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。     

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.     

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…     

Only connect: teaching, technology and telesis

Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.     

European Community policy and the market

Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.     

一种自适应子融合集成多分类器方法

融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。     

Avoiding semantic and temporal gaps in developing software intensive systems

Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.     

Designing economic np control charts: A programmed simulation approach

This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.     

The development of robot art

Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008     

Explanation and prediction: an architecture for default and abductive reasoning

Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.     

Three Process Perspectives: Organizations, Teams, and People

This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)^SM and Team Software Process (TSP){^SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.     

基于复小波噪声方差显著修正的SAR图像去噪

提出了一种基于复小波域统计建模与噪声方差估计显著性修正相结合的合成孔径雷达(Synthetic Aperture Radar,SAR)图像斑点噪声滤波方法。该方法首先通过对数变换将乘性噪声模型转化为加性噪声模型,然后对变换后的图像进行双树复小波变换(Dualtree Complex Wavelet Transform,DCWT),并对复数小波系数的统计分布进行建模。在此先验分布的基础上,通过运用贝叶斯估计方法从含噪系数中恢复原始系数,达到滤除噪声的目的。实验结果表明该方法在去除噪声的同时保留了图像的细节信息,取得了很好的降噪效果。     

How do children do mathematics with LOGO?

Abstract  This paper considers some results of a study designed to investigate the kinds of mathematical activity undertaken by children (aged between 8 and 11) as they learned to program in LOGO. A model of learning modes is proposed, which attempts to describe the ways in which children used and acquired understanding of the programming/mathematical concepts involved. The remainder of the paper is concerned with discussing the validity and limitations of the model, and its implications for further research and curriculum development.