基于VB的实验室设备管理系统

本设计应用可视化开发工具Visual Basic访问Access数据库开发一套现代化的实验室管理系统,本文阐述了基于VB访问Access数据库的方法及设备管理系统的结构和功能。本系统的可移植性强,使实验室管理更加简便快捷。     

VB应用程序动态连接与创建数据库表的实现

讨论在VB数据库开发环境和Access2000数据库管理系统中,如何实现VB应用程序动态创建和连接数据库表。     

基于Web远程教学管理系统设计与实现

通过分析现代远程教学管理系统的系统架构、功能模块、数据库设计等相关知识,在实际开发系统的基础上,论述了设计与实现基于Web远程教学管理系统的方法和相关技术。该系统采用三层的B/S架构模式,包括数据库系统、应用服务器和客户浏览器,选用Access2003作为后台数据库,结合学校现有设备和教学目标,以论坛框架为基础,设计与实现了基于Web远程教学管理系统。     

学生档案管理系统的设计与实现

学生档案管理系统是学校教学管理系统重要的组成部分之一。利用VB6．0,结合Access数据库开发了学生档案管理系统,该系统包括学籍管理、课程管理和用户管理等功能。     

Access应用系统开发研究

Microsoft Access是一款出色的数据库管理工具和最佳的桌面数据库开发系统,本文从MS Office组件适用场合、数据库设计、界面与报表设计、VBA与宏的使用、安全性方面以及多用户应用系统开发策略等方面,论述了在进行Access应用系统实现过程中如何最大程度地发挥Access软件功能,高效地开发Access应用系统。     

职业学校学生诚信教育管理系统的设计与实现

学生诚信教育管理系统是一个简单的数据库管理系统,本文利用微软公司的Visual Basic 6.0程序结合Access 2003开发出了管理系统。根据目前职业教育学校的特点,本系统中主要由班主任和系统管理员操作使用。     

企业销售管理系统的设计与实现

该文介绍了一个物资企业销售管理系统的开发实例。重点从系统结构、业务流程、数据库设计及主要功能模块设计着手,介绍了该系统的设计思路和实现过程。系统选择了SQL Server 2000作为开发平台,并以VB6.0作为开发工具。     

企业采购管理系统的设计与实现

本文介绍了一个物资企业采购管理系统的开发实例。重点从系统结构、业务流程、数据库设计及主要功能模块设计着手,介绍了该系统的设计思路和实现过程。系统选择了SQL Server 2000作为开发平台,并以VB6.0作为开发工具。     

基于ASP的实验室管理系统

为适应目前校园数字信息实验室的管理形式,以实验室信息管理为例,对基于ASP的实验室办公管理系统进行研究,开发了适合校园实验室的信息管理系统,同时对实验室管理系统的网络化实现进行了系统的研究,初步实现了实验室办公管理系统的无纸化和网络化办公;介绍了基于ASP的实验室管理系统的设计方法和实现技术,对系统进行了分析和功能设计,把系统分成若干层次的模块,进而提出了Web数据库编程的解决方案:应用ASP、ADO和Access,最后给出了部分源代码。     

基于VB的学生成绩档案管理系统的设计与实现

系统运用了Visual Basic程序设计技术与Access数据库管理技术完成的。系统可以有效提高学校管理成绩档案的效率与准确性,是学校办公自动化的重要组成部分。VB具有可视化集成开发环境,以事件驱动、图形用户界面等为特点,在设计学生成绩管理系统方面有着独特的优越性。选用Access完成数据库后台信息管理,具有检索迅速、存储量大、数据处理快捷、保密性好、寿命长、便于打印等特点,实现了对学生成绩管理的科学化、自动化、规范化。     

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).