Inverse maximum flow problems under the weighted Hamming distance

In this paper, we consider inverse maximum flow problem under the weighted Hamming distance. Four models are studied: the problem under sum-type weighted Hamming distance; the problem under bottleneck-type weighted Hamming distance and two mixed types of problems. We present their respective combinatorial algorithms that all run in strongly polynomial times.Research supported by the National Natural Science Foundation of China (60021201), and the Hong Kong Research Grant Council under CERG CityU 9041091 and CUHK 103105.     

控制权和现金流量权偏离下的公司价值和公司治理

本研究运用La Porta et al追踪公司"最终控制权"的方法,通过分析终极控制股东的控制权与现金流量权偏离对公司价值的影响程度,来衡量控制股东对于小股东财富剥夺的程度.实证研究发现我国上市公司的终极控制股东普遍运用投资公司控股、金字塔结构的方式获取控制权,并因此而使其控制权与现金流量权产生偏离,且偏离幅度越大,上市公司的市场价值就越小,终极控制股东对小股东剥削的程度就越大,其中又以终极控制股东为家族企业的上市公司最为严重.     

终极控制权、现金流量权与企业价值——基于隐性终极控制论的中国上市公司治理实证研究

在探寻上市公司“终极控制权”的基础上,分析具有隐性终极控制权的上市公司中的终极控制股东的控制权、现金流量权对公司绩效和价值的影响程度,进而度量隐性终极控制股东对于中小投资者利益的影响.实证结果表明我国上市公司普遍存在隐性终极控制股东,并通过金字塔结构等方式使其终极控制权与现金流量权产生偏离,且偏离幅度与上市公司的市场价值负相关,不同类型的终极控制股东控制的公司有显著差异.     

公司价值的随机优化模型

本文研究了净现金流为随机过程情况下的企业价值,并建立了企业价值的随机优化模型。探讨了在一定的风险水平和其它相关约束条件下,确定企业的资本结构、企业债务的承担能力等,使得公司价值最大化,并应用于实际项目中。     

The Flow Shop Scheduling Polyhedron with Setup Times

This paper addresses the problem of improving the polyhedral representation of a certain class of machine scheduling problems. Despite the poor polyhedral representation of many such problems in general, it is shown that notably tighter linear programming representations can be obtained for many important models. In particular, we study the polyhedral structure of two different mixed-integer programming formulations of the flow shop scheduling problem with sequence-dependent setup times, denoted by SDST flow shop. The first is related to the asymmetric traveling salesman problem (ATSP) polytope. The second is less common and is derived from a model proposed by Srikar and Ghosh based on the linear ordering problem (LOP) polytope. The main contribution of this work is the proof that any facet-defining inequality (facet) of either of these polytopes (ATSP and LOP) induces a facet for the corresponding SDST flow shop polyhedron. The immediate benefit of this result is that all developments to date on facets and valid inequalities for both the ATSP and the LOP can be applied directly to the machine scheduling polytope. In addition, valid mixed-integer inequalities based on variable upper-bound flow inequalities for either model are developed as well. The derived cuts are evaluated within a branch-and-cut framework.     

民营企业发展过程中的制度冲突与人才流动

在社会转型过程中,已成长为我国经济重要力量的民营企业,正在传统的家族式管理制度与现代企业管理制度的冲突中艰难前行。对民营企业中制度冲突与人才流动关系的研究,具有理论和现实的双重意义。在社会转型过程中,民营企业的制度变迁和人才流动也存在双向互动和双向建构的关系。制度冲突影响员工的组织归属感,从而影响其流动,而员工的流动必定促使民营企业在制度变迁和制度创新上作出回应。     

表现性动态评价体系关键环节的构建

自上世纪80年代起,针对传统考试方式的批评日见增多。在尝试解决考试和教学矛盾的问题上,各个考试设计部门对自身的考试进行各种各样的改革;与此同时,教学的主体,即教师和学生,对自己的教和学进行自主的表现性评价的实验。实践表明,表现性评价手段能更科学、更全面、更合理地评价学生的学习过程和结果。因此,明确表现性评价基本理论,构筑其中的关键性环节,是做好教育教学中应用表现性评价的基础。     

电模拟平面径向流理论在实际运用中几个问题的探讨

本文探讨了利用水电模拟原理,电模拟平面径向流理论在实际运用中存在的问题。分析了水电两种流动介质的流动特性,通过理论探讨和实验,揭示了存在问题的原因,提出了电模拟和平面径向流中各参数(供给半径,导电液浓度,电源频率)的合理选择原则,以保证理论在实际运用中更加切合实际情况。     

基于宏观交通流模型的行程时间预测

以高速道路为研究对象，概述了宏观交通模型的基本方程，提出了一种基于宏观交通模拟的路径行程时间预测方法．预测方法以宏观模型输出的速度为基础计算路径行程时间，能够考虑交通拥堵以确保行程时间预测结果更合理．预测方法包含一般计算方法、由路段行程时间合成的方法（近邻组合法）这两种计算方法，后者用以加快计算速度，确保预测能够适用于较大规模路网．算例分析说明了预测方法的有效性．     

Intimations of everyday life: Ubiquitous computing and the city

Ubiquitous computing seeks to embed computers into our everyday lives in such ways as to render them invisible and allow them to be taken for granted, while social and cultural theories of everyday life have always been interested in rendering the invisible visible and exposing the mundane. Despite these related concerns, social and cultural studies have been almost entirely absent in discussions of the design of ubiquitous technologies. This essay seeks to introduce researchers in both fields to each other, and begin to explore the ways in which collaboration might proceed. By exploring mobile and ubiquitous technologies currently being used to augment our experiences of the city, this paper investigates notions of sociality, spatialization and temporalization as central to our experiences of everyday life, and therefore of interest to the design of ubiquitous computing.