Crew pairing is a sequence of flights beginning and ending at the same crewbase. Crew pairing planning is one of the primary processes in airline crew scheduling;it is also the primary cost-determining phase in airlin...Crew pairing is a sequence of flights beginning and ending at the same crewbase. Crew pairing planning is one of the primary processes in airline crew scheduling;it is also the primary cost-determining phase in airline crew scheduling. Optimizing crew pairings in an airline timetable helps minimize operational crew costs and maximize crew utilization. There are numerous restrictions that must be considered and just as many regulations that must be satisfied in crew pairing generation. The most important regulations—and the ones that make crew pairing planning a highly constrained optimization problem—are the the limits of the flight and the duty periods. Keeping these restrictions and regulations in mind, the main goal of the optimization is the generation of low cost sets of valid crew pairings which cover all flights in the airline’s timetable. For this research study, We examined studies about crew pairing optimization and used these previously existing methods of crew pairing to develop a new solution of the crew pairing problem using genetic algorithms. As part of the study we created a new genetic operator—called perturbation operator.Unlike traditional genetic algorithm implementations, this new perturbation operator provides much more stable results, an obvious increase in the convergence rate, and takes into account the existence of multiple crewbases.展开更多
Platform planning is one of the important problems in the command and control(C2) field. Hereto, we analyze the platform planning problem and present nonlinear optimal model aiming at maximizing the task completion qu...Platform planning is one of the important problems in the command and control(C2) field. Hereto, we analyze the platform planning problem and present nonlinear optimal model aiming at maximizing the task completion qualities. Firstly, we take into account the relation among tasks and build the single task nonlinear optimal model with a set of platform constraints. The Lagrange relaxation method and the pruning strategy are used to solve the model. Secondly, this paper presents optimization-based planning algorithms for efficiently allocating platforms to multiple tasks. To achieve the balance of the resource assignments among tasks, the m-best assignment algorithm and the pair-wise exchange(PWE)method are used to maximize multiple tasks completion qualities.Finally, a series of experiments are designed to verify the superiority and effectiveness of the proposed model and algorithms.展开更多
基于两个体比较的交互式遗传算法(Interactive Genetic Algorithm based on paired comparison,PC-IGA)允许用户在每次评估过程中比较两个个体并从中选择一个优胜者,以代替传统的用户评分方式,从而减轻用户的精神压力.但是,PC-IGA中用...基于两个体比较的交互式遗传算法(Interactive Genetic Algorithm based on paired comparison,PC-IGA)允许用户在每次评估过程中比较两个个体并从中选择一个优胜者,以代替传统的用户评分方式,从而减轻用户的精神压力.但是,PC-IGA中用户比较次数太多,加重了用户的生理疲劳.为此,本文提出一种新的用户评估方式——锦标赛选择,并给出锦标赛选择交互式遗传算法(Interactive Genetic Algorithm Based on Tournament Selection,TS-IGA)的关键技术和实现步骤.将该算法应用于服装色彩优化系统,研究了种群规模和子种群规模的选择对算法性能的影响.最后,将该算法与PC-IGA进行对比实验,结果表明本文提出的算法在选择合适的子种群规模的情况下,能有效减少用户的比较次数和算法收敛时间,从而减轻用户疲劳.展开更多
文摘Crew pairing is a sequence of flights beginning and ending at the same crewbase. Crew pairing planning is one of the primary processes in airline crew scheduling;it is also the primary cost-determining phase in airline crew scheduling. Optimizing crew pairings in an airline timetable helps minimize operational crew costs and maximize crew utilization. There are numerous restrictions that must be considered and just as many regulations that must be satisfied in crew pairing generation. The most important regulations—and the ones that make crew pairing planning a highly constrained optimization problem—are the the limits of the flight and the duty periods. Keeping these restrictions and regulations in mind, the main goal of the optimization is the generation of low cost sets of valid crew pairings which cover all flights in the airline’s timetable. For this research study, We examined studies about crew pairing optimization and used these previously existing methods of crew pairing to develop a new solution of the crew pairing problem using genetic algorithms. As part of the study we created a new genetic operator—called perturbation operator.Unlike traditional genetic algorithm implementations, this new perturbation operator provides much more stable results, an obvious increase in the convergence rate, and takes into account the existence of multiple crewbases.
基金supported by the National Natural Science Foundation of China(61573017 61703425)+2 种基金the Aeronautical Science Fund(20175796014)the Shaanxi Province Natural Science Foundation Research Project(2016JQ6062 2017JM6062)
文摘Platform planning is one of the important problems in the command and control(C2) field. Hereto, we analyze the platform planning problem and present nonlinear optimal model aiming at maximizing the task completion qualities. Firstly, we take into account the relation among tasks and build the single task nonlinear optimal model with a set of platform constraints. The Lagrange relaxation method and the pruning strategy are used to solve the model. Secondly, this paper presents optimization-based planning algorithms for efficiently allocating platforms to multiple tasks. To achieve the balance of the resource assignments among tasks, the m-best assignment algorithm and the pair-wise exchange(PWE)method are used to maximize multiple tasks completion qualities.Finally, a series of experiments are designed to verify the superiority and effectiveness of the proposed model and algorithms.
文摘基于两个体比较的交互式遗传算法(Interactive Genetic Algorithm based on paired comparison,PC-IGA)允许用户在每次评估过程中比较两个个体并从中选择一个优胜者,以代替传统的用户评分方式,从而减轻用户的精神压力.但是,PC-IGA中用户比较次数太多,加重了用户的生理疲劳.为此,本文提出一种新的用户评估方式——锦标赛选择,并给出锦标赛选择交互式遗传算法(Interactive Genetic Algorithm Based on Tournament Selection,TS-IGA)的关键技术和实现步骤.将该算法应用于服装色彩优化系统,研究了种群规模和子种群规模的选择对算法性能的影响.最后,将该算法与PC-IGA进行对比实验,结果表明本文提出的算法在选择合适的子种群规模的情况下,能有效减少用户的比较次数和算法收敛时间,从而减轻用户疲劳.
