An Intercommunication Home Energy Management System with Appliance Recognition in Home Network

In present days there are wide varieties of household electric appliances along with different power consumption habits of consumers, making identifying electric appliances without presetting difficulty. This paper introduces smart appliance management system to recognize electric appliances in home networks, which uses sensing devices that measure current to calculate the power consumption of the appliances. The system will set the characteristics and categories of each electric appliance, and then uses the classifications of the electronic energy features in order to recognize different appliances. The system searches the cluster data while eliminating noise for recognition functionality and error detection mechanism or the electric appliances using the current clustering algorithm. Afterwards the recognition are used to build a control list of appliances on the platform to provide appliance intercommunication. Simultaneously, the household appliance automatic control services are integrated by the system to control appliances based on userspower consumption plans to realize a bidirectional monitoring services. In actual experiments, the proposed system achieves a recognition rate or 95% as well as successfully controls general household electric appliances in home network.     

Nonintrusive measurements of the telephone channel

Algorithms for a system which performs in-service nonintrusive measurements of telephone line parameters such as echo path delay, echo attenuation, speech and noise levels are presented. It forms the theoretical background of a hardware implementation of the ITU-T P.561 recommendations for nonintrusive assessment of quality of a telephone network for voice transmissions. The type of input signal to the echo path, whether it is speech, fax, or data, has to be determined during the measurement procedure. In the system, the relevant parameters are estimated by means of frequency-domain block-processing algorithms and the estimation process is controlled by algorithms monitoring the signal flow. The complexity of the echo path estimation algorithm is determined and compared to a standard procedure based on the adaptive normalized least mean square (NMLS) algorithm. Simulations showing the performance of the system in single-and double-talk situations are presented. Examples of results from the hardware real-time implementation operating on an international connection are also shown     

多路遥控节能器设计

基于AT89S52单片机为核心设计的多路智能遥控节电器。通过检测用电器的电流判断各路上的用电器是否处于待机状态,处于待机状态的用电器将会进入设定的倒计时,倒计时的时间到将会断开该路用电器的电源.同时可用遥控器控制各路的用电器电源断开和闭合以及设置各路的待机时长。具有原理简单、控制方便、具有较高的性价比等优点。     

CCD在老式仪表改造中的应用

许多老式仪表均靠人眼读数，因此，许多工厂装有老式仪表的设备需要安排专人读表。系统在老式仪表原来的基础上，运用图像处理的方法对仪表进行简单改造，节省成本，实现实时监控、自动检测自动报警等多项功能。     

Infrastructure-Mediated Sensing Based Home Appliances Monitoring System Using the EMI Characteristics

An automatic monitoring system for home appliances using infrastructure-mediated sensing technology is presented. A practical solution for identifying the working states of electronic devices and determining the consumption of each device in a household is proposed. Initially, the components of Electromagnetic interference （EMI） noises in a residential power line are analyzed, and then the basic theory of Switched mode power supplies （SMPS） is discussed. Finally, a set of practical approaches has been proposed to detect and classify the electrical events, including a time-frequency transformation algorithm, power spectrum vector chasing, Gaussian function fitting and supervised pattern recognition, etc. The monitoring system has deployed into real houses and it successfully classifies SNIPS devices with accuracy from 92.6% to 99.2% for individual devices and 88.0% to 95.0% for multiple devices.     

Experiences from the design, deployment, and usage of the UCSB MeshNet testbed

In this article we report on our effort and experience in designing, deploying, and using our 30-node wireless mesh testbed, the University of California at Santa Barbara (UCSB) MeshNet. Compared to simulation, the construction and utilization of a wireless mesh testbed poses many new challenges. We discuss the challenges with distributed testbed management, nonintrusive and distributed monitoring, and node status visualization. These are vital components in a sustainable wireless mesh testbed, but at the same time nontrivial to design and. realize. As a case study, we present the UCSB MeshNet architecture, including its management, monitoring, and visualization systems. We share our lessons learned from this effort and believe that they are valuable to other researchers who develop experimental wireless mesh networks.     

基于Cortex-M3微处理器的智能家居监控终端的设计

在分析智能家居系统的组成和结构的基础上,提出了通过Internet网络对家用电器和安防设备进行远程监控的方法.给出了基于Cortex-M3微处理器的智能家居控制终端的硬件设计方案和实现方法,介绍了控制终端软件实现的原理和流程.本系统还专门设计了一款内嵌Zigbee模块的PDA方便用户在室内对家用电器进行控制.该系统结构...     

Automatic identification of impairments caused by intermodulationdistortion in cable television pictures

The authors study the feasibility of automatically monitoring a television picture for the purpose of knowing whether or not impairments resulting from intermodulation beats are present. They develop a mathematical model for the intermodulation beats and show that the theoretical results confirm the experimental ones. These results show that by using the two-dimensional discrete Fourier transform of a picture the automatic detection and recognition of intermodulation distortion is feasible. The results demonstrate, contrary to common belief, that it is possible to monitor the signal in a nonintrusive fashion     

Near-field electromagnetic tomography applied to current density reconstruction in metallized capacitors

A nonintrusive method of current cartography inside a component is presented. The measurement of the current density in metallized film capacitors has numerous applications, including nondestructive testing, new component design, and validation of existing models on current distribution in capacitors. The method is based upon the measurement of the magnetic field created by a capacitor and the current density reconstruction by means of inverse problem methodology. The experimental setup comprises of a radio-frequency generator operating between 10 to 1000 MHz, a near-field probe, an XY positioning table and a computer used for control and data acquisition. The first results confirm that, near some frequencies, the current density in the capacitor becomes nonhomogeneous and increases dramatically in some areas.     

On-Line Monitoring of Mechanical Faults in Variable-Speed Induction Motor Drives Using the Wigner Distribution

This paper deals with the detection of mechanical load faults in induction motors during speed transients. The detection strategy is based on stator current analysis. Mechanical load faults generally lead to load torque oscillations at specific frequencies related to the mechanical rotor speed. The torque oscillations produce a characteristic sinusoidal phase modulation of the stator current. Speed transients result in time-varying supply frequencies that prevent the use of classical, Fourier transform-based spectral estimation. This paper proposes the use of a time-frequency distribution, the Wigner Distribution, for stator current analysis. Fault indicators are extracted from the distribution for on-line condition monitoring. The proposed methods are implemented on a low-cost digital signal processor. Experimental results in a steady-state and during transients with load torque oscillations and load imbalance are presented.     

自动检测系统中的电流测量技术

根据自动检测系统中电流测量技术极少被采用的现状，提出利用电流产生的磁场进行电流测量的概念，详细阐述了一种基于电子束在被测电流生成的磁场中发生偏转的原理进行测量的非侵入式电流传感器，并讨论了这种电流测量技术所面临的问题，提出了相应的解决方案。最后提出有关电流数据和其他相关信号的分析方法以及电流测量的意义。     

Automatic fault detection, isolation, and recovery in transparentall-optical networks

Network fault identification is an important network management function, which is closely related to fault management and has an impact on other network management functions such as configuration management, and performance management. This paper investigates fault surveillance and fault identification mechanisms for a transparent optical network in which data travels optically from the source node to the destination node without going through any optical-to-electrical (O/E) or electrical-to-optical (E/O) conversion. Mechanisms and algorithms are proposed to detect and isolate faults such as fiber cuts, laser, receiver, or router failures. These mechanisms allow nonintrusive device monitoring without requiring any prior knowledge of the actual protocols being used in the data transmission     

红外焦平面器件二点多段非均匀性校正算法研究

分析了红外焦平面探测器的非均匀性机理和各种非均匀性校正算法，提出两点多段非均匀性校正算法，该算法避免了二点校正算法的低精度和多点校正算法的大运算量．在红外多谱段相机上的应用结果表明二点多段非均匀性校正算法具有运算量小、精度高、实用性强的优点。     

配电站安全监控技术应用研究

目前,业内人士对配电站监控系统功能与性能的要求日渐提高,因此有必要加强对配电站监控系统安全运行方面的研究。论文详细探讨了配电站安全监控技术的应用,在简单分析了当前配电站监控系统应用问题的基础上,重点研究了配电站监控网络系统的负载类型和负载流量,并有针对性的从监控实时性和可靠性两个方面提出了具体的配电站安全监控技术的应用,对于进一步提高配电站监控系统安全运行水平具有一定借鉴意义。     

An automatic load-adaptive switching frequency selection technique for improving the light-load efficiency of a buck converter

A load-adaptive automatic switching frequency selection scheme is proposed to improve the power efficiency of a switching buck converter at light load condition. The buck converter operates in the continuous-conduction mode for heavy loading and the switching frequency is fixed at its maximum value. For light loading, the buck converter operates in the discontinuous-conduction mode and its switching frequency is automatically selected among a pre-defined set of frequencies according to the amount of the load current. The load current can be sensed indirectly by monitoring the on-time of power transistor because it is a function of the load current. With the proposed load-adaptive automatic switching frequency selection circuit, the power efficiency of a buck converter implemented in a 0.35-μm 2P4M BCDMOS technology is improved by 24.0-% when the load current load is 10-mA.     

谐波电流的检测和对策

谐波电流指标是“3C”是重要检测内容之一，本文介绍了谐波电流标准及检测方法，分析了检测中的常见问题，并给出了相应对策。     

飞机发动机滑油在线监测系统电流源设计

针对飞机发动机润滑油在线监测系统中传感器的负载特性,基于DDS和电流反馈放大器设计了一个程控交流电流源.由MSP430单片机控制直接数字合成芯片,驱动电流反馈放大器AD844及高频运算放大器AD811构成精确程控电流源.当电感在1～2mH,激励频率在3kHz左右时,恒流源输出8mA电流并且幅值变化小于1％.     

Envelop tracking based embedded current measurement for monitoring of IGBT and power converter system

Health monitoring of the power conversion system is very important. Therefore, we developed a new method for measuring IGBT currents and reproducing average load current to monitor IGBTs. This method was successfully tested on an experimental setup which showed that the tiny PCB sensors can be integrated into intelligent power modules. We proposed an inexpensive analogue circuit which is suitable for capturing current information from a tiny PCB Rogowski coil. The sensors and corresponding circuit can be embedded into an Intelligent Power Module. The method was named “Envelop tracking” as it simultaneously measures the currents of the high and low side switches of a power converter and reproduces the upper and lower edges of the load current which can be averaged by further digital processing.     

基于GSM模块的智能控制系统

设计了一个基于GSM的家用电器及家居环境监控系统。系统主要由GSM模块TC35i、红外接收头、51单片机、DSl820温度传感器等构成。先通过红外接收头解析家电遥控器红外控制码,学习该遥控器。当系统中GSM模块接收到来自用户的短信时,系统解析出用户预控制家电的信息后,再通过红外发射管将对应的控制代码发射出去,从而达到监控家用电器的目的。     

一种嵌入式设备上的消除隐藏面的快速算法

从分析常用的消除隐藏面算法入手,提出了在嵌入式设备中绘制三维场景时候可以用来现快速消除隐藏面的算法。并在PS1的模拟器上实现,证明了算法的可行性。