一种转炉炼钢动态终点预报的新方法

1　引言转炉炼钢就是将含有较多杂质的铁水与吹入的氧气发生反应 ,达到去除杂质的目的 ,从而获得要求的钢水成分和温度 .目前自动化炼钢的方法是静态控制和以副枪检测信息为基础的动态控制相结合的方法 .动态控制的关键是准确预报转炉炼钢终点温度和碳含量 .文 [1 ]在文 [2 ,3]的基础上采用 RBF神经网络对转炉炼钢终点温度和碳含量进行预报 ,提高了预报精度 .但是 ,终点温度和碳含量受到非定量因素的影响 ,文 [4 ]提出以灰色模型为基础的预报方法 ,由于应用线性回归补偿 ,因而影响预报精度 .本文将灰色模型与RBF神经网络相结合提出新的转…     

应用偏差补偿最小二乘法辨识随机控制系统

本文对文[1]中提出的偏差补偿最小二乘法作了进一步推广,证明了该方法亦可用于辨识有色噪声扰动下的随机控制系统。     

基于粗糙集理论的单背景物体识别

1引言 由波兰Z.Pawlak教授提出的粗糙集(RoughSet)理论[1]作为处理不确定问题的一种有效工具,在数据挖掘、知识发现和粒度计算等领域有着广泛的应用.由于图像有多种获取途径,受其内容复杂性和噪音的影响,图像中目标与图像特征之间的关系经常会出现不确定性,将粗糙集理论用于图形图像的处理和理解是一个新的研究热点.Nguye J.利用粗糙集的分类规则实现了图像的特征提取[2];徐立中等人利用粗糙集的不确定性对像素灰度进行划分,实现了灰度图像的二值分割,达到了图像增强的目的[3],还有文献讨论了彩色图像的分割问题[4];文[5]利用相容粗糙集原理对人脸图像检索进行了预处理,缩小了搜索空间范围[5];此外,文[6]将粗糙集理论用于字符识别上,取得了满意的效果[6].但由于获取图像本身存在"噪声"数据,且随着特征维数的不断扩充,给图像信息处理的实时性和分类器的设计造成了极大不便[7],会影响最终的决策结果,因此,对图像属性的高维空间数据进行约简非常必要.     

九宫排定快速算法的改进

文[2]在文[1]的基础上提出了一个快速求解九宫排定问题的算法,其平均移动次数和最大移动次数均比文[1]少一半以上,效果十分显著。本文对文[2]的算法作再次改进,并对整个算法的复杂度作了进一步的分析,得出了平均移动次数不超过47,最大移动次数为100的结果。     

对时域H∞插值算法误差上界的改进

1 引言 文[1]将文[2]在频域构造的H∞辨识问题推广到时域,提出了直接利用时域观测数据辨识系统传递函数的插值算法,并对这类算法在最坏情况下的H∞辨识误差推导了可计算的上界,该上界比较保守,本文对其进行改进.     

自适应递推去卷滤波器

本文提出了信号去卷的一种新的自适应递推去卷滤波器,它由两部份组成:(1)次优递 推滤波器,推广了Tamura[1]的结果;(2)自适应噪声统计估值器,推广了Sage和Husa[2] 及作者[3]的结果,可应用于油田地震勘探[6,7]和通讯系统[5,8].数值仿真例子说明了所提出的 结果的有效性.     

从参考模型取状态的离散MRAC系统的简便算法

本文改进了文[1]的离散MRAC系统简便算法,提出的新算法不仅去掉了关于被控对象增益参数b_0的限制条件,而且适用于非最小相位系统,具有简单、易于实现和应用范围广泛等特点。文中采用从参考模型取状态的MRAC技术,因而增强了系统抗噪声能力。并且将文[2,3]的设计方法从相对阶数1≤d≤2且仅适用于最小相位系统的连续情况,推广到相对阶数d≥1的离散情况。仿其结果表明新算法具有良好的控制性能。     

关于区间矩阵的稳定性

文献[1]试图给出由端点矩阵的稳定性来保证区间矩阵的稳定性,文[2,3]指出文[1]的主要结果是错的.本文给出了端点矩阵的稳定性在一定条件下可以保证区间矩阵的稳定性,其结果比文[4]更精确,适用范围更大,且对具有分解的区间矩阵给出了其稳定及不稳定的充分条件.     

基于属性核的遗传约简算法

属性最小约简是NP完全问题,该问题的研究一直被关注.如,以不可分辨矩阵为基础的传统约简方法[1],基于属性重要性的约简方法[1]等等,这些方法对于大数据集都是不实用的.文[8]提出了以遗传算法全局搜手能力为基础的属性约简方法,文[3]通过引进属性依赖启发信息改进了文[8]中的方法.本文中,先给出了一个时间复杂度为O(k×n×log n),空间复杂度为O(n)的核属性判别方法.然后,以此为基础给出了较文[3]和文[8]中更有效的遗传粗糙约简算法.     

关于非线性时滞系统的鲁棒稳定性条件的讨论

1　引　言在《自动化学报》1 999年第 6期中 ,短文“非线性时滞系统的稳定性分析及鲁棒稳定性分析”[1 ] 用 Lyapunov函数方法分别讨论了确定性和不确定性非线性时滞系统的稳定性 .对于确定性系统得到了一种基于 LMI的渐近稳定充分条件 ,并研究了不确定性系统的鲁棒稳定性问题 .但由于该文对 Razumikhin定理的理解有误 ,有关鲁棒稳定性的结论 (定理 1、推论 1 )是不正确的 .对于 Razumikhin定理 ,文 [2 ]给出了一种所谓的改进型 Razumikhin定理 .但有人提出质疑 ,问题在于没有正确理解 Razumikhin定理 [3,4] .文 [1 ]虽然没有直接提到 R…     

Call for Papers The 6^th International Conference on Grid and Cooperative Computing

Recent years have seen rapid advances in various grid-related technologies, middleware, and applications. The GCC conference has become one of the largest scientific events worldwide in grid and cooperative computing. The 6th international conference on grid and cooperative computing (GCC2007) Sponsored by China Computer Federation (CCF),Institute of Computing Technology, Chinese Academy of Sciences (ICT) and Xinjiang University ,and in Cooperation with IEEE Computer Soceity ,is to be held from August 16 to 18, 2007 in Urumchi, Xinjiang, China.     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

法律信息库系统

本文分析了法律数据库的结构和特点，介绍了采用面向对象设计方法和超文本数据库技术开发和实现法律信息库系统将作为重要网络资源之一为不同用户进行法律咨询服务。     

View-based model-driven architecture for enhancing maintainability of data access services

In modern service-oriented architectures, database access is done by a special type of services, the so-called data access services (DAS). Though, particularly in data-intensive applications, using and developing DAS are very common today, the link between the DAS and their implementation, e.g. a layer of data access objects (DAOs) encapsulating the database queries, still is not sufficiently elaborated, yet. As a result, as the number of DAS grows, finding the desired DAS for reuse and/or associated documentation can become an impossible task. In this paper we focus on bridging this gap between the DAS and their implementation by presenting a view-based, model-driven data access architecture (VMDA) managing models of the DAS, DAOs and database queries in a queryable manner. Our models support tailored views of different stakeholders and are scalable with all types of DAS implementations. In this paper we show that our view-based and model driven architecture approach can enhance software development productivity and maintainability by improving DAS documentation. Moreover, our VMDA opens a wide range of applications such as evaluating DAS usage for DAS performance optimization. Furthermore, we provide tool support and illustrate the applicability of our VMDA in a large-scale case study. Finally, we quantitatively prove that our approach performs with acceptable response times.     

International Journal of Automation and Computing Table of Contents

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Information for authors

正SCIENCE CHINA Information Sciences(Sci China Inf Sci),cosponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China,and published by Science China Press,is committed to publishing highquality,original results of both basic and applied research in all areas of information sciences,including computer science and technology;systems science,control science and engineering(published in Issues with odd numbers);information and communication engineering;electronic science and technology(published in Issues with even numbers).Sci China Inf Sci is published monthly in both print and electronic forms.It is indexed by Academic OneFile,Astrophysics Data System(ADS),CSA,Cabells,Current Contents/Engineering,Computing and Technology,DBLP,Digital Mathematics Registry,Earthquake Engineering Abstracts,Engineering Index,Engineered Materials Abstracts,Gale,Google,INSPEC,Journal Citation Reports/Science Edition,Mathematical Reviews,OCLC,ProQuest,SCOPUS,Science Citation Index Expanded,Summon by Serial Solutions,VINITI,Zentralblatt MATH.     

Erratum to: Fast global kernel fuzzy c-means clustering algorithm for consonant/vowel segmentation of speech signal

正Erratum to:J Zhejiang Univ-Sci C(ComputElectron)2014 15(7):551-563doi:10.1631/jzus.C1300320The original version of this article unfortunately contained mistakes.Algorithm 6 should be as follows:Algorithm 6 FGKFCM-F clustering Input:(1)X={x_1,x_2,…,x_N},,x_iR~d,i=1,2,…,N,the dataset;(2)C,1C≤N,the number of clusters;(3)ε0,the stopping criterion;     

Journal of Zhejiang University-SCIENCE C (Computers & Electronics) Total contents

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A pragmatic multi-method investigation of discrepant technological events: Coping,attributions, and ‘accidental’ learning

Discrepant technological events or situations that entail a problem, a misunderstanding or a difficulty with the Information Technology (IT) being employed, are common in the workplace, and can lead to frustration and avoidance behaviors. Little is known, however, about how individuals cope with these events. This paper examines these events by using a multi-method pragmatic approach informed by coping theory. The results of two studies – a critical incident study and an experiment – serve to build and test, respectively, a theoretical model that posits that individuals use a variety of strategies when dealing with these events: they experience negative emotions, make external attributions, and adopt engagement coping strategies directed at solving the event, eventually switching to a disengagement coping strategy when they feel they have no control over the situation. Furthermore, users’ efforts may result in ‘accidental’ learning as they try to overcome the discrepant IT events through engagement coping. The paper ends with a discussion of the results in light of existing literature, future opportunities for research, and implications for practice.