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Building e-learning communities: the case of VirRAD

Building e-learning communities: the case of VirRAD

引用

International Conference on Advanced Learning Technologies (ICALT)

作者： Ch. Bouras El. Giannaka V. Kapoulas M. Nani Th. Tsiatsos Computer Engineering and Informatics Department (CEID) University of Patras Greece Research Academic Computer Technology Institute Greece

We discuss the development of virtual communities and especially e-learning communities. In particular, we are inspired by VirRAD European project, and we present the intermediate results that have raised from the def... 详细信息

关键词： Electronic learning computer aided software engineering computer aided instruction Courseware Collaborative work informatics Environmental economics Virtual reality Vocational training Professional communication

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Blind image-adaptive watermarking

Blind image-adaptive watermarking

引用

IEEE International Conference on Electronics, Circuits and Systems (ICECS)

作者： I. Karybali K. Berberidis Department of Computer Engineering and Informatics and Research Academic Computer Technology Institute / Research and Development University of Patras Rio-Patras Greece

In this paper a new blind image-adaptive watermarking technique is proposed. The main contributions in this work are the following. First, a new spatial mask taking into account the Human Visual System (HVS) properties, is proposed. The mask is constructed based on the local variance of the cover image prediction error sequence. Second, an improved detection scheme has been developed, which is blind, in the sense that no knowledge concerning the cover image is required. The similarity measure used in the detector is the normalized correlation between the reproduced watermark and the prediction error of the watermarked and possibly attacked image (instead of the image itself). Due to the above modifications the proposed technique exhibits superior performance as compared to the conventional HVS-based blind adaptive watermarking. This performance improvement has been justified theoretically and verified through extensive simulations. In particular, the proposed technique is robust to additive white noise, JPEG and Wavelet compression, filtering etc.

关键词： Watermarking Humans Detectors Additive white noise Transform coding Image coding Filtering Image quality Robustness informatics

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From IPv4 to IPv6: the case of OpenH323 library

From IPv4 to IPv6: the case of OpenH323 library

引用

Workshops on Applications and the Internet (SAINT)

作者： Ch. Bouras A. Gkamas K. Stamos Computer Engineering and Informatics Department University of Patras Patras Greece Research Academic Computer Technology Institute Patras Greece

We discuss our experience form porting the OpenH323 platform to IPv6. We briefly discuss the structure of the platform, and we present the various problems we faced and choices we made, regarding the easiest approach to the porting procedure, the compatibility with earlier, IPv4-only versions of the platform, the existence of tools that could aid us with the porting task and the verification of results. We believe that the results of our effort can serve as guidelines for other similar projects and we present a general methodology which might be applicable to similar porting projects.

关键词： computer aided software engineering Libraries Protocols Guidelines Operating systems informatics Shape Internet IP networks Costs

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Deployment of a DiffServ-based priority service in a MAN/WAN environment

Deployment of a DiffServ-based priority service in a MAN/WAN...

引用

International Conference on Advanced Information Networking and Applications (AINA)

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

The increased need for quality of service (QoS) in today's networks has concentrated a lot of research and implementation efforts. Particular interest exists for the exploitation of the DiffServ framework towards the provision of qualitative services in MAN and WAN worldwide. Although individual mechanisms have been widely investigated, not many references to studies combining all levels of priority and QoS provisioning exist. This work aims at presenting a thorough and unified approach to the dimensioning and provisioning of a high priority service for high-quality demanding traffic over a MAN/WAN environment. Our approach anticipates for bounds in specific quality metrics and is demonstrated by the experimental case-study of a high-priority service over a MAN topology.

关键词： Wide area networks Quality of service Telecommunication traffic Diffserv networks Traffic control Gold Delay Aggregates computer networks Topology

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Performance analysis for a DiffServ-enabled network: the case of relative service

Performance analysis for a DiffServ-enabled network: the cas...

引用

IEEE International Symposium on Network Computing and Applications

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

A lot of research work has recently focused on the exploitation of the DiffServ framework towards building reliable networking services that provide deterministic quality guarantees. In this work we are attempting to devise a DiffServ-based service model for relative differentiation of traffic in a network serving aggregated traffic. The service model proposed aims at providing a minimum capacity during congestion and a bounded average end-to-end delay to profile-conforming traffic, obtaining thus a relatively better performance when compared to the best-effort service. We provide the framework on which the proposed service model is based and we present results from its deployment in a simulation environment.

关键词： Performance analysis computer aided software engineering Diffserv networks Telecommunication traffic Traffic control computer networks Delay Quality of service Reliability engineering informatics

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

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

引用

International Parallel and Distributed Processing Symposium, IPDPS 2003

作者： Chatzigiannakis, Ioannis Nikoletseas, Sotiris Computer Technology Institute P.O. Box 1122 Patras26221 Greece Computer Engineering and Informatics Department University of Patras Patras26500 Greece

ISBN: (纸本)0769519261

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. © 2003 IEEE.

关键词： Energy efficiency

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Real-time FEXT crosstalk identification in ADSL systems 3

Real-time FEXT crosstalk identification in ADSL systems

引用

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...

引用

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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