共查询到20条相似文献,搜索用时 15 毫秒
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Guowei Hua T.C.E. Cheng Shouyang Wang 《International Journal of Production Economics》2011,131(2):568-574
This paper considers the problem of siting p new facilities of an entering firm to a competitive market so as to maximize the market share captured from competitors per unit cost. We first formulate the problem as a mixed 0-1 fractional programming model, in which we incorporate the fixed cost and transportation cost. The model can deal with the case where some demand nodes have two or more possible closest servers. We then re-formulate the problem as a 0-1 mixed integer linear program. We use a one-opt heuristic algorithm based on the Teitz-Bart method to obtain feasible solutions and compare them with the optimal solutions obtained by a branch-and-bound algorithm. We conduct computational experiments to evaluate the two algorithms. The results show that both algorithms can solve the model efficiently and the model is integer-friendly. We discuss other computational results and provide managerial insights. 相似文献
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Advertising is very important for the newsboy problem because the shelf-life of the newsboy product is short and advertising may increase sales to avoid overstocking. In this paper, models to study the effect of advertising are developed for the distribution-free newsboy problem where only the mean and variance of the demand are known. As in Khouja and Robbins (2003), it is assumed that the mean demand is an increasing and concave function of advertising expenditure. Three cases are considered: (1) demand has constant variance, (2) demand has constant coefficient of variation, and (3) demand has an increasing coefficient of variation. This paper provides closed-form solutions or steps to solve the problem. Numerical results of the model are also compared with those from other papers. The effects of model parameters on optimal expenditure on advertising, optimal order quantity, and the lower bound on expected profit are derived or discussed. 相似文献
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The joint economic lot size problem: A review 总被引:1,自引:0,他引:1
Christoph H. Glock 《International Journal of Production Economics》2012,135(2):671-686
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当前煤炭资源开发中存在的问题与建议 总被引:4,自引:0,他引:4
1,煤炭资源缺乏统筹规划和合理配置。目前我国煤炭生产结构不合理,小煤矿点多面广,资源占有量大。由于多数小煤矿矿井装备简陋,布局不合理,开采技术水平落后,资源回收率低下,甚至存在乱采滥挖现象,造成资源浪费严重。 相似文献
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城市房屋拆迁存在的问题与对策 总被引:3,自引:0,他引:3
为适应我国市场经济的发展和住房制度改革的深化,我国从2001年11月1日起实施修订的“城市房屋拆迁管理条例”,一年多来取得了明显成效,但尚存一些问题。本重点论述存在的问题,并提出解决问题的对策 相似文献
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This paper continues the analysis of a special uncapacitated single item lot sizing problem where a minimum order quantity restriction, instead of the setup cost, guarantees a certain level of production lots. A detailed analysis of the model and an investigation of the particularities of the cumulative demand structure allow us to develop a solution algorithm based on the concept of atomic sub-problems. We present an optimal solution to an atomic sub-problem in an explicit form and prove that it serves as a construction block for the optimal solution of the original problem. Computational tests and a comparison with a published algorithm confirm the efficiency of the solution algorithm developed here. 相似文献
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International Journal of Technology and Design Education - 相似文献
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目的 探讨我国医药企业应急管理体系存在的问题和对策.方法 针对目前企业建立应急管理面临的问题,结合加拿大对企业的应急管理建设指南,提出对解决方法的思考.结果 解决的对策有:国家进一步完善体制;医药企业建立应急体系;政府提供企业技术支持等.结论 医药企业应肩负其社会责任,应尽快建立应急管理体系. 相似文献
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Houcai Shen Zhan Pang T.C.E. Cheng 《International Journal of Production Economics》2011,132(1):146-153
This paper studies the purchasing behaviour of a loss-averse engineer-to-order manufacturer, who purchases a key component for his final product from a supplier under a single-wholesale-price contract with spot purchase opportunities, where both the product demand and the component spot price are uncertain. Through newsvendor type of models, we analyze several key issues, including the effects of the manufacturer's loss aversion, and the effects of demand and spot price uncertainties on the manufacturer's decision behaviour. We find that the purchasing behaviour of the loss-averse manufacturer differs from those of the risk-neutral and risk-averse ones. Specifically, we identify some sufficient conditions under which the loss-averse manufacturer may purchase a larger order quantity in advance when demand becomes more uncertain or when the price becomes more uncertain. We also discuss the two-wholesale-price contract and show that fixing the emergency supply price may lead to a smaller order quantity. 相似文献