基于微加速度传感器的无线鼠标的设计

研究基于微加速度传感器的无线鼠标的设计,讨论了MEMS无线鼠标的软件、硬件设计和系统组成,给出了M atlab环境下系统的模型和算法。模拟结果说明:无线鼠标的设计是合理可行的,提出的二次积分近似算法是简捷有效的。     

振动信号在线检测的超低功耗无线传感器节点设计

本文介绍了实现在线振动检测和分析的无线传感器节点的超低功耗硬件设计。该传感器节点基于超低功耗单片机MSP430F135,由射频通信模块和加速度传感器及信号调理电路构成。我们主要研究了用集成加速度器件以低功耗方式实现振动信号在线检测的设计方法,以及使节点满足超低功耗和检测性能要求的系统各模块工作方式（包括模式和时序）和电能管理措施,使节点在满足在线实时检测和信号传送要求的基础上,其平均功耗达到采用电池供电的无线传感器节点的性能和寿命要求。     

基于微加速度计的低功耗无线惯性鼠标的设计

提出了一种基于微加速度计的无线惯性鼠标的设计方案。该方案以微加速度计ADXL213作为信号检测元件,并采用低功耗处理器MSP430F135和RF芯片nRF401进行信号处理与无线传输。按该方案设计的鼠标结构简单、密封性好,在降低鼠标功耗和提高鼠标使用灵活性等方面具有较大的应用前景。     

一种超低功耗无线震动传感器设计

为实现长期无人值守的震动测量与目标识别,设计了一种超低功耗无线震动传感器.该传感器采用磁电式敏感元件来获取震动信号,通过信号调理、数据采集、数据分析、数据存储和无线通信的软硬件设计,完成目标识别和数据传输.通过免供电传感和双处理器设计实现超低功耗工作,利用无线传感器网络监测模式构建无线、分布式震动监测网络.试验结果表明:该传感器能够完成震动信号测量并识别履带车和行人这两种典型目标,电流仅有30μA,预计可连续工作200天以上.     

一种笔形无线鼠标的设计

介绍一种利于书写、绘画的笔形无线鼠标的设计。该笔形无线鼠标不仅具有传统无线鼠标的所有功能,还在外形结构及定位方式上有了人性化的改进。首先将传统鼠标形状改为笔形设计更利于书写、绘画时使用,其次将光学定位改用加速度传感器定位设计,使其可以脱离桌面悬空使用。调查表明,笔形无线鼠标具有广泛的应用领域。     

无线鼠标电路设计及算法实现

文中设计的无线鼠标包含发射电路和接收电路两部分,发射电路先采用光传感器ADNS5030检测鼠标的移动信息,然后输出到内置单片机的无线模块CC2430的I/O口,通过CC2430控制并将此信息发射到接收电路,接收电路接收到移动信息后,根据鼠标位移状态机解码算法,得到移动信息及按键信息,通过HT82M98A处理后将信息传给计算机,计算机自动完成相应动作;然后不断的循环;经测试,该电路不仅具备普通有线鼠标的全部功能,还可远距离灵活操纵鼠标,在大礼堂等开阔场所可达80 m以上;计算机自动识别无线鼠标接收电路,不需要额外安装程序,每一次鼠标信号处理总时间不大于1 ms,无线鼠标移动灵活,无停滞现象.     

八梁硅微加速度传感器横向灵敏度的研究

一般的压阻式硅微加速度传感器结构多采用悬臂梁加质量块的形式,这种结构的传感器有很高的灵敏度,但它会产生很高的横向效应.文中介绍一种八梁结构的三轴加速度传感器,通过用ANSYS有限元分析软件仿真计算,说明该结构的加速度传感器具有很小的横向效应.     

基于簇结构的无线传感器网络移动目标 精确跟踪

对于移动目标跟踪,需要利用加速度或速度恒定的模型对其连续轨迹进行推断.在传感器网络环境下,利用无线传感器网络的冗余特点,提出了一种分簇结构和分时机制下采用流水线工作模式进行跟踪探测的方法,减少两次探测值之间的时间差,通过分析和仿真验证,该方法能够有效地降低对移动目标的跟踪误差.所设计的算法计算复杂度低,实现简单,满足无线传感器网络节点的计算能力要求.     

基于MEMS加速度传感器的无手鼠标

设计一种无手鼠标,使手部残疾或脊髓损伤的患者能够通过无手操作的方式使用计算机。系统以 MSP430F5529为控制芯片,控制放置在头部的 MEMS 加速度传感器测量头部倾角,并将倾角转换为光标位移量来控制光标的移动;利用声控模块和继电器模块设计声控开关,来实现鼠标按键的点击功能;利用 nRF2401无线模块实现鼠标系统与计算机的无线通信。该倾斜鼠标可以使用户通过倾斜头部来控制光标的移动,通过向吹气开关吹气实现鼠标按键的点击功能。该倾斜鼠标可以辅助手部残疾或脊髓损伤的患者通过无手操作的方式有效地控制光标移动,为其使用计算机提供了一种途径。     

基于MEMS技术的微电容式加速度传感器的设计

给出了一种基于MEMS技术制作的微电容式加速度传感器的结构及工艺。为了准确地把握这种微电容式加速度传感器的力学和电学特性,仔细地建立了它的力学模型。在此基础上,详细分析了它的动态特性———模态。并用有限元的方法分析和计算了微电容式加速度传感器的加速度与电容信号的非线性输入输出关系,并结合实测参数验证了模型的有效性。最后提出了一种详细的有效的基于MEMS技术的微电容式加速度传感器的结构以及加工工艺流程。基于MEMS技术制作的微电容式加速度传感器具有结构简单、工作可靠和工作范围大的特点。根据这套方法,可以比较方便地设计并加工不同测量要求的加速度计。     

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.     

Call for Papers The 6^th International Conference on Grid and Cooperative Computing

Recent years have seen rapid advances in various grid-related technologies, middleware, and applications. The GCC conference has become one of the largest scientific events worldwide in grid and cooperative computing. The 6th international conference on grid and cooperative computing (GCC2007) Sponsored by China Computer Federation (CCF),Institute of Computing Technology, Chinese Academy of Sciences (ICT) and Xinjiang University ,and in Cooperation with IEEE Computer Soceity ,is to be held from August 16 to 18, 2007 in Urumchi, Xinjiang, China.     

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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