公共元素模型数据类型的XML Schema描述

AI-ESTATE标准中采用EXPRESS语言对其诊断知识进行描述,但EXPRESS不是程序设计语言,导致采用EXPRESS语言描述的诊断知识难以用程序设计实现,为诊断知识的共享和重用造成了一定困难;XML语言以其良好的灵活性、可读性和可扩展性,为信息交换带来了很大的方便,将EXPRESS语言映射为XML Schema,对诊断知识的共享意义重大.首先,分析了EXPRESS语言和XML Schema的数据类型;然后,分别研究了EXPRESS中简单数据类型、聚合数据类型和构造数据类型到XML数据类型的映射机制;最后,在分析AI-ESTATE标准公共元素模型数据类型的基础上,研究了将公共元素模型的诊断知识用XML Schema标准化描述的过程,实现了诊断知识的可移植和重用.     

一种基于熵的文本相似性计算方法

文本比较是求解两个文本间相似度的过程,文本间的相似度越高代表两个文本越趋于类似。传统的相似度算法主要从字符的角度度量文本的相似性,而忽略了文本内多个共同文本串对于文本相似度的影响。针对此问题,本文提出一种基于熵的相似度求解方法。该方法在对文本间字符信息的提取基础上,建立共同子文本串度量维度,然后采用熵的方法进行相似度度量。实验表明,该方法具有更平滑的相似度曲线,验证了算法的有效性和准确性。     

Continuous output‐feedback control for a class of switched high‐order planar systems and its application

This paper deals with the problem of continuous output‐feedback stabilization for a class of switched high‐order planar systems under arbitrary switchings. Based on the common Lyapunov function design method, by using the adding a power integrator technique and designing an implementable observer, a continuous output‐feedback controller is constructed such that the closed‐loop system is global stabilization and the output can be regulated to the origin. As an application, the developed strategy is utilized to the control design for the continuous stirred tank reactor with two modes feed stream. The simulation results verify the efficiency of the proposed design scheme. Copyright © 2017 John Wiley & Sons, Ltd.     

基于通用知识的软件设计安全性评估

安全性作为软件系统的重要属性,越来越受到人们的重视．在软件开发的早期对安全性进行评估,对软件的质量控制和成本控制有着重要意义．当前的软件安全性评估主要依靠专家评审,结果的客观性及准确性常常受到专家主观意见的影响．通过使用通用知识作为评估依据,提出一种可以对UML顺序图形式的软件设计文档进行自动化分析的方法,可以发现软件设计中潜在的安全性漏洞．该方法可以减少结果中的主观性,同时,通过基于该方法的辅助工具的使用,可以大大提高评估效率．     

混合视觉系统中共同视场的确定与3维重建方法

利用一个单目摄像机和一个全景摄像机搭建了相应的混合视觉系统,通过分析两者的对极几何关系,提出该系统共同视场的确定方法.在此基础上完成共同视场中场景SIFT特征的提取,并以SIFT描述器向量之间的夹角为约束条件进行特征点间的初次匹配,然后利用外极线约束消除初次匹配中的误匹配,从而获得正确的特征匹配关系,由此完成局部场景的...     

Implementation of a prototype VoIP system

VoIP(Voice over IP) is a rapidly growing area with great market potential.To promote it for both commerical and research purposes,a prototype VoIP system based on state-of -the -art otorola communication techniques has been developed.It is a gateway system integrating a PBX and a VoIP module.All components that H.323 defines to supprot VoIP are implemented in the VoIP module,though in a simplified manner,As an embedded system,the system features realtimeness and task distributiveness.A number of addiitonal techniques are used to improve the performance,including noise suppression,zero copy,and buffer structure optimization.When refined in interoperability,the system will also readily serve as a product.     

一种新型的霓虹灯扫描控制器

介绍一种用8031(8051)串口,联级新型的共阴极驱动芯片— —MAX7219霓虹灯扫描控制器。着重论述了该芯片的硬件特点、使用方法及软件编制方法, 给出了用该芯片驱动多点霓虹灯变压器的实例。     

中国传统人居的生态设计思想及其价值探析

中国传统人居中蕴含着丰富的生态设计思想,其一是合理有效利用自然生态环境,其二是追求天人合一生态和谐。反映了中国农业社会渴望与自然融为一体,人伦和谐的生态生活方式。它涵养及衍生的传统天地人和谐理论,给我们保护和恢复人居环境的自然生态,创造宜人的居住环境提供了智慧,并将不断提供有益的启迪与思考。     

一类线性切换系统的鲁棒状态反馈镇定

考虑一类标称系统存在共同Lyapunov函数的切换系统的鲁棒镇定问题.在不确定性不满足匹配条件下,设计出鲁棒状态反馈控制器,并在给定的切换策略下,确保闭环系统在其平衡点处渐近稳定.仿真结果表明所设计控制器是有效的.     

Organizational Problems of Water Distribution in Khorezm,Uzbekistan

Abstract

The paper addresses problems of water resource management on the district and provincial level in the Khorezm province, Uzbekistan. The district water organizations are responsible for equitable water distribution to the agricultural users. These organizations do not have the necessary logistical capacities to manage the water resources nor to control water utilization at the local level. Over-extraction and the lack of control are leading to common pool resource problems at the district level. Furthermore, the concept of administrational management of water resources at the district level, instead of hydrological management increases the problems of equitable water distribution on the provincial, national, and international level.