人工气候室智能测试系统主机软件设计

人工气候室参数自动测试和智能化信息处理是实现人工气候室现代化管理的重要手段.提出了一种基于CAN总线的人工气候室智能测试系统,介绍了系统构成和主机软件设计,讨论了主机VB与LabVIEW信息资源共享和程序嵌套问题.     

基于无线传感网的人工气候室数据采集系统

随着我国现代农业科技的发展,人工气候室作为一种可控环境实验室,越来越多地应用于作物培育、良种选育等领域,而对小气候要素的高精度、实时数据采集也显得越来越重要。在传统的人工气候室数据采集传输系统中,由于节点数量大且密集,给系统的布线和维护带来很大的困难。针对这些问题,文中提出了一种基于无线传感网的人工气候室数据采集系统实现方案,该系统可以非常方便地实现温度、湿度、光照、风速、雨量等气候要素的无线监测。     

基于无线传感网的人工气候室数据采集系统

随着我国现代农业科技的发展,人工气候室作为一种可控环境实验室,越来越多地应用于作物培育、良种选育等领域,而对小气候要素的高精度、实时数据采集也显得越来越重要。在传统的人工气候室数据采集传输系统中,由于节点数量大且密集,给系统的布线和维护带来很大的困难。针对这些问题,文中提出了一种基于无线传感网的人工气候室数据采集系统实现方案,该系统可以非常方便地实现温度、湿度、光照、风速、雨量等气候要素的无线监测。     

人工气候室通信系统的可靠性设计

可靠性设计是系统设计的关键技术.人工气候室为实现对各状态参数的自动测试和控制,必须设计和构建安全可靠的通信系统.从硬件和软件两方面讨论了人工气候室通信系统的设计原理和实现方法.实际应用表明,通信系统安全可靠,参数测量准确.     

飞机气候环境实验室分布式测试系统研究

测试系统作为飞机气候环境实验室的关键子系统,用于跟踪记录飞机子系统的试验环境条件及运行状态信息数据,为系统故障分析、确定故障处理动作,以及飞机改装设计提供数据支持.飞机整机气候试验中存在测试参数种类多、数据量大、总采样率高、测量点分布范围广的特点,造成试验效率低、布线复杂、试验成本高的问题.为解决这些问题,重点讨论了系统架构组成、功能,以及设计要点,提出了适用于气候环境实验室的网络化分布式测试系统,为气候环境实验室测试系统的设计实施提供了支持.     

基于AT89C51的湿度检测系统设计与研究

人工气候室如今已广泛应用于工农业生产的许多方面。在人们的日常生活中,人工气候室的湿度参数直接影响着人的居住环境和身体健康。本文以计算机智能监控人工气候室的研究为背景,针对目前在湿度检测方面存在的问题,对湿度检测系统的测量原理和单片机AT89C51的硬件控制电路以及湿度的控制方法进行了研究并设计出这一系统的实现方案。实验结果表明该系统的可靠性高,而且易于控制,具有较好的实用价值。     

基于专家知识的人工气候室控制系统设计

介绍了小型人工气候室主要控制特点与相应的控制策略,以及基于专家知识的小型人工气候室控制系统及控制算法的设计,讨论了进行温度控制的方法及参数的设定方法;控制算法采用自整定PID控制技术并设计出PID控制器,同时对硬件采用模块化设计思想,方案简单易行;设计出的温湿度控制方案能拟合专家知识库中生物生长曲线,符合生物生长需要;人性化的人机交互界面方便操作;最后给出的仿真图像表明能使温度控制在一定精度范围内,效果良好。     

面向集散式人工气候室智能监控系统的人机界面设计

随着人工气候室技术的推广,设计简便友好的人机界面成为提高人工气候室智能监控系统效率的关键.在提出集散式人工气候室智能监控系统的基础上,设计实现了系统上位机(PC端)和下位机主机端人机界面.其中上位机PC端人机界面采用Windows/VC6.0实现.下位机主机端人机界面采用19264图形点阵液晶屏配合按键在双串口芯片W77E58的控制下实现,并给出了主机端人机界面的软件设计方法.采用此人机界面使得系统操作更加简便直观.     

多路LCR参数自动测试分析系统的开发

介绍了LCR参数测试分析系统的硬软件系统的设计与实现。系统以计算机和单片机控制器为核心,结合专门开发的测试和数据分析软件,实现LCR温度特性、频率特性的多通道自动测试和数据处理,克服了传统人工测试费时、重复性差、数据分析困难、检测环境难以控制等问题。     

人工气候室控制系统设计

设计开发了一种基于PLC和触摸屏的人工气候室系统,用来模拟温度、湿度、CO2浓度,光照强度等自然条件;详细描述了系统的硬件组成及软件设计,实现了短信报警、网络监控等扩展功能;设计了一套逻辑控制算法,解决了人工气候室惯性、大滞后等问题,实现了对气象因子的精确控制;经过实地测试表明,温度控制精度为±0.5℃,湿度控制精度为±5%rh,CO2浓度控制精度为±30ppm,均达到了控制要求。     

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.