非负矩阵的谱半径配置问题

给定非负矩阵Ａ，求非负对角矩阵Ｘ，使得Ａ＋Ｘ及其各阶顺序主子阵均具有预先指定的谱半径．给出该问题有解的充分必要条件、解的唯一性及算法     

LS-SVM和BP算法在逆模型控制中的对比研究

最小二乘支持向量机（least squares support vector machine,LS—SVM）具有很好的非线形逼近能力和泛化能力,通过研究逆模型存在的条件,提出了基于LS—SVM的逆模型辨识方法。仿真结果表明基于LS—SVM的逆模型辨识方法在处理非线性对象时,辨识精度、辨识速度、泛化能力都要强于BP算法。     

添加约束的EKF-SLAM算法

为了得到较高的估计精度,基于扩展卡尔曼滤波的同时定位与地图生成算法(EKF-SLAM)需要完成多次路径闭合.这不仅消耗大量的时间与能量,而且增大了机器人发生故障的概率.本文提出一种添加约束的EKF-SLAM算法.该算法通过分析协方差矩阵确定目标路标对,用测量信息与全局先验方向对原估计结果进行约束,能够极大改善估计效果,兼顾高效率与高精度.实验结果及其分析充分表明了算法的有效性.     

我国竞争情报研究的可视化分析

文章利用信息计量、共引分析、共现分析、信息可视化、社会网络分析等方法,借助CiteSpace信息可视化软件和Ucinet社会网络分析软件,对我国竞争情报研究领域发表的学术论文进行了定量分析,绘制了文献共引、作者共现和关键词共现图谱,直观地展示了我国竞争情报研究的热点领域、核心群体和代表文献。     

本体映射系统研究综述

本文以Falcon-AO等4个本体映射系统作为代表,剖析了这些系统的组成、映射过程及特点。在此基础上,提出了本体映射系统参考模型,作为未来本体映射系统开发的一个基本框架。     

排列组合与映射的关系

本给出了排列组合与映射之间的各种关系，揭示了它们之间的本质上的联系。     

基于直接寻找法的电阻抗断层成像

Solution to impedance distribution in electrical impedance tomography （EIT） is an ill-posed nonlinear inverse problem. It is especially difficult to reconstruct an EIT image in the center area of a measured object. Tikhonov regularization with some prior information is a sound regnlarization method for static electrical impedance tomography under the condition that some true impedance distribution information is known a priori. This paper presents a direct search method （DSM） as pretreatment of image reconstruction through which one not only can construct a regularization matrix which may locate in areas of impedance change, but also can obtain an initial impedance distribution more similar to the true impedance distribution, as well as better current modes which can better distinguish the initial distribution and the true distribution. Simulation results indicate that, by using DSM, resolution in the center area of the measured object can be improved significantly.     

关于逆序列的极限空间

讨论了当逆系统为一逆序列时其极限空间的性质，证明了任一逆序列的极限空间与任一无穷的子逆序列的极限空间是同胚的。     

Mitigating the Effects of Poverty and Crime: the Long-Term Effects of an Early Intervention Programme for Children who were Developmentally Delayed and Prenatally Exposed to Cocaine

This study explores the long-term impact on participation in the Linda Ray Intervention Program (LRIP) for children (n = 54) who were developmentally delayed and prenatally exposed to cocaine. By identifying a group of programme graduates from a high crime/high poverty neighbourhood in Miami-Dade County using ArcGIS 10.2 software, a quasi-experimental design was used to compare children living in this area who participated in the centre-based modality (5 h a day; 5 days a week) to children living in this area who participated in the home-based modality (3 h per week) on their Florida Comprehensive Assessment Test (FCAT) reading and math scale scores in public school. The children who participated in the centre-based modality reported stronger outcomes in both math and reading FCAT scale scores at the p < .05 level and also out-performed their school-age peers on both math and reading FCAT scores at the p < .05 level.     

基于Django的数据持久化研究

使用对象关系映射技术将面向对象技术和关系数据库相结合,以解决对象和关系模型之间的＂阻抗不匹配＂问题。本文分析了对象关系映射技术,并以毕业生论文（设计）管理系统为例,给出了Django的数据持久化解决方案,降低了系统的耦合度,保证了系统的可扩展性。