IOANNIS T. CHRISTOU 

Associate Professor AIT

PERSONAL DATA

Place of Birth: Athens, Greece
Work Address: AIT, 19Km. Markopoulou Ave. Paiania Attica, 19002 GREECE
Work Phone: (+30)-210-668-2725
Fax: (+30)-210-668-2703
e-mail: ichr@ait.edu.gr

INTERESTS

Business Intelligence and Decision Support Systems, Distributed Systems and Computing, P2P Systems, Machine Learning, Large Scale Object Oriented Software Engineering.

EDUCATION

Experience

• Associate Professor, Athens Information Technology, Dec. 2007 – present. Teaching “Information Systems Modeling”, “Managerial Economics & Business Administration” (part of the MSIN program offered jointly with Carnegie-Mellon University, Pittsburgh PA), “Logistics & Supply Chain Management”, & “Systems Analysis & Design” courses at post-graduate level. Research in Supply Chain Management, Advanced Planning Systems, Clustering Ensembles for Location Problems, Business Intelligence & Machine Learning, Location-aware Social Networking Applications for Mobile Users.

• Adjunct Professor, Information Networking Institute, Carnegie-Mellon University, Pittsburgh, PA, USA, Jan. 2008 – Jan. 2011. Three year appointment.

• Assistant Professor, Athens Information Technology, Software Engineering and Web Applications Group, Oct. 2004 –Dec. 2007. Teaching “Information Systems Modeling”, “Advanced Topics on Dependable Systems” (part of the MSIN program offered jointly with Carnegie-Mellon University, Pittsburgh PA), “Systems Analysis & Design”, “Programming and Data Structures”, “Logistics & Supply Chain Management” courses at post-graduate level. Research in Distributed and P2P Systems: Load Balancing issues in Digital Libraries built on top of P2P systems, and distributed Information Retrieval. Research on Artificial Intelligence applications for network security and continuous TV-viewer profile adaptation. Preparation & submission of several research proposals in the EU IST 6th Framework program. Supervision of graduate theses and independent studies of graduate students. Technical manager of GBN2: web-based electronic trade and marketplace forum for INFOTE S.A (http://www.greekbiz.com). Technical manager for mobile games porting engine. Participation in the IP project ELeGI, European e-Learning GRID.

• Adjunct Assistant Professor (Π.Δ/407), Computer Engineering & Informatics Dept, University of Patras, Oct. 2003 –Oct. 2004. Teaching at the level of assistant professor the courses “Software Engineering” and “Computer Programming Laboratory” with emphasis on Object-Oriented Programming (and J2EE programming for web-based services deployment), Analysis and Design.

• Independent Consultant/Contractor, Nov. 2001 – present. Design and development of distributed Content Management System in the J2EE platform for large mobile services company. The system allows the creation and manipulation of arbitrary data types –described in XML docs or specified via Web GUIs–, whose instances must persist in the application backend. JAXP technology used for XML parsing. Mini-portal via Servlets and JSP under Tomcat for ΔΕΗ Α.Ε. (Greek public utility company). Planning aid tool for ΔΕΗ Α.Ε. as a web-based service. Medical Visitors Management System using web-interfaces (MySQL DBMS backend) for GAP Α.Ε. Specialized parallel s/w modules for VLSI CAD (circuit partitioning, packing/tiling, and routing congestion estimations) for AmmoCore Inc. Santa Clara, CA, USA. Consulting on multi-processor architecture and network issues.

• Member of Technical Staff, Lucent Technologies, Bell Labs/Hellas, Jun. 2001 – Oct. 2001. Research & development on location-based services and multi-modal interfaces on portable devices. Simulation of passive micro-locator of devices for TDMA cellular networks (especially GSM/GPRS). Designed and developed highly accurate s/w for location detection of mobile devices connected in a IEEE802.11 WLAN. Multi-modal interface research on combination of GUI forms and voice commands.

• Area Leader, Data and Knowledge Engineering, Intracom S.A., Jan. 2000 – Jun. 2001. Technical management and leadership of EU IST European project ARCHEOGUIDE researching outdoors user position & orientation tracking and the use of machine learning for providing adaptive tours with 3D augmented reality reconstruction of cultural heritage sites. Design of machine learning schemes for inferring user preferences, multithreading for multimedia presentation synchronization. User tracking via GPS & compass h/w and vision s/w techniques. Task leader in EU IST program UP-TV: Ubiquitous Personalized TV services (Digital TV personalization).

• Senior Developer, Delta Technology Inc, May 96 – Jan. 2000. Research and development on distributed evolutionary methods for locating optimal solutions to large-scale industrial problems such as crew assignment, domain decomposition etc. Very large scale OO software system for automatic creation of monthly schedules (bidlines) of the pilots of Delta Air Lines. System in production at Delta Air Lines since 1997. Research was nominated for the 1998 Daniel H. Wagner Award for excellence in Operations Research practice. Research & development of a real-time distributed Flight Planning System for Delta Air Lines (incorporating Shortest Paths with Resource Constraints algorithms).

• Research Assistant, Computer Sciences Dept. University of Wisconsin - Madison, Jan. 1994 - Aug. 1996. Research on parallel high level GA's for solving data partitioning problems that arise in engineering and scientific computing environments. Developed a methodology for the provably fast and accurate solution of such problems. Solves million binary variable problems in less than 2' on a network of SPARCServers 20. Significantly outperformed all other well-known methods (spectral bisection, geometric partitioning) in solution quality.

• Teaching Assistant, Computer Sciences Dept. University of Wisconsin - Madison, Sep. 1991 - Dec. 1995. Taught courses in optimization, numerical analysis and introduction to computers.

• Researcher, Intelligent Robotics & Control Unit, Dept. of Electrical & Computer Engineering, National Technical University of Athens, Greece, Sep. 1990 - May 1991. Designed and implemented an Expert System for multiple simultaneous fault diagnosis in automotives, (user: Lucas CAV.) Deep knowledge non-monotonic reasoning techniques used in shallow knowledge domain. Thus, system is tolerant to incorrect and/or incomplete information provided by users, performance degrades gracefully under such conditions.

• Exchange Student Engineer, Dept. of Computer Science, Salford University, Manchester, UK, Mar. 1990 - Jun 1990. Designed and implemented an Expert System for multiple fault diagnosis in digital circuits where deep knowledge is available.

Publications

1. Ioannis T. Christou and Stavros Ponis, “A Hierarchical System for Efficient Coordination of Available-To-Promise Logic Mechanisms”, International Journal of Production Research, in press, online version published 17 March, 2008.
2. Ioannis T. Christou and S.T. Ponis, “Enhancing Traditional ATP Functionality in Open Source ERP Systems: A Case-Study from the Food & Beverages Industry”, Intl. Journal of Enterprise Information Systems, 4(1), 2008.
3. S.T. Ponis, I.P. Tatsiopoulos, K.C. Tsitsiriggos, and Ioannis T. Christou, “Integrating Enterprise Resource Planning vendor evaluation into a proposed ERP selection methodology”, Intl. Journal of Integrated Supply Management, 3(4), 2007.
4. Ioannis T. Christou, Athanasios G. Lagodimos, and Dimitra Lycopoulou, “Hierarchical Production Planning for Multi-product Lines in the Beverage Industry”, Journal of Production Planning and Control, 18(5), Jul. 2007.
5. Ioannis T. Christou et. al., “GRID-based Virtual Laboratory Experiments for a Graduate Course on Sensor Networks”, IEEE Transactions on Education, 50(1), Feb. 2007. Special issue on “Grid-based Technologies Applied to Education”.
6. D. Papageorgiou, N. Ioannidis, I. T. Christou, M. Papathomas and M. Diorinos, “ARCHEOGUIDE: An Augmented Reality based System for Personalized Tours in Cultural Heritage Sites”, Cultivate Interactive, Issue 1, Jun. 2000. (Electronic journal publication: http://www.cultivate-int.org/issue1/archeo/ )
7. Ioannis T. Christou, Armand Zakarian, Jun-Min Liu and Helen Carter, "A Two Phase Genetic Algorithm for Solving Large Scale Bid-Line Generation Problems", Interfaces 29:5, Sep 1999, pp. 51-65. Special issue on finalist papers for the Daniel H. Wagner Prize.
8. Ioannis T. Christou, Wayne Martin, and Robert R. Meyer, "Genetic Algorithms as Multi-Coordinators in Large Scale Optimization", Institute for Mathematics and its Applications, vol. 111 – Evolutionary Algorithms, Springer-Verlag, 1999. Also Proc. of Evolutionary Algorithms Workshop, eds. L.D. Davis, L.D. Whitley, K. DeJong and M. Vose,1999.
9. Ioannis T. Christou, William W. Donaldson and Robert R. Meyer, "Large Scale Structured Discrete Optimization via Parallel Genetic Algorithms", Institute for Mathematics and its Applications, vol. 109 - Parallel Processing of Discrete Problems, Springer-Verlag, 1998.
10. Jonathan Yackel, Robert R. Meyer and Ioannis T. Christou, "Minimum Perimeter Domain Assignment", Math. Programming, vol. 78, no 2, pp. 283-303, Aug. 1997.
11. Ioannis T. Christou and Robert R. Meyer, "Optimal Equi-partition of Rectangular Domains for Parallel Computation", Journal of Global Optimization, vol. 8, pp. 15-34, Jan. 1996.
    Journal Publications pending review
12.  Ioannis T. Christou, “Exact Method-based Coordination of Cluster Ensembles”, submitted, May, 2008.
13. A.G. Lagodimos and Ioannis T. Christou, “Some Common Properties of Periodic Review Ordering Policies”, submitted, Apr. 2008.
14. Ioannis T. Christou, George Gekas, and Anna Kyrikou, “A Classifier Ensemble Approach to the TV-Viewer Profile Adaptation Problem”, submitted, Aug. 2007.
15.  Ioannis T. Christou et. al., “Grid-based Interactive Virtual Experiments for Distributed Virtual Communities”, submitted, Jul. 2007.
    Book Chapters Publications
16. Ioannis T. Christou et. al., “Grid-based Interactive Virtual Experiments for Distributed Virtual Communities”, in The Learning Grid Handbook, eds. Saverio Salerno et. al., IOS Press, 2008.
17. Stefanos Koutsoutos, Ioannis T. Christou, and Sofoklis Efremidis, “A Classifier Ensemble Approach to Intrusion Detection for Network-Initiated Attacks”, invited contributed chapter in Emerging Artificial Intelligence Applications in Computer Engineering, eds. John Soldatos et al, IOS Press, 2007.
18. Ioannis T. Christou and Robert R. Meyer, "Decomposition Algorithms for Communication Minimization in Parallel Computing", invited contributed chapter in Non-Linear Assignment Problems: Theory & Applications, ed. Panos Pardalos and Leo Pitsoulis, Kluwer Academic Publishers, 2000.
19. Ioannis T. Christou and Robert R. Meyer, "Optimal and Asymptotically Optimal Equi-partition of Rectangular Domains via Stripe Decomposition", in Applied Mathematics and Parallel Computing - Festchrift for Klaus Ritter, eds. H. Fischer, B. Riedmuller, and S. Schaffler, pp. 77-96, Physica-Verlag, 1996.
    Refereed Conference Publications
20. V. Menkovski, Ioannis T. Christou, and S. Efremidis, “Oblique Decision Trees using Embedded Support Vector Machines in Classifier Ensembles”, IEEE Cybernetic Intelligent Systems Conf., London, UK, Sep. 2008.
21. S. Tsekeridou, T. Tiropanis, Ioannis T. Christou, and H. Vakilzadeh, “Toward Virtual Campuses: Collaborative Virtual Labs & Personalized Learning Services in a Real-life Context”, IASTED Web-based Education Conference, Innsbruck, Austria, Mar. 2008.
22.  Ghassan Karame, Ioannis T. Christou and Tassos Dimitriou, “A Secure Hybrid Reputation Management System for Super-Peer Networks”, 5th IEEE Consumer Communications and Networking Conference (IEEE-CCNC), Las Vegas, NV, USA, Jan. 2008.
23. Tassos Dimitriou, Ghassan Karame, and Ioannis T. Christou, “SuperTrust: A Secure and Efficient Framework for Handling Trust in Super Peer Networks”, IEEE CDNC, India, Jan. 2008.
24. Ioannis T. Christou & Sofoklis Efremidis, “An Evolving Oblique Decision Tree Ensemble Architecture for Continuous Learning Applications”, 4th IFIP Intl. Conference on Artificial Intelligence Applications and Innovations, Athens Greece, Sep. 2007.
25.  Ioannis T. Christou, Sofoklis Efremidis, Aikaterini Roukounaki & Marios Anapliotis, “An Intelligent CASE Tool for Porting Mobile Java Applications”, 4th IFIP Intl. Conference on Artificial Intelligence Applications and Innovations, Athens Greece, Sep. 2007.
26. Tassos Dimitriou, Ghassan Karame, and Ioannis T. Christou, “SuperTrust: A Secure and Efficient Framework for Handling Trust in Super Peer Networks”, ACM SIGACT-SIGOPT Conf. on Principles of Distributed Computing (ACM PODC) Brief Announcement, 2007.
27. Ioannis T. Christou, and Spyridon Potamianos, “A Distributed Planning & Control Management Information System for Multi-site Organizations”, Intl. Conf. on Computing Sciences and Software Engineering CISSE 06, Univ. of Bridgeport, Dec. 2006.
28. Anna Pieri, Thanassis Tiropanis, Ioannis T. Christou, Sofia Tsekeridou and Bill Vassiliadis, “Application of a Virtual Scientific Experiment Model in Different Educational Contexts”, e-challenges e-2006 Conf., Barcelona, Spain, Oct. 2006. Published in “Exploiting the Knowledge Economy: Issues, Applications, Case Studies”, Paul Cunningham and Miriam Cunningham (Eds), IOS Press, 2006 Amsterdam, ISBN: 1-58603-682-3
29. Stefanos Koutsoutos, Ioannis T. Christou, and Sofoklis Efremidis, “An Intrusion-Detection System for Network-Initiated Attacks Using a Hybrid Neural Network”. 3rd IFIP Intl. Conference on Artificial Intelligence Applications and Innovations, Athens Greece, May 2006.
30. Ioannis T. Christou, “Load-Balancing Issues in Super-peer-based Pub/Sub Digital Libraries”, Proc. of the 5th IEEE International Conference on Peer-To-Peer Computing, Constanz, Germany, Sep. 2005.
31. Vasilios Vlahakis, John Karigiannis, Manolis Tsotros, Michael Gounaris, Luis Almeida, Didier Stricker, Tim Gleue, Ioannis T. Christou, Renzo Carlucci, Nikos Ioannidis, “ARCHEOGUIDE: First Results from an Augmented Reality, Mobile Computing System in Cultural Heritage Sites”, Proc. of ACM SIGGRAPH Intl. Conference on Computer Graphics and Interactive Techniques VAST 2001: “Virtual Reality, Archaeology, and Cultural Heritage”, pp. 131-140, ACM Press, Athens, Greece, Nov.2001
32. Didier Stricker, John Karigiannis, Ioannis T. Christou, Tim Gleue, Nikos Ioannidis, “Augmented Reality for Visitors of Cultural Heritage Sites”, Proc. of CAST 2001: Intl. Conf. on Artistic, Cultural & Scientific Aspects of Experimental Media Spaces, Bonn, Germany, Sep. 2001.
33. Didier Stricker, Patrick Daehne, Frank Seibert, Ioannis T. Christou, Luis Almeida, Renzo Carlucci and Nikos Ioannidis: “Design & Development Issues in ARCHEOGUIDE: An Augmented Reality based Cultural Heritage On-site Guide”, Proc. of the Intl. Conf. on Augmented Virtual Environments and 3D Imaging (EuroImage 2001), pp. 1-7,IEEE Press, Myconos, Greece, May 2001.
34. Ioannis T. Christou and Armand Zakarian, "Domain Knowledge and Representation Issues in Genetic Algorithms for Scheduling Problems", Proc. of the Genetics and Evolutionary Computation Conference 2000 (GECCO 2000), pp. 681-687, Morgan-Kaufmann Press, Las Vegas, Jun. 2000.
35. Ioannis T. Christou and Robert R. Meyer, "Fast Distributed Genetic Algorithms for Partitioning Uniform Grids", Proc. of the 3rd International Workshop on Parallel Algorithms for Irregularly Structured Problems (Irregular 96). Lecture Notes in Computer Science vol. 1117, Springer-Verlag 1996.
36. Spyros Tzafestas, Paraskevas Dalianis and Ioannis T. Christou, " Diagnosis of Multiple Simultaneous Faults in Complex Systems: An Expert System Implementation for the Automotive Domain", Proc. of the 1st European Congress on Fuzzy and Intelligent Technologies, Aachen, Germany, 1993.
    Technical Reports
37. Ioannis T. Christou, “Graph-based Algorithms for Linked-Data Clustering”.
38. Ioannis T. Christou, “Available-To-Promise Business Scenario: Problem Formulation, Algorithmic Expression and Integration with Open Source ERP Systems”, MBA Thesis AthensMBA Program, National Technical University of Athens and Athens University of Economics and Business, 2006.
39. Ioannis T. Christou, " Distributed Genetic Algorithms for Partitioning Uniform Grids", Ph.D. thesis, UW-Madison, Comp. Sci. Tech. Report MP-TR-96-09. Madison, Wisconsin, 1996.

Nominations/Awards

• 2007: Listed in “Marquis Who’s Who in the World” for 2007,2008.

• July 1998: Nominated for the 1998 Daniel H. Wagner Award for Excellence in Operations Research Practice for the paper "A Two Phase Genetic Algorithm for Large Scale Bidline Generation Problems".

• February 1990: Recipient of an EU-funded scholarship in order to perform research at Salford University, Manchester, UK, on Expert Systems leading to a diploma thesis.

Professional Activities

• Editor of E-Books series. Invited to edit a series of E-Books on Software Applications for Business Intelligence, June 2008.
• Chair, Technical Sessions “Theoretical Advances in AI I & II”, 4th IFIP Intl. AIAI Conf., Sep. 2007, Athens, Greece.
• Member of International Academic Program Committee, “Pervasive Computing Conference”, Dec. 2008, New Delhi, India.
• Member of Programme Committee, 1st Intl Workshop on Distributed Knowledge Management, 2007.
• Member of Programme Committee, Virtual Reality, Archaeology, and Cultural Heritage Intl. Conference VAST 2001, Glyfada Greece, Nov. 28-30, 2001.
• Journal referee for Supply Chain Management: an International Journal, IEEE Transactions on Evolutionary Computation, ORSA Journal on Computing, Optimization Methods and Software, IEEE Transactions on Knowledge and Data Engineering, International Journal of Systems Science.
• Member, IEEE, IEEE Computer Society.
• Member of the Technical Chamber of Greece (registered electrical engineer) 1992 - present.
• Member of the ACM.