the potential to print samples that can be used as a scaffold for a variety of applications in different industries. In this paper, cement-based materials including ordinary portland cement, calcium aluminate cement (passing 150 µm [0.0059 in.] size sieve), and fine sand were investigated as the cement-based materials in inkjet 3-D printing. Prism specimens were printed for the three-point bending test; and cubic specimens were printed for the uniaxial compressive strength test. Prism samples were printed along different directional axes (X, Y, and Z). The tests were conducted at different saturation levels (water-cement ratio [w/c]) as represented by S100C200, S125C250, S150C300, and S170C340. The prism specimens were cured in water for 7 and 28 days while cubic specimens were cured in Ca(OH) 2 and water for 7 and 28 days at the same ambient temperatures. In general, the results changed according to the directional axes of the prisms. However, following water curing, the cubic samples were heated up to 40°C (104°F) in an oven and a higher compressive strength was evident compared to the samples which were only cured in the room-temperature water. The wettability test for both powders has been conducted in the presented study.

Smith, AJ, Best, G, Yu, J & Hollinger, GA 2019, 'Real-time distributed non-myopic task selection for heterogeneous robotic teams', Autonomous Robots, vol. 43, no. 3, pp. 789-811.
View/Download from: Publisher's site

Solanes, JE, Gracia, L, Muñoz-Benavent, P, Valls Miro, J, Perez-Vidal, C & Tornero, J 2019, 'Robust Hybrid Position-Force Control for Robotic Surface Polishing', Journal of Manufacturing Science and Engineering, vol. 141, no. 1.
View/Download from: Publisher's site
View description>>

This work presents a hybrid position-force control of robots for surface polishing using task priority. The robot force control is designed using sliding mode ideas in order to benefit from its inherent robustness and low computational cost. In order to avoid the chattering drawback typically present in sliding mode control, several chattering-free controllers are evaluated and tested. A distinctive feature of the method is that the sliding mode force task is defined using not only equality constraints but also inequality constraints, which are satisfied using conventional and nonconventional sliding mode control, respectively. Moreover, a lower priority tracking controller is defined to follow the desired reference trajectory on the surface being polished. The applicability and the effectiveness of the proposed approach considering the mentioned chattering-free controllers are substantiated by experimental results using a redundant 7R manipulator.

Tang, L, Wang, Y, Ding, X, Yin, H, Xiong, R & Huang, S 2019, 'Topological local-metric framework for mobile robots navigation: a long term perspective', Autonomous Robots, vol. 43, no. 1, pp. 197-211.
View/Download from: Publisher's site
View description>>

© 2018, Springer Science+Business Media, LLC, part of Springer Nature. Long term mapping and localization are the primary components for mobile robots in real world application deployment, of which the crucial challenge is the robustness and stability. In this paper, we introduce a topological local-metric framework (TLF), aiming at dealing with environmental changes, erroneous measurements and achieving constant complexity. TLF organizes the sensor data collected by the robot in a topological graph, of which the geometry is only encoded in the edge, i.e. the relative poses between adjacent nodes, relaxing the global consistency to local consistency. Therefore the TLF is more robust to unavoidable erroneous measurements from sensor information matching since the error is constrained in the local. Based on TLF, as there is no global coordinate, we further propose the localization and navigation algorithms by switching across multiple local metric coordinates. Besides, a lifelong memorizing mechanism is presented to memorize the environmental changes in the TLF with constant complexity, as no global optimization is required. In experiments, the framework and algorithms are evaluated on 21-session data collected by stereo cameras, which are sensitive to illumination, and compared with the state-of-art global consistent framework. The results demonstrate that TLF can achieve similar localization accuracy with that from global consistent framework, but brings higher robustness with lower cost. The localization performance can also be improved from sessions because of the memorizing mechanism. Finally, equipped with TLF, the robot navigates itself in a 1 km session autonomously.

Wang, J, Song, J, Zhao, L, Huang, S & Xiong, R 2019, 'A submap joining algorithm for 3D reconstruction using an RGB-D camera based on point and plane features', Robotics and Autonomous Systems, vol. 118, pp. 93-111.
View/Download from: Publisher's site
View description>>

© 2019 Elsevier B.V. In standard point-based methods, the depth measurements of the point features suffer from noise, which will lead to incorrect global structure of the environment. This paper presents a submap joining based SLAM with an RGB-D camera by introducing planes as well as points as features.This work is consisted of two steps: submap building and submap joining. Several adjacent keyframes, with the corresponding small patches, visual feature points, and planes observed from these keyframes, are used to build a submap. We fuse the submaps into a global map in a sequential fashion, such that, the global structure is recovered gradually through plane feature associations and optimization. We also show that the proposed algorithm can handle plane association problem incrementally in submap level, as the plane covariance can be obtained in each submap. The use of submap significantly reduces the computational cost during the optimization process, while keeping all information about planes. The proposed method is validated using both publicly available RGB-D benchmarks and datasets collected by authors. The algorithm can produce accurate trajectories and high quality 3D models on these challenging datasets, which are difficult for existing RGB-D SLAM or SFM algorithms.

Wang, K, Ke, Y & Sankaran, S 2019, 'Public‐private partnerships in non‐profit hospitals: Case study of China', The International Journal of Health Planning and Management, vol. 34, no. 4, pp. e1862-e1898.
View/Download from: Publisher's site
View description>>

SummaryThe gap between supply and demand for health care services is expanding rapidly in China. In order to resolve this problem, the government has implemented supply‐side reforms in the health care sector by inviting private capital to increase supply quantity and improve quality. However, health care institutions have high complexity and particular needs, while non‐profit hospitals have very strong public interests. This gives rise to complications in the implementation of public‐private partnerships (PPPs) for health care services. In this paper, the authors have selected one case each from three different models of non‐profit hospital PPP projects in the national PPP project database, operated by the Ministry of Finance, and compared how these projects were operated to identify the differences among them. A content analysis of the vital project documents is the primary analysis technique used for this comparison. Key issues investigated include reasons for model selection, requirements for private sectors and market competition level in different models, risk identification and sharing, design of payment mechanism, operation supervision, and performance appraisal of the project. Based on the comparison, some key lessons and recommendations are discussed to act as a useful reference for future non‐profit hospital PPP projects in China.

Woolfrey, J, Lu, W & Liu, D 2019, 'A Control Method for Joint Torque Minimization of Redundant Manipulators Handling Large External Forces', Journal of Intelligent & Robotic Systems, vol. 96, no. 1, pp. 3-16.
View/Download from: Publisher's site
View description>>

© 2019, The Author(s). In this paper, a control method is developed for minimizing joint torque on a redundant manipulator where an external force acts on the end-effector. Using null space control, the redundant task is designed to minimize the torque required to oppose the external force, and reduce the dynamic torque. Furthermore, the joint motion can be weighted to factor in physical constraints such as joint limits, collision avoidance, etc. Conventional methods for joint torque minimization only consider the internal dynamics of the manipulator. If external forces acting on the end-effector are inadvertently implemented in to these control methods this could lead to joint configurations that amplify the resulting joint torque. The proposed control method is verified through two different case studies. The first case study involves simulation of high-pressure blasting. The second is a simulation of a manipulator lifting and moving a heavy object. The results show that the proposed control method reduces overall joint torque compared to conventional methods. Furthermore, the joint torque is minimized such that there is potential for a manipulator to execute certain tasks beyond its nominal payload capacity.

Woolfrey, J, Lu, W, Vidal-Calleja, T & Liu, D 2019, 'Clarifying clairvoyance: Analysis of forecasting models for near-sinusoidal periodic motion as applied to AUVs in shallow bathymetry', Ocean Engineering, vol. 190, pp. 106385-106385.
View/Download from: Publisher's site
View description>>

© 2019 Elsevier Ltd This paper shows that Gaussian Process Regression (GPR) with a periodic kernel has better mean prediction accuracy and uncertainty bounds than time series or Fourier series when forecasting motion data of underwater vehicles subject to wave excitation. Many robotic systems, such as autonomous underwater vehicles (AUVs), are required to operate in environments with disturbances and relative motion that make task performance difficult. This motion often exhibits periodic, near-sinusoidal behaviour. By predicting this motion, control strategies can be developed to improve accuracy. Moreover, factoring in uncertainty can aid the robustness of these predictive control methods. Time series and Fourier series have been applied to several predictive control problems in a variety of fields. However, there are contradictory results in performance based on parameters, assessment criteria, and application. This paper seeks to clarify these discrepancies using AUV motion as a case study. GPR is also introduced as a third candidate for prediction based on previous applications to time series forecasting in other fields of science. In addition to assessing mean prediction accuracy, the ability of each model to adequately bound prediction error is also considered as a key performance indicator.

Yang, Z, Yu, C, Kim, J, Li, Z & Wang, L 2019, 'Evolution of cooperation in synergistically evolving dynamic interdependent networks: fundamental advantages of coordinated network evolution', New Journal of Physics, vol. 21, no. 7, pp. 073057-073057.
View/Download from: Publisher's site
View description>>

Abstract Real networks are not only multi-layered yet also dynamic. The role of coordinated network evolution regarding dynamic multi-layer networks where both network and strategy evolution simultaneously show diverse interdependence by layers remains poorly addressed. Here, we propose a general and simple coevolution framework to analyze how coordination of different dynamical processes affects strategy propagation in synergistically evolving interdependent networks. The strategic feedback constitutes the main driving force of network evolution yet the inherent cross-layer self-optimization functions as its compensation. We show that these two ingredients often catalyze a better performance of network evolution in propagating cooperation. Coordinated network evolution may be a double-edged sword to cooperation and the network-adapting rate plays a crucial role in flipping its double-sided effect. It often economizes the cost and time consumption for driving the system to the full cooperation phase. Importantly, strongly coupled slow-tuned networks can outperform weakly coupled fast-regulated networks in solving social dilemmas, highlighting the fundamental advantages of coordinated network evolution and the importance of synergistic effect of dynamical processes in upholding human cooperation in multiplex networks.

Yu, H, Lu, W, Liu, D, Han, Y & Wu, Q 2019, 'Speeding up Gaussian Belief Space Planning for Underwater Robots Through a Covariance Upper Bound', IEEE Access, vol. 7, pp. 121961-121974.
View/Download from: Publisher's site

Zhan, J, Ge, XJ, Huang, S, Zhao, L, Wong, JKW & He, SX 2019, 'Improvement of the inspection-repair process with building information modelling and image classification', Facilities, vol. 37, no. 7/8, pp. 395-414.
View/Download from: Publisher's site
View description>>

PurposeAutomated technologies have been applied to facility management (FM) practices to address labour demands of, and time consumed by, inputting and processing manual data. Less attention has been focussed on automation of visual information, such as images, when improving timely maintenance decisions. This study aims to develop image classification algorithms to improve information flow in the inspection-repair process through building information modelling (BIM).Design/methodology/approachTo improve and automate the inspection-repair process, image classification algorithms were used to connect images with a corresponding image database in a BIM knowledge repository. Quick response (QR) code decoding and Bag of Words were chosen to classify images in the system. Graphical user interfaces (GUIs) were developed to facilitate activity collaboration and communication. A pilot case study in an inspection-repair process was applied to demonstrate the applications of this system.FindingsThe system developed in this study associates the inspection-repair process with a digital three-dimensional (3D) model, GUIs, a BIM knowledge repository and image classification algorithms. By implementing the proposed application in a case study, the authors found that improvement of the inspection-repair process and automated image classification with a BIM knowledge repository (such as the one developed in this study) can enhance FM practices by increasing productivity and reducing time and costs associated with ecision-making.Originality/valueThis study introduces an innovative approach th...

Zhao, J, Huang, S, Zhao, L, Chen, Y & Luo, X 2019, 'Conic Feature Based Simultaneous Localization and Mapping in Open Environment via 2D Lidar', IEEE Access, vol. 7, pp. 173703-173718.
View/Download from: Publisher's site
View description>>

© 2013 IEEE. The conventional planar scan matching approach cannot cope well with the open environment as lacking of sufficient edges and corners. This paper presents a conic feature based simultaneous localization and mapping (SLAM) algorithm via 2D lidar which can adapt to an open environment nicely. The novelty of this work includes threefold: (1) defining a conic feature based parametrization approach; (2) developing a method to utilize feature's conic geometric information and odometry information since open environments are short of regular linear geometric features; (3) developing a factor graph based framework which can be adapted with the proposed parametrization. Simulation experiments and real environment experiments demonstrated that the proposed SLAM algorithm can get accurate and convincing results for the open environment and the map in our representation can express accurately the environment situation.

Zhao, L, Huang, S & Dissanayake, G 2019, 'Linear SLAM: Linearising the SLAM problems using submap joining', Automatica, vol. 100, pp. 231-246.
View/Download from: Publisher's site
View description>>

© 2018 Elsevier Ltd The main contribution of this paper is a new submap joining based approach for solving large-scale Simultaneous Localization and Mapping (SLAM) problems. Each local submap is independently built using the local information through solving a small-scale SLAM; the joining of submaps mainly involves solving linear least squares and performing nonlinear coordinate transformations. Through approximating the local submap information as the state estimate and its corresponding information matrix, judiciously selecting the submap coordinate frames, and approximating the joining of a large number of submaps by joining only two maps at a time, either sequentially or in a more efficient Divide and Conquer manner, the nonlinear optimization process involved in most of the existing submap joining approaches is avoided. Thus the proposed submap joining algorithm does not require initial guess or iterations since linear least squares problems have closed-form solutions. The proposed Linear SLAM technique is applicable to feature-based SLAM, pose graph SLAM and D-SLAM, in both two and three dimensions, and does not require any assumption on the character of the covariance matrices. Simulations and experiments are performed to evaluate the proposed Linear SLAM algorithm. Results using publicly available datasets in 2D and 3D show that Linear SLAM produces results that are very close to the best solutions that can be obtained using full nonlinear optimization algorithm started from an accurate initial guess. The C/C++ and MATLAB source codes of Linear SLAM are available on OpenSLAM.

Aldini, S, Akella, A, Singh, AK, Wang, Y-K, Carmichael, M, Liu, D & Lin, C-T 1970, 'Effect of Mechanical Resistance on Cognitive Conflict in Physical Human-Robot Collaboration', 2019 International Conference on Robotics and Automation (ICRA), 2019 International Conference on Robotics and Automation (ICRA), IEEE, Canada, pp. 6137-6143.
View/Download from: Publisher's site
View description>>

© 2019 IEEE. Physical Human-Robot Collaboration (pHRC) is about the interaction between one or more human operator(s) and one or more robot(s) in direct contact and voluntarily exchanging forces to accomplish a common task. In any pHRC, the intuitiveness of the interaction has always been a priority, so that the operator can comfortably and safely interact with the robot. So far, the intuitiveness has always been described in a qualitative way. In this paper, we suggest an objective way to evaluate intuitiveness, known as prediction error negativity (PEN) using electroencephalogram (EEG). PEN is defined as a negative deflection in event related potential (ERP) due to cognitive conflict, as a consequence of a mismatch between perception and reality. Experimental results showed that the forces exchanged between robot and human during pHRC modulate the amplitude of PEN, representing different levels of cognitive conflict. We also found that PEN amplitude significantly decreases (mathrm {p} lt 0.05) when a mechanical resistance is being applied smoothly and more time in advance before an invisible obstacle, when compared to a scenario in which the resistance is applied abruptly before the obstacle. These results indicate that an earlier and smoother resistance reduces the conflict level. Consequently, this suggests that smoother changes in resistance make the interaction more intuitive.

Arukgoda, J, Ranasinghe, R & Dissanayake, G 1970, 'Representation of Uncertain Occupancy Maps with High Level Feature Vectors', 2019 IEEE 15th International Conference on Automation Science and Engineering (CASE), 2019 IEEE 15th International Conference on Automation Science and Engineering (CASE), IEEE, Vancouver, BC, Canada, pp. 1035-1041.
View/Download from: Publisher's site
View description>>

© 2019 IEEE. This paper presents a novel method for representing an uncertain occupancy map using a 'feature vector' and an associated covariance matrix. Input required is a point cloud generated using observations from a sensor captured at different locations in the environment. Both the sensor locations and the measurements themselves may have an associated uncertainty. The output is a set of coefficients and their uncertainties of a cubic spline approximation to the distance function of the environment, thereby resulting in a compact parametric representation of the environment geometry. Cubic spline coefficients are computed by solving a non-linear least squares problem that enforces the Eikonal equation over the space in which the environment geometry is defined, and zero boundary condition at each observation in the point cloud. It is argued that a feature based representation of point cloud maps acquired from uncertain locations using noisy sensors has the potential to open up a new direction in robot mapping, localisation and SLAM. Numerical examples are presented to illustrate the proposed technique.

Arukgoda, J, Ranasinghe, R & Dissanayake, G 1970, 'Robot Localisation in 3D Environments Using Sparse Range Measurements', 2019 IEEE/ASME International Conference on Advanced Intelligent Mechatronics (AIM), 2019 IEEE/ASME International Conference on Advanced Intelligent Mechatronics (AIM), IEEE, Hong Kong, pp. 551-558.
View/Download from: Publisher's site
View description>>

© 2019 IEEE. This paper presents an algorithm for mobile robot localisation given a map of a 3D environment and a sparse set of range-bearing measurements. The environment is represented using a spline approximation of its vector distance function (VDF). For a given location in the environment, VDF encodes the distance to the nearest occupied region along three orthogonal axes. VDF is first obtained from an occupancy voxel map and its three components are then approximated in the least-square sense using a set of three dimensional cubic b-splines, providing a rich and continuous representation of the environment. First and second order derivatives of the VDF are also computed and stored. The difference between an observed range measurement in a given direction and its expected value is formulated as a function of the robot location and the spline coefficients representing the VDF. This leads to a non-linear least-squares optimization problem that can be solved to localise the robot given a set of such measurements. It is demonstrated that a sparse set of range-bearing measurements, an order of magnitude smaller than what is typically available from 3D range sensor is adequate to achieve accurate localisation. The algorithm presented is illustrated using a number of examples including a single point range sensor mounted on a pan-tilt head to localise a robot moving in an indoor environment.

Best, G & Hollinger, GA 1970, 'Decentralised self-organising maps for the online orienteering problem with neighbourhoods', 2019 International Symposium on Multi-Robot and Multi-Agent Systems (MRS), 2019 International Symposium on Multi-Robot and Multi-Agent Systems (MRS), IEEE, pp. 139-141.
View/Download from: Publisher's site

Carmichael, MG, Aldini, S, Khonasty, R, Tran, A, Reeks, C, Liu, D, Waldron, KJ & Dissanayake, G 1970, 'The ANBOT: An Intelligent Robotic Co-worker for Industrial Abrasive Blasting', 2019 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS), 2019 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS), IEEE, Macau, China, pp. 8026-8033.
View/Download from: Publisher's site
View description>>

© 2019 IEEE. We present the ANBOT, an intelligent robotic coworker for physical human-robot collaboration. The ANBOT system assists workers performing industrial abrasive blasting, shielding them from the large forces experienced during this physically demanding task. The co-operative robotic system combines the strength and endurance of robots with the decision making of skilled workers. The inherent challenges in human-robot collaboration, combined with the difficult blasting environment required novel design decisions to be made and new solutions to be developed. These include an approach for handling kinematic singularities in a manner suitable for human-robot co-operation, estimating worker pose under poor visibility conditions, and an intuitive control scheme that adapts the robotic assistance based on the estimated strength of the worker. In this work we summarise the ANBOT system and present findings from preliminary site trials. The trials included several real industrial blasting tasks under the control of a skilled abrasive blasting worker who had no experience working alongside a robot. Results demonstrate the suitability of the ANBOT for practical industrial applications.

Chen, Y, Huang, S, Fitch, R, Zhao, L, Yu, H & Yang, D 1970, 'On-line 3D active pose-graph SLAM based on key poses using graph topology and sub-maps', 2019 International Conference on Robotics and Automation (ICRA), 2019 International Conference on Robotics and Automation (ICRA), IEEE, Montreal, CANADA, pp. 169-175.
View/Download from: Publisher's site
View description>>

© 2019 IEEE. In this paper, we present an on-line active pose-graph simultaneous localization and mapping (SLAM) frame-work for robots in three-dimensional (3D) environments using graph topology and sub-maps. This framework aims to find the best trajectory for loop-closure by re-visiting old poses based on the T-optimality and D-optimality metrics of the Fisher information matrix (FIM) in pose-graph SLAM. In order to reduce computational complexity, graph topologies are introduced, including weighted node degree (T-optimality metric) and weighted tree-connectivity (D-optimality metric), to choose a candidate trajectory and several key poses. With the help of the key poses, a sampling-based path planning method and a continuous-time trajectory optimization method are combined hierarchically and applied in the whole framework. So as to further improve the real-time capability of the method, the sub-map joining method is used in the estimation and planning process for large-scale active SLAM problems. In simulations and experiments, we validate our approach by comparing against existing methods, and we demonstrate the on-line planning part using a quad-rotor unmanned aerial vehicle (UAV).

Fitch, R, Katupitiya, J & Whitty, M 1970, 'FOREWORD', IFAC PAPERSONLINE, 6th International-Federation-of-Automatic-Control (IFAC) Conference on Sensing, Control and Automation Technologies for Agriculture (AGRICONTROL), ELSEVIER, AUSTRALIA, Sydney, pp. VI-VI.

Fryc, S, Liu, L & Vidal Calleja, T 1970, 'Efficient Pipeline for Mobile Brick Picking', Australasian Conference on Robotics and Automation, ACRA, Australasian Conference on Robotics and Automation, ARAA, Adelaide, pp. 1-8.
View description>>

Autonomous mobile manipulation is gaining more and more attention for a range of application including disaster response, logistics, manufacturing and construction because removes work space limitation and allows object handling. A key challenge in mobile manipulation is the interaction between motion planning and perception that will deliver stable and efficient solutions. In this work, we are interested in the problem of picking a single brick shaped object from an unstructured pile using a mo- bile manipulator and a 3D camera system. We propose a robust multi-stage pipeline for a efficient, collision-free brick picking given the object pose. The key contribution of this work is a scoring function used to find the most suitable configuration considering the integrated kinematic chain of mobile base and manipulator arm. Realistic simulation results show the proposed pipeline has 100% success rate as opposed to a standard off-the-shelf solution, which has high-failure rates.

Fryc, S, Liu, L & Vidal-Calleja, T 1970, 'Robust pipeline for mobile brick picking', Australasian Conference on Robotics and Automation, ACRA.
View description>>

In this work, we are interested in the problem of picking a single brick shaped object from an unstructured pile using a mobile manipulator and a 3D camera system. We propose a robust multi-stage pipeline for efficient, collision-free brick picking given the pose of a target object. The key contribution of this work is a scoring function used to find the most suitable configuration considering the integrated kinematic chain of a mobile base and manipulator arm. Realistic simulation results show the proposed pipeline has 100% success rate as opposed to a standard off-the-shelf solution, which has high-failure rates.

Galea, M & Vidal-Calleja, T 1970, 'Point cloud edge detection and template matching with 1D gradient descent for wall pose estimation', Australasian Conference on Robotics and Automation, ACRA, Australasian Conference on Robotics and Automation, ARAA, Adelaide, Australia, pp. 1-10.
View description>>

Mobile manipulation in unstructured construction environments involves a range of complex robotic problems. We address a perception requirement for autonomous brick placement; estimating the pose of a partially built wall to facilitate the placement of the subsequent brick. Our method uses RGB-D data to extract the surface edge points of the wall and classify them as horizontally or vertically aligned. The contribution of this paper encompasses a wall template that encapsulates its surface edge features and a novel 1D gradient descent template matching algorithm for pose estimation. We apply our method in mobile manipulator brick placement, demonstrating its robotic applications. Evaluation methods prove the efficacy of the proposed framework, both quantitatively and qualitatively and using both simulated and real data.

Gentil, CL, Vidal-Calleja, T & Huang, S 1970, 'IN2LAMA: INertial Lidar Localisation And MApping', 2019 International Conference on Robotics and Automation (ICRA), 2019 International Conference on Robotics and Automation (ICRA), IEEE, Montreal, pp. 6388-6394.
View/Download from: Publisher's site
View description>>

© 2019 IEEE. In this paper, we introduce a probabilistic framework for INertial Lidar Localisation And MApping (IN2LAMA). Most of today's lidars are based on spinning mechanisms that do not capture snapshots of the environment. As a result, movement of the sensor can occur while scanning. Without a good estimation of this motion, the resulting point clouds might be distorted. In the lidar mapping literature, a constant velocity motion model is commonly assumed. This is an approximation that does not necessarily always hold. The key idea of the proposed framework is to exploit preintegrated measurements over upsampled inertial data to handle motion distortion without the need for any explicit motion-model. It tightly integrates inertial and lidar data in a batch on-manifold optimisation formulation. Using temporally precise upsampled preintegrated measurement allows frame-to-frame planar and edge features association. Moreover, features are re-computed when the estimate of the state changes, consolidating front-end and back-end interaction. We validate the effectiveness of the approach through simulated and real data.

Giovanangeli, N, Piyathilaka, L, Kodagoda, S, Thiyagarajan, K, Barclay, S & Vitanage, D 1970, 'Design and Development of Drill-Resistance Sensor Technology for Accurately Measuring Microbiologically Corroded Concrete Depths', Proceedings of the International Symposium on Automation and Robotics in Construction (IAARC), 36th International Symposium on Automation and Robotics in Construction, International Association for Automation and Robotics in Construction (IAARC), Canada, pp. 735-735.
View/Download from: Publisher's site
View description>>

© 2019 International Association for Automation and Robotics in Construction I.A.A.R.C. All rights reserved. Microbial corrosion of concrete is a severe problem that significantly reduces the service life of underground sewers in countries around the globe. Therefore, water utilities are actively looking for in-situ sensors that can quantify the biologically induced concrete corrosion levels, in order to carry out preventive maintenance before any catastrophic failures. As a solution, this paper introduces a drill-resistance based sensor that can accurately measure the depth of the microbiologically corroded concrete layer. A prototype sensor was developed and evaluated in laboratory test conditions. The lab experiments proved that the developed sensor has the ability to measure the depth of the microbiologically corroded concrete with millimeter level of accuracy. Additionally, the sensor can also locate and accurately measure the size of concrete aggregates as well as potential cracks, effectively creating a sub-surface ‘scan’ of the concrete at the targeted point of interest. Therefore, providing valuable extra information for assessing the condition of the sewer concrete.

Gunatilake, A, Piyathilaka, L, Kodagoda, S, Barclay, S & Vitanage, D 1970, 'Real-Time 3D Profiling with RGB-D Mapping in Pipelines Using Stereo Camera Vision and Structured IR Laser Ring', Proceedings of the 14th IEEE Conference on Industrial Electronics and Applications, ICIEA 2019, IEEE Conference on Industrial Electronics and Applications, IEEE, Xi'an, China, pp. 916-921.
View/Download from: Publisher's site
View description>>

This paper is focused on delivering a solution that can scan and reconstructthe 3D profile of a pipeline in real-time using a crawler robot. A structuredinfrared (IR) laser ring projector and a stereo camera system are used togenerate the 3D profile of the pipe as the robot moves inside the pipe. Theproposed stereo system does not require field calibrations and it is notaffected by the lateral movement of the robot, hence capable of producing anaccurate 3D map. The wavelength of the IR light source is chosen to be nonoverlapping with the visible spectrum of the color camera. Hence RGB colorvalues of the depth can be obtained by projecting the 3D map into the colorimage frame. The proposed system is implemented in Robotic Operating System(ROS) producing real-time RGB-D maps with defects. The defect map exploitdifferences in ovality enabling real-time identification of structural defectssuch as surface corrosion in pipe infrastructure. The lab experiments showedthe proposed laser profiling system can detect ovality changes of the pipe withmillimeter level of accuracy and resolution.

Hadgraft, R, Francis, B, Brown, T, Fitch, R & Halkon, B 1970, 'Renewing Mechanical and Mechatronics Programs', AAEE2019, AAEE2019, Brisbane, Australia.

Huang, S, Lu, W, Zhou, Y, Yu, S, Zhang, Y, Shi, X & Chen, Z 1970, 'An Automatic Slope-Calibrated Ramp Generator for Single-Slope ADCs', 2019 IEEE 13th International Conference on ASIC (ASICON), 2019 IEEE 13th International Conference on ASIC (ASICON), IEEE, PEOPLES R CHINA, Chongqing, pp. 1-4.
View/Download from: Publisher's site

Hyun, J-S, Carmichael, MG, Tran, A, Zhang, S & Liu, D 1970, 'Evaluation of Fast, High-detail Projected Light 3D Sensing for Robots in Construction', 2019 14th IEEE Conference on Industrial Electronics and Applications (ICIEA), 2019 14th IEEE Conference on Industrial Electronics and Applications (ICIEA), IEEE, Xi'an, China, pp. 1262-1267.
View/Download from: Publisher's site
View description>>

© 2019 IEEE. Robots used on-site in construction need to perceive the surrounding environment to operate autonomously. This is challenging as the construction environment is often less than ideal due to changing lighting conditions, turbid air, and the need to detect fine details. In this work we evaluate a custom made projected light 3D sensor system for suitability and practicality in enabling autonomous robotics for construction. A series of tests are performed to evaluate the sensor based on ability to capture environmental details, operate robustly in challenging lighting conditions, and make accurate geometric measurements. Analysis shows that high fidelity measurements with accuracy in the order of millimeters can be obtained, making the technology a promising solution for robots operating in construction environments.

Jayasuriya, M, Dissanayake, G, Ranasinghe, R & Gandhi, N 1970, 'Leveraging Deep Learning Based Object Detection for Localising Autonomous Personal Mobility Devices in Sparse Maps.', ITSC, IEEE Intelligent Transportation Systems Conference, IEEE, Auckland, New Zealand, pp. 4081-4086.
View/Download from: Publisher's site
View description>>

© 2019 IEEE. This paper presents a low cost, resource efficient localisation approach for autonomous driving in GPS denied environments. One of the most challenging aspects of traditional landmark based localisation in the context of autonomous driving, is the necessity to accurately and frequently detect landmarks. We leverage the state of the art deep learning framework, YOLO (You Only Look Once), to carry out this important perceptual task using data obtained from monocular cameras. Extracted bearing only information from the YOLO framework, and vehicle odometry, is fused using an Extended Kalman Filter (EKF) to generate an estimate of the location of the autonomous vehicle, together with it's associated uncertainty. This approach enables us to achieve real-time sub metre localisation accuracy, using only a sparse map of an outdoor urban environment. The broader motivation of this research is to improve the safety and reliability of Personal Mobility Devices (PMDs) through autonomous technology. Thus, all the ideas presented here are demonstrated using an instrumented mobility scooter platform.

Killen, C, Sankaran, S, Knapp, M & Stevens, C 1970, 'Governance of innovation through projects: ambidexterity and integration mechanisms', European Academy of Management, European Academy of Management, Lisbon.

Lai, Y, Sutjipto, S, Carmichael, M & Paul, G 1970, 'Heuristic Detection of Recovery Progress using Robotic Data', 2019 IEEE International Conference on Cybernetics and Intelligent Systems (CIS) and IEEE Conference on Robotics, Automation and Mechatronics (RAM), 2019 IEEE International Conference on Cybernetics and Intelligent Systems (CIS) and IEEE Conference on Robotics, Automation and Mechatronics (RAM), IEEE, Bangkok, Thailand, pp. 506-511.
View/Download from: Publisher's site
View description>>

Assessment methods for rehabilitation and recovery have recently been the focal point of research for medical professionals and engineers alike. Current assessment protocols rely on historical ordinal metrics which have been disputed despite their inter-rater reliability. Contemporary kinematic measures have allowed for new approaches to assess recovery progress. However, the abundance of data has deterred medical professionals from adopting these new protocols. This paper presents a method, based on the RMSE-LWSS (Longest Warping Subsequence) score, to distinguish outliers from systemic change for updating the personalized exercise path for users. By treating change detection as a classification problem, the incorporation of a compromised path based on the user's current capability is possible. Experiments were conducted to verify the efficacy of the method, comparing against statistical techniques for change detection and classification of pre-determined paths. The paper highlights how readily available data, rather than complex sensor systems, can be utilized to improve the robustness of personalization capabilities for robotic rehabilitation systems.

Lamsam, L, Zhang, M, Carmichael, M, Bhambvani, H, Connolly, ID, Hernandez-Boussard, T, Veeravagu, A & Ratliff, JK 1970, 'Impact of Centers for Medicare and Medicaid Services Non-Reimbursement on Hospital-Acquired Conditions Following Spine Procedures', NEUROSURGERY, Annual Meeting of the Congress-of-Neurological-Surgeons, OXFORD UNIV PRESS INC, CA, San Francisco, pp. 27-27.

Lee, KMB, Yoo, C, Hollings, B, Anstee, S, Huang, S & Fitch, R 1970, 'Online Estimation of Ocean Current from Sparse GPS Data for Underwater Vehicles', Proceedings - IEEE International Conference on Robotics and Automation, International Conference on Robotics and Automation (ICRA), IEEE, Montreal, CANADA, pp. 3443-3449.
View/Download from: Publisher's site
View description>>

Underwater robots are subject to position drift due to the effect of oceancurrents and the lack of accurate localisation while submerged. We areinterested in exploiting such position drift to estimate the ocean current inthe surrounding area, thereby assisting navigation and planning. We present aGaussian process~(GP)-based expectation-maximisation~(EM) algorithm thatestimates the underlying ocean current using sparse GPS data obtained on thesurface and dead-reckoned position estimates. We first develop a specialised GPregression scheme that exploits the incompressibility of ocean currents tocounteract the underdetermined nature of the problem. We then use the proposedregression scheme in an EM algorithm that estimates the best-fitting oceancurrent in between each GPS fix. The proposed algorithm is validated insimulation and on a real dataset, and is shown to be capable of reconstructingthe underlying ocean current field. We expect to use this algorithm to closethe loop between planning and estimation for underwater navigation in unknownocean currents.

Li, Z, Hong, J, Kim, J & Yu, C 1970, 'Control Design and Analysis of An Epidemic SEIV Model upon Adaptive Network', 2019 18th European Control Conference (ECC), 2019 18th European Control Conference (ECC), IEEE, Naples, Italy.
View/Download from: Publisher's site
View description>>

This paper focuses on the control design and stability analysis of a Susceptible-Exposed-Infected-Vigilant (SEIV) epidemic model via adaptive complex networks. The network is designed empirically as a state-dependent network, where the network structure keeps changing to inhibit the epidemic propagation. The recovery rate and the disease prevention rate are chosen as the control scheme in the epidemic system, both of which are closely associated with medical resources allocation. People may cut the connection with an infected neighbor and reduce the frequency to go out when an epidemic occurs. In order to formulate this behavior, an adaptive network structure is presented which is designed to be consistent with real human contact behaviors under epidemic prevalence. A candidate Lyapunov function is employed to analyze the system stability and guarantee the extinction of the epidemic. Simulation results are shown to illustrate the high efficiency and validity of the parameter control and the adaptive network design.

Li, Z, Hong, J, Kim, J & Yu, C 1970, 'Control Design and Stability Analysis of a Two-Infectious-State Awareness Epidemic Model', 2019 12th Asian Control Conference, ASCC 2019, Asian Control Conference, IEEE, Kitakyushu-shi, Japan, pp. 704-709.
View description>>

This paper focuses on the control design and stability analysis of an awareness Susceptible-Exposed-Infected-Vigilant (SEIV) epidemic system which has two infectious states over arbitrary directed networks. A state feedback controller is firstly applied to the generalized SEIV model with human awareness, and explores the medical treatment usage against the epidemic propagation. After applying the control scheme into the epidemic system, the epidemic threshold condition is found to guarantee the exponential stability of the system. Simulation results are illustrated to verify the threshold condition as well as the performance of the control design which is able to reduce the epidemic outbreak and effectively inhibiting the epidemic dissemination.

Munasinghe, N, Miles, L & Paul, G 1970, 'Direct-Write Fabrication of Wear Profiling IoT Sensor for 3D Printed Industrial Equipment', Proceedings of the International Symposium on Automation and Robotics in Construction (IAARC), 36th International Symposium on Automation and Robotics in Construction, International Association for Automation and Robotics in Construction (IAARC), Banff, Canada, pp. 862-869.
View/Download from: Publisher's site
View description>>

© 2019 International Association for Automation and Robotics in Construction I.A.A.R.C. All rights reserved. Additive Manufacturing (AM), also known as 3D printing, is an emerging technology, not only as a prototyping technology, but also to manufacture complete products. Gravity Separation Spirals (GSS) are used in the mining industry to separate slurry into different density components. Currently, spirals are manufactured using moulded polyurethane on fibreglass substructure, or injection moulding. These methods incur significant tooling cost and lead times making them difficult to customise, and they are labour-intensive and can expose workers to hazardous materials. Thus, a 3D printer is under development that can print spirals directly, enabling mass customisation. Furthermore, sensors can be embedded into spirals to measure the operational conditions for predictive maintenance, and to collect data that can improve future manufacturing processes. The localisation of abrasive wear in the GSS is an essential factor in optimising parameters such as suitable material, print thickness, and infill density and thus extend the lifetime and performance of future manufactured spirals. This paper presents the details of a wear sensor, which can be 3D printed directly into the spiral using conductive material. Experimental results show that the sensor can both measure the amount of wear and identify the location of the wear in both the horizontal and vertical axes. Additionally, it is shown that the accuracy can be adjusted according to the requirements by changing the number and spacing of wear lines.

Munasinghe, N, Woods, M, Miles, L & Paul, G 1970, '3-D Printed Strain Sensor for Structural Health Monitoring', 2019 IEEE International Conference on Cybernetics and Intelligent Systems (CIS) and IEEE Conference on Robotics, Automation and Mechatronics (RAM), 2019 IEEE International Conference on Cybernetics and Intelligent Systems (CIS) and IEEE Conference on Robotics, Automation and Mechatronics (RAM), IEEE, Bangkok, pp. 275-280.
View/Download from: Publisher's site
View description>>

Additive manufacturing, or 3D printing, is evolving from a technology that can only aid rapid prototyping, to one that can be used to directly manufacture large-scale, real-world equipment. Gravity Separation Spirals (GSS) are vital to the mining industry for separating mineral-rich slurry into its different density components. In order to overcome inherent drawbacks of the traditional mould base manufacturing methods, including significant tooling costs, limited customisation and worker exposure to hazardous materials, a 3D printer is under development to directly print spirals. By embedding small Internet of Things (IoT) sensors inside the GSS, it is possible to remotely determine the operation conditions, predict faults, and use collected data to optimise production output. This work presents a 3D printed strain sensor, which can be directly printed into the GSS. This approach uses a carbon-based conductive filament to print a strain gauge on top of a Polylactic Acid (PLA) base material. Printed sensors have been tested using an Instron E10000 testing machine with an optical extensometer to improve accuracy. Testing was conducted by both loading and unloading conditions to understand the effect of hysteresis. Test results show a near-linear relationship between strain and measured resistance, and show a 6.05% increase in resistance after the test, which indicates minor hysteresis. Moreover, the impact of viscoelastic behaviour is identified, where the resistance response lags the strain. Results from both conductive and non-conductive material show the impact of the conductive carbon upon the tensile strength, which will help to inform future decisions about sensor placement.

Nguyen, L & Miro, JV 1970, 'Acoustic Sensor Networks and Mobile Robotics for Sound Source Localization', 2019 IEEE 15th International Conference on Control and Automation (ICCA), 2019 IEEE 15th International Conference on Control and Automation (ICCA), IEEE, Edinburgh, UK, pp. 1453-1458.
View/Download from: Publisher's site
View description>>

© 2019 IEEE. Localizing a sound source is a fundamental but still challenging issue in many applications, where sound information is gathered by static and local microphone sensors. Therefore, this work proposes a new system by exploiting advances in sensor networks and robotics to more accurately address the problem of sound source localization. By the use of the network infrastructure, acoustic sensors are more efficient to spatially monitor acoustical phenomena. Furthermore, a mobile robot is proposed to carry an extra microphone array in order to collect more acoustic signals when it travels around the environment. Driving the robot is guided by the need to increase the quality of the data gathered by the static acoustic sensors, which leads to better probabilistic fusion of all the information gained, so that an increasingly accurate map of the sound source can be built. The proposed system has been validated in a real-life environment, where the obtained results are highly promising.

Nguyen, L, Miro, JV & Qiu, X 1970, 'Can a Robot Hear the Shape and Dimensions of a Room?', IEEE International Conference on Intelligent Robots and Systems, IEEE/RSJ International Conference on Intelligent Robots and Systems, IEEE, Macau, China, pp. 5346-5351.
View/Download from: Publisher's site
View description>>

Knowing the geometry of a space is desirable for many applications, e.g.sound source localization, sound field reproduction or auralization. Incircumstances where only acoustic signals can be obtained, estimating thegeometry of a room is a challenging proposition. Existing methods have beenproposed to reconstruct a room from the room impulse responses (RIRs). However,the sound source and microphones must be deployed in a feasible region of theroom for it to work, which is impractical when the room is unknown. This workpropose to employ a robot equipped with a sound source and four acousticsensors, to follow a proposed path planning strategy to moves around the roomto collect first image sources for room geometry estimation. The strategy caneffectively drives the robot from a random initial location through the room sothat the room geometry is guaranteed to be revealed. Effectiveness of theproposed approach is extensively validated in a synthetic environment, wherethe results obtained are highly promising.

Nguyen, L, Miro, JV, Shi, L & Vidal-Calleja, T 1970, 'Gaussian Mixture Marginal Distributions for Modelling Remaining Pipe Wall Thickness of Critical Water Mains in Non-Destructive Evaluation', 2019 IEEE International Conference on Cybernetics and Intelligent Systems (CIS) and IEEE Conference on Robotics, Automation and Mechatronics (RAM), IEEE International Conference on Cybernetics and Intelligent Systems, and Robotics, Automation and Mechatronics, IEEE, Bangkok, Thailand.
View/Download from: Publisher's site
View description>>

Rapidly estimating the remaining wall thickness (RWT) is paramount for thenon-destructive condition assessment evaluation of large critical metallicpipelines. A robotic vehicle with embedded magnetism-based sensors has beendeveloped to traverse the inside of a pipeline and conduct inspections at thelocation of a break. However its sensing speed is constrained by the magneticprinciple of operation, thus slowing down the overall operation in seekingdense RWT mapping. To ameliorate this drawback, this work proposes the partialscanning of the pipe and then employing Gaussian Processes (GPs) to infer RWTat the unseen pipe sections. Since GP prediction assumes to have normallydistributed input data - which does correspond with real RWT measurements -Gaussian mixture (GM) models are proven in this work as fitting marginaldistributions to effectively capture the probability of any RWT value in theinspected data. The effectiveness of the proposed approach is extensivelyvalidated from real-world data collected in collaboration with a water utilityfrom a cast iron water main pipeline in Sydney, Australia.

Piyathilaka, L, Sooriyaarachchi, B, Kodagoda, S & Thiyagarajan, K 1970, 'Capacitive Sensor Based 2D Subsurface Imaging Technology for Non Destructive Evaluation of Building Surfaces', PROCEEDINGS OF THE IEEE 2019 9TH INTERNATIONAL CONFERENCE ON CYBERNETICS AND INTELLIGENT SYSTEMS (CIS) ROBOTICS, AUTOMATION AND MECHATRONICS (RAM) (CIS & RAM 2019), 9th IEEE International Conference on Cybernetics and Intelligent Systems (CIS) / IEEE Conference on Robotics, Automation and Mechatronics (RAM), IEEE, Bangkok, THAILAND, pp. 287-292.
View description>>

Understanding the underlying structure of building surfaces like walls andfloors is essential when carrying out building maintenance and modificationwork. To facilitate such work, this paper introduces a capacitive sensor-basedtechnology which can conduct non-destructive evaluation of building surfaces.The novelty of this sensor is that it can generate a real-time 2D subsurfaceimage which can be used to understand structure beneath the top surface. FiniteElement Analysis (FEA) simulations are done to understand the best sensor headconfiguration that gives optimum results. Hardware and software components arecustom-built to facilitate real-time imaging capability. The sensor isvalidated by laboratory tests, which revealed the ability of the proposedcapacitive sensing technology to see through common building materials likewood and concrete. The 2D image generated by the sensor is found to be usefulin understanding the subsurface structure beneath the top surface.

Pshtiwan Shakor, Shami Nejadi & Gavin Paul 1970, 'An Investigation into the Effects of Deposition Orientation of Material on the Mechanical Behaviours of the Cementitious Powder and Gypsum Powder in Inkjet 3D Printing', Proceedings of the International Symposium on Automation and Robotics in Construction (IAARC), 36th International Symposium on Automation and Robotics in Construction, International Association for Automation and Robotics in Construction (IAARC), Banff, AB, Canada, pp. 42-49.
View/Download from: Publisher's site
View description>>

© 2019 International Association for Automation and Robotics in Construction I.A.A.R.C. All rights reserved. Three-Dimensional Printing (3DP) is widely used and continues to be rapidly developed and adopted, in several industries, including construction industry. Inkjet 3DP is the approach which offers the most promising and immediate opportunities for integrating the benefits of additive manufacturing technic into the construction field. The ability to readily modify the orientation angle that the printed material is deposited is one of the most advantageous features in a 3DP scaffold compared with conventional methods. The orientation angle has a significant effect on the mechanical behaviours of the printed specimens. Therefore, this paper focuses on printing in different orientations somehow to compare various mechanical properties and to characterise a selection of common construction materials including gypsum (ZP 151) and cement mortar (CP). The optimum strength for the gypsum specimens in compression and flexural strength was observed in the (0° and 90°) and (0°) in the X-Z plane, respectively. According to the experimental results, the compression and flexural strength for ZP 151 are recorded at (11.59±1.18 and 11.78±1.19) MPa and 15.57±0.71 MPa, respectively. Conversely, the highest strength in compression and flexural strength are observed in the (90°) and (0°) degrees in the X-Z plane for the cement mortar, respectively. Moreover, it has been discovered that the compression and flexural strengths for CP are recorded as 19.44±0.11 MPa and 4.06±0.08 MPa, respectively. In addition, the dimensional effect for various w/c ratio has been monitored and examined.

Sankaran, S, Ke, Y, Mangioni, V & Devkar, G 1970, 'Responsible Leadership of Public Private Partnerships (PPP) Adopted in Infrastructure Projects', PROJECT MANAGEMENT IN THE EMERGING WORLD OF DISRUPTION, PMI India Research & Academic Conference, Project Management Institute, IIMK, Kozhikode, India, pp. 196-215.
View description>>

Increased attention has been paid to the leadership role of a project manager in the project management literature since 2000 covering transactional, transformational, servant, distributed, authentic and balanced leadership (Müller et al. 2018). Waldman and Gavin (2008)have observed that the leadership descriptors in the general leadership literature do not cover a leader’s responsibility. While a project manager’s responsibility is defined in practice, research in responsible leadership in projects is only just beginning to emerge (Clarke 2018).Pless (2007) defines responsible leadership as ‘a social and moral phenomenon that was pushed onto the agenda not only by recent scandals and the pressing issues that affect life on our planet, but also by the realization that multinational corporations and their leaders have an enormous potential for contributing to the betterment of the world’.Failures such as the collapse of BHP Billiton’s Samarco dam in Brazil can severely affect the organization’s reputation. Projects also deliver benefits to society. Therefore, what is good for MNCs applies to projects as well. This paper examines the need for responsible leadership in projects. The context for this study is that of PPPs in infrastructure projects as the authors have been working in this area.The authors would like to propose a framework of responsible project leadership based on the literature and interviews conducted with a purposeful sample of project leaders involved in infrastructure projects in three countries (India, China and Australia) for this paper.

Sankaran, S, Müller, R & Drouin, N 1970, 'Developing actionable knowledge and leadership theory in project management through a collaborative research project', European Academy Of Management 2019, EURAM 2019, Lisbon, Portugal.
View description>>

Scientific collaboration is on the rise, as reported in the literature, driven by a need to contain costs by sharing resources, advancing knowledge to innovate and the rising need to work across disciplines to deal with complex problems. Due to advances in information and communication technologies coupled with reduced travel costs scientists are also able to collaborate across geographical boundaries more easily rather than work co-located in laboratories. Social scientists are also following this trend, and an increase in collaborative research in some social science disciplines are being reported (Endersby 1996; Hunter & Leahy 2008; Lassi & Sonnenwald 2010; Wooley et al. 2015).Studies report an increase in co-authorship in articles published in management journals. Acedo, Borosso, Casanueva and Galán (2006), who reviewed co-authorship in highly ranked management journals report a ‘progressive growth in the number of coauthored papers’ (p. 979). Choudhry and Uddin (2018), who investigated collaborative research in project management, compared the co-authorship of articles in project management journals in 2006–2010 and 2011–2016 and found an increase in co-authorship in project management journals. They also found that co-authorship in scholarly articles, which is ‘the best-known measure of such collaborations’ (p. 9) resulted in ‘more citations and wider acceptability’ (p. 35) in project management research. From the literature review presented in this paper it has also been found that multi-authored articles receive more citations and increased research productivity. According to Sonnenwald (2007) they also get published in higher impact journals. Success of publications is often measured by the ranking of the journal in which they are published and by the number of citations they receive. Yet very little is known about how collaboration takes place in project management research other than a reported increase in co-authorship. This motivates us...

Shakor, P, Nejadi, S & Paul, G 1970, 'Effect of Elevated Temperatures as a Means of Curing in Inkjet 3D Printed Mortar Specimens', Biennial National Conference of the Concrete Institute of Australia, Concrete Institute of Australia, Sydney, Australia.
View description>>

Inkjet (Powder-based) three-dimensional printing (3DP) shows significant promise in concrete construction applications. The accuracy, speed, and capability to build complicated geometries are the most beneficial features of inkjet 3DP. Therefore, inkjet 3DP needs to be carefully studied and evaluated with construction goals in mind and employed in real-world applications, where it is most appropriate. This paper focuses on the important aspect of curing 3DP specimens. It discusses the enhanced mechanical properties of the mortar that are unlocked through a heat-curing process. Experiments have been conducted on cubic mortar samples that have been printed and cured in an oven at a range of different temperatures (e.g. 40, 60, 80, 90, 100°C). The results of the experimental tests have shown that 80°C is the optimum heat-curing temperature to achieve the highest compressive strength and flexural strength of the printed samples. These tests have been performed on two different dimensions of the cubic specimens 20x20x20mm, 50x50x50mm and on prism specimens with the dimensions of 160x40x40mm. The inkjet 3DP process and the post-processing curing are discussed. Additionally, 3D scanning of the printed specimens is employed and the surface roughness profiles of the 3DP specimens are presented.

Shi, X, Liu, D, Chen, Z, Chen, G, Huang, S, Lu, W & Zhang, Y 1970, 'A Low-Power Single-Slope based 14-bit Column-Level ADC for 384×288 Uncooled Infrared Imager', 2019 IEEE 13th International Conference on ASIC (ASICON), 2019 IEEE 13th International Conference on ASIC (ASICON), IEEE, PEOPLES R CHINA, Chongqing, pp. 1-4.
View/Download from: Publisher's site

Sukkar, F, Best, G, Yoo, C & Fitch, R 1970, 'Multi-Robot Region-of-Interest Reconstruction with Dec-MCTS', 2019 International Conference on Robotics and Automation (ICRA), 2019 International Conference on Robotics and Automation (ICRA), IEEE, Montreal, QC, Canada, Canada, pp. 9101-9107.
View/Download from: Publisher's site
View description>>

© 2019 IEEE. We consider the problem of reconstructing regions of interest of a scene using multiple robot arms and RGB-D sensors. This problem is motivated by a variety of applications, such as precision agriculture and infrastructure inspection. A viewpoint evaluation function is presented that exploits predicted observations and the geometry of the scene. A recently proposed non-myopic planning algorithm, Decentralised Monte Carlo tree search, is used to coordinate the actions of the robot arms. Motion planning is performed over a navigation graph that considers the high-dimensional configuration space of the robot arms. Extensive simulated experiments are carried out using real sensor data and then validated on hardware with two robot arms. Our proposed targeted information gain planner is compared to state-of-the-art baselines and outperforms them in every measured metric. The robots quickly observe and accurately detect fruit in a trellis structure, demonstrating the viability of the approach for real-world applications.

Sutjipto, S, Tish, D, Paul, G, Vidal-Calleja, T & Schork, T 1970, 'Towards Visual Feedback Loops for Robot-Controlled Additive Manufacturing', Robotic Fabrication in Architecture, Art and Design 2018, Robotic Fabrication in Architecture, Art and Design, Springer International Publishing, Zurich, pp. 85-97.
View/Download from: Publisher's site
View description>>

Robotic additive manufacturing methods have enabled the design and fabrication of novel forms and material systems that represent an important step forward for architectural fabrication. However, a common problem in additive manufacturing is to predict and incorporate the dynamic behavior of the material that is the result of the complex confluence of forces and material properties that occur during fabrication. While there have been some approaches towards verification systems, to date most robotic additive manufacturing processes lack verification to ensure deposition accuracy. Inaccuracies, or in some instances critical errors, can occur due to robot dynamics, material self-deflection, material coiling, or timing shifts in the case of multi-material prints. This paper addresses that gap by presenting an approach that uses vision-based sensing systems to assist robotic additive manufacturing processes. Using online image analysis techniques, occupancy maps can be created and updated during the fabrication process to document the actual position of the previously deposited material. This development is an intermediary step towards closed-loop robotic control systems that combine workspace sensing capabilities with decision-making algorithms to adjust toolpaths to correct for errors or inaccuracies if necessary. The occupancy grid map provides a complete representation of the print that can be analyzed to determine various key aspects, such as, print quality, extrusion diameter, adhesion between printed parts, and intersections within the meshes. This valuable quantitative information regarding system robustness can be used to influence the system’s future actions. This approach will help ensure consistent print quality and sound tectonics in robotic additive manufacturing processes, improving on current techniques and extending the possibilities of robotic fabrication in architecture.

To, KYC, Lee, KMB, Yoo, C, Anstee, S & Fitch, R 1970, 'Streamlines for Motion Planning in Underwater Currents', Proceedings - IEEE International Conference on Robotics and Automation, International Conference on Robotics and Automation, Montreal, QC, Canada, pp. 4619-4625.
View/Download from: Publisher's site
View description>>

Motion planning for underwater vehicles must consider the effect of oceancurrents. We present an efficient method to compute reachability and costbetween sample points in sampling-based motion planning that supportslong-range planning over hundreds of kilometres in complicated flows. The ideais to search a reduced space of control inputs that consists of streamfunctions whose level sets, or streamlines, optimally connect two given points.Such stream functions are generated by superimposing a control input onto theunderlying current flow. A streamline represents the resulting path that avehicle would follow as it is carried along by the current given that controlinput. We provide rigorous analysis that shows how our method avoids exhaustivesearch of the control space, and demonstrate simulated examples in complicatedflows including a traversal along the east coast of Australia, using actualcurrent predictions, between Sydney and Brisbane.

Turner, JR, Lecoeuvre, L, Sankaran, S & Er, M 1970, 'Marketing for the project: project marketing by the contractor', International Journal of Managing Projects in Business, EURAM 2016: Manageable Cooperation?, Emerald, Paris, pp. 211-227.
View/Download from: Publisher's site
View description>>

PurposeThe purpose of this paper is to identify the marketing practices adopted by contractors in project-based industries to win new business and maintain relationships with existing clients.Design/methodology/approachThe authors interviewed eight such contractors, and used activity theory as a lens to analyze the results. The authors investigated project marketing activities at four stages of the project contract life cycle, and against four enablers of collaboration.FindingsThe authors have identified that the service-dominant logic pervades project marketing. Through the project contract life cycle the marketing activity starts with a strategic focus, becomes tactical, then operational and returns to strategic. Project marketing involves executive managers, marketing, client or account managers and project managers. Project managers have a key responsibility for project marketing. The four enablers of collaboration, relationships, communication, going-with and trust, support each other and the entire project marketing activity.Research limitations/implicationsAs a contribution to theory, the authors have identified the practices adopted by contractors in project-based industries to market their competencies to clients to win new work and maintain relationships with existing clients. The authors have identified practices throughout the contract life cycle, and practices to develop collaboration. The next step will be to explain these practices in terms of traditional marketing theory.Practical implications

Ulapane, N, Piyathilaka, L & Kodagoda, S 1970, 'Some Convolution and Scale Transformation Techniques to Enhance GPR Images', 2019 14th IEEE Conference on Industrial Electronics and Applications (ICIEA), 2019 14th IEEE Conference on Industrial Electronics and Applications (ICIEA), IEEE, Xi'an, China, pp. 1453-1458.
View/Download from: Publisher's site
View description>>

© 2019 IEEE. Locating reinforcement rods embedded inside concrete wall-like structures, as well as locating subsurface features such as voids, cracks, and interfaces is an essential part of structural health monitoring of concrete infrastructure. The Ground Penetrating Radar (GPR) technique has been commonly used as a means of Non-destructive Testing and Evaluation (NDT E) which suits the purpose. In the recent past, the interest of using GPR to assess the crowns (i.e., top) of concrete sewers has been rising. Moisture is well known to be a challenge for GPR imaging as moisture tends to influence GPR waves. This challenge becomes more common and persistent inside sewers since sewer walls contain considerable surface and subsurface moisture as a result of the humid environment created by the waste water flowing through sewers as well as the bacteria and gas induced acid attacks. Forming a part of sewer condition assessment-related research with the objective of assessing moist concrete, this paper presents some preliminary results which demonstrate how some simple scale transformations and convolution can help in enhancing GPR images in grey-scale. A set of raw GPR signals captured on a moist concrete block inside a laboratory environment is considered. The effect of enhancement is demonstrated against a benchmark image constructed by mapping the raw signals directly onto grey-scale.

Ulapane, N, Wickramanayake, S & Kodagoda, S 1970, 'Pulsed Eddy Current Sensing for Condition Assessment of Reinforced Concrete', 2019 14th IEEE Conference on Industrial Electronics and Applications (ICIEA), 2019 14th IEEE Conference on Industrial Electronics and Applications (ICIEA), IEEE, China, pp. 1-6.
View/Download from: Publisher's site
View description>>

© 2019 IEEE. Reinforced concrete (i.e., concrete wall-like structures having steel reinforcement rods embedded within) are commonly available as civil infrastructures. Such concrete structures, especially the walls of sewers, are vulnerable to bacteria and gas induced acid attacks which contribute to deterioration of the concrete and subsequent concrete wall loss. Therefore, quantification of concrete wall loss becomes important in determining the health and structural integrity of concrete walls. An effective strategy that can be formulated to quantify concrete wall loss is, locating a reinforcement rod and determining the thickness of concrete overlaying the rod via Non-destructive Testing and Evaluation (NDT E). Pulsed Eddy Current (PEC) sensing is commonly used for NDT E of metallic structures, including ferromagnetic materials. Since steel reinforcement rods that are commonly embedded in concrete also are ferromagnetic, this paper contributes by presenting experimental results, which suggest the usability of PEC sensing for reinforced concrete assessment, via executing the aforementioned strategy.

Vu, TL, Liu, L, Paul, G & Vidal-Calleja, T 1970, 'Rectangular-shaped object recognition and pose estimation', Australasian Conference on Robotics and Automation, ACRA, Australian Conference on Robotics and Automation, ARAA, Adelaide, pp. 1-9.
View description>>

This paper presents a novel solution for rectangular-shaped object pose estimation in the robotic bin-picking problem, using data from a single RGB-D camera collecting point cloud data from a fixed position. The key benefit of the presented framework is its ability to accurately and robustly locate an object position and orientation, which allows for high-precision robotic grasping and placing of such objects in an open-loop motion execution system. Firstly, intelligent grasping surface selection is performed, then Principal Component Analysis is used for pose estimation and finally, rotation averaging is integrated to significantly improve noise-reduction over time. Comparisons between the resulting poses and ones estimated by a traditional Iterative Closest Point technique, have demonstrated the framework’s advantages for pose estimation tasks.

Wickramanayake, S, Thiyagarajan, K, Kodagoda, S & Piyathilaka, L 1970, 'Frequency Sweep Based Sensing Technology for Non-destructive Electrical Resistivity Measurement of Concrete', Proceedings of the International Symposium on Automation and Robotics in Construction (IAARC), 36th International Symposium on Automation and Robotics in Construction, International Association for Automation and Robotics in Construction (IAARC), Canada, pp. 1290-1290.
View/Download from: Publisher's site
View description>>

© 2019 International Association for Automation and Robotics in Construction I.A.A.R.C. All rights reserved. Electrical resistivity is an important parameter to be monitored for the conditional assessment and health monitoring of aging and new concrete infrastructure. In this paper, we report the design and development of a frequency sweep based sensing technology for non-destructive electrical resistivity measurement of concrete. Firstly, a sensing system prototype was developed based on the Wenner probe arrangement for the electrical resistivity measurements. This system operates by integrating three major units namely current injection unit, sensing unit and microcontroller unit. Those units govern the overall operations of the sensing system. Secondly, the measurements from the developed unit were compared with the measurements of the commercially available device at set conditions. This experimentation evaluated the measurement performance and demonstrated the effectiveness of the developed sensor prototype. Finally, the influence of rebar and the effect of frequency on the electrical measurements were studied through laboratory experimentation on a concrete sample. Experimental results indicated that the electrical resistivity measurements taken at a closer proximity to the rebar had its influence than the measurements taken away from the rebar in the ideal set condition. Also, the increase in electrical resistivity to the increase in frequency was observed, and then the measurements show lesser variations to higher frequency inputs.

Yoo, C, Anstee, S & Fitch, R 1970, 'Stochastic Path Planning for Autonomous Underwater Gliders with Safety Constraints', 2019 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS), 2019 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS), IEEE, Macau, China, pp. 3725-3732.
View/Download from: Publisher's site
View description>>

© 2019 IEEE. Autonomous underwater gliders frequently execute extensive missions with high levels of uncertainty due to limitations of sensing, control and oceanic forecasting. Glider path planning seeks an optimal path with respect to conflicting objectives, such as travel cost and safety, that must be explicitly balanced subject to these uncertainties. In this paper, we derive a set of recursive equations for state probability and expected travel cost conditional on safety, and use them to implement a new stochastic variant of FMT-{ast } in the context of two types of objective functions that allow a glider to reach a destination region with minimum cost or maximum probability of arrival given a safety threshold. We demonstrate the framework using three simulated examples that illustrate how user-prescribed safety constraints affect the results.

Yu, H, Lu, W & Liu, D 1970, 'A Unified Closed-Loop Motion Planning Approach For An I-AUV In Cluttered Environment With Localization Uncertainty', 2019 International Conference on Robotics and Automation (ICRA), 2019 International Conference on Robotics and Automation (ICRA), IEEE, Montreal, CA, pp. 4646-4652.
View/Download from: Publisher's site
View description>>

© 2019 IEEE. This paper presents a unified motion planning approach for an Intervention Autonomous Underwater Vehicle (I-AUV) in a cluttered environment with localization uncertainty. With the uncertainty being propagated by an information filter, a trajectory optimization problem closed by a Linear-Quadratic-Gaussian controller is formulated for a coupled design of optimal trajectory, localization, and control. Due to the presence of obstacles or complexity of the cluttered environment, a set of feasible initial I-AUV trajectories covering multiple homotopy classes are required by optimization solvers. Parameterized through polynomials, the initial base trajectories are from solving quasi-quadratic optimization problems that are linearly constrained by waypoints from RRTconnect, while the initial trajectories of the manipulator are generated by a null space saturation controller. Simulations on an I-AUV with a 3 DOF manipulator in cluttered underwater environments demonstrated that initial trajectories are generated efficiently and that optimal and collision-free I-AUV trajectories with low state uncertainty are obtained.

Zhu, H, Leighton, B, Chen, Y, Ke, X, Liu, S & Zhao, L 1970, 'Indoor Navigation System Using the Fetch Robot', Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), International Conference on Intelligent Robotics and Applications, Springer International Publishing, Shenyang, China, pp. 686-696.
View/Download from: Publisher's site
View description>>

© 2019, Springer Nature Switzerland AG. In this paper, we present a navigation system, including off-line mapping and on-line localization, for the Fetch robot in an indoor environment using Cartographer. This framework aims to build a practical, robust, and accurate Robot Operating System (ROS) package for the Fetch robot. Firstly, using Cartographer and the fusion of data from a laser scan and RGB-D camera, a two-dimensional (2D) off-line map is built. Then, the Adaptive Monte Carlo Localization (AMCL) ROS package is used to perform on-line localization. We use a simulation to validate this method of mapping and localization, then demonstrate our method live on the Fetch robot. A video about the simulation and experiment is shown in https://youtu.be/oOvxTOowe34.

Best, G 2019, 'Planning algorithms for multi-robot active perception'.

Kong, FH, Zhao, J, Zhao, L & Huang, S 2019, 'Analysis of minima for geodesic and chordal cost for a minimal 2D pose-graph SLAM problem'.

Lee, JJH, Yoo, C, Anstee, S & Fitch, R 2019, 'Efficient Optimal Planning in non-FIFO Time-Dependent Flow Fields', arXiv.
View description>>

We propose an algorithm for solving the time-dependent shortest path problem in flow fields where the FIFO (first-in-first-out) assumption is violated. This problem variant is important for autonomous vehicles in the ocean, for example, that cannot arbitrarily hover in a fixed position and that are strongly influenced by time-varying ocean currents. Although polynomial-time solutions are available for discrete-time problems, the continuous-time non-FIFO case is NP-hard with no known relevant special cases. Our main result is to show that this problem can be solved in polynomial time if the edge travel time functions are piecewise-constant, agreeing with existing worst-case bounds for FIFO problems with restricted slopes. We present a minimum-time algorithm for graphs that allows for paths with finite-length cycles, and then embed this algorithm within an asymptotically optimal sampling-based framework to find time-optimal paths in flows. The algorithm relies on an efficient data structure to represent and manipulate piecewise-constant functions and is straightforward to implement. We illustrate the behaviour of the algorithm in an example based on a common ocean vortex model in addition to simpler graph-based examples.

Lee, KMB, Yoo, C, Hollings, B, Anstee, S, Huang, S & Fitch, R 2019, 'Online Estimation of Ocean Current from Sparse GPS Data for Underwater Vehicles', arXiv.

Ma, H, Wang, Y, Tang, L, Kodagoda, S & Xiong, R 2019, 'Towards navigation without precise localization: Weakly supervised learning of goal-directed navigation cost map'.

Ma, H, Wang, Y, Xiong, R, Kodagoda, S & Luo, Q 2019, 'Weakly-Supervised Road Affordances Inference and Learning in Scenes without Traffic Signs'.

Ma, H, Wang, Y, Xiong, R, Kodagoda, S & Tang, L 2019, 'DeepGoal: Learning to Drive with driving intention from Human Control Demonstration'.

Munasinghe, N & Paul, G 2019, 'Advanced Manufacturing of Spirals for Mineral Separation with Integrated Smart Sensing'.
View description>>

Gravity Separation Spirals (GSS) are vital to the mining industry for separating mineral-rich slurry into its different density components. The slurry is pumped to the top and, then the spiral slope naturally helps separate the slurry due to the different particle density. Spiral profile can be slightly varied for every customer, depending on the mineral they separate. The research project is focused on developing a 3D printer to print GSS, which can avoid the drawbacks inherent to the traditional GSS manufacturing process. Another objective of this project is to embed sensors into the 3D-printed GSS for remotely monitor the operational conditions, fault diagnosis, and predictive maintenance. 3D printed sensors are being developed instead of embedding conventional sensors where possible since they are low-cost and can be integrated into the large build volume of the structural material without compromising the mechanical integrity of the object.

Paul, G 2019, 'Preparing Students to Integrate Robots into Futuristic Advanced Manufacturing Applications'.
View description>>

All-expenses-paid keynote presentation in Shenzhen, China, for the 'Artificial Intelligence and Intelligent Robot Technology Conference' on 5 - 6 Jan 2019. Over 300 attendees from academia, industry, and government. More details here (English):https://www.dobot.cc/event/2019-ai-seminar-calls-for-new-mode-of-university-enterprise-cooperation-to-better-cultivate-talents-in-the-new-era.htmlChinese news:- http://m.gongkong.com/News/detail?id=390816&from=singlemessage&isappinstalled=0- https://robot.m.ofweek.com/2019-01/ART-8321200-8120-30295903.html

Piyathilaka, L & Kodagoda, S 2019, 'Understanding Human Context in 3D Scenes by Learning Spatial Affordances with Virtual Skeleton Models'.

Song, J, Bai, F, Zhao, L, Huang, S & Xiong, R 2019, 'Efficient two step optimization for large embedded deformation graph based SLAM'.

Song, J, Zhao, L, Huang, S & Dissanayake, G 2019, 'An observable time series based SLAM algorithm for deforming environment'.

To, KYC, Lee, KMB, Yoo, C, Anstee, S & Fitch, R 2019, 'Streamlines for Motion Planning in Underwater Currents', arXiv.