Guo, YJ 1994, 'Offset Fresnel lens antenna', IEE Proceedings - Microwaves, Antennas and Propagation, vol. 141, no. 6, pp. 517-517.
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An analysis of the offset Fresnel lens antenna is presented using the vectorial Kirchhoff diffraction theory. Equations for predicting the copolarized and crosspolarized radiation patterns are given. Two approaches to evaluating the far-field integration are introduced. Antenna performance such as the sidelobe and the crosspolarization levels is investigated. An experimental offset Fresnel lens is reported. Measured results agree well with the theoretical prediction.
Guo, YJ & Barton, SK 1994, 'Offset Fresnel zone plate antennas', International Journal of Satellite Communications, vol. 12, no. 4, pp. 381-385.
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AbstractThe theory of offset Fresnel zone plate antennas is presented. Explicit formulae for the design of the zone boundaries for the offset Fresnel zone plate are given. Theorectical equations and numerical results for the far‐field analysis are presented. It is found that when the offset angle increases, the zone boundaries become more elliptic and the plate becomes more asymmetric in the E‐plane. With the number of full wave zones and the plate width in the W‐plane fixed, the plate width in the E‐plane increases with the offset angle, which keeps the projected aperture area constant. Within a limited range of offset angles, the offset configuration can be employed without degrading the radiation performance much. For large offset angles, however, the asymmetry of the configuration may lead to increased sidelobes and decreased antenna directivity. An experiment with one particular phase reversal zone plate antenna with 30° offset angle shows good agreement between the measured antenna pattern and the theoretical prediction.
Guo, YJ, Sassi, IH & Barton, SK 1994, 'Multilayer offset Fresnel zone plate reflector', IEEE Microwave and Guided Wave Letters, vol. 4, no. 6, pp. 196-198.
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An offset phase-correcting Fresnel zone plate (FZP) reflector antenna based on the multilayer configuration is presented. The reflector consists of a conducting ground and four layers of conducting patterns separated by four dielectric substrates. An experimental prototype designed at 10.39 GHz was fabricated and tested. With a 0.32 m by 0.34 m elliptical reflector aperture and a pyramidal feedhorn, the antenna achieved –20-dB sidelobe level and 61% maximum efficiency. Compared with a phase reversal FZP of the same size, a 3.3-dB gain improvement and significant sidelobe reduction were obtained. © 1994 IEEE
LIU, YS & HOANG, DB 1994, 'OSI RPC MODEL AND PROTOCOL', COMPUTER COMMUNICATIONS, vol. 17, no. 1, pp. 53-66.
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Remote procedure call (RPC) provides a useful paradigm for developing distributed applications. The growing use of RPC in developing distributed applications has resulted in international efforts to standardize RPC mechanisms to ensure future interoperab
Ni, W, Xia, JS & Adams, ED 1994, 'Spin-wave velocity, entropy, and magnetization in bcc solidHe3', Physical Review B, vol. 50, no. 1, pp. 336-339.
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Shimizu, J, Miyanaga, Y & Tochinai, K 1994, 'Decimation ratio in subband adaptive identification of a time‐varying AR model', Electronics and Communications in Japan (Part III: Fundamental Electronic Science), vol. 77, no. 11, pp. 78-90.
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AbstractThis paper presents some conditions to determine decimation ratio in subband adaptive identification of a time‐varying system. It has been reported in some experiments that a large decimation ratio is not suitable for subband identification of a time‐varying system. However, theoretical conditions for a maximally decimated ratio in a time‐varying system have not to date been reported.A short‐time invariant model is the starting point for this research. The relation between a forgetting factor used in the recursive weighted least‐squares (RWLS) algorithm and a time variation of the time‐varying system are derived. Then, new forgetting factors are derived for the multirate processing case. Using a convergence property provided by these forgetting factors, theoretical conditions are obtained having parameters estimated from decimated signals that are as accurate as those from all observed signals. The propriety of these conditions is demonstrated using simulations.
Tuan, HD 1994, 'Contingent and Intermediate Tangent Cones in Hyperbolic Differential Inclusions and Necessary Optimality Conditions', Journal of Mathematical Analysis and Applications, vol. 185, no. 1, pp. 86-106.
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Veitch, D 1994, 'Renormalization of C0 bimodal maps', Physica D: Nonlinear Phenomena, vol. 71, no. 3, pp. 269-284.
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ZHANG, C, YANG, JIE, CHEN, X & GUO, Y 1994, 'A NEW DESIGN PRINCIPLE FOR POLE-CHANGING WINDING-THE THREE-EQUATION PRINCIPLE', Electric Machines & Power Systems, vol. 22, no. 2, pp. 187-199.
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Biggs, CJ, Brookes, W & Indulska, J 1970, 'Enhancing interoperability of DCE applications: a type management approach', Proceedings of IEEE Workshop on Services for Distributed and Networked Environments, IEEE Workshop on Services for Distributed and Networked Environments, IEEE Comput. Soc. Press, pp. 50-57.
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© 1994 IEEE. The paper presents an enhancement to the OSF DCE platform for distributed computing that is designed to enhance interoperability of applications. Concepts from Open Distributed Processing have been taken, extended and applied to DCE to improve the capacity for late binding, system evolution, resource discovery and software reusability. The paper analyzes approaches to application interoperability in a number of distributed computing platforms and based on the results, describes an enhancement for the DCE platform. The paperfocuses on one component of this enhancement: a type manager that will be able to canonically describe types of interacting objects and types of relationships between them.
Cucchiara, R, Di Stefano, L, Monacelli, M, Piccardi, M & Rustichelli, G 1970, 'A parallel vision subsystem for robotic inspection and manipulation', Proceedings of IECON'94 - 20th Annual Conference of IEEE Industrial Electronics, IECON'94 - 20th Annual Conference of IEEE Industrial Electronics, IEEE, pp. 862-866.
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The paper describes an SIMD massively parallel computer conceived for robot vision, and presents an application where the system is installed on a mobile robot to support inspection and manipulation tasks. The system consists of a scalable array of up to 4K single-bit processors controlled by a general-purpose microcomputer through a dedicated interface. The system's architecture is overviewed, addressing the available prototype as well as the functional units currently under design. We provide examples of image analysis goals that can be efficiently reached using spatially-organized parallel architectures such as SIMD array and give measurements of present performances. Using code profiles we also evaluate the speedup associated with the configuration being designed.
GAY, V, LEYDEKKERS, P & INTVELD, RH 1970, 'SPECIFICATION OF AUDIO VIDEO EXCHANGE BASED ON THE REFERENCE MODEL OF ODP', BROADBAND ISLANDS '94 - CONNECTING WITH THE END-USER, 3rd International Conference on Broadband Islands - Connecting with the End-User, ELSEVIER SCIENCE PUBL B V, HAMBURG, GERMANY, pp. 179-191.
Hui, SYR & Zhu, J 1970, 'Magnetic hysteresis modeling and simulation using the Preisach theory and TLM technique', Proceedings of 1994 Power Electronics Specialist Conference - PESC'94, 1994 Power Electronics Specialist Conference - PESC'94, IEEE, TAIPEI, TAIWAN, pp. 837-842.
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Kervella, B, Gay, V & Horlait, E 1970, 'Towards a complete multimedia mail: Use of MHEG in standard messaging systems', Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), Springer Berlin Heidelberg, pp. 1-13.
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© 1994, Springer Verlag. All Rights Reserved. This paper addresses multimedia aspects in messaging services. It highlights the functionalities that are missing to provide what we call a complete multimedia mail service and it gives standard solutions to integrate those additional functionalities in standard messaging systems. A complete multimedia messaging system does not provide only means to exchange simple multimedia messages having a reasonable size. It should first enable the transfer of multimedia information, directly or by references (e.g. for huge message). In case it uses a reference, files may be retrieved in connected mode. This is, in fact, already included in most messaging systems. Second, it should also be open to the introduction of new media types. This requires the introduction of functionalities to prevent the fact some workstations cannot support those media types. Third, it should enable the composition, the exchange and the presentation of formatted multimedia messages. MIME and X.400-based solutions are presented for the two first issues. For the third issue, we have chosen MHEG as a basis. This future standard is promising and this paper presents how to implement MHEG functionalities in messaging systems.
Leydekkers, P & Gay, V 1970, 'Multimedia Conferencing Services in an Open Distributed Environment.', IWACA, Springer, pp. 339-352.
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© 1994, Springer Verlag. All rights reserved. Distributed Processing Environments (DPE) or platforms are regarded as the future telecommunication architecture [1] on which distributed applications such as Multimedia Conferencing (MMC) services will operate. Using the DPE as target telecommunication platform, an important issue for MMC designers is the specification of generic MMC interfaces. This enables MMC users to access, in a distribution transparent way, a wide range of MMC services, that conform to these interface specifications. This paper proposes a classification of MMC services by means of three generic interface templates. These interface templates describe in an implementation independent way the functionality and management related to MMC services. The paper discusses also a possible implementation of these interfaces. Techniques and concepts are used as proposed by RM-ODP [2] and TINA-C [1].
Logé, C, Gay, V & Horlait, E 1970, 'Computational components for synchronous cooperation on multimedia information', Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), Springer Berlin Heidelberg, pp. 89-102.
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© 1994, Springer Verlag. All Rights Reserved. Nowadays, the design of cooperative applications is becoming more complex due to the introduction of real time cooperation and multimedia aspects. To ease and accelerate the development of these applications it is necessary to build modular and reusable functional components that can be used by application designers. The objective of this paper is to define some of those functional components. They will be integrated in the cooperative applications to ensure the synchronous cooperation on multimedia objects. For openness and possible wide use in an open distributed heterogeneous environment, the specification of those components is based on the computational language of the Reference Model of Open Distributed Processing (RMODP).
Ni, W, Xia, JS & Adams, ED 1970, 'Thermodynamic properties of bcc solid3He near the ordering transitions', Physica B: Condensed Matter, 20th International Conference on Low Temperature Physics, Elsevier BV, OR, EUGENE, pp. 941-942.
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