利用环境余热供电的无线温度测量系统设计

无线测量节点的供电是无线测量系统在实际应用中受限制的主要问题之一.为解决此问题提出了一种收集工业生产现场环境余热并转换成电能为无线测量节点供电的方法.设计了由多个无线温度测量节点和一个Sink节点组成的无线温度测量系统.无线温度测量节点以CC2530为核心处理器,用热电偶测量温度,节点电源由能量收集模块供给.能量收集模块用热电片收集环境余热,以LTC3109为核心构成电源管理模块从而获得3.3 V输出电压.设计了上位机软件实时显示和保存Sink节点收到的各测温节点的温度数据.实验表明,在一定环境条件下能量收集模块可以为无线温度测量节点提供工作电源,为无线测量节点供电提供了一种参考解决方案.     

低功耗WSN节点及其接口协议的设计

提出了一种基于MSP430和CC2530的低功耗无线传感器网络节点的设计方法。从硬件和软件两个方面阐述了这种设计方法及其具体实现,通过实验完成了对节点消耗电流的测量和分析。应用结果表明,采用这种方法设计的节点能够在低功耗的条件下稳定可靠地工作。     

基于Zigbee的无线粮情监控网络中测量节点的设计

针对传统有线粮情监控系统存在的缺陷,提出"平面分离、上下贯通"的无线粮情监控网络的设计思路,实现了设计目标的基本单元测量杆的功能结构,规划了基于Zigbee的无线粮仓温湿度监控网络.根据节能需求将无线监控网络中的节点分为测量节点和路由节点,完成了测量节点的接口电路和主程序设计,并对测量节点中的关键技术进行了阐述.     

一种无线传感器网络低功耗节点的设计

节点的功耗大小决定着整个无线传感器网络的生命周期,因此,节点的低功耗设计尤为重要;在简单介绍分析各节点设计解决方案及其特点的基础上,分析了无线传感网络系统中低功耗节点设计方案、关键芯片选择、设计及其实现,重点阐述了低功耗控制设计及其实现方法,最后,完成了不同工作条件下的节点消耗电流测量和分析;实验结果表明,提出的节点设计方案在保证低功耗特性的同时,兼具良好通信性能.     

基于ZigBee的煤矿巷道压力监测系统设计

针对传统的巷道压力监测方法存在测量精度低、可靠性差、节点扩展性差、测量结果无法自动上传、分析和处理等问题,设计了一种基于ZigBee的煤矿巷道压力监测系统。该系统利用传感器节点实现巷道压力的精确测量,测量结果以无线通信方式传送给汇聚节点,并由汇聚节点上传地面监控计算机,实现巷道压力的实时、可靠监测。测试结果表明,该系统可实现锚杆受力大小的精密测量,并可实时上传测量结果。     

粮仓无线测量节点的低功耗设计

在粮仓无线测量系统的设计中,测量节点由电池供电,它的低功耗设计是系统能否实用的关健技术之一.首先简单介绍节点的主要器件和工作流程,然后根据器件本身节能模式的特点,针对粮仓的实际应用要求,提出测量节点基于睡眠/唤醒的低功耗软硬件方案.经过实践证明,该方案能极大地降低节点日常工作能耗,延长节点生存周期.     

三维传感网空间RSS与AOA混合测量的精确定位方法

由于位置坐标参数的增加,三维传感网空间的定位难度较二维平面有所增大.单一的依靠接收信号强度(RSS)确定节点位置坐标的方法将使定位的不确定性增加,定位误差也较大.新型的阵列与智能天线的出现为节点间的到达角度(AOA)测量提供了方便,为此本文提出了一种三维传感网空间RSS与AOA混合测量的精确定位方法.将采用混合测量建立的非线性优化模型转化为线性方程,分别提出了节点位置坐标估计的非约束线性最小二乘(ULLS)及约束线性最小二乘(CLLS)方法.仿真测试了所设计算法的有效性,分析了不同测量噪声对位置坐标估计误差的影响.仿真表明所设计的ULLS和CLLS方法的计算速度快,相比于ULLS方法,采用约束后的CLLS方法的定位误差更小.在较小测量噪声范围内,ULLS和CLLS估计方法具有较高的稳定性和定位精度.     

一种传感网时间同步和定位的联合线性估计方法

采用时间测量以估计节点位置的方法实现简单,在传感网中得到了广泛的使用。然而节点计时时钟存在漂移和偏离,导致时间测量不准确。为此文本以节点时钟漂移和偏离模型为基础,提出了一种时间同步和节点定位的联合线性估计方法,包括最小平方（LS）及权重最小平方（WLS）方法。仿真测试了所设计算法的运行时间,分析了噪声对联合估计方法的估计误差影响。结果表明,LS及WLS线性估计方法运算速度较半正定（SDP）算法快,在低噪声条件下LS及WLS线性估计方法具有较高的稳定性和定位精度。     

无线温湿度传感器网络节点的设计

将无线传感器网络技术应用于温湿度测量,实现远程实时监控,设计了基于无线收发芯片nRF401的现场温湿度测量的无线传感器网络节点,详细介绍了节点系统的软硬件实现。     

无线传感器网络节点能耗测量及分析

传感网能量高效是无线传感器网络研究中的关键性问题,而对节点能耗的准确测量评估是基础。现有的传感器网络节点能量测试方法,难以满足长时间、细粒度和高精确的测量需求。设计了一款传感器网络节点能耗测量设备,它利用电流采样、高速模拟数字转换芯片和可编程逻辑阵列构成的功耗测量电路实现对节点功能的准确和连续的测量,并对测量结果进行进一步分析。结果表明,该功耗测量设备符合传感网节点的实际运行情况,测量结果为传感器网络节点在线的能耗评估提供了数据依据。     

Controlling the order of moves in voting by veto. II. Algorithms for constructing an optimal order of moves

The study of issues concerning collective decision-making in complex systems using voting by veto is continued. A dedicated player is assumed to exist in the collective that forms the order of voting (order of moves) for the other participants. The problem of searching for the control strategy for the order of moves that ensures the win of alternative 1 that is preferable for the dedicated player is studied for the previously unstudied cases when such an order of moves exists. In particular, an algorithm for constructing such an order is proposed for the case when there is another participant for which alternative 1 is higher than the fourth from the end and when there is a group of participants that are relatively well-disposed to alternative 1 (more precisely, this alternative is higher than the third from the end for them). It is shown that the preference order of the alternatives that are better than alternative 1 is of no importance for the problem under consideration. It is proved that the conditions for the participants’ preferences that are sufficient for the existence of the desired order of moves (they were obtained in the first part of this paper) are unimprovable.     

Solutions and Ambiguities of the Structure and Motion Problem for 1D Retinal Vision

In this paper we investigate the geometry and algebra of multiple one-dimensional projections of a two-dimensional environment. This is relevant for one-dimensional cameras, e.g. as used in certain autonomous guided vehicles. It is also relevant for understanding the projection of lines in ordinary vision. A third application is on ordinary vision of vehicles undergoing so called planar motion. The structure and motion problem for such cameras is studied and the two possible minimal cases is solved. The technique of solving these questions reveal interesting ambiguities. It is shown that for each solution with three images there is an ambiguous solution. It is also shown that for each solution for four points there is an ambiguous solution. The connection between these two different types of ambiguities is also given. Although the paper deals with calibrated cameras, it is shown that similar results exist for uncalibrated cameras.     

An omni-directional mobile millimeter-sized microrobot with 3-mm electromagnetic micromotors for a micro-factory

This paper presents an omni-directional mobile microrobot for micro-assembly in a micro-factory. A novel structure is designed for omni-directional movement with three normal wheels. The millimeter-sized microrobot is actuated by four electromagnetic micromotors whose size is 3.1 mm × 3.1 mm × 1.4 mm. Three of the micromotors are for translation and the other one is for steering. The micromotor rotors are designed as the wheels to reduce the microrobot volume. A piezoelectric micro-gripper is fabricated for grasping micro-parts. The corresponding kinematics matrix is analyzed to prove the omni-directional mobility. A control system composed of two CCD cameras, a host computer and circuit board is designed. The macro camera is for a global view and the micro camera is for local supervision. Unique location methods are proposed for different scenarios. A microstep control approach for the micromotors is presented to satisfy the requirement of high positioning accuracy. The experiment demonstrates the mobility of the microrobot and the validity of the control system.     

Integrated identification and robust control

A framework for integrated identification and control is presented. As part of this framework, frequency domain uncertainty bounds are derived for robust stability tests, a robust stability test for elliptical bounds is developed for SISO systems, a methodology for estimating controller performance is derived, and an optimal experiment design methodology for control-relevant identification is outlined. An example is presented to illustrate how the tools of the framework fit together.     

Dynamic policy in linear models with rational expectations of future events: A computer package

A computer package is presented, called POREM, for policy optimisation of linear dynamic, continuous-time models with constant coefficients and rational expectations of future events, based on infinite horizons and quadratic preferences. It is possible to calculate cooperative, decentralised Nash and decentralised Stackelberg outcomes and for each outcome it is possible to allow for pre-commitment and for lack of pre-commitment vis-à-vis private sector agents. It is possible to allow for hierarchical games, that is to allow for a group of Stackelberg leaders and a group of Stackelberg followers. The input of the model is very user-friendly and can be done with the aid of mnemonics. The package is programmed in PORTRAN77 and a single-precision version is available for personal computers     

基于复杂网络的情感分类特征选择

首先针对公共情感词典对专业领域适用性较低问题,以公共情感词典作为种子情感词典,以评论语料库中未出现在公共情感词典中的形容词作为候选情感词,在此基础之上利用点互信息理论构建专业领域的情感词典。其次针对在线评论情感分类问题,利用复杂网络理论提出了一种新的情感分类特征选择算法,改进了传统特征选择算法忽略特征语义相关信息,遗漏评论情感资源的问题。通过构建候选特征词关系网络,利用复杂网络节点重要性理论,考虑节点的局部和全局重要性,提出了利用网络节点的度中心性、介数中心性和接近中心性综合衡量节点重要性来选择情感分类特征的算法NTFS(Complex network feature selection)。最后以iPhone手机的在线评论为实验数据,利用SVM、NNET、NB分类器对比了NTFS、GI、CHI传统特征选择方法,实验证明NTFS在分类性能上优于GI,CHI算法。     

一种G2连续的二次曲线样条插值方法

给出了一种用二次曲线段来插值平面有序数据点列的一种方法 .文中的曲线采用隐函数表示而不是常用的参数形式 .曲线不是用通常的二曲线方程来表示 ,而是用一种带参数的函数样条来表示 .首先给出用二次曲线来插值两点、两切线以及在一端点处的曲率达到给定值 ;其次 ,给出了用二次曲线样条插值平面上一个有序点列且使曲线达到整体 G2 连续 ;最后就用二次曲线对平面闭曲线插值问题进行了研究 .该方法对数据点列没有任何限定性要求 ,无论是闭曲线还是开曲线 ,都能达到整体 G2连续 .     

条烟自动分拣机监控系统的设计

分析目前我国条烟分拣机的现状,并在此基础上开发了条烟高效自动分拣系统,简单介绍了条烟分拣系统,并对异步分拣法进行了阐述,设计了基于Profibus现场总线的监控系统,对硬件组成进行分析;研究了条烟分拣系统的控制策略,提出用"预测控制"下载订单,分析了上位机的软件系统,对条烟自动分拣机试验结果表明,该监控系统运行稳定可靠,效率高,具有一定的实用性和推广价值.     

基于Blackfin-uClinux嵌入式平台的设计与实现

提出了一种基于Blackfin-uClinux的嵌入式平台设计方案,选用ADI公司生产的16/32位高性能ADSP-BF533芯片为该平台的核心控制器.ADSP-BF533是针对嵌入式微控制而设计的数字信号处理芯片,详细介绍了该嵌入式平台部分的硬件电路设计,并且将嵌入式操作系统uClinux的移植到该平台上.该平台既可用于嵌入式系统的开发,也可以实现各种软件算法,有利于应用此类芯片的人员快速理解,为今后开发基于该平台的应用系统提供可靠参考.