Institutional-Repository, University of Moratuwa
Welcome to the University of Moratuwa Digital Repository, which houses postgraduate theses and dissertations, research articles presented at conferences by faculties and departments, university-published journal articles and research publications authored by academic staff. This online repository stores, preserves and distributes the University's scholarly work. This service allows University members to share their research with a larger audience.
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Recent Submissions
item: Conference-Full-text
Relative Tsunami vulnerability of structural materials across tsunami events
(IEEE, 2025) Ukwaththa, UJ; Dias, WPS
The influence of structural material on tsunami vulnerability is well established. However, there are shortcomings in incorporating this effect into vulnerability models. This study was conducted to compute the overall building damage due to a tsunami from fragility curves and replacement cost coefficients, and to identify the influence of different structural materials on structural vulnerability. The damage curves were of negative exponential form, with the influence of differing structural materials characterized by the single parameter defining those curves, i.e. the ‘n’ value. The results confirmed the established knowledge that vulnerability increased from RC through steel and masonry to timber structures. More importantly, they highlighted the fact that relative vulnerability is coupled with inundation depth, since, at depths approaching around 6 m, all materials will incur similar heavy damage. The most important finding of this work is that there is less modelling variance across tsunami events if a relative vulnerability approach is used (with each material compared to reinforced concrete), rather than using a mean ‘n’ value for each material across all tsunami events.
item: Conference-Full-text
Optimization of transport networks: with special reference to fluctuating demand for fisheries
(IEEE, 2025) Kularatne, B; Premasiri, H; Jayasundara, R
The fish market in Sri Lanka is a perfectly competitive market in terms of price. The supply of fishery items can be changed due to various factors such as weather patterns, fishery harvest taken by fishing boats, etc. According to the availability of harvest the supply need to be adjusted for different selling points for optimum sales. This research considered a fisheries company which requires an established distribution network within Colombo, Sri Lanka. Integer programming is used to adjust the supply for the selling points. After the allocation of stocks for locations most profitable locations are selected for the selling operation. This ”specific vehicle routing problem” was solved using the Google Colabs platform with the combination of using Python language and some set of traditional search algorithms. The lowest number of kilometers for the operation given by the results were taken for the operation since the number of kilometers is an important factor in reducing the cost of the total operation. The Tabu search method resulted in the minimum operational kilometers which is 146.573 km using five vehicles at a total cost of at a rate of 150 LKR per kilometer.
item: Conference-Full-text
Organizational capabilities for implementing building information modeling (BIM) technology
(IEEE, 2025) Jayaweera, C; Wijekoon, A
The Architecture, Engineering, and Construction (AEC) industry introduced Building Information Modeling (BIM) technology in the early 2000s to create and manage data during a building's design, construction, and operational phases. This research aims to understand organizational capabilities required for BIM implementation in the Sri Lankan AEC industry, focusing on Small to Medium scale Enterprises (SME) and capability development activities for successful implementation. A qualitative study using semi-structured interviews was conducted.
item: Conference-Full-text
Comparative effects of ground calcium carbonate and marble dust on morphological and Yield responses of corn (Zea mays) in acidic soils
(IEEE, 2025) Falceso, JFF; Blancia, GVV; Fetalvero, EG; Catajay-Mani, MP; Gacu, JG
Acidic soil hinders crop production by limiting nutrient availability and plant growth; marble dust, a byproduct of the marble processing industry, can be a sustainable soil amendment. This study evaluated Ground Calcium Carbonate (GCC) and Marble Dust (MD) as soil amendments to improve soil pH and enhance corn growth. GCC, refined from MD using a ball mill roller, and MD, directly sourced from marble processing waste, were applied at five levels: 0g (control), 125g, 250g, 375g, and 500g per pot. Conducted in a screenhouse using a split-plot completely randomized design, the study assessed stalk diameter, plant height, corn weight, and soil pH. ANOVA and Tukey’s HSD tests revealed significant improvements across treatments, with 250g and 375g applications achieving optimal results. Soil pH increased from 5.3 to over 8.0, and corn yield improved notably. However, higher application rates (500g) offered no additional benefits, indicating diminishing returns. GCC consistently outperformed MD in enhancing growth. Both materials effectively ameliorate acidic soils, with optimal application rates between 250g and 375g per pot. Further field trials are recommended to validate these results on a larger scale.
item: Conference-Full-text
Service process improvement through VSM of lean six sigma: a case study
(IEEE, 2025) Wickramasinghe, V; Illankoon, P
The paper presents a case study where value stream mapping (VSM) is applied to improve factory-floor employees’ performance management process (PMP) in the manufacturing context. The objectives were to 1) understand the PMP of the factory-floor employees, and 2) apply the VSM to improve their PMP. The present study a) identifies value from customers’ perspective, b) maps PMP along with its subprocesses, c) analyses waste with the intention of minimization, d) adopts a pull approach to fulfil customers’ demands, and e) proposes avenues for perfection. The study showed that notable efficiency improvements can be achieved even by SMEs from the application of VSM and DMAIC (define-measure-analyzeimprove-control).