Research Publications Authored by SLIIT Staff

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This collection includes all SLIIT staff publications presented at external conferences and published in external journals. The materials are organized by faculty to facilitate easy retrieval.

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Now showing 1 - 6 of 6
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    PublicationEmbargo
    Comparison of ARIMA and LSTM in Forecasting the Retail Prices of Vegetables in Colombo, Sri Lanka
    (IEEE, 2022-12-09) Fonseka, D.D; Karunasena, A
    Identification of vegetable price trends is important to make better decisions in the production and market. Due to several factors, including seasonality, perishability, an imbalanced supply-demand market, customer choice, and the availability of raw materials, vegetable prices fluctuate quickly and are highly unstable. In this study price prediction was concluded using two models ARIMA and LSTM with retail price data for Cabbage, Carrot, and Green beans in Colombo from 2009 to 2018. According to the decision criteria of RMSE and MAPE, the LSTM model is superior to the ARIMA model in predicting the retail prices of vegetables. There were no studies have focused on predicting prices with novel technology in the Sri Lankan vegetable market. Hence the results of this study can be used to build an advanced forecasting model by the government and decision-makers in agriculture in Sri Lanka.
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    PublicationOpen Access
    Inhabitants’ Satisfaction in Neighbourhood Sustainability: Insights from Colombo
    (Center for Environmental Planning and Technology University, 2021-01) Wijesundara, J; Weerasinghe, U. G. D; Perera, L. S. R
    Despite an increasing number of studies on the evaluation of sustainable neighbourhoods, only a few have paid attention to the identification of the components that influence the degree of inhabitants' satisfaction. A neighbourhood is a built entity that situates the experiences of daily lives of a group of inhabitants in an identifiable geographical space, while neighbourhood sustainability is the process of nurturing its environment to support and meet both economic and social needs of its inhabitants. A sustainable neighbourhood should ensure a desired quality of life and satisfaction to its inhabitants by inter-twining the local,social, environmental, and economic aspects to enable its sustenance as a wholesome place to live. However, most neighbourhoods do not do so. This paper investigates an urban residential neighbourhood in Colombo: the Newham Square, and examines the degree of inhabitants’ satisfaction based on their evaluations. It assesses neighbourhood sustainability under the three main sustainability parameters: environmental, social, and economic facets. Physical and non-physical elements of the neighbourhood form is investigated by using secondary data. Structured interviews were carried out to ascertain inhabitants’ satisfaction while physical observations were made to identify the deterministic elements. Finally, it concludes that the neighbourhood form has a significant role to play in ensuring inhabitants’ satisfaction and therefore neighbourhood sustainability.
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    PublicationOpen Access
    A gap analysis to measure service quality of university libraries through user perspectives: a case study at the University of Colombo
    (KDU Library, 2010) Somaratna, H. M. D. S. D; Peiris, C. N; Jayasundara, C. C
    User expectations and perceptions are important measures of service quality in academic libraries and service quality is frequently defined in terms of reducing the gap between user expectations and the service provided. The assessment of service quality through user perspectives provides an important feedback for libraries. The aim of this research was to determine the gap between user desired service expectations and actual service perceptions of the University of Colombo Library System to provide a better service to satisfy their expectations. This study conducted as a user survey covered 614 users of the Colombo University Library system. A modified version of a SERVQUAL model was used to ascertain the views of library users about service level. They were asked to assess the actual service delivered by the library; to establish the importance of the service to them as users; and, to identify to what extent the service met their expectations. The largest service quality gap among all the attributes applied to the Colombo University Library System was “Access to electronic journals”. The author’s fervent hope is that this research would provide insights for further research in this field which in turn would eventually help decision makers to improve service quality in our academic libraries.
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    PublicationOpen Access
    Impact of urbanization on earth resources in suburbs of Colombo, Sri Lanka
    (NSF: Colombo, 2019) Rathnayake, U. S
    Climate change is believed to be a critical issue and there is enough evidence to identify the impact of climate change. Sri Lanka is expected to be one of the most affected countries from adverse impact of climate change. Various climatic models propose a rise of rainfall intensity to south Asian region while the number of rainy days are to be reduced. Therefore, the necessity is raised to find the clear trends in climatic factors in the region. However, a very few research work was carried out to see the climatic changes over the last few decades in Sri Lanka. Temporal variation of precipitation (rainfall) can be a good indicator to identify the trends in climate. In addition, these rainfall variations are used in many engineering aspects, including design of massive civil engineering structures like dams, design of water supply networks, etc. Furthermore, the rainfall variations are not only important in engineering aspects but also heavily in agriculture. Therefore, this research work targets to find the temporal variations of rainfall n Sri Lanka and then, to project the results to the available water resources.
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    PublicationOpen Access
    Comparison of different analyzing techniques in identifying rainfall trends for Colombo, Sri Lanka
    (Hindawi, 2020-08) Perera, A; Ranasinghe, T; Gunathilake, M. B; Rathnayake, U. S
    Identifying rainfall trends in highly urbanized area is extremely important for various planning and implementation activities, including designing, maintaining and controlling of water distribution networks and sewer networks and mitigating flood damages. However, different available methods in trend analysis may produce comparable and contrasting results. Therefore, this paper presents an attempt in comparing some of the trend analysis methods using one of the highly urbanized areas in Sri Lanka, Colombo. Recorded rainfall data for 10 gauging stations for 30 years were tested using the MannKendall test, Sen’s slope estimator, Spearman’s rho test, and innovative graphical method. Results showcased comparable findings among three trend identification methods. Even though the graphical method is easier, it is advised to use it with a proper statistical method due to its identification difficulties when the data scatter has some outliers. Nevertheless, it was found herein that Colombo is under a downward rainfall trend in the month of July where the area receives its major rainfall events. In addition, the area has several upward rainfall trends over the minor seasons and in the annual scale. Therefore, the water management activities in the area have to be revisited for a sustainable use of water resources.
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    PublicationOpen Access
    Problems and prospects of utilizing canal banks to enhance the built-environment in Colombo
    (NSF, 2003-07-27) Perera, R
    Waterfronts are assets that enhance the quality of built-environment in urban areas. They are used as public and recreational spaces in many cities around the world. However, cities and towns in Sri Lanka most often turn their back to water bodies. Colombo has environmental assets in the form of a sea front, a lake and a canal network, yet not much attempt has been made to utilize their potential to enhance the quality of environment of the city until recent times. The lake is being rehabilitated while the canal network has already been rehabilitated under externally funded projects. It is observed that the rehabilitated canal network is fast falling back to its previous state of stagnation and pollution due to non-utilization of improved canals and banks. This paper focuses attention on possible strategies to sustain their improved environmental quality in order to enhance the built-environment of the city