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RISS 인기검색어
- 검색키워드
- 저자 : Serdar Ulubeyli (검색결과 2 건)
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Construction Equipment Selection through Scenario-Based FDEA: Truck-Mixer Drums
Serdar Ulubeyli,Volkan Arslan,Ozer Uygun,Ismail Hakki Demir 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.8
This study aims to select the most suitable truck-mixer drum (TMD) for construction firms and to present a scenario-based approach to the construction equipment selection problem through the fuzzy data envelopment analysis (FDEA). The technical data of TMDs for quantitative criteria were initially obtained from three TMD companies operating in Turkey. A semi-structured questionnaire survey was then applied to 90 users (i.e., ready-mixed concrete companies) of these TMD brands for qualitative criteria. A scenario analysis, including four different scenarios, was lastly carried out by using FDEA. Considering each scenario, the best alternative was identified for TMD buyers. This study may be beneficial for researchers who can investigate (i) the decision-making process in the domain of the construction equipment selection and (ii) selection criteria of TMDs. This study may also help both potential buyers to make proper equipment selection decisions and TMD manufacturers to improve their products and competitiveness. In terms of originality, the study is first to focus on the selection process and criteria of TMDs. Similarly, FDEA was utilized for the first time in a construction equipment selection problem. As a limitation, the number of respondents, criteria, and alternatives might be increased to reveal more robust solutions.
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Economic Viability Analysis for Fresh Concrete Waste Reclaimers: The Capacity of Leftover Concrete
Aynur Kazaz,Serdar Ulubeyli,Murat Atici 대한토목학회 2018 KSCE Journal of Civil Engineering Vol.22 No.1
Many batching plants are reluctant in recycling the returned fresh concrete. However, leftover concrete may present great potential as it is always observed in truck-mixers. Therefore, viability of mechanical reclaimers was economically investigated considering the leftover concrete capacity. Toward this aim, availability of reclaimers in Turkey was revealed through a survey and the leftover concrete amount was measured. An economic selection algorithm for reclaimers was then introduced. Lastly, sensitivity and scenario analyses were performed for investment. In conclusion, most plants have poor views about recycling the leftover concrete although its percentage is 0.31%. With this amount, the annual leftover concrete amount in Turkey reaches a small plant’s annual production. Given viability, four inputs can have huge influence on viability and should be paid attention. Finally, the most likely and the best scenarios present an optimistic view even for small plants while the worst scenario has negative results and should be supported by incentives.
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