基于BACnet/IP协议智能楼宇网关系统功能设计

分析了传统楼宇自控系统的不足之处以及对智能化集中式楼宇自控系统的需求,并详细阐述了文章设计的智能楼宇网关系统的功能需求和系统设计的方案。本智能楼宇网关系统基于Web服务技术架构,主要实现BACnet协议栈解析、自动轮询推送、远程在线配置、BACnet对象读写以及日志管理、异常管理等功能。     

基于BACnet/XML的BACnet/WS集成模型的设计与实现

本文基于BACnet/XML协议和BACnet/WS接口标准,提出了一种全新的智能楼宇集成模型,设计和实现了集成模型中的核心BACnet/WS服务组件,通过理论分析和仿真测试验证了集成模型具有良好的系统性能,从而较好地解决了智能楼宇领域中的这一难题.     

说话人识别技术在智能家居中的应用

结合智能型楼宇控制系统的特点以及以人为本的理念,提出了一种用DSP实现的说话人识别实时系统．并结合楼宇自动控制网络(BACnet)协议,将系统设计为BACnet设备的一个嵌入式子系统,从而将语音识别技术应用到智能家居控制系统中。     

楼宇自控系统中BACnet网络节点平台的开发

针对楼宇自动化中BACnet协议的实现及协议栈移植的问题,提出了对协议栈交互模型简要的设计方法,介绍了移植到STM32开发板的过程。该方法分析了协议结构中应用层、网络层和数据链路层的实现过程。移植以BACnet-stack-0.8.2版本源代码为样本,根据标准对象的功能需求和硬件配置对BACnet协议栈进行剪裁和移植。实验结果使STM32开发板成为一个BACnet网络节点设备,能通过RS485与PC机上的虚拟设备进行通信,具有读写属性等服务的能力。     

基于BACnet的全光网络家庭信息中心

随着信息技术的发展，智能家庭信息平台已经成为新一代信息设备的主流。家庭信息中心（HIC）的开发涉及到各种不同的控制和通信系统的集成，因此用开放协议楼宇自动化与控制网络（BACnet）标准来开发智能家庭信息平台对集成各种系统有很大的帮助，为此提出了把光纤通信技术融入智能家庭信息中心的技术方案，阐述了粗波分复用（CWDM）在全光接入网的应用以及现代智能家庭信息中心的概念，分析了智能家庭信息中心全光化的可行性及其优点，最后展望了未来智能全光家庭信息中心的发展趋势。     

语音识别技术在楼宇控制系统中的应用

由于受识别率较低和计算量大的限制，语音识别的应用一直难以推广。根据楼宇控制系统的特点，文中提出了一种用DSP实现的数字连接词的语音识别实时系统，并结合BACnet协议，把系统设计成BACnet设备的一个嵌入式系统，从而把语音识别应用到楼宇控制系统中。     

基于身份认证的BACnet/IP分析与改进

为了解决BACnet/IP身份认证存在多种可攻击漏洞和密钥泄露带来的安全问题,提出了一种安全增强的BACnet/IP-SA协议认证方案。研究协议身份认证消息流模型,基于着色Petri网理论和CPNTools对身份认证消息流建模,采用Dolev-Yao攻击者模型和形式化分析方法对BACnet/IP进行安全性分析,发现协议漏洞并提出改进方案。BACnet/IP-SA协议使用设备的伪身份来保护真实身份信息,使用PUF响应进行认证,通过多信息集合的验证值来验证端身份的真实性并生成会话密钥。结合BAN逻辑和非形式化方法,对协议的安全性进行了证明。实验结果表明,所提方案能有效抵抗多类攻击和密钥泄露带来的安全威胁,在减少计算开销的同时增强了协议身份认证的安全性。     

蓝牙接入BACnet的智能家居技术设计与实现

本文介绍了蓝牙技术、BACnet协议和蓝牙智能家居局域网的概念.提出了一种将基于蓝牙技术的个人区域网(PAN)与基于BACnet的小区内部局域网相连接的解决方案,讨论了算法实现步骤、协议软件连接和系统硬件构成.     

国际新闻

正VACON成为BACnet国际的金牌会员-改善楼宇自动化的舒适性控制http://www.vacon.com2014年6月26日,全球交流驱动器制造商Vacon作为金牌会员加入全球90多家领先的楼宇自动化供应商和集成商以推广使用BACnet作为通信协议。BACnet是Vacon在其交流传动产品中作为标准完全支持的适用于楼宇自动化市场的主要通信协议之一。VACON提供VACON 100 HVAC和VACON 100 X系列产品用于楼宇自动化和暖通空调应用。这些交流驱动器改善舒适度控制,并通过泵和风机的智能调速来实现大量的节能。     

基于ZigBee的智能楼宇控制

新的ZigBee协议在无线传感器网络和各种无线终端控制方面有良好的前景,基于无线技术的门禁与其它无线通信技术相比,ZigBee更有能力胜任门禁系统的通信。文章以智能门控系统为研究方向,并结合新兴ZigBee技术,提出利用ZigBee技术的智能楼宇门控系统,为传感器网络和控制设备提出了新的方案。     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

A rigorous proof of MIMO channel capacity’s increase with antenna number

It is well known that adding more antennas at the transmitter or at the receiver may offer larger channel capacity in the multiple-input multiple-output（MIMO） communication systems. In this letter, a simple proof is presented for the fact that the channel capacity increases with an increase in the number of receiving antennas. The proof is based on the famous capacity formula of Foschini and Gans with matrix theory.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks