• Ph.D: University of Pittsburgh, USA, December 1992 (Specialization: Relativistic Heavy Ion Physics)

• M.Sc: University of Pittsburgh, USA, April 1990

• B.Sc: University of Colombo, Sri Lanka, December 1985 (Special Degree in Physics: First Class Honours)

• Field of Specialization: High Energy Physics (Experimental)
• Research Interests: Instrumentation, Atmospheric and Computational Physics. Presently concentrating on applied problems related to Computer Vision, Reconfigurable computing and Climate research.

• 1997 - present: Sri Lanka Association for the Advancement of Science
  • 2000: General Secretary, 2001: President, Section E1
• 1997 - present: Institute of Physics, Sri Lanka
  • 2007 March to date: President
  • 1998-2000: Secretary, 2001-2002: Vice President, 2007 - to date President

• 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

• Consultant to several EMIS/IT related projects supported by the World Bank (WB).
• Presently working as a core member of the implementation support team of the WB for the Education Sector Development Grant (ESDG) of the Ministry of Education and Higher Education.

• Director of Studies of the Faculty of Science, University of Colombo
• Coordinator of the M.Sc. in Applied Electronics
• Supervisor for the London A/L practical examinations (Physics)
• Served as the Project Coordinator of the special degree research projects
• Served as the Faculty representative of the University Network Steering Committee
• Served as the Faculty representative of the University of Colombo Senate
• Served as a member of the Faculty of Science IT committee
• Served as a member of the Faculty of Science computer center committee (ITU)
• Served as an ICT coordinator/Supervisor for the Bachelor of Information Technology (BIT) examinations
• Served as a member of the Computer Advisory Committee of the Ministry of Education and Higher Education
• Served as a member of the National Curriculum Consultative Committee at the National Institute of Education
• Served as a member of the ‘Science and Technology’ panel of the ‘Vibhasha’ Translation Studies Program conducted by the Center for Policy Alternatives

• 2007-2009: Computer Vision for monitoring and controlling vehicular traffic (NSF: RG/07/E/03)
• 2004-2006: 3D reconstruction and shape analysis of electrical discharges through image processing (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) – Awarded a special commendation (2003)
• 1996-1999: Development of data acquisition and control systems for Personal Computers (NSF: RG/96/P/06)

• 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)

Publications in refereed journals:

1. E814 Collaboration, Energy Flow and Stopping in Relativistic Heavy Ion Collisions at Elab/A=14.6 GeV, Phys. Rev. Lett. 64 (1990) 1219.
2. E814 Collaboration, Electromagnetic Dissociation of 28Si at Elab/A=14.6 GeV by Nucleon Emission, Phys. Rev. C 41 (1990) 1512.
3. E814 Collaboration, Search for Strange Quark Matter in High Energy Heavy Ion Collisions, Phys. Lett. B 252 (1990) 55
4. E814 Collaboration, Forward Baryons in Relativistic Nucleus-Nucleus Collisions, Phys. Rev. C 45 (1992) 819.
5. E814 Collaboration, Electromagnetic Dissociation of Relativistic 28Si into p+27Al, Phys. Rev. C 45 (1992) 2427.
6. E814 Collaboration, Charged Particle Multiplicity in 28Si+Al, Cu, Pb Reactions at Elab=14.6 GeV/nucleon, Phys. Rev. C 46 (1992) 312.
7. Upul J. Sonnadara, Electromagnetic Dissociation of Relativistic Si-28 by Nucleon Emission, Ph.D. Thesis, UMI-93-17963-mc (1993) 115p
8. E814 Collaboration, Anti-proton Production in Relativistic Si-Nucleus Collisions, Phys. Rev. Lett. 70 (1993) 1763.
9. E814 Collaboration, Baryon Distributions in Ultra-Relativistic Nucleus-Nucleus Collisions, Z. Phys. C 59 (1993) 211.
10. E814/E877 Collaboration, Measurement of Transverse Energy Production with Si and Au Beams at Relativistic Energy: Towards Hot and Dense Hadronic Matter, Phys. Rev. Lett. 70 (1993) 2996.
11. E814 Collaboration, Two Charged Particle and Transverse Energy Correlations in Si+Pb Collisions at 14.6 A GeV/c , Phys. Rev. C 49 (1994) 1669.
12. E814 Collaboration, Production of Light Nuclei in Relativistic Heavy Ion Collisions, Phys. Rev. C 50 (1994) 1077.
13. 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.
14. E814 Collaboration, Centrality Dependence of Longitudinal and Transverse Baryon Distributions in Ultrarelativistic Nuclear Collisions, Phys. Rev. C 50 (1994) 3047.
15. E877 Collaboration, Observation of Anisotropic Event Shapes and Transverse Flow in Au+Au Collisions at AGS Energy, Phys. Rev. Lett. 73 (1994) 2532.
16. GEM Collaboration, Liquid Ionisation Calorimetry with Time Sampled Signals, Nucl. Inst. Meth. A 349 (1994) 367.
17. E814 Collaboration, Measurement of Pion Enhancement at Low Transverse Momentum and of the Delta resonance Abundance in Si-Nucleus Collisions at the AGS , Phys. Lett. B 351 (1995) 93.
18. E814 Collaboration, Electromagnetic Dissociation of relativistic 28Si, Phys. Rev. C 51 (1995) 865.
19. E877 Collaboration, Charged Particle Pseudorapidity Distributions in Au+Al, Cu, Au and U Collisions at 10.8 A GeV/c, Phys. Rev. C 51 (1995) 3309.
20. E814 Collaboration, Production of Neutron-Rich Isotopes from the Fragmentation of 28Si Projectiles at Plab=14.6 GeV/c per Nucleon, Phys. Rev. C 52 (1995) 956.
21. E814 Collaboration, Transverse Energy and Charged Particle Multiplicity in p-Nucleus Collisions at 14.6 GeV/c, Phys. Rev. C 52 (1995) 2028.
22. E814 Collaboration, Search for Pion Neutron Bound States in 14.6 A GeV Si+Nucleus Collisions, Phys. Rev. C 52 (1995) 2679.
23. E814 Collaboration, Backward Yields of Pions, Protons and Deuterons in Relativistic 28Si+Pb Collisions at 14.6 A GeV/c, Nucl. Phys. A 622 (1997) 391.
24. E877 Collaboration, Energy and Charged Particle Flow in 10.8 A GeV/c Au+Au Collisions, Phys. Rev. C 55 (1997) 1420.
25. E877 Collaboration, Two-Pion Correlations in Au+Au Collisions at 10.8 GeV/c per nucleon, Phys. Rev. Lett. 78 (1997) 2916.
26. E877 Collaboration, Proton and Pion Production relative to the Reaction Plane in Au+Au Collisions at AGS Energies, Phys. Rev. C 56 (1997) 3254.
27. I.M.K. Fernando, D.U.J. Sonnadara, K.P.S.C. Jayaratne, T.R. Ariyaratne, S. Namasivayam & K.R.A Bandara, Study of the performance of direction finding stations prior to the implementation of a Lightning Location System in Sri Lanka, Ceylon Journal of Science, 4 (1998) 77.
28. E877 Collaboration, Particle Production and Hydrodynamic Flow: Recent Results from E877 for Au + Au Collisions at AGS Energy, Nucl. Phys. A 638 (1998) 69.
29. E877 Collaboration, Directed Flow of Light Nuclei in Au + Au Collisions at AGS Energies, Phys. Rev. C 59 (1999) 884
30. E814/E877 Collaboration, Two Proton Correlations from 14.6/A GeV/c Si+Pb and 11.5/A GeV/c Au+Au Central Collisions, Phys. Rev. C 60 (1999) 054905
31. C.T. Obadage, D.N. Ranasinghe, M.K. Jayananda and D.U.J. Sonnadara, Development of Client-Server based Network Centric Remote Data Acquisition Systems, Ceylon Journal of Science, 6 (1999) 29-37
32. E814/E877 Collaboration, Light Fragment Yields from Au + Au Collisions at 11.5/A GeV/c, Phys. Rev. C 61 (2000) 044906
33. E877 Collaboration, Proton and Pion production in Au+Au collisions at 10.8A GeV/c, Phys. Rev. C, 62 (2000) 024901
34. E877 Collaboration, Directed Flow of Anti-Protons in Au+Au Collisions at AGS, Phys. Lett. B 485 (2000)
    319-326
35. 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, Locating Cloud-to-Ground lighting flashes with simultaneous two station measurements, Sri Lankan J. of Phys., 1 (2000) 11-22
36. D.U.J. Sonnadara, W.E. Cleland and S. Voloshin, Online Trigger System to Detect Particles Generated in High Multiplicity Environments, J. of National Science Foundation, 28 (2000) 1-13
37. E877 Collaboration, Lambda Production and Flow in Au+Au Collisions at 11.5 A GeV/c, Phys. Rev. C 63 (2001) 014902
38. A.B. Weerasekera, D.U.J. Sonnadara, I.M.K. Fernando, J.P. Liyanage, R. Lelwala and T.R. Ariyaratne, Activity of Cloud-to-Ground lightning observed in Sri Lanka and in the surrounding area of the Indian Ocean, Sri Lankan J. of Physics, 2 (2001) 21-30
39. A.B. Weerasekera, D.U.J. Sonnadara, I.M.K. Fernando, J.P. Liyanage, R. Lelwala and T.R. Ariyaratne, Measurements of lightning peak currents in the first return stroke of negative cloud-to-ground flashes, Singapore J. of Physics, 17 (2001)
40. H.K.W.I. Perera, D.U.J. Sonnadara and D.R. Jayewardene, Forecasting the occurrence of rainfall in selected weather stations in the wet and dry zones of Sri Lanka, Sri Lankan J. of Physics, 3 (2002) 39-53
41. J. P. Liyanage, D. U. J. Sonnadara, I. M. K. Fernando, A. B. Weerasekera, R. Lelwala, T. R. Ariyaratne, Some Properties of Lightning Ground Flashes Observed in and around Sri Lanka, and their Seasonal Variations, Sri Lankan J. of Physics, 3 (2002) 77-88
42. H.K.W.I. Perera, D.U.J. Sonnadara and D.R. Jayewardene, Forecasting the occurrence of rainfall in selected weather stations in the wet and dry zones of Sri Lanka, Sri Lankan J. of Physics, 3 (2002) 39-53
43. J. P. Liyanage, D. U. J. Sonnadara, I. M. K. Fernando, A. B. Weerasekera, R. Lelwala, T. R. Ariyaratne, Some Properties of Lightning Ground Flashes Observed in and around Sri Lanka, and their Seasonal Variations, Sri Lankan J. of Physics, 3 (2002) 77-88
44. C. Gomes, V. Cooray, M. Fernando, M. Raul, U. Sonnadara, Characteristics of chaotic pulse trains generated by lightning flashes, J. Atmospheric and Solar-Terrestrial Physics, 66 (2004) 1733
45. H.K.W.I. Jayawardene, D.U.J. Sonnadara and D. R. Jayewardene, Spatial interpolation of weekly rainfall depth in the Dry zone of Sri Lanka, Climate Research, 29 (2005) 223-231
46. H.K.W.I Jayawardene, D.U.J. Sonnadara and D.R. Jayewardene, Trends of Rainfall in Sri Lanka over the last century, Sri Lankan J. of Physics, 6 (2005) 7-17
47. U. Sonnadara, V. Cooray, and M. Fernando, The lightning radiation field spectra of cloud flashes in the interval 20kHz to 20MHz, IEEE Transactions on Electromagnetic Compatibility, 48, 1 (2006) 234-239
48. U. Sonnadara, V. Cooray and T. Gotschl, Lightning flash activities over Sweden, Physica Scripta, 74 (2006) 541-548
49. Channel tortuosity of long laboratory sparks, D. Amarasinghe, U.
    Sonnadara, M. Berg, and V. Cooray, J. Electrostatics, 65, 8 (2007) 521-526.
50. 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) 1154-1160.
51. 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, in print (2007)
52. Fractal characteristics of simulated electrical discharges, D.I.
    Amarasinghe and D.U.J. Sonnadara, J. of National Science Foundation, accepted
    (2007)

Conference Presentations:

1. D.U.J. Sonnadara & T.R. Ariyaratne, An Investigation of the Samples Produced by the Electrospray Technique in Molecular Desorption Mass Spectrometer, SLAAS, Proc. 42nd Annual Session, Sri Lanka (1986).
2. D.U.J. Sonnadara, Studies of Proton Emission in Peripheral Collisions of Relativistic 28Si Ions, American Physical Society, Washington DC (1991).
3. D.U.J. Sonnadara, Excitation Energy Distributions in the Electromagnetic Dissociation of 28Si into 1n+27Si, American Physical Society, Washington DC (1992).
4. D.U.J. Sonnadara, Electromagnetic dissociation of Relativistic Si via the Giant Dipole Resonance, Gull Lake Nuclear Physics Conference, Nucl. Phys. A 569 (1994) 149c.
5. B.M.A. Rodrigo & D.U.J. Sonnadara, Use of BBC Micro Computers in Physics, IPSL, Proc. 13th Technical Session, Sri Lanka (1997).
6. L.M.T.D. Fernando, D.U.J. Sonnadara & D.N. Ranasinghe, An Investigation of Digital Filtering Techniques, IPSL, Proc. 13th Technical Session, Sri Lanka (1997).
7. W.A.T. Weerasinghe & D.U.J. Sonnadara, A Computerized Temperature Control System, IPSL, Proc. 13th Technical Session, Sri Lanka (1997).
8. C.M. Edirisinghe, D.U.J. Sonnadara & V. Yapa, An Electronic Surveillance System for Night-flying Birds, IPSL, Proc. 14th Technical Session, Sri Lanka (1998).
9. M.K. Jayananda & D.U.J. Sonnadara, Low Cost Data Acquisition and Control Systems for Personal Computers, IPSL, Proc. 14th Technical Session, Sri Lanka (1998).
10. H.T.M.M. Fernando & D.U.J. Sonnadara, Virtual Instrumentation: A Way to Build Low Cost Laboratory Equipment, CSSL, Proc. 17th National IT Conference (1998).
11. M.P. Warusawithana & D.U.J. Sonnadara, Speech Recognition: Application to the Sinhala Language, CSSL, Proc. 17th National IT Conference (1998).
12. M.K. Jayananda & D.U.J. Sonnadara, PC Based Data Collection and Process Control Systems for Research and Industry Applications, SLAAS, Proc. 54th Annual Session, Sri Lanka (1998).
13. H.T.M.M. Fernando & D.U.J. Sonnadara, Building Low Cost Virtual Instruments for Physics Research, SLAAS, Proc. 54th Annual Session, Sri Lanka (1998).
14. M.P. Warusawithana, D.U.J. Sonnadara, M.K. Jayananda and A. Nanayakkara, Human Voice and Speech: Creating a Simple Speech Recogniser for the Sinhala Language, SLAAS, Proc. 54th Annual Session, Sri Lanka (1998).
15. M.M.G.S. Fernando & D.U.J. Sonnadara, The Effect of Field Leakage on the Kinetic Energy Measurements of Ions emitted in a Plasma Desorption Mass Spectrometry, SLAAS, Proc. 54th Annual Session, Sri Lanka (1998).
16. Nanayakkara, M.K. Jayananda and D.U.J. Sonnadara, Comparison of FFT and Maximum Entropy Method in Sinhala Speech Recognition, SLAAS, Proc. 54th Annual Session, Sri Lanka (1998).
17. I.M.K. Fernando, D.U.J. Sonnadara, K.P.S.C. Jayaratne, S. Namasivayam and T.R. Ariyaratne, Preliminary results of implementing an automated system in Sri Lanka to locate lighting ground flashes, SLAAS, Proc. 54th Annual Session, Sri Lanka (1998).
18. A.R. Dedigama and D.U.J. Sonnadara, Parallel port based data acquisition system for IBM or compatible personal computers, IPSL, Proc. 15th Technical Session, Sri Lanka (1999).
19. D.U.J. Sonnadara, I.M.K. Fernando, S. Namasivayam, T.R. Ariyaratne, K.P.S.C. Jayaratne and K.R.A. Bandara, The role of site selection on localising ground flashes in an automated lighting detection network, IPSL, Proc. 15th Technical Session, Sri Lanka (1999).
20. A.B. Weerasekara, I.M.K. Fernando, D.U.J. Sonnadara, R. Lelwala, K.P.S.C. Jayaratne, S. Namasivayam, K.R.A. Bandara, Some features of lightning ground flash activities observed in tropical thunderstorms, C. Gomes, T.R. Ariyaratna, SLAAS, Proc. 55th Annual Session, Sri Lanka (1999).
21. 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, On the accuracy of locating lightning ground flashes using two or more direction finding stations, SLAAS, Proc. 55th Annual Session, Sri Lanka (1999).
22. D.U.J. Sonnadara, A study of LLP systems and their performance in locating ground flashes in Sri Lanka (1998-1999), IPSL, Proc. 16th Technical Session, Sri Lanka (2000)
23. H.K.W.I. Perera and D.U.J. Sonnadara, Preliminary results of short term and long term rainfall forecasting, IPSL, Proc. 16th Technical Session, Sri Lanka (2000)
24. A.B. Weerasekera, J.P. Liyanage, D.U.J. Sonnadara and I.M.K. Fernando, Measurements of lightning peak currents in the first return stroke of negative cloud to ground flashes, SLAAS, Proc. 56th Annual Session, Sri Lanka (2000).
25. J.P. Liyanage, A.B. Weerasekera, D.U.J. Sonnadara and I.M.K. Fernando, A comparison between some characteristics between positive and negative cloud to ground flashes observed in Sri Lanka and their seasonal variations, SLAAS, Proc. 56th Annual Session, Sri Lanka (2000).
26. H.K.W.I. Perera, D.U.J. Sonnadara and D.R. Jayewardene, Preliminary results of Markov model approach in forecasting wet/dry condition over short periods, SLAAS, Proc. 56th Annual Session, Sri Lanka (2000).
27. A.B. Weerasekera, J.P. Liyanage, I.M.K. Fernando, D.U.J. Sonnadara and T.R. Ariyaratne, Lightning ground flash activities in monsoon thunderstorms over Sri Lanka, Proc. Annual Sessions - 2000, Faculty of Science, University of Colombo (2000).
28. J.P. Liyanage, A.B. Weerasekera, D.U.J. Sonnadara and I.M.K. Fernando, Simulation study of the effect of random and systematic errors in magnetic direction finding stations, Proc. Annual Sessions - 2000, Faculty of Science, University of Colombo (2000).
29. D.U.J. Sonnadara, C.M. Edirisinghe and I.M.K. Fernando, Performance comparison between the magnetic direction finding technique and time-of-arrival technique, IPSL, Proc. 17th Technical Session, Sri Lanka (2001).
30. C.M. Edirisinghe, I.M.K. Fernando and D.U.J. Sonnadara, Construction of a high speed buffer amplifier to measure lightning generated vertical electric fields, IPSL, Proc. 17th Technical Session, Sri Lanka (2001).
31. W.S. Fernando and D.U.J. Sonnadara, Development of fuzzy logic based traffic control systems, SLAAS, Proc. 57th Annual Session, Sri Lanka (2001).
32. P. Goonatillake and D.U.J. Sonnadara, Development of low cost network based virtual instruments, SLAAS, Proc. 57th Annual Session, Sri Lanka (2001).
33. I.M.K. Fernando, A.B. Weerasekera, J.P. Liyanage and D.U.J. Sonnadara, Some characteristics of cloud to ground lightning obtained with lightning direction finding systems in Sri Lanka, SLAAS, Proc. 57th Annual Session, Sri Lanka (2001).
34. J.P. Liyanage, D.U.J. Sonnadara and I.M.K. Fernando, A simulation study on the correction of the systematic errors in a network of magnetic direction finding network, SLAAS, Proc. 57th Annual Session, Sri Lanka (2001).
35. P. Goonatillake and D.U.J. Sonnadara, A low cost device protector for telephone-interfaced equipment, SLAAS, Proc. 57th Annual Session, Sri Lanka (2001).
36. W.S. Fernando and D.U.J. Sonnadara, Performance of adaptive-fuzzy technique in controlling vehicular traffic, IPSL, Proc. 18th Technical Session, Sri Lanka (2002).
37. P.C.C.P.W. Goonetilleke and D.U.J. Sonnadara, Performance of parallel port based remote data acquisition systems in real-time data processing, IPSL, Proc. 18th Technical Session, Sri Lanka (2002).
38. B.W.S.P. Fernando, P.C.C.P.W. Goonetilleke, I.M.K. Fernando and D.U.J. Sonnadara, Development of microcontroller based high capacity standalone data acquisition systems, SLAAS, Proc. 58th Annual Session, Sri Lanka (2002).
39. P.C.C.P.W. Goonetilleke, B.W.S.P. Fernando, I.M.K. Fernando and D.U.J. Sonnadara, Microcontroller embedded web server with flash support, SLAAS, Proc. 58th Annual Session, Sri Lanka (2002).
40. J.P. Liyanage, C.M. Edirisinghe, D.U.J. Sonnadara and I.M.K. Fernando, Effect of distance on the measurement of multiplicity and peak currents of lightning direction finding systems, SLAAS, Proc. 58th Annual Session, Sri Lanka (2002).
41. E.P.N.S. Edirisinghe and D.U.J. Sonnadara, Using time and frequency domain information for the development of adoptive voice control devices, IPSL, Proc. 20th Technical Session, Sri Lanka (2004) 1-5.
42. N. Kottege and D.U.J. Sonnadara, Virtual robot arm control model, IPSL, Proc. 20th Technical Session, Sri Lanka (2004) 6-13.
43. U. Sonnadara, V. Cooray and R. Montano, Performance characteristics of LLP lightning locating systems, Faculty of Science Annual Sessions, Sri Lanka (2004).
44. Lightning radiation field spectra of cloud flashes, U. Sonnadara, V. Cooray and M. Fernando, ICLP, France (2004).
45. N. Philips, D.U.J. Sonnadara and M.K. Jayananda, Text to speech conversion: Tamil language, IPSL, Proc. 21st Technical Session, Sri Lanka (2005)
46. W.A.S. Wijesinghe, M.K. Jayananda and D.U.J. Sonnadara, CPLD Based Simple Microprocessor for Data Acquisition, IPSL, Proc. 21st Technical Session, Sri Lanka (2005)
47. D.I. Amarasinghe and D.U.J. Sonnadara, Analysis of tortuosity of long laboratory sparks, SLAAS, Proc. 61st Annual Session, Sri Lanka, E1-507 (2005)
48. D.I. Amarasinghe and D.U.J. Sonnadara, Optical signatures of electrical breakdown trajectories in air, SLAAS, Proc. 61st Annual Session, Sri Lanka, E1-508 (2005)
49. A.D. Kumarasiri and D.U.J. Sonnadara, Rainfall forecasting: An artificial neural network approach, IPSL, Proc. 22nd Technical Session, Sri Lanka (March 2006)
50. R.T. Sooriyaarachchi and D.U.J. Sonnadara, Development of a road traffic noise prediction model, IPSL, Proc. 22nd Technical Session, Sri Lanka (March 2006)
51. W.A.S. Wijesinghe, M.K. Jayananda and D.U.J. Sonnadara, Hardware implementation of random number generators, IPSL, Proc. 22nd Technical Session, Sri Lanka (March 2006)
52. Fractal properties of long sparks, D.I. Amarasinghe and D.U.J. Sonnadara, SLAAS, Proc. 62nd Annual Session, Sri Lanka (2006)
53. Stochastic modelling of dielectric breakdown, D.I. Amarasinghe and D.U.J. Sonnadara, SLAAS, Proc. 62nd Annual Session, Sri Lanka (2006)
54. 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)
55. 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)
56. 3D modelling of electrical discharges, D.I. Amarasinghe and D.U.J. Sonnadara, IPSL, Proc. 23rd Technical Session, Sri Lanka (March 2007)
57. 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)
58. License plate localization based on image processing, W.K.I.L.
    Wanniarachchi, D.U.J. Sonnadara and M.K. Jayananda, 2nd Int. Conf. on
    Industrial and Information Systems, Sri Lanka (August 2007).
59. 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).
60. 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).
61. 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).
62. Vehicle identification and tracking using sequence of images, L.G.C
    Wimalaratna, D.U.J. Sonnadara, CSSL, Proc. 25th National IT Conference
    (September 2007).
63. 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).
    

Presidential Addresses:

1. Information Technology: Sri Lankan Perspective, D.U.J. Sonnadara, Presidential address of Section E1 of the Sri Lanka Association for the Advancement of Science (SLAAS), Proc. 57th annual sessions, University of Moratuwa (December 2002)
2. Producing Science Graduates: Are we on the right path? D.U.J. Sonnadara, Presidential Address of the Institute of Physics, Sri Lanka, Proc. 21st Annual Sessions, University of Colombo (March 2005)
   

Books/Reports:

1. Upul J. Sonnadara, Electromagnetic Dissociation of Relativistic Si-28 by Nucleon Emission, Ph.D. Thesis, UMI-93-17963-mc (1993) 115p
2. Sri Lanka Poverty Assessment, Poverty Reduction and Economic Management Sector Unit, South Asia Region, World Bank, 22535-CE (2002)
3. Science and Technology: Sinhala Translation, ‘Vibhasha’ Translation Studies Program, Center for Policy Alternatives, ISBN: 955-8037-49-4 (2004)
4. 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)
5. 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)