低功耗温室无线测量节点的设计

为了提高温室环境参数的监测效果,采用射频SoC芯片nRF9E5、数字温湿度传感器SHT11及光强度传感器TSL2560D,设计了无线温湿度及光照度监控系统的测量节点;并根据无线通信系统的特点设计了系统的软硬件结构,其低功耗无线传输模式降低了节点的能耗.经调试和试验运行,系统具有可靠性高、使用方便、通信节点容量易扩展等优点,这对较大空间的温湿度及光照度的监控具有良好的应用价值.     

基于 ZigBee 的无线温湿度传感器网络设计与实现

在生产和科学研究过程中的很多场合对环境的温湿度有较高的要求.为了更方便快捷的监控环境温湿度,文中针对有线温湿度监测系统布线复杂、成本偏高以及后期维护不便的问题,结合无线传感器网络技术,设计和实现了一种基于 ZigBee 技术的温湿度监测系统.本方案采用星状网络结构,采用集成了51内核的无线射频芯片 CC2430以及高集成度的数字温湿度传感器 SHT11构建节点硬件,并实现了节点软件.测试结果表明,本系统具有低功耗、低成本、易于维护扩展等优点.     

基于ZigBee的无线温湿度传感器网络设计与实现

在生产和科学研究过程中的很多场合对环境的温湿度有较高的要求。为了更方便快捷的监控环境温湿度,文中针对有线温湿度监测系统布线复杂、成本偏高以及后期维护不便的问题,结合无线传感器网络技术,设计和实现了一种基于ZigBee技术的温湿度监测系统。本方案采用星状网络结构,采用集成了51内核的无线射频芯片CC2430以及高集成度的数字温湿度传感器SHT11构建节点硬件,并实现了节点软件。测试结果表明,本系统具有低功耗、低成本、易于维护扩展等优点。     

基于无线传感器网络的温室环境监控系统研究

为在完成温室内环境参数的自动采集和调控,设计了基于无线传感器网络的温室环境监控方案.介绍了温室监控系统整体结构,分析了基于CC2431无线传感器网络节点的硬件设计,并在此基础上进行了TinyOS操作系统的移植和节点的软件设计.由于该无线传感器网络节点具有功耗低、体积小、工作可靠、易于扩展等优点,基于该无线传感器网络的温室环境监控方案有很好的应用前景.     

基于WSNs的农业温室监控系统的设计

设计基于CC2430的无线传感器网络农业温室监控系统,系统实现对农业温室空气温湿度、土壤 温湿度以及光照度等参数采集;同时控制风机、暖气、水泵、遮光帘等温室环境调节设备,使温室达到农作 物生长的最佳环境;给出了系统的总体架构,设计和开发了网关、路由节点和终端节点的软件与硬件,并设 计了上位机的智能农业温室环境生产...     

用于环境监测的ZigBee无线传感器节点设计

温室环境监测采用基于ZigBee技术的智能网络化传感器有着很明显的优势。ZigBee网络容量大、功耗低、易于扩充并且支持自组织组网。该文设计了一种ZigBee无线传感器监测节点,介绍了基于ZigBee协议构建的无线数据采集网络,包括传感器节点的软、硬件设计。实验证明：节点工作状况良好,整个网络具有较高的可行性,可以实现对环境温湿度、光强等信息进行实时、准确的监测。     

基于ZigBee协议的智能农业管理系统

为了解决温室环境监测系统中遇到拓扑结构固定节点延展性差等问题,提出了基于ZigBee无线传感器网络的温室监测系统设计与实现方法,构建了基于ZigBee协议的无线监测网络,给出了网络中节点硬件和软件的设计方案,详细论述了ZigBee协调器的组网过程。测试结果表明,该系统具有结构简单、节点灵活功耗低等优点,实现了在无线环境下对温室中温湿度的有效监测。     

基于无线传感器网络技术的温室环境监测系统研究

温室环境监测采用基于Zigbee技术的无线传感器网络有着明显的优势。Zigbee网络容量大、功耗低、易于扩充并且支持自组织组网。本文设计了一种基于zigbee的温室环境监测系统,简述了zigbee的特点及温室环境监测系统的特点,包括网络协调器节点和传感器节点的硬件和软件设计。该设计可构架一个较大范围的无线传感器网络,对温室环境进行实时监控。     

农产品储运监控系统设计与实现

针对冷链运输环节中农产品环境监测困难这一问题,基于无线传感器网络技术、4G技术和嵌入式技术,设计了农产品储运监控系统。采用温湿度传感器模块、气体浓度传感器模块,实现了车厢内温湿度、气体浓度的采集;以CC2430为核心搭建了无线传感器网络,实现了数据的无线传输。基于S5PC110微处理器和嵌入式Linux操作系统,构建了嵌入式网关。通过嵌入式数据库管理模块,完成了无线网络传感器节点的数据实时显示和存储,以及对设备工作状态进行控制。同时,利用嵌入式网关的4G模块,完成了数据的远程收发和设备工作状态的远程控制。测试表明,该系统具有功耗低、组网灵活、可扩展性强的优点,可以实现对农产品储运车厢内各种环境信息的实时监测,能够较好地满足农产品冷链运输的应用需求。     

基于CC2530的温湿度监测系统的设计与实现

针对能够实时了解、监控环境现场温湿度状况的实际需要,设计了基于TI射频收发器CC2530芯片及温湿度传感器SHT10组成的无线传感器节点,利用ZigBee技术组建无线温湿度传感远程监测系统。测试结果表明：系统不仅实现了实时环境现场监测,而且Web服务满足了远程监控的实际需要。系统具有性能稳定,易于布设、维护、扩展等优点。     

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.