Prospects and problems in modeling group decisions

This paper summarizes some of the major issues related to group decision modeling. We briefly review the existing work on group choice models in marketing and consumer research. We draw some generalizations about which models work well when and use those generalizations to provide guidelines for future research.     

培育物流运输企业核心竞争力

该文通过对物流运输企业核心竞争力内涵、特性及要素的分析,指出我国物流运输企业应以机制创新为前提,以营销创新为核心,以技术创新为基础,以文化创新为动力,加快培育企业的核心竞争力。     

HIGH‐ORDER SHORT‐TIME EXPANSIONS FOR ATM OPTION PRICES OF EXPONENTIAL LÉVY MODELS

The short‐time asymptotic behavior of option prices for a variety of models with jumps has received much attention in recent years. In this work, a novel second‐order approximation for at‐the‐money (ATM) option prices is derived for a large class of exponential Lévy models with or without Brownian component. The results hereafter shed new light on the connection between both the volatility of the continuous component and the jump parameters and the behavior of ATM option prices near expiration. In the presence of a Brownian component, the second‐order term, in time‐t, is of the form , with d₂ only depending on Y, the degree of jump activity, on σ, the volatility of the continuous component, and on an additional parameter controlling the intensity of the “small” jumps (regardless of their signs). This extends the well‐known result that the leading first‐order term is . In contrast, under a pure‐jump model, the dependence on Y and on the separate intensities of negative and positive small jumps are already reflected in the leading term, which is of the form . The second‐order term is shown to be of the form and, therefore, its order of decay turns out to be independent of Y. The asymptotic behavior of the corresponding Black–Scholes implied volatilities is also addressed. Our method of proof is based on an integral representation of the option price involving the tail probability of the log‐return process under the share measure and a suitable change of probability measure under which the pure‐jump component of the log‐return process becomes a Y‐stable process. Our approach is sufficiently general to cover a wide class of Lévy processes, which satisfy the latter property and whose Lévy density can be closely approximated by a stable density near the origin. Our numerical results show that the first‐order term typically exhibits rather poor performance and that the second‐order term can significantly improve the approximation's accuracy, particularly in the absence of a Brownian component.     

Statistical manipulability of social choice functions

We consider the proportion of profiles at which an anonymous neutral social choice function cannot be manipulated to any coalition's advantage. We fix the number of alternatives and consider the limit as the number of individuals goes to infinity, and assume that the limit of the fraction of all profiles in the domain is 1. We show that there is a continuous function on “profile vectors’ which gives the maximum probability of strategy-proofness, and that this is strictly between 0 and 1 for three alternatives. We also analyze a number of common social choice functions along these lines.     

员工参与对于预算管理绩效影响的路径分析

本文以路径分析方法为基础,对我国上市公司内员工参与和管理绩效之间的关系进行了实证研究。研究结果发现,员工对于预算目标的接受度会对员工参与和管理绩效之间的关系产生影响,其影响程度会受到预算目标困难度的调节,预算目标困难度高时,员工参与可经由强化预算目标接受而间接提升预算管理绩效;困难度低时,则无此效果。     

Value Congruence Awareness: Part 2. DNA Testing Sheds Light on Functionalism

Part 1 of this exploratory study demonstrated that for terminal, instrumental, and work values, supervisors could only accurately assess the extent to which their terminal values are congruent with their employees, whereas, employees could only accurately describe degrees of alignment with their supervisors' work values. Thus, supervisors appear to possess conscious awareness of the terminal values held by their employees and employees similarly possess conscious awareness of their supervisors' work values. Part 2 of the study examined what each of these two parties might do with their conscious knowledge concerning value congruence with the other member. Supervisor ratings and employee self-ratings concerning employee job performance, citizenship, climate fit, working relationship (LMX), and other issues, were correlated with supervisor terminal value congruence estimates and employee work value congruence estimates respectively. For supervisors, only one significant finding was noted, indicating a positive relationship between the supervisors' awareness of terminal value congruence with the employee and the supervisors' estimate of the employee's potential for future promotion. For employees, seven hypotheses received support demonstrating relationships between the employees' 0awareness of supervisor/employee work value congruence and self-ratings of work behaviours, citizenship behaviours, volunteerism behaviours, work climate behaviours, work climate attitudes, work climate organizational-wide attitudes, and the supervisor/employee working relationship. Implications for management and future research are discussed.     

物流文化的作用及其建设思路

在激烈竞争的形势下,加强我国物流文化建设非常必要。为此,物流企业必须准确把握物流文化建设的基本目标,强化物流文化的塑造过程,积极学习新知识,不断丰富物流文化内涵。     

Incorporating heterogeneity with store-level aggregate data

This paper introduces a methodology to incorporate heterogeneity in the analysis of store level aggregate data. The proposed model is validated using two sets of scanner panel data, for tuna and ketchup, and their corresponding weekly aggregate data. The model recovers the true parameters with acceptable accuracy.The model has several advantages over the previous aggregate models, such as the linear model, the semilog model, and the log-log model. First, the cross-price elasticities estimated from the model show the asymmetric responses to the price promotions very close to those from the logit model applied to the panel data. Second, the model shows better prediction performance.     

美军分布式通用地面站系统的发展现状与趋势

作为美军情报接收、处理和分发的主要系统,近年来,分布式通用地面站系统（DCGS）在全球信息栅格(GIG)、云技术、大数据等新兴信息技术推动下取得了显著建设成果。简要介绍了美军各军种DCGS系统的项目进展,重点总结了空军DCGS-AF系统和陆军DCGS-A系统的发展现状及技术特性,包括DCGS-AF Block 10.2和DCGS-A 3.0 Griffin软件基线的架构和能力等,结合DCGS系统在伊拉克和阿富汗战场的作战应用分析了系统的未来发展趋势,以期为相关人员提供参考。