Publications


 Prof. P. Wijekoon

Journal Articles

Wijekoon P. and G.Trenkler (1989) : Mean square error matrix superiority of estimators under linear restrictions and misspecification. Economics Letters 30, 141-149

Trenkler G. and P.Wijekoon (1989) : Mean square error matrix superiority of the mixed regression estimator under misspecification. Statistica Anno. XLIX, 65-71.

Dube M., Srivastava V.K., Toutenburg H. and P.Wijekoon(1991) : Stein-Rule estimator under inclusion of superfluous variables in Linear Regression Models. Communication in Statistics 20, 2009-2023.

Wijekoon P. and G.Trenkler (1995) : Pre-test estimation in the Linear Regression Model under stochastic restrictions. Ceylon Journal of Science, Physical Sciences, 2(I), 57 – 64.

Wijekoon P. (1998) : A comparison of the Restricted Ridge Regression and the Modified Ridge Regression estimators. Ceylon Journal of Science : Physical Sciences, 5(I), 75 – 79.

Hubert M.H. and P. Wijekoon (2006): Improvement of the Liu estimator in Linear Regression model. Statistical papers. Springer, 47,471-479.

Jahufer A. and P. Wijekoon (2003): A Monte Carlo Evaluation of new biased estimators in Regression model. Sri Lankan Journal of Applied Statistics, 4, 37-46

Hubert M.H. and P. Wijekoon (2004): Superiority of the stochastic restricted Liu estimator under misspecification, Statistica Anno., LXIV, n.l, 2004 pp. 153-162.

E Wencheko and P. Wijekoon (2005); Improved estimation of the mean in one-parameter exponential families with known coefficient of variation. Statistical papers. Springer, Vol 4-6, 101-116

Hubert M.H. and P. Wijekoon (2004): Comparisons between Stochastic Restricted Liu Estimators When Different Sets of Prior Information are Available, International Sri Lankan Statistical Conference: Visions of Futuristic Statistical Methodologies.

P. Wijekoon and Hubert M.H. (2004): Modified Liu Estimator with Incomplete Prior Information in Misspecified Regression Model, International Sri Lankan Statistical Conference: Visions of Futuristic Statistical Methodologies.

Hubert M.H. and P. Wijekoon (2005): Efficiency of the Stochastic restricted Liu estimator on incomplete data regression model. Ceylon Journal of Science : Physical Sciences, 10, 39-45.

Books and Scholarly Works

Wijekoon P. (1990) : Mixed estimation and Preliminary test estimation in the Linear Regression Model. Ph.D. Thesis, available in all West German Libraries.

Wijekoon P. (1996) : A Sinhala text book in Probability for G.C.E.(A.L.) students and first year university students.

Conference Proceedings

Wijekoon P. (2000) : “Application of Biased estimation in Regression Analysis”, Annual Research sessions, Faculty of Science.

E.R.M.R. Gunatilleke, P. Wijekoon et. Al. (1996) : “ Analyzing the growth performance of Shorea seedlings transplanted at different altitudes using ANOVA techniques” , Annual Research sessions, Faculty of Science.

Wijekoon P. (2001) : “Iteration and Inversion estimators in the Regression model”, Annual Research sessions, Faculty of Science.

Jahufer A. and P.Wijekoon (2001) : “ Comparison of Ridge Regression estimation and Ordinary Least squares estimation”, Annual Research sessions, Faculty of Science.

Faham M.A.A.M. and P.Wijekoon (2000) : “Application of Discriminant analysis for the classification of students in the Faculty of Science”.

Wijekoon P. (2000) : "Application of Biased estimation in Regression Analysis", Annual Research sessions. Faculty of Science.

E.R.M.R. Gunatilleke, P. Wijekoon et. Al. (1996): "Analyzing the growth performance of Shorea seedlings transplanted at different altitudes using ANOVA techniques" , Annual Research sessions. Faculty of Science.

Wijekoon P. (2001) : "Iteration and Inversion estimators in the Regression model". Annual Research sessions. Faculty of Science.

Jahufer A. and P.Wijekoon (2001) : "Comparison of Ridge Regression estimation and Ordinary Least squares estimation". Annual Research sessions, Faculty of Science.

Faham M.A.A.M. and P.Wijekoon (2000): "Application of Discriminant analysis for the classification of students in the Faculty of Science".

Wijekoon P. (2003): "Improved methods in estimation of mean in natural exponential family". Annual Research sessions, University of Peradeniya.

Ehelepola E.W.K.J.B. and Wijekoon P. (2003): "Use of Time series analysis in identifying strength of the global warming phenomena in Kandy district", Annual Research sessions. University of Peradeniya.

Noordeen F. and Wijekoon P. (2003): "Forecasting cow and buffalo milk production in Sri Lanka: a time series analysis". Annual Research sessions. University of Peradeniya.

Premeela S. and Wijekoon P. (2004): "Application of rotational residuals for normal diagnostics in regression analysis, A simulation study". Annual Research sessions. University of Peradeniya.

Kuhananthan S. and Wijekoon P. (2004): "Improved methods in estimation in K-parameter exponential family". Annual Research sessions, University of Peradeniya.

Hubert M.H. and Wijekoon P. (2004): "Efficiency of stochastic restricted Liu estimator on incomplete data regression model". Annual Research sessions, University of Peradeniya.

Niruba J. and Wijekoon P. (2004): "Use of multivariate Time series model to analyze the effect of the global warming phenomenon in Colombo district", Annual Research sessions. University of Peradeniya.

 

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 Dr. S. R. Kodituwakku

Journal Papers

Bandara K. Y., Gunathilaka M. P., Saluka R.K, Semi-Intelligent SQL framework for relational database management systems, Ceylon Journal of Science (Physical Sciences), 2005, Vol. 10, pp 47 - 53.

G. A. Samaraweera and Saluka R.K., Metamodel of design pattern catalouge: application to automated code generation,  will appear in Ceylon Journal of Science (Physical Sciences), 2006

D. M. Rasanjalee and Saluka R.K., Object-Orienetd software quality matrics, will appear in Ceylon Journal of Science (Physical Sciences), 2006.

U.H.G.R.D Nawarathna and S.R. Kodithuwakku, A Fuzzy Role Based Access Control Model for Database Security, will appear in Ceylon Journal of Science (Physical Sciences), 2006.

International Conference Papers  

Saluka R.K, Bertok P, and Liping Zhao., Pattern Categories: A Mathematical Approach for Organizing Design Patterns,In the proceedings of the KoalaPLoP2002. 

 Saluka R.K, Bertok P, and Liping Z., Pattern Language for Designing and Implementing Role-Based Access Control, In the proceedings of the KoalaPLoP2001. 

Saluka R.K, Bertok P, and Liping Z., APLRAC: Alternative Pattern Language for Designing and Implementing Role-Based Access Control, In the proceedings of the EuroPLoP2001. 

Bertok P. and Saluka R.K, Data Access Control In Virtual Organisations - Role-Based Access Control Patterns,  In the proceedings of the Eleventh International IFIP TC5 WG-5.2 - WG-5.3, 2001.

M. A. P. Neshadha Perera and S. R. Kodithuwakku , Music Chord Recognition Using Artificial Neural Networks, In the proceedings of the International Conference on Information and Automation, December 15-18, 2005, Colombo, Sri Lanka.

S. Abeysundara, B. Giritharan and S. R. Kodithuwakku, A Genetic Algorithm Approach to Solve the Shortest Path Problem for Road Maps, n the proceedings of the International Conference on Information and Automation, December 15-18, 2005, Colombo, Sri Lanka.

.H.G.R.D Nawarathna and S.R. Kodithuwakku, A Fuzzy Role Based Access Control Model for Database Security, In the proceedings of the International Conference on Information and Automation, December 15-18, 2005, Colombo, Sri Lanka.

 

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