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The First International Conference on Uncertainty Theory

作者： Hua Ke Weimin Ma School of Economics and Management Tongji University Shanghai 200092 China

＜正＞The time-cost trade-off problem studies how to modify project activities to achieve the trade-off between the completion time and the total project *** real world,the trade-off between the total project cost and the completion time,and the uncertainty of the external environment are both considerable for *** this paper,a new fuzzy random time-cost trade-off model is proposed,in which the philosophy of chance-constrained programming is introduced as decision-making *** approach by integrating fuzzy random simulation and genetic algorithm is produced to search the quasi-optimal *** the whole,this paper is to illustrate the process of achieving the optimal balance of the completion time and the project total cost in mixed uncertain environment with randomness and fuzziness.

关键词： time-cost trade-off Fuzzy random simulation Chance-constrained programming Genetic algorithm

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Research on the fully fuzzy time-cost trade-off based on genetic algorithms

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Journal of Marine Science and Application 2005年第3期4卷 18-23页

作者： JIN Chao-guang JI Zhuo-shang LIN Yan ZHAO Yuan-min HUANG Zhen-dong Ship CAD Engineering Center Dalian University of Technology Dalian 116025 China Dalian Shipyard Co. Ltd. Dalian 116005 China

It is very difficult to estimate exact values of time and cost of an activity in project scheduling process because many uncertain factors, such as weather, productivity level, human factors etc. , dynamically affect them during project implementation process. A GAs-based fully fuzzy optimal time-cost trade-off model is presented based on fuzzy sets and genetic algorithms (GAs). In tihs model all parameters and variables are characteristics by fuzzy numbers. And then GAs is adopted to search for the optimal solution to this model. The method solves the time-cost trade-off problems under an uncertain environment and is proved practicable through a giving example in ship building scheduling.

关键词： fuzzy sets ranking fuzzy number genetic algorithms time-cost trade-off

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A Stochastic Chance-Constrained Programming Model for time-cost trade-off Problem

A Stochastic Chance-Constrained Programming Model for Time-C...

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第七届中国不确定系统年会

作者： Hua Ke,Weimin Ma School of Economics and Management,Tongji University,Shanghai 200092,China

＜正＞In real projects,both the trade-off between the project cost and the project completion time,and the uncertainty of the environment are considerable for *** the existing models for the stochastic time-cost trade-off problem,optimizing the expected value of the objective is the exclusive decision-making *** this paper,an alternative stochastic model is proposed,in which the philosophy of chance-constrained programming is adopted for decision *** addition,stochastic simulation and genetic algorithm are integrated to design a hybrid intelligent algorithm to search the quasi-optimal schedule.

关键词： time-cost trade-off Chance-constrained programming Genetic algorithm

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