VB实现PC机与单片机(8051)的串行通讯

本文主要论述PC机与单片机之间实现异步串行通讯需要解决的问题以及如何利用VB提供的串行通讯控件MSComm来实现PC机与51单片机的通讯.     

基于MSComm控件的发动机运行监控系统串行通信研究

本文研究了MSComm控件在开发摩托车发动机监控系统数据采集模块中的数据通讯模式。利用VB6．0ActiveX中的MSComm通信控件,实现了Windows下单台PC机与主控单片机的串行通信,实现了电控汽油机运行参数的可视化,为电控汽油机控制参数的优化匹配提供了依据。     

基于RS-485总线的汽车四轮定位仪通讯功能的实现

汽车四轮定位仪为一分布式计算机测控系统,本文介绍了通过RS-485总线并利用VB 6.0 ActiveX控件的MSComm通讯控件,实现了汽车四轮定位仪中单台PC机与多台单片机的通讯功能.     

用MSComm实现PC与多单片机间的串行通信

介绍了Visual Basic的串行通讯控件MSComm的属性和使用方法,同时以智能家居安防报警系统为例,介绍了计算机与多单片机之间串行通讯的连接方法,给出了利用MSComm控件编程实现数据发送和接收的部分程序,以及单片机中断服务程序框图。     

基于RS-485总线的汽车四轮定位仪通讯功能的实现

汽车四轮定位仪为一分布式计算机测控系统,本文介绍了通过RS-485总线并利用VB6.0ActiveX控件的MSComm通讯控件,实现了汽车四轮定位仪中单台PC机与多台单片机的通讯功能。     

串行通信在实时数据采集中的应用

本文讨论了VB 6.0 MSComm控件在数据采集中的应用。利用VB6.0 ActiveX中的MSComm通信控件,实现了Windows下单台PC机与多台计量仪表的串行通信,达到了以较低的硬件成本对多路数据自动采集、计算和分析的目的。     

AT89C52单片机与VB串行通信的实现

介绍了AT89C52单片机与PC机串行通信的实现方法，串行存储器24C256的读写操作流程。并给出了具体通信接口电路、单片机串行通信程序流程以及利用VB6．0的通信控件MSComm实现PC机串行通信的程序。系统经过实际应用，效果令人满意。     

基于PC和PLC的分布式监控系统

以工控PC机作主控上位机,利用VB6 .0的MSComm串行通信控件实现了在Win2 0 0 0环境下与Master K12 0SPLC的串行通信,完成对多台PLC(下位机)的控制,利用工控PC机强大的数据处理性能实现对监控结果的集中管理和优化。     

利用MsComm实现单片机与PC机的串行通信

单片机与PC机的串行通信在许多领域得到了广泛的应用。通常单片机完成数据的采集,然后用异步串行通信方式传给PC机。文章主要介绍在VB6.0环境下,利用通信控件MSComm来实现单片机与PC机串行通信的方法。     

用VC实现地物光谱辐射信号的虚拟串口通讯

本文探讨VC＋＋6.0下利用MSComm控件进行PC机与地物光谱辐射测量仪器（单片机）之间的串口通讯,该串口是由硬件通讯模块产生的一个虚拟串行端口.给出了系统组成原理、用户层通讯协议以及串口通讯的关键代码.     

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。     

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.     

Editorial: Special issue on recent advances in hybrid control theory and applications

正The demands of a rapidly advancing technology for faster and more accurate controllers have always had a strong influence on the progress of automatic control theory.In recent years control problems have been arising with increasing frequency in widely different areas,which cannot be addressed using conventional control techniques.The principal reason for this is the fact that a highly competitive economy is forcing systems to operate in regimes where     

Information for Authors

正Aim The Journals of Zhejiang University-SCIENCE(A/B/C)areedited by the international board of distinguished Chinese andforeign scientists,and are aimed to present the latest devel-opments and achievements in scientific research in China andoverseas to the world’s scientific circles,especially to stimulateand promote academic exchange between Chinese and for-eign scientists everywhere.     

Enhancing a leaf radiative transfer model to estimate concentrations and in vivo specific absorption coefficients of total carotenoids and chlorophylls a and b from single-needle reflectance and transmittance

The relative concentrations of different pigments within a leaf have significant physiological and spectral consequences. Photosynthesis, light use efficiency, mass and energy exchange, and stress response are dependent on relationships among an ensemble of pigments. This ensemble also determines the visible characteristics of a leaf, which can be measured remotely and used to quantify leaf biochemistry and structure. But current remote sensing approaches are limited in their ability to resolve individual pigments. This paper focuses on the incorporation of three pigments—chlorophyll a, chlorophyll b, and total carotenoids—into the LIBERTY leaf radiative transfer model to better understand relationships between leaf biochemical, biophysical, and spectral properties.Pinus ponderosa and Pinus jeffreyi needles were collected from three sites in the California Sierra Nevada. Hemispheric single-leaf visible reflectance and transmittance and concentrations of chlorophylls a and b and total carotenoids of fresh needles were measured. These data were input to the enhanced LIBERTY model to estimate optical and biochemical properties of pine needles. The enhanced model successfully estimated reflectance (RMSE = 0.0255, BIAS = 0.00477, RMS%E = 16.7%), had variable success estimating transmittance (RMSE = 0.0442, BIAS = 0.0294, RMS%E = 181%), and generated very good estimates of carotenoid concentrations (RMSE = 2.48 µg/cm², BIAS = 0.143 µg/cm², RMS%E = 20.4%), good estimates of chlorophyll a concentrations (RMSE = 10.7 µg/cm², BIAS = − 0.992 µg/cm², RMS%E = 21.1%), and fair estimates of chlorophyll b concentrations (RMSE = 7.49 µg/cm², BIAS = − 2.12 µg/cm², RMS%E = 43.7%). Overall root mean squared errors of reflectance, transmittance, and pigment concentration estimates were lower for the three-pigment model than for the single-pigment model. The algorithm to estimate three in vivo specific absorption coefficients is robust, although estimated values are distorted by inconsistencies in model biophysics. The capacity to invert the model from single-leaf reflectance and transmittance was added to the model so it could be coupled with vegetation canopy models to estimate canopy biochemistry from remotely sensed data.     

Mr. Twinn’s bombes

This article discusses the history and design of the special versions of the bombe key-finding machines used by Britain’s Government Code & Cypher School (GC&CS) during World War II to attack the Enigma traffic of the Abwehr (the German military intelligence service). These special bombes were based on the design of their more numerous counterparts used against the traffic of the German armed services, but differed from them in important ways that highlight the adaptability of the British bombe design, and the power and flexibility of the diagonal board. Also discussed are the changes in the Abwehr indicating system that drove the development of these machines, the ingenious ways in which they were used, and some related developments involving the bombes used by the U.S. Navy’s cryptanalytic unit (OP-20-G).