Browsing by Author "Siriwardena, S"

Now showing 1 - 4 of 4

item: Conference-Abstract
Analysis of optimal expansion level of a single runway airport
(Department of Civil Engineering, University of Moratuwa, 2022-12) Siriwardena, S; Perera, L; Perera, HLK
Air travel is rapidly increasing all over the world, and airport capacities are crucial when serving this growing demand. When it comes to airport capacity, whether it is passenger or freight, runway capacity is the key determining factor among many others. At the same time, adding a runway to existing airports is an expensive process, from the design itself to obtaining approvals, construction, and completion, compared to any other developments associated with an airport, such as passenger areas and other service areas. However, despite the cost and other negative external factors involved, most airport authorities tend to make a bold decision to add another runway to the existing Airport without looking at optimizing existing and future operations. This appears to be the case for Bandaranaike International Airport (BIA), which made plans to build a second new runway to accommodate future traffic. Therefore, the main aim of this research is to identify how to achieve the optimal expansion of a single-runway airport without adding a second runway. This is achieved by identifying critical parameters that affect runway capacity and analyzing ways to obtain the optimal capacity. Hence, the next appropriate solution to accommodate future traffic growth is to optimize current operations rather than physical expansion due to drawbacks such as high capital costs, long implementation times, community opposition, and so on. After collecting the necessary data, an analysis was carried out to determine the current capacity and the utilization of the runway at BIA. From the analysis, it was found that during a peak period, more than 50% of runway capacity is idle, meaning that it's been underutilized heavily at present. In other words, BIA can simply double the operations with the existing runway, and now the question is whether BIA expects a growth rate greater than this within the next 15-20 years. There are ways to optimize runaway capacities in addition to determining the truly available runaway capacity. One such option would be to assist air crafts in evacuating from the runaway in the shortest possible time without any hindrance to RADAR and wake turbulence separations so that they can conduct the next operations. This was found to be the next largest bottleneck hindering runaway capacity, and as a result, the implementation of high-speed exits has been considered in this study using the REDIM software. In addition, the best departure and arrival sequences were discovered using Python code to utilize the time more efficiently, as runway occupancy time (ROT) differs according to the aircraft category. It can be concluded that the existing runway capacity could be further improved by optimizing the current operations, as ROT was reduced by 10%. ROT reduction leads to a reduction in costs and delays, which would make a significant difference during peak hours. As the world's busiest Airport that operates with a single runway, Mumbai airport handles aircraft at 65-second intervals, and it's important that optimization strategies are implemented at such airports to avoid significant delays.
item: Conference-Full-text
Analysis of the factors affecting to logistics service quality based on unaccompanied passenger baggage warehouses in sri lanka
(Sri Lanka Society of Transport and Logistics, 2023-08) Mathugamage, N; Siriwardena, S; Gunaruwan, TL
This study underscores Logistics Services’ essential role in cross-border trade, with warehousing as a key link in product flows. Its primary goal is identifying factors impacting Logistics Service Quality (LSQ) in UPB bonded warehouses in Sri Lanka. Additionally, it addresses challenges for UPB consignees and suggests LSQ improvement strategies. Using a deductive approach and quantitative research, the study employs online questionnaires for data collection from 390 customs bonded UPB consignees. LSQ dimensions align with warehouse performance, with Timeliness, Information Quality, Personnel Quality, and Physical Service identified as pivotal LSQ influencers. Descriptive and inferential analyses validate these factors’ positive effects on LSQ. The study delves into industry challenges, proposing strategies to enhance UPB operational efficiency. It emphasizes stakeholders’ role in embracing change, pursuing excellence, and achieving competitive advantage for sustainable growth.
item: Thesis-Full-text
Efficiency study of a single day smoke dryer
Rathnayake, WGIU; Siriwardena, S; Walpalage, S
The energy utilization and the time required to dry RSS using conventional type smoke house are significantly high. Also the conventional type smoking-room used for producing RSS gives large differences oftemperature and velocity; these result in non-uniform drying of the rubber sheets. In a conventional smokehouse, the energy losses due to loading and unloading of the sheets as well as time required for complete dryness is very much high.A Compact. well insulated drying unit with multipurpose gravel layer was designed and fabricated new operational practices for efficient energy utilization of Ribbed Smoke Sheet (RSS) Drying were also introduced. The overall drying performance was evaluated in term of drying efficiency and firewood consumption. Quality of the end product was also evaluated. A comparison also made against the performance of conventional smoke house. Social issues also compared with conventional system. The nevv system reduces the drying period from 5 days to one day. while space requirement also reduce by the same percentage when comparing with the conventional smoke house.No Significant difference of the quality of sheets dried using SS drying system against sheets dried in conventional smoke house was observed. However, dirt content in the sheets dried in the new system is lower tan that dried in a conventional system. The Single day Smoke dryer (SS dryer) has the efficiency of 51.7%. it is a very good value compared with a conventional smoke dryer which has the efficiency of 31%. The most interested feature of the SS dryer is the low space utilization compared with the conventional type smoke house and also the time requirement for t~1brication of the SS dryer is very short. In addition to the above advantages. the dryer can be operated by one person and the health issues arc very limited to compare with the conventional smokehouse.
item: Conference-Full-text
Identify the causes for the rejection of public transport service in Gampaha district: a study on the level of perception of private vehicle users
(Sri Lanka Society of Transport and Logistics, 2023-08-26) Gamalath, GAUV; Siriwardena, S; Gunaruwan, TL
People frequently use private vehicles because they are dissatisfied with the services provided by public transportation in various regions of the world. Understanding the satisfaction of regular private vehicle users is critical if we are to understand their needs and preferences for public transportation and encourage them to make the modal switch. As the main objective the study aims to identify the causes for the rejection of public transport services in Gampaha district based on the level of perception of private vehicle users. Based on these objectives, and using the SERVQUAL model, the independent variables are identified as rejection causes following quality and demographic attributes and the dependent variable is the rejection of PT by private vehicle users. The research is followed by the quantitative approach and convenient sampling method where the data collection involved 389 respondents. The primary research objective is attained through data analysis by identifying and statistically proving the service quality attribute and demographic characteristics-based elements that influence PT rejection. And it has been statistically proven that each of these criteria contributes separately and positively to explaining the total rejection. Deeper into the study, present challenges in the PT system, strategies to persuade PV users to switch modes, and recommendations to improve PT performance are explained.