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Managing users and services using an LDAP based web-application

Managing users and services using an LDAP based web-applicat...

引用

21st IASTED International Multi-Conference on Applied informatics

作者： Bouras, C. Khan, V.-J. Limperis, A. Sintoris, C. Computer Technology Institute-CTI Riga Feraiou 61 26221 Patras Greece Department of Computer Engineering University of Patras 26500 Rion Patras Greece Department of Electrical Engineering University of Patras 26500 Rion Patras Greece

ISBN: (纸本)0889863415

This paper describes the design and implementation of an open and adaptive environment for managing LDAP databases. Our work was mainly focused on the administrative needs of the Greek Schools Network. Albeit we applied considerable effort in order to construct an application that would not be bound on limitations arisen by the specific characteristics of the Greek Schools Network. Such limitations are the directory technology used and the directory schema applied. The result of this effort is a design which is extensible, adaptive to a great variety of LDAP structures and which provides the necessary flexibility to perform even the most demanding administrative tasks.

关键词： Database systems

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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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On the efficient generation of elliptic curves over prime fields

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4th International Workshop on Cryptographic Hardware and Embedded Systems, CHES 2002

作者： Konstantinou, Elisavet Stamatiou, Yiannis C. Zaroliagis, Christos Computer Technology Institute P.O. Box 1122 Patras26110 Greece Department of Computer Engineering and Informatics University of Patras Patras26500 Greece

ISBN: (纸本)3540004092

We present a variant of the complex multiplication method that generates elliptic curves of cryptographically strong order. Our variant is based on the computation ofWeber polynomials that require significantly less time and space resources than their Hilbert counterparts. We investigate the time efficiency and precision requirements for generating off-line Weber polynomials and its comparison to another variant based on the off-line generation of Hilbert polynomials. We also investigate the efficiency of our variant when the computation of Weber polynomials should be made on-line due to limitations in resources (e.g., hardware devices of limited space).We present trade-offs that could be useful to potential implementors of elliptic curve cryptosystems on resource-limited hardware devices. © Springer-Verlag Berlin Heidelberg 2003.

关键词： Polynomials

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Real-time FEXT crosstalk identification in ADSL systems 3

Real-time FEXT crosstalk identification in ADSL systems

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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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Competitive video on demand schedulers for popular movies

Competitive video on demand schedulers for popular movies

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作者： Bouras, Christos Kapoulas, Vaggelis Pantziou, Grammati Spirakis, Paul Research Academic Computer Technology Institute 2 Riga Feraiou 61 262 21 Patras Greece Department of Computer Engineering and Informatics University of Patras 265 00 Rion-Patras Greece Department of Informatics Technological Education Institute of Athens Ag. Spyridonos Str. 122 10 Egaleo-Athens Greece

In this paper we investigate the online video on demand problem, namely having to accept or reject a request for a movie without knowing the future requests. We present online movie-scheduling schemes that implement the principles of refusal by choice and delayed notification. A novel way to schedule movies that exploits the knowledge of the distribution of the preference of requests for movies, is shown to have a competitive ratio that outperforms all the previously known schemes in practical situations. In fact, our scheduler has a competitive ratio bounded above by a constant, independent of the number of the users, channels, or movies, in the case that a large fraction of the requests tends to concentrate in a small number of movies. We extend our approach by presenting an "adaptive" randomized scheduler which initially is not aware of the movie popularities but it adapts to it, and achieves the same asymptotic competitive ratio. © 2002 Elsevier Science B.V. All rights reserved.

关键词： Competitive ratio Online scheduling algorithm Probability distribution Video on demand

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Pattern recognition of EEG signals during right and left motor imagery 13

Pattern recognition of EEG signals during right and left mot...

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13th IFAC Symposium on System Identification, SYSID 2003

作者： Inoue, Katsuhiro Pfurtscheller, Gert Neuper, Christa Kumamaru, Kousuke Department of Control Engineering and Science Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology 680-4 Kawazu Iizuka Fukuoka820-8502 Japan Department of Medical Informatics Institute of Biomedical Engineering Graz University of Technology Inffeldgasse 16a Graz8010 Austria

Electroencephalograph (EEG) recordings during right and left motor imagery can be used to move a cursor to a target on a computer screen. Such an EEG-based brain-computer interface (BCI) can provide a new communication channel to replace an impaired motor function. It can be used by e.g., handicap users with amyotrophic lateral sclerosis (ALS). In this study, statistical pattern recognition method based on AR model was introduced to discriminate the EEG signals recorded during right and left motor imagery. And learning methods (processing period for parameter estimation, AR order, etc.) were investigated. Finally, the effectiveness of our method was confirmed through the experimental studies. © 2003 International Federation of Automatic Control.

关键词： Brain computer interface

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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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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

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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Multi-user layer in the EVE distributed virtual reality platform

Multi-user layer in the EVE distributed virtual reality plat...

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International Conference on Distributed Computing Systems Workshop

作者： C. Bouras D. Psaltoulis C. Psaroudis T. Tsiatsos Computer Engineering and Informatics Department University of Patras Greece Research Academic Computer Technology Institute Greece

In this paper, we present the design and implementation of a VRML97 multi-user layer, which is introduced in the EVE distributed virtual reality platform. Main consideration of our multi-user extension is the ease of transforming single-user virtual worlds to multi-user virtual worlds, as well as the conformity with any standard VRML97 browser. Furthermore, we present the EVE's communication platform, which can be used in order to support Collaborative Virtual Environments (CVEs). Main issues regarding the effective network communication as well as the initialization of the 3D scene are discussed in this paper.

关键词： Virtual reality Distributed computing informatics Virtual environment Design engineering Layout Space technology Collaboration User interfaces Web sites

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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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