基于g-期望的一些不等式

给出了由倒向随机微分方程定义的g-期望的一些不等式.     

单向变异S-粗集的概率特征

利用单向变异S-粗集的结构,给出元素迁移的概率特征:属性集α的下近似概率特征,属性集α的上近似概率特征,利用这些结果,给出单向变异S-粗集的概率特征,提出单向变异S-粗集的随机结构与随机定理.单向变异S-粗集的结构是单向变异S-粗集的随机结构的特例,单向变异S-粗集的随机结构是单向变异S-粗集结构的一般形式.     

社会需求科技中介发展的推动力

科技中介服务业是现代市场中介体系中新的高层次的部分,主要指咨询业(包括科技、法律、会计、审计、资产评估等)、信息服务业和各类技术服务业等与科技进步相关的高知识含量的新兴行业.     

双频互相干函数及在粗糙面脉冲散射中的应用

基于基尔霍夫近似, 推导了二维随机粗糙面的双频互相干函数的解析表达式. 当粗糙面的曲率半径远大于入射波长时, 由基尔霍夫近似求解粗糙面的散射场. 在考虑窄带脉冲入射条件下, 简化了双频互相干函数的表达式. 数值结果表明粗糙面的高度起伏均方根是主要影响因素, 而相关长度对互相干函数的影响则较小. 最后, 将解析解的结果与蒙特卡罗模拟的结果作了对比, 讨论了解析解的准确性和计算效率.     

A Large Deviation Principle for the Risk Process with Varying Premium

Let u ∈ R ,for any ω 〉 0, the processes X^ε = {X^ε（t）; 0 ≤ t≤ 1} are governed by the following random evolution equations dX^ε（t）= b（X^ε（t）,v（t））dt-εdSt/ε, where S={St; 0≤t≤1} is a compound Poisson process, the process v={v（t）; 0≤t≤1} is independent of S and takes values in R^m. We derive the large deviation principle for{（X^ε,v（.））; ε〉0} when ε↓0 by approximation method and contraction principle, which will be meaningful for us to find out the path property for the risk process of this type.     

Stability Analysis of Stochastic Swarm Systems

In this paper,we present a model of stochastic swarm system and prove the stability of this kind of systems. We establish the stable aggregating behavior for the group using a coordination control scheme. This individual-based control scheme is a combination of attractive and repulsive interactions among the individuals in the group,which ensures the cohesion of the group and collision avoidance among the individuals. The dynamics of each individual depends on the relative positions between the individuals and the influences of the random disturbances. Under the influences of the noises,this position-based control strategy still generates the stable aggregating behavior harmoniously for the group and the self-organized swarm pattern is formed.     

Convergence of Recursive Identification for ARMAX Process with Increasing Variances

The autoregressive moving average exogenous (ARMAX) model is commonly adopted for describing linear stochastic systems driven by colored noise. The model is a finite mixture with the ARMA component and external inputs. In this paper we focus on a parameter estimate of the ARMAX model. Classical modeling methods are usually based on the assumption that the driven noise in the moving average (MA) part has bounded variances, while in the model considered here the variances of noise may increase by a power of log n. The plant parameters are identified by the recursive stochastic gradient algorithm. The diminishing excitation technique and some results of martingale difference theory are adopted in order to prove the convergence of the identification. Finally, some simulations are given to show the reliability of the theoretical results.     

Discrete Time Optimal Adaptive Control for Linear Stochastic Systems

The least-squares (LS) algorithm has been used for system modeling for a long time. Without any excitation conditions, only the convergence rate of the common LS algorithm can be obtained. This paper analyzed the weighted least-squares (WLS) algorithm and described the good properties of the WLS algorithm. The WLS algorithm was then used for adaptive control of linear stochastic systems to show that the linear closed-loop system was globally stable and that the system identification was consistent. Compared to the past optimal adaptive controller, this controller does not impose restricted conditions on the coefficients of the system, such as knowing the first coefficient before the controller. Without any persistent excitation conditions, the analysis shows that, with the regulation of the adaptive control, the closed-loop system was globally stable and the adaptive controller converged to the one-step-ahead optimal controller in some sense.     

高校优秀学生干部——未来青年领导管理人才能力需求研究

高校学生干部特别是优秀学生干部是一个比较重要的角色,他们很有可能成为我国未来青年领导管理人才,是未来社会主义建设的栋梁之才,面临着社会各方面的需求。因此,在新时期高校学生干部应具备一定的能力。高等学校是为社会主义现代化建设培养建设者和接班人的重要基地,因此,搞好社会对学生干部的能力需求研究,认识学生干部的能力现状与特征,并有针对性培养这些能力,具有非常重要的意义。     

基于飞行程序模式下终端区容量的计算

本文对空域系统的终端区容量评估问题进行了较为系统的研究和分析,利用Monte-Carlo随机模拟方法,使理论模型与仿真评估相结合,针对现有数据模型,对进近三部分航段进行了系统划分和理论说明,给出了相应速度参考取值,实现了对现有终端区容量评估模型的补充。