基于体域网的远程健康监护系统设计

为满足对老年人和慢性病患者生命特征信息远程实时监测的需求,设计了基于体域网的远程健康监护系统,系统由WBAN、数据处理服务中心、各监控终端等几个部分组成。设计了基于ZigBee网络的生命特征信息感知节点,根据生命特征传感器采集的信号特点设计驱动电路,以CC2530为主处理器进行节点软件设计,完成了对人体心电、血压、温度等信息的实时采集和转发。数据处理中心负责信息存储、分析和发布,各种监控终端也可以通过数据处理中心查询被监测者的生命特征信息。测试结果表明,系统能够完成相应的功能,满足应用需求。     

基于GPS/GPRS滑坡位移监测系统的研制及应用

根据对地质滑坡监测的实际需求,设计了一种基于GPRS和GPS差分定位理论的滑坡位移监测系统;系统监测终端采用单片机作为处理器,通过GPRS网络建立无线通讯链路,把监测终端SuperStar-II GPS实时地采集GPS原码信息传到Internet网上的服务器,服务器完成GPS载波相位差分定位解算,并进行数据处理与分析后实现了滑坡位移渐变情况的实时监测;该系统三峡库区云阳故陵滑坡体现场应用以后,实际运行结果表明,系统性能可靠,实现了远程实时监测滑坡的位移状态,精度达到±5mm。     

基于GPS/GPRS的客车远程监控系统设计与实现

设计一种基于GPS/GPRS的客车远程监控系统,能够远程监控客车实载人数、速度、位置等信息,有效地提高了客车、特别是校车的行驶安全;系统由车载终端和上位机监控两部分组成;车载终端运用STM32F103单片机采集处理GPS经纬度、车载人数、速度、紧急报警等信息,并由GPRS芯片SIM908根据TCP/UDP协议发送到指定的Internet网络服务器;上位机监控软件由VS2008和QT4联合开发而成,并加载SQL数据库,能够实现读取Internet服务器信息并显示和保存,同时根据读取的GPS经纬度信息调用google地图,直观地显示客车位置,用户还可以调用数据库查看数据历史记录;经过多次实验,系统运行稳定,定位准确,测量人数准确度达到99%。     

嵌入式远程医疗会诊系统的设计

研究设计了远程医疗会诊系统模型,该模型包括嵌人式现场诊断系统、数据信息中心以及医院监控终端3个子系统:着重介绍了嵌人式现场诊断系统的软硬件实现,分析了其组成模块ARM系统、GPRS模块、GPS模块以及人体健康信息检测模块协调工作下完成体温、心率和血压三项技术指标采集,及患者地址定位以实现生命体征实时监控和远程辅助诊疗的过程;测试表明,无论是本地或者医院监控终端均可准确采集患者体征指标,为患者远程诊疗提供依据,对障碍患者的相应监控也可实现.     

农机车载系统的远程实时监控终端设计

以嵌入式处理器STM32F103为核心,利用GPS定位技术、CAN通信技术、GPRS通信技术设计了一种专门针对农机领域的车载监控终端.该终端能够实现车辆位置信息、行车状态信息的实时采集与远程无线传输;同时,能够处理远程监控中心下达的指令,对车辆进行限速、锁车、设置电子围栏.目前,该终端已经在洛阳某农机公司的农机车辆上进行了应用,运行稳定可靠,为车辆快速故障定位、维修、管理提供了真实数据支撑.     

车载远程无线监控系统设计与实现

在Delphi环境下结合GPS、GPRS、GIS技术,开发了车栽终端与监控端之间的程序.实现了车栽终端与远程监控端之间的无线通信,在监控端实时显示当前被监控车辆的位置信息等及远程控制车栽终端.经过试验测试和实际运行.该系统能够准确、快速地完成指定功能.     

保鲜车状态远程监控系统设计

保鲜车状态远程监控系统由车载监测终端和远程监控终端两部分组成。车载监测终端实时测量车厢内的温湿度和保鲜车的位置,通过GPRS模块将测量信息发送到MQTT服务器;远程监控终端采用嵌入式Linux系统,通过网卡模块从MQTT服务器获取测量信息,并通过网卡使用HTTP协议调用腾讯地图接口,解码地图数据,将车辆在地图上的实时位置和温湿度数据呈现在远程监控端,便于监控,并可通过触摸屏更改显示地图的范围大小以及温湿度阈值等,进行超限报警及相应控制。该系统为远程数据监控提供了一种便携、可靠、显示直观、易于实现的解决方案。     

电动汽车远程监控系统

设计并实现基于GPRS无线网络的电动汽车远程监控系统,该系统将电动汽车车载监控终端获取的GPS数据及从车辆CAN总线获取的电池、电机等数据整合后,通过GPRS无线网络发送到监控中心,监控中心按自定义的数据传输协议进行解析,并通过后期分析处理实现对车辆运行状态的远程实时监控。     

车载自动售货机系统的设计与研究

随着售货机管理经营技术手段的不断完善,开发出基于车载移动无线自动售货机是当前人们现实需求以及技术发展的需要.该系统结合GPRS、GPS、GIS等技术,设计并开发了安全有效的传输协议.实现了车载终端与远程监控中心的无线通信.在监控端实时显示当前各个售货机终端的交易信息、位置以及远程控制车载终端.经过实验测试,该系统能够准确、快速的完成指定功能.     

GPRS远程数据监控服务器的实现

GPRS是General Packet Radio Service的英文简称，是一种基于GSM系统的无线分组交换技术。本文讨论了利用GPRS技术进行远程数据监控的特点，在监控服务器中引入了一种新型高效的按需转发方法。实现了转发服务器对数据采集终端实和监控终端的实时控制，本服务器的实现可大大提高远程数据监控系统转发的效率和安全性。     

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。     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

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.     

View-based model-driven architecture for enhancing maintainability of data access services

In modern service-oriented architectures, database access is done by a special type of services, the so-called data access services (DAS). Though, particularly in data-intensive applications, using and developing DAS are very common today, the link between the DAS and their implementation, e.g. a layer of data access objects (DAOs) encapsulating the database queries, still is not sufficiently elaborated, yet. As a result, as the number of DAS grows, finding the desired DAS for reuse and/or associated documentation can become an impossible task. In this paper we focus on bridging this gap between the DAS and their implementation by presenting a view-based, model-driven data access architecture (VMDA) managing models of the DAS, DAOs and database queries in a queryable manner. Our models support tailored views of different stakeholders and are scalable with all types of DAS implementations. In this paper we show that our view-based and model driven architecture approach can enhance software development productivity and maintainability by improving DAS documentation. Moreover, our VMDA opens a wide range of applications such as evaluating DAS usage for DAS performance optimization. Furthermore, we provide tool support and illustrate the applicability of our VMDA in a large-scale case study. Finally, we quantitatively prove that our approach performs with acceptable response times.