Proceedings 12th Pan-Hellenic Conference on Informatics PCI 2008 August 28-30, 2008 Samos Island, Greece Organized by The Greek Computer Society The University of the Aegean, Department of Information and Communication Systems Engineering The University of Crete, Department of Computer Science The Technical University of Crete, Department of Electronic and Computer Engineering Los Alamitos, California Washington Tokyo
Table of Contents PCI 2008 12th Pan-Hellenic Conference on Informatics Preface ix 2008 Committees x Security, Privacy, and Trust Towards Privacy in Personal Data Management 3 Pavlos S. Efraimidis, George Drosatos, Fotis Nalbadis, and Aimilia Tasidou Intrusion Detection Using Evolutionary Neural Networks 8 Emmanuel S. Michailidis, Sokratis K. Katsikas, and Efstratios Georgopoulos Analysis and Synthesis of the Current Situation in IT Security 13 Constantine A. Kalentis Information and Data Management A Comparison of Centralized and Distributed Information Retrieval Approaches 21 Georgios Paltoglou, Michail Salampasis, and Maria Satratzemi Cost Models and Efficient Algorithms on Existentially Uncertain Spatial Data 26 Elias Frentzos, Nikos Pelekis, and Yannis Theodoridis Continuous Top-k Dominating Queries in Subspaces 31 Maria Kontaki, Apostolos N. Papadopoulos, and Yannis Manolopoulos Web and Search Effective Ranking Fusion Methods for Personalized Metasearch Engines 39 Leonidas Akritidis, Dimitrios Katsaros, and Panayiotis Bozanis Site-Specific versus General Purpose Web Search Engines: A Comparative Evaluation 44 Georgios Atsaros, Diomidis Spinellis, and Panagiotis Louridas Mitos: Design and Evaluation of a DBMS-Based Web Search Engine 49 Panagiotis Papadakos, Yannis Theoharis, Yannis Marketakis, Nikos Armenatzoglou, and Yannis Tzitzikas v
Web and Services User Interface Personalization for the WWW Using Adaptive Browsing Shortcuts 57 Michail Salampasis, Christos Kouroupetroglou, and Constantinos Delistavrou Cognitive and Affective Antecedents of Mobile Data Services Usage Intention 62 Dimitrios C. Karaiskos, Dimitrios Drosos, Alexandros S. Tsiaousis, and George M. Giaglis The Greek Electronic Government Interoperability Framework: Standards and Infrastructures for One-Stop Service Provision 66 Yannis Charalabidis, Fenareti Lampathaki, Demetrios Sarantis, Aikaterini-Maria Sourouni, Spiros Mouzakitis, George Gionis, Sotirios Koussouris, Christos Ntanos, Christos Tsiakaliaris, Vasilis Tountopoulos, and Dimitris Askounis P2P and Grid Resource Discovery in a Grid System Based on Matchmaking-Routers 73 Konstantinos I. Karaoglanoglou and Helen D. Karatza QoS-Based Decision Services in Grids 78 Dimosthenis Kyriazis, Peer Hasselmeyer, Konstantinos Tserpes, Andreas Menychtas, and Theodora Varvarigou Design and Implementation Aspects of a Novel Java P2P Simulator with GUI 83 Vassilios Chrissikopoulos, George Papaloukopoulos, Evangelos Sakkopoulos, and Spyros Sioutas P2P Reputation Systems Credibility Analysis: Tradeoffs and Design Decisions 88 Eleni Koutrouli and Aphrodite Tsalgatidou Knowledge and Machine Learning Knowledge Exploitation through Modeling, Navigation and Querying, an Ontology-Based Integrated Architecture 95 Giorgos Kourlimpinis, Giorgos Gyftodimos, John Psarras, and Dimitris Askounis Applying Machine Learning to Extract New Knowledge in Precision Agriculture Applications 100 Savvas Dimitriadis and Christos Goumopoulos Graphical Representation as a Factor of 3D Software User Satisfaction: A Metric Based Approach 105 Apostolos Ampatzoglou, Alexandros Chatzigeorgiou, and Ioannis Stamelos Wired and Wireless Networks 1 Development of Wireless Embedded System Using ZigBEE Protocol to Avoid White Gaussian Noise and 50 Hz Power Line Noise in ECG and Pressure Blood Signals 113 Konstantinos Kalovrektis, Theodore Ganetsos, Evaggelos Fountas, and Georgia Tzitzili A BBN Based Approach for Improving a Telecommunication Software Estimation Process 118 Stamatia Bibi, Ioannis Stamelos, George Gerolimos, and Vangelis Kollias Real-Time Collection of Electromagnetic Field Measurements Using a Metropolitan Wireless Mesh Network 123 Nikolaos Petroulakis and Vasilios A. Siris vi
Simulation and Tools Design and Simulation of NAND Gates Made of Single Electron Devices 131 Thomas Tsiolakis, George Ph. Alexiou, and Nikolaos Konofaos A Design Flow for the Precise Identification of the Worst-Case Voltage Drop in Power Grid Analyses 135 D.P. Karampatzakis, M.K. Tsiampas, N.E. Evmorfopoulos, and G.I. Stamoulis Simulator Implementation of an IF-ISAR System for Studies in Target Glint 140 Theodoros G. Kostis, Konstantinos G. Galanis, and Socrates K. Katsikas Image and Signal Processing Hardware Acceleration for 3D Image Reconstruction 147 Dionisis Chaikalis, Giorgios Passalis, Nikos Sgouros, Dimitris Maroulis, and Theoharis Theoharis Obstacle Detection from Uncalibrated Cameras 152 Nadia Baha Touzene and Slimane Larabi Computer-Aided Malignancy Risk Assessment of Nodules in Thyroid US Images Utilizing Boundary Descriptors 157 Michalis A. Savelonas, Dimitris E. Maroulis, Dimitris K. Iakovidis, and Nikos Dimitropoulos Distributed Applications and Performance Evaluation A Multi-Platform Framework for Distributed Computing 163 Michael Grivas and Dimitris Kehagias Performance Evaluation of Multiple Approximate String Matching Algorithms Implemented with MPI Paradigm in an Experimental Cluster Environment 168 Panagiotis D. Michailidis and Konstantinos G. Margaritis Java Performance Evaluation Using External Instrumentation 173 Georgios Gousios and Diomidis Spinellis Business Applications and Management The Intervening Role of BPR in the ICT Business Performance Relationship 181 Euripidis Loukis and Konstantinos Pazalos ERP Systems Business Value: A Critical Review of Empirical Literature 186 Fotini Michailidou, Anthi-Maria Sergi, and Euripidis Loukis Learning Software Project Management on the Web: The Impact of Question Prompts 191 Pantelis M. Papadopoulos, Stavros N. Demetriadis, Ioannis G. Stamelos, and Ioannis A. Tsoukalas Education and New Technologies A Prototype System for Educational Data Warehousing and Mining 199 Nikolaos Dimokas, Nikolaos Mittas, Alexandros Nanopoulos, and Lefteris Angelis The Asynchronous Distance Education by Means of Internet: Factors that Influence its Effectiveness. The Case of Hellenic Open University 204 Kiriakos Patriarcheas and Michalis Xenos Local Grading of Learners 209 Sotiris Kotsiantis vii
Theory and Algorithms Stacking Cost Sensitive Models 217 Sotiris Kotsiantis A New Algorithm for On-Line Multivariate ARMA Identification Using Multimodel Partitioning Theory 222 Stylianos Sp. Pappas, Nicholas Harkiolakis, Panagiotis Karampelas, Lambros Ekonomou, and Sokratis K. Katsikas Formal Verification of Generalised State Machines 227 George Eleftherakis and Petros Kefalas Improving the Efficiency of Exact Two Dimensional On-Line Pattern Matching Algorithms 232 Charalampos S. Kouzinopoulos and Konstantinos G. Margaritis Wired and Wireless Networks 2 Power Control in WLANs for Optimization of Social Fairness 239 Vaggelis G. Douros, Pantelis A. Frangoudis, Konstantinos Katsaros, and George C. Polyzos A Systematic Approach for the Design of RFID Implementations in the Supply Chain 244 Cleopatra Bardaki, Angeliki Karagiannaki, and Katerina Pramatari Pervasive Computing and Robotics Delineating the Degree of Pervasiveness in Pervasive Information Systems: An Assessment Framework and Design Implications 251 Panos E. Kourouthanassis, George M. Giaglis, and Dimitrios C. Karaiskos A Cellular Automaton Collision-Free Path Planner Suitable for Cooperative Robots 256 Konstantinos Ioannidis, Georgios Ch. Sirakoulis, and Ioannis Andreadis Author Index 261 viii