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Annual Symposium on Simulation

作者： I. Chatzigiannakis A. Kinalis A. Poulakidas G. Prasinos C. Zaroliagis Computer Technology Institute Department of Computer Engineering and Informatics University of Patras Patras Greece

DAP (distributed algorithms platform) is a generic and homogeneous simulation environment aiming at the implementation, simulation, and testing of distributed algorithms for wired and wireless networks. In this work, we present its architecture, the most important design decisions, and discuss its distinct features and functionalities. DAP allows the algorithm designer to implement a distributed protocol by creating his own customized environment, and programming in a standard programming language in a style very similar to that of a real-world application. DAP provides a graphical user interface that allows the designer to monitor and control the execution of simulations, visualize algorithms, as well as gather statistics and other information for their experimental analysis and testing.

关键词： Digital audio players Distributed algorithms Algorithm design and analysis Testing Wireless networks Protocols computer languages Graphical user interfaces Monitoring Analytical models

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Exporting processing power of home embedded devices to global computing applications

Exporting processing power of home embedded devices to globa...

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Euromicro Conference on Parallel, Distributed and Network-Based Processing

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

In today's life we are surrounded by numerous embedded devices that serve our daily needs, without being continuously in use. This fact, in conjunction with the tremendous growth of these devices, results in considerable idle time in a home environment. In other words, we are in the middle of a significant amount of underutilized processing power. Here we investigate the idea of exploiting the unused embedded processing power to execute intensive global computing applications, and the hardware and software issues that arise from such an approach. We present a framework enabling the participation of home embedded devices to the global computing grid, which we call e-grid (embedded grid), along with a theoretical analysis of its performance gain. We also develop an experimental setup based on Jini technology, and measure its actual performance, trying to explore the feasibility of the e-grid approach.

关键词： computer applications Embedded computing Home computing Power engineering computing Network servers Web server Application software Grid computing informatics Power engineering and energy

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Efficient algorithms for handling Molecular Weighted Sequences

Efficient algorithms for handling Molecular Weighted Sequenc...

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IFIP 18th World computer Congress, TC1 and 3rd International Conference on Theoretical computer Science, TCS 2004

作者： Iliopoulos, Costas S. Makris, Christos Panagis, Yannis Perdikuri, Katerina Theodoridis, Evangelos Tsakalidis, Athanasios Department of Computer Science King's College London Strand London WC2R2LS United Kingdom Department of Computer Engineering and Informatics University of Patras 26500 Patras Greece Research Academic Computer Technology Institute 61 Riga Feraiou Str. 26221 Patras Greece

ISBN: (纸本)1402081405

In this paper we introduce the Weighted Suffix Tree, an efficient data structure for computing string regularities in weighted sequences of molecular data. Molecular Weighted Sequences can model important biological processes such as the DNA Assembly Process or the DNA-Protein Binding Process. Thus pattern matching or identification of repeated patterns, in biological weighted sequences is a very important procedure in the translation of gene expression and regulation. We present time and space efficient algorithms for constructing the weighted suffix tree and some applications of the proposed data structure to problems taken from the Molecular Biology area such as pattern matching, repeats discovery, discovery of the longest common subsequence of two weighted sequences and computation of covers. © 2004 Springer Science + Business Media, Inc.

关键词： Pattern matching

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SeAl: managing accesses and data in peer-to-peer sharing networks

SeAl: managing accesses and data in peer-to-peer sharing net...

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International Conference on Peer-to-Peer Computing

作者： N. Ntarmos P. Triantafillou R.A. Computer Technology Institute and Computer Engineering and Informatics Department University of Patras Rio Greece

We present SeAl, a novel data/resource and data-access management infrastructure designed for the purpose of addressing a key problem in P2P data sharing networks, namely the problem of wide-scale selfish peer behavior. Selfish behavior has been manifested and well documented and it is widely accepted that unless this is dealt with, the scalability, efficiency, and the usefulness of P2P sharing networks will be diminished. SeAl essentially consists of a monitoring/accounting subsystem, an auditing/verification subsystem, and incentive mechanisms. The monitoring subsystem facilitates the classification of peers into selfish/altruistic. The auditing/verification layer provides a shield against perjurer/slandering and colluding peers that may try to cheat the monitoring subsystem. The incentives mechanisms effectively utilize these layers so to increase the computational/networking and data resources that are available to the community. Our extensive performance results show that SeAl performs its tasks swiftly, while the overhead introduced by our accounting and auditing mechanisms in terms of response time, network, and storage overheads are very small.

关键词： Seals Intelligent networks Peer to peer computing Monitoring Resource management computer network management informatics Scalability computer networks Delay

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Using VR technology to support e-learning: the 3D virtual radiopharmacy laboratory

Using VR technology to support e-learning: the 3D virtual ra...

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International Conference on Distributed Computing Systems Workshop

作者： A. Alexiou C. Bouras E. Giannaka V. Kapoulas M. Nani T. Tsiatsos Computer Engineering and Informatics Department University of Patras Greece Research Academic Computer Technology Institute Greece

We present a virtual laboratory, which is designed and implemented in the framework of the VirRAD European project. This laboratory represents a 3D simulation of a radio-pharmacy laboratory, where learners, represented by 3D avatars, can experiment on radio-pharmacy equipment by carrying out specific learning scenarios. We describe the functionality provided by this laboratory, the motivation factors which led to its formation, the technological decisions that were made for the optimization of the system as well as the envisioned steps to be carried out.

关键词： Virtual reality Electronic learning Laboratories Virtual environment Avatars Collaborative work Educational technology Collaboration computer aided instruction Internet

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Full-Coverage Web Prediction based on Web Usage Mining and Site Topology 04

Full-Coverage Web Prediction based on Web Usage Mining and S...

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IEEE WIC ACM International Conference on Web Intelligence (WI)

作者： D. Oikonomopoulou M. Rigou S. Sirmakessis A. Tsakalidis Computer Engineering and Informatics Department University of Patras Greece Research Academic Computer Technology Institute Patras Greece

ISBN: (纸本)9780769521008

Understanding and modeling user online behavior, as well as predicting future requests remain an open challenge for researchers, analysts and marketers. In this paper, we propose an efficient prediction schema based on the extraction of sequential navigation patterns from server log files, combined with web site topology. Traversed paths are monitored, internally recorded and cleaned before being completed with cashed page views. After session and episode identification follows the construction of n-grams. Prediction is based upon a 5 + n-gram schema with all lower level n-grams participating, a procedure that resembles the construction of an All 5th-order Markov Model. The schema achieves full coverage while maintaining competitive prediction precision.

关键词： Topology Predictive models Data mining Navigation Association rules Prefetching Accuracy informatics File servers Monitoring

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Determining quality inspection frequency in an automated production line based on field failure data analysis

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Operational Research 2004年第3期4卷 305-315页

作者： Tsarouhas, Panagiotis Liberopoulos, George Department of Informatics and Computer Technology Technological Education Institute of Lamia Greece Department of Mechanical & Industrial Engineering University of Thessaly Greece

We perform a statistical analysis of failure data of equipment obtained from a real automated pizza production line. Based on this data, we develop and solve a simple model of a quality inspector who visits several such lines to detect possible quality problems in the production process. His objective is to allocate the number of his visits to the different workstations of the lines so as minimize the total production time of undetected, defective products.

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Web page fragmentation for personalized portal construction

Web page fragmentation for personalized portal construction

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International Conference on Information technology: Coding and Computing (ITCC)

作者： B. Christos K. Vaggelis M. Ioannis Computer Engineering and Informatics Department University of Patras Greece Research Academic Computer Technology Institute Patras Greece

Web portals offer many services and wealth of content to Web users. However, most users do not find interest in all the content present in these sites. Most of them visit some specific sites and browse in specific thematic areas of them. In this paper, a software technique is presented that allows the viewers of Web sites to build their own personalized portals, using specific thematic areas of their preferred sites. This transcoding technique is based on an algorithm, which fragments a Web page in discrete fragments using the page's internal structure. A training and update procedure is used for identifying the different instances of thematic areas in different time points.

关键词： Web pages Portals HTML Algorithm design and analysis Transcoding Buildings informatics Software tools Web server Optical wavelength conversion

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Energy efficient protocols for sensing multiple events in Smart Dust networks

Energy efficient protocols for sensing multiple events in Sm...

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Annual Symposium on Simulation

作者： S. Nikoletseas I. Chatzigiannakis H. Euthimiou A. Kinalis A. Antoniou G. Mylonas Department of Computer Engineering and Informatics University of Patras Patras Greece Computer Technology Institute Patras Greece Department of Computer Department of Computer University of Patras Patras Greece

Wireless sensor networks are comprised of a vast number of ultra-small, autonomous computing and communication devices, with restricted energy, that cooperate to accomplish a large sensing task. In this work: a) we propose extended versions of two data propagation protocols for such networks: the sleep-awake probabilistic forwarding protocol (SW-PFR) and the hierarchical threshold sensitive energy efficient network protocol (H-TEEN). These non-trivial extensions improve the performance of the original protocols, by introducing sleep-awake periods in the PFR protocol to save energy, and introducing a hierarchy of clustering in the TEEN protocol to better cope with large networks; b) we implemented the two protocols and performed an extensive simulation comparison of various important measures of their performance with a focus on energy consumption; c) we investigate in detail the relative advantages and disadvantages of each protocol; and d) we discuss a possible hybrid combination of the two protocols towards optimizing certain goals.

关键词： Energy efficiency Protocols Intelligent networks Magnetic sensors Acoustic sensors computer networks Chemical and biological sensors Power engineering and energy informatics Wireless sensor networks

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Diminished-1 modulo 2/sup n/ + 1 squarer design

Diminished-1 modulo 2/sup n/ + 1 squarer design

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Euromicro Symposium on Digital System Design

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

Squarers modulo M are useful design blocks for digital signal processors that internally use a residue number system and for implementing the exponentiators required in cryptographic algorithms. In these applications, some of the most commonly used moduli are those of the form 2/sup n/ + 1. To avoid using (n + 1)-bit circuits, the diminished-1 number system can be effectively used in modulo 2/sup n/ + 1 arithmetic applications. In this paper, for the first time in the open literature, we formally derive modulo 2/sup n/ + 1 squarers that adopt the diminished-1 number system. The resulting implementations are built using only full- or half-adders and a final diminished-1 adder and can therefore be pipelined straightforwardly.

关键词： Arithmetic Cryptography Concurrent computing Adders Circuits Digital signal processors Digital signal processing Digital filters Filtering Digital modulation

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