基于AMESet的制动检验台滚筒自定义建模

在AMESim中进行滚筒反力式制动检验台检测过程的仿真分析,需要以元件子模型的形式对滚筒的物理模型进行准确、形象的表示。在动力学分析的基础上,根据AMESim的建模原理给出了滚筒子模型应具有的功能,设计了代表滚筒子模型的元件,基于AMESet实现了滚筒的自定义建模。在AMESim中的验证表明,滚筒的自定义子模型符合AMESim的元件规则,计算正确,满足功能需求,实现了预期目标。     

Pattern of information technology use: The impact on buyer–suppler coordination and performance

The use of information technologies between supply chain organizations has been shown to promote organizational coordination and have a positive impact on performance. Drawing from organizational theories of learning, we build on this research by proposing a model that relates the pattern of supplier use of IT to specific types of supply chain coordination activities and a comprehensive set of organizational benefits. Specifically, we evaluate how two patterns of IT use by suppliers (exploitation and exploration) relate to two specific types of coordination activities with their buyers (operational and strategic coordination), which in turn are posited to promote specific organizational benefits. Using data from 241 first-tier OEM suppliers in the computer industry, our findings show that each pattern of IT use directly promotes a specific type of coordination activity. Although both types of coordination activities are needed to achieve both strategic and operational benefits, we find each coordination activity to be uniquely promoted by a specific pattern of IT use. IT use for exploitation is found to be an antecedent to operational coordination; IT use for exploration is found to be an antecedent to strategic coordination. No crossover between pattern of use and coordination activities is found. Our findings show that to achieve a complete set of benefits, suppliers must ultimately use IT for both exploration and exploitation. These findings provide a deeper understanding of the mechanism of how the pattern of IT use can result in a comprehensive set of organizational benefits for supplier firms.     

物流配送中心工作流程的建模与仿真

根据配送中心的作业特点,分析了物流配送中心基本组成和作业流程,将物流配送中心剖析为进货、存储、流通加工、分拣、出货子系统,应用赋时着色Petri网(TCPN)对配送中心系统进行建模.通过对配送中心系统进行计算机仿真,找出了该系统在作业过程中的"瓶颈",提出了资源和流程的改进措施.     

维修备件库存的两级优化研究

针对汽车维修备件的库存储备存在配置不合理的问题,提出了一种优化方法。该方法在遗传算法的基础上,采用仿真方法建立汽车的使用可用度模型,实现备件库存配置的两级优化,并实现了在满足备件库存成本约束的前提下,使汽车的使用可用度达到最大,即修复率的最大化。给出了应用该方法的具体步骤,并通过数值分析与讨论,验证了该算法的有效性。     

Administración del riesgo crediticio al menudeo en México: una mejora econométrica en la selección de variables y cambios en sus características

The early prediction of bad debtors in revolving loans in Mexico is a relevant current issue. The proposed econometric model of behavioral scoring considers the changes in the characteristics of consolidated clients and produces better results than those obtained with methodology used by the CNBV on provisions. The obtained results show the possibility of replacing the current model, minimizing the expected loss and increasing the ROA of Mexican financial institutions in 2.20% complying the methodology and statistical testing criteria according to the Unique Banking Dispositions and the guidelines of Basel II on credit risk.     

Using meta‐analytic structural equation modeling to advance strategic management research: Guidelines and an empirical illustration via the strategic leadership‐performance relationship

This paper demonstrates how meta‐analysis can be combined with structural equation modeling (MASEM) to address new questions in strategic management research. We review this integration, describe its implementation, and compare findings from bivariate meta‐analyses, a direct‐effect structural equations model, and two mediating frameworks using data on the strategic leadership and performance relationship. Results drawn from 208 articles that collectively included data on 495,638 observations demonstrate the new insights available from MASEM while also suggesting a revision to conventional thinking on strategic leadership. Whereas some theories posit that boards of directors influence firm performance through monitoring and disciplining the top management team, MASEM provides more support for the view that boards mediate the top management teams' decisions. Implications for applying MASEM in strategic management are offered. Copyright © 2014 John Wiley & Sons, Ltd.     

基于师生心理契约量表的高校本科生学习行为评价及引导

“大数据时代”的时代背景下,统计学作为一门搜集和分析现象数量特征的方法论科学正面临着一轮新的机遇与挑战,因此培养高素质创造型统计学人才成为经济和社会发展的关键。基于此,以统计学专业为例,选取东、中、西部三所财经类高校统计学专业师生为调查样本,采用师生心理契约量表,分别从教师与学生视角评价学生各类学习行为履行情况,讨论统计学专业本科生学习行为中的优势与劣势,测度对综合学习素质影响大和与其相关性强的因素,探讨教师与学生评价的契合程度,并据此提出了具体的提高本科生学习素质的策略性意见,为各高校有针对地改进学生管理模式和提高学生培养质量提供参考建议。     

Public perceptions of food-related risks: a cross-national investigation of individual and contextual influences

Public concerns about food risks have grown in recent decades in response to many food-related scandals. Despite some evidence that risk concerns vary across societies and risk domains, these variations remain understudied. To address this gap, this paper conducts a multi-level analysis of public concerns about biological and chemical/technical food risks in 26 European countries. Findings confirm previous work on individual predictors of risk concern and suggest that several contextual factors contribute to cross-national variations: aggregate perceptions of risks as unnatural, retail concentration in the food sector, and media coverage. The effect of institutional trust on risk concerns varies substantially across nations. Findings also reveal important differences in public concerns about biological versus chemical/technical food risks, supporting the view that food risk perception is multi-dimensional and complex.     

Transparency and the regulatory process in Europe and the United States: two research priorities

Transparency research related to the regulatory process would benefit most from two types of empirical studies. One batch of studies, described in the fifth section of this essay, would focus on the American states and the member states of the European Union to identify the factors that determine whether regulatory processes are more transparent and whether transparency is successful in improving regulations and the regulatory process. In other words, we need comparative state (for the US) and member state (for the EU) studies to develop metrics for the quality of regulations and the role of transparency is advancing or weakening the quality of regulations at the state (for the US) and member state (for the EU) level. The second batch of studies, described in the sixth section of this essay, would explore who uses the information currently provided at the levels of transparency currently available in regulatory processes at the European Union and federal government of the United States. Who benefits from transparency and how are they using the available transparency mechanisms?