Demand and Production Management with Uniform Guaranteed Lead Time

Recently, innovation‐oriented firms have been competing along dimensions other than price, lead time being one such dimension. Increasingly, customers are favoring lead time guarantees as a means to hedge supply chain risks. For a make‐to‐order environment, we explicitly model the impact of a lead time guarantee on customer demands and production planning. We study how a firm can integrate demand and production decisions to optimize expected profits by quoting a uniform guaranteed maximum lead time to all customers. Our analysis highlights the increasing importance of lead time for customers, as well as the tradeoffs in achieving a proper balance between revenue and cost drivers associated with lead‐time guarantees. We show that the optimal lead time has a closed‐form solution with a newsvendor‐like structure. We prove comparative statics results for the change in optimal lead time with changes in capacity and cost parameters and illustrate the insights using numerical experimentation.     

Evolution of Quality: First Fifty Issues of Production and Operations Management

Many contributions have been made to the field of quality since the inaugural issue of Production and Operations Management in 1992. The first issue called for more research and teaching on TQM, which resulted in two special issues dedicated to TQM. Many other articles related to quality have also been published in the first fifty issues of the journal on topics ranging from technical methods to the Baldrige Award and ISO 9000. As we review these articles, we assess their contribution and the progression of the field of quality. Although past research has advanced our understanding of quality, there still exists many research opportunities in developing more theory, using additional research methodologies, and studying emerging topics in this field.     

The Center Location Improvement Problem Under the Hamming Distance

In this paper, we consider the center location improvement problems under the sum-type and bottleneck-type Hamming distance. For the sum-type problem, we show that achieving an algorithm with a worst-case ratio of O(log |V|) is NP-hard, and for the bottleneck-type problem, we present a strongly polynomial algorithm.     

Clustering of Microarray data via Clique Partitioning

Microarrays are repositories of gene expression data that hold tremendous potential for new understanding, leading to advances in functional genomics and molecular biology. Cluster analysis (CA) is an early step in the exploration of such data that is useful for purposes of data reduction, exposing hidden patterns, and the generation of hypotheses regarding the relationship between genes and phenotypes. In this paper we present a new model for the clique partitioning problem and illustrate how it can be used to perform cluster analysis in this setting.     

信息可信与贷款利率确定问题的供应链鲁棒模型分析

提供真实可信的企业信息是企业申请银行贷款时的必要条件,但银行可以选择相信这些信息的部分或者全部,从而提供不同的利率水平。本文研究可信信息与银行贷款利率制定之间的关系以及相应决策对借款企业所在供应链的影响问题。通过构建银行参与的由供应商和零售商组成二级供应链模型刻画了零售商存在资金货款需求的供应链金融情景。针对银行采用零售商提供的全部信息或部分信息情况,从供应链管理视角考察了鲁棒的报童方法和极大极小方法分别获得了银行的最优利率决策及其对供应链运营所造成的影响。研究表明,银行采用部分信息并不能有效增加其收益,但其利率决策对供应链整体运作效率有非常显著的影响。     

生物药品制造行业竞争战略影响企业绩效的时滞效应研究——基于VAR模型的脉冲响应分析

本文利用中国医药生物制品上市公司2003年1季度-2012年1季度的季度财务数据进行了验证性因子分析,构建了差异化和低成本两个因子以反映公司的竞争战略。在此基础上,利用向量自回归(VAR)和脉冲响应的思路考察了战略制定及实施后企业的绩效表现,确定了战略绩效的滞后程度。研究发现:竞争战略影响企业绩效表现出一定的时滞效应;且差异化战略影响企业绩效的滞后期长于低成本战略;同时竞争战略影响企业绩效具有持续性,即竞争战略能够给企业带来持续的竞争优势,且差异化战略影响企业绩效的持续时间相比低成本战略也更长。最后,实证结果还发现,在医药生物制品行业,差异化战略相比低成本战略实施难度更大,风险更高,实施成功的可能性越小。     

政治关联、财务绩效与企业社会责任——来自中国化工行业上市公司的证据

以2007-2011年中国化工行业上市公司为样本,实证考察了政治关联、财务绩效和企业社会责任之间的关系。将政治关联划分为代表委员类和政府官员类两种类型。研究发现,不同类别的政治关联方式对企业社会责任的影响路径存在显著差异。具体表现为,高管的代表委员类政治关联正向作用于企业财务绩效,而财务绩效的提升会促使其更好地履行社会责任。而且,在控制了财务绩效的影响后,代表委员类政治关联对企业社会责任仍具有显著的正向影响,其政治关联的级别越高,企业的社会责任表现越好。这说明财务绩效在两者之间起着部分中介作用;然而,政府官员类政治关联会降低企业的财务绩效。在控制了财务绩效的影响后,其对企业社会责任的影响并不显著,表明了财务绩效在政府官员类政治关联和企业社会责任之间起着完全的中介作用。     

WM-FTBD配对交易建仓改进策略及沪深港实证检验

为研究建仓策略对配对交易年收益率影响,文章构建了折回首日WM-FTBD策略,结合GGR和Herlemont策略,在沪深港证券市场交易,运用三种检验方法,从理论和实证得出,FTBD策略成功率和年收益率都更高,同时发现深市年收益率呈离散、尖峰和正偏性,三种方法年收益率深圳最大,上海次之,香港最小且三者差异明显。结果表明,有效建仓策略可总体改进收益,但也承担更多风险,价差动量效应和均值回复效应有助于解释价差变化和收益率差异,配对交易在成熟有效市场不一定适合,但在发展中国家有着广阔的前景。     

耦合网络边相继故障模型研究

针对耦合网络上频发的相继故障问题,通过分析边级联故障蔓延的动力学演化机制,构建耦合网络上边相继故障模型。以提高耦合网络整体抵制相继故障能力为出发点,依据不同度量指标,多角度分析具有不同耦合模式的耦合网络鲁棒性与模型参数之间的关联性,研究耦合网络间耦合模式和网络基本模型等因素对相继故障的影响,探讨耦合网络边相继故障模型的整体保护策略。研究结果表明,同配连接模式能够增强耦合网络抵制级联故障的鲁棒性;相互依赖的两个耦合网络之间拓扑结构越相似,网络抵制相继故障的鲁棒性越强;耦合网络鲁棒性与网络平均度正相关;适当的增加耦合网络间对称边数量,能够有效提高网络的鲁棒性。最后,应用边相继故障模型在耦合电力网络上进行实例分析。