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نتیجه جستجو - Discrete symbiotic organisms search

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1 Discrete symbiotic organisms search method for solving large-scale time-cost trade-off problem in construction scheduling
روش جستجوی ارگانیسم های همزیستی گسسته برای حل مسئله تجارت هزینه زمان در مقیاس بزرگ زمانبندی ساخت-2020
Construction projects are becoming increasingly larger and more complex in terms of size and cost. An optimization tool is necessary for the construction management system to develop the desired construc- tion schedule to save time and cost. However, only a few effort s have been made to deal with the time-cost trade-offproblem (TCTP) in the large-scale construction projects, and the existing optimiza- tion methods are slightly limited by the trouble of parameter tuning. As TCTP is known to be an NP-hard problem, this paper aims to introduce a new variant of Symbiotic Organisms Search (SOS) algorithm that does not contain control parameters, called DSOS (Discrete Symbiotic Organisms Search) which gener- ates the parasite organism using a heuristic rule based on the network levels. This enhancement helps to improve the exploration phase and avoid premature stagnation. Performances are evaluated on project instances with different numbers of activities varying from 180 to 6300, as well as nine newly gener- ated project instances with 720 activities but different network structures. The obtained results show a good performance of DSOS in terms of robustness and deviation from optimum in comparison with other meta-heuristics and variants of DSOS without using the heuristic rule. The good performance implies that DSOS is sufficient to serve as an effective tool to generate an optimized construction schedule.
Keywords: Large-scale construction project | Deadline constraint | Time-cost trade-off | Discrete symbiotic organisms search
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