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检索条件"机构=Computer Technology Institute CTI and Department of Computer Engineering and Informatics"

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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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An efficient BIST scheme for high-speed adders

An efficient BIST scheme for high-speed adders

引用

IEEE Symposium on On-Line Testing (IOLTS)

作者： D.G. Nikolos D. Nikolos H.T. Vergos C. Efstathiou Computer Engineering and Informatics Department University of Patras Patras Greece Computer Technology Institute Patras Greece Informatics Department TEI Athens Athens Greece

In this paper we present a new pseudorandom BIST scheme for high-speed adders. Under this scheme an adder is simultaneously used as a test pattern generator and as a response compactor during its own testing. The main advantages of the proposed scheme, compared to prior methods, are minimal performance penalty, small hardware overhead and the benefits of at-speed testing.

关键词： Built-in self-test Circuit testing Adders Circuit faults Hardware Automatic testing Integrated circuit testing Test pattern generators Fault detection informatics

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Efficient BIST schemes for RNS datapaths

Efficient BIST schemes for RNS datapaths

引用

IEEE International Symposium on Circuits and Systems (ISCAS)

It has recently been shown that accumulators can be used efficiently for test pattern generation as well as for test response compaction. In this paper we present a BIST scheme for accumulators where the accumulator is simultaneously used as a test pattern generator and a response compactor during its own testing. We also show that the proposed BIST scheme is especially suitable for accumulator, adder and multiplier-accumulator RNS channels leading to minimal hardware overhead and short test sequences.

关键词： Built-in self-test Circuit testing Hardware Test pattern generators Automatic testing Integrated circuit testing Adders Digital signal processing Delay informatics

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A family of parallel-prefix modulo 2/sup n/-1 adders

A family of parallel-prefix modulo 2/sup n/-1 adders

引用

International Conference on Application Specific Systems (ASAP), Architectures and Processors

作者： G. Dimitrakopoulos H.T. Vergos D. Nikolos C. Efstathiou Computer Engineering and Informatics Department University of Patras Patras Greece Computer Technology Institute Patras Greece Informatics Department TEI Athens Athens Greece

We reveal the cyclic nature of idempotency in the case of modulo 2/sup n/-1 addition. Then based on this property, we derive for each n, a family of minimum logic depth modulo 2/sup n/-1 adders, which allows several trade-offs between the number of operators, the internal wire length, and the fanout of internal nodes. Performance data, gathered using static CMOS implementations, reveal that the proposed architectures outperform all previously reported ones in terms of area and/or operation speed.

关键词： Bismuth Concurrent computing Logic Fault tolerant systems computer networks computer errors TCPIP IP networks Floating-point arithmetic Power dissipation

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A multiple representational environment for learning programming and C

A multiple representational environment for learning program...

引用

International Conference on Advanced Learning Technologies (ICALT)

作者： K. Zikouli M. Kordaki E. Houstis Department of Computer Engineering & Informatics University of Patras Patras Greece Computer Technology Institute Patras Greece Department of Computer Engineering & Telecommunications University of Thessally Volos Greece

We present the design and the basic features of a computer learning environment for programming and C using geometrical objects (L.E.C.G.O.). The design of this environment was the result of modeling. Basic aspects of constructivism have also been taken into account in its design. L.E.C.G.O. provides pupils with opportunities to: a) express their problem solving strategies in multiple representation systems starting from intuitive representations and moving gradually to more sophisticated ones, b) solve a variety of familiar and meaningful problems, and c) overcome the cognitive load of the syntactical rules of programming in C by using appropriately designed computer-based authoring tools. A similar environment has not yet been reported.

关键词： Telecommunication computing Problem-solving Design engineering Feedback Writing informatics Electronic mail computer science Mathematical programming Flowcharts

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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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Low power test set embedding based on phase shifters

Low power test set embedding based on phase shifters

引用

IEEE computer Society Annual Symposium on VLSI

作者： M. Bellos D. Kagaris D. Nikolos Computer Engineering & Informatics Department University of Patras Greece Computer Technology Institute Patras Greece Electrical & Computer Engineering Department Southem Illinois University Carbondale IL USA

A new efficient method for test set embedding based on phase shifters was recently proposed This method suffers from high average and peak power consumption. In this work we propose a new phase shifter-based test set embedding method, which, by using interleaving and two LFSRs that change state in a non-overlapping way, significantly reduces the average and peak power consumption.

关键词： Phase shifters Circuit testing Energy consumption Built-in self-test Circuit faults Embedded computing Power engineering computing Automatic testing Integrated circuit testing Power engineering and energy

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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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