Adaboost集成BP神经网络在传感器阵列检测系统中的应用

针对目前常见的多元有害气体检测问题,设计并搭建了一种基于传感器阵列和集成 BP神经网络相结合的传感器阵列检测系统。在该系统中采用集成BP神经网络对传感器阵列的三种混合有害气体的响应信号进行回归分析。为了提高集成BP神经网络的预测准确性,又利用Adaboost算法对集成BP神经网络进行了优化。结果显示：该系统能够准确地检测气体组分,通过Adaboost算法对集成BP神经网络优化后,预测的平均相对误差小于2%,能够有效解决气体传感器的交叉敏感问题,提高传感器的选择性。     

飞控系统传感器故障诊断的神经网络方法研究

BP神经网络对于飞行控制系统传感器故障诊断是一种有效的故障模式识别方法;在标准BP神经网络的基础上,提出了一种新的BP改进算法——自适应FMBP算法(SAFMBP),用以消除标准BP网络收敛速度慢及易陷入局部极小等缺点,并且建立了飞行控制系统仿真模型和传感器常见故障模型,采用基于神经网络模式分类的故障诊断方法,应用改进的BP神经网络(SAFMBP)进行飞控系统传感器的故障诊断,最后给出了仿真诊断实例。     

基于神经网络的传感器非线性误差校正

介绍了用神经网络校正传感器系统非线性误差的原理和方法,提出了一种基于RBF神经网络的传感器非线性校正模型及其算法,并与采用BP神经网络校正非线性误差进行了比较,并给出一个仿真实验,实验结果表明:采用RBF神经网络的传感器非线性校正精度和网络训练速度均大大优于BP神经网络,能满足实用要求.     

基于BP神经网络的多传感器信息融合研究

BP网络是应用最广的一种人工神经网络,将BP神经网络应用到压力检测领域的温度等非线性补偿,具有重要的实用价值,对压力检测精度的改进效果显著;从传感器信息融合的角度看,神经网络就是一个融合系统;通过对神经网络基本理论的阐述,针对研究对象将BP神经网络原理与多传感器信息融合技术有机集合起来,提出了基于BP神经网络的二传感器信息融合模型及改进算法,建立了BP神经网络训练标准样本库,并对该网络模型进行主要技术指标的测试和仿真工作,测试结果表明构建的模型及其改进算法能很好地满足了高精度压力检测仪的指标要求.     

PSO-BP网络模型在温室数据融合中的应用研究

由于温室的众多要素之间是相互制约、互相配合的,为了形成一个准确、合理的判断,将PSO算法的全局优化能力和BP神经网络良好的非线性映射能力相结合,优化BP神经网络的权值和阈值,提出了一种基于PSO的BP网络数据融合算法,并利用该算法对温室多传感器(温度传感器、湿度传感器和光照度传感器)同时检测到的数据进行融合。仿真结果表明:基于PSO-BP网络的数据融合算法能够获得温室准确有效的信息,提高温室控制的有效性与准确性。     

基于神经网络的多传感器融合技术研究

研究了基于神经网络的多传感器融合技术,并将其应用于自主吸尘机器人中.给出了神经网络传感器融合技术的基本原理,探索了改进的BP信息融合算法,使得改进后的算法在收敛速度上得到了很大的改善;介绍了传感器的监测系统和传感器特征的选择,构建了BP算法模型,并进行了仿真,得到了良好的实验结果.     

改进神经网络的传感器故障诊断与容错处理

为提高神经网络对霍尔传感器发生故障诊断率,设计了一种改进神经网络模型,该模型由反向传播(BP)神经网络并行组成,利用算法对各BP神经网络输出进行加权整合,进而得到误差更小的输出结果,并将改进神经网络模型应用于无刷直流电机霍尔传感器故障诊断系统中,利用无位置传感器系统实现霍尔传感器故障容错处理。仿真结果表明:改进神经网络故障诊断准确率达到96%,高于传统BP神经网络,且容错控制系统能够显著降低霍尔传感器故障对电机转速的影响,使电机能够在霍尔传感器故障时正常稳定运行。     

基于BP网络的高精度信号调理系统的研制

为提高压力传感器输出信号的调理精度,研制了基于BP神经网络的高精度智能信号调理系统.设计了基于MAXl452的信号调理电路、通信接口电路,完成硬件平台的搭建.选择BP神经网络算法作为传感器补偿算法,并编程实现.通过测试系统,验证了采用神经网络算法的可行性.     

基于PSO-BP的无线传感器网络数据融合算法研究

为提高无线传感器网络(WSN)数据融合效率,减少网络的通信量以及降低传感网的能量消耗,提出一种基于粒子群优化BP神经网络的无线传感器网络数据融合算法;该算法将粒子群算法优化BP神经网络的权值和阈值后,与传感器网络分簇路由协议有机结合,将无线传感器网络中簇头和节点等同于BP神经网络里的神经元,利用优化后的BP神经网络有效地提取WSN数据融合原始数据之中的少量特征数据,之后把提取的特征数据发送到汇聚节点,进而提升数据融合效率,延长网络生存周期;仿真实验证明,与LEACH算法、BP神经网络和GABP算法相比,该算法可有效减少网络通信量,降低节点总能耗的15%,延长网络生存时间。     

基于MPSO-BP算法的四电极电化学气体传感器温度补偿研究

针对四电极电化学气体传感器的测量精度极易受环境温度影响的问题,提出一种基于粒子群优化-BP神经网络算法（PSO-BP）的温度补偿方法。利用改进的PSO算法（MPSO）对BP神经网络的权值和阈值进行优化,构造四电极电化学气体传感器的温度补偿模型,并设计了气体传感器测试系统。实验结果表明,MPSO-BP算法可有效提高BP神经网络的收敛速度和泛化能力;基于MPSO-BP算法的四电极气体传感器温度补偿模型,可将其温度补偿误差控制在0.1%以内。     

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.     

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.     

A pragmatic multi-method investigation of discrepant technological events: Coping,attributions, and ‘accidental’ learning

Discrepant technological events or situations that entail a problem, a misunderstanding or a difficulty with the Information Technology (IT) being employed, are common in the workplace, and can lead to frustration and avoidance behaviors. Little is known, however, about how individuals cope with these events. This paper examines these events by using a multi-method pragmatic approach informed by coping theory. The results of two studies – a critical incident study and an experiment – serve to build and test, respectively, a theoretical model that posits that individuals use a variety of strategies when dealing with these events: they experience negative emotions, make external attributions, and adopt engagement coping strategies directed at solving the event, eventually switching to a disengagement coping strategy when they feel they have no control over the situation. Furthermore, users’ efforts may result in ‘accidental’ learning as they try to overcome the discrepant IT events through engagement coping. The paper ends with a discussion of the results in light of existing literature, future opportunities for research, and implications for practice.     

The Distributed Time-Triggered Simulation Scheme: Core Principles and Supporting Execution Engine

Distributed real-time simulation is a young technology field but its practice is under increasing demands. In recent years the author and his collaborators have been establishing a new approach called the distributed time-triggered simulation (DTS) scheme which is conceptually simple and easy to use but widely applicable. The concept was initiated in the course of developing a new-generation object-oriented real-time programming scheme called the time-triggered message-triggered object (TMO) programming scheme. Some fundamental issues inherent in distributed real-time simulation that were learned during recent experimental studies are discussed along with some approaches for resolving the issues. An execution engine developed to support both the TMOs engaged in control computation and the TMOs engaged in DTS is also discussed along with its possible extensions that will enable significantly larger-scale DTSs.     

Software-Konfigurationsmanagement in großen Softwareprojekten

Zusammenfassung Mit zunehmender Größe der Softwaresysteme verschärfen sich die für die Software-Herstellung typischen Probleme: Beherrschen großer Objektmengen, Erhalten der Systemkonsistenz, Kontrolle der ständigen Änderungseinflüsse und Gewährleisten einer langen Lebensdauer. Die Disziplin Konfigurationsmanagement bildet den methodischen Ansatz, diese Probleme besser zu beherrschen. Software-Konfigurationsmanagement faßt die Herstellung von Softwaresystemen als eine Abfolge von kontrollierten Änderungen an gesicherten Zwischen- und Endergebnissen auf. Dargestellt werden die Objekte und Funktionen des Software-Konfigurationsmanagements sowie die hierfür in großen Software-Projekten benötigten Methoden, Instanzen und Hilfsmittel.     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and     

Editorial:Brain-machine interface(BMI) and cyborg intelligence

正Brain-machine interfaces(BMIs)aim at building a direct communication pathway between the brain and an external device,and represent an area of research where significant progress has been made during the past decade.Based on BMIs,mind information can be read out by neural signals to control     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate     

SCIENCE CHINA Information Sciences SUBJECT INDEX TO VOLUME 57(2014)

正~~     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate