基于自组织理论的东北老工业基地煤矿衰退演变规律研究

主要利用自组织行为理论,对非线性系统中煤矿衰退产生、形成、发展以及衰退的动态演化过程加以描述与分析,从而探讨老工业基地可持续发展的演变规律.同时把这一理论应用于煤矿产业市场,说明了东北老工业基地煤矿衰退过程,就是一个不确定行为本质特征的复杂系统的自组织行为.在此基础上,对东北老工业基地煤矿产业衰退的防范给出了产业结构调整、非煤产业开发的建议.     

论科技期刊核心竞争力及其提升途径

明了科技期刊的核心竞争力是必要的,更重要的是在此基础上找寻提升途径.其途径主要包括以下5个方面:差异化的市场定位;优质特色化的内容与表现形式;优秀的人才资源;深度个性化的文化积淀;赋予现代气息的营销策略和服务理念.     

Admissible model noise upper bound with constraint of stochastic passage characteristics

In some object tracking systems,the moving object future position is an area (i.e.,target area).It is a successful estimation strategy if the predicted points fall in the target area.If the object makes a sudden maneuvering,the prediction may get out of the target area easily which may make the tracking system lose the object.The aim is to investigate the admissible maximum object maneuvering intensity,which is characterized as model noise variance,for such kind of tracking system.Firstly,the concept of stochastic passage characteristics over the boundary of target area and their relationship with prediction error variance are described.Secondly,the consistency among the indices of regional pole,prediction error variance and stochastic passage characteristics is analyzed.Thirdly,the multi-indices constraints are characterized by a set of bi-linear matrix inequalities (BMIs).Then,the admissible maximum model noise variance and the satisfactory estimation strategy are presented by iteratively solving linear matrix inequalities (LMIs) to approximate BMIs.Finally,a numerical example is proposed to demonstrate the obtained results.     

The effects of redundant control inputs in finite-time optimal control

This paper is concerned with the effects of redundant control inputs on the quadratic optimal performance index in finite-time optimal control. Actually, the effects of redundant control input on quadratic performance index is equal to study the effects of the redundant control input on the solution of Riccati differential equation (RDE). Hence, some sufficient conditions are presented to strictly decrease the solution of RDE with the column of input matrix increased. Especially, a necessary and sufficient condition is derived to strictly decrease the solution of the homogeneous RDE after control input extensions. Moreover, one sufficient condition is obtained, which guarantees that the minimum control energy index strictly decreases with input extension. It is shown that redundant control inputs can improve the system performance based on these results. Some examples are taken to illustrate the effectiveness of related problems.     

层状纤维──手征复合材料对平面电磁波的屏蔽特性

本文应用广义谱域指数矩阵方法，研究了分层纤维──手征复合材料对入射平面电磁波的反射和透射特性。数值结果表明，由于非互易和手征参数的引入，在一定程度上可以改善层状各向异性纤维复合材料对平面电磁波的屏蔽性能。     

Two improved algorithms and implementation for a singularly perturbed problem on moving meshes

This paper applies a difference scheme to a singularly perturbed problem. The authors provide two algorithms on moving mesh methods by using Richardson extrapolation which can improve the accuracy of numerical solution. In traditional algorithms of moving meshes, the initial mesh is a uniform mesh. The authors change it to Bakhvalov-Shishkin mesh, and prove that it improves efficiency by numerical experiments. Finally, the results of the two algorithms are analyzed.     

自组织特征映射神经网络权值的实现

本文根据自组织特征映射神经网络学习算法，提出了其权值的ＣＭＯＳ实现电路。该电路结构简单，动态范围宽，易于集成实现。学习速度可达５０万次每秒。用ＣＭＯＳ１．２μ工艺实现电路的ＰＳＰＩＣＥ５．０仿真，表明该电路具有较好的工作性能。     

企业集约经济效益的分析与评价

从寻找影响企业集约经济效益的因素入手,建立了集约因素贡献率及其经济效益的数学模型,进而实现了集约经营效果的度量