相关性评价中人际亲和性的一主多从模型及其改进

相关性评价中牵涉到大量的被评价管理者互相评价的问题,评价结果通常和奖惩有关.相关性评价提倡在被评管理者中间保持适当的亲和性,但过度的亲和性难以避免地会产生合谋行为.本文针对这种现象建立一个一主多从模型,随后对模型加以改进,以分析公司与被评者、被评者与被评者之间的博弈关系,进而得出相应的结论.     

PC软件产品竞争性升级的定价研究

通过Hotelling模型对PC软件产品竞争性升级进行了研究,重点分析了网络外部性、转换成本、升级产品质量(或功能)的提高对升级定价及其竞争策略的影响.主要成果包括以下几个方面(1)在消费者静态预期的条件下,网络规模大的厂商总是偏好不兼容,网络规模小的厂商偏好全兼容.(2)分析了影响版本升级价格、竞争性价格和全价的相关因素.(3)解释了转换成本和实施竞争性升级的关系.(4)分析了厂商夺取竞争对手厂商客户的条件以及争夺新客户的竞争策略.对厂商的竞争性升级定价具有重要的理论指导意义.     

Hard‐to‐Solve Bimatrix Games

The Lemke–Howson algorithm is the classical method for finding one Nash equilibrium of a bimatrix game. This paper presents a class of square bimatrix games for which this algorithm takes, even in the best case, an exponential number of steps in the dimension d of the game. Using polytope theory, the games are constructed using pairs of dual cyclic polytopes with 2d suitably labeled facets in d‐space. The construction is extended to nonsquare games where, in addition to exponentially long Lemke–Howson computations, finding an equilibrium by support enumeration takes on average exponential time.     

基于模糊规划的QFD 系统参数确定方法

针对QFD 系统的内在模糊性,运用带有对称三角形模糊系数的模糊规划理论,提出了一 种确定QFD 系统参数的方法. 并通过工程特性目标值的规范化,定义产品开发总成本函数、工 程特性改进成本函数及改进成本系数等概念,建立了一个QFD 规划模型. 仿真结果表明,该模 型能够帮助开发人员在不确定的、模糊条件下有效确定关联函数及自相关函数,优化顾客需求 的满意水平,确定工程特性目标值,使新开发/ 改进的产品顾客满意度赶上或超过目标市场上 的竞争企业,并满足开发预算约束.     

同类异质产品市场博弈Nash均衡最优策略模型

本文按照Nash均衡解的要求,建立同类异质产品市场用户需求分布及效用结构模型,导出不同定位的企业所实施竞争策略的若干最优条件,通过计算不同策略设计下产品相应的临界功能效用值,参与竞争的企业可找到适合于市场需求的最优决策。     

Is There a Curse of Dimensionality for Contraction Fixed Points in the Worst Case?

This paper analyzes the complexity of the contraction fixed point problem: compute an ε‐approximation to the fixed point V*Γ(V*) of a contraction mapping Γ that maps a Banach space B_d of continuous functions of d variables into itself. We focus on quasi linear contractions where Γ is a nonlinear functional of a finite number of conditional expectation operators. This class includes contractive Fredholm integral equations that arise in asset pricing applications and the contractive Bellman equation from dynamic programming. In the absence of further restrictions on the domain of Γ, the quasi linear fixed point problem is subject to the curse of dimensionality, i.e., in the worst case the minimal number of function evaluations and arithmetic operations required to compute an ε‐approximation to a fixed point V*∈B_d increases exponentially in d. We show that the curse of dimensionality disappears if the domain of Γ has additional special structure. We identify a particular type of special structure for which the problem is strongly tractable even in the worst case, i.e., the number of function evaluations and arithmetic operations needed to compute an ε‐approximation of V* is bounded by Cε^−p where C and p are constants independent of d. We present examples of economic problems that have this type of special structure including a class of rational expectations asset pricing problems for which the optimal exponent p1 is nearly achieved.     

加强实践教学改革适应学生就业市场竞争

加强实践教学改革是面向 2 1世纪高等工科院校教育改革的需要 ,大学毕业生分配制度的改革也对实践教学环节提出了更高要求。我校给水排水工程专业对实践教学进行大胆创新 ,走出了一条“试用式”毕业实习及毕业实习、毕业设计“一条龙”的新路 ,突出了学生能力的培养 ,适应了愈来愈激烈的就业市场竞争需要     

加快科技奥运建设,促进首都实现跨越式发展

科技奥运是中国申奥成功的重要理念 ,也将成为北京举办奥运会的重要保障条件。加快科技奥运建设对于实现奥运承诺 ,促进首都乃至全国经济、科技的发展都具有深远的意义。“以科技助奥运 ,以奥运促科技”是科技奥运建设的重要内容。本文从科技奥运提出的背景、含义、建设目标、主要任务、实施一年多来取得的进展等方面进行了比较全面的描述。     

《60分钟》与《东方时空》节目形态之比较

《60分钟》和《东方时空》是美中两国最具代表性的电视新闻杂志节目。为了进一步揭示这类节目的编辑规律,从四个方面对二者的节目形态进行比较分析。《60分钟》与《东方时空》都非常重视电视语言的合理运用,并逐步形成了各自的风格,但是在栏目设置、节目特征与形象设计、主持技巧等方面存在较大差异。     

The Clinical Uses of Video Therapy in the Treatment of Childhood Sexual Trauma Survivors

The power of visual images, combined with the increased availability of video taping equipment, has dramatically expanded the use of recorded images in psychotherapy over the past three decades. However, it appears that earlier video feedback techniques may not have fully capitalized on this modality's potential for catalyzing therapeutic change. Further, we have found scant literature on the use of video therapy in the treatment of adult survivors of sexual trauma. Drawing conceptually from a trauma model, as well as from cognitive behavioral and systemic/cybernetic frameworks, this article describes the therapeutic use of video therapy in the treatment of childhood sexual abuse. In video therapy, the patient is directed to independently view video recordings of therapy sessions to help correct cognitive and affective distortions resulting from trauma. How these distortions develop within the context of an incest "family trance" and how they are connected with processes of conditioning and programming are discussed. Further, the use of video therapy for marital therapy, perpetrator confrontations, and addressing suicidal impulses is described. The need for further empirical research is highlighted.