中国证券市场并购行为绩效的实证分析

企业并购是证券市场上资源配置的重要方式,它对企业经营绩效有着重大的影响。本文在回顾相关文献资料的基础上,采用统计方法对近年来我国证券市场的并购行为进行了分析,得出了不同并购行为所产生的不同并购绩效结果,分析了影响并购绩效的相关因素,并提出了若干改善企业并购绩效的政策建议。     

如何提高考生的解题应试能力--数学考研复习中需注意的几个问题

如何正确利用研究生入学考试这根"指挥棒"引导高校教学工作朝着健康的方向发展,进而对教学质量的提高起到积极的促进作用,这是高校数学教师所面临的新课题.     

我国三种野生稻及两个栽培稻品种叶片表面亚显微结构的观察研究

用扫描电钻对原产中国的3种野生稻、2个栽培稻品种就气孔频度、气孔器孔突、大瘤状乳突及木栓细胞乳突等叶片表面亚显微结构作了比较观察研究。结果显示这些性状具有种的特异性,并且其相似程度与亲缘关系远近有关。     

招标与投标竞争系统决策模型及其应用

招投标理论所研究的首要问题是投标商的投标策略问题,其中最优报价尤为重要。本文利用两种方法-解析法和利润法,解决了独立投标中的最优报价问题。     

Aalen's Linear Model for Sampled Risk Set Data: A Large Sample Study

Borgan and Langholz (1997) describe a method for estimating the parameter functions in Aalen's linear hazard regression model from sampled risk set data. Using a counting process formulation and the martingale central limit theorem, we provide a study of the asymptotic distributional properties of the estimator. The results are applied to study the efficiencies of the nested case-control and counter-matched designs relative to a full cohort analysis.     

电解还原法制乙醛酸工艺条件的研究

本文用自制板框式电解槽对电解还原制备乙醛酸工艺条件，如电解终止时间的判断、电流密度、温度等进行一系列的选择与研究。结果表明，制备含量达78．5％的乙醛酸水溶液，化学收率为89％，电流效率为76－88％。     

高等学校专业技术人员考核的实践与认识

高校科技人员的考核制度是人本管理的一项重要基础工作。该文提出了高校内专业技术人员职务晋升的定性和定量相结合的综合考核方式，并据此提出了对各类专业人员定性和定量综合考核的指标体系。     

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.     

积极参与亚太经济合作进一步提高深圳经济效益

在“深圳速度”的基础上,进一步创造“深圳效益”,是90年代深圳经济发展的中心。本文从第二次世界大战以后区域集团化的形成和发展出发,提出积积参与亚太经济合作,大力发展外向型经济,是提高深圳经济效益的重要方面。文中还结合深圳十年来的建设和大量资料,指出深圳参与亚太经济合作的有利条件、前景和对策。     

论破产法上的无效行为制度和撤销权制度——兼及破产法草案第35条和新破产法草案第25、27条

无效行为制度和撤销权制度是破产法上的两种不同的实体制度.在论述无效行为制度和撤销权制度基本原理的基础上,对我国现行破产法的无效行为制度和新破产法草案中并列规定的无效行为制度和撤销权制度进行评析,以期望新的破产法的早日出台.