4 IEEE (PCI 2011) th Panhellenic Conference. Kastoria, Greece. 2 October September. on Informatics. Angelos Michalas.

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1 201115th Panhellenic Conference on Informatics (PCI 2011) Kastoria, Greece 30 September 2 October 2011 Editors: Pantelis Angelidis Angelos Michalas 4 IEEE IEEE Catalog Number: CFP1163EPRT ISBN:

2 2011 Panhellenic Conference on Informatics PCI 2011 Table of Contents Message from General Cochairs Message from Program Cochairs Organizing Committee Program Committee Local Organizing Committee Keynote Speakers xii xiii xiv xv xvii xviii Information Systems Towards an Integrated Teaching Environment for Parallel Programming 3 Constantinos T. Delistavrou and Konstantinos G. Margaritis Teaching Software Project Management through Management Antipatterns 8 loannis Stamelos, Dimitrios Sottas, and Despoina Mallini MentorChat: Introducing a Configurable Conversational Agent as a Tool for Adaptive Online Collaboration Support 13 Stergios Tegos, Stavros Demetriadis, and Anastasios Karakostas Using an Automated Speech Emotion Recognition Technique to Explore the Impact of Bullying on Pupils Social Life 18 Theodoros lliou and Georgios Paschalidis Evaluation of Four, Free and Open Source DICOM Software Tools 23 O. Papadopoulou Academic Research PolicyMaking and Evaluation Using Graph Visualisation 28 Tsolakidis Anastasios, Cleo Sgouropoulou, loannis Xydas, Olivier Terraz, and Georgios Miaoulis ProMaSI A Project Management Simulator 33 Nicholaos Petalidis, Gregory Gregoriadis, Alexandros Theodoridis, and Antonios Chronakis V

3 An Databases and Data Mining The Effects of Dimensionality Curse in High Dimensional knn Search 41 Nikolaos Kouiroukidis and Georgios Evangelidis Data Node Splitting Policies for Improved Range Query Efficiency in kdimensional Point Data Indexes 46 Evangelos Outsios and Georgios Evangelidis Nearest Neighbor Algorithms Using xbrtrees 51 George Roumelis, Michael Vassilakopoulos, and Antonio Corral Incremental Discovery of Topk Correlative Subgraphs 5f5 Georgia S. Latsiou and Apostolos N. Papadopoulos Education Technologies Virtual Learning Environments Katerina Georgouli Overview 63 A Hacker's Perspective on Educating Future Security Experts 68 Alexandros Papanikolaou, Vassilios Karakoidas, Vasileios Vlachos, Andreas Venieris, Christos llioudis, and Georgios Zouganelis Pilot Introduction of IWB and COWs in Greek Schools 73 F. Foskolos, A. Vagelatos, and Th. Komninos Exploiting Web Conferencing to Support Collaborative Learning 78 Apostolos Mavridis, Thrasyvoulos Tsiatsos, and Stergios Tegos Algorithms and Data Structures A Performance Evaluation of the Preprocessing Phase of Multiple Keyword Matching Algorithms 85 Charalampos S. Kouzinopoulos and Konstantinos G. Margaritis Splaying for Compression: An Experimental Study 90 Dlmitris Antoniou, loannis Kampouris, Evangelos Theodoridis, and Athanasios Tsakalidis A Framework for Linked Data Business Models 95 Michalis Vafopoulos Dynamic Dominators in Practice 100 Konstantinos Patakakis, Loukas Georgiadis, and Vasileios A. Tatsis vi

4 Networking Applying Categorical Logic on a Holistic Security Architecture across Distributed Systems 107 Dirnitrios Sisiaridis and Nick Rossiter RealLife Paradigms of Wireless Network Security Attacks 112 I.P. Mavridis, A.l. E. Androulakis, A.B. Halkias, and Ph. Mylonas Collaborative Efforts for Safety and Security in Vehicular Communication Networks 117 George Kadas and Periklis Chatzimisios An Experimental Study of the Efficiency of Explicit Congestion Notification 122 Stefanos Harhalakis, Nikolaos Samaras, and Vasileios Vitsas Supporting Service Differentiation in Wireless Sensor Networks 127 MarieAurelie Nef, Sophia Karagiorgou, George I. and Panayotis K. Kikiras Stamoulis, Handling Multicast Video over Non Multicast Networks 134 Michail Tolkas, Michail Bletsas, and Pantelis Angelidis On Effectively Determining the DownlinktoUplink Subframe Width Ratio for Mobile WiMAX Networks Using Spline Extrapolation 139 Panagiotis Sarigiannidis, Malamati Louta, andangelos Michalas Optimal Tradeoff between Energy Consumption and Response Time in LargeScale MapReduce Clusters 144 Pavlos Paraskevopoulos and Anastasios Gounaris A Novel Probabilistic Flooding Strategy for Unstructured PeertoPeer Networks 149 Spiridoula V. Margariti and Vassilios V. Dimakopoulos An Automated System for Integrated Service Management in Emergency Situations 154 Nikolaos A. Pantazis, Stefanos A. Nikolidakis, Dionisis Kandris, and Dirnitrios D. Vergados Open Source Software SFparser: A Tool for Selectively Parsing SourceForge 161 Apostolos Kritikos and Fragkiskos Chatziasimidis Towards Open Source Software System Architecture Recovery Using Design Metrics 166 Eleni Constantinou, George Kakarontzas, and loannis Stamelos vii

5 eairquality: A Dynamic Web Based Application for Evaluating the Air Quality Index for the City of Kozani, Hellas Skordas loannis, George F. Fragulis, and Athanassios G. Triantafyllou Snmp for Ethernet Networks SETH: A Network Benchmark Toolkit for Managing Routers Statistical Information S. Kontogiannis, A. Karakos, G. Kokkonis, and P. Kitsos Multimedia Services Use of Behavioral Synthesis to Implement a Cellular Neural Network for Image Processing Applications Dimitrios Amanatidis and Michael Dossis Denoising of Binarized Byzantine Textual Images N. Ntogas, D. Ventzas, and M. Ventza Subjective and Objective Video Codec Evaluation Andreas Papadakis and Konstantinos Zachos A Personalized Audio Web Service Using MPEG7 and MPEG21 Standards 199 Emmanouil Skondras, Malamati Louta, and Panagiotis Sarigiannidis eservices: Empirical Studies Teenagers' Use of Social Network Websites and Privacy Concerns: A Survey 207 Evanthia Faliagka, Athanasios Tsakalidis, and Danae Vaikousi An Empirical Study on the Web Password Strength in Greece 212 Artemios G. Voyiatzis, Christos A. Fidas, Dimitrios N. Serpanos, and Nikolaos M. Avouris Social Multimedia Mining: A Social Informatics Perspective 217 Georgios Lappas Log File Analysis of Ecommerce Systems in Rich Internet Web 2.0 Applications 222 Constantine J. Aivalis and Anthony C. Boucouvalas Information Retrieval Search Culture Nikitas N. Karanikolas 229 A Comparable Study Employing WEKA Clustering/Classification Algorithms for Web Page Classification loannis Charalampopoulos and loannis Anagnostopoulos 235 A Framework for Visualizing the Web of Data: Combining DBpedia and Open APIs Agis Papantoniou, Vassilis Loumos, Miltos Poulizos, and Gregory Rigas 240 viii

6 A Comparison over Focused Web Crawling Strategies 245 loannis Avraam and loannis Anagnostopoulos Numerical and Scientific Computations Higher Order Finite Difference Preconditioned Scheme: A Multithreaded Approach 253 C.K. FilelisPapadopoulos, G.A. Grawanis, and E.A. Lipitakis A Note on Parallel Finite Element Approximate Inverses Using OpenMP on Multicore Systems 259 P.I. Matskanidis, G.A. Grawanis, and K.M. Giannoutakis Design and Implementation of OpenMP Tasks in the OMPi Compiler 265 Spiros N. Agathos, Panagiotis E. Hadjidoukas, and Vassilios V. Dimakopoulos Elastic Component Characterization with Respect to Quality Properties: An Intuitionistic FuzzyBased Approach 270 George Kakarontzas, Vassilis C. Gerogiannis, loannis Stamelos, and Panagiotis Katsaros HumanComputer Interaction Building a PlatformAgnostic Wireless Network of Interconnected Smart Objects 277 Orestis Akribopoulos, Vasileios Georgitzikis, Anastasia Protopapa, and loannis Chatzigiannakis etracer: An Innovative NearReal Time TrackandTrace Platform 282 Efi Papatheocharous and Panagiotis Gouvas Evaluation of TipActivated and PushButton Infrared Pens for Interactive Whiteboards 287 Dimitrios Kravvaris, Eleni Thanou, and Konstantinos Chorianopoulos The Concept and Design of an Open, Integrated Print Charging System 292 Michael Kalochristianakis, Kostas Grammatikakis, Manolis Saldaris, Irene Mastorakis, and Grigoris Tzanodaskalakis ecommerce, ebusiness, egovernment, ehealth Interviewing the Amazon Web Salespersons: Trends, Complementarities and Competition 299 Michalis Vafopoulos, Thomas Theodoridis, and Dimitris Kontokostas Promoting egov Services: edocument Interoperability across EU 304 Andreas Papadakis, Konstantinos Rantos, and Antonis Stasis ix

7 The The Military Model in I.T. and Computer Studies: A Violation against Women's Rights in Work and Education 309 Dionisis Georgopoulos Information Systems and Innovation in Investigation Greek Firms An Empirical Spyros Arvanitis, Euripidis Loukis, and Vasiliki Diamantopoulou 315 Seismicity Online Grid Map for Regional Earthquake Activity Studies 321 Athanasios Keskempes, Anthony Roussos, Nikos Tselikas, and Anthony C. Boucouvalas Special Session: Mobile Device Software Development A Mobile Application Supporting Conference Attendees and Organizers 333 Chris D. Kounavis, Efpraxia D. Zamani, and George M. Giaglis Education and Learning in the Semantic Web 338 Anna Kasimati and Efpraxia Zamani Implementing an Open Personal Learning Environment 345 Alexandres Soumplis, Eleni Chatzidaki, Eleni Koulocheri, and Michalis Xenos Special Session: Quality in Educational Technologies Analyzing the Fora: An Algorithms Combination for the Representation of Messages 353 Kiriakos Patriarcheas, Spyridon Papaloukas, and Michalis Xenos A Combined Algorithm for LMS Usage Assessment 358 Stavros Valsamidis, Sotirios Kontogiannis, Alexandros Karakos, and loannis Kazanidis Touch Your Program with Hands: Qualities in Tangible Programming Tools for Novice 363 Theodosios Sapounidis and Stavros Demetriadis Effectiveness of a Framed WikiBased Learning Activity in the Context of HCI Education 368 Nikolaos Tselios, Panagiota Altanopoulou, and Christos Katsanos Developing an Information System for Quality Assurance in Higher Education Using the Balanced Scorecard Technique Case Study of TEIA 373 Manolis Chalaris, Anastasios Tsolakidis, Cleo Sgouropoulou, and loannis Chalaris X

8 Special Session: Real World Internet Unattended Surveillance Network for AfterDisaster Support in Public Transportations Sector 381 C. Alexakos, M. Georgoudakis, A. Kalogeras, F. Andritsos, P. Konstantinopoulos, and I. Chatzigiannakis iprotect: An Open Source Emergency Management Framework 386 MarieAurelie Nef, loannis Filippopoulos, Eleftherios Voumvourakis, Aggelos Aggelis, Leonidas Perlepes, Georgios Stamoulis, and Panayotis Kikiras PatrasSense: Participatory Monitoring of Environmental Conditions in Urban Areas Using Sensor Networks and Smartphones 392 Pantelis Vikatos, Evangelos Theodoridis, Georgios Mylonas, and Athanasios Tsakalidis Wireless Sensor Network for Precision Agriculture 397 A. Tagarakis, V. Liakos, L. Perlepes, S. Fountas, and T. Gemtos Author Index 403 xi