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International Symposium on Multimedia Software engineering

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

Video-on-demand systems will be the video rental shops of the future. One of the great challenges in the VoD domain is optimizing the cost/performance ratio of the designed system. We present a clustered, high performance, high availability and low cost VoD system, which is based on a network of personal computers. We experimented with state-of-the-art video compression algorithms like MPEG-4, although our system is video format independent. We succeeded in serving 90 near DVD quality streams per node, with great potential for expansion. We show that the key factor of this success is the migration of performance demanding procedures to clients of the system, which possess the appropriate processing power to support them. Furthermore, we present the results of our experiments with systems of 2 and 3 server nodes that prove the linearity between the number of server nodes and the number of served streams.

关键词： Network servers Microcomputers Video compression Design optimization Cost function Availability Clustering algorithms MPEG 4 Standard DVD Streaming media

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An adaptive compulsory protocol for basic communication in highly changing ad-hoc mobile networks

An adaptive compulsory protocol for basic communication in h...

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International Symposium on Parallel and Distributed Processing (IPDPS)

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

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A ROMless LFSR reseeding scheme for scan-based BIST

A ROMless LFSR reseeding scheme for scan-based BIST

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Asian Test Symposium (ATS)

作者： E. Kalligeros X. Kavousianos D. Nikolos Department of Computer Engineering & Informatics University of Patras Patras Greece Computer Technology Institute Patras Greece

In this paper, we present a new LFSR reseeding scheme for scan-based BIST, suitable for circuits with random-pattern-resistant faults. The proposed scheme eliminates the need of a ROM for storing the seeds since the reseedings are performed dynamically by inverting some selected bits of the LFSR register. A time-to-market efficient algorithm is also presented for selecting the reseeding points in the test sequence, as well as a proper seed at each point. This algorithm targets complete fault coverage and minimization of the resulting test length and hardware overhead. Experimental results on ISCAS '85 and ISCAS '89 benchmark circuits demonstrate the advantages of this new LFSR reseeding approach in terms of area overhead and test application time.

关键词： Built-in self-test Testing

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Evolutionary self-adaptive multimodel prediction algorithms of the fetal magnetocardiogram 14

Evolutionary self-adaptive multimodel prediction algorithms ...

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14th International Conference on Digital Signal Processing, DSP 2002

作者： Adamopoulos, A.V. Anninos, P.A. Likothanassis, S.D. Beligiannis, G.N. Skavlas, L.V. Demiris, E.N. Papadopoulos, D. Department of Medicine Medical Physics Laboratory Democritus University of Thrace AlexandroupolisGR-68100 Greece Department of Computer Engineering and Informatics Laboratory of Pattern Recognition University of Patras PatrasGR-26500 Greece Computer Technology Institute 3 Kolokotroni str. PatrasGR-26222 Greece

ISBN: (纸本)0780375033

A novel technique for the analysis, nonlinear model identification and prediction of the fetal Magneto Cardio Gram (f-MCG) is presented. f-MCGs can be recorded with the use of specific totally non-invasive Superconductive Quantum Interference Devices (SQUID). For the analysis and classification of the f-MCG signals we introduce an intelligent method that combines the following well known advanced signal processing techniques: The Genetic Algorithms (GA), the Multi Model Partitioning (MMP) theory and the Extended Kalman Filters (EKF). Simulations illustrate that the proposed method is selecting the correct model structure and identifies the model parameters m a sufficiently small number of iterations and tracks successfully changes in the signal, in real time. The information provided by the proposed analysis is easily interpreted and assessed by gynecologists and is consisted to the clinical status of the fetus. The proposed algorithm can be parallel implemented and also a VLSI implementation is feasible. © 2002 IEEE.

关键词： Magnetos

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Enhancing the DiffServ architecture of a simulation environment

Enhancing the DiffServ architecture of a simulation environm...

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International Workshop/Symposium on Distributed Simulation and Real-Time Applications (DS-RT)

作者： C. Bouras D. Primpas A. Sevasti A. Varnavas Department of Computer Engineering and Informatics University of Patras Patras Greece Research Academic Computer Technology Institute Patras Greece

Simulation has always been a valuable tool for experimentation and validation of models, architectures and mechanisms in the field of networking. In the case of the DiffServ framework, simulation is even more valuable, due to the fact that an analytical approach of mechanisms and services is infeasible because of the aggregation and multiplexing of flows. In this work, we have extended the functionality of a widely used simulation environment towards the direction of realistic traffic generation and a series of mechanisms defined by the DiffServ architecture. The modules created are being presented and a case study of a simulation scenario that exploits the functionality provided by them is described.

关键词： Diffserv networks Traffic control Computational modeling computer architecture computer simulation Aggregates computer networks Testing Communication system traffic control informatics

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Updating a hybrid rule base with new empirical source knowledge

Updating a hybrid rule base with new empirical source knowle...

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International Conference on Tools for Artificial Intelligence (ICTAI)

作者： J. Prentzas I. Hatzilygeroudis A. Tsakalidis School of Engineering Department of Computer Engin. & Informatics University of Patras Patras Greece Computer Technology Institute Patras Greece

Neurules are a kind of hybrid rules that combine a symbolic (production rules) and a connectionist (adaline unit) representation. Each neurule is represented as an adaline unit. One way that the neurules can he produced is from training examples (empirical source knowledge). However, in certain application fields not all of the training examples are available a priori. A number of them become available over time. In these cases, updating the corresponding neurules is necessary. In this paper, methods for updating a hybrid rule base, consisting of neurules, to reflect the availability of new training examples are presented The methods are efficient, since they require the least possible retraining effort and the number of the produced neurules is kept as small as possible.

关键词： Neural networks Production Expert systems Intelligent agent Intelligent robots Knowledge engineering informatics Knowledge representation Hybrid intelligent systems User interfaces

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Colour image authentication based on a self-embedding technique

Colour image authentication based on a self-embedding techni...

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International Conference on Digital Signal Processing (DSP)

作者： I. Kostopoulos S.A.M. Gilani A.N. Skodras Computer Engineering & Informatics Department University of Patras Greece Computer Technology Institute Greece Electronics Laboratory University of Patras Greece

In the paper an approach for digital image authentication is described. The authentication process is achieved by means of a watermarking scheme that embeds an approximation of the image into itself. Specifically, the luminance of the image is inserted into the three colour channels, using a mapping function. The embedding process is implemented using a secret key k that maps the position of the pixel, where the luminance information is taken from, to the position of the pixel in which the watermark information is embedded. The quality of the watermarked images remains very high both subjectively and objectively. The proposed approach belongs to the category of semi-fragile techniques used for image authentication.

关键词： Authentication Watermarking Digital images Protection Software libraries informatics Laboratories Cultural differences Image retrieval Large-scale systems

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Nonsingular terminal sliding mode control of a class of nonlinear dynamical systems 15th

Nonsingular terminal sliding mode control of a class of nonl...

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15th World Congress of the International Federation of Automatic Control, 2002

作者： Yu, Xinghuo Zhihong, Man Feng, Yong Guan, Zhihong Faculty of Informatics and Communication Central Queensland University RockhamptonQLD4702 Australia School of Computer Engineering Nanyang Technological University Singapore Singapore Department of Electrical Engineering Harbin Institute of Technology Harbin150006 China Department of Control Science and Engineering Huazhong University of Science and Technology Wuhan Hubei430074 China

ISBN: (纸本)9783902661746

In this paper, a nonsingular terminal sliding mode concept is introduced for the control of a class of nonlinear dynamical systems. This nonsingular terminal sliding mode control not only enables the Lnite time convergence of the system equilibrium, but also eliminates the singularity problem associated with conventional terminal sliding mode control. Simulations are presented to show the effectiveness of the design. Copyright © 2002 IFAC.

关键词： Sliding mode control

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Modelling resource management for multi-class traffic in mobile cellular networks

Modelling resource management for multi-class traffic in mob...

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Annual Hawaii International Conference on System Sciences (HICSS)

作者： H. Hlavacs G. Haring A. Kamra M. Bansal Institute for Computer Science and Business Informatics University of Technology Vienna Vienna Austria Department of Computer Science and Engineering Indian Institute of Technology Delhi New Delhi India

ISBN: (纸本)0769514359

Future cellular mobile networks will be limited by the number of channels available in each cell. On the other hand, new broadband applications like video telephony will demand tight quality of service guarantees that must be met by the network at all times. Thus, advanced mechanisms for allocating these channels to incoming calls with different quality of service level will be of utmost importance. In this paper we introduce a new analytical model for cell channel allocation to multiclass traffic. Being based on Markov chains, the new model exploits the multi-class property and reduces the state space dramatically, thus enabling the solution of previously unsolvable problem classes. We additionally describe CECALL, a simulator implementing several different strategies for allocating cell channels to multiclass traffic, handoff pre-reservation and degradation of low-level call classes. The results of the analytical model are used for explaining important simulation results.

关键词： Resource management Telecommunication traffic Traffic control Land mobile radio cellular systems Analytical models Quality of service Cellular networks Telephony Channel allocation State-space methods

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e-management of supply chain: General models taxonomy

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Human Systems Management 2002年第2期21卷 95-113页

作者： Chandra, Charu Kumar, Sameer Smirnov, Alexander V. Industrial and Manufacturing Systems Engineering Department College of Engineering and Computer Science University of Michigan - Dearborn 4901 Evergreen Road Dearborn MI 48128-1491 United States Department of Engineering and Technology Management University of St. Thomas Mail #OSS 101 2115 Summit Avenue St. Paul MN 55105-1079 United States St. Petersburg Institute for Informatics and Automation Russian Academy of Sciences 39 14th line St. Petersburg 199178 Russia

The management of Supply Chain Systems is one of the major issues that a firm has to deal with in today's global economy. The purpose of this type of system is to transform incomplete information about the market and available resources into co-ordinated plans for production and replenishment of goods and services in the network formed by co-operating units. One of the goals of Internet-Based Management (e-management) is to facilitate transfer and sharing of data and knowledge in the context of supply chain structures. Knowledge-based modelling tools for supply chain management utilise reusable components and configure knowledge as needed, in order to assist users (agents) in decision-making. This paper discusses a generic development methodology for e-management and conceptual modelling of supply chains. For illustration, applications from the automotive industry have been utilised.

关键词： Industrial management

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