最优鲁棒容错控制新方法及其在飞行控制中的应用*

本文研究了一类参数不确定且传感器失效的多变量系统的容错控制问题，提出了一种基于模型参数的最优鲁棒容错控制器新的设计方法，该方法可用于解决部分传感器失效时的最优容错控制，并给出了某国产飞机纵向飞行控制的仿真结果。     

基于变控制律方法的智能控制器在空调监控系统中的应用

介绍了一种采用变控制律的新型智能控制器在厂房空调中央监控系统中的应用 ,以取代采用单一 PID控制律的传统空调系统控制器。该系统应用集散控制 ,控制器以 PID控制为基础 ,结合 Fuzzy控制及 Bang-Bang控制技术 ,构成变控制律结构。将该控制器应用于恒温恒湿空气调节中央监控系统控制后 ,可具有控制精度高、响应速度快、对干扰不敏感等优点 ,取得良好的控制效果     

转炉炼钢的顶吹控制

0　引言目前 ,我国钢铁企业中转炉炼钢的顶吹控制通常采用以下两种控制方案 :一是定流量控制 ,即采用定值流量调节系统维持吹炼过程中氧气流量的恒定 ,根据需要设定吹炼时间 ,通过吹炼时钟计量吹炼时间达设定值时吹氧结束 ;另一是定压控制 ,即通过定值压力调节系统维持吹炼过程中氧气吹入压力的恒定 ,吹氧结束依靠设定吹氧量来实现。上述两种控制方案的采用是根据操作人员的操作习惯决定的 ,无论是采用模拟或数字仪表 ,还是DCS ,都很容易实现 ,因此这两种控制方案广泛应用于钢铁企业。随着冶炼工艺的发展和控制系统的更新换代 ,简单的定压…     

空分装置中空压机控制系统的原理与应用

本文详细介绍了空压机的基本控制、不同工况的控制过程、防喘振控制及对电机的控制,进行了控制模式的探讨,分析了空压机运行调试过程中的问题。     

自适应PID切换控制在烧结自动配料系统中的应用

提出一个自适应控制器和一个传统PID控制器相互切换的控制方案,仿真结果表明,该算法辨识精度高,控制性能优、跟踪能力强,是一种简便有效的控制方法,同时该算法应用于烧结过程的自动化控制中,取得了较好的应用效果。     

计算机财务控制与会计信息质量控制

本文鉴于目前我国在计算机辅助财务管理的应用中,多数企业尚停留在会计核算、很少具有系统的财务控制功能,未能发挥出管理上应有作用的现状,提出财务控制功能结构框架,并构思出财务计划、预算和日常对财务收支控制的各种模型以及提高会计信息质量的控制方法.     

单片机控制电容器薄膜张力推理控制系统

给出了一种适用于工程常见的二阶控制对象的推理控制算法,并成功地应用于金属化薄膜电容器全自动卷统机中作为快速张力伺服控制。采用８０９８单片机控制的该推理控制系统具有收剑、无稳态误差以及动态性能好的特点。     

高频增益符号未知时的变结构模型参考自适应控制:任意相对阶的控制律设计

讨论被控对象相对阶大于1且高频增益符号未知时的变结构模型参考自适应控制问题,从而将相对阶为1时的结果推广到任意相对阶.首先对关键信号构造监控函数,并在此基础上提出了一种控制信号切换律.进而证明,当被控对象相对阶大于1、高频增益符号未知时,在监控函数的监测下,相关控制信号经至多有限次切换后将停止切换,跟踪误差将收敛到一个残集内,且该残集可通过减小某些设计参数而变得任意小.特别,本文证明,与相对阶为1时相同,当对象相对阶大于1时,若系统的某些初始条件为零,则至多只需要一次切换.     

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.