蓝牙技术介绍及前景展望

蓝牙是一种新型的短距离无线连接技术,作为一种短程无线数据传输标准,蓝牙有着广泛的应用前景。本文首先介绍了蓝牙技术,然后介绍了蓝牙的应用场合,最后展望了蓝牙的发展前景。     

蓝牙技术的应用

文章简要介绍了一种短距离无线连接技术——蓝牙技术的应用。蓝牙技术是近几年出现的一种工作在2.4G的ISM频段的无线连接技术,它用无线接口取代现有的有线电缆在各种数据设备间传输数据。蓝牙的应用很广,该文着重阐述了几个蓝牙应用模型:蓝牙耳机应用,蓝牙无绳电话应用,蓝牙传真应用,蓝牙拨号网络应用及蓝牙文件传输应用。根据蓝牙应用模型,该文介绍了蓝牙在实际生活中的商业应用:蓝牙耳机,蓝牙无绳电话,无线调制解调器,支持蓝牙的计算机及其他外设。最后,文章指出了蓝牙发展应用中有待提高的几点技术缺陷。     

蓝牙技术介绍及前景展望

蓝牙是一种新型的短距离无线连接技术,作为一种短程无线数据传输标准,蓝牙有着广泛的应用前景。本首先介绍了蓝牙技术,然后介绍了蓝牙的应用场合,最后展望了蓝牙的发展前景。     

蓝牙技术在电梯断电平层控制中的应用

蓝牙技术作为一种新的短距离无线数据通信．统,是顺应时代的发展。文中在现有电梯控制特点的基础上．绍了该套方案的硬件组成和电梯与蓝牙接入设备的通信流程。迅速应用于控制领域。将蓝牙技术应用于电梯断电平层控制系设计了一种利用蓝牙技术的电梯断电平层控制方案,详尽地介为蓝牙技术在电梯控制方面的应用提供了很大的参考价值。     

蓝芽引领个人化无线网络

蓝牙作为一种新兴的个人区域无线通信技术 ,受到了人们的广泛关注。随着研究的进展 ,蓝牙技术的应用领域逐渐得到了扩展。为了让更多的人全面了解蓝牙技术及其应用 ,正确引导和规范蓝牙技术产业 ,我刊特邀请了有关专家和研发人员从我国对蓝牙频谱管理的策略、蓝牙技术在我国的发展现状和科研进展情况、蓝牙的频率和跳频技术以及蓝牙技术的安全性等方面介绍蓝牙技术 ,以促进蓝牙技术的正确应用与发展。     

蓝牙技术讲座 第1讲 蓝牙技术的发展与技术标准

蓝牙技术是一种无线数据和语音通信的开放性全球规范,其目的是实现各种电子设备的低成本、短距离的无线连接。本文介绍了蓝牙技术的发展概况、蓝牙技术的优点和特点以及蓝牙技术的主要标准。     

基于蓝牙技术的无线信号检测系统的实现

蓝牙技术是一种无线数据和语音通信的开放性全球规范,其目的是实现各种电子设备的低成本、短距离的无线连接。从应用的角度将蓝牙模块作为通讯模块集成到系统中为出发点,讨论和研究了蓝牙技术在检测领域中的应用。给出了一种基于蓝牙技术的无线信号检测系统的设计方案,并详细说明了该系统硬件电路设计和蓝牙HCI接口的软件实现方法。     

基于蓝牙的无线个域网安全性研究

蓝牙技术是一种飞速发展的近距离无线通信技术．在无线个域网的构建过程中获得了越来越广泛的应用。本文以蓝牙设备构建无线个域网面临的网络安全问题为基点,分析了基于蓝牙技术的无线个域网安全模式,探讨了蓝牙密钥管理技术和加密算法。     

无线售票系统

介绍了蓝牙(Bluetooth)技术的基本概念和技术特征,分析了目前比较常见的售票系统的某些缺陷。根据蓝牙设备的技术特点,设计了一种利用蓝牙手机与电脑进行无线连接,通过蓝牙手机进行无线上网,实现增设临时售票网点的方案。此外,比较详细地描述了方案实施过程中,如何为普通电脑增加蓝牙功能、如何对不同的蓝牙设备进行配对以及蓝牙手机无线上网的具体方法。     

蓝牙安全研究

蓝牙技术作为一种近距离无线通信的技术,已被许多国家和企业支持和认可。分析了蓝牙设备和蓝牙网络的安全机制及亟待解决的问题,并给出了具体的加密解决方案。     

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