Reconstruction of missing monthly temperature observations in Jaffna, Sri Lanka, A. Thevakaran and D.U.J. Sonnadara, J. National Science Foundation, 41 1 (2013) 23-30
Computer simulation of tree development with random variations and probabilistic growth of branches, K.D.S. Jinasena and D.U.J. Sonnadara, J. National Science Foundation, 41 3 (2013) 229-235
Study of Diurnal and Seasonal Wind Characteristics for Wind Resource Assessment, R.M. Weerasinghe, A.S. Pannila, M.K. Jayananda and D.U.J. Sonnadara, International Energy Journal, 13 4 (2012) 177-188
Fractal Nature of Simulated Lightning Channels, M.D.N. Perera and D.U.J. Sonnadara, Sri Lankan J. Physics, 13 2 (2012) 9-25
Sri Lanka stands upon the threshold of two great transformations. The first transformation is the advancement and progress of the nation from a low-income country to a middle-income country. The second transformation is the transition of the nation from a country in conflict to a country in lasting peace. The general education sector is at the heart of these two great transformations. The school system makes a unique and foundational contribution to the economic development of a country. The school system also makes a unique and foundational contribution to the social development of a nation. As such, the general education sector, which covers primary and secondary education, can and should play a prominent role in the economic and social transformation of the country. According to the information Sri Lanka is one of the better performers among developing countries, with an adult literacy rate above the expected value for its level of per capita income. However, there are a number of countries in other regions of the world, at similar or lower levels of per capita income, that enjoy literacy rates above the predicted values for their levels of per capita income, and which display a performance on literacy superior to that of Sri Lanka. These include countries such as Bolivia, Indonesia, Mongolia and the Philippines. There are also countries that have higher per capita incomes than Sri Lanka and perform better on adult literacy, such as Argentina, Brazil, Costa Rica, Colombia, China, Thailand and Uruguay. Overall, Sri Lanka performs well, but not exceptionally so.
Traffic noise enhancement due to speed bumps, S.N. Wewelwala and D.U.J. Sonnadara, Sri Lankan J. Physics, 12 (2011) 17-23
Scientific literacy is essential to stimulate an environment conducive to new knowledge generation, discovery and innovation. A quality school science education is central to building a scientifically literate population. Science education in Sri Lanka has progressed both quantitatively and qualitatively since the 1950s. Access to science education has grown steadily. This paper addresses the challenges to providing a good science education and considers pathways to the future. Policy initiatives supporting science education at present are considered. The science programme in schools is reviewed taking into account parameters such as curriculum, teaching and learning methods, learning assessments, teaching material and deployment and training of science teachers. First, learning achievements in science are assessed in the context of test scores in national assessments administered at grade eight. It is assumed that the national examinations are a suitable instrument to test learning outcomes and that at least in part reflect the quality of education.
A well-informed and knowledgeable community is of vital importance for the economic and social development of a modem society. The knowledge and skills required for present day activities are much more complex than those required in the past. Today, many jobs require expert thinking and non-routine analytical skills, to identify and solve problems. Mathematics education focuses on developing a person’s analytical and problem solving abilities. Thus a high quality mathematics education win ensure that students develop the skills that are essential not only in science and technology, but also in everyday life and the workplace. The government of Sri Lanka, recognizing the need for a high quality mathematics education has implemented several reforms in the recent past. Although the progress achieved is commendable, there is still room for improvement in certain important aspects of the learning teaching process. The main aim of the mathematics curriculum under these reforms is to create individuals who are able to think mathematically and apply mathematical knowledge effectively and responsibly in problem solving and decision making.
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
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
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
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
Sri Lanka is poised on the crest of two great waves of opportunity. The first wave can transform the nation from a low-income country to a middle-income country. The second wave can transform the nation from a country in conflict to a country at peace. The higher education sector can and must lead Sri Lanka successfully over the crests of these two waves of golden opportunity. Higher education institutions should drive and accelerate the country’s ascent to middle-income (MIC) status. Also, the higher education system should inspire the country’s values, ethics and social institutions so that Sri Lanka becomes celebrated as an enlightened and peaceful multi-ethnic, multi-religious and multi-cultural society. Sri Lanka’s future in the global knowledge economy of the twenty-first century depends critically on the country’s intellectual and human capital. The ability of people to think and act creatively, work industriously and productively, and innovate and adapt available technologies to strengthen economic activities is cardinally important in the modern world. In this context, Sri Lanka needs a higher education system that can produce skilled, hard-working and enterprising graduates. Also, the country needs research and innovation capacity capable of promoting dynamic economic development.
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
Measurement of noise within passenger trains on a coastal railway line, N.S. Pahalavithana and D.U.J. Sonnadara, Sri Lankan J. Physics, 10 (2009) 44-56
Performance of a feed-forward back-propagation artificial neural network on forecasting the daily occurrence and annual depth of rainfall at a single meteorological station is presented. Both short-term and long-term forecasting was attempted, with ground level data collected by the meteorological station in Colombo, Sri Lanka (79° 52′E, 6° 54′N) during two time periods, 1994–2003 and 1869–2003. Two neural network models were developed; a one-day-ahead model for predicting the rainfall occurrence of the next day, which was able to make predictions with a 74·3% accuracy, and one-year-ahead model for yearly rainfall depth predictions with an 80·0% accuracy within a ± 5% error bound. Each of these models was extended to make predictions several time steps into the future, where accuracies were found to decrease rapidly with the number of time steps. The success rates and rainfall variability within the north-east and south-west monsoon seasons are also discussed.
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
Modelling free flowing vehicular traffic noise, R.T. Sooriaarachchi and D.U.J. Sonnadara, Engineer, 40 2 (2008) 43-37
Fractal characteristics of simulated electrical discharges, D.I. Amarasinghe and D.U.J. Sonnadara, J. of National Science Foundation, 36 2 (2008) 137-143
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
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
Channel tortuosity of long laboratory sparks, D. Amarasinghe, U. Sonnadara, M. Berg, and V. Cooray, J. Electrostatics, 65 8 (2007) 521-526
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
Characteristics of cloud to ground lightning flashes over Sweden, U. Sonnadara, V. Cooray and T. Gotschl, Physica Scripta, 74 (2006) 1-8
Utilizing over 100 years of rainfall records in 15 meteorology stations, an analysis was carried out to extract the trends of annual rainfall depth in Sri Lanka over the last century. A statistically significant increasing trend of rate 3.15 mm/year was observed at Colombo and decreasing trends were observed at Nuwara Eliya and Kandy with rates of 4.87 mm/year and 2.88 mm/year respectively. Since no coherent increase or decrease of rainfall in any group of stations in the wet or dry zones was observed, the possibility of large scale change over the past century was ruled out. However, more recent data records (1949 onwards), revealed a decreasing trends in 13 of the 15 stations. Thus, traces of a temporal change seem to be apparent in the rainfall records over the last half century. In general, the downward trends in recent decades are steeper than the long term variations. For the recent data records, the largest downward trend of 11.16 mm/year was observed at Batticaloa.
The Sri Lankan education system has followed the classical recipe of development policy in two important respects. First, it has emphasized the importance of public financing and provision of basic education and secondary education to the entire population. This visionary emphasis, commencing in the 1930s and 1940s, was generations ahead of its time. Second, Sri Lanka limited public resources devoted to tertiary education, awarding emphasis to the basic and secondary cycles. The fruits of these policies have been reaped in subsequent generations, with basic education attainment, primary health outcomes and social development indicators close to levels observed in upper-middle income and developed countries.
Daily rainfall data recorded at 13 stations were analyzed to study the spatial patterns of rainfall in the dry zone of Sri Lanka. Principal component analysis was utilized to classify the dominant spatial regions. The first 2 eigenvectors accounted for 70.2% (the first eigenvector 54.8% and the second 15.4%) of the total variation, which clearly supports the commonly used major climatic division of Sri Lanka into wet and dry zones. Both the inverse distance weighting method and kriging successfully estimated weekly average rainfall in the North Central dry zone of Sri Lanka. For both methods, high correlation coefficients of 0.88 and 0.91 were observed for the southwest and northeast monsoon periods, respectively, with slightly lower values for intermonsoon periods. For inter-monsoon periods, the inverse distance weighting method produced better results than kriging. This work shows that the strength of the predictions depends on the rainfall seasons as well as the geometrical placement of the stations in the dry zone.
This report focuses on the attainment of five major human development-related Millennium Development Goals (MDGs) by sub-national units in Sri Lanka relating to poverty, under-five and infant mortality, child malnutrition, schooling enrollment and completion, and gender disparities in schooling.