基于LoRa的低功耗水产养殖水质监测系统设计

针对水产养殖无线水质监测系统通信距离短、功耗高、网络复杂的问题,提出了一种新型的水产养殖水质监测系统。将STM8L低功耗微控制器作为核心,结合LoRa调制技术自定义网络通信协议,设计了低功耗远距离的无线传感器网络节点,完成了对水产养殖水质参数的采集与传输。重点介绍了软硬件的低功耗设计,进行了系统能量消耗和通信距离的测试。实验结果表明:水质监测系统在覆盖范围和功耗上优势明显。LoRa通信技术给未来组建大规模、低功耗无线传感器网络提供了可能性,在智慧农业上有很好的推广价值。     

基于ZigBee技术的葡萄园无线监测节点的研究与设计

针对解决葡萄园环境参数的无线监测问题,论文提出了一套无线实时监测葡萄园生态环境的方案,设计了一种能够实时采集、传输葡萄园环境参数采集系统.该系统基于无线传感器网络技术,采用CC2530芯片为基础设计,传感器节点上接有空气温湿度传感器、土壤温湿度传感器以及二氧化碳浓度传感器,通过这些传感器采集葡萄园环境参数.传感器节点将采集的环境参数经无线方式传给采集节点,采集节点通过串口将数据传输到PC机的数据库中,实现了葡萄园环境参数的无线实时监测.测试证明,该系统具有功耗低、传输实时数据、可靠性高等优点,能够地满足葡萄园环境参数监测的应用要求.     

适用于多层住宅楼结构的无线智能水表抄表系统

针对通用无线传感器网络（WSN）平台无法满足无线智能水表抄表系统（SWWMRS）低成本、低功耗、高效和高可靠性等方面实际应用需求的问题,设计并实现了一种改进的无线智能水表抄表系统。该系统以适合多层住宅楼结构的抄表应用为目标,结合无线智能水表抄表系统特点、部署环境特征和抄表业务逻辑,提出了一种改进的全网络节点邻接链路发现算法来实现自动组网和集中式的路由管理,在抄表过程中,采用最小化全局转发次数的策略结合最小剩余能量节点避免策略来均衡节点能耗,同时,优化了媒体访问控制（MAC）层防碰撞机制和低功耗空闲监听方案。最后,选取了一栋常规结构的24层居民楼进行测试。实验结果表明：系统在通信距离、功耗、可靠性等方面均能满足实际应用需要,对比通用WSN平台CC2530,系统在通信距离、抄表成功率、效率和功耗方面具有一定的优势。     

基于甲烷监测的无线传感器网络的功率优化

针对目前甲烷监测系统可靠性不高,介绍了一种低成本、低功耗的装有甲烷传感器的无线传感器网络替代传统的有线监控系统,从而更经济更高效地监测煤矿中的甲烷突出;无线传感器网络通过井下终端节点监测甲烷浓度的变化,给地面监控中心提供早期预警信号,使煤矿安全人员能及时发出命令来快速疏散在井下高危险区域作业的矿工,减少损失;重点提出了通过使用低功耗器件、发送最优数量的采样数据以及自动切换传感器节点工作状态来实现甲烷监测系统的功率优化,试验分析发现终端节点功耗可降低至1/4~1/2,通信距离可增加3倍左右,将会有很好的市场效应。     

自适应半径调整的无线传感器网络覆盖算法

针对随机分布的无线传感器网络中节点分布不均匀造成的覆盖冗余,以及同时存在的覆盖空洞,提出了一种自适应半径调整无线传感器网络覆盖算法,通过阈值判断监测区域内传感器节点密度,根据监测区域内传感器节点疏密程度,利用节点半径步长系数对监测区域内节点半径进行自适应调整,建立无线传感器节点发射功率与节点发射半径的模型,计算无线传感器发射功率,通过实验和仿真,表明上述方法能够保证网络覆盖率的基础上减少无线传感器网络总功耗,提高网络寿命.     

环境监测物联网传感器节点设计与实现

针对无线传感器网络中的传感器节点通常使用电池供电且能量不易补充的特点,设计了一种低功耗的适用于环境物联网实时监控的节点。节点分为传感器节点和汇聚节点。传感器节点采用MSP430F1611作为微处理器,采用TI公司的低功耗射频芯片CC2420作为通信模块。汇聚节点采用ARM9系列S3C2410作为微处理器,采用CC2420作为通信模块。对节点的硬件结构和软件流程进行了设计。最后,通过实验对网络中节点数据采集精度、节点功耗以及节点丢包率等进行了仿真和分析,结果证明,设计的节点能满足环境监测物联网的需要,具有数据采集精度高、功耗和成本低以及可靠性强的优点。     

井下分布式无线应力监测系统设计

为解决煤矿下现有集中式控制应力监测系统可靠性差、施工困难的问题,基于分布式控制无线传感器网络,设计了适用于煤矿下复杂环境的分布式应力监测通信系统,详细介绍了系统总体结构、硬件电路及软件设计。以分布式无线Zig Bee为核心设计无线终端采集节点,实时获取井下支护设备应力。协调器节点数据通过CAN总线上传至上位机后进行数据处理。实验测试表明,系统实时性好,可靠性强,能够满足实际监测需求。     

无线传感器网络在油气井远程监测系统中的应用

针对油气井远程监测中面临的监测点分散、布线困难和实时性差等特点,提出了利用具有节点功耗低、工作时间长、成本低、能自组织地通信以及在危险区域和大面积监测中容易布置等特点的无线传感器网络,对油气井中不同深度地层的温度、压力进行实时监测的方法。并着重讨论了该系统无线传感器网络体系结构、网络节点的构成,以及数据采集和无线传输的实现。     

无线传感器网络中的传感器节点分组控制策略

研究无线传感器网络(WSNs)的传感器节点分组控制策略和软件实现方法。针对WSNs通信问题和分布监测的实际需求,制定传感器节点分组控制策略、单元组的模块化控制流程以及故障处理方法,保证多节点监测独立性、相关节点采集同步性以及数据传输可靠性。在程序实现方面,建立通信接口层、消息分发层、策略控制层组成的软件架构,实现WSNs远程控制软件,并进行了多传感器节点控制和数据传输可靠性的测试实验。     

基于msstatePAN协议栈的无线传感器网络设计

本文介绍一种采用msstatePAN协议栈和嵌入式技术开发的无线传感器网络,重点介绍了msstatePAN协议栈下应用程序的设计,该网络由Modbus TCP无线基站、无线路由和无线传感器节点组成树形拓扑结构,系统传输速率可达250kbps,节点数可达上百个,节点功耗小于10mW,通过增加无线路由通信距离可达几公里,能广泛应用于精准农业、环境监测等领域。     

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。     

基于QTE的蒙古文显示机制研究与实现

蒙古语言是中国蒙古族使用的通用语言,由于蒙古文区别于其他文字的书写方式和其自身变形机制等特点,在很多通用的文字处理引擎中都不被支持。在嵌入式产品开发与应用领域中Linux加QTE已经成为流行方式。该文给出了一种在QTE环境上实现基于标准Unicode的蒙古文点阵显示和变形算法, 并自定义了支持蒙古文的QTE组件,扩展了QTE功能,为在Linux加QTE方式的嵌入式体系结构中处理蒙古文提供了一种解决方法。