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International Conference on Advanced Learning Technologies (ICALT)

作者： I. Hatzilygeroudis C. Giannoulis C. Koutsojannis Dept of Computer Engineering & Informatics University of Patras Patras Greece Research Academic Computer Technology Institute Patras Greece

In this paper, we present a Web-based intelligent education system to help students in the context of an AI course. We concentrate on the adaptivity and student evaluation aspects of the system. Adaptivity refers to the capability of the system to adapt teaching to student needs, specified by the student model characteristics. Student evaluation refers to the evaluation of the knowledge level of a student, which is one of the most important characteristics, with regards to taught concepts. Adaptive hypermedia techniques, like graphical link annotation, and an intelligent technique, i.e. a rule-based expert system, are used to achieve the above goals. An evaluation of the system showed encouraging results as far as its usability and learning are concerned.

关键词： Expert systems Adaptive systems Educational technology Artificial intelligence Intelligent systems Education Delta modulation World Wide Web Navigation Samarium

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A New Concept On A Quantum computer Based On Schockley‐Read‐Hall Recombination Statistics In Microelectronic Devices

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AIP Conference Proceedings 2005年第1期772卷 1463-1464页

作者： K. Theodoropoulos D. Ntalaperas I. Petras A. Tsakalidis N. Konofaos 1Computer Engineering and Informatics Dept. University of Patras Patras Greece 2Research Academic Computer Technology Institute Riga Feraiou 61 26110 Patras Greece

In this paper a quantum computer based on the recombination processes happening in semiconductor devices is presented. A “data element” and a “computational element” are derived based on Schokley‐Read‐Hall statistics and they can later be used in order to manifest a simple and known quantum algorithm. Such a paradigm is shown by the application of the proposed technology onto the Shor’s period‐finding algorithm.

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Advances in X3D multi-user virtual environments

Advances in X3D multi-user virtual environments

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IEEE International Symposium on Multimedia

作者： Ch. Bouras A. Panagopoulos Th. Tsiatsos Computer Engineering andaspx Informatics Department University of Patras Greece Technology Institute Research Academic Computer Greece

This paper presents the current state of the art in Web3d multi-user technologies and more specifically networked virtual environment platforms that support the X3D standard, which are currently limited in number, and also the existing X3D browsers that enable these applications. Furthermore, this paper presents the architecture of a platform, called EVE, which was developed to support multi-user virtual environments and was initially based on VRML, as well as the implementation regarding the process of upgrading this platform in order to fully support the X3D standard, using the open-source Xj3D library. Finally, the benefits of shifting to the X3D standard are presented, and some of the problems that currently exist are discussed.

关键词： Virtual environment Collaboration computer networks Application software informatics Standards development Internet Graphics Data visualization Open source software

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A Web service for embedded distributed computation

A Web service for embedded distributed computation

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Euromicro Conference on Parallel, Distributed and Network-Based Processing

作者： D. Lioupis M. Stefanidakis Research Academic Computer Technology Institute Patras Greece & Department of Computer Engineering & Informatics University of Patras Greece

In this paper we investigate the idea of applying the emerging world-scale computing paradigm of Web services onto small-area clusters of embedded systems with limited resources. Our goal is to develop a truly standard and architecturally independent interface for aggregating the unused processing power of embedded devices. This power can be used to support ambient intelligence processing in residential areas, as well as exported to external users as commodity. We have used an embedded distributed computing system described in previous work, in order to show how an embedded generic computing Web service can be constructed. We have identified the limited processing power of embedded devices, as well as the dynamic nature of networks of appliances, as impeding factors for the introduction of Web services into small systems and we propose a hierarchical layered grouping of devices as a solution to this problem.

关键词： Web services Distributed computing Embedded computing Home appliances Pervasive computing informatics Embedded system Transport protocols Power engineering computing Standards development

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A decision feedback scheme for multimedia transmission over 3G mobile networks

A decision feedback scheme for multimedia transmission over ...

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IFIP International Conference on Wireless and Optical Communications Networks (WOCN)

作者： A.G. Alexiou C.J. Bouras V.G. Igglesis Computer Engineering and Informatics Department University of Patras Patras Greece Research Academic Computer Technology Institute Greece

UMTS, the successor of GSM, is evolving toward a future wireless all-IP network. In this paper we present how it supports real-time IP multimedia services, as these services are expected to drive the adoption of wireless all-IP networks. The scheme of real time streaming video is one of the newcomers in wireless data communication and in particular in UMTS, raising a number of novel requirements in both telecommunication and data communication systems. This scheme applies when the mobile user is experiencing real time multimedia content. In this paper, we describe the design and the implementation of a decision feedback scheme, which is based on real time protocols and it is used for streaming video over UMTS transport channels. The decision feedback scheme uses a friendly, to the mobile users, congestion control mechanism to control the transmission rate of the real time video sequence. Furthermore, we evaluate this mechanism through a number of experiments. During these experiments we demonstrate the friendly behavior of the decision feedback scheme to TCP and UDP data streams that coexist in the same channel with the video sequence.

关键词： Feedback Streaming media 3G mobile communication IP networks Bandwidth Data communication Video sequences Wireless networks Video compression Transport protocols

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Examining the benefits of a hybrid distributed architecture for bandwidth brokers

Examining the benefits of a hybrid distributed architecture ...

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IEEE International Conference on Performance, Computing and Communications (IPCCC)

作者： C. Bouras K. Stamos Computer Engineering and Informatics Department University of Patras Papas Greece Research Academic Computer Technology Institute Patras Greece

In this paper the issue of the architectural organization of a bandwidth broker with respect to the distribution of functionalities among separate entities is examined. We discuss the benefits of a distributed versus a centralized architecture and study some of the most important implementations. We also present a novel design proposal that builds on our earlier work on the admission control module of a bandwidth broker and introduces it in the framework of a distributed bandwidth broker architecture. Our conclusions are supported by a series of simulated experiments that we analyze.

关键词： Bandwidth Scalability Distributed computing Diffserv networks Admission control computer architecture informatics Electronic mail Proposals Analytical models

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Analyzing traffic across the Greek School Network

Analyzing traffic across the Greek School Network

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IEEE Workshop on Local and Metropolitan Area Networks (LANMAN)

作者： C. Kattirtzis E. Varvarigos K. Vlachos G. Stathakopoulos M. Paraskevas Computer Engineering and Informatics Department University of Patras Patras Greece Research Academic Computer Technology Institute Patras Greece

In this paper, we present a comprehensive traffic analysis of the Greek School Network (GSN), a wide area network designed to provide Internet access and services to about 15,000 units of primary and secondary education schools and administration offices. In our analysis, we have used measurements from the PATRAS region node obtained through the Cisco NetFlow and FlowScan tools. We have used classical analysis to obtain protocol and application traffic statistics. Our study revealed that TCP traffic is dominant in the network, while nearly 50% of the outgoing and 37% of the incoming traffic is peer-to-peer (P2P) traffic, with a further 25.6% of traffic using not registered ports and suspected to be P2P as well. Finally, we have also observed a remarkable traffic locality phenomenon in the P2P services, where more than the 90% of the traffic was heading or generated by 50 hosts

关键词： Telecommunication traffic Traffic control Peer to peer computing Wide area networks Educational institutions Access protocols Statistics IP networks Web and internet services Statistical analysis

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Energy-aware routing in wireless ad-hoc networks

Energy-aware routing in wireless ad-hoc networks

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IEEE International Symposium on World of Wireless Mobile and Multimedia Networks (WoWMoM)

作者： P.C. Kokkinos C.A. Papageorgiou E.A. Varvarigos Department of Computer Engineering and Informatics University of Patras Patras Greece Research Academic Computer Technology Institute Patras Greece

We study energy efficient routing strategies for wireless ad-hoc networks. In this kind of network, energy is a scarce resource and its conservation and efficient use is a major issue. Our strategy follows the multi-cost routing approach, according to which a cost vector of various parameters is assigned to each link. The parameters of interest are the number of hops on a path, and the residual energy and transmission power of the nodes on the path. These parameters are combined in various optimization functions, corresponding to different routing algorithms, for selecting the optimal path. We evaluate the routing algorithms proposed in a number of scenarios, with respect to energy consumption, throughput and other performance parameters of interest. From the experiments conducted, we conclude that routing algorithms that take into account energy related parameters, increase the lifetime of the network, while achieving better performance than other approaches, such as minimum hop routing.

关键词： Intelligent networks Ad hoc networks Costs Energy efficiency Energy consumption Routing protocols Throughput Mobile ad hoc networks Batteries Power engineering and energy

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Motif extraction from biological sequences: trends and contributions to other scientific fields

Motif extraction from biological sequences: trends and contr...

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International Conference on Information technology and Applications, ICITA

作者： K. Perdikuri A. Tsakalidis Department of Computer Engineering and Informatics University of Patras Patras Greece Research Academic Computer Technology Institute Patras Greece

In this paper we present algorithms for the localization and extraction of interesting motifs from biological sequences. We are especially interested in weighted sequences, which are extensively used in molecular biology as profiles for protein families and for the representation of binding sites. It is our belief that these algorithms can also be applied to other information technology applications such as network management, data mining and signal processing.

关键词： Sequences Biological information theory Proteins Signal processing algorithms Data mining DNA Biology computing Information technology RNA Biological system modeling

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Implementation issues of managed bandwidth service: the case of GRNET

Implementation issues of managed bandwidth service: the case...

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Proceedings of the Systems Communications, SENET

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

This paper describes the design and the implementation of the managed bandwidth service (MBS) in a high speed backbone network as well as a management tool for the service. The service was designed taking advantage of features provided by the MPLS technology and also using the DiffServ architecture. So, it uses L2 MPLS VPNs to provide point to point connection and also marks the traffic in order to pass from certain priority queues (to provide guaranteed bandwidth). It also enables traffic engineering characteristics in order to provide load balancing on the network as well as fast rerouting in case of link failure. In addition we implemented a management tool for the service. The scope of this tool is to allow the users to manage their MBS requests (make a new one, edit, delete or view a request). Also the tool performs admission control and produces the necessary configuration that must be applied on the network in order to implement every service's request. This service was designed and implemented on GRNET's network.

关键词： Bandwidth computer aided software engineering technology management Spine Multiprotocol label switching computer networks computer network management engineering management Diffserv networks Telecommunication traffic

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