基于双混沌系统的大数据环境并行加密算法设计 

为了克服大数据在采用串行加密方式时具有的加密效率低的问题,设计了一种基于双混沌系统的大数据环境的并行加密算法;首先,设计了基于 Map-Reduce的大数据环境的并行加密模型;然后,引入了改进的Logistic映射和Tent映射构成双混沌系统,并设计了Map函数、Sort函数和Reduce函数实现并行加密,在Map函数中通过Logistic映射和Tent映射的不断迭代计算加密密钥或解密密钥,在Sort 函数对由Map函数输出的键值对进行排序并剔除重复的数据块,在Reduce函数中对加密后的密文数据块或解密后的明文数据块进一步合并构成输出数据;仿真实验表明:文中设计的基于双混沌系统的Map-Reduce并行加密模型能高效地进行数据加密或解密,能提高数据安全性和加密效率,具有较强的可行性。     

基于改进量子粒子群的分布式并行计算框架设计

为了实现用户任务在大规模计算机集群上进行高效地处理,并克服现有并行计算框架通用性不强的缺点,提出了一种基于改进量子群算法和Map-Reduce模型的通用并行计算框架;首先,对经典的Map-Reduce分布式并行计算框架以及并行计算流程进行了具体描述;然后,基于改进的量子粒子群算法设计了改进的Map-Reduce模型,在Map阶段通过多种群并行搜索并计算所有粒子适应度,在Shuffle和Sort阶段实现粒子的排序和种群的重新划分,然后在Reduce阶段更新控制系数和粒子位置,当最优解不变时,通过混沌扰动对其进行扰动;仿真实验表明同,文中设计的基于改进量子粒子群算法和Map-Reduce模型能高效地执行任务,较传统的MapReduce模型具有较少的执行时间,具有很强的可行性,是一种有效的通用并行计算模型。     

基于Stein-Weiss函数的彩色掌纹特征识别算法

针对目前掌纹识别算法中对彩色掌纹图像的识别研究不多,提出一种新的基于Stein-Weiss函数解析性质的BP神经网络彩色掌纹图像的识别算法。首先为彩色掌纹图像中的每个像素点构建一个Stein-Weiss函数,再根据Stein-Weiss函数的解析性,计算出相应像素的十六个特征值,将这些特征值输入到BP神经网络的输入层,通过BP神经网络的自学习能力对这些数据进行分类学习;然后通过BP神经网络的泛化能力来获取掌纹边缘线;最后对掌纹边缘线提取成对几何特征建立特征库,通过成对几何直方图相交算法进行掌纹识别。实验结果表明,相对于以往的灰度掌纹图像识别算法,该算法能够更快地提取出更精细的掌纹线,识别率更高,并且对于旋转和噪声的干扰具有较强的鲁棒性。     

BP数字识别自动监控系统

设计并实现了磁控溅射仪自动监控系统,对实验过程进行自动监控并记录实验数据,由服务器主控程序监控实验,存储并识别数字数据,识别过程是调用Matlab语言编写的识别系统生成的动态链接库,用BP神经网络训练神经元来进行识别,可以由客户端主控程序调用并查看实验数据曲线,实现实时的远程监控,解决了磁控溅射仪没有数据输出接口不方便记录实验数据的困难及实验过程中高辐射对人体危害的问题.整个系统识别效率高,速度快,准确性高,自动监控实验过程,具有很高的实用价值和应用前景.     

一种BPNNs识别算法的医学检测泛实时性问题研究

尿沉渣空间环境的复杂性,导致采集的有形成分图像存在较多冗余信息,提取有效的图像信息变得较为困难,进而使得识别系统需要处理的数据量十分巨大。虽然BP神经网络算法的串行版本DJ8000系统平台解决了细胞等有形成分的识别准确率问题,但其不能满足尿沉渣图像医学检验的实时性要求。为此,提出了基于BP神经网络算法优化的并行处理GPU框架的系统平台。它采用并行优化框架,同步高效地对数据进行加速处理;同时,以GPU 计算和测试平台为硬件系统支持,无论是在硬件指标、数据传输及总线技术还是软硬件的兼容性方面,都有助于解决算法中时常出现的负载不均衡的问题。实验数据表明,BP神经网络尿沉渣识别算法在优化并行框架的GPU 系统处理平台上显示的加速比、时效比和运行时间等相关性能参数值都有所提升。相比于DJ8000系统平台,优化的AMD HD7970 和 NVIDIAGTX680 两个并行处理GPU框架系统平台相应的加速比参数值分别是前者的10.82~21.35个和7.63~15.28个标准当量。实验数据充分说明,优化并行框架的GPU处理系统中相关的逻辑数据、地址数据和线性寻程的函数映射关系均能相互动态分配对接并优化算法架构,实现软件到硬件系统的最优比映射,最终解决由于线程间负载不均衡导致的性能瓶颈问题,从而有效地化解了医学领域实时检测中的时效性这一难题。     

基于改进BP神经网络的煤与瓦斯突出预测系统

针对传统BP神经网络收敛速度慢、易陷入局部极小等问题,采用Matlab神经网络工具箱中的自适应学习率VLBP算法和基于数值优化技术的LMBP算法对传统BP神经网络算法进行改进,并设计了基于改进BP神经网络的煤与瓦斯突出预测系统;分别采用传统BP神经网络模型和改进的BP神经网络模型进行煤与瓦斯突出预测实验,结果表明改进的BP神经网络能够更快、更准确地预测煤与瓦斯突出。     

结合深度神经网络的网络监控系统微表情识别

为了提高网络监控系统微表情识别的效果,结合深度神经网络技术提出新的智能监控系统微表情识别算法。将判别能力强的卷积神经网络特征与鲁棒的直方图特征结合,利用卷积神经网络提取目标的空间特征,再将卷积特征表示为直方图,结合直方图和卷积神经网络两者的优势设计新的人体追踪算法;设计跨模态监督的深度神经网络训练方法,将可见光视频数据送入深度神经网络进行训练,利用近红外光视频对训练程序进行监督。基于公开的多模态微表情识别数据集完成了验证实验,结果显示该算法有效地提高了微表情识别的性能。     

基于GA-BP神经网络的目标识别方法

针对单一特征识别算法泛化能力差、识别准确率低的问题,本文深入分析了典型目标地震波信号的时域特征,融合多个特征构建训练样本,采用BP神经网络算法对目标进行识别;针对BP神经网络收敛速度慢、泛化能力差的缺点,通过遗传算法对BP神经网络优化。最终形成基于GA-BP神经网络的目标识别方法,并进行实验验证。结果表明:基于GA-BP神经网络算法无论是在收敛性、准确性还是计算速度上都优于传统算法。     

基于遗传算法和BP网络的文字识别方法

将基于遗传的BP神经网络算法用于文字识别算法结合了遗传算法和BP网络的优点.先采用遗传学习算法进行全局寻优、再利用BP算法进行精确训练、优化BP(Back Propagation)神经网络权重学习和训练的神经网络文字识别算法.实验结果表明该算法完全达到了文字识别要求,识别率达到了98%.并且在识别速度上也明显优于传统的BP神经网络及其他改进算法,具有精确性、收敛性和识别速度快等特点.     

基于无线体域网的在线人体活动识别

基于智能手机传感器的人体活动识别是普适计算领域的研究热点.为扩展可识别的活动种类,并提高准确率和实时性,提出了由智能手环和智能手机组建无线体域网通过深度神经网络在线识别人体活动的方法.首先,设计由智能手环和智能手机组成的无线体域网的总体框架;然后,对预处理后的传感信号,构造带有Inception结构的卷积神经网络和长短时记忆递归神经网络来分别提取时空域特征,并结合两类网络结构来融合多模态传感数据,离线进行神经网络模型训练;最后,对训练好的神经网络模型进行优化,并部署到智能手机上,在线实时识别人体活动.实验结果表明,本文方法无需手工设计特征,可自动融合各类异构传感数据,更加准确、高效地识别了更多种类的活动.     

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)

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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