考虑最坏中断损失下的P-中位设施选址问题的模型与算法研究

蓄意突袭以及恐怖袭击会造成设施服务的突然中断成为网络系统的主要危害之一,因此网络设施选址决策应该同时考虑正常和紧急状态下系统的运作成本.本文研究考虑最坏中断损失下的网络设施选址问题,建立了该问题的双层规划模型,上层规划涉及设施选址决策,下层规划研究确定设施位置后,设施中断产生最大损失的问题.本文运用基于拉格朗日松弛的混合遗传算法来求解该双层规划问题.将European150数据集作为研究对象,对比研究了本文研究问题与传统的P-中位选址问题的结果,分析不同选址策略下网络系统的效率被中断影响的程度是不同的.最后通过改变一些关键参数,比如常规运作权重、设施数量、中断设施数量,对相关结果进行了分析.     

基于似然估计的零售商库存鲁棒均值-风险模型

针对具有风险厌恶的零售商,建立了权衡期望利润和条件风险值（CVaR）的均值-风险库存优化模型,给出了离散需求分布不确定条件下能实现帕累托最优但具有较高保守性和非帕累托最优但具有较低保守性的两种鲁棒对应。针对不确定需求分布,在仅知历史需求样本数据情况下,应用统计推断理论构建了满足一定置信水平的基于似然估计的需求概率分布不确定集。在此基础上,运用拉格朗日对偶理论,将上述两种鲁棒对应模型转化为易于求解的凹优化问题,并证明了其与原问题的等价性。最后,针对实际案例进行了数值计算,分析了不同系统参数和样本规模对零售商最优库存决策及其运作绩效的影响,并给出了零售商期望利润和条件风险值两个目标权衡的帕累托有效前沿。结果表明,采用基于似然估计的鲁棒优化方法得到的零售商库存策略具有良好鲁棒性,能够有效抑制需求分布不确定性对零售商库存绩效的影响。而且,历史需求样本规模越大,鲁棒库存策略下的零售商运作绩效越接近最优情况。进一步,通过对比发现,两种鲁棒对应模型虽然保守性不同,但在最终库存策略上保持一致。     

Prices,Markups, and Trade Reform

This paper examines how prices, markups, and marginal costs respond to trade liberalization. We develop a framework to estimate markups from production data with multi‐product firms. This approach does not require assumptions on the market structure or demand curves faced by firms, nor assumptions on how firms allocate their inputs across products. We exploit quantity and price information to disentangle markups from quantity‐based productivity, and then compute marginal costs by dividing observed prices by the estimated markups. We use India's trade liberalization episode to examine how firms adjust these performance measures. Not surprisingly, we find that trade liberalization lowers factory‐gate prices and that output tariff declines have the expected pro‐competitive effects. However, the price declines are small relative to the declines in marginal costs, which fall predominantly because of the input tariff liberalization. The reason for this incomplete cost pass‐through to prices is that firms offset their reductions in marginal costs by raising markups. Our results demonstrate substantial heterogeneity and variability in markups across firms and time and suggest that producers benefited relative to consumers, at least immediately after the reforms.     

A low-cost approach to computer-integrated manufacturing in a small chemical unit

Many firms are considering CIM as a means of reducing costs and increasing quality. Sometimes, however, a major problem in this kind of project seems to be the high investments involved. In this paper a methodology for developing a low-cost CIM application is presented. The proposed methodology was successfully experimented in a small chemical unit of one of the leading producers of nylon in the world. The paper reports on the design and implementation of the computer-integrated manufacturing and the associated costs and benefits.     

International market selection strategies selected by ‘micro’ and ‘small’ firms

Policy-makers and practitioners are seeking to promote the development of established firms. This paper suggests they may need to target customized export programmes to the specific situational demands of established ‘micro’ and ‘small’ firms. The following broad research question is explored: are there differences between ‘micro’ and ‘small’ firms with regard to the decision to sell goods or services abroad? In 1990/91, survey responses were gathered from 621 independent businesses located in Great Britain. In 1997, a follow-on telephone survey was conducted with 150 surviving firms. This survey gathered information on the propensity to export goods or services abroad and the mode of export behaviour reported by established ‘micro’ as well as ‘small’ firms. The performance of exporting and non-exporting firms was also compared. Implications for policy-makers, practitioners and researchers are highlighted.     

Evidence on the Superiority of Analysts Quarterly Earnings Forecasts for Small Capitalization Firms*

Financial analysts provide information to support investment analysis and decisions for an ever increasing number of firms. As part of their services they also produce earnings forecasts for covered firms. While there has been much research investigating the determinants of financial analyst earnings forecast superiority for large, widely-followed firms, little research has focused on smaller firms. Until recently, these smaller firms have been largely ignored. This study focuses exclusively on small firms and provides evidence of differing behavior for such firms compared to results previously reported for large firms. Errors in quarterly earnings per share forecasts of small firms obtained from a univariate time-series model are also examined. Regression results indicate that time-series model parameters possess information content with respect to forecast accuracy for analyst-covered firms only. These results are obtained after controlling for firm size, model adequacy, and industry, quarter, and year effects. This suggests that analysts are more likely to cover small firms for which they are able to decipher information correlated with that impounded in the “shocks” in the quarterly earnings time series as captured by the time-series model parameters.     

International new ventures and governance structures—are international entrepreneurs strategic or entrepreneurial?

Born Global firms have attracted significant research interest over the past decade and one of the recurring research questions is how Born Global firms are able to overcome resource limitations to establish effective international sales and marketing channels so rapidly. Several qualitative studies have been performed in order to investigate this question and most conclude that Born Global firms do it by using entrepreneurial hybrid structures to govern their international activities. This study offers a quantitative analysis on whether there are significant differences between the international activities of small international firms and seeks to determine whether Born Global firms are more ‘entrepreneurial’ in terms of governance of their international activities and resources than other small international firms. The study adopts Aspelund and Moen’s (2005) classification of small international firms according to their time to internationalization and share of foreign sales and investigates differences in characteristics and governance of international activities. As expected, the study found differences in a broad range of characteristics between the firms that had adopted the different internationalization strategies. More surprisingly, the study fails to identify any differences between the firms on international governance structures for international operations. This a very intriguing result as it opposes a lot of qualitative work over the past decade and it also implies that Born Global firms are strategic in deciding their governance structures for international marketing activities regardless of their resource situation. Implications of the findings are discussed and alternative venues for further research are proposed.     

The Role of the Community in the Implementation of the EPA's Rule on Risk Management Programs for Chemical Accidental Release Prevention

Regulations under the 1990 Clean Air Act Amendments (CAAA) include requirements for preventing accidental chemical releases. Section 112(r) of the CAAA, the Accidental Release Provisions, requires the U.S. Environmental Protection Agency (EPA) to develop and implement regulations for preventing accidental releases to the air of regulated substances and to minimize the consequences of releases that do occur. The regulations require regulated facilities to have in place the structural elements of a sound process safety program, and to practice, document, and communicate the elements of their program. The rule requires also that registered facilities calculate and make available worst case accidental chemical release information. The rule does not set a level of risk that a facility must achieve after it takes the required compliance steps, the level of risk a community must accept, the limit of consequences the community might suffer from a worst case chemical release, nor the specific actions a community must take in its response plan. These are issues that local communities and local officials must decide. Because the regulation involves the community in many unsettled risk issues the Wharton School initiated a project within the City Philadelphia to evaluate the proposition that productive dialogue on the implementation of the Rule and resolution of unsettled risk issues can take place in advance of a crisis occasioned by a major accidental release. This paper describes the steps taken by Wharton to bring together various stakeholders in the community to explore the implementation of the rule and the reaction of those stakeholders to be involved in such a process. It outlines some principal choices communities will have to make in order to implement 112(r) and explains some of the dilemmas associated with these choices. It describes the stakeholder-based implementation effort being undertaken in Philadelphia in the hope that others may benefit from what has been learned there.     

Building Industry–University Research Centers: Some Strategic Considerations

This paper reviews the importance of industry–university relationships and the strategic considerations within the context of these partnerships in university research centers. We have identified several factors that are particularly important to industry in building relationships with university centers. These include: acquiring skills, knowledge and gaining access to university facilities; organizational cultures that are more organic; flexible university policies for intellectual property rights, patents and licenses; and the presence of champions. Firms also have explicit collaborative strategies for partnering with universities where firms can be segmented into three distinct clusters: Collegial Players, Aggressive Players and Targeted Players. Collegial Players are often large firms working with universities and university-sponsored consortia on topics of interest that have long-term value rather than promise immediate commercial opportunities. Aggressive Players are both large and small firms who employ university relationships specifically to develop and commercialize a wide range of marketable products and services. Targeted Players are often smaller firms, largely interested in using university relationships to address specific issues central to their business. We conclude by discussing key implications for both industry and universities.     

强制性约束下企业信息安全投资与网络保险的最优决策分析

研究了强制性约束下企业信息安全投资和网络保险的最优决策问题,对比了可观测企业损失和不可观测企业损失两种情形下基于破产概率约束的最优安全投资和网络保险保费厘定。研究结果表明：在可观测损失和公平保费情况下,当最大化单个企业的期望效用时,存在最优安全投资额,并且政府补贴和强制性约束都可以激励企业增加安全投资;但是当最大化所有企业效用时,只有强制性约束才能增加企业安全投资使得总效用最大化,并且企业的最优安全投资与损失的可观测程度无关。在不可观测损失情况下,当最大化单个企业期望效用时,企业的安全投资增大,而最大化所有企业效用时,存在正网络外部性,即任何企业均不敢轻易的减少安全投资,即使同在一个网络中的其他企业减少了安全投资。此外,在破产概率约束下,随着保费的增加,当损失可观测时,企业的安全投资也增加,但期望效用减少了;而当损失不可观测时,企业的安全投资和期望效用均减少。本文所得结论对政府设定强制性标准,以及企业利用安全投资和网络保险进行信息安全风险控制具有较好的参考价值。     

言多必失?管理层报告的样板化及其经济后果

样板化报告在古今中外都有广泛的运用, 但报告者面临两难:一方面, 样板化有利于规避披露风险;但另一方面, 样板化又不利于传递内部信息.那么, 投资者如何评价中国上市公司的报告的样板化程度?以中国上市公司的管理层讨论与分析的文字为样本, 用公司t期和t-1期报告的纵向文本相似度以及本公司和其他公司同期的报告的平均横向相似度来衡量样板化的水平, 并考察了其经济后果.检验结果表明, 纵向样板化的经济后果呈现相机抉择性, 当公司财务风险高 (亏损、微利或者被出具非标准审计意见) 时, 信息效应占优, 样板化的报告引发负面的市场评价, 而当公司财务风险较低, 风险效应占优, 样板化的报告则引发市场的好评.另一方面, 报告横向样板化则引起了整体的负面评价.在调节效应方面, 纵向样板化的经济后果受公司创新、特质信息、董事长权力和停牌次数的影响, 横向样板化的经济后果则受到公司独立董事的社会网络位置的影响.综合结果表明, 公司管理层讨论与分析的横向样板化, 以及在高财务风险条件下的纵向样本化都会因信息披露不足而引起负面的经济后果.     

Internal knowledge generation: the research laboratory and innovative productivity in the pharmaceutical industry

As firms face increasing pressures associated with new forms of knowledge-based competition, researchers have begun to focus on knowledge acquisition strategies to the point of ignoring knowledge creation strategies. This paper investigates the impact of research centers in the pharmaceutical industry upon this neglected form of knowledge creation–innovation productivity. We find that firms with separate research facilities are more innovative than firms without such facilities. The results diverge when locational distance of the laboratory is considered for patent versus drug innovations, and vary across diversification types. These findings suggest that managers and researchers need to consider the relationship between the research center and corporate headquarters — and the role of the corporate headquarters — when developing knowledge generation strategies.     

A Field Study of RFID Deployment and Return Expectations

Radio Frequency Identification (RFID) technology promises to transform supply chain management. Building on previous research in information systems and supply chain management, this paper proposes a theoretical framework for RFID adoption and benefits, and tests the framework using data on u. s. firms. Our analysis suggests that there is a positive association between information technology (IT) application deployment and RFID adoption. We find that RFID implementation spending and partner mandate are associated with an expectation of early return on RFID investment, and a perceived lack of industry‐wide standards is associated with an expectation of delayed return on RFID investment. These results suggest that firms with broad IT application deployment and a critical mass of RFID implementation spending are more likely to report early returns from RFID deployments. This paper extends previous research to understand the relationship between organization characteristics and adoption and expected benefits of the emerging RFID technology.     

Petroleum and Hazardous Material Releases from Industrial Facilities Associated with Hurricane Katrina

Hurricane Katrina struck an area dense with industry, causing numerous releases of petroleum and hazardous materials. This study integrates information from a number of sources to describe the frequency, causes, and effects of these releases in order to inform analysis of risk from future hurricanes. Over 200 onshore releases of hazardous chemicals, petroleum, or natural gas were reported. Storm surge was responsible for the majority of petroleum releases and failure of storage tanks was the most common mechanism of release. Of the smaller number of hazardous chemical releases reported, many were associated with flaring from plant startup, shutdown, or process upset. In areas impacted by storm surge, 10% of the facilities within the Risk Management Plan (RMP) and Toxic Release Inventory (TRI) databases and 28% of SIC 1311 facilities experienced accidental releases. In areas subject only to hurricane strength winds, a lower fraction (1% of RMP and TRI and 10% of SIC 1311 facilities) experienced a release while 1% of all facility types reported a release in areas that experienced tropical storm strength winds. Of industrial facilities surveyed, more experienced indirect disruptions such as displacement of workers, loss of electricity and communication systems, and difficulty acquiring supplies and contractors for operations or reconstruction (55%), than experienced releases. To reduce the risk of hazardous material releases and speed the return to normal operations under these difficult conditions, greater attention should be devoted to risk‐based facility design and improved prevention and response planning.     

Locating independent facilities with maximum weight: Greedy heuristics

The problem is to locate a maximum-weight set of facilities such that no two are closer than a given distance from each other. The unweighted version is equivalent to the maximum independent set problem in graph theory. This paper presents four greedy heuristics and shows that they all have bad worst-case behavior. Empirically, however, these heuristics perform quite well in the relatively large test problems generated randomly.     

Credibility, Information Preferences, and Information Interests

The Seveso Directive of the European Union demands that information be provided to the public by companies and authorities about facts, risks, and behaviors related to hazardous facilities, in particular chemical facilities. On behalf of the Commission of the European Communities, a survey was run in five European countries on the credibility of various information sources. This article describes the results of the German study. 430 persons were interviewed with a questionnaire of 50 items, in particular about their perceptions and evaluations of technical risks, the credibility of sources of information about chemical risks, their preferences for receiving risk information from these sources, and their interests in receiving information. Major findings are great differences in credibility, differentiated information preferences, and strong information interests. Surprisingly, credibility played only a minor role with regard to the respondents'information preferences and interests.     

企业信息披露中的模仿行为研究——基于制度理论的分析

本文在制度理论的分析框架下,研究合法性压力和不确定性条件下企业信息披露中的模仿行为及由此导致的制度同形现象.本文以2006-2010年我国重污染行业上市公司年报中的环境信息披露为研究对象,发现企业环境信息披露存在同形性和模仿行为,且属于模仿其它企业平均水平的频率模仿,而不是模仿领先者.本文将已有的信息披露研究从经济学分析的视角向经济社会学进行拓展,丰富了对信息披露过程中决策者认知过程和制度化过程的认识,同时也透过信息披露中的模仿行为从更加微观的层面为制度化过程中的趋同现象提供了新的证据.     

Toward a capabilities perspective of the small firm

This paper attempts to explain the competitive advantages of the small firm in the capabilities perspective. It begins by identifying the kinds of strategic assets possessed by small firms. It argues that entrepreneurship and a simple capital structure are the sources of dynamism for small firms. The relationship between the small firm's resources and its capabilities are then critically examined. In particular, the analysis focuses on the influences of strategic assets on the organizational flexibility – a significant source of competitive advantage enjoyed by small firms. The competitive attributes of small firms are further discussed in terms of firm's internal and external capabilities. Finally, the relationship between the small firm's capabilities and the choice of technology strategies is examined.     

Management development in small firms

This paper is a review of the literature concerning management development in small firms. It looks at the benefits in terms of growing a small firm and whether the lack of management skills contributes to their failure. In addition, this paper looks at some of the barriers to management development, including the attitudes and characteristics of the entrepreneur, and also looks at learning models that may be appropriate for small firms. The paper also looks at the authors’ views on the effectiveness of management development for small firms, the barriers to learning as well as the skills required. Management development programmes are now widely accepted as a means of improving the competitiveness of firms and the economy as a whole. Although management education and training has, in the past, been designed mainly for larger firms, there is a growing awareness of the requirements of small businesses. Government initiatives designed to encourage start‐ups and to boost the growth of small firms have emphasized the importance of management development. This review of the literature shows that, on balance, management development programmes are effective for small firms. The main benefits appear to be survival and growth, reduction in failure and improvement in performance. The skills required include leadership and management, developing management systems and techniques and team building. Other skills include planning, delegation and financial management. The paper concludes that there is a need for further research into the effectiveness of management development programmes, the skills required and the barriers to learning in small firms and, also, whether they have an impact on the survival, growth and profitability of small firms.     

Empirical Evidence on the Effectiveness of Social Public Procurement Policy: The Case of the Swiss Apprenticeship Training System

In this paper, we assess the effectiveness of a social public procurement policy in Switzerland that gives firms that train apprentices a preferential treatment. We estimate the effectiveness of this social procurement policy on a firm's training participation, training intensity, and training quality using information from a representative and large firm survey. The results show that the policy increases the number of training firms, and does not affect training quality negatively. However, the effect is limited in size, as only small firms and firms operating in sectors where public procurement represents a large share of the business, are affected positively.