Reoptimization procedures in shortest path problem

In most algorithms for Transportation and Communication Models a sequence of Shortest Path Problems must be solved, where each problem is only slightly different from the preceding. Computational procedures are proposed to find the new shortest paths starting from the old shortest paths in two cases: i) the node from which the shortest paths are to be determined is changed; ii) the cost of one are is modified (either increased or decreased).This research was partially done while the author was visting the Centre de Recherche sur les Transports, Université de Montréal, with a financial support of the National Research Council of Italy.     

Mining frequent itemsets: a perspective from operations research

Mining frequent itemsets is a flourishing research area. Many papers on this topic have been published and even some contests have been held. Most papers focus on speed and introduce ad hoc algorithms and data structures. In this paper we put most of the algorithms in one framework, using classical Operations Research paradigms such as backtracking, depth‐first and breadth‐first search and branch‐and‐bound. Moreover, we present experimental results where the different algorithms are implemented under similar designs.     

力学反问题研究中的人工神经网络方法

随着力学学科的不断发展,力学反问题的神经网络方法研究越来越引起工程人员的重视。力学反问题的神经网络方法在工程实践中也得到了一定的应用。     

Has Management Studies Lost Its Way? Ideas for More Imaginative and Innovative Research

Despite the huge increase in the number of management articles published during the three last decades, there is a serious shortage of high‐impact research in management studies. We contend that a primary reason behind this paradoxical shortage is the near total dominance of incremental gap‐spotting research in management. This domination is even more paradoxical as it is well known that gap‐spotting rarely leads to influential theories. We identify three broad and interacting key drivers behind this double paradox: institutional conditions, professional norms, and researchers' identity constructions. We discuss how specific changes in these drivers can reduce the shortage of influential management theories. We also point to two methodologies that may encourage and facilitate more innovative and imaginative research and revisions of academic norms and identities.     

Strategic operations management decisions and professional performance in U.S. HMOs

Professional service organizations are becoming an increasingly important segment of the service sector in the U.S. but little attention has been paid to the management of these organizations, particularly in relation to technical performance. This paper reports the findings of a survey of managers of Health Maintenance Organizations (HMOs) which related operations management decisions about organization, workforce management, quality management and planning and control, to clinical process and outcome performance.This research demonstrates that managerial decisions do affect clinical performance in HMOs. These findings have implications for both researchers and practitioners. For researchers, the study provides a framework for future research on the important link between management decisions and technical performance in professional service organizations. For practitioners, this study suggests that technical performance will be enhanced when professional work is appropriately managed.     

电子商务网站的搜索引擎优化策略

搜索引擎优化,以其突出的优势正在渗透到网络的各个方面,成为网络营销的核心。本文分析了企业网站在搜索引擎优化上存在的问题,在此基础上提出电子商务网站的优化策略。     

探究航空装备保障人才培养中运筹学内容体系的构建与实践

通过梳理整合航空装备技术保障运筹问题,以问题为中心,构建凸显航空装备保障与管理特色的应用型教学体系。在此基础上采取"任务驱动式"程式组织教学内容,优化课程教学设计。     

Excel软件在物流运筹学教学中应用探究

物流运筹学的前身属于管理学的一个分支——管理科学,而它是高校物流管理专业的主干课程。物流运筹学是一门具有实际意义的课程,是运用系统优化的方法 ,通过建立数学模型来求解,通过合理的分析与运算,最后得出合理的决策,以达到高效率的配置人力、物力、财力等资源的目的。Excel在其计算中发挥着巨大的作用。文章通过实际的案例来导入,以期能帮助物流专业教师提供以Excel为工具解决物流运筹学的思路与方法,进而达到提高教学效率、实现教学效果的目的。     

Demand chain management: an integrative approach in automotive retailing

Recent reviews of the ‘operations management’ (OM) research literature have shown a surprising little shift towards empirical methodologies from traditional modelling solution methods. In addition, there is generally a lack of empirical testing and validation of manufacturing strategies. Coupled to this fact is that empirical work is rarely carried out in an inter-disciplinary manner, with the complete combination of OM, marketing, strategy, lean thinking and accounting approaches particularly poorly researched. Fully cross-functional integrative empirical research is required to help support the understanding of the applicability of OM practices within industry. This paper explores such an integration of approaches developed within the ‘lean thinking, strategic cost management, marketing and policy deployment areas’. In order to investigate the approach a single automotive retailer is used as an instrumental case. The results of the study show that the new approach stands up well as an integrative approach that can prove highly beneficial results. However, the pilot work also identified a number of limitations that are the basis of further refinement and testing of the method.     

Evaluating information diffusion speed and its determinants in social media networks during humanitarian crises

The rapid diffusion of information is critical to combat the extreme levels of uncertainty and complexity that surround disaster relief operations. As a means of gathering and sharing information, humanitarian organizations are becoming increasingly reliant on social media platforms based on the Internet. In this paper, we present a field study that examines how effectively information diffuses through social media networks embedded in these platforms. Using a large dataset from Twitter during Hurricane Sandy, we first applied Information Diffusion Theory to characterize diffusion rates. Then, we empirically examined the impact of key elements on information propagation rates on social media. Our results revealed that internal diffusion through social media networks advances at a significantly higher speed than information in these networks coming from external sources. This finding is important because it suggests that social media networks are effective at passing information along during humanitarian crises that require urgent information diffusion. Our results also indicate that dissemination rates depend on the influence of those who originate the information. Moreover, they suggest that information posted earlier during a disaster exhibits a significantly higher speed of diffusion than information that is introduced later during more eventful stages in the disaster. This is because, over time, participation in the diffusion of information declines as more and more communications compete for attention among users.     

Stable sets in matching problems with coalitional sovereignty and path dominance

We study von Neumann Morgenstern stable sets for one-to-one matching problems under the assumption of coalitional sovereignty (C), meaning that a deviating coalition of players does not have the power to arrange the matches of agents outside the coalition. We study both the case of pairwise and coalitional deviations. We argue further that dominance has to be replaced by path dominance (P) along the lines of van Deemen (1991) and Page and Wooders (2009). This results in the pairwise CP vNM set in the case of pairwise deviations and the CP vNM set in the case of coalitional deviations. We obtain a unique prediction for both types of stable sets: the set of matchings that belong to the core.     

Internationalization of R&D and Operations in Dominant Product U.S. Firms

Abstract

An empirical study of a sample of 38 U.S. dominant product firms operating in manufacturing industries was undertaken to trace the patterns of internationalization of R&D and operations. First, the results of our analysis revealed that internationalization of R&D and operations were a significant part of the evolving internationalization strategies of the dominant product firms we studied. Second, while internationalization of operations was influenced by international configuration via global standardization, the internationalization of R&D was influenced by international configuration via national responsiveness and by competitive positioning via differentiation. Third, the results highlight the fact that the internationalization moves of dominant product firms are not all similar, but depend on the international configuration and competitive positioning pursued by the firms.     

基于多维权有向图的多式联运中运输方式的选择研究

建立了以运输费用、运输能力及运输时间三者为基础的模型，同时结合多维权有向图理论对其进行求解，并对其进行了实证分析。     

工程施工网络计划中工期-成本优化方案

运用图论方法和计算机技术，根据网络图，建立数学模型，通过对各子项目工期的调整，实现工期一成本的最优化。特别对大中型工程，较传统手工方法，具有明显的优越性，有助于加快计算机辅助工程资源管理的进程，使得网络电算应用成为可能。     

浅谈网络信息挖掘中搜索引擎的应用

随着计算机技术和互联网技术的飞速发展,越来越丰富的信息呈现在用户面前,但同时伴随的问题是用户越来越难以获得其最需要的信息。搜索引擎技术解决了用户检索网络信息的困难,目前搜索引擎技术正成为计算机科学界和信息产业界争相研究、开发的对象。文章旨在探讨搜索引擎技术在网络信息挖掘方面的应用,并以著名的搜索引擎百度为例,具体分析其过程,总结分析网络信息挖掘技术在搜索引擎中的应用前景。     

创新型人才培养中教学与科研工作实践

本文从教学与科研实践出发,讨论了如何结合教学和科研工作开展创新型人才培养;结合作者的管理教学与科研工作实践,分别就专业教师队伍创新能力的构建,研究项目引导的学生主动创新教育和教科研项目向学生实践项目转化等方面进行了详细的论述,为创新型人才培养模式的发展提供了有益的参考。     

基于约束理论和网络计划的生产物流研究及实证

运用约束理论来考察生产物流对企业实际产品生产的影响,将生产物流假定为影响企业高效运作的制约环节,再运用网络计划方法,分析并选定生产企业产品制造的关键工艺流程路线,为企业找出生产物流中的制约因素。以金秋农药有限公司为例进行实证分析,以期为制造企业的生产物流合理化提供一个具有普遍意义的研究方法。     

The estimates of philanthropic behavior and attitude in South Korea: Methodological consideration

Estimates on philanthropic giving are one of the major topics within nonprofit studies globally. South Korea has engaged in measuring philanthropic behaviors and attitudes since the early 2000s, however, little is known about the validity of the measures that are used to collect giving and volunteering data. This study aims to investigate the methodological matters of the empirical philanthropy datasets in South Korea. A total of nine datasets were identified that measure philanthropic behaviors and attitudes in South Korea. Among the nine datasets, six were used to analyze the methodological matters for the purposes of this study. This article discusses the challenges associated with research methods including definitional challenges, instrument design issues, and other research methodological issues on the identified philanthropic giving datasets in South Korea. Results of this study suggest insights for improving measures of charitable giving and volunteering in South Korea. The findings are significant because differences in approaches to measuring donation behavior produce substantial differences in reported estimates.     

博客营销在企业网络营销中的作用管窥

互联网的迅猛发展给博客(BLOG)提供了一个迅速成长的成熟环境。而企业在网络营销业务中的博客营销则是一种基于包括思想、体验等表现形式的个人知识资源及它的网络信息传递形式。这种网络营销工具已在企业网络营销业务中起到越来越大的作用。