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3rd IEEE International Symposium on Intelligent Signal Processing, WISP 2003

作者： Papandreou, Nikolaos Antonakopoulos, Theodore Academic Research Computer Technology Institute - CTI 61 Riga Feraiou Str. Patras26100 Greece Department of Electrical Engineering and Computers Technology University of Patras Rio Patras26500 Greece

ISBN: (纸本)0780378644

FEXT crosstalk identification results to improved frequency spectrum utilization in ADSL systems. The accurate determination of the crosstalk transfer function is a demanding task that is affected by various system impairments. In this paper we investigate the performance of a real-time method that exploits the exchange of signaling information of a new activated ADSL line in order to determine the crosstalk function between this line and an existing operational line. ©2003 IEEE.

关键词： Transfer functions

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Integrating adaptive web techniques with web services

Integrating adaptive web techniques with web services

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International Conference on Information technology - Coding and Computing

作者： Garofalakis, J Sakkopoulos, E Sirmakessis, S Tsakalidis, A RA Computer Technology Institute Internet and Multimedia Technologies Research Unit 61 Riga Feraiou Str. 26110 Greece University of Patras Computer Engineering and Informatics Department Patras 26500 Greece Hellenic Open University 84 K Palama Str. Patras 26442 Greece

ISBN: (纸本)0769519164

Enterprise software infrastructure traditionally comprises a number of independent systems in order to support customer needs and business processes complicating this way productivity, performance and maintenance. Instead there are hypermedia facilities based on widespread standards that provide over a user-friendly, well-known framework richer functionality and features. In the paper, we present the design, implementation and evaluation of the combined use of web services and adaptive web-based techniques. We describe a large-scale hypermedia framework that improves the efficiency and performance of conventional enterprise activities like customer services (registration, activation, billing, support) and document management. The presented approach aims to cover these fundamental needs for a network of customers, collaborators and intranet employees.

关键词： Web services

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Integrating adaptive Web techniques with Web services

Integrating adaptive Web techniques with Web services

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International Conference on Information technology: Coding and Computing (ITCC)

作者： J. Garofalakis E. Sakkopoulos S. Sirmakessis A. Tsakalidis Computer Engineering & Informatics Department University of Patras Patras Greece Technologies Research Unit Research Academic Computer Technology Institute Greece Hellenic Open University Patras Greece

Enterprise software infrastructure traditionally comprises a number of independent systems in order to support customer needs and business processes complicating productivity, performance and maintenance. Instead there are hypermedia facilities based on widespread standards that provide over a user-friendly, well-known framework richer functionality and features. In the paper, we present the design, implementation and evaluation of the combined use of Web services and adaptive Web-based techniques. We describe a large-scale hypermedia framework that improves the efficiency and performance of conventional enterprise activities like customer services (registration, activation, billing, support) and document management. The presented approach aims to cover these fundamental needs for a network of customers, collaborators and intranet employees.

关键词： Web services Information technology

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Formation, routing, and maintenance protocols for the BlueRing scatternet of Bluetooths 36

Formation, routing, and maintenance protocols for the BlueRi...

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36th Annual Hawaii International Conference on System Sciences, HICSS 2003

作者： Lin, Ting-Yu Tseng, Yu-Chee Chang, Keng-Ming Tu, Chun-Liang Department of Computer Science and Information Engineering National Chiao-Tung University Hsin-Chu300 Taiwan Department of Computer Science and Information Engineering National Central University Chung-Li320 Taiwan CCL Industrial Technology Research Institute Taiwan

ISBN: (纸本)0769518745

The basic networking unit in Bluetooth is piconet, and a larger-area Bluetooth network can be formed by multiple piconets, called scatternet. However, the structure of scatternets is not defined in the Bluetooth specification and remains as an open issue at the designers' choice. It is desirable to have simple yet efficient scatternet topologies with well supports of routing protocols, considering that Bluetooths are to be used for personal-area networks with design goals of simplicity and compactness. In the literature, although many routing protocols have been proposed for mobile ad hoc networks, directly applying them poses a problem due to Bluetooth's special baseband and MAC-layer features. In this work, we propose an attractive scatternet topology called BlueRing which connects piconets as a ring interleaved by bridges between piconets, and address its formation, routing, and topology maintenance protocols. The BlueRing architecture enjoys the following nice features. First, routing on BlueRing is stateless in the sense that no routing information needs to be kept by any host once the ring is formed. This would be favourable for environments such as Smart Homes where computing capability is limited. Second, the architecture is scalable to median-size scatternets easily (e.g., around 50∼70 Bluetooth units). In comparison, most star- or tree-like scatternet topologies can easily form a communication bottleneck at the root of the tree as the network enlarges. Third, maintaining a BlueRing is an easy job even as some Bluetooth units join or leave the network. To tolerate single-point failure, we propose a protocol-level remedy mechanism. To tolerate multi-point failure, we propose a recovery mechanism to reconnect the BlueRing. Graceful failure is tolerable as long as no two or more critical points fail at the same time. As far as we know, the fault-tolerant issue has not been properly addressed by existing scatternet protocols yet. In addition, we also evaluate t

关键词： Topology

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A Novel Adaptive Control System for Raw Material Blending

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IEEE Control Systems 2003年第1期23卷 87-96页

作者： Banyasz, Cs Keviczky, L. Vajk, Istvan Computer and Automation Research Institute Hungarian Academy of Sciences H-1111 Budapest Kende u 13-17 Hungary Department of Automation and Applied Informatics Budapest University of Technology and Economics H-1111 Budapest Hungary

We discuss a new generic optimal controller structure for raw material blending in the cement industry. We focus on an important phase of the proportioning-burning-grinding operation triplet that essentially determines the cement quality; namely, the composition control of the raw mill system. We begin by describing the application of a generic optimal controller structure to this important phase, followed by a discussion of the control engineering background and the design of the realized controller. Finally, the control algorithm is discussed in a technology-independent manner.

关键词： Adaptive control Raw materials Building materials Automation Material storage Optimal control Milling machines Production facilities Automatic control Proportional control

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A sleep-awake protocol for information propagation in smart dust networks

A sleep-awake protocol for information propagation in smart ...

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International Symposium on Parallel and Distributed Processing (IPDPS)

作者： I. Chatzigiannakis S. Nikoletseas Computer Engineering and Informatics Department University of Patras Patras Greece Computer Technology Institute Patras Greece

Smart dust is a set of a vast number of ultra-small fully autonomous computing and communication devices, with very restricted energy and computing capabilities, that co-operate to quickly and efficiently accomplish a large sensing task. Smart dust can be very useful in practice i.e. in the local detection of a remote crucial event and the propagation of data reporting its realization. In this work we continue our effort towards the research on smart dust from a basic algorithmic point of view. Under a simple but realistic model for smart dust we present an interesting problem, which is how to propagate efficiently information on an event detected locally. Then we present anew smart dust protocol, which we call the "Sleep-Awake" protocol, for information propagation that explicitly uses the energy saving features (i.e. the alteration of sleeping and awake time periods) of the smart dust particles. By using both some simple probabilistic analysis and extensive experiments, we provide some first concrete results for the success probability and the time and energy efficiency of the protocol, in terms of parameters of the smart dust network. We note that the study of the interplay of these parameters allows us to program the smart dust network characteristics accordingly.

关键词： Protocols Intelligent networks Intelligent sensors Vehicle dynamics Event detection Sensor systems computer networks Temperature sensors Sensor phenomena and characterization Remote monitoring

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A scalable, low-cost VoD server with multicast support

A scalable, low-cost VoD server with multicast support

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International Conference on Information technology: research and Education (ITRE)

作者： A. Papagiannis S. Egglezos D. Lioupis Department of Computer Engineering & Informatics University of Patras Patras Greece Computer Technology Institute Patras Greece

Undoubtedly, video-on-demand technology will play a catalytic role in future entertainment and e-learning systems. The key challenge in VoD domain is to provide interactive services in thousands of potential users at a reasonable cost. We present a scalable, high performance, high availability and low cost VoD system design, based on a cluster of personal computer. The scalability of this design is not restricted to cluster-level, but it can easily be applied to a greater MAN-level. The experimental measurements indicated that our design can support simultaneously 90, 170 or 240 high quality video streams for implementations with 1, 2 or 3 server nodes respectively. We show, using queuing theory analysis that these figures correspond to thousands of real users. We also present a multicast method that further enriches our design increasing its reliability in periods of high demand.

关键词： Scalability Switches Costs Availability Microcomputers Video on demand Control systems Load management Communication switching informatics

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Design conditions for Space Vector Modulated three-phase converter to avoid instability

Design conditions for Space Vector Modulated three-phase con...

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2003 IEEE Bologna PowerTech Conference

作者： Süto, Z. Nagy, I. Department of Automation and Applied Informatics Budapest University of Technology and Economics Budafoki út 8 Budapest H-1111 Hungary Computer and Automation Research Institute Hungarian Academy of Science Budapest Hungary

ISBN: (纸本)0780379675

The analysis, design aspects and numerical results of a current controlled three-phase Space Vector Modulated (SVM) Voltage Source Converter (VSC) are presented. The aim of the current controller of VSC is to track the balanced three-phase sinusoidal reference currents. The current controller includes a complex saturation function in order to avoid overmodulation in the SVM, Due to this strong nonlinearity the study leads to rather unexpected system states. An approximate Poincare map is derived using stroboscopic sampling with the modulation period of the SVM. Selecting eigenvalues of the system linearized around the desired fixed point is not sufficient to the proper operation. Other stable fixed points or limit cycles can appear. Chaotic states also can develop in the unstable region of the desired fixed point. The main objectives are to develop the tools for describing the nonlinear behavior, for designing the digital PI controller and to present numerical results. © 2003 IEEE.

关键词： Electric current control

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xDSL systems prototyping using a flexible emulation environment

xDSL systems prototyping using a flexible emulation environm...

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International Workshop on Rapid System Prototyping (RSP)

作者： N. Papandreou M. Varsamou T. Antonakopoulos Academic Research Computer Technology Institute Patras Greece Department of Electrical Engineering University of Patras Patras Greece

In this paper we describe the methodology and architecture of a flexible modular environment for prototyping data transmission systems and its application on xDSL systems. The development environment is based on custom and commercially available software tools and a custom hardware emulation platform for mapping the basic data-pump modules of xDSL systems into hardware/software functional modules. The road-map from a high-level xDSL system model to the actual prototype is based on the progressive substitution of high-level submodules of the initial model with their respective hardware/software counterparts, and their integration into a complete functional system. A library of custom blocks is used for data exchange and synchronization between the high-level model and the emulation platform, and for real-time visualization of the critical parameters of the emulated system as well. The application of the proposed development environment in the implementation and testing of an emulator of a bundle of DSL lines and of a centralized bit-loading algorithm for multicarrier ADSL systems is also described.

关键词： Prototypes Emulation Software prototyping Hardware Application software Software tools computer architecture Data communication Software libraries Real time systems

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Architecture template and design flow to support application parallelism on reconfigurable platforms

Architecture template and design flow to support application...

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13th International Conference on Field-Programmable Logic and Applications, FPL 2003

作者： Sawitzki, Sergei Spallek, Rainer G. Philips Research Laboratories Prof. Holstlaan 4 Eindhoven5656AA Netherlands Institute of Computer Engineering Department of Computer Science Dresden University of Technology Dresden01062 Germany

ISBN: (纸本)3540408223

This paper introduces the ReSArT (Reconfigurable Scalable Architecture Template). Based on a suitable design space model, Re- SArT is parametrizable, scalable, and able to support all levels of parallelism. To derive architecture instances from the template, a design environment called DEfInE (Design Environment for ReSArT Instance Generation) is used, which integrates some existing academic and industrial tools with ReSArT-specific components, developed as a part of this work. Different architecture instances were tested with a set of 10 benchmark applications as a proof of concept, achieving a maximum degree of parallelism of 30 and an average degree of parallelism of nearly 20 16-bit operations per cycle. © Springer-Verlag Berlin Heidelberg 2003.

关键词： Benchmarking

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