遗传算法在WMS货位优化分配中的应用

从一汽轿车股份有限公司仓储中心WMS的实际业务出发,考虑物料的进出库频率和货架的受力情况,为货位分配问题建立多目标优化模型.利用遗传算法中的并列选择法,设计遗传算子并进行求解.优化后结果表明:可以减少堆垛机的运行距离,合理安排货物的分配,减少人工作业,提高仓储的利用效率,降低企业成本.     

Spatial hidden Markov models and species distributions

A spatial hidden Markov model (SHMM) is introduced to analyse the distribution of a species on an atlas, taking into account that false observations and false non-detections of the species can occur during the survey, blurring the true map of presence and absence of the species. The reconstruction of the true map is tackled as the restoration of a degraded pixel image, where the true map is an autologistic model, hidden behind the observed map, whose normalizing constant is efficiently computed by simulating an auxiliary map. The distribution of the species is explained under the Bayesian paradigm and Markov chain Monte Carlo (MCMC) algorithms are developed. We are interested in the spatial distribution of the bird species Greywing Francolin in the south of Africa. Many climatic and land-use explanatory variables are also available: they are included in the SHMM and a subset of them is selected by the mutation operators within the MCMC algorithm.     

A genetic algorithm for assembly line balancing

Assembly line balancing is a very important aspect in any mass production setup. However, finding the optimal balance is a very difficult proposition because of the computational complexity involved. Hence sub-optimal solutions are preferred over optimal solutions. In this work, a genetic algorithm (GA) is presented for obtaining good quality solutions for assembly line balancing problems. A major feature of GA is the ability to take care of a variety of objective functions. A modified GA working with two populations, one of which allows infeasible solutions, and exchange of specimens at regular intervals is proposed for handling irregular search spaces. The experimental results obtained with a single population, as well as two populations are encouraging.     

一类多元Bernstein算子的加权逼近

主要讨论了一类二元的Bernstein算子的加权逼近问题。首先，我们举例说明在通常的加权范数下它是无界的。然后我们给出了一类新的加权范数，在此范数下它是有界的。最后我们利用一类新的加权K一泛函给出了二元Bernstein算子加Jacobi权逼近的特征刻划。     

Labor Supply by Farm Operators Under “Decoupled” Farm Program Payments

As part of 1996 legislation, the U.S. began paying farmers production flexibility contract payments designed to be somewhat decoupled from current production decisions. In the labor-leisure model, decoupled payments would be expected to only have a wealth effect, but coupled payments would be expected to have both a substitution and a wealth effect. In this paper, the impacts of the decoupled payments and other government payments on both farm and off-farm labor allocations for farm operators are considered using data from the Agricultural Resource Management Survey (ARMS). Results indicate that government payments tend to increase the hours operators work on their farm and decrease the hours they work off the farm. This is true whether the payments come from programs which tie payments to current year production, or not.JEL Classification: D13, J22, Q12, Q22The authors are agricultural economists with the Economic Research Service (USDA). The views expressed here do not necessarily represent the views of the U.S. Department of Agriculture.     

Theoretical L-moments and TL-moments using combinatorial identities and finite operators

Moments have been traditionally used to characterize a probability distribution. Recently, linear moments (L-moments) and trimmed L-moments (TL-moments) are appealing alternatives to the conventional moments. This paper focuses on the computation of theoretical L-moments and TL-moments and emphasizes the use of combinatorial identities. We are able to derive new closed-form formulas of L-moments and TL-moments for continuous probability distributions. Finally, closed-form formulas for the L-moments for the exponential distribution and the uniform distribution are also obtained.     

关于多元指数型算子的一致逼近(Ⅱ)

设L_(n,m) (F (u,v);x,y)是二元指数型算子,在本文中,我们借助于K-泛函,讨论了当0相似文献   

电信运营商信誉对消费者移动支付的分析

为了深入了解电信运营商信誉对消费者移动支付使用意愿的作用机制,运用重复博弈对电信运营商信誉作为消费者使用意愿影响因素的原因进行分析,并从使用意愿形成的心理阶段对原因进行解释,进而提出电信运营商提升运营移动支付业务信誉的策略。     

关于多元Beta算子的L_P逼近

本文主要给出了一类多元Beta算子在L_p逼近下的特征刻划和加Jacobi权逼近时的特征刻划。     

双光子Jaynes—Cummings模型态的演化

用两个量子态的密度算符之间的距离并给合Von Neumann熵研究了在初始相干光场很强的条件下双光子Jaynes-Cummings模型(JCM)态的演化规律。