I, Sebastian Reyalt Gnanapragasam, am currently attached to the Department of Mathematics as a Senior Lecturer. I graduated from the University of Peradeniya (PDN) in 2005 with B. Sc degree Specialization in Mathematics and worked as a Temporary Assistance Lecturer at the Department of Mathematics at PDN from 2005 to 2007. Then I moved to the Department of Engineering Mathematics at PDN as a Temporary Instructor till 2008. In 2008, I joined the Department of Mathematics and Computer Science, The Open University of Sri Lanka (OUSL) as a Lecturer (Probationary). I completed an M. Sc in Applied Statistics at Postgraduate Institute of Science (PGIS), PDN in 2012. Later, in 2016, I earned another master degree, M. Sc in Operational Research at the University of Moratuwa. In 2016, I was promoted to the Senior Lecturer at the Department of Mathematics, OUSL.
Mr. S. Reyalt Gnanapragasam
B. Sc (Honors) Mathematics, M. Sc (Applied Statistics), M. Sc (Operational Research).
Senior Lecturer G II (on study leave)
Dept. of Mathematics
- Room No 334, 3rd Floor, Science and Technology building, Central Campus, Nawala, Nugegoda.
- +94112881443 Ext: 3403
- srgna@ou.ac.lk
Mathematics
- Senior Lecturer (Grade II) from 01-07-2016 to date
- Lecturer (Probationary) from 01-09-2008- 30-06-2016
- Temporary Lecturer from 04 to 31-08-2008
- Temporary Instructor From August 2007 to July 2008
- Temporary Assistant Lecturer From June 2005 to April 2007
ADU5300- Linear Programming
ADU5308- Graph Theory
PEU5302- Combinatorics
PEU5304- Introduction to Complex Analysis
PEU3300- Mathematical Logic and Mathematical Proofs
PEU3202- Vector Spaces
- Gnanapragasam, S. R. (2010). Assessments in Open and Distance Learning Methodology, Learner- Centered Teaching Methodology & Technology to Assess Students, Staff Development Center, Wayamba University of Sri Lanka, p. 76-101.
- Gnanapragasam, S. R. and Daundasekera, W. B. (2022) “Optimal Solution to the Capacitated Vehicle Routing Problem with Moving Shipments at the Cross-docking Terminal”, International Journal of Mathematical Sciences and Computing (IJMSC), Vol.8, No.4, pp. 60-71, 2022. DOI: 10.5815/ijmsc.2022.04.06
- Gnanapragasam, S. R. (2020). Ranking and Grouping the Districts of Sri Lanka based on the expenses of households: A Multivariate Analysis, Ruhuna Journal of Science 11(1), 83-97. http://doi.org/10.4038/rjs.v11i1.89
- Gnanapragasam, S. R. (2018). Tourist Arrivals in Sri Lanka: A Comparative Study of Holt-Winter’s versus Box-Jenkin’s Modeling Methods, OUSL Journal 13(1), 65-91.
- Gnanapragasam, S. R. (2018). Outbreaks of Leptospirosis in selected districts of Sri Lanka, International Journal of Academic Research and Development 3(6), 27-32.
- Gnanapragasam, S. R. (2017). An empirical study on human leptospirosis cases in the western province of Sri Lanka, OUSL Journal 12(1), 109-127.
- Gnanapragasam, S. R. (2017). A multivariate approach to classify the districts of Sri Lanka based on the cost of living, International Journal of Information Research and Review 4(5), p. 4128-4132. Full Paper: http://www.ijirr.com/sites/default/files/issues-files/1656.pdf
- Gnanapragasam, S. R. Cooray, T. M. J. A. (2016). Forecasting Post-War Tourist Arrivals to Sri Lanka using Dynamic Transfer Function method, International Journal of Multidisciplinary Studies (IJSM), Vol 3(2), p. 111-122. Full Paper: http://journals.sjp.ac.lk/index.php/ijms/article/view/2807/1846
- Gnanapragasam, S. R. (2016). Modeling and Forecasting Dengue Cases in the area of Colombo Municipal Council in Sri Lanka, International Journal of Scientific and Research Publications, Vol 6(8), p. 206-213. Full Paper: http://www.ijsrp.org/research-paper-0816/ijsrp-p5627.pdf
- Gnanapragasam, S. R. and Daundasekera, W. B. (2022) “Optimal Solution to the Capacitated Vehicle Routing Problem with Moving Shipments at the Cross-docking Terminal”, International Journal of Mathematical Sciences and Computing (IJMSC), Vol.8, No.4, pp. 60-71, 2022. DOI: 10.5815/ijmsc.2022.04.06
- Gnanapragasam, S. R. and Daundasekera, W. B. (2022) “Open Vehicle Routing Problem with Moving Shipments at the Cross-docking Terminal”, PGIS Research Congress (RESCON2022), p.50.
- Gnanapragasam, S. R. (2020). Time series behavior of Indian visitors to Sri Lanka: A post conflict perception, Proceedings of 7th Ruhuna International Science and Technology Conference (RISTCON 2020), p.64.
- Gnanapragasam, S. R. (2017). Modeling seasonal Leptospirosis cases in Western province of Sri Lanka, Proceedings of 4th Ruhuna International Science and Technology Conference (RISTCON 2017), p.37.
- Gnanapragasam, S. R. Cooray, T. M. J. A. Dissanayake, R. (2016). Prediction of international tourist arrivals to Sri Lanka using state space modeling method: An empirical study after the civil war, Proceedings in Medical, Allied Health, Basic and Applied Sciences, 9th International Research Conference- KDU, Sri Lanka, p. 50-55. Full Paper: http://www.kdu.ac.lk/proceedings/irc2016/2016/FAHS011.pdf
- Gnanapragasam, S. R. Cooray, T. M. J. A. (2016). Tourist Arrivals After the internal conflict in Sri Lanka: A Time Series Analysis using Holt- Winter’s Method, Proceedings of Open University Research Sessions (OURS 2016), p.59. Extended Abstract: http://www.ou.ac.lk/ours/wp-content/uploads/2017/04/B206-E.pdf
- Gnanapragasam, S. R. Cooray, T. M. J. A. (2016). Forecasting Post-War Tourist Arrivals to Sri Lanka using Dynamic Transfer Function method, Proceedings of 3rd International Conference on Multidisciplinary Approaches (iCMA 2016), p.88.
- Gnanapragasam, S. R. Cooray, T. M. J. A. Dissanayake, R. (2016). Prediction of international tourist arrivals to Sri Lanka using state space modeling method: An empirical study after the civil war, Proceedings of 9th International Research Conference on Professional Integration for a Secure Nation, p. 202.
- Gnanapragasam, S. R. (2016). Classification of Districts in Sri Lanka based on cost of living: A multivariate approach, Proceedings of Wayamba International Conference (WinC2016), p. 18
- Gnanapragasam, S. R. Cooray, T. M. J. A. (2016). An empirical analysis of forecasting international tourist arrivals to Sri Lanka by using Box-Jenkin’s method: A postwar perspective, Proceedings of Wayamba International Conference (WinC2016), p.19
- Gnanapragasam, S. R. Cooray, T. M. J. A. (2016). Prediction of Dengue Fever Cases in Sri Lanka using Time Series Analysis, Proceedings of 3rd Ruhuna International Science and Technology Conference (RISTCON 2016), p. 35.
- Gnanapragasam, S. R. Cooray, T. M. J. A. (2015). Time Series Models to Forecast Dengue Fever Incidences in Western Province of Sri Lanka, Proceedings of 8th International Research Conference on Inculcating Professionalism for National Development, p. 46-52. Full paper: http://www.kdu.ac.lk/proceedings/irc2015/2015/bas-011.pdf
- Gnanapragasam, S. R. Perera, K. (2012). Fitting generalized lambda distribution to the difference of spatial elevations data in Sri Lanka, Proceedings of Annual Academic Sessions 2012, The Open University of Sri Lanka, p. 194-197. Extended Abstract: http://digital.lib.ou.ac.lk/docs/bitstream/701300122/595/1/OU5197_000.pdf
- Gnanapragasam, S. R. Perera, K. Ratnayake, U. R. (2012). Statistical model to predict contour elevation using shuttle radar topographic mission digital elevation data, Proceedings of the 2nd International Conference on Sustainable Built Environment (ICSBE 2012), p. 197. Full paper: http://dl.lib.mrt.ac.lk/bitstream/handle/123/9052/SBE-12-197.pdf?sequence=1
- Gnanapragasam, S. R. and Daundasekera, W. B. (2022) “Open Vehicle Routing Problem with Moving Shipments at the Cross-docking Terminal”, PGIS Research Congress2022 (RESCON2022), p.60.
- Gnanapragasam, S. R. and Daundasekera, W. B. (2022) ” A mathematical model for the hard time windows vehicle routing problem with moving shipments at the cross dock centre”, International Open University Research Sessions 2022 (iOURS2022), p.136.
