A.I.T. - Resident

Resident Professors

ARISTODEMOS PNEVMATIKAKIS - Associate Professor

CONTACT INFO

Name: Aristodemos
Surname: Pnevmatikakis
Place & Date of Birth: Athens, 26/9/1971
Address: Apollonos 10, P.O. Box 202, Ag. Spyridon,19003 Porto Rafti, Markopoulo, Mesogeia Attikis, Greece
Telephones: +30 22990 85706 (home), +30 6682756 (work), +30 97 64857176 (mobile)
E-mail: apne@ait.edu.gr

Dr. Aristodemos Pnevmatikakis is an associate professor at Athens Information Technology. His research interests span the areas of Signal Processing and Communications. Regarding Signal Processing, his research focuses on pattern recognition (emphasizing on audio/visual person identification), detection and tracking (emphasizing on statistical signal processing for people tracking), multimedia processing (emphasizing on still images and video) and data conversion (emphasizing on Delta-Sigma Modulation and interfacing to analog and digital systems). Regarding Communications, his research interests include signal processing for the physical layer (emphasizing on the various WLAN and the WiMAX standards) and RF system level design (determining the necessary circuit specifications, so that transceivers can meet certain system specifications). He is co-author of the book Delta-Sigma Modulators, Modeling, Design and Applications, (Imperial College Press, London, UK, 2003). He has published 18 journal and 25 conference papers, having his work cited 20 times. His research outcomes have been featured on national TV (eLife – ET3, Apr. 2005) and newspapers (Summer 2006), has been demonstrated at COMDEX exhibition (Athens, Nov. 2005), CHIL Technology Day (Berlin, Apr. 2006) and IST Conference (Helsinki, Nov. 2006) and have been evaluated at international evaluation campaigns (CLEAR’06, RT’06). He has been involved in three EU-funded projects (two IST, one ESPRIT) and four projects funded by GSRT (General Secretariat of Research and Technology of Greece).
He received his BSc in Physics from University of Patras, Greece in 1993 and his MSc and PhD from Imperial College, University of London in 1995 and 1999 respectively. Since July 2003, he is with Athens Information Technology. He has been with the Development Programs Dept. of Intracom (2001-2003) and with the Analogue and RF Design Group of Integrated Systems Development (1999-2001).

STUDIES

1/96 – 5/99 Research leading to a Ph.D., supervised by Prof. A. G. Constantinides, in Signal Processing Section, Electrical and Electronic Engineering Dept., Imperial College of Science, Technology and Medicine, University of London. Ph.D. Thesis entitled ‘Modeling, Analysis and Design of Higher-Order Single-Stage Sigma-Delta Modulators’.

10/94 - 10/95 Attending the M.Sc. course entitled ‘Communications and Signal Processing’ in the Electrical and Electronic Engineering Dept., Imperial College of Science, Technology and Medicine, University of London. M.Sc. Thesis entitled ‘Sigma-Delta Modulation: Coders, arithmetic operation circuits and filters’, supervised by Prof. A. G. Constantinides.

12/93 - 10/94 Postgraduate studies in the Dept. of Physics, University of Patras. Research carried out on Delta Modulation IIR filters.

9/93 - 12/93 ‘Using Analogue and Digital Filters in Signal Processing’, seminar organized by the Electronics Laboratory, University of Patras.

6/93 - 7/93 ‘Physics and Technology’, summer School organized by the National Research Center ‘Democritos’.

9/89 - 7/93 Physics Dept., University of Patras (four-year course). Diploma thesis entitled ‘Digital Design using Programmable Logic Devices’, supervised by Prof. T. Deliyannis. Graduation with grade 8.39/10.

9/86 - 6/89 Third General Lyceum of Athens, graduation with grade 19.1/20.

WORKING EXPERIENCE

7/2003 - to date Associate professor (since Nov. 2006), assistant professor (July 2004 to Oct. 2006) and researcher (July 2003 to June 2004) at Athens Information Technology, member of the Autonomic and Grid Computing Group. Supervising the following four researchers:
1. Andreas Stergiou (Jan. 2005 to date): Supervising his research in speaker identification, speaker diarization and face detection, and his implementations of algorithms for the AIT SmartLab. These activities have resulted to 6 publications.
2. George Souretis (Oct. 2005 to Sept. 2006): Supervising his research in face recognition, 3D scene reconstruction and active contours. These activities have resulted to 2 publications.
3. Elias Rentzeperis (Oct. 2005 to date): Supervising his research in face recognition and speech activity detection. These activities have resulted to 2 publications.
4. Vassileios Mylonakis (Oct. 2005 to date): Supervising the implementation of tracking algorithms, that has resulted to 1 publication.

4/2001 – 6/2003 Intracom S.A., Development Programs Department. Development of algorithms and systems, both RF and digital, for WLANs using OFDM.

4/98 – 3/2001 ISD S.A., Analogue & RF Systems Integration Group. Work on circuits and systems for multi-mode wireless transceivers.

5/98 - 11/98 Attached to ST Microelectronics in St. Genis (France) and Geneva (Switzerland). Work with Wireless Terminals Strategic Unit.

1/96 - 12/2003 Collaboration with N. Katsarakis E.E. for the translation and revising of technical specifications and standardization documents in the filed of communications.

Projects

6/2006 - to date ΠΡΙΑΜΟΣ (GSRT), 3rd Framework, section 3.3. Computer vision and statistical signal processing for human-machine interfaces.

5/2004 - 5/2006 PROSTO (GSRT). Teaching appropriately selected target groups on technology topics relating to managing transport traffic and vehicles.

1/2004 - to date CHIL (Computers in the Human Interaction Loop, IST-2002-506909). Fade the computers into the background assisting human-to-human interaction. Involved in work-package 4, Who and Where (Computer Vision).

9/2001 - 4/2005 PERLA (HBT Integrated SiGe Transceiver for Hiperlan, IST-2000-30132). Development of the RF section of a transceiver for HIPERLAN/2 or 802.11a systems. Work-package 4 leader, with the objective of determining the transceiver architecture and the specifications of its components.

5-98 -11/98 PROMURA (PROgrammable Multimode Radio for Multimedia Wireless Terminals, ESPRIT-4 26961). Software radio building blocks in SiGe.

3/96 - 2/98 ΠΕΝΕΔ’95 no. 1318 (GSRT) ‘Usage of switched-capacitor circuits in the design of integrated oversampled analogue-to-digital converters’. The project was funded by the General Secretariat of Research and Technology of Greece.

12/93 - 11/95 ΠΕΝΕΔ’91 no. 757 (GSRT) ‘Design of linear and non-linear filters for Delta modulated signals’. The project was funded by the General Secretariat of Research and Technology of Greece.

Teaching

9/2004 -to date Instructor or co-instructor of the following courses: Advanced Digital Signal Processing, Multimedia Communications, Communication and Digital Signal Processing Systems Design (MSIN, AIT), and Digital Signal Processing, Telecommunication Systems (MsITT, AIT). Supervised the following 11 theses and 11 independent studies that have led to 3 publications:
1. Elias Rentzeperis, ‘A Comparative Analysis of Face Recognition Algorithms: Hidden Markov Models, Correlation Filters and Laplacianfaces vs. Linear subspace projection and Elastic Bunch Graph Matching’, MSIN thesis, Spring 2005, work resulted to 1 publication.
2. G. Souretis, ‘Face Recognition using Kernel Methods’, MSIN, Fall 2005.
3. I. Vazeos, ‘Active Appearance Models’, MSIN thesis, Fall 2005.
4. N. Katsarakis, ‘Adaptive background segmentation and shadow detection for video streams’, MSIN thesis, Fall 2005.
5. I. Zafar, ‘Person tracking using the CONDENSATION algorithm’, MSIN thesis, Fall 2005.
6. G. Genaro, ‘Fusing Information for Audio-Visual Person Localization and Tracking’, MsITT thesis, Summer 2005.
7. J. Kokkoris, ‘Designing an Inertial Navigation System’, MsITT thesis, begun Fall 2005.
8. Andreas Stergiou, ‘Face Recognition by Elastic Bunch Graph Matching’, MSIN thesis, Summer-Fall 2004, work resulted to 1 publication.
9. Panos Kasianidis, ‘Tracking a Speaker using a Microphone Array and a PTZ Camera’, MSIN thesis, Fall 2004.
10. Petros Skouloudakis, ‘Synchronization for IEEE802.11a’, MSIN thesis, Fall 2004.
11. Ioannis Papagrigorakis, ‘Face tracking using active contour deformable templates’, MSIN thesis, Fall 2004.
12. G. Karame, ‘Face Tracking using Boosting and Color’, MSIN independent study, Fall 2006.
13. N. Thomos, ‘Background Segmentation for Moving Cameras’, MSIN independent study, Fall 2006.
14. V. Mylonakis, ‘Global Capturing Application Programming Interface’, MSIN independent study, Fall 2005.
15. G. Souretis, ‘Learning chaotic dynamics with neural networks’, MSIN independent study, Fall 2005.
16. I. Vazeos, ‘Video segmentation using the pixel persistence map’, MSIN independent study, Fall 2005.
17. N. Katsarakis, ‘Fusing Audio and Video for Person Tracking’, MSIN independent study, co-supervisor with F. Talantzis, Fall 2005, work resulted to 1 publication.
18. J. Kokkoris, ‘Camera calibration for 3D localization’, MsITT independent study, Summer 2005.
19. Lazar Adzigogov, ‘Face Detection using Skin Color Models’, MSIN independent study, Summer 2004.
20. Panos Kasianidis, ‘Face Detection using Subspace Projection’, MSIN independent study, Summer-Fall 2004.
21. Andreas Stergiou, ‘Speaker Identification’, MSIN independent study, Fall 2004.
22. Zeta Bakirtzoglou, ‘Subspace Projection Face Recognition’, MSIN independent study, Fall 2004.

2/2003 - 8/2004 Research assistant, Advanced Digital Signal Processing, Multimedia Communications, Communication and Digital Signal Processing Systems courses (MsIN, AIT).

11/96 - 2/97 Instructor, Digital Signal Processing course, M.Sc. in Medical Physics, Dept. of Medicine, University of Patras.

9/93 - 3/98 Laboratory assistant, Basic Electronics and Analog Electronics courses, Dept. of Physics, University of Patras.

COMPUTING EXPERIENCE

Systems’ (analogue and digital) simulation and analysis using MATLAB and SIMULINK.
Design and simulation of RF systems and circuits using HP ADS (training by HP).
Digital systems’ design using VHDL.
Circuit design and layout using CADENCE (training by ST Microelectronics on their BiCMOS6G technology) and Mentor Graphics.
Programming in C++, FORTRAN and PASCAL.

LANGUAGES

Greek as native language.
Fluent in English: Cambridge Proficiency, grade C (June 1986) and TOEFL, grade 553/667 (June 1993)
Moderate knowledge of German.

PUBLICATIONS - BOOKS

1. G. Bourdopoulos, A. Pnevmatikakis, V. Anastassopoulos and T. Deliyannis, ‘Delta-Sigma Modulators, Modeling, Design and Applications’, World Scientific Publication Company, Imperial College Press, Sept. 2003. (496 copies sold, 4 citations)

Publications - Journals

Sigma-Delta

A. Pneumatikakis, V. Anastassopoulos and T. Deliyannis, ‘Realization of a High Order IIR Delta Sigma Filter’, Int. J. Electronics, vol. 78, no. 6, pp.1071-1089, June 1995.
A. Pneumatikakis, A. Constantinides, V. Anastassopoulos and T. Deliyannis, ‘Sigma-Delta IIR Filter Realization’, J. Circuits, Systems and Computers, vol 8, no 4 (1998), pp. 461-472.
A. Pneumatikakis, A. Constantinides, G. Bourdopoulos and T. Deliyannis, ‘Stabilization of Third-Order Single-Stage Sigma-Delta Modulators’, Circuits, Systems and Signal Processing, vol. 18, no. 2, pp.149-168, 1999. (1 citation)
G. Bourdopoulos, A. Pnevmatikakis and T. Deliyannis, ‘Numerical Method for Determining the Quantization Error PDF of Single-Bit Sigma-Delta Modulators’, IEEE Trans. Circuits and Systems – I: Regular Papers, vol. 51, no. 4, pp. 718-731, April 2004. (1 citation)RF System-level Design

RF System-level Design
A. Pneumatikakis, L. Dermentzoglou, A. Arapoyanni and I. Moisiadis, ‘Image Rejection Receiver Architectures for Multi-Standard TDMA Applications’, RFdesin Magazine, May 2000, pp. 28-37.
A. Pneumatikakis, L. Dermentzoglou and A. Arapoyanni, ‘Analog-to-Digital Interface in Heterodyne Receivers’, J. Circuits, Systems and Computers, pp. 57-72, Jan 2002.

OFDM Modem

7.S. Blionas, K. Masselos, C. Dre, F. Ieromnimon, T. Pagonis, A. Pnevmatikakis, A. Tatsaki, T.Trimis, A. Vontzalidis and D. Metafas, ‘Prototyping of a 5GHz WLAN Reconfigurable System-on-Chip’, IECE Trans. Electron., Vol.E86-D, No.5, pp. 901-909, May 2003. (4 citations)
8. A. Pnevmatikakis, S. Blionas and D. Triantis, ‘Physical Layer of Base-Band OFDM Modem – Algorithms and Performance’, J. Circuits, Systems and Computers, vol. 14, no.3, June 2005. (1 citation)Context from Video

Context from Video

9. A. Pnevmatikakis and L. Polymenakos, ‘A testing methodology for face recognition algorithms’, in S. Renals and S. Bengio (Eds.): MLMI 2005, Lecture Notes in Computer Science 3869, pp. 218-229, Springer-Verlag, Berlin Heidelberg, 2006.
10. A. Pnevmatikakis and L. Polymenakos, ‘2D Multi-Person Tracking Using Kalman Filtering and Adaptive Background Learning in a Feedback Loop’, in R. Stiefelhagen and J. Garofolo (eds.): CLEAR 2006, Lecture Notes in Computer Science 4122, Springer-Verlag, Berlin Heidelberg, 2006.
11. N. Katsarakis, G. Souretis, F. Talantzis, A. Pnevmatikakis and L. Polymenakos, ‘3D Audiovisual Person Tracking Using Kalman Filtering and Information Theory’, in R. Stiefelhagen and J. Garofolo (eds.): CLEAR 2006, Lecture Notes in Computer Science 4122, Springer-Verlag, Berlin Heidelberg, 2006.
12. A. Stergiou, A. Pnevmatikakis and L. Polymenakos, ‘A Decision Fusion System across Time and Classifiers for Audio-visual Person Identification’, in R. Stiefelhagen and J. Garofolo (eds.): CLEAR 2006, Lecture Notes in Computer Science 4122, Springer-Verlag, Berlin Heidelberg, 2006.
13. A. Pnevmatikakis, L. Polymenakos and V. Mylonakis, ‘The AIT Outdoors Tracking System for Pedestrians and Vehicles’, in R. Stiefelhagen and J. Garofolo (eds.): CLEAR 2006, Lecture Notes in Computer Science 4122, Springer-Verlag, Berlin Heidelberg, 2006.
14. A. Pnevmatikakis and L. Polymenakos, ‘Kalman Tracking with Target Feedback on Adaptive Background Learning’, in S. Renals, S. Bengio and J. Fiscus (Eds.): MLMI 2006, Lecture Notes in Computer Science 4299, Springer-Verlag, Berlin Heidelberg, pp. 114-122, 2006.
15. E. Rentzeperis, A. Stergiou, A. Pnevmatikakis and L. Polymenakos, ‘Impact of Face Registration Errors on Recognition’, in I. Maglogiannis, K. Karpouzis and M. Bramer (eds.), Artificial Intelligence Applications and Innovations (AIAI06), Springer, Berlin Heidelberg, pp. 187-194, June 2006.
16. A. Pnevmatikakis, F. Talantzis, J. Soldatos and L. Polymenakos, ‘Robust Multimodal Audio-Visual Processing for Advanced Context Awareness in Smart Spaces’, in I. Maglogiannis, K. Karpouzis and M. Bramer (eds.), Artificial Intelligence Applications and Innovations (AIAI06), Springer, Berlin Heidelberg, pp. 290-301, June 2006.
17. E. Rentzeperis, A. Stergiou, C. Boukis, A. Pnevmatikakis and L. Polymenakos, ‘The 2006 Athens Information Technology Speech Activity Detection and Speaker Diarizaton Systems’, in R. Stiefelhagen and J. Garofolo (eds.): RT’06, Lecture Notes in Computer Science, Springer-Verlag, Berlin Heidelberg.
18. A. Pnevmatikakis and L. Polymenakos, ‘A weighted voting scheme for blind post-decision fusion’, International Journal of Pattern Recognition and Artificial Intelligence, submitted.
19. A. Pnevmatikakis, F. Talantzis, J. Soldatos and L. Polymenakos, ‘Robust Multimodal Audio-Visual Processing for Advanced Context Awareness in Smart Spaces’, Personal and Ubiquitous Computing, accepted.

Publications - Conferences

Sigma-Delta

1. A. Pneumatikakis, V. Anastassopoulos and T. Deliyannis, ‘High Order ΣΔ IIR Filter Realization’, Proceedings of ECCTD’95, vol. 2, pp. 663-666, Aug. 1995. (1 citation)
2. A. Pneumatikakis and T. Deliyannis, ‘Direct Processing of Sigma-Delta Signals’, Proceedings of ICECS’96, vol. 1, pp. 13-16, Oct. 1996.
3. G. Bourdopoulos, A. Pneumatikakis and T. Deliyannis, ‘Second-Order Sigma-Delta Modulator Realization’, Proceedings of ICECS’96, vol. 1, pp. 85-88, Oct. 1996.
4. A. Pneumatikakis, A. Constantinides and T. Deliyannis, ‘Optimization for Sigma-Delta Modulators’, Proceedings of DSP’97, pp. 661-664, July 1997.
5. A. Pneumatikakis, A. Constantinides and T. Deliyannis, ‘Stabilization of Third-Order Single-Stage Sigma-Delta Modulators’, Proceedings of ECCTD’97, vol. 3, pp. 1480-1483, Aug. 1997.
6. G. Bourdopoulos, A. Pneumatikakis and T. Deliyannis, ‘Generalized Linear Model for ΣΔ Modulators’, Proceedings of ICECS’98, vol. 2, pp. 275-278 1998.
7. A. Pneumatikakis, G. Bourdopoulos, A. Consantinides and T. Deliyannis, ‘A Class of Reliable ΣΔ Modulators’, Proceedings of IMACS-CSC’98, vol 1, pp. 317-321, Oct. 1998.
8. G. Bourdopoulos, A. Pneumatikakis and T. Deliyannis, ‘Optimal NTFs for Single-Bit ΣΔ Modulators’, Proceedings of DSP 2002, pp. 877-880, July 2002.

RF System-level Design

9. G. Galanis, A. Pneumatikakis, L. Dermentzoglou, A. Arapoyanni and I. Moisiadis, ‘Building Block Specifications for Multi-mode Receivers’ Proceedings of IMACS-CSC’99, July 1999.
10. L. Dermentzoglou, A. Arapoyanni and A. Pneumatikakis, ‘A direct conversion Receiver Analysis For Multimode TDMA Applications’, Proceedings of MELECON2000, Vol.1, pp. 318-321, Cyprus, May 2000. (4 citations)
11. A. Pneumatikakis, L. Dermentzoglou, A. Arapoyanni and I. Moisiadis, ‘A 900MHz / 1800MHz / 1900MHz Superhet Receiver Engaging High IF1 For Image Rejection’, Proceedings of ICCDCS2000, Caracas Mexico, March 2000, pp. T21-1 to T21-6. (1 citation)
12. L. Dermentzoglou, A. Pneumatikakis, A. Arapoyanni and I. Moisiadis, ‘A Multi-Mode Extra High IF1 Image Rejection Receiver for TDMA’, Proceedings of ICECS2000, Beirut Lebanon, Dec. 2000.

OFDM Modem

13. S. Blionas, K. Masselos, C. Dre, C. Drosos, F. Ieromnimon, T. Pagonis, A. Pneymatikakis, A. Tatsaki, T.Trimis, A. Vontzalidis and D. Metafas “A HIPERLAN/2 – IEEE 802.11a Reconfigurable System-on-Chip”, 2002 International Conference on Field Programmable Logic and Applications (FPL 2002). (1 citation)
14. S. Blionas, K. Masselos, C. Dre, F. Ieromnimon, T. Pagonis, A. Pneymatikakis, A. Tatsaki, T.Trimis, A. Vontzalidis and D. Metafas, “Design Story: A Hiperlan2/IEEE802.11x Reconfigurable SoC for indoor WLANs and outdoor wireless links. A pilot project for the future generation configurable wireless communications products”, Workshop on Heterogeneous Reconfigurable Systems on Chip, Chances, Application, Trends, April 2002. (1 citation)

Context from Video

15. A. Pnevmatikakis and L. Polymenakos, ‘Comparison of Eigenface-Based Feature Vectors under Different Impairments’, Int. Conf. Pattern Recognition 2004, vol. 1, pp. 296-300, Aug. 2004.
16. J. Soldatos, L. Polymenakos, A. Pnevmatikakis, F. Talantzis, K. Stamatis and M. Carras, 'Perceptual Interfaces and Distributed Agents supporting Ubiquitous Computing Services', Eurescom 2005.
17. S. Azodolmolky, N. Dimakis, V. Mylonakis, G. Souretis, J. Soldatos, A. Pnevmatikakis and L. Polymenakos, ‘Middleware for In-door Ambient Intelligence: The PolyOmaton System’, NGNM05.
18. A. Pnevmatikakis and L. Polymenakos, ‘An Automatic Face Detection and Recognition System for Video Streams’ 2nd Joint Workshop on Multi-Modal Interaction and Related Machine Learning Algorithms, Edinburgh, UK, July 2005.
19. A. Stergiou, A. Pnevmatikakis and L. Polymenakos, ‘Audio/Visual Person Identification’ 2nd Joint Workshop on Multi-Modal Interaction and Related Machine Learning Algorithms, Edinburgh, UK, July 2005.
20. A. Stergiou, A. Pnevmatikakis and L. Polymenakos, ‘EBGM Vs Subspace Projection for Face Recognition’ International Conference on Computer Vision Theory and Applications, Setúbal, Portugal, Vol. 2, pp. 131-137, Feb. 2006.
21. H. Ekenel and A. Pnevmatikakis, ‘Video-Based Face Recognition Evaluation in the CHIL Project – Run 1’, Face and Gesture Recognition 2006, Southampton, UK, pp. 85-90, Apr. 2006. (1 citation)
22. E. Rentzeperis, A. Stergiou, C. Boukis, G. Souretis, A. Pnevmatikakis and L. Polymenakos, ‘An Adaptive Speech Activity Detector Based on Signal Energy and LDA’, 3rd Joint Workshop on Multi-Modal Interaction and Related Machine Learning Algorithms.
23. A. Stergiou, A. Pnevmatikakis and L. Polymenakos, ‘Enhancing the Performance of a GMM-based Speaker Identification System in a Multi-Microphone Setup’, InrterSpeech 2006, Pitsburgh, USA, Sept. 2006.
24. F. Talantzis, A. Pnevmatikakis and L. Polymenakos, ‘An Automatic Face Detection and Recognition System for Video Streams’, IEEE International Workshop on Multimedia Signal Processing ( MMSP 2006), Victoria, Canada, Oct. 2006.
25. A. Pnevmatikakis and L. Polymenakos, ‘Robust Estimation of Background for Fixed Cameras’, 15th International Conference on Computing (CIC2006), accepted.