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行为识别是普适计算的一个重要研究内容,通过识别用户行为,可以为用户提供智能辅助和个性化服务。随着微型低功耗传感器的发展,基于传感器技术的行为识别已经成为一个研究热点。采用UWB(Ultra-
Wideband,超宽带)传感器获取用户数据,提出一种针对用户行为识别的特征提取方法,采用朴素贝叶斯分类算法实现对行为的分类,并通过实验验证了该方法的有效性。 相似文献
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为了提高普适计算系统的开发效率, 设计了一个基于OSGi框架的动态普适计算中间件模型. 该中间件模型以OSGi框架为基础, 建立移动管理器管理用户和服务的移动, 利用上下文管理器来管理上下文, 动态调整自己的行为, 支持上下文感知应用. 通过标准的接口实现各种异构普适设备间的互操作性. 实验结果表明该中间件能够满足通用普适计算环境的要求, 对于普适计算系统的开发具有一定的借鉴意义. 相似文献
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一种基于情境的语义Web服务发现方法 总被引:1,自引:0,他引:1
在普适计算环境下,如何结合情境信息以发现满足用户需求的服务,是目前Web服务研究的一个关键问题.提出一种基于情境的Web服务发现框架,采用本体进行情境建模,利用用户反馈信息进行权重计算,并给出了一个基于相似度的语义Web服务的匹配算法.最后通过实验验证了该方法的有效性. 相似文献
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普适跟踪结合增强现实和普适计算的多传感器系统成为一个大规模复合跟踪网络,对各种异质源数据进行融合,有效综合利用多种跟踪技术,完成真实世界和虚拟世界的无缝结合和实时交互,是一个新的交叉研究领域.为克服增强现实跟踪平台的可重复利用性差的缺陷,研究普适跟踪中一个关键问题:一个开放式的可重用的系统框架的开发,由跟踪系统硬件抽象归纳出一个可重复利用的基于组件的数据流处理模型,模型对任意几何关系及任意时刻的测量都可以进行融合从而达到最优状态.系统框架,传感器的改变或增减不会对融合结果产生太大影响,复合跟踪系统的动态集成性提高. 相似文献
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射频识别技术和无线传感器网络(WSN)技术是普适计算中两个最为重要的组成部分,它们各自具有不同的优点和应用领域。射频识别传感器网络,将射频识别融入WSN中,利用无线传感器网络覆盖范围广等特点,能够实现远距离的信息识别和网络整体信息的综合管理。本文探讨射频识别技术与WSN技术相融合,对其融合方案进行了比较,并分析了射频识别与WSN相互融合的状况和发展趋势。 相似文献
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基于移动增强现实的智慧城市导览 总被引:1,自引:0,他引:1
提出一种采用移动增强现实技术实现智慧城市导览的方法,满足用户个性化、多尺度、按需推送的智能导览需求,呈现用户虚实融合的周边环境.移动终端计算性能以及资源存储能力有限,但集成多种传感器,方便携带,易于显示.利用服务器实现基于词汇树的海量场景识别定位系统.依据地理位置信息动态划分分区缩减了场景检索范围,基于二进制鲁棒尺度不变特征(binary robust invariant scalable keypoints,BRISK)进行层级式聚类提高了识别算法的实时性.移动终端利用服务器返回的识别结果进行BRISK特征与光流算法结合的混合特征跟踪注册方法,并通过点集映射消除特征点漂移,利用前后帧信息以及关键帧信息减少跟踪抖动.UKbench标准图像库以及真实环境下的实验结果表明,虚实融合的智能导览效果良好.该原型系统已成功应用于上海电信体验馆等展馆智能导览系统. 相似文献
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针对手机个人信息安全的保护,设计了一种基于传感器信息分析的用户认证方案。利用内置加速度传感器和触摸屏传感器采集用户数据,对电话接听、触屏滑动操作、待机状态等行为进行特征分析,运用动态时间规整算法分别进行分类识别。考虑单一特征局限于特定状态导致识别结果的稳定性较差,进一步引入多元线性回归方法构建融合判定模型,有效提高了个体区分度。该方案不需要特定的硬件设备配置,满足实际场景中用户使用舒适性要求,实验仿真结果验证了方案的有效性,能够准确辨别用户本人对手机的控制状况。 相似文献
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张涛 《计算机测量与控制》2015,23(1):86-89
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. 相似文献
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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. 相似文献
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《Information & Management》2016,53(6):787-802
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. 相似文献
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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. 相似文献
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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. 相似文献
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《浙江大学学报:C卷英文版》2014,(11)
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 相似文献
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Zhao-hui WU 《浙江大学学报:C卷英文版》2014,(10)
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 相似文献
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《浙江大学学报:C卷英文版》2014,(10)
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 相似文献
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《浙江大学学报:C卷英文版》2014,(8)
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 相似文献