2011 Panhellenic Conference on Informatics PCI Table of Contents

Transcription

1 2011 Panhellenic Conference on Informatics PCI 2011 Table of Contents Message from General Co-chairs...xii Message from Program Co-chairs...xiii Organizing Committee...xiv Program Committee...xv Local Organizing Committee...xvii Keynote Speakers...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 Ioannis Stamelos, Dimitrios Settas, 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 Iliou and Georgios Paschalidis Evaluation of Four, Free and Open Source DICOM Software Tools...23 O. Papadopoulou Academic Research Policy-Making and Evaluation Using Graph Visualisation...28 Tsolakidis Anastasios, Cleo Sgouropoulou, Ioannis Xydas, Olivier Terraz, and Georgios Miaoulis ProMaSI - A Project Management Simulator...33 Nicholaos Petalidis, Gregory Gregoriadis, Alexandros Theodoridis, and Antonios Chronakis v

2 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 k-dimensional Point Data Indexes...46 Evangelos Outsios and Georgios Evangelidis Nearest Neighbor Algorithms Using xbr-trees...51 George Roumelis, Michael Vassilakopoulos, and Antonio Corral Incremental Discovery of Top-k Correlative Subgraphs...56 Georgia S. Latsiou and Apostolos N. Papadopoulos Education Technologies Virtual Learning Environments - An Overview...63 Katerina Georgouli A Hacker's Perspective on Educating Future Security Experts...68 Alexandros Papanikolaou, Vassilios Karakoidas, Vasileios Vlachos, Andreas Venieris, Christos Ilioudis, 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 Dimitris Antoniou, Ioannis Kampouris, Evangelos Theodoridis, and Athanasios Tsakalidis A Framework for Linked Data Business Models...95 Michalis Vafopoulos Dynamic Dominators in Practice Konstantinos Patakakis, Loukas Georgiadis, and Vasileios A. Tatsis vi

3 Networking Applying Categorical Logic on a Holistic Security Architecture across Distributed Systems Dimitrios Sisiaridis and Nick Rossiter Real-Life Paradigms of Wireless Network Security Attacks I.P. Mavridis, A.-I. E. Androulakis, A.B. Halkias, and Ph. Mylonas Collaborative Efforts for Safety and Security in Vehicular Communication Networks George Kadas and Periklis Chatzimisios An Experimental Study of the Efficiency of Explicit Congestion Notification Stefanos Harhalakis, Nikolaos Samaras, and Vasileios Vitsas Supporting Service Differentiation in Wireless Sensor Networks Marie-Aurélie Nef, Sophia Karagiorgou, George I. Stamoulis, and Panayotis K. Kikiras Handling Multicast Video over Non Multicast Networks Michail Tolkas, Michail Bletsas, and Pantelis Angelidis On Effectively Determining the Downlink-to-Uplink Sub-frame Width Ratio for Mobile WiMAX Networks Using Spline Extrapolation Panagiotis Sarigiannidis, Malamati Louta, and Angelos Michalas Optimal Tradeoff between Energy Consumption and Response Time in Large-Scale MapReduce Clusters Pavlos Paraskevopoulos and Anastasios Gounaris A Novel Probabilistic Flooding Strategy for Unstructured Peer-to-Peer Networks Spiridoula V. Margariti and Vassilios V. Dimakopoulos An Automated System for Integrated Service Management in Emergency Situations Nikolaos A. Pantazis, Stefanos A. Nikolidakis, Dionisis Kandris, and Dimitrios D. Vergados Open Source Software SFparser: A Tool for Selectively Parsing SourceForge Apostolos Kritikos and Fragkiskos Chatziasimidis Towards Open Source Software System Architecture Recovery Using Design Metrics Eleni Constantinou, George Kakarontzas, and Ioannis Stamelos vii

4 e-airquality: A Dynamic Web Based Application for Evaluating the Air Quality Index for the City of Kozani, Hellas Skordas Ioannis, 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 MPEG-7 and MPEG-21 Standards Emmanouil Skondras, Malamati Louta, and Panagiotis Sarigiannidis e-services: Empirical Studies Teenagers' Use of Social Network Websites and Privacy Concerns: A Survey Evanthia Faliagka, Athanasios Tsakalidis, and Danae Vaikousi An Empirical Study on the Web Password Strength in Greece Artemios G. Voyiatzis, Christos A. Fidas, Dimitrios N. Serpanos, and Nikolaos M. Avouris Social Multimedia Mining: A Social Informatics Perspective Georgios Lappas Log File Analysis of E-commerce Systems in Rich Internet Web 2.0 Applications Constantine J. Aivalis and Anthony C. Boucouvalas Information Retrieval Search Culture Nikitas N. Karanikolas A Comparable Study Employing WEKA Clustering/Classification Algorithms for Web Page Classification Ioannis Charalampopoulos and Ioannis Anagnostopoulos A Framework for Visualizing the Web of Data: Combining DBpedia and Open APIs Agis Papantoniou, Vassilis Loumos, Miltos Poulizos, and Gregory Rigas viii

5 A Comparison over Focused Web Crawling Strategies Ioannis Avraam and Ioannis Anagnostopoulos Numerical and Scientific Computations Higher Order Finite Difference Preconditioned Scheme: A Multithreaded Approach C.K. Filelis-Papadopoulos, G.A. Gravvanis, and E.A. Lipitakis A Note on Parallel Finite Element Approximate Inverses Using OpenMP on Multicore Systems P.I. Matskanidis, G.A. Gravvanis, and K.M. Giannoutakis Design and Implementation of OpenMP Tasks in the OMPi Compiler Spiros N. Agathos, Panagiotis E. Hadjidoukas, and Vassilios V. Dimakopoulos Elastic Component Characterization with Respect to Quality Properties: An Intuitionistic Fuzzy-Based Approach George Kakarontzas, Vassilis C. Gerogiannis, Ioannis Stamelos, and Panagiotis Katsaros Human-Computer Interaction Building a Platform-Agnostic Wireless Network of Interconnected Smart Objects Orestis Akribopoulos, Vasileios Georgitzikis, Anastasia Protopapa, and Ioannis Chatzigiannakis etracer: An Innovative Near-Real Time Track-and-Trace Platform Efi Papatheocharous and Panagiotis Gouvas Evaluation of Tip-Activated and Push-Button Infrared Pens for Interactive Whiteboards Dimitrios Kravvaris, Eleni Thanou, and Konstantinos Chorianopoulos The Concept and Design of an Open, Integrated Print Charging System Michael Kalochristianakis, Kostas Grammatikakis, Manolis Saldaris, Irene Mastorakis, and Grigoris Tzanodaskalakis ecommerce, ebusiness, egovernment, ehealth Inter-viewing the Amazon Web Salespersons: Trends, Complementarities and Competition Michalis Vafopoulos, Thomas Theodoridis, and Dimitris Kontokostas Promoting e-gov Services: e-document Interoperability across EU Andreas Papadakis, Konstantinos Rantos, and Antonis Stasis ix

6 The Military Model in I.T. and Computer Studies: A Violation against Women's Rights in Work and Education Dionisis Georgopoulos Information Systems and Innovation in Greek Firms - An Empirical Investigation Spyros Arvanitis, Euripidis Loukis, and Vasiliki Diamantopoulou Seismicity Online Grid Map for Regional Earthquake Activity Studies Athanasios Keskempes, Anthony Roussos, Nikos Tselikas, and Anthony C. Boucouvalas Special Session: Mobile Device Software Development A Mobile Application Supporting Conference Attendees and Organizers Chris D. Kounavis, Efpraxia D. Zamani, and George M. Giaglis Education and Learning in the Semantic Web Anna Kasimati and Efpraxia Zamani Implementing an Open Personal Learning Environment Alexandros 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 Kiriakos Patriarcheas, Spyridon Papaloukas, and Michalis Xenos A Combined Algorithm for LMS Usage Assessment Stavros Valsamidis, Sotirios Kontogiannis, Alexandros Karakos, and Ioannis Kazanidis Touch Your Program with Hands: Qualities in Tangible Programming Tools for Novice Theodosios Sapounidis and Stavros Demetriadis Effectiveness of a Framed Wiki-Based Learning Activity in the Context of HCI Education Nikolaos Tselios, Panagiota Altanopoulou, and Christos Katsanos Developing an Information System for Quality Assurance in Higher Education Using the Balanced Scorecard Technique - The Case Study of TEI-A Manolis Chalaris, Anastasios Tsolakidis, Cleo Sgouropoulou, and Ioannis Chalaris x

7 Special Session: Real World Internet Unattended Surveillance Network for After-Disaster Support in Public Transportations Sector C. Alexakos, M. Georgoudakis, A. Kalogeras, F. Andritsos, P. Konstantinopoulos, and I. Chatzigiannakis i-protect: An Open Source Emergency Management Framework Marie-Aurélie Nef, Ioannis 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 Pantelis Vikatos, Evangelos Theodoridis, Georgios Mylonas, and Athanasios Tsakalidis Wireless Sensor Network for Precision Agriculture A. Tagarakis, V. Liakos, L. Perlepes, S. Fountas, and T. Gemtos Author Index xi