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.     

试论战国时期的工商管理思想与工商管理政策

战国时期 ,以《管子》和商鞅、韩非的工商管理思想最具代表性。前者在重视工商业发展的基础上 ,亦强调国家对社会经济的调控 ;后者则多从政治目的出发 ,要求工商业的发展必须无条件地服从政治的需要。这一时期 ,工商管理政策可分为两种类型。其一是东方六国 ,实行较为放任的工商管理政策 ;其二为西方秦国所实施的比较彻底、完整地代表着新兴地主阶级政权利益的、严厉抑制私营工商业发展的管理政策。     

譜分析和滤波兼容的模拟系統

本文利用序列的双重性原理对移动傅立叶变换作了深入的研究.根据频率采样理论,将模拟系统的传递函数H(ω)分解为若干子系统之和,并画出其结构框图,这个系统可以用来测量模拟信号的移动离散谱,也可用作低通、带通或梳状滤波器.最后还给出实现该系统的具体方框图.     

HFC－134a水平管内流动沸腾换热研究的进展

在分析国外有关文献的基础上，对ＨＦＣ－１３４ａ水平管内流动沸腾换热研究的现状和已取得的成果进行了综述，指出了该领域进一步研究的方向．     

加筋壳体振动特性分析方法

分析了解析方法和数值方法在加筋壳体振动特性分析中的应用及两种基本方法的利弊，提出一种改进的分析方法──半解析数值法．