Late Prof. H.Y.R. Perera

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  • Faculty of Engineering
  • Department of Electrical Engineering
  • Professor Emeritus

Research Activities

Key Research Areas
Queuing Theory
Stochastic simulation
Rural Electrification
Traffic modeling & Performance Evaluation

Education and Training

Education
BSc Eng(S.Lanka), Dip.Ing(Aachen), Dr.Ing(Aachen), CEng, MIE(Sri Lanka)

Publications*

Publications
  1. Ranjit Perera, "The Variance of Delay Time in Queuing System M/G/1 with Optimal Strategy SRPT", AEÜ, Vol. 47 (1993), pp 110-114.
  2. Ranjit Perera, Friedrich Schreiber,  "Distribution function and local correlation of the delay time in queuing system M/G/1-SRPT", AEÜ, Vol. 47 (1993), pp 108-110.
  3. JR Lucas, HYR Perera, PDC Wijayatunga, DC Wijeratne, T Siyambalapitiya, TAK Jayasekera, "Energy efficient lighting for households: A Survey". SLEMA Journal, Sri Lanka Energy Managers Association, Sri Lanka, Vol. 6 (1995), pp 1-9.
  4. HYR Perera "Impact of Electrification on Quality of Rural life", Transactions of the IEE Sri Lanka Centre, Volume 1 #1(1996), pp 10-17.
  5. HYR Perera, "Rural Electrification Policy", OUR Engineering Technology, Open University of Sri Lanka, Volume 3 #1, March 1997, pp 58-61.
  6. HYR Perera, C Görg, F Schreiber, "Higher Order Local Correlation Coefficients of Occupancy in the Queues M/M/1 and M/M/1/N ", AEÜ, Vol. 52 (1998).
  7. HYR Perera, "Peak shaving through multi-mode operation of household refrigerators", SLEMA Journal, Sri Lanka Energy Managers Association, Vol. 7 (1998).
  8. HYR Perera, CVK Periyapperuma, UKDLP Udawatta, , "Technical Standards for Low Cost Distribution of Electricity in Village Hydro Schemes”,  Transactions of the IEE Sri Lanka Centre, Volume 3 #1 January 2001, pp 29-35.
  9. Luis M. Coreia, Erik R. Fledderus, Ellen Meijerink,  Ranjit Perera, Antonio Serrador, Ulrich Tűrke, Miranda J. G. van Uitert, Thomas Winter,  "Identification of relevant parameters for traffic modeling and interference estimation" published in http://momentum.zib.de  by  Information Society Technologies (IST), The European Commission, 2001.
  10. Ranjit Perera, Eugen Lamers, Carmelita Görg, , "Optimum Number of Restarts in Multi-Threshold RESTART Simulations”,  Proceedings of Fourth International Workshop on Rare Event Simulation and related Combinatorial Optimization Problems RESIM/COP’02,  11-12 April 2002, Madrid Spain.
  11. Ranjit Perera. Andreas Eisenblätter, Erik Fledderus, Carmelita Görg, Michael Schutzow, Stefan Vervijmeren, “Pixel Oriented Mobility Modelling for UMTS Network Simulations”,  Proceedings of IST Mobile and Wireless Tele-communications Summit 2002, 17-19 June 2002, Thessaloniki, Greece, pp 828-831.
  12. Ulrich Tűrke, Thomas Winter, Ranjit Perera, Eugen Lamers, Ellen Meijerink, Erik R. Fledderus,   Antonio Serrador,  "Comparison of different simulation approaches for cell performance evaluation" published in http://momentum.zib.de  by Information Society Technologies (IST), The European Commission, 2002.
  13. Ulrich Türke, Ranjit Perera, Eugen Lamers, Thomas Winter, Carmelita Görg,  “An Advanced Approach for QoS Analysis in UMTS Radio Network Simulations”,  Proceedings of ITC18, Berlin Germany, September 2003, pp 91-100.
  14. Eugen Lamers, Ranjit Perera, Ulrich Türke, Carmelita Görg, “Short Term Dynamic System Level Simulation Concepts for UMTS Network Planning”, Proceedings of ITC18, Berlin Germany, September 2003 pp 101-110.
  15. DGAK Wijeratna, JR Lucas, J Pieris, HYR Perera, "Development of a software package for calculating current rating of medium voltage power cables”,  Transactions of the IEE Sri Lanka Centre, Volume 5 #1 September 2003, pp 50-57.
  16. Ulrich Tűrke, Thomas Winter, Eugen Lamers, Ranjit Perera,  "Simulation Scenarios Including Quality of Service Aspects" published in http://momentum.zib.de by Information Society Technologies (IST), The European Commission, 2003.
  17. Ulrich Tűrke, Thomas Winter,  Eugen Lamers, Ranjit Perera, Lucio Ferreira, "Evaluation of the Influence of User Mobility on Average Traffic Load" published in http://momentum.zib.de Information Society Technologies (IST), The European Commission, 2003.
  18. Thomas Winter, Ulrich Tűrke, Eugen Lamers, Ranjit Perera, Antonio Serrafdor, Luis M. Correia "Advanced simulation approach for integrated static and short-term dynamic UMTS performance evaluation" published in http://momentum.zib.de by Information Society Technologies (IST), The European Commission, 2003.
  19. Ranjit Perera, Eugen Lamers, Carmelita Görg , Ulrich Tűrke, Thomas Winter, “Analysis of Soft-Handover Characteristics in Realistic Urban UMTS Radio Networks”, 59th IEEE Vehicular Technology Conference, May 2004-Spring, Milan. Italy, Vol. 4, pp. 2317-2321 Vol.4
  20. Ulrich Tűrke, Ranjit Perera, Eugen Lamers, Thomas Winter, Carmelita Görg, “An integrated Simulation Approach for Static and Dynamic UMTS Radio Network Performance Evaluation”, Proceedings of the 1st Regional Conference ICT and E-Paradigms. June 2004, Colombo, Sri Lanka, pp 25-30.
  21. NNR Mendis, EMMB Yatiyana, Wijesinghe K, JR Lucas, Ranjit Perera, “Design and Construction of Constant Voltage Transformer”, ICIIS 2006, First International Conference on Industrial and Information Systems, 8 -11 August 2006, Peradeniya, Sri Lanka, pp. 40-45.
  22. Kusum Shanthi, Ranjit Perera, Sarath Perera, “Benchmarking the Sri Lankan Power System by a Power Quality Monitoring Program”, ICIIS 2006, First International Conference on Industrial and Information Systems, 8 -11 August 2006, Peradeniya, Sri Lanka, pp 211-216.
  23. Kusum Shanthi, Ranjit Perera, Sarath Perera, “Utility Power Tapping Point for the Commercial Buildings will be a key factor during site selection”, BETNET 2006, 2nd IET International conference on building Electrical Technology, Kuala Lumpur, Malaysia 31st Oct. – 2nd Nov. 2006. 6 pages (CD-ROM).
  24. Thusara Weerawardane, Ranjit Perera, Andreas Timm-Giel, Carmelita Görg, “A Markovian Model for HSDPA TNL Congestion Control Performance Analysis”,68th IEEE Vehicular Technology Conference, 2008-September (Fall), Calgory, Canada. pp. 1-6.
  25. Ranjit Perera, “New legislation, new challenges & new trends in Sri Lankan Electricity sector”, Proceedings of the 10th Regulators & Policymakers retreat, July 23-27, 2009, Goa, India, pp 227-232.
  26. A S Indatissa, H Y R Perera, T Siyambalapitiya, “Economics of reaching year 2015 non-conventional renewable electricity generation objectives of Sri Lanka”, Publication of papers presented at the International Conference on ‘Climate on the edge’, Moumt Lavinia, Sri Lanka, November 26-27, 2010, pp 25-32
  27. M. Chanaka, Kusum Shanthi, Ranjit Perera, “Modelling of power transmission lines for lighting back flashover analysis(A case study: 220kV Biyagama-Kotmale transmission line)”, ICIIS 2011, 6th IEEE International Conference on Industrial and Information Systems, 2011, pp. 40-45
  28. Thusara Weerawardane, Ranjit Perera, Carmelita Görg, “ A markov model for HSDPA TNL Flow Control and Congestion Control Performance Analysis”,73rd IEEE Vehicular Technology Conference, 2011-May (Spring), Budapest, Hungry. pp. 1-6.
  29. Ranjit Perera, “Mean Value Formulae for the Queues M/G/1-SPT & M/G/1-SRPT: A New Method of Derivation Using Differential Equations”, Silhouette, Journal of the Sir John Kotelawala Defence University -2011.
  30. Thusara Weerawardane, Ranjit Perera, Carmelita Görg, “Impact of Machine to Machine (M2M) Communication on Disaster Management in Future Mobile Networks”InternationalSymposium– 2012, Kotelawala Defence University, August 2012, pp 378-393.
  31. KKYW Perera, Ranjit Perera, Jayasirl Krunanayaka, Raja Amarathunga, “Development and Utilization of Power & Energy: A Brief Overview” Book published under the centenary commemoration publications of IESL, 2012, 89 pages.
  32. Ranjit Perera, SP Thusara,”Distribution reliability improvement through optimal load break switches in 33kV network”, Proceedings of KDU Symposium 2013, 22-23 August 2013, Ratmalana, pp 269-272.
  33. Ranjit Perera, G T F De Silva, S Bogahawatta,”Hydro Power from Existing Reservoirs”, Proceedings of KDU International Research Conference 2014, 21-22 August 2014, Ratmalana, 7 pages.
  34. Ranjit Perera, KMIN Kuruppu, ”Optimizing Energy Output at Canyon Hydro Power Station: A Case Study”, Proceedings of KDU International Research Conference 2014, 21-22 August 2014, Ratmalana, 6 pages.

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