Localization based switching adaptive control for time-varyingdiscrete-time systems

In this paper a new systematic switching control approach to adaptive stabilization of linear time-varying (LTV) discrete-time systems is presented. A feature of the localization based method is its high model falsification capability, which in the case of LTI systems is manifested as the rapid convergence of the switching controller. We believe that the proposed method may help pave the way for design of practical adaptive switching controllers applicable to a wide range of linear time-invariant and time-varying systems     

磁盘阵列附网存储技术研究

附网存储设备（ＮＡＳＰ ｎｅｔｗｏｒｋ ａｔｔａｃｈｅｄ ｓｔｏｒａｇｅ ｐｅｒｉｐｈｅｒｉａｎｃｅ）需要三方通信协议的支持,以这种设备构成的网络存储系统结构不同于传统的客户服务器结构,它在驱动程序级分离数据和命令,建立存储子系统与客户机间的直接联系通道,将服务器从管理每个客户的数据传输中解放出来。该文介绍了附网存储系统的一种实现方式及其读写技术。     

基于主控流动的多级Multi-Agent系统

从分析人的思维活动着手,提出了模拟人类智能活动过程构筑Ｍｕｌｔｉ－Ａｇｅｎｔ系统的方法,并由该方法构造了基于主控流动的多级Ｍｕｌｔｉ－Ａｇｅｎｔ系统。其主要特点是把小 Ｍｕｌｔｉ－Ａｇｅｎｔ系统视为一个特殊的Ａｇｅｎｔ,并由这种特殊的Ａｇｅｎｔ组成更高一级的Ａｇｅｎｔ系统…从而形成多级Ｍｕｌｔｉ－Ａｇｅｎｔ系统,而且在每一级Ａｇｅｎｔ系统中均采用了主控流动策略,使得整个系统能够把巨量的Ａｇｅｎｔ有效地结合起来。系统效率高,能主动改变和适应环境,为设计具体的大规模Ｍｕｌｔｉ－Ａｇｅｎｔ系统提供了一种可行的解决方案。     

一种中文文档的非受限无词典抽词方法

本文提出了一种非受限无词典抽词模型,该模型通过自增长算法获取中文文档中的汉字结合模式,并引入支持度、置信度等概念来筛选词条。实验表明:在无需词典支持和利用语料库学习的前提下,该算法能够快速、准确地抽取中文文档中的中、高频词条。适于对词条频度敏感,而又对计算速度要求很高的中文信息处理应用,例如实时文档自动分类系统。     

遗传算法在人工神经网络中的应用综述

本文介绍正被逐渐广泛应用的新型的、随机性的全局优化方法－遗传算法,系统地讨论了遗传算法在人工神经网络中的主要应用,实验结果显示了遗传算法快速学习网络权重的能力,并且能够摆脱局部极小点的困扰。     

A technique of three-level thresholding based on probabilitypartition and fuzzy 3-partition

Thresholding is a commonly used technique in image segmentation. Selecting the correct thresholds is a critical issue. In this paper, the relationship between a probability partition (PP) and a fuzzy c-partition (FP) in thresholding is given. This relationship and the entropy approach are used to derive a thresholding technique to select the best fuzzy c-partition. The measure of the selection quality is the compatibility between the FP and the PP generated by the problem. An entropy function defined by the PP and FP is used to measure the compatibility. A necessary condition of the entropy function arriving at a maximum is derived. Based on this condition, an efficient algorithm for three-level thresholding is deduced. Experiments to verify the efficiency of the proposed method and comparison to some existing techniques are also presented. The experiment results show that our proposed method gives the best performance in three-level thresholding using fuzzy c-partition     

某型火箭弹半实物仿真系列方案设计－－海鹰仿真工作站的应用

主要介绍半实物仿真的意义、特点,YHSL仿真语言的特点,某型火箭弱是半实物仿真系统组成,以及为配合武器系统研制所设计的系列仿真6方案与某型火箭弹半实物住址系统软件结构及其设计。     

三种新型的VOD系统流服务策略及允许控制算法

本文给出了一种VOD系统流服务策略-SVTR策略,及该策略下的调度算法和允许控制条件,模拟对比测试显示,该策略能有效提高系统的整体利用率和服务容量。     

低成本的U盘数据采集器设计

引言工业现场一般都需要数据采集器来完成各类数据采集任务。在很多实际应用中,往往要求数据采集器具有工作可靠、成本低廉、操作简单、数据便于收集和计算机分析等特点。U盘作为新型移动存储设备,以体积小、速度高、抗震动、通用性强的特点倍受青睐[1]。如果能在嵌入式数据采集系统中实现USB主机功能,那么嵌入式数据采集器就能像PC机一样方便灵活地利用U盘这类USB存储设备进行数据存储。本文以带有片上A/D转换器的C8051F340处理器和USB接口芯片CH375为基础,设计了一款可对100kHz以下的低频模拟信号进行10位深度采样的低成本数据采集器。该数据采集器具有USB主机功能,可将采集的数据以FAT32文件系统格式直接存储到普通U盘中。数据采集完毕后,用户可直接从采集器上取下U盘,利用计算机方便地实现对采集数据的收集和分析处理。下面分别介绍数据采集器系统方案设计和系统软硬件设计。图1数据采集器方案框图1系统方案设计系统方案如图1所示,系统主要由C8051F340单片机和USB接口芯片CH375构成。被测信号首先通过调理电路的抗混叠滤波和限幅处理,然后送给单片机片上A/D转换器进行采样,当采样数据达到一个扇区512字节后...     

Anonymization by Local Recoding in Data with Attribute Hierarchical Taxonomies

Individual privacy will be at risk if a published data set is not properly de-identified. k-anonymity is a major technique to de-identify a data set. Among a number of k-anonymisation schemes, local recoding methods are promising for minimising the distortion of a k-anonymity view. This paper addresses two major issues in local recoding k-anonymisation in attribute hierarchical taxonomies. Firstly, we define a proper distance metric to achieve local recoding generalisation with small distortion. Secondly, we propose a means to control the inconsistency of attribute domains in a generalised view by local recoding. We show experimentally that our proposed local recoding method based on the proposed distance metric produces higher quality k-anonymity tables in three quality measures than a global recoding anonymisation method, Incognito, and a multidimensional recoding anonymisation method, Multi. The proposed inconsistency handling method is able to balance distortion and consistency of a generalised view.