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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    PublicationOpen Access
    Critical Supply Chain Problems In Contractor - Subcontractor Interface Of Sri Lankan Building Construction Projects
    (SLIIT, 2022-02-11) De Silva, P; Panagodage, T. L
    As a developing country, construction industry provides considerable contribution to the Socioeconomic growth of Sri Lanka. However, successful completion of a construction project is yet a challenging task. It requires coordination, collaboration and management of different stakeholders with different objectives. While achieving the objectives of a construction project, a proper management of supply chain is vital as improper management of the supply chain impacts negatively on the construction project delivery process. Prior studies have identified several interfaces which impact on the successful project delivery. The mechanism related to contractor-subcontractor interface highly impacts the ultimate project outcome as it is directly linked with the delivery of the project. This study set out to identify the critical supply chain problems in contractor-subcontractor interface in Sri Lankan building construction projects. The study was derived through a mix method approach. Semi structured interviews were carried out among the industry expertise to identify the supply chain related problems. Thereafter, to identify the critical problems of supply chain, a questionnaire survey was carried out among the industry practitioners in the building construction projects. The data was analyzed using Relative Important Index in order to rank and identify the severity of each identified problem in the contractor – subcontractor interface. The study indicates that, using verbal information, lack of reference to the main contract and nonresponsible responses as the critical problems in the Information flow. In terms of the Material flow: deliveries are not according to the plan, poor labour management and noncompliance with material and components are ranked as the critical problems. Delay in payments, back-to-back payments and payment interest charging as the critical problems under the Capital flow. These findings may assist the industry practitioners to identify the criticality and monitor supply chain problems in contractor- subcontractor interface and to minimize them in building construction projects.
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    PublicationEmbargo
    Quantification of machine effectiveness in building and construction industry
    (IEEE, 2018-02-08) Weerasinghe, H. M; De Silva, D. H
    Building and Construction industry highly depends on different kinds of heavy machines and machinery vehicles when it comes to performing different construction tasks. Since the current industry is not heavily concerned about measuring the effectiveness of machines, a considerable amount of budget is wasted due to the misuse of machines. Hence, there should be a proper method to monitor their effectiveness and to eradicate their misuse. Effectiveness can be achieved by analyzing the matrices, Availability, Performance, and Quality. Availability measurements can be acquired by analyzing the machine's on/off times and also the idle times, and by introducing a GPS and sensor equipped tracking device, the availability of machines can be tracked. The device is capable of acquiring the geographical location and the on/off state of the machine. Performance can be acquired by analyzing the task and the details of the machine. Excavating, Digging, Scraping, Spreading, and Loading are some of the construction activities and different machines are used for different purposes. This paper reports on a reliable way of calculating the performance by using specially designed algorithms for each type of machine. The algorithm uses a data driven questionnaire for each and every machinery vehicle to evaluate the quality factor. Each question has a weightage value where questions can be rated based on the value. By analyzing and calculating the outputs of availability, performance and quality factors, the system is able to calculate the effectiveness of the machine.