基于动态事件调度仿真的高速铁路动车组运用计划计算机协同编制方法的研究

依据动车组运用的牵引动力与载客装置不可分离的原则,动车组挂运接续和列车运行线的时点是一致的,因此将这些时点作为变量,考虑动车组整备维修、动车组站段折返接续作业时间、列车运行线铺画约束、列车挂运匹配等条件,建立以动车组运用效率和列车运行计划均衡性为指标的基本模型,采用动态事件表调度方法实现可行方案编制,研究站间固定区段运用模式下,单基地多车种的动车组运用计划与成对列车运行计划协同编制问题。最后以京津客运专线实际条件模拟编制动车运用计划,以验证模型与算法的可行性。     

Selecting make-to-stock and postponement policies for different products in a chemical plant: A case study using discrete event simulation

We present a guideline for selecting the inventory management policy for a specialty chemical plant that produces products with limited shelf life, by producing multiple grades of bulk chemical and packaging them into a large variety of bottles. The policy for each product was selected based on a cost-benefit analysis, using the multiple objectives of maximizing the on time order fulfillment, minimizing the production (cleaning and shelf life expiration) and inventory costs. To generate realistic cost estimates, we developed a discrete event simulation model that included demand variability, planning and scheduling policies, and operational details. We evaluated three different policies: make-to-stock (MTS), postponement, and combined MTS/postponement. We also evaluated different storage media and optimized the number of storage units for products selected for postponement. A combined MTS/postponement policy, in which postponement is applied to products with low to medium demand and high expiration provided lowest costs without significantly impacting the customer on time order fulfillment. For all other products, a MTS policy is applied to maximize order fulfillment on time, reduce cleaning costs and to reduce number of storage units.     

The informational relevance of corporate social responsibility: evidence from DS400 index reconstitutions

This study examines the relationship between corporate social responsibility and financial performance by analyzing the intra‐industry wealth impact of additions and deletions to the Domini Social 400 index. Results from the event study analysis indicate that additions to the index generate a positive share price response for the announcement firm and a negative response by rival firms. The opposite reaction is observed for index deletions. Additionally, the share price response is more pronounced for informationally opaque industries. Our study highlights the importance of external monitoring agencies in providing meaningful information that helps resolve investor uncertainty regarding the quality of a firm's relationships with its primary stakeholders. Copyright © 2011 John Wiley & Sons, Ltd.     

借壳上市对我国沪深两市有效性影响研究

取2010-2013年沪深综指和2008-2013年间借壳上市公司的数据,基于单位根检验和事件分析法,用经GARCH改进的市场模型对我国沪深两市的有效性进行了实证研究.结果表明,我国沪深两市已达弱式有效,但还未达到半强式有效,上海股票市场有效性比深圳股票市场强,深圳股票市场投机行为比较明显.股价的提前反应从侧面反映了我国证券市场仍然不成熟,内幕消息提前泄露的可能性较大,对此应不断完善借壳上市过程中相关的法律法规;加大对公司借壳上市的监管力度;规范股票市场的各项机制,改进股票市场的有效性.     

企业对外直接投资微观绩效研究

以2007—2010年我国A股上市公司发生对外直接投资事件作为样本,一方面运用事件研究法探讨我国企业对外直接投资的市场绩效;另一方面结合因子分析法和数据包络分析考察财务绩效。研究表明,我国企业开展对外直接投资在短期内能够给股东带来一定的财富效应;在财务绩效方面,五年内财务变化趋势大致呈＂V＂型,对外投资完成后第三年业绩水平有所提高,但低于投资前一年,企业对外直接投资短期综合绩效未能明显改善。     

Estimating the Economic Impact of Event Tourism

Abstract

Tourism has become an important economic sector in many parts of the world, and many regions, states, and local areas have identified expenditures by visitors as a potential source of economic growth. Because visitor spending can contribute to the local economy, many communities seek to enhance tourism and visitor-oriented activities. As a result, estimates of the economic impact of event tourism are of interest to a wide variety of interested parties. Economic impact analyses of sports facilities and other entertainment events have come under increasing criticism in recent years. At the same time, visitors to sports events, festivals, and other visitor-oriented and event related activities can produce very substantial economic impacts for host communities. This article examines key considerations and issues that affect and are critical to reliable estimates of the economic impacts of events and event tourism.     

The Theory of Planned Behavior in the Context of a Food and Drink Event: A Case Study

The present case study seeks to contribute to the culinary event management literature, investigating key motivators among participants to the Derbyshire Food and Drink Fair, United Kingdom. A questionnaire, which was partly based on predictors related to the theory of planned behavior was designed and distributed; 308 usable responses were collected. The validity and impact of attitude toward the behavior, perceived behavioral control, and subjective norms on behavioral intention was confirmed. Additionally, several motivators, such as “commitment and perceived importance,” “consumption and entertainment,” “attendance and discovery,” and “joining others” were identified as key factors. Finally, statistically significant differences were noticed among various participating groups, namely, in terms of age, gender, or distance traveled to the event. The findings have important implications for event managers and organizers, in terms of promotion, and addressing the needs and wants of various segments of food festival attendees.     

Measuring the economic impacts of major sports events: the case of Formula One Grand Prix (F1)

This study was examined the new money generated from Formula One Grand Prix (F1) and the economic impacts of this new money on the host economy using input–output analysis. We find that the impact of the new money from non-local attendees or international attendees is more pronounced compared to that from local attendees. Also, F1 event appears to influence on sports-related industry as well as other industries such as manufacturing industry. Our findings suggest that the host cities should focus on increasing the non-local and international attendees in order to enhance the economic impacts of a sport event.     

Approaching paradox: Loving and hating mega-events

This paper examines the role of paradoxes in research and proposes strategies of engaging with them. For this purpose, it analyses the ways in which six paradoxes are constitutive of sports mega-events such as the Olympic Games: the universalism paradox, the compliance paradox, the winner's paradox, the participation paradox, the uniqueness paradox and the passion paradox. It then develops three strategies of how researchers and practitioners can approach paradox. The first, exploration, examines the consequences and effects of the ambiguity of paradoxes. The second, differentiation, enquires into the spatio-temporal and social make-up of paradoxes. The third, reframing, recasts paradoxes by shifting theoretical perspectives. Instead of pressing to resolve paradoxes, researchers and practitioners alike should make productive use of their ambiguity.     

Development and transformation of collaborative networks in events

This study examines the mechanisms by which and the reasons that leaders of non-profit organizations transform interorganizational collaborative networks through event attendance. Drawing from a two-wave survey, this study examines the interorganizational networks of 30 individuals who participated in both waves, along with the reported activities of 121 individuals who participated in the second wave of the survey. This mixed methods study found that events transformed participants’ weak ties into strong ties and promoted development of collaborative networks. Further, the study found that participants’ motivations for attending the event and following up with contacts afterward focused on sharing resources and deepening connections. Implications for understanding how events promote formation and transformation of collaborative networks are discussed.