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2004 IEEE International Conference on Communications

作者： Cho, Jaeweon Haas, Zygmunt J. Samsung Electronics Co. Ltd. Telecommunication R and D Center 416 Maetan-3 Suwon Gyeonggi 442-600 Korea Republic of Cornell University Sch. of Elec./Computer Engineering Ithaca NY 14853 United States

In this paper, we investigate the impacts of transmission concurrency on the throughput of the downstream channel in multi-hop cellular networks. In particular, this paper focuses on the tradeoff between the improvement of resource reuse and the increase in radio interference. We evaluate and compare the throughput for various concurrency types of multi-hop relaying. We also propose a hybrid control strategy, in which we advocate the use of both, the concurrent and the non-concurrent transmissions. Our results show that the throughput can be increased by allowing transmission concurrency, but the concurrency does not always result in higher throughput, relative to the non-concurrency case, because of the interference between concurrently transmitting links. In the random topology with shadowing, depending on the particular circumstances, either the concurrent or the non-concurrent case can be the optimal transmission strategy. Thus, in order to achieve a significant improvement, a hybrid sch.me should be employed. Additionally, if concurrency is applied, it should be used among the different downstream paths, rather than between the hops on the same downstream path.

关键词： Mobile telec.mmunication systems

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A PWM strategy for four-leg voltage source converters and applications to a novel line interactive UPS in a three-phase four-wire system

A PWM strategy for four-leg voltage source converters and ap...

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Conference Record of the 2004 IEEE Industry Applications Conference;39th IAS Annual Meeting

作者： Kim, Jang-Hwan Sul, Seung-Ki Kim, Hyosung Ji, Jun-Keun Sch. of Elec. Eng. and Comp. Science Seoul National University Korea Republic of Department of Control Engineering Cheonan National Technical College Korea Republic of Div. of Info. Technology Engineering Soonchunhyang University Korea Republic of

ISBN: (纸本)0780384865

A four-leg Pulse Width Modulation (PWM) Voltage Source Converter (VSC) is used to supply three phase balanced voltage even under an unbalanced load condition in three phase four wire power distribution network. A novel carrier-based modulation technique for the converter is described with the concept of an offset voltage and also is extended to so called 'discontinuous PWM (DPWM)' to minimize switching losses of VSC. As a practical application example of the four-leg VSC, a line interactive Uninterruptible Power Supply (UPS) system is chosen. The feasibility of the proposed PWM strategies and control algorithms has been verified by the simulation and experimental results.

关键词： elec.ric converters

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Deriving change architectures from RCS history

Deriving change architectures from RCS history

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Proceedings of the Eighth IASTED International Conference on Software engineering and Applications

作者： Stringfellow, C. Amory, C.D. Potnuri, D. Georg, M. Andrews, A. Department of Computer Science Midwestern State University Wichita Falls TX 76308 United States Computer Science Department Colorado State University Fort Collins CO 80523-1873 United States Sch. of Elec. Eng. and Comp. Science Washington State University Pullman WA 99164 United States

ISBN: (纸本)0889864276

As software systems evolve over a series of releases, it becomes important to know which components show repeated need for maintenance. Deterioration of a single component manifests itself in repeated and increasing problems that are local to the component. A second type of deterioration is related to interactions between components, that is, components are repeatedly change-prone in their relationships with each other. The latter requires changes to code in multiple components and is a sign of problems with the software architecture of the system. Software architecture problems are by far more costly to fix and thus it is very desirable to identify potential architectural problems early and to track them across multiple releases. This paper uses Revision Control System (RCS) change history to determine which system parts are the most change-prone, both locally and in their interactions with other parts of the systems. Relationships among system components are identified based on whether they are involved in the same group of changes, and how many lines of code are changed. The resulting change architecture figures show what the system's most change-prone components and relationships are. We illustrate our technique on a large commercial system consisting of over 800 KLOC of C, C++, and microcode.

关键词： computer architecture

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Simulating the navigation and control of autonomous agents

Simulating the navigation and control of autonomous agents

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Proceedings of the Seventh International Conference on Information Fusion, FUSION 2004

作者： Gelenbe, Erol Kaptan, Varol Hussain, Khaled Department of Electrical Engineering Imperial College London SW7 2BT United Kingdom Sch. of Elec. Eng. and Comp. Science University of Central Florida Orlando FL 32816 United States

ISBN: (纸本)917056115X

While traditional data fusion started with systems which exploit the output of multiple sensors so as to optimise the characterisation or recognition of objects of interest, modem information fusion systems will increasingly integrate all types of information, including behavioural information and information resulting from modelling, analysis and computation. In many critical applications, modelling the behaviour of groups of coordinated autonomous entities must be carried out within physically accurate settings in order to provide realistic information about their likely behaviour. The simulated entities must conduct autonomous actions which are realistic, which follow plans of action, but which also exhibit intelligent reactive behaviour in response to unforeseen conditions. In this paper we describe how a complex and simulation environment can be used to fuse information about the behaviour of groups of objects of interest. The fused information includes the objects' individual pursuits and aims, the physical and geographic setting within which they act, and their collective social behaviour. The group control algorithms combine reinforcement learning, social potential fields and imitation. We summarise the design of a simulation system that we have designed based on these principles.

关键词： Autonomous agents

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Link layer assisted mobility support using SIP for real-time multimedia communications

Link layer assisted mobility support using SIP for real-time...

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MobiWac'04 - Proceedings of the Second International Workshop on Mobility Management and Wireless Access Protocols

作者： Kim, Wooseong Kim, Myungchul Lee, Kyounghee Yu, Chansu Lee, Ben School of Engineering Info. and Communications University Daejeon Korea Republic of Department of Electrical Engineering Cleveland State University Cleveland OH United States Sch. of Elec. Eng. and Comp. Science Oregon State University Corvallis OR United States

ISBN: (纸本)1581139209

Session Initiation Protocol (SIP) was standardized for real-time applications and extended to support terminal mobility by Internet Expert Task Force (IETF). However, SIP terminal mobility suffers from the considerable handoff latency which is unsuitable for the real-time communications. In this paper, we propose Predictive Address Reservation with SIP (PAR-SIP) which decreases handoff delay by proactively processing the address allocation and session update using link layer information of wireless networks.

关键词： Multimedia systems

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Bayesian inference on principal component analysis using reversible jump markov chain Monte Carlo

Bayesian inference on principal component analysis using rev...

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Proceedings - Nineteenth National Conference on Artificial Intelligence (AAAI-2004): Sixteenth Innovative Applications of Artificial Intelligence Conference (IAAI-2004)

作者： Zhang, Zhihua Chan, Kap Luk Kwok, James T. Yeung, Dit-Yan Department of Computer Science Hong Kong Univ. of Sci. and Technol. Clear Water Bay Hong Kong Hong Kong Sch. of Elec. and Electron. Eng. Nanyang Technological University Nanyang Avenue Singapore 639798

Based on the probabilistic reformulation of principal component analysis (PCA), we consider the problem of determining the number of principal components as a model selec.ion problem. We present a hierarchical model for probabilistic PCA and construct a Bayesian inference method for this model using reversible jump Markov chain Monte Carlo (MCMC). By regarding each principal component as a point in a one-dimensional space and employing only birth-death moves in our reversible jump methodology, our proposed method is simple and capable of automatically determining the number of principal components and estimating the parameters simultaneously under the same disciplined framework. Simulation experiments are performed to demonstrate the effectiveness of our MCMC method.

关键词： Principal component analysis

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MedNet: A pervasive patient information network with decision support

MedNet: A pervasive patient information network with decisio...

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Proceedings - 6th International Workshop on Enterprise Networking and Computing in Healthcare Industry, Healthcom 2004

作者： Narasimhan, V. Lakshmi Irfan, Malik Yefremov, Maxim Department of Software Engineering Sch. of Elec. Eng. and Comp. Science University of Newcastle NSW 2308 Australia University of Newcastle Athena Info Services Pty Ltd. PO Box 2204 Dangar NSW 2308 Australia

ISBN: (纸本)0780384539

MedNet is a mobile network system primarily aimed at meeting the needs of Medical Service Providers (MSPs). MedNet addresses two important facets of research in patient care, namely, providing just-in-time medical care within hospital and outside of it, whilst offering the convenience of working "any where any time" for the service provider. MedNet is being developed through the judicious use of mobile devices and software services through an integrated information environment. A decision support capability which is context-aware and a mobile agent mechanism are part of this system design. The intelligent agent based system can deliver patient-specific information and other medical data to the service provider in real time. MedNet is perceived to bring in significant advantages in providing seamless, directed information to MSPs. © 2004 IEEE.

关键词： Patient treatment

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Synthesis of an event based deadlock avoidance supervisor for semiconductor manufacturing systems with choices in process flows

Synthesis of an event based deadlock avoidance supervisor fo...

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2004 43rd IEEE Conference on Decision and Control (CDC)

作者： Zhang, Wenle Mao, Ziqiang John Sch. of Elec. Eng. and Comp. Science Ohio University Athens OH 45701 United States Intel Corporation Technology Manufacturing Engineering 2200 Mission College Blvd. Santa Clara CA 95052 United States

With the emerging of highly automated and flexible manufacturing systems in semiconductor fabrication, reliability and optimal productivity of such systems require very intelligent and complex control systems. Deadlock issue arises easily in these systems due to shared equipment usage and high production flexibility. This paper extends the event-based deadlock avoidance supervisor for semiconductor manufacturing systems from scenario without choices in process flows to cases with choices which are common in modern manufacturing systems. To allow choices in process flows improves operational flexibility of these systems, it also requires more sophisticated supervisory control techniques. Built upon a directed graph model of process flows, the extended supervisor is able to efficiently avoid the deadlock state space explosion problem. Concepts such as compound events, operation strings and deadlock strings are restated. New concepts such as broken circuits, choice circuits, split events, merge events and so on are introduced. These concepts help to dramatically decrease the number of circuits that the supervisor has to check thus increasing efficiency of the method. Major features in the proposed method include: i) it enables the optimal deadlock free operation of regular systems;and ii) it runs in polynomial time (fast online computation) provided that the set of deadlock strings is calculated offline. Examples are provided to show the effectiveness of the method.

关键词： Semiconductor device manufacture

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Supervisory control of real-time discrete event systems under bounded time constraints

Supervisory control of real-time discrete event systems unde...

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作者： Park, S.-J. Cho, K.-H. Lim, J.-T. Sch. of Elec./Computer Engineering Ajou University Suwon 442-749 Korea Republic of School of Electrical Engineering University of Ulsan Ulsan 680-749 Korea Republic of Department of Electrical Engineering Korea Adv. Inst. of Sci./Technology Taejon 305-701 Korea Republic of

An analytical framework for supervisory control of real-time discrete event systems (DESs) under bounded time constraints is presented. In order to address the bounded time constraints of the systems, timed languages based on timed transition models are introduced. Using eligible time bounds, the notions of trace-controllability and time-controllability of timed languages are proposed. Based on these notions, necessary and sufficient conditions for the existence of a supervisor for a real-time DES to achieve the given timed language specification are presented. The proposed approach shows that an exhaustive enumeration of the language generated in timed transition models is not needed to verify such existence conditions of the supervisor.

关键词： Discrete time control systems

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RF SoP for Multi-band RF and Millimeter-wave Systems

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Advanced Packaging 2004年第4期13卷 15-16页

作者： Tentzeris, M.M. Laskar, J. Papapolymerou, J. Thompson, D. Pinel, S. Li, R.L. Lee, J.H. Dejean, G. Sarkar, S. Pratap, R. Bairavasubramanian, R. Papageorgiou, N. Georgia Tech's Packaging Res. Center Sch. of Elec./Computer Engineering Georgia Institute of Technology Atlanta GA 30332-0269

The developments made on the system-on-package (SoP) concept for multiband radiofrequency and millimeter wave systems by Georgia Tech's Packaging Reseach Center are discussed. The SoP is found to be a more feasible, low cost solution than the system of chip (SoC) approach. Although cost, elec.rical performance, integration density and packaging capability are often at odds with each other in radio frequency designs, the SoP design strategy is found to satisfy these variables simultaneously. The developments made on advanced multilayer organic substrates using FR4 and advanced materials such as LCP, and low temperature corified ceramics (LTCC) are also discussed.

关键词： Packaging

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