Eğitim
· B.Sc.: Department of Electrical and Electronics Engineering, METU, 1979.
· M.Sc.: Department of Mathematics, METU, 1982.
· Ph.D.: Department of Mathematics, METU, 1988.
Araştırma Konuları
- Optimization: theory and practice
- Optimal control of distributed parameter systems
- Unmanned underwater-air vehicles
- Expert System Design
- Image processing (in particular, multi-scale and variational approaches in image processing)
- Process control
- Intelligent control
- Inverse problems (in particular, system identification problems)
- Time-frequency and wavelet transforms, and their applications in signal processing
- Observer and controller design techniques for nonlinear systems
- Flight control
- Walking robots
- Decision making systems
- Development of courses for asynchronous and distance education
Yayınlar
INTERNATIONAL JOURNAL PUBLICATIONS I (included in ISI citation index)
1. M. Baskin, M.K. Leblebicioğlu, “Robust control for line-of-sight stabilization of a two-axis gimbal system”, Turkish Journal of Electrical Engineering & Computer Sciences, Available online: 16.04.2017, DOI: 10.3906/elk-1606-435.
2. E.T. Ceran, T. Erkilic, E. Uysal-Biyikoglu, T. Girici and K. Leblebicioglu, “Optimal energy allocation policies for a high altitude flying wireless access point”, Transactions on Emerging Telecommunications Technologies, vol. 28, Issue 4, April 2017.
3. F. Çakıcı, M.K. Leblebicioğlu, “Design and Analysis of a Mode-Switching Micro Unmanned Aerial Vehicle”, International Journal of Micro Air Vehicles, vol. 8, no. 4, pp. 221-229, 2016.
4. İ. Durgut, M.K. Leblebicioğlu, “State Estimation of Transient Flow in Gas Pipelines by a Kalman Filter-based Estimator”, Journal of Natural Gas Science and Engineering, vol. 35, pp. 189-196, 2016.
5. G. Özdoğan, K. Leblebicioğlu, “Frequency response function measurement and parametric SISO system modelling of a gyro-stabilized infrared electro optic gimbal system”, Transactions of the Institute of Measurement and Control, vol. 38, no. 5, SI., pp. 512-528, May 2016.
6. F. Çakıcı, H. Ergezer, U. Irmak, K. Leblebicioğlu, “Coordinated guidance for multiple UAVs”, Transactions of the Institute of Measurement and Control, vol. 38, no. 5, SI., pp. 593-601, May 2016.
7. F. Yaman, A.E. Yılmaz, K. Leblebicioğlu, “Approximation based curvilinear local search for optimization problems”, Engineering Computations, vol. 33, no. 2, pp. 482-506, 2016.
8. H. Saç, K. Leblebicioğlu, G.B. Akar, “2 D High Frequency Forward Looking Sonar Simulator”, Turkish Journal of Electrical Engineering & Computer Sciences, vol. 23, pp. 279-297, 2015.
9. U. Beldek, K. Leblebicioğlu, “A new systematic and flexible method for developing hierarchical decision-making models”, Turkish Journal of Electrical Engineering & Computer Sciences, vol. 23, no. 1, pp. 279-297, 2015.
10. Y.A. Özkan, A. Saranlı, Y. Yazıcıoğlu, U. Saranlı, K. Leblebicioğlu, “Optimal Control of a Half-circular Compliant Legged Monopod”, Control Engineering Practice, vol. 33, pp. 10-21, 2014.
11. D. Avcı, K. Leblebicioğlu, M. Poyraz and E. Doğantekin, “A New Method Based on Adaptive Discrete Wavelet Entropy Energy and Neural Network Classifier (ADWEENN) for Recognition of Urine Cells from Microscopic Images Independent of Rotation and Scaling”, Journal of Medical Systems, vol. 38, no.2, 2014.
12. A. Şahin, K. Leblebicioğlu, “Approximating the optimal mapping for weapon target assignment by fuzzy reasoning”, INFORMATION SCIENCES, vol. 255, pp. 30-44, 2014.
13. H. Ergezer, K. Leblebicioğlu, “3D Path Planning for Multiple UAVs for Maximum Information Collection”, Journal of Intelligent and Robotic Systems, vol. 73, Issue 1-4 Special Issue, SI, pp. 737-762, Jan. 2014.
14. N. Tekbıyık, T. Girici, E. Uysal-Bıyıkoğlu, K. Leblebicioğlu, “Proportional Fair Resource Allocation on an Energy Harvesting Downlink”, IEEE Trans. on Wireless Communications, vol. 12, no.4, pp. 1699-1711, 2013.
15. H. Ergezer, K. Leblebicioğlu, “Path Planning for UAVs for Maximum Information Collection Using Evolutionary Computation”, IEEE Transactions on Aerospace and Electronic Systems, vol. 49, no.1, pp. 502-520, Jan. 2013.
16. E. Kılıç, K. Leblebicioğlu, “From classic observability to a simple fuzzy observability for fuzzy discrete-event systems”, INFORMATION SCIENCES, vol. 187, pp. 224-232, 2012.
17. Z. Deprem, K. Leblebicioğlu, O. Arıkan, A.E. Çetin, “A Complexity-Reduced ML Parametric Signal Reconstruction Method”, EURASIP Journal on Advances in Signal Processing, Article ID 875132, 2011.
18. Ş. Sinan, K. Leblebicioğlu, E.G. Schmidt, “INtERCEDE: An algorithmic approach to networked control system design”, Journal of Network and Computer Applications, vol. 34, no. 4, Special Issue: SI, pp. 1326-1341, 2011.
19. N. Köse, Ö. Salor, K. Leblebicioğlu, “Kalman filtering based approach for light flicker evaluation of power systems”, IET Generation Transmission & Distribution, vol. 5, no. 1, pp. 57-69, 2011.
20. N. Köse, Ö. Salor, K. Leblebicioğlu, “Interharmonics analysis of power signals with fundamental frequency deviation using Kalman filtering”, Electric Power Systems Research, vol. 80, no. 9, pp. 1145-1153, 2010.
21. S. Çaylar, G. Dural, K. Leblebicioğlu, “Neural Network Method for the Direction of Arrival Estimation with Uniform Cylindrical Microstrip Patch Array”, IET Microwaves Antennas & Propagation, vol. 4, no. 2, pp. 153-161, 2010.
22. U. Beldek, K. Leblebicioğlu, “Local Decision Making and Decision Fusion in Hierarchical Levels”, TOP, vol. 17, no. 1, pp. 44-69, 2009.
23. M.S. Erden, K. Leblebicioğlu, “Free Gait Generation with Reinforcement Learning for a Six-Legged Robot”, Robotics and Autonomous Systems, vol. 5, no. 3, pp. 199-212, 2008.
24. H.B. Ertan, K. Leblebicioğlu, B. Avenoğlu, M. Pirgaip, “High-Frequency Loss Calculation in a Smooth Rotor Induction Motor Using FEM”, IEEE Trans. on Energy Conversion, vol. 22, no. 3, pp. 566-575, 2007.
25. M.S. Erden, K. Leblebicioğlu, “Analysis of Wave Gaits for Energy Efficiency”, Autonomous Robots, vol. 23, pp. 213-230, 2007.
26. M.S. Erden, K. Leblebicioğlu, “Torque Distribution in a Six-Legged Robot”, IEEE Trans. on Robotics, vol. 23, pp. 179-186, 2007.
27. U. Beldek, K. Leblebicioğlu, "Strategy creation, decomposition and distribution in particle navigation", Information Sciences, vol. 177, pp. 755-770, 2007.
28. S. Çaylar, K. Leblebicioğlu, G. Dural, “A new neural network approach to the target tracking problem with smart structure,” Radio Science, vol. 41, no. 5, Art. No. RS5004, Oct. 3, 2006.
29. E. Kılıç, Ç. Karasu, K. Leblebicioğlu, "Fault diagnosis with dynamic fuzzy discrete event system approach", Lecture Notes in Artificial Intelligence, vol. 3949, pp. 117-124, 2006.
30. H. Ergezer, K. Leblebicioğlu, "Refining the progressive multiple sequence alignment score using genetic algorithms", Lecture Notes in Artificial Intelligence, vol. 3949, pp. 177-184, 2006.
31. U. Yıldız, U.A. Gürkan, C. Özgen, K. Leblebicioğlu, “State Estimator Design for Multicomponent Batch Distillation Columns”, Chemical Engineering Research and Design, vol. 83, no. A5, pp. 1-12, 2005.
32. İ. Ulusoy, U. Halıcı, K. Leblebicioğlu, “3D Cognitive Map Construction by Active Stereo Vision in a Virtual World”, Lecture Notes in Computer Science, Springer Verlag, Heidelberg, vol. 3280, 2004.
33. A. Bahar, C. Özgen, K. Leblebicioğlu, U. Halıcı, “Artificial Neural Network Estimator Design for the Inferential Model Predictive Control of an Industrial Distillation Column”, Industrial & Engineering Chemistry Research, vol. 43, no. 19, pp. 6102-6111, Sep. 2004.
34. İ. Ulusoy, U. Halıcı, E. Nalçacı, İ. Anaç, K. Leblebicioğlu, C. Basar-Eroglu,”Time-frequency analysis of visual evoked potentials for interhemispheric transfer time and proportion in callosal fibers of different diameters”, Biological Cybernetics, vol. 90, no. 4, pp. 291-301, 2004.
35. M.S. Erden, K. Leblebicioğlu, U. Halıcı, “Multi-agent system-based fuzzy controller design with genetic tuning for a mobile manipulator robot in the hand over task”, Journal of Intelligent & Robotic Systems, vol. 39, no. 3, pp. 287-306, 2004.
36. Ş. Erkoç, K. Leblebicioğlu, U. Halıcı, “Application of genetic algorithms to geometry optimization of microclusters: A comparative study of empirical potential energy functions for silicon", Mater. Manuf. Processes, vol. 18, no. 3, pp. 329-339, 2003.
37. K. Leblebicioğlu, U. Halıcı, O. Çelebi, “Infinite Dimensional Hopfield Neural Networks”, Nonlinear Analysis: Theory, Methods & Applications, vol. 47, pp. 5807-5813, 2001.
38. G. Ongun, U. Halıcı, K. Leblebicioğlu, V. Atalay, S. Beksaç, M. Beksaç, “Automated Contour Detection in Blood Cell Images: An Efficient Snake Algorithm”, Nonlinear Analysis Theory, Methods &Applications, vol. 47, pp. 5839-5847, 2001.
39. F. Şahin, H.B. Ertan, K. Leblebicioğlu, “Optimum Geometry for Torque Ripple Minimization of Switched Reluctance Motors”, IEEE Trans. Energy Conversion, vol.15, no. 1, pp. 30-39, 2000.
40. G. Sayan-Turhan, K. Leblebicioğlu, and T. İnce, “Electromagnetic Target Classification Using Time-Frequency Analysis and Neural Networks”, Microwave and Optical Technology Letters, vol. 21, no. 1, pp. 63-69, 1999.
41. L. Alatan, M. Aksun, K. Leblebicioğlu, and T. Birand, “Use of Computationally Efficient MOM in the Optimization of Printed Antennas”, IEEE Trans on Antennas and Propagation, vol. 47, no. 4, pp. 725-732, 1999.
42. H. B. Ertan, K. Leblebicioğlu, B. Şimşir, S. Hamarat, A. Çekiç, M. Pirgaip, “Design Optimization of Variable-Frequency Driven Three Phase Induction Motors”, Compel; The International Journal for Computation and Mathematics in Electrical and Electronic Engineering, vol. 17, no. 1/2/3, pp. 135-140, MCB University Press, 1998.
43. G. Sayan-Turhan, K. Leblebicioğlu, and S. İnan, “Input Signal Shaping for Target Identification Using Genetic Algorithms”, Microwave and Optical Technology Letters, vol. 17, no. 2, pp. 128-132, Feb. 1998.
44. K. Leblebicioğlu, U. Halıcı, “Infinite Dimensional Radial Basis Function Neural Networks for Nonlinear Transformations on Function Spaces”, Nonlinear Analysis, vol. 30, no. 3, pp. 1649-1654, Dec. 1997. (This paper is also presented in the "World Congress on Nonlinear Analysis, 1996, Athens, Greece, August 1996").
45. İ. Durgut, K. Leblebicioğlu, “Kalman filter based observer design around optimal control policy for gas pipelines”, Int. J. for Numerical Methods in Fluids, vol. 24, pp. 233-245, 1997.
46. İ. Durgut, K. Leblebicioğlu, “Optimal control of gas pipelines via infinite dimensional analysis”, Int. J. for Numerical Methods in Fluids, vol. 22, pp. 867-879, 1996.
47. M. Kuzuoğlu, K. Leblebicioğlu, “Infinite Dimensional Multilayer Perceptrons”, IEEE Trans. on Neural Networks, vol. 7, no. 4, pp. 889-896, 1996.
48. F. Şahin, H. B. Ertan, K. Leblebicioğlu, “Optimum Geometry for Torque Ripple Minimization of Switched Reluctance Motors”, Compel, vol. 14, no. 4, pp. 117-121, 1995.
49. Y. Z. İder, M. Eyüboğlu, M. Kuzuoğlu, K. Leblebicioğlu, U. Baysal, B. K. Çağlar, Ö. Birgül, “Method for Comperative Evaluation of EIT Algorithms Using Standard Data Sets”, Physiol. Meas., vol. 16, pp. A227-A236, 1995.
50. M.K. Pidcock, M. Kuzuoğlu, K. Leblebicioğlu, “Analytical and Semi-analytical Solutions in Electrical Impedance Tomography I: Two Dimensional Problems”, Physiol. Meas., vol. 16, pp. 77-90, 1995.
51. M.K. Pidcock, M. Kuzuoğlu, K. Leblebicioğlu, “Analytical and Semi-analytical Solutions in Electrical Impedance Tomography II: Three Dimensional Problems”, Physiol. Meas., vol. 16, pp. 91-110, 1995.
52. M. Kuzuoğlu, K. Leblebicioğlu, Y.Z. İder, “A Fast Image Reconstruction Algorithm for Electrical Impedance Tomography”, Physiol. Meas., vol. 15, pp. A115-A124, 1994.
53. O. Sevaioğlu, M. Eskicioğlu, K. Leblebicioğlu, “Optimal Ranking of Measurements for State Estimation by the Gradient Projection Method”, Electrical Power and Energy Systems, vol. 14, no. 6, pp. 375-382, December 1992.
54. K. Leblebicioğlu, O. Çelebi, “An Optimal Control Problem with Nonlinear Elliptic State Equations”, Journal of Mathematical Analysis and Applications, vol. 164, no. 1, pp. 178-205, February 1992.
INTERNATIONAL JOURNAL PUBLICATIONS II (not included in ISI citation index)
1. B. Yüksel, K. Leblebicioğlu, “Toward the enhancement of biped locomotion and control techniques: walking pattern classification”, Artif. Life Robotics, vol. 16, pp. 208-213, 2011, (This work was presented in part and awarded Best Paper Award at the 16th International Symposium on Artificial Life and Robotics, Oita, Japan, January 27–29, 2011).
2. F. Çakıcı, K. Leblebicioğlu, “Modelling and Simulation of a Small-sized Tiltrotor UAV”, JMDS, vol. 9, no. 4, pp. 35-45, 2011.
3. U. Halıcı, K. Leblebicioğlu, L.C. Jain, “Training Radial Basis Function Neural Networks Through Parabolic Evolutionary Algorithm”, International Journal of Knowledge-Based Intelligent Engineering Systems, vol. 5, no. 3, July 2001.
4. U. Halıcı, K. Leblebicioğlu, ``Parabolic Evolutionary Algorithms'', Romanian J. of Information Science and Technology, vol. 1, no. 3, 1998.
5. H.B. Ertan, K. Leblebicioğlu, S. Hamarat, ``Design optimization of double-speed and variable-frequency driven induction motors'', Electromotion, vol. 4, no. 1-2, pp. 38-43, Jan. 1997. (This paper is also presented in the conference "Electromotion'97, 8-9 May, 1997, Cluj-Napoca, Romania", as an invited paper).
BOOK SECTIONS
1. H. Ergezer and K. Leblebicioğlu, “Anomaly detection and activity perception using covariance descriptor for trajectories,” in European Conference on Computer Vision, Springer International Publishing, LNCS 9914, pp. 728–742, 2016.
2. N. Tekbıyık, T. Girici, E. Uysal-Bıyıkoğlu, K. Leblebicioğlu, “Utility-Based Time and Power Allocation on an Energy Harvesting Downlink: The Optimal Solution”, in“Computer and Information Sciences III (27th International Symposium on Computer and Information Sciences)”, Editors: Erol Gelenbe, Ricardo Lent, ISBN: 978-1-4471-4593-6, Springer Berlin Heidelberg, 2013.
3. N. Tekbıyık, T. Girici, E. Uysal-Bıyıkoğlu, K. Leblebicioğlu, “An Algorithm for Proportional-Fair Downlink Scheduling in the Presence of Energy Harvesting”, in “Computer and Information Sciences III (27th International Symposium on Computer and Information Sciences)”, Editors: Erol Gelenbe, Ricardo Lent, ISBN: 978-1-4471-4593-6, Springer Berlin Heidelberg, 2013.
4. R. Tekin, Ö. Ateşoğlu, K. Leblebicioğlu, “Flight Control Algorithms for a Vertical Launch Air Defense Missile“, in “Advances in Aerospace Guidance, Navigation and Control” (Selected Papers of the Second CEAS Specialist Conference on Guidance, Navigation and Control), Editors: Qiping Chu, Bob Mulder, Daniel Choukroun, Erik-Jan van Kampen, Coen de Visser, Gertjan Looye, ISBN: 978-3-642-38252-9, Springer Berlin Heidelberg, 2013.
5. M.S. Erden, K. Leblebicioğlu, “Multilegged Walking in Robotics and Dynamic Gait Pattern Generation for a Six-Legged Robot with Reinforcement Learning”, in “Mobile Robots: New Research”, edited by J.X. Liu, pp. 291-316, Nova Publishers, ISBN: 1-59454-359-3, 2005.
6. U. Halıcı, K. Leblebicioğlu, C. Özgen, S. Tuncay, “Recent Advances in Neural Network Applications in Process Control”, chapter 8 in “The Recent Advances in Artificial Neural Networks: Design and Applications” edited by L.C. Jain, A.M. Farelli, CRC Press, USA, 2000.
7. S. Beksaç, A. Erkmen, A. Aksel, U. Halıcı, K. Leblebicioğlu, M. Beksaç, V. Atalay, L.C. Jain, “Diagnostic Systems in Medicine”, in “Soft Computing Techniques in Human Related Sciences”, CRC Press, USA, April, 1999, ISBN-0-8493-1635-9, 1999.
NATIONAL JOURNAL PUBLICATIONS
1. K. Leblebicioğlu, “ULİSAR: Bir İnsansız Su Altı Aracı”, Savunma Sanayi Gündemi Dergisi, cilt 12, no. 2, sayfa 40-46, 2010.
2. Y. Kösehan, K. Leblebicioğlu, “Mayın Tarlası Oluşturma Problemine Genetik Algoritma Yaklaşımı”, Savunma Bilimleri Dergisi, Kara Harp Okulu, cilt 2, no. 2, sayfa 34-56, 2003.
3. E. Kılıç, K. Leblebicioğlu, U. Halıcı, “Bulanık Renkli Petri Ağı Kullanarak Asenkron Motorda Hata Teşhis ve Tesbiti”, Endüstri ve Otomasyon Dergisi, sayı 61, sayfa 42-47, Nisan 2002.
4. H. Aksoy, K. Leblebicioğlu, “Bulanık Sinir Sistemleri Kullanılarak İMKB 100 Endeksinin Modellenmesi”, Maliye Yazıları, no. 71, sayfa 26-65, Nisan-Haziran, 2001.
Projeler
- · Teknokent Projesi: “Sualtı Akustik Haberleşme Sisteminin Modellenmesi, Tasarımı ve Geliştirilmesi, Sualtı Araçlarının Otopilotlarının Tasarlanması ve Güdüm Algoritmaları”, Desistek LTD., 15 Temmuz 2016 – 31 Aralık 2017, bütçe: 253.000 TL.
- · Santez projesi, 0291.STZ.2013-2 kodlu, “ATEŞKES” (Akustik algılayıcı ağların optimizasyonu ile ateşli silah konumunun tespit edilmesi (Determination of the location of firearms based on optimization of acoustic sensor networks), together with Havelsan Corp., Date of starting: 01.03.2014, 2 senelik, bütçe: 220.000 TL (~ 100.000 $).
- · METU-Technokent Consultancy: Intelligent Traffic System Design, Ortana Ltd., 2012 (two years).
- · TÜBİTAK, İnsansız Sualtı Araçları İçin Yol Planlama ve Sualtı Optik Görüntülerin Akustik Görüntüleme Desteği İle Iyileştirilmesi (Path Planning for Unmanned Underwater Vehicles and Improvement of Underwater Optic Image Quality Using Acoustical Imaging)", project supervisor, budget: 419 000 TL (~ 200.000 $), 2012 - 2015.
- · KOSGEB Arge ve İnnovasyon Programı, “Taşınabilir İnsansız Denizaltı Sistemlerinde opto-akustik Görüntü Sistemleri Uygulaması (Opto-Acoustic Imaging in Portable Unmanned Underwater Vehicles)”, (http://www.desistek.com.tr/en/) (together with Emre Ege), 2011.
- · Sanayi Bakanlığı Teknogirişim Sermayesi Desteği, “Orkinos: Taşınabilir insansız denizaltı sistemleri (Portable Unmanned Underwater Vehicles), (http://www.desistek.com.tr/en/)”, 97.500 TL (~ 50.000 $), (together with Emre Ege), 2011.
- · TÜBİTAK, “Çoklu İnsansız Hava Aracının (İha) Koordineli Güdümü ve Yol Planlama (Coordinated Guidance and Path Planning for Unmanned UAV’s)”, project supervisor, budget: 392 000 TL (~ 200.000 $), 2011 - 2014 (http://cokiha.metu.edu.tr/).
- · A consultant for “YEGAM” (A special company under Bahçeşehir University Educational Foundation), through ODTÜ – Teknokent company Yenel Ltd., 57.000TL + VAT (~ 35.000 $).
- · TÜBİTAK, “ULİSAR: Ulusal İnsansız Sualtı Aracı (National Unmanned Underwater Vehicle)”, project supervisor, budget: 350 000 TL (~ 200.000 $), 2006 - 2009.
- · TÜBİTAK-İltaren; Danışmanlık (consultant), “Uçan cisimlerin kontrolü (Control of flying objects)”, 2004.
- · TÜBİTAK-Bilten - TAİ; Danışmanlık (consultant), “Uçan cisimlerin parametrelerinin elde edilmesi (Determination of parameters of flying objects)”, 2003.
- · Aselsan, “Çoklu Hedefli Çoklu Kameralı Hedef İzleyici Algoritma Tasarım Projesi (Multi-target, multi-camera tracker algorithm design)”, araştırmacı (researcher), budget: approximately 70.000 $, 2005.
- · Research fund project (METU): “Bulanık Renkli Petri Devreleri ile Hata Teşhis ve Tesbiti (Fault detection and diagnosis using fuzzy Petri Nets)”.
Project No:
Supervisor: M.K. Leblebicioğlu
May 2000 - May 2001
- · Research fund project (METU): “Six Legged Walking Robot”.
Project No: BAP - 2002 - 03 - 01 - 06
Supervisor: M.K. Leblebicioğlu
June 2002 - June 2004
- · Research fund project (METU): “Robot Navigation by Genetic Programming”.
Project No: BAP - 2002 - 07 - 04 - 05
Supervisor: M.K. Leblebicioğlu
June 2002 - June 2004
- · Research fund project (METU): “Speeding up of evolutionary algorithms by a parabolic approximation and their use in the training of artificial neural networks”.
Project No: 98-06-04-01
Supervisor: M.K. Leblebicioğlu
May 1998-May 1999
- · TÜBİTAK project: ‘‘Image filtering and segmentation by multi-scale approaches’’.
Project No: 198E008
Supervisor: M.K. Leblebicioğlu
Sep. 1998 - Feb. 2000
- · TÜBİTAK complementary doctorate program: 5 Ph.D students are assigned to ‘‘Computer Vision and Neural Networks’’ research groub.
Group coordinator: Prof. Dr. Uğur Halıcı
Sep. 1996 - Sep. 2000
- · Research fund project (METU): “Anahtarlı Relüktans Motorlarında Moment Dalgalanmasının Minimize Edilmesi (Minimization of perturbations of moment in switched reluctance motors)”.
Project No: 94-03-01-05
Supervisor: M.K. Leblebicioğlu.
Sep. 1994-Sep. 1995
- · Research fund project (METU): ‘‘Development of 3-D computer graphics software for problems in EMT and control’’.
Project No: 89-03-01-06
Supervisors: M.K. Leblebicioğlu and G. Dural.
Sep. 1989-Sep.1991