DCS,变中求进

2009年,受全球性金融危机的影响,同时在国家政策调整下,许多产能过剩的行业如火电、冶金、水泥、化工等新项目投资受限,中国DCS市场的整体规模相比较与前几年的高速发展相比下滑比较明显.从目前来看,随着中国经济的复苏,2010年DCS市场的整体规模与2009年相比将会有一定的增长,但DCS市场仍然未能恢复到几年前的高速发展水平.在如此的市场之变下,DCS厂商正在寻求怎样的未来发展之道?本期四位极具代表性DCS厂商专家的分析为我们展现了DCS未来"变中求进"的理念,这其中蕴含着技术发展的变化、服务理念的变化……     

DOS,变中求进

2009年,受全球性金融危机的影响,同时在国家政策调整下,许多产能过剩的行业如火电、冶金、水泥、化工等新项目投资受限,中国DCS市场的整体规模相比较与前几年的高速发展相比下滑比较明显。从目前来看,随着中国经济的复苏,2010年DCS市场的整体规模与2009年相比将会有一定的增长,但DCS市场仍然未能恢复到几年前的高速发展水平。在如此的市场之变下,DCS厂商正在寻求怎样的未来发展之道？本期四位极具代表性DCS厂商专家的分析为我们展现了DCS未来＂变中求进＂的理念,这其中蕴含着技术发展的变化、服务理念的变化……     

DCS，市场之变

20世纪80年代,中国引进第一套DCS控制系统并成功应用。经过30多年的发展,中国庞大而成体系的流程工业形成了过程控制系统的市场基础,在电力、石化、化工、建材、造纸、市政、冶金等众多行业, DCS已成为主流控制系统,中国DCS市场也已进入了一个相对成熟稳定、行业细分的时期。30年间,DCS技术在不断升级换代,中国DCS市场格局也在不断地发生着演变。     

论道DCS之新发展

《自动化博览》:经过这么多年的发展,您认为中国DCS市场的发展现状和应用情况如何?韩晨:发展现状:?经过多年的发展,中国DCS市场目前已经进入了一个相对成熟稳定、行业细分的时期,在一些主要的过程行业如石油     

DOS技术发展进入第四代

在工业企业中,应用效益最直接、最明显的系统应当是工业控制系统,特别是DCS(分布式控制系统)。尽管若干年以前,就有人判定DCS即将被FCS(现场总线控制系统)所取代,然而直至今日,DCS仍然具有相当的生命力。 ARC咨询机构2003年发布了世界DCS市场预测报告。该报告预测,世界DCS市场从2002年至2007年将保持2.5％的增长,从2003年的91亿美元增长到103亿美元。DCS的发展速度之所以不     

海外速递

亚洲DCS市场中制造业的大量投资增长迅猛,电力行业持续发展,批处理控制系统的发展,     

最新DCS的体系结构和技术特点第五讲国内DCS的发展状况举例

国外的DCS一问世，很快就被引入了中国。同时国内很多仁人志士都希望有一天能够研制出自己的DCS。可喜的是从20世纪90年代初国内同时产生了一些DCS厂商，经过十年的市场洗礼，有几家不仅生存下来，而且还得到了快速的发展。由于国内的DCS厂家起步晚，投资少，而且还时刻面临着生存与发展的矛盾，以及用户的期待，所以，他们必须不断创新，     

中国DCS市场增长分析

1 增长概述以及未来3年市场预期 2005年,中国DCS市场整体业务继续保持稳定增长趋势,总体规模达到62亿元,增长率保持较高水平,比2004年增长19.2%.经济过热以及投资的持续是中国DCS市场增长的基础原因.具体到行业需求市场,可以看到,电力、石化行业的业务增长是拉动2005年中国DCS市场的主要驱动因素.     

《2005中国DCS市场研究报告》摘要

0 前言 2005年1月至6月，中国工控网通过超过300个深入访谈，将用户、系统集成商、供应商以及业内专家对市场现状以及未来发展的判断予以了汇总和分析，形成了《2005中国DCS市场研究报告》。期望能够站在一个观察者的角度上，以工控网的资源集群智，用专业的方法剔谜障，为大家呈现出一个能够在相当程度上反映中国DCS市场状况的研究报告。     

《2005中国DCS市场研究报告》摘要

2005年1月至6月,中国工控网通过超过300个深入访谈,将用户、系统集成商、供应商以及业内专家对市场现状以及未来发展的判断予以了汇总和分析,形成了《2005中国DCS市场研究报告》。期望能够站在一个观察的角度上,以工控网的资源集群智,用专业的方法剔谜障,为大家呈现出一个能够在相当程度上反映中国DCS市场状况的研究报告。     

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.