Browsing by Author "Rathnayaka, R. M. K. T."

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Docker incorporation is different from other computer system infrastructures: A review
(Department of Industrial Management, Faculty of Science, University of Kelaniya Sri Lanka, 2021) Kithulwatta, W. M. C. J. T.; Jayasena, K. P. N.; Kumara, B. T. G. S.; Rathnayaka, R. M. K. T.
Currently the computing world is getting complex, innovating and maturing with modern technologies. Virtualization is one of the old concepts and currently containerization has arrived as an alternative and innovative technology. Docker is the most famous and trending container management technology. Different other container management technologies and virtualization technologies are respective other corresponding technologies and mechanisms for Docker containerization. This research study aims to identify how Docker incorporation is different from other computer system infrastructure technologies in the perspective of architecture, features and qualities. By considering forty-five existing literatures, this research study was conducted. To deliver a structured review process, a thorough review protocol was conducted. By considering four main research questions, the research study was lined up. Ultimately, Docker architecture and Docker components, Docker features, Docker integration with other computing domains and Docker & other computing infrastructures were studied. After synthesizing all the selected research studies, the cream was obtained with plenty of knowledge contribution to the field of computer application deployment and infrastructure.
Impact of Macroeconomic Variables on Stock Market Returns: A Case Study of Colombo Stock Exchange, Sri Lanka.
(8th International Conference on Business & Information ICBI – 2017, Faculty of Commerce and Management Studies, University of Kelaniya, Sri Lanka., 2017) Rathnayaka, R. M. K. T.; Seneviratna, D. M. K. N.
Unexpected circumstances with respect to the social and economic conditions, the stock market indices have been moving up and down with high volatility. This study examines the equilibrium relationships between the stock market indices and macro-economic factors in Sri Lankan during the period from January, 2009 to December 2016 to capture the linear inter-dependencies, by using Vector Autoregressive Regression and Vector Error Correlation Model, Estimated co-integration rank test and Max-eigenvalue test suggested that there are two co-integration equations exist at the 0.05 level of significance. Furthermore, findings revealed that macroeconomic variables have direct effect on high volatility in Stock Market fluctuations. Moreover, the results concluded that Colombo Stock Exchange (CSE) is highly sensitive to the macroeconomic variables such as real gross domestic product and broad money supply.
Investigation of effort estimation practices in small-scale agile software products
(Research Symposium on Pure and Applied Sciences, 2018 Faculty of Science, University of Kelaniya, Sri Lanka, 2018) Mahisha, J. N. N.; Gunawardana, H. M. K. T.; Rathnayaka, R. M. K. T.
Effort estimation plays an important role in software projects and reflects on their success. The effort of a software development project is generally defined as the time consumed by the project and can be expressed as the number of person-hours, days, months or years, depending on the size of the project. The agile software development methodology which is based on iterative development, generally evolves through the collaboration between selforganizing cross-functional teams. Therefore, the most of the software development projects have been following agile software development practices today. In this research, we mainly focus on Agile Scrum methodology. First, we investigated the certain parameters identified through the systematic literature review including size measurement metrics such as lines of codes, function point, component point, as well as involvement of team members, historical data related to the previous projects and expertise involvements. Through the systematic literature review 14 different parameters of the effort estimation process, the related effort estimation models were identified. From the identified 14 parameters, the most common and applicable 4 parameters were selected to build a questionnaire and got the feedback of 50 IT professionals during the survey study. Results obtained through the systematic literature review were put on to the taxonomy by considering their effect on each selected effort estimation model. The correlation among constructs was estimated using Pearson Correlation Coefficient. The study has revealed that there is a strongest relationship between the parameters namely, expertise involvement, team member involvement, historical data and number of lines of codes to the effort of a software development. For more accurate estimates, the most influential factors are the involvement of expertise, involvement of team members and the use of historical data, respectively.
Modeling the Best ARIMA Modeling Approach for Forecasting Market Indices in Colombo Stock Exchange, Sri Lanka.
(8th International Conference on Business & Information ICBI – 2017, Faculty of Commerce and Management Studies, University of Kelaniya, Sri Lanka., 2017) Madushani, M. L. P.; Erandi, M. W. A.; Madurangi, L. H. L. S.; Sivaraj, L. B. M.; Weerasinghe, W. D. D.; Jayasundara, D. D. M.; Rathnayaka, R. M. K. T.
Generally, the movements of the stock prices are highly volatile and make much more dynamics. As a result day by day the large number of companies has been listed on stock exchanges across the world. Under this scenario, examine a suitable model for forecasting stock prices is a biggest challenge in the modern world. The propose of this study is to examine a suitable model for forecasting stock prices in the Colombo Stock Exchange (CSE), Sri Lanka. Since the data has a non-seasonal linear trend, an autoregressive integrated moving average model was used for modeling and forecasting. The empirical results suggested that ARIMA model is more accurate for forecasting ASPI index than other traditional regression methods.
Physicochemical, techno-functional and hypoglycemic properties of selected wheat flour substitutes
(Faculty of Science, University of Kelaniya, Sri Lanka, 2021) Ranasinghe, M. M. K. D.; Gayathri, S. M. D. S.; Dias, P. G. I.; Anuradha, N. G. D.; Kananke, T. C.; Perera, M. G. A. N.; Rathnayaka, R. M. K. T.; Sabaragamuwa, R. S.; Wickramarathne, M. N.; Rathnayaka, R. M. U. S. K.
Wheat flour is one of the major refined carbohydrate sources consumed by Sri Lankans. However, long term consumption of such refined starch sources is linked with a high prevalence of various non-communicable diseases, such as obesity, heart disease, and type 2 diabetes. Therefore, the consumers are now concerned about the potential of using wheat flour substitutes for healthy food recipes. The present study was conducted to find the possibility of utilizing Musa paradisiaca (Ash plantain), Cycas cricinalis (Cycas) and Caryota urens (Kithul) flour types as wheat flour alternatives. The Cycas flour was prepared from the fruits of C. cricinalis and the fruits were sun dried for 3-4 days to remove toxicity before milling. The Kithul flour was extracted from the stem of C. urens. The Ash plantain flour was prepared using well ripened fingers of M. paradisiaca, followed by blanching, drying and milling. The proximate composition, techno-functional and hypoglycemic properties of prepared flour substitutes were determined and compared with wheat flour. The proximate compositions were determined using AOAC approved protocols on a dry matter basis. The pH, water activity, Water Absorption Capacity (WAC), Oil Absorption Capacity (OAC), and swelling properties were determined using appropriate physical and chemical methods. In vitro starch-hydrolyzation method was used to evaluate the Hydrolysis Index (HI), predicted Glycemic Index (GI), and Glycemic Load (GL). Among the flour types considered, the lowest crude fat content was observed in C. urens (1.96 ± 0.23%) while the lowest total carbohydrate content was observed in C. cricinalis (33.15±0.75%). All flour substitutes showed significantly (at P<0.05) less carbohydrate contents compared with that of wheat flour. Further, M. paradisiaca, C. cricinalis, C. urens showed significantly (p<0.05) high fiber contents compared to wheat flour. The WAC and OAC of the three flour substitutes were significantly higher than the wheat flour (at p<0.05). The highest WAC and OAC were observed in C. urens and C. cricinalis, respectively. Although wheat flour reported the highest swelling capacity, it was not significant (at p<0.05) compared to that of other flour types. The lowest predicted HI and GI was observed in M. paradisiaca. However, the HI and GI values (143.93±0.88, 118.73±0.48) of C. urens were higher than that of wheat flour (100±4.55, 94.61±2.5), respectively. The GL values of alternative flour types were significantly (at p<0.05) lower than wheat flour (63.48±1.68) and the value of C. cricinalis (26.68±0.63) obtained the least. Accordingly, C. cricinalis and M. paradisiaca have great potential to be used as a substitute for wheat flour. However, further investigations are to be done to find the best proportions of flour composites to formulate different food items.