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International Conference on Software, Telecommunications and computer Networks (SoftCOM)

作者： Christos Bouras Apostolos Gkamas Georgios Kioumourtzis Computer Engineering and Informatics Department & Research Academic Compute Technology Institute University of Patras Rion Greece

ISBN: (纸本)9781424449736

Multi-rate multicast schemes can be broadly classified into two categories. In layered multicast, a video file is transmitted by a base layer, which contains the most important features of the video. Additional layers, called enhancement layers, contain data that refine the quality of the base layer. In simulcast, the video file is transmitted by replicated layers that contain the same content at different quality. The benefits of layered multicast versus simulcast are still under question, as layered multicast presents higher complexity and more challenging deployment than simulcast. In this paper, two multi-rate multicast control schemes are compared. The layered multicast SMCC congestion control against our proposed solution for simulcast transmission, named ASSP. We compare the two schemes under a controlled simulation environment with the network simulator software (ns-2) by taking into account the evaluation criteria in RFC 5166. The results demonstrate that both SMCC and ASSP are TCP-friendly while SMCC seems to suffers from small oscillations of the transmission rate. In network topologies with low complexity ASSP consumes no more bandwidth than SMCC for the transmission of the different simulcast streams, while being a simpler solution than the more complicated SMCC.

关键词： Streaming media Multicast protocols Bandwidth computer networks informatics Electronic mail Network topology Video coding Static VAr compensators Encoding

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Management of uncomplicated urinary tract infections using fuzzy cognitive maps

Management of uncomplicated urinary tract infections using f...

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IEEE EMBS International Conference on Information technology Applications in Biomedicine (ITAB)

作者： E.I. Papageorgiou Chris Papadimitriou S. Karkanis Department of Informatics and Computer Technology Technological Educational Institute of Lamia Greece Department of Informatics with apllications in Biomedicine University of Central Greece Lamia Greece

Urinary Tract Infection (UTI) is a bacterial infection that affects any part of the urinary tract. It can be classified as uncomplicated (patients with urinary tracts that are normal from both structural and functional perspective) and complicated. The treatment of uncomplicated urinary tract infections is a complex medical task where a number of parameters, tests, symptoms and laboratory results are present. The knowledge of physicians according to the symptoms and clinical measurements are the main point to succeed a diagnosis, suggest a therapeutic treatment and monitoring patient status. This paper presents the results of our investigation on the problem of handling medical knowledge for decision making by using the soft computing technique of fuzzy cognitive maps. The fuzzy cognitive map (FCM) is an efficient technique for modeling and representing experts' knowledge. Due to its easy graphical representation and simulation process the proposed FCM can be used to make the medical knowledge widely available through computer consultation systems.

关键词： Fuzzy cognitive maps Medical diagnostic imaging Medical treatment Bacterial infections Medical tests Laboratories Patient monitoring Biomedical monitoring Decision making Computational modeling

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Performance Evaluation for Multistage Interconnection Networks Servicing Multicast Traffic

Performance Evaluation for Multistage Interconnection Networ...

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International Conference on Advances in Future Internet

作者： John Garofalakis Eleftherios Stergiou Department of Computer Engineering and Informatics Research Academic Computer Technology Institute University of Patras Patras Greece Department Teleinformatics and Communication ATEI of Epirus Arta Greece

Multistage Interconnection Networks (MINs) provide efficient communication resources between network components in an appealing cost/performance relation. Consequently, they have been widely used on Internet connections such as ATM and gigabit Ethernet switches, terabit routers as well as for interconnecting parallel systems. In this paper a novel analytical method for providing performance evaluation on MINs is presented under multicast environment. The proposed analysis was applied on various network size MINs constructed by variable buffer-length switching elements (SEs) per network stage, supporting mixed traffic patterns such as unicast and multicast, under various offered loads in uniform traffic conditions. The applied multicasting policy, where a packet is copied and transmitted when only both destination buffers are available has not been considered insofar by former models. This mechanism, which is called "full-multicast" was employed by all SEs using the "cell replication while routing" (CRWR) *** proposed architecture, which is thoroughly analyzed by our novel analytical model, can be also useful in performance study and development of other Internet communication links supporting multicast traffic.

关键词： Multiprocessor interconnection networks Telecommunication traffic Traffic control Internet Performance analysis Costs Asynchronous transfer mode Ethernet networks Switches Communication switching

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computer visual-auditory diagnosis of speech non-fluency

Advances in Intelligent and Soft Computing

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Advances in Intelligent and Soft Computing 2009年 57卷 35-42页

作者： Dzieńkowski, Mariusz Kuniszyk-Jóźkowiak, Wieslawa Smolka, Elżbieta Suszyński, Waldemar Department of Informatics Systems Lublin University of Technology Poland Department of Biocybernetics Institute of Computer Science Maria Curie-Sklodowska University Lublin Poland

The paper focuses on the visual-auditory method of analysis for utterances of stuttering people. The method can be classified as an intermediate solution which is in between a traditional auditory and automatic methods. The author prepared a special computer program DiagLog, with the aim of carrying out the visual-auditory analysis, which can be used by logopaedists to make a diagnosis. The speech disfluencies are assessed by means of the observation of the spectrum and the envelope of fragments of recordings with simultaneous listening to them. A collection of 120 a few-minute recordings of 15 stuttering people was used to verify the correctness of the method and to compare it with the traditional auditory technique. All the samples were analysed by means of the auditory and the visual-auditory method by two independent experts. Consequently, the diagnosis using an additional visual aspect proved itself to be more effective in detecting speech non-fluencies, in classifying and measuring them. © Springer-Verlag Berlin Heidelberg 2009.

关键词： Speech recognition

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Code4Thought Project: Employing the ISO/IEC-9126 Standard for Software Engineering-Product Quality Assessment

Code4Thought Project: Employing the ISO/IEC-9126 Standard fo...

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(CSMR) European Conference on Software Maintenance and Reengineering

作者： Panos Antonellis Dimitris Antoniou Yiannis Kanellopoulos Christos Makris Christos Tjortjis Vangelis Theodoridis Nikos Tsirakis Department of Computer Engineering and Informatics University of Patras Greece School of Computer Science and Technology University of Manchester Institute of Science and Technology UK University of Western Macedonia Greece

The aim of the Code4Thought project was to deliver a tool supported methodology that would facilitate the evaluation of a software product's quality according toISO/IEC-9126 software engineering quality standard. It was a joint collaboration between Dynacomp S.A. and the Laboratory for Graphics, Multimedia and GIS of the department of computer Engineering and informatics of the University of Patras. The Code4thought project focused its research on extending the ISO/IEC-9126standard by employing additional metrics and developing new methods for facilitating system evaluators to define their own set of evaluation attributes. Furthermore, to develop innovative and platform-free methods for the extraction of elements and metrics from source code ***, to design and implement new data mining algorithms tailored for the analysis of software engineering data.

关键词： ISO standards Code standards Software standards Software quality Quality assessment Software engineering Data mining Algorithm design and analysis Software tools Collaboration

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Evaluation of Single Rate Multicast Congestion Control Schemes for MPEG-4 Video Transmission

Evaluation of Single Rate Multicast Congestion Control Schem...

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Conference on Next Generation Internet Networks, NGI

作者： Christos Bouras Apostolos Gkamas Georgios Kioumourtzis Computer Engineering and Informatics Department University of Patras Greece Scientific Coordinator of Research Unit 6 Research Academic Computer Technology Institute Patras Greece

We present in this paper a simulation-based comparison of one of the best known multicast congestion control schemes - TFMCC - against our proposed adaptive smooth multicast protocol (ASMP). ASMP consists of a single-rate multicast congestion control, which takes advantage of the RTCP sender (SR) and receiver reports (RR) in order to adjust the sender's transmission rate in respect of the network conditions. The innovation in ASMP lays in the "smooth" transmission rate, which is TCP-friendly and prevent oscillations. We use an integrated simulation environment named Multi-Evalvid-RA for the evaluation of the two congestion control schemes. Multi-Evalvid-RA provides all the necessary tools to perform simulation studies and assess the video quality by using both network related metrics along with video quality measurements. The performance evaluation results show that ASMP is a very efficient solution for rate adaptive multimedia applications and a serious competitor to well know TFMCC.

关键词： MPEG 4 Standard Multicast protocols Video on demand informatics Computational modeling PSNR Paper technology Telecommunication traffic Traffic control Programmable control

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A smart home application to eldercare: Current status and lessons learned

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technology and Health Care 2009年第3期17卷 183-201页

作者： Skubic, Marjorie Alexander, Gregory Popescu, Mihail Rantz, Marilyn Keller, James Electrical and Computer Engineering Department University of Missouri Columbia MO United States Sinclair School of Nursing University of Missouri Columbia MO United States Department of Health Management and Informatics University of Missouri Columbia MO United States Informatics Institute University of Missouri Columbia MO United States Center for Eldercare and Rehabilitation Technology University of Missouri Columbia MO United States

To address an aging population, we have been investigating sensor networks for monitoring older adults in their homes. In this paper, we report ongoing work in which passive sensor networks have been installed in 17 apartments in an aging in place eldercare facility. The network under development includes simple motion sensors, video sensors, and a bed sensor that captures sleep restlessness and pulse and respiration levels. Data collection has been ongoing for over two years in some apartments. This longevity in sensor data collection is allowing us to study the data and develop algorithms for identifying alert conditions such as falls, as well as extracting typical daily activity patterns for an individual. The goal is to capture patterns representing physical and cognitive health conditions and then recognize when activity patterns begin to deviate from the norm. In doing so, we strive to provide early detection of potential problems which may lead to serious health events if left unattended. We describe the components of the network and show examples of logged sensor data with correlated references to health events. A summary is also included on the challenges encountered and the lessons learned as a result of our experiences in monitoring aging adults in their homes. © 2009 IOS Press and the authors. All rights reserved.

关键词： Eldercare technology Passive monitoring Sensor networks Smart home Video sensor network

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Adaptive Task Scheduling in Grid Computing Environments

Adaptive Task Scheduling in Grid Computing Environments

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International Workshop on Semantic Media Adaptation and Personalization (SMAP)

作者： Angelos Michalas Malamati Louta Department of Informatics and Computer Technology Technological Educational Institute of Western Macedonia Kastoria Greece Department of Informatics and Telematics Harokopio University of Athens Athens Greece

In this study the task scheduling problem in Grid computing environments has been addressed. To resolve the problem a set of Grid Services are defined and implemented conforming to the OGSA standards. The proposed scheduling architecture is semantically enhanced and provides the most appropriate assignment of tasks to computing resources, given the current load conditions of each computing resource and the network status. The Ant Colony Optimization algorithm (ACO) was used to effectively assign tasks to computing resources. First experimental results indicate that the proposed framework produces good results in comparison to other well known schemes considered (e.g. round robin).

关键词： Adaptive scheduling Processor scheduling Grid computing computer networks Distributed computing computer architecture Cloud computing Peer to peer computing Service oriented architecture Resource management

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On a Small Gain Theorem for Networks of iISS Systems

On a Small Gain Theorem for Networks of iISS Systems

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Joint 48th IEEE Conference on Decision and Control and 28th Chinese Control Conference

作者： Hiroshi Ito Sergey Dashkovskiy Fabian Wirth the Department of Systems Design and Informatics Kyushu Institute of Technology the Department of Mathematics and Computer Science University of Bremen the Institute of Mathematics University of W rzburg

This paper considers networks consisting of integral input-to-state stable(i ISS) subsystems and addresses the problem of verifying i ISS property of a given ***, we focus on construction of continuously differentiable Lyapunov functions, and derive a condition ensuring the i ISS of the network comprising n subsystems. Although this approach referred to as the sum-type construction has not yet been reduced to an easily computable condition for general n,the n = 2 case recovers the i ISS small-gain condition for two subsystems developed recently. Next, in the case of n subsystems, using Lipschitz continuous Lyapunov functions,this paper derives a small-gain condition. It is shown that this second approach referred to as the max-type construction fails to offer a Lyapunov function if there exist subsystems which are not input-to-state stable(ISS). The relation between the two formulations is discussed in the case of two ISS subsystems.

关键词： ISS Lyapunov On a Small Gain Theorem for Networks of iISS Systems

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Proceeding of the ACM International Conference on Image and Video Retrieval ACM-CIVR 2009: Foreword

CIVR 2009 - Proceedings of the ACM International Conference ...

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CIVR 2009 - Proceedings of the ACM International Conference on Image and Video Retrieval 2009年 1-1页

作者： Kompatsiaris, Yiannis Marchand-Maillet, Stéphane Informatics and Telematics Institute Centre for Research and Technology Hellas Viper Group Computer Science Department University of Geneva Switzerland

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