上市公司经营者继任的绩效意义

经营者的继任及其继任形式对公司的市场绩效具有影响,体现在股价即时变动的信号效应和公司系统风险水平发生变更的管理效应上。本文对沪深300指数成份股公司2001-2003年的301例董事长和总经理继任事件,用事件研究方法分析了经营者继任的信号效应,用邹检验识别了经营者继任的管理效应。研究表明,经营者继任形式是影响信号效应的重要因素,而经营者继任事件导致的管理效应是普遍存在的。另外,与国外同类研究的比较表明,中外上市公司经营者继任的绩效意义既有相似之处,也有不同之处。     

资本结构治理效应:中国上市公司的实证研究

资本结构影响公司治理的结果最终会体现在公司绩效的变化上。本文通过对1992-2004年间我国上市公司资本结构影响公司绩效的实证分析发现:资产主营业务净利润率、经营费用率和资产利用率三个指标比股票价值能更好地解释资本结构对公司绩效的影响;国家股比例对公司绩效的负向影响越来越不显著;法人股比例和负债融资比例对公司绩效有不显著的正向影响等。这些结论表明,完善资本结构是完善我国上市公司治理结构从而提高公司绩效的重要途径之一。     

WTO框架下会计国际化的中国困境与创新

本文通过分析WTO对各国会计制度的要求,探讨了WTO框架下中国会计国际化所带来的四大困境；并试图从制度变迁成本的角度,提出了以制度借鉴为主线的中国会计国际化创新战略的基本原则,进一步给出了中国会计国际化创新战略实施的路径设计图。文章认为,充分利用国际会计资源解决我国的现实问题,减少我国会计国际化变迁的成本,应该是后WTO时代中国会计国际化制度困境突破与创新的基本路径取向。     

施工索赔机会发现的描述与求解方法

施工索赔机会发现是索赔管理的核心和关键内容,是索赔决策的瓶颈环节。分析了施工索赔机会发现的信息结构,给出了其灰描述,研究了施工索赔机会发现的两种求解方法,研究了索赔机会发现支持系统的工作机制。     

基于反向物流的商品定价和退货政策研究

综述了基于反向物流的商品定价和退货政策的最新研究成果。在此基础上,通过建立模型,对基于反向物流的商品定价策略和退货政策进行了进一步的研究,并求出了商品的最优价格和最优退货价格。基于模型,对管理提出了一些建议。最后指出了将来可能的研究方向。     

中国地级城市投资环境评价研究

外商直接投资在我国不同城市的分布极不平衡,投资环境差异是造成该现象的主要原因。为此提出了城市投资环境评价的指标体系,通过对全国167个城市的数据进行因子分析,研究和评价了各城市的投资环境,并从实证的角度,验证了投资环境与FD I以及GDP的结构关系。     

基于集成供应的RS契约协调模型研究

在由供应商和制造商组成的两级供应链中引入集成商,研究了需求不确定且价格敏感条件下基于集成供应的3级供应链的协调问题,建立了满足渠道协调条件和集成供应条件的RS契约协调模型,给出了模型中RS契约参数的取值范围和取值过程,并用实例加以说明。利用模型不仅可以确定产品的生产量和销售价格,而且还可以通过RS契约参数实现供应链利润的分配。     

家族企业可持续发展的路径选择研究

家族企业在全世界经济中占有重要地位。从各个不同角度研究家族企业可持续发展的理论问题,介绍家族企业可持续发展路径选择的SHEMP理论,并且探讨了此种路径选择与环境的关系:从宏观的角度进行家族企业可持续发展的PEST分析,进而提出在现有融资环境、诚信环境和职业经理人市场条件下,我国家族企业的选择路径。     

Reliable Ad Hoc Routing Based on Mobility Prediction

Reliability is a very important issue in Mobile Ad hoc NETworks (MANETs). Shortest paths are usually used to route packets in MANETs. However, a shortest path may fail quickly, because some of the wireless links along a shortest path may be broken shortly after the path is established due to mobility of mobile nodes. Rediscovering routes may result in substantial data loss and message exchange overhead. In this paper, we study reliable ad hoc routing in the urban environment. Specifically, we formulate and study two optimization problems. In the minimum Cost Duration-bounded Path (CDP) routing problem, we seek a minimum cost source to destination path with duration no less than a given threshold. In the maximum Duration Cost-bounded Path (DCP) routing problem, we seek a maximum duration source to destination path with cost no greater than a given threshold. We use a waypoint graph to model the working area of a MANET and present an offline algorithm to compute a duration prediction table for the given waypoint graph. An entry in the duration prediction table contains the guaranteed worst-case duration of the corresponding wireless link. We then present an efficient algorithm which computes a minimum cost duration-bounded path, using the information provided in the duration prediction table. We also present a heuristic algorithm for the DCP routing problem. In addition, we show that the proposed prediction and routing schemes can be easily applied for designing reliable ad hoc routing protocols. Simulation results show that our mobility prediction based routing algorithms lead to higher network throughput and longer average path duration, compared with the shortest path routing. This research was supported in part by ARO grant W911NF-04-1-0385 and NSF grant CCF-0431167. The information reported here does not reflect the position or the policy of the federal government.     

Energy conservation through resource-aware movement in heterogeneous mobile ad hoc networks

Energy conservation in mobile ad hoc networks is of paramount importance because most mobile nodes usually have very limited energy supply. Previous research on this issue focused on the design at the network or MAC or physical layer. In this paper, we study this problem from the new perspective of node mobility, i.e., analyzing the impact of node movement on energy conservation. In particular, armed with the inherent resource heterogeneity in mobile ad hoc networks, we propose a novel resource-aware movement strategy to make better use of some powerful nodes to achieve energy conservation. We also formulate the resource-aware movement as a NP-complete distance-constrained least-cost (DCLC) routing problem and propose an efficient heuristic solution. Extensive simulations have been used to demonstrate the effectiveness of the proposed schemes.