基于无源超高频RFID温度标签的温度监测系统

设计一种基于无源超高频(UHF)射频识别(RFID)温度标签的温度监测系统.系统由课题组自主研发的无源超高频RFID温度标签、Speedway R220商用阅读器和上位机应用软件组成,实现了物品身份识别、温度实时测量和显示的功能.为提高温度标签的测温精度,提出了一种自适应功率匹配算法,使得天线扫描范围内的多个标签都能在最佳测温功率下测温.测试结果表明:当温度标签与阅读器天线的距离分别为0.5,1.0,1.5m时,测温误差小于±1℃.     

一种有源血氧传感标签设计

为实现日常动态下人体血氧饱和度的实时监测,设计了一种有源血氧传感标签,采用反射式血氧传感探头,介绍了反射式无创血氧饱和度测量原理、血氧检测的方法,设计了相应电路。采用nRF24LE1无线收发芯片为核心,构建有源射频识别(RFID)标签发射系统,将血氧检测与RFID技术相结合,实现了血氧检测的无线传输,设计实现了血氧监测设备的小型化,提高了其可穿戴性,适合在日常动态环境下的实时监测。     

基于Contiki和有源RFID的设备管理系统的实现

系统基于Contiki实现了一种有源RFID阅读器节点,同时实现了一种边缘路由器,通过边缘路由器与阅读器节点可以组成无线传感器网络。用户通过网络控制阅读器节点收集和管理RFID标签,实现对设备的管理。本系统保持了无线传感器网络部署范围广的优点,通过融合有源RFID技术减小了网络的复杂性并降低了系统功耗。该系统工作稳定,适用于在较大范围内对设备进行管理。     

融合RFID 的无线传感器网络节能研究

针对节省传感节点能耗和均衡整个网络中各节点能耗的问题,该文提出一种融合射频识别设计与优化路由协议的无线传感器网络节能方法。该方法首先采用RFID标签和阅读器分别与无线传感器网络节点以及无线设备融合,然后对该融合策略进行分析与设计,最后结合了LEACH算法的思想。实验仿真表明,新方法在延长整个网络生命周期和降低整个网络中的能耗方面明显优于LEACH算法。     

基于MEMS的可穿戴无线体域网设计与实现

针对高精度低成本可穿戴式人体动作捕捉,采用MEMS微惯性传感单元(IMU)设计实现无线体域网系统.系统由六轴微惯性单元MPU-6050、三轴地磁仪AK8975、微处理器及射频模块CC2530构成.首先,详细讨论系统硬件构架和基于Z-Stack的软件构架,然后通过上位机Matlab用户程序进行数据采集与实验验证.实验结果表明,与其他微惯性传感器系统相比,本设计采用高集成度的芯片和无线通信方式,在减小硬件体积的同时能够获得较高精度的数据(角度传感器零漂＜1.5°),对实现可穿戴无线惯性测量有着积极的作用.     

基于Linux socket的煤矿无线监控系统设计与实现

为改变当前国内落后的煤矿安全监控技术现状,解决煤矿安全监控中遇到的困难,提出利用无线传感器网络在煤矿安全监控中的优势,并结合Linux socket便捷、安全、高效的特点设计煤矿无线监控系统;选用ZIGBEE传输系统作为硬件平台,完成面向煤矿安全监控的多功能便携式无线传感器节点设计和基站传感器节点设计;上位机采用Linux操作系统的Socket技术,把数据送人主控站点计算机,并生成图表完成系统数据统计和监控;彻底解决了传统RFID监控技术通信距离受限瓶颈、数据离散不直观、无法为分析员提 供分析依据等一系列技术难题,具有一定的创新性和实用性,对研究煤矿安全生产数据收集新方案具有重要意义.     

基于ZigBee无线传感网络的人体动作信息采集平台设计

采集人体动作信息,提出了一种基于ZigBee无线传感技术的采集系统,以CC2530芯片为核心设计网络的协调器和终端节点,以MMA7361L三轴加速度传感器为采集传感器,搭建ZigBee无线采集网络,并在Visual Studio开发环境下设计上位机监控界面。介绍了ZigBee协议工作原理和节点的软硬件设计方法,并给出了上位机的软件设计。实验给出了无线传感网络节点的部分采集结果,并在上位机软件中显示加速度变化的曲线图。     

基于LabVIEW无线数据控制与传输系统的设计

将无线传输技术与虚拟仪器技术相结合,设计了一种数据控制与传输系统.该系统具有控制指令发送、数据发送和数据接收3种工作方式,控制指令和传输数据两种信息类型.通过系统结构设计、电路设计、通信协议设计、软件设计、LabVIEW系统界面和USB驱动程序设计等,该系统可以向微处理器发送控制指令信息,设置上位机和下位机工作模式和工作参数,实现传输数据信息发送和接收的半双工通信功能.整体设计表明,为无线数据的控制与传输提供一种设计方法.     

超低功耗有源RFID温湿度传感标签的设计与测试

为了显著降低有源RFID温湿度传感标签的功耗,设计了超低功耗有源RFID温湿度传感器标签.标签采用微控制器MSP430单片机为核心,以温湿度传感器SHT11和射频收发芯片nRF24L01为外围器件,完成温湿度的检测和发送.详述了温湿度传感标签的软硬件低功耗设计方法,以及功耗的测试与估算.该标签具有功耗小、成本低、运行可靠等特点,可广泛应用于光照、热和气流等环境能量供电的场合.     

无线射频识别及其在制造业中的应用

介绍了无线射频识别（RFID）的电子标签和阅读器.着重分析了RFID的工作原理和技术实现,包括：RFID的射频传输、反向散射调制（back scatter modulation）,标签先发言（TTF）和阅读器先发言（RTF）、数据交换和多标签同时识别.阐述了RFID的应用系统,它包括RFID系统、计算机处理系统、应用软件和系统软件.还阐述了RFID在制造业中的具体应用,包括：生产自动化,仪器、工具、器材和仓储的管理,门禁保安和产品防伪等.     

Only connect: teaching, technology and telesis

Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.     

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。     

Avoiding semantic and temporal gaps in developing software intensive systems

Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.     

Designing economic np control charts: A programmed simulation approach

This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.     

The development of robot art

Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008     

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.