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University of Colombo | Sri Lanka
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Personnel >> Academic Staff

Prof. D U J Sonnadara
Department of Physics
University of Colombo
Colombo 03
Sri Lanka
Telephone

+94 11 273 8022 (Home) +94 11 215 8367 (Office)
Fax +94 11 258 4777
Email upul@phys.cmb.ac.lk
Room 205
Extension 8367
Academic Qualifications  
  • Ph.D: University of Pittsburgh, USA, December 1992 (Nuclear Physics)
  • M.Sc: University of Pittsburgh, USA, April 1990 (Physics)
  • B.Sc: University of Colombo, Sri Lanka, December 1985 (1st Class in Physics)
Teaching Areas
  • Computational Physics
  • Instrumentation Physics
Fields of Specialization & Research Interests
  • Computational, Instrumentation and Atmospheric Physics. Presently concentrating on applied problems related to Computer Vision, Reconfigurable computing and Climate research.
Awards and grants
  • NSF commendation award for Fundamental Sciences (2009)
  • NSF commendation award for Physics (2003)
  • 2011-2014: An investigation of the lightning environment in Sri Lanka (NRC: 11-04)
  • 2007-2010: Exploring the monsoon climate and climate variability in Sri Lanka (NRC: 06-18)
  • 2007-2010: Computer Vision for monitoring and controlling vehicular traffic (NSF: RG/07/E/03)
  • 2004-2006: 3D reconstruction and shape analysis of electrical discharges (NSF: RG/04/E/06)
  • 2000-2002: Exploring the spatial and temporal variations of rainfall (NSF: RG/00/P/01)
  • 1999-2002: Implementation of an automated lightning detection network for Sri Lanka (NSF: RG/99/P/02) 
  • 1996-1999: Development of data acquisition and control systems for Personal Computers (NSF: RG/96/P/06)
Work Experience
  • April 2004 – Present: (Sri Lanka) Professor at the Department of Physics, University of Colombo
  • Nov 2002 - Nov 2003: (Sweden) Visiting Research Scientist at the Angstrom Laboratory, University of Uppsala
  • Nov 1995 – Present : (Sri Lanka) Senior Lecturer at the Department of Physics, University of Colombo
  • Jan 1993 – Nov 1995: (USA) Post-doctoral Research Associate at the Department of Physics, University of Pittsburgh
  • Sep 1987 – Dec 1992: (USA) Research Assistant at the Department of Physics, University of Pittsburgh
  • Jan 1986 – Jul 1987: (Sri Lanka) Assistant Lecturer at the Department of Physics, University of Colombo
Special Projects Undertaken
  • Consultant to several EMIS/IT related projects funded by the World Bank
  • Presently working as a core member of the implementation support team for the Education Sector Development Grant (ESDG) of the Ministry of Education
Grants Held
  • 2007-2010: Exploring the monsoon climate and climate variability in Sri Lanka (NRC: 06-18)
  • 2007-2010: Computer Vision for monitoring and controlling vehicular traffic (NSF: RG/07/E/03)
  • 2004-2006: 3D reconstruction and shape analysis of electrical discharges (NSF: RG/04/E/06) – NSF commendation award for Fundamental Sciences (2009)
  • 2000-2002: Exploring the spatial and temporal variations of rainfall (NSF: RG/00/P/01)
  • 1999-2002: Implementation of an automated lightning detection network for Sri Lanka (NSF: RG/99/P/02) – NSF commendation award for Physics (2003)
  • 1996-1999: Development of data acquisition and control systems for Personal Computers (NSF: RG/96/P/06)
Research Degrees Supervised
  • M.Phil. thesis, Characteristics of Cloud-to-Ground lightning flashes obtained with a wide band magnetic direction finding system, A.B. Weerasekera, Department of Physics, University of Colombo (2001)
  • Ph.D. thesis, Measurements and Analysis of Fast Transient EM Fields Generated by Ground and Cloud Flashes with Special Attention to Lightning Direction Finding, I.M.K. Fernando, Department of Physics, University of Colombo (2001)
  • M.Phil thesis, Exploring the spatial and temporal variations of rainfall in Sri Lanka, Perera H.K.W.I., Department of Physics, University of Colombo, Sri Lanka (2003)
  • Ph.D. thesis, Correlation between optical and current signatures of electrical discharges with special attention to remote sensing of lightning flashes, Liyanage J.P., Department of Physics, University of Colombo, Sri Lanka (2006)
  • M.Phil. Thesis, Channel Geometry and Modelling of Electrical Discharges, D.I. Amarasinghe, Department of Physics, University of Colombo, Sri Lanka (2007)
  • M.Phil Thesis, Numerical Computation in Configurable Hardware, W.A.S. Wijesinghe, Department of Physics, University of Colombo, Sri Lanka (2007)
  • M.Phil Thesis: Application of Computer Vision and Fuzzy Logic on Traffic Control, C.T. Wannige, Department of Physics, University of Colombo, Sri Lanka (2010)
  • M.Phil Thesis: Community Perception and Assessment of Transportation Noise, C.M. Kalansuriya, Department of Physics, University of Colombo, Sri Lanka (2010)
Journal Articles
  1. Energy Flow and Stopping in Relativistic Heavy Ion Collisions at Elab/A=14.6 GeV, E814 Collaboration, Phys. Rev. Lett. 64 (1990) 1219.
  2. Electromagnetic Dissociation of 28Si at Elab/A=14.6 GeV by Nucleon Emission, E814 Collaboration, Phys. Rev. C 41 (1990) 1512.
  3. Search for Strange Quark Matter in High Energy Heavy Ion Collisions, E814 Collaboration, Phys. Lett. B 252 (1990) 550.
  4. Forward Baryons in Relativistic Nucleus-Nucleus Collisions, E814 Collaboration, Phys. Rev. C 45 (1992) 819.   
  5. Electromagnetic Dissociation of Relativistic 28Si into p+27Al, E814 Collaboration, Phys. Rev. C 45 (1992) 2427.
  6. Charged Particle Multiplicity in 28Si+Al, Cu, Pb Reactions at Elab=14.6 GeV/nucleon, E814 Collaboration, Phys. Rev. C 46 (1992) 312.
  7. Anti-proton Production in Relativistic Si-Nucleus Collisions, E814 Collaboration, Phys. Rev. Lett. 70 (1993) 1763.
  8. Baryon Distributions in Ultra-Relativistic Nucleus-Nucleus Collisions, E814 Collaboration, Z. Phys. C 59 (1993) 211.
  9. Measurement of Transverse Energy Production with Si and Au Beams at Relativistic Energy: Towards Hot and Dense Hadronic Matter, E814/E877 Collaboration, Phys. Rev. Lett. 70 (1993) 2996.
  1. Two Charged Particle and Transverse Energy Correlations in Si+Pb Collisions at 14.6 A GeV/c, E814 Collaboration, Phys. Rev. C 49 (1994) 1669.
  2. Production of Light Nuclei in Relativistic Heavy Ion Collisions, E814 Collaboration, Phys. Rev. C 50 (1994) 1077.
  3. Evidence for Expansion of a Hot Fireball from Two-Pion Correlations for Si+Pb Collisions at AGS Energy, E814 Collaboration, Phys. Lett. B 333 (1994) 33.
  4. Centrality Dependence of Longitudinal and Transverse Baryon Distributions in Ultrarelativistic Nuclear Collisions, E814 Collaboration, Phys. Rev. C 50 (1994) 3047.
  5. Observation of Anisotropic Event Shapes and Transverse Flow in Au+Au  Collisions at AGS Energy, E877 Collaboration, Phys. Rev. Lett. 73 (1994) 2532.
  6. Liquid Ionisation Calorimetry with Time Sampled Signals, GEM Collaboration, Nucl. Inst. Meth. A 349 (1994) 367.
  7. Measurement of Pion Enhancement at Low Transverse Momentum and of the Delta resonance Abundance in Si-Nucleus Collisions at the AGS , E814 Collaboration, Phys. Lett. B 351 (1995) 93.
  8. Electromagnetic Dissociation of relativistic 28Si, E814 Collaboration, Phys. Rev. C 51 (1995) 865.
  9. Charged Particle Pseudorapidity Distributions in Au+Al, Cu, Au and U Collisions at 10.8 A GeV/c, E877 Collaboration, Phys. Rev. C 51 (1995) 3309.
  10. Production of Neutron-Rich Isotopes from the Fragmentation of 28Si Projectiles at Plab=14.6 GeV/c per Nucleon, E814 Collaboration, Phys. Rev. C 52 (1995) 956.
  11. Transverse Energy and Charged Particle Multiplicity in p-Nucleus Collisions at 14.6 GeV/c, E814 Collaboration, Phys. Rev. C 52 (1995) 2028.
  12. Search for Pion Neutron Bound States in 14.6 A GeV Si+Nucleus Collisions, E814 Collaboration, Phys. Rev. C 52 (1995) 2679.
  13. Backward Yields of Pions, Protons and Deuterons in Relativistic 28Si+Pb Collisions at 14.6 A GeV/c, E814 Collaboration, Nucl. Phys. A  622 (1997) 391.
  14. Energy and Charged Particle Flow in 10.8 A GeV/c Au+Au Collisions, E877 Collaboration, Phys. Rev. C 55 (1997) 1420.
  15. Two-Pion Correlations in Au+Au Collisions at 10.8 GeV/c per nucleon, E877 Collaboration, Phys. Rev. Lett. 78 (1997) 2916.
  16. Proton and Pion Production relative to the Reaction Plane in Au+Au Collisions at AGS Energies, E877 Collaboration, Phys. Rev. C 56 (1997) 3254.
  17. Study of the performance of direction finding stations prior to the implementation of a Lightning Location System in Sri Lanka, I.M.K. Fernando, D.U.J. Sonnadara, K.P.S.C. Jayaratne, T.R. Ariyaratne, S. Namasivayam & K.R.A Bandara, Ceylon Journal of Science, 5 (1998) 65-73.
  1. Directed Flow of Light Nuclei in Au + Au Collisions at AGS Energies, E877 Collaboration, Phys. Rev. C 59 (1999) 884
  2. Two Proton Correlations from 14.6/A GeV/c Si+Pb and 11.5/A GeV/c Au+Au Central Collisions, E814/E877 Collaboration, Phys. Rev. C 60 (1999) 054905
  3. Development of Client-Server based Network Centric Remote Data Acquisition Systems, C.T. Obadage, D.N. Ranasinghe, M.K. Jayananda and D.U.J. Sonnadara, Ceylon Journal of Science, 6 (1999) 29-37
  1. Light Fragment Yields from Au + Au Collisions at 11.5/A GeV/c, E814/E877 Collaboration, Phys. Rev. C 61  (2000) 044906
  2. Proton and Pion production in Au+Au collisions at 10.8A GeV/c, E877 Collaboration, Phys. Rev. C, 62  (2000) 024901
  3. Directed Flow of Anti-Protons in Au+Au Collisions at AGS, E877 Collaboration, Phys. Lett. B 485 (2000) 319-326
  4. Locating Cloud-to-Ground lighting flashes with simultaneous two station measurements, D.U.J. Sonnadara, A.B. Weerasekera, I.M.K. Fernando, R. Lelwala, K.P.S.C. Jayaratne, T.R. Ariyaratne, S. Namasivayam & K.R.A Bandara, Sri Lankan J. of Physics, 1 (2000) 11-22
  5. Online Trigger System to Detect Particles Generated in High Multiplicity Environments, D.U.J. Sonnadara, W.E. Cleland and S. Voloshin, J. of National Science Foundation, 28 (2000) 1-13
  6. Lambda Production and Flow in Au+Au Collisions at 11.5 A GeV/c, E877 Collaboration, Phys. Rev. C 63 (2001) 014902
  7. Activities of Cloud-to-Ground lightning in Monsoon Thunderstorms A.B. Weerasekera, D.U.J. Sonnadara, I.M.K. Fernando, J.P. Liyanage, R. Lelwala and T.R. Ariyaratne, Sri Lankan J. of Physics, 2 (2001) 21-30
  8. Measurements of lightning peak currents in the first return stroke of negative cloud-to-ground flashes, A.B. Weerasekera, D.U.J. Sonnadara, I.M.K. Fernando, J.P. Liyanage, R. Lelwala and T.R. Ariyaratne, Singapore J. of Physics, 17 (2001) 37-45
  9. Forecasting the occurrence of rainfall in selected weather stations in the wet and dry zones of Sri Lanka, H.K.W.I. Perera, D.U.J. Sonnadara and D.R. Jayewardene, Sri Lankan Journal of Physics, 3 (2002), 39-53
  10. Some Properties of lightning ground flashes observed in and around Sri Lanka and their seasonal variations, J.P. Liyanage, D.U.J. Sonnadara, I.M.K. Fernando, A.B. Weerasekara, R. Lelwala and T.R. Ariyaratne, Sri Lankan Journal of Physics, 3 (2002) 77-88
  1. Characteristics of chaotic pulse trains generated by lightning flashes, C. Gomes, V. Cooray, M. Fernando, M. Raul, U. Sonnadara, Journal of Atmospheric and Solar-Terrestrial Physics, 66 18 (2004) 1733-1743
  2. Spatial interpolation of weekly rainfall depth in the Dry zone of Sri Lanka, H.K.W.I. Jayawardene, D.U.J. Sonnadara and D.R. Jayewardene, Climate Research, 29 (2005) 223-231
  3. Trends of rainfall in Sri Lanka over the last century, H.K.W.I. Jayawardene, D.U.J. Sonnadara and D.R. Jayewardene, Sri Lankan J. of Physics, 6 (2005) 7-17
  4. The lightning radiation field spectra of cloud flashes in the interval 20kHz to 20MHz, U. Sonnadara, V. Cooray, and M. Fernando, IEEE Transactions on Electromagnetic Compatibility, 48 1 (2006) 234-239
  5. Characteristics of cloud to ground lightning flashes over Sweden, U. Sonnadara, V. Cooray and T. Gotschl, Physica Scripta, 74 (2006) 1-8
  6. Channel tortuosity of long laboratory sparks, D. Amarasinghe, U. Sonnadara, M. Berg, and V. Cooray, J. Electrostatics, 65 8 (2007) 521-526
  7. Correlation between brightness and channel currents of electrical discharges, D. Amarasinghe, U. Sonnadara, M. Berg, and V. Cooray, IEEE Transactions on Dielectrics and Electrical Insulations, 14 5 (2007) 115-1160
  8. Performance of artificial neural networks for forecasting daily occurrence and annual depth of rainfall at a tropical site, A.D. Kumarasiri and D.U.J. Sonnadara, Hydrological Processes, 22 17 (2008) 3535-3542
  9. Fractal characteristics of simulated electrical discharges, D.I. Amarasinghe and D.U.J. Sonnadara, J. of National Science Foundation, 36 2 (2008) 137-143
  10. Modelling free flowing vehicular traffic noise, R.T. Sooriaarachchi and D.U.J. Sonnadara, Engineer, 40 2 (2008) 43-37
  11. Performance evaluation of multipliers in reconfigurable hardware, W.A.S. Wijesinghe, M.K. Jayananda and D.U.J. Sonnadara, J. National Science Foundation, 36 3 (2008) 249-251
  12. Detecting and preventing plagiarism in online assessment, C.T. Wannige, D.U.J. Sonnadara, H.A. Usoof, K.P. Hewagamage, J. Science University of Kelaniya, 4 (2008) 95-104
  13. Predicting three-dimensional fractal dimensions of electrical discharges using two-dimensional projections, D. Amarasinghe and U. Sonnadara, J. Science, Eastern University of Sri Lanka, 6 (2009) 57-67
  14. Measurement of noise within passenger trains on a coastal railway line, N.S. Pahalavithana and D.U.J. Sonnadara, Sri Lankan J. Physics, accepted (2009)
  15. Performance of neural network in forecasting daily precipitation using multiple sources, H.D.P. Weerasinghe, H.L. Premaratne and D.U.J. Sonnadara, J. National Science Foundation, 38 3 (2010) 163-170
  16. Simulation of Diffusion Limited Aggregation in Field Programmable Gate Arrays, W.A.S. Wijesinghe, M.K. Jayananda and D.U.J. Sonnadara, J. National Science Foundation, 38 4 (2010) 213-218
  17. Performance of neural networks in forecasting short range occurrence of rainfall, V.S. Rathnayake, H.L. Premaratne and D.U.J. Sonnadara, J. National Science Foundation, 39 3 (2011) 251-260
  18. A Simple Reconfigurable Microprocessor in a 36 Macrocell CPLD, W.A.S. Wijesinghe, M.K. Jayananda and D.U.J. Sonnadara, J. National Science Foundation, 39 3 (2011) 261-266
Technical Reports
  1. Sri Lanka Poverty Assessment, Poverty Reduction and Economic Management Sector Unit, South Asia Region, World Bank, 22535-CE (2002)
  2. Treasures of the Education System in Sri Lanka: Restoring Performance, Expanding Opportunities and Enhancing Prospects, The World Bank Human Development Unit, South Asia Region, ISBN: 955-8908-14-2 (2005)
  3. Attaining the Millennium Development Goals in Sri Lanka: How likely and what will it take to reduce poverty, child mortality and malnutrition and to increase school enrollment and completion, The World Bank Human Development Unit, South Asia Region, ISBN: 955-8908-17-7 (2005)
  4. The towers of learning: Performance, peril and promise of higher education in Sri Lanka, The World Bank Human Development Unit, South Asia Region, ISBN: 978-955-8908-35-8 (2009)
  5. An Impact Evaluation of Sri Lanka’s Policies to Improve the Performance of Schools and Primary School Students through its School Improvement and School Report Card Programs, The World Bank Human Development Unit, South Asia Region, ISBN: 978-955-8908-40-2 (2011)
Conference Papers
  1. An Investigation of the Samples Produced by the Electrospray Technique in Molecular Desorption Mass Spectrometer, D.U.J. Sonnadara & T.R. Ariyaratne, SLAAS, Proc. 42nd Annual Session, Sri Lanka (1986).
  2. Studies of Proton Emission in Peripheral Collisions of Relativistic 28Si Ions, D.U.J. Sonnadara, American Physical Society, Washington DC (1991).
  3. Excitation Energy Distributions in the Electromagnetic Dissociation of 28Si into 1n+27Si, D.U.J. Sonnadara, American Physical Society, Washington DC (1992).
  4. Electromagnetic dissociation of Relativistic Si via the Giant Dipole Resonance, D.U.J. Sonnadara, Gull Lake Nuclear Physics Conference,  Nucl. Phys. A 569 (1994) 149c.
  5. Use of BBC Micro Computers in Physics, B.M.A. Rodrigo & D.U.J. Sonnadara, IPSL, Proc. 13th Technical Session, Sri Lanka (1997).
  6. An Investigation of Digital Filtering Techniques, L.M.T.D. Fernando, D.U.J. Sonnadara & D.N. Ranasinghe, IPSL, Proc. 13th Technical Session, Sri Lanka (1997).
  7. A Computerised Temperature Control System, W.A.T. Weerasinghe & D.U.J. Sonnadara, IPSL, Proc. 13th Technical Session, Sri Lanka (1997).
  8. An Electronic Surveillance System for Night-flying Birds, C.M. Edirisinghe, D.U.J. Sonnadara & V. Yapa, IPSL, Proc. 14th Technical Session, Sri Lanka (1998).
  9. Low Cost Data Acquisition and Control Systems for Personal Computers, M.K. Jayananda & D.U.J. Sonnadara, IPSL, Proc. 14th Technical Session, Sri Lanka (1998).
  10. Virtual Instrumentation: A Way to Build Low Cost Laboratory Equipment, H.T.M.M. Fernando & D.U.J. Sonnadara, CSSL, Proc. 17th National IT Conference (1998).
  11. Speech Recognition: Application to the Sinhala Language, M.P. Warusawithana & D.U.J. Sonnadara, CSSL, Proc. 17th National IT Conference (1998).
  12. PC Based Data Collection and Process Control Systems for Research and Industry Applications, M.K. Jayananda & D.U.J. Sonnadara, SLAAS, Proc. 54th Annual Session, Sri Lanka (1998).
  13. Building Low Cost Virtual Instruments for Physics Research, H.T.M.M. Fernando & D.U.J. Sonnadara, SLAAS, Proc. 54th Annual Session, Sri Lanka (1998).
  14. Human Voice and Speech: Creating a Simple Speech Recogniser for the Sinhala Language, M.P. Warusawithana, D.U.J. Sonnadara, M.K. Jayananda and A. Nanayakkara, SLAAS, Proc. 54th Annual Session, Sri Lanka (1998).
  15. The Effect of Field Leakage on the Kinetic Energy Measurements of Ions emitted in a Plasma Desorption Mass Spectrometry, M.M.G.S. Fernando & D.U.J. Sonnadara, SLAAS, Proc. 54th Annual Session, Sri Lanka (1998).
  16. Comparison of FFT and Maximum Entropy Method in Sinhala Speech Recognition, A. Nanayakkara, M.K. Jayananda and D.U.J. Sonnadara, SLAAS, Proc. 54th Annual Session, Sri Lanka (1998).
  17. Preliminary results of implementing an automated system in Sri Lanka to locate lighting ground flashes, I.M.K. Fernando, D.U.J. Sonnadara, K.P.S.C. Jayaratne, S. Namasivayam and T.R. Ariyaratne, SLAAS, Proc. 54th Annual Session, Sri Lanka (1998).
  18. Parallel port based data acquisition system for IBM or compatible personal computers, A.R. Dedigama and D.U.J. Sonnadara, IPSL, Proc. 15th Technical Session, Sri Lanka (1999).
  19. The role of site selection on localising ground flashes in an automated lighting detection network, D.U.J. Sonnadara, I.M.K. Fernando, S. Namasivayam, T.R. Ariyaratne, K.P.S.C. Jayaratne and K.R.A. Bandara, IPSL, Proc. 15th Technical Session, Sri Lanka (1999).
  20. Some features of lightning ground flash activities observed in tropical thunderstorms, A.B. Weerasekara, I.M.K. Fernando, D.U.J. Sonnadara, R. Lelwala, K.P.S.C. Jayaratne, S. Namasivayam, K.R.A. Bandara, C. Gomes, T.R. Ariyaratna, SLAAS, Proc. 55th Annual Session, Sri Lanka (1999).
  21. On the accuracy of locating lightning ground flashes using two or more direction finding stations, D.U.J. Sonnadara, I.M.K. Fernando, S. Namasivayam, K.P.S.C. Jayaratne, K.R.A. Bandara, R. Lelwala, A.B. Weerasekera, C. Gomes, T.R. Ariyaratne, SLAAS, Proc. 55th Annual Session, Sri Lanka (1999).
  22. A study of LLP systems and their performance in locating ground flashes in Sri Lanka  (1998-1999), D.U.J. Sonnadara for LLP group, IPSL, Proc. 16th Technical Session, Sri Lanka (2000)
  23. Preliminary results of short term and long term rainfall forecasting, W. Perera and D.U.J. Sonnadara, IPSL, Proc. 16th Technical Session, Sri Lanka (2000)
  24. Measurements of lightning peak currents in the first return stroke of negative cloud to ground flashes, A.B. Weerasekera, J.P. Liyanage, D.U.J. Sonnadara and I.M.K. Fernando, SLAAS, Proc. 56th Annual Session, Sri Lanka (2000).
  25. A comparison between some characteristics between positive and negative cloud to ground flashes observed in Sri Lanka and their seasonal variations, J.P. Liyanage, A.B. Weerasekera, D.U.J. Sonnadara and I.M.K. Fernando, SLAAS, Proc. 56th Annual Session, Sri Lanka (2000).
  26. Preliminary results of Markov model approach in forecasting wet/dry condition over short periods, H.K.W.I. Perera, D.U.J. Sonnadara and D.R. Jayewardene, SLAAS, Proc. 56th Annual Session, Sri Lanka (2000).
  1. Measurements of lightning flash activities over Sri Lanka, A.B. Weerasekera, J.P. Liyanage, I.M.K. Fernando, D.U.J. Sonnadara and T.R. Ariyaratne, Proc. Annual Sessions - 2000, Faculty of Science, University of Colombo, (2000).
  2. Simulation study of the effect of random and systematic errors in magnetic direction finding stations, J.P. Liyanage, A.B. Weerasekera, D.U.J. Sonnadara and I.M.K. Fernando, Proc. Annual Sessions - 2000, Faculty of Science, University of Colombo, (2000).
  3. Performance comparison between the magnetic direction finding technique and time-of-arrival technique, D.U.J. Sonnadara, C.M. Edirisinghe and I.M.K. Fernando, IPSL, Proc. 17th Technical Session, Sri Lanka ( 2001).
  4. Construction of a high speed buffer amplifier to measure lightning generated vertical electric fields, C.M. Edirisinghe, I.M.K. Fernando and D.U.J. Sonnadara, IPSL, Proc. 17th Technical Session, Sri Lanka (2001).
  5. Development of fuzzy logic based traffic control systems, W.S. Fernando and D.U.J. Sonnadara, SLAAS, Proc. 57th Annual Session, Sri Lanka (2001).
  6. Development of low cost network based virtual instruments, P. Goonatillake and D.U.J. Sonnadara, SLAAS, Proc. 57th Annual Session, Sri Lanka (2001).
  7. Some characteristics of cloud to ground lightning obtained with lightning direction finding systems in Sri Lanka, I.M.K. Fernando, A.B. Weerasekera, J.P. Liyanage and D.U.J. Sonnadara, SLAAS, Proc. 57th Annual Session, Sri Lanka (2001).
  8. A simulation study on the correction of the systematic errors in a network of magnetic direction finding network, J.P. Liyanage, D.U.J. Sonnadara and I.M.K. Fernando, SLAAS, Proc. 57th Annual Session, Sri Lanka (2001).
  9. A low cost device protector for telephone-interfaced equipment, P. Goonatillake and D.U.J. Sonnadara, SLAAS, Proc. 57th Annual Session, Sri Lanka (2001).
  10. Performance of parallel port based remote data acquisition systems in real-time data processing, P.C.C.P.W. Goonetilleke and D.U.J. Sonnadara, IPSL, Proc. 18th Technical Session, Sri Lanka (2002)
  11. Performance of adaptive-fuzzy technique in controlling vehicular traffic, W.S. Fernando and D.U.J. Sonnadara, IPSL, Proc. 18th Technical Session, Sri Lanka (2002)
  12. Effect of distance on the measurement of multiplicity and peak currents of lightning direction finding systems, J.P. Liyanage, C.M. Edirisinghe, D.U.J. Sonnadara and I.M.K. Fernando, SLAAS, Proc. 58th   Annual Session, Sri Lanka (2002)
  13. Development of microcontroller based high capacity standalone data acquisition systems, W.S.P. Fernando, P.C.C.P.W Goonetilleke, I.M.K. Fernando and D.U.J. Sonnadara, SLAAS, Proc. 58th   Annual Session, Sri Lanka (2002)
  14. Microcontroller embedded web server with flash support, P.C.C.P.W. Goonetilleke, W.S.P. Fernando, I.M.K. Fernando and D.U.J. Sonnadara, SLAAS, Proc. 58th   Annual Session, Sri Lanka (2002)
  15. Using time and frequency domain information for the development of adoptive voice control devices, E.P.N.S. Edirisinghe and D.U.J. Sonnadara, IPSL, Proc. 20th Technical Session, Sri Lanka (2004)1-5.
  16. Virtual robot arm control model, N. Kottege and D.U.J. Sonnadara, IPSL, Proc. 20th Technical Session, Sri Lanka (2004) 6-13.
  17. Performance characteristics of LLP lightning locating systems, U. Sonnadara, V. Cooray and R. Montano, Faculty of Science Annual Sessions, Sri Lanka (June 2004)
  18. Lightning radiation field spectra of cloud flashes, U. Sonnadara, V. Cooray and M. Fernando, ICLP, France (September 2004)
  19. Text to speech conversion: Tamil language, N. Philips, D.U.J. Sonnadara and M.K. Jayananda, IPSL, Proc. 21st Technical Session, Sri Lanka (March 2005)
  20. CPLD Based Simple Microprocessor for Data Acquisition, W.A.S. Wijesinghe, M.K. Jayananda and D.U.J. Sonnadara, IPSL, Proc. 21st Technical Session, Sri Lanka (March 2005)
  21. Analysis of tortuosity of long laboratory sparks, D.I. Amarasinghe and D.U.J. Sonnadara, SLAAS, Proc. 61st Annual Session, Sri Lanka, E1-507 (December 2005)
  22. Optical signatures of electrical breakdown trajectories in air, D.I. Amarasinghe and D.U.J. Sonnadara, SLAAS, Proc. 61st Annual Session, Sri Lanka, E1-508 (December 2005)
  23. Rainfall forecasting: An artificial neural network approach, A.D. Kumarasiri and D.U.J. Sonnadara, IPSL, Proc. 22nd Technical Session, Sri Lanka (March 2006)
  24. Development of a road traffic noise prediction model, R.T. Sooriyaarachchi and D.U.J. Sonnadara, IPSL, Proc. 22nd Technical Session, Sri Lanka (March 2006)
  25. Hardware implementation of random number generators, W.A.S. Wijesinghe, M.K. Jayananda and D.U.J. Sonnadara, IPSL, Proc. 22nd Technical Session, Sri Lanka (March 2006)
  26. Fractal properties of long sparks, D.I. Amarasinghe and D.U.J. Sonnadara, SLAAS, Proc. 62nd Annual Session, Sri Lanka (2006)
  27. Stochastic modelling of dielectric breakdown, D.I. Amarasinghe and D.U.J. Sonnadara, SLAAS, Proc. 62nd Annual Session, Sri Lanka (2006)
  1. Study of multipliers in programmable logic devices, W.A.S. Wijesinghe, M.K. Jayananda, D.U.J. Sonnadara, SLAAS, Proc. 62nd Annual Session, Sri Lanka (2006)
  2. Detection of license plates of vehicles, I. Wanniarachchi, D.U.J. Sonnadara and M.K. Jayananda, IPSL, Proc. 23rd Technical Session, Sri Lanka (March 2007)
  3. 3D modelling of electrical discharges, D.I. Amarasinghe and D.U.J. Sonnadara, IPSL, Proc. 23rd Technical Session, Sri Lanka (March 2007)
  4. Modelling wind speed distributions in selected weather stations, W.P.L. Fernando and D.U.J. Sonnadara, IPSL, Proc. 23rd Technical Session, Sri Lanka (March 2007)
  5. License plate localization based on image processing, W.K.I.L. Wanniarachchi, D.U.J. Sonnadara and M.K. Jayananda, IEEE, 2nd Int. Conf. on Industrial and Information Systems, Sri Lanka (September 2007)
  6. An approach to online e-assessment for distance learning, C.T. Wannige, D.U.J. Sonnadara, H.A. Usoof, K.P. Hewagamage, CSSL, Proc. 25th National IT Conference (September 2007)
  7. Comparison of projection and wavelet based techniques in recognition of Sinhala handwritten scripts, N.P.T.I. Nilaweera, H.L. Premeratne, D.U.J. Sonnadara, CSSL, Proc. 25th National IT Conference (September 2007)
  8. Vehicle identification and tracking using image sequences, L.G.C Wimalaratna, D.U.J. Sonnadara, CSSL, Proc. 25th National IT Conference (September 2007)
  9. A neural network based rainfall forecasting system using multiple stations, H.D.P Weerasinghe, H.L. Premaratne and D.U.J. Sonnadara, CSSL, Proc. 25th National IT Conference (September 2007)
  10. Measurement and evaluation of road traffic noise levels, C.M. Kalansuriya, D.U.J. Sonnadara and A.S. Pannila, SLAAS, Proc. 63rd Annual Session, Sri Lanka (December 2007)
  11. Estimation of the speeds of moving vehicles from video sequences, L.G.C. Wimalaratne and D.U.J. Sonnadara, IPSL, Proc. 24th Technical Session, Sri Lanka (March 2008)
  12. Detection and extraction of road traffic signs, W.K.I.L. Wanniarachchi, D.U.J. Sonnadara and M.K. Jayananda, IPSL, Proc. 24th Technical Session, Sri Lanka (March 2008)
  13. Vehicle counting and classification from a traffic scene, M. Pancharatnam and D.U.J. Sonnadara, CSSL, Proc. 26th National IT Conference (August 2008)
  14. Predicting roadway noise based on traffic composition, C.M. Kalansuriya, A.S. Pannila and D.U.J. Sonnadara, Faculty of Science Annual Sessions, Sri Lanka (October 2008)
  15. Dense packing of hard particles: A review, D.I. Amarasinghe and D.U.J. Sonnadara, Faculty of Science Annual Sessions, Sri Lanka (October 2008)
  16. Recognition of handwritten Sinhala characters and words using neural networks, N.P.T.I. Nilaweera, H.L. Premeratne, D.U.J. Sonnadara, Faculty of Science Annual Sessions, Sri Lanka (October 2008)
  17. Simulation of Self Similar Random Trees, K.D.S. Jinasena and D.U.J. Sonnadara, 9th International Information Technology Conference (October 2008)
  18. Forecasting Droughts Using Artificial Neural Networks, G. Illeperuma and U. Sonnadara, National Symposium on Promoting Knowledge Transfer to Strengthen Disaster Risk Reduction & Climate Change Adaptation (November 2008)
  19. Community response to road traffic noise, C.M. Kalansuriya, D.U.J. Sonnadara and A.S. Pannila, SLAAS, Proc. 64th Annual Session, Sri Lanka (December 2008)
  20. Traffic signal control based on adaptive neuro-fuzzy inference, T. Wannige and D.U.J. Sonnadara, IEEE, 4th International Conference on Information and Automation for Sustainability (December 2008)
  21. Effect of roadside vegetation on the reduction of traffic noise levels, C.M. Kalansuriya, A.S. Pannila, D.U.J Sonnadara, IPSL, Proc. 25th Technical Session, Sri Lanka (March 2009)
  22. Climate change in the hill country of Sri Lanka, J. De Silva and D.U.J. Sonnadara, IPSL, Proc. 25th Technical Session, Sri Lanka (March 2009)
  23. Simulation of Lightning Discharges: Influence of ground objects and positive leaders, M.D.N. Perera and D.U.J. Sonnadara, IPSL, Proc. 25th Technical Session, Sri Lanka (March 2009)
  24. Surface colour variation of Papaya fruits with maturity, D. Amarasinghe and D.U.J. Sonnadara, IPSL, Proc. 25th Technical Session, Sri Lanka (March 2009)
  25. Forecasting Droughts Using Artificial Neural Networks, G. Illeperuma and U. Sonnadara, National Symposium on Promoting Knowledge Transfer to Strengthen Disaster Risk Reduction & Climate Change Adaptation (July 2009)
  26. Fuzzy Signal Light Control for Pedestrian Crossings, T. Wannige and D.U.J. Sonnadara, CSSL, Proc. 27th National IT Conference (September 2009)
  27. Adoptive Neuro-Fuzzy Traffic Signal Control System for Multiple Junctions, T. Wannige and D.U.J. Sonnadara, IEEE, 4th Int. Conf. on Industrial and Information Systems, Sri Lanka (December 2009)
  28. Measurement of noise levels at the vicinity of hospitals, C. Kalansuriya, D.U.J. Sonnadara, A.S. Pannila, SLAAS, 65th Annual Session (December 2009)
  29. Night-time detection of vehicles, P.D.V.L.S. Perera and D.U.J. Sonnadara, IPSL, Proc. 26th Technical Session, Sri Lanka (March 2010)
  30. Analysis of wet and dry behaviour of weather through Markov models, P.M. Piyadasa and D.U.J. Sonnadara, IPSL, Proc. 26th Technical Session, Sri Lanka (March 2010)
  31. Pedestrian detection through monocular vision, C.T. Wannige and D.U.J. Sonnadara, IPSL, Proc. 26th Technical Session, Sri Lanka (March 2010)
  32. Detection and classification of traffic signs from video sequences, P.M. Gunawardana and D.U.J. Sonnadara, Faculty of Science Annual Sessions, Sri Lanka (May 2010)
  33. Development of maximum power point tracking system for Solar lighting applications, T.C. Peris, D.U.J. Sonnadara and T.R. Ariyaratne, Faculty of Science Annual Sessions, Sri Lanka (May 2010)
  34. Spectral characteristics of noise attenuation by vegetation belts, C.M. Kalansuriya, A.S. Pannila and D.U.J. Sonnadara, Faculty of Science Annual Sessions, Sri Lanka (May 2010)
  35. Using Optical Flow to Avoid Obstacles in Robot Navigation, G.D. Illeperuma and D.U.J. Sonnadara, CSSL, Proc. 28th National IT Conference (August 2010)
  36. Development of Feature Based Artificial Neural Network Model for Weather Nowcasting, Vajira Sampath, H.L. Premaratne and D.U.J. Sonnadara, 2nd National Symposium on Disaster Risk Reduction & Climate Change Adaptation (August 2010)
  37. Analysis of Lightning activities over Sri Lanka using Satellite data, M. Perera and D.U.J. Sonnadara, SLAAS, 66th Annual Session (December 2010)
  38. Evidence of self organized criticality in rainfall, H.M. Wijesekera and D.U.J. Sonnadara, SLAAS, 66th Annual Session (December 2010)
  39. Extracting traffic parameters at intersections through computer vision, K.D. Peiris and D.U.J. Sonnadara, IPSL, Proc. 27th Technical Session, Sri Lanka (March 2011)
  40. Colour segmentation for screen printing, R.U. Hewage and D.U.J. Sonnadara, IPSL, Proc. 27th Technical Session, Sri Lanka (March 2011)
  41. Classification of coir fibres using machine vision, M.W.T. Chamara and D.U.J. Sonnadara, IPSL, Proc. 27th Technical Session, Sri Lanka (March 2011)
  42. Development of an automated weather station with remote data transmission capability, R. Weerasinghe, M.S.M. Aroos, A.S. Pannila, M.K. Jayananda and D.U.J. Sonnadara, Annual Research Symposium, University of Colombo (June 2011)
  43. Simulating branching geometries in random trees, K.D.S. Jinasena and D.U.J. Sonnadara, Annual Research Symposium, University of Colombo (June 2011)
  44. Object tracking using optical flow, G.I. Illeperuma and D.U.J. Sonnadara, Annual Research Symposium, University of Colombo (June 2011)
  45. An autonomous robot navigation system based on optical flow, G.D. Illeperuma and D.U.J. Sonnadara, IEEE, 6th Int. Conf. on Industrial and Information Systems, Sri Lanka (August 2011)

 
 
 

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