Coordinating production and recycling decisions with stochastic demand and return

In this paper, the joint production and recycling problem is investigated for a hybrid manufacturing and remanufacturing system where brand-new products are produced in the manufacturing plant and recycled products are remanufactured into as-new products in the remanufacturing facility. Both the brand-new products and remanufactured products are used to satisfy customer demands. Returns of used products that are recycled from customers are assumed to be stochastic and nonlinearly price-dependent. A mathematical model is proposed to maximize the overall profit of the system through simultaneously optimizing the production and recycling decisions, subject to two capacity constraints — the manufacturing capacity and the remanufacturing capacity. Based on Lagrangian relaxation method, subgradient algorithm and heuristic algorithm, a solution approach is developed to solve the problem. A representative example is presented to illustrate the system, and managerial analysis indicates that the uncertainties in demand and return have much influence on the production and recycling policy. In addition, twenty randomly produced examples are solved, and computational results show that the solution approach can obtain very good solutions for all examples in reasonable time.     

全方位获取学科信息需求的探讨与实践

全面调研学科信息需求是开展学科服务的前提和基础。以安徽医科大学重点学科为例,结合问卷调查和已发论文的统计分析,提出了一种较为全面地了解学科信息需求的方法。     

新农村建设中安徽省农村信息需求分析

农村信息需求分析是农村信息化建设的重要组成部分。基于对安徽省部分地区的调研,阐述了农民信息需求的内容,分析了新农村建设中信息需求现状,并提出了合理化的改进措施。     

武器装备采办分层次竞争机制研究

武器装备的供给应着力于构建"寡头主导、大中小企业分层竞争"的产业组织结构。采办方应设计最优的主承包招标机制,以促进各寡头企业之间的投标竞争,从而实现最佳采办效益。武器装备采办的分层次竞争不完全取决于采办方的竞争意愿,其还要受到武器装备供给企业的产权安排、军民融合程度、纵向一体化及采办代理人制度等多种因素的影响。     

一类商品价格供需系统的稳定性分析

运用动力系统稳定性理论,建立了一类具有时滞脉冲的商品价格供需系统,讨论了一类商品价格供需系统的稳定性问题.给出了系统在时滞脉冲下零解渐近稳定的条件,分析系统参数、脉冲和时滞量之间的相对关系对系统的影响,发现在一定条件下商品市场的价格调节机制是可行的,能够保证市场商品价格的稳定,但价格这种调节机制是有限的,一旦超出这个范围,就会出现市场商品价格的不稳定.最后进行数值仿真,验证了时滞脉冲稳定的有效性,并给出了经济学解释.     

浅析高校国防教育

高校国防教育旨在使在校大学生深刻认识国防建设与国家安危、民族兴亡的密切关系,增强国防观念和国家安全意识,正确认识新一代大学生所担负的历史责任。做好国防教育具有重要意义。本文将结合作者的理解,浅析高校国防教育,为更好的开展国防教育,提升大学生对于中国国情的认识,加强爱国主义教育提供有益借鉴。     

基于出行需求的公交巴士服务构建初探

基于出行需求的交通服务(DRT,Demand Responsive Transport)就出行者的需求可以迅速地提供相应的出行服务,同时在应对个性化出行需求方面比常规公共交通方式更具时间和空间上的灵活性.作为近年来客运交通领域的一次革新,在欧美发达国家已经得到了较为广泛的应用.立足于DRT的基本理论,探索了DRT模式下...     

生鲜食品多阶段动态定价模型及算法

考虑消费者购买行为,建立生鲜食品多阶段动态定价模型,力图使零售价格能够动态地反映生鲜食品的价值波动,采用基于正负反馈机制的改进蚁群算法求解模型。通过不同算例仿真分析,表明该模型优于传统模型;同时将本文算法与其他3种算法进行对比,从收敛性能和运行时间方面证实本文算法更优。     

层次需求理论视角下特奥会参赛者服务需求的研究——以全国第五届特奥会为例

基于层次需求理论,采用问卷调查法、数理统计法等方法,对《特奥会参赛者服务需求量表》进行编制,并对全国第五届特奥会参赛者的服务需求进行实证研究.结果表明：参赛者的服务需求主要包括情感、生理、安全、尊重服务需求;不同项群参赛者的服务需求存在显著性差异,且情感服务需求最高;不同赛段参赛者的服务需求存在显著性差异.     

A closed-loop Supply Chain Network Equilibrium Model with Fuzzy Demand under Production Capacity Constraints and Price Rigidities

A closed-loop supply chain network equilibrium problem is examined,which consists of mutual competitive manufacturers with production capacity constraints and retailers with fuzzy market demands,mutual competitive collectors as well as a binding price ceiling of the commodities.By utilizing the credibility measure of fuzzy event,variational inequality and Lagrange dual theory,the optimum behaviors of manufactures,retailers,collectors and consumers are described.Therefore,the supply chain network equilibrium model is established.Numerical examples were given to illustrate the impact of production capacity constraints and price ceiling on the network equilibrium pattern.The results show that the shortage of commodities in consumer market will be more serious,the wholesale price of product and purchase price of waste products rise,the profits of retailers decrease,the profits of manufacturers and collectors increase as the government gradually reduce the binding price ceiling on competitive markets,and the trend will be more obvious in the existence of production capacity constraints at same time.