Optimization for Vehicle Routing Problem with Cross-docking considering the Value of Time Window Service

The cross-docking distribution network has the characteristics of low storage and high efficiency, and the key to its implementation is the effective integration of internal coordination, sorting and external vehicle routing. Meanwhile, the complexity of the distribution environment increases the uncertainty of delivery time, making logistics service recipients perceive different service value. Combined with the prospect theory, the customer time window service value function is given. And a multi-objective optimization model for cross-docking logistics distribution aimed to find the lowest total cost and the largest value of time window service is proposed. Then, a hybrid algorithm combining tabu search algorithm and local search algorithm is designed to find the optimal solution. Finally, the simulation of the example verify the feasibility and effectiveness of the model and the algorithm.     

理想点法在证券投资组合中的应用

本文将理想点法应用于证券投资组合的求解,基本思想是分别求解投资组合问题关于期望收益最大化、方差风险最小化以及期望效用最大化三个单目标问题的最优解,再通过构造评价函数求解目标问题的满意解.理论分析和实例计算均说明本文提出的方法有较好的可操作性.     

On the design of optimal change-over experiments through multi-objective simulated annealing

The construction of optimal designs for change-over experiments requires consideration of the two component treatment designs: one for the direct treatments and the other for the residual (carry-over) treatments. A multi-objective approach is introduced using simulated annealing, which simultaneously optimises each of the component treatment designs to produce a set of dominant designs in one run of the algorithm. The algorithm is used to demonstrate that a wide variety of change-over designs can be generated quickly on a desk top computer. These are generally better than those previously recorded in the literature.     

初始排污权分配的一个多目标决策模型

实施初始排污权交易制度,在理论和实践中首先要解决的一个关键问题是初始排污权的分配问题。关于初始排污权的分配问题,美国国会在《清洁空气法》中提出了三类分配方式:即免费分配、公开拍卖和标价出售。当公开拍卖和标价出售这种有偿分配方式在实践中遇到阻力的情况下,学术探讨和实践中均认为初始排污权实行免费分配更具有可操作性。但有多种依据可作为初始排污权免费分配的基础,而各种依据又都具有其公平合理和欠合理的特征。本文基于经济最优性、公平性和生产连续性原则,构建了初始排污权免费分配的一个多目标决策模型,并对该模型的有关性质进行了讨论。