| Citation: | XIA Hongqing, JIAO Jian, CHU Jiayun, et al. Improved GERT based time characteristic modeling and analysis method for task process[J]. Journal of Beijing University of Aeronautics and Astronautics, 2020, 46(11): 2140-2148. doi: 10.13700/j.bh.1001-5965.2019.0572(in Chinese)
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The characteristic of time is an important requirement for system tasks, especially in complex industrial systems. This paper adopts Graphical Evaluation and Review Technique (GERT) to build the stochastic network model of task flow. Considering the queued execution of activities caused by resource sharing and the overlapping of some upstream and downstream activities in tasks, the queuing theory and time factor are introduced to modify the execution time of each activity in the task, and the solution steps are given. The average execution time of the task increases by 22.9%; through uncertainty analysis, moreover, the key activities in the task are found out, which can provide direction and ideas for further task optimization. The landing task of carrier-based aircraft is taken as a case study to demonstrate the effectiveness and applicability of the proposed method.
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