铁路通信传输的构成及实现方法研究

随着技术与经济的发展,我国的铁路运输速度和效率都有了显著的提高。铁路通信传输系统能够为铁路系统中的各项工作提供通道支持,是整个铁路系统中的重要组成。文章介绍了铁路通信传输系统的现状和构成,并对其实现方式进行了分析。     

铁路通信网中传输设备割接方案的研究

随着科技的发展,为满足人们出行的方便与安全,铁路通信系统中的传输设备也朝着更加全面、完善的方向进行发展。基于我国目前的形势来看,铁路通信系统传输设备因为不断地升级与改造,已经进入到了设备割接的高峰阶段,而由于铁路通信网中传输设备的割接与铁路行车的安全有着直接的关系,因此确定一个科学合理的铁路通信网传输设备割接方案,便显得尤为重要。本文主要就针对我国铁路通信网中传输设备常见的割接方案进行研究,并对其割接全过程进行详细的论述。     

铁路区间光纤通信系统研究

针对我国铁路区间通信系统现状,提出了基于光时分多址接入方式对目前铁路区间铜芯电缆通信系统进行光纤化升级.并阐述了铁路区间光纤传输系统中的区间设备和端站设备的设计原理与实现,为铁路区间语音和数据信号采用全光链路进行传输以及信息的交换和控制等功能提供了解决方案.     

铁路通信传输网络优化的必要性及保护方法

铁路通信网络对铁路运输具有非常重要的作用.特别是近年来我国现代铁路系统的快速发展,这也对铁路通信传输网络提出了更高的要求,稳定、可靠及畅通的铁路通信传输网络是铁路安全运输的重要保障.文中从铁路通信传输网络的概况入手,分析了铁路通信传输网络优化的必要性,并进一步对铁路通信传输网络的保护方法进行了具体阐述.     

关于如何有效清除传输系统无效告警的思考

传输系统作为铁路各类业务系统的承载系统,传输系统的稳定直接决定其它铁路系统能否安全运行,如数调系统、信号TDCS系统、客票系统、客票实名制系统、路局信息系统等重要铁路系统。     

铁路通信传输系统安全与发展

想要确保铁路通信的安全,就需全面把握铁路通信运输的实际情况,在提高传输效率的过程中加大对通信传输安全系统的维护力度,从而保障铁路通信系统的健康顺利运行.     

铁路大型电子DCS通信系统的优化设计与实现

由于铁路运输中存在较多的影响因素,传统铁路大型电子通信系统无法有效保障铁路运输安全。因此,构建能够有效提升铁路运输安全性能的铁路大型电子DCS通信系统。该系统由通信主站模块、通信从站模块和信号采集模块组成。通信主站模块利用TMS570LS技术获取对铁路车站联锁的管理命令,并将其传输到通信从站模块。通信从站模块根据管理命令管理铁路车站联锁,并进行信号采集模块的驱动工作。信号采集模块被驱动后,开始采集铁路车站联锁信号。通信从站模块和信号采集模块中的信号均传输到通信主站模块进行统一的分析、优化和预警。系统软件部分设计了信号传输损耗函数以及系统存储器优化语言。实验结果表明,所设计的系统能够有效提升铁路运输安全性能,增加铁路车站通车量。     

铁路通信传输组网安全的思考

随着铁路动车和高铁的发展,使得保证铁路运输的通信安全问题层出不穷。因此,在通信传输安全问题严峻情况下,需要进一步的加强和改善。想要确保铁路通信的安全,就需全面把握铁路通信运输的实际情况,在提高传输效率的过程中加大对通信传输安全系统的维护力度,从而保障铁路通信系统的健康顺利运行。     

铁路通信传输的构成及实现方法

随着我国通信技术和铁路事业的发展,我国的铁路列车向高速化方向的迈进。通信传输作为铁路系统中的重要组成部分,为铁路系统中的各项工作提供通道支持,在保证人机控制和提高运输效率方面起着关键作用。鉴于此,本文对铁路通信传输的构成及实现方法进行了探讨。     

浅谈GSM-R铁路数字移动通信系统测试

GSM-R铁路数字移动通信系统,是一项用于铁路通信及应用的国际无线通信标准。GSM-R提供了一系列铁路语音通信业务,传输与列车操作、控制和保护相关的指令,并保证列车在高速运行的情况下仍能够进行高可靠性、高接通率、高传输质量的通信。本文对昆明南站所使用的GSM-R铁路数字移动通信系统进行实地测试,掌握了其信号特征及相关规律,为今后开展相关工作提供了一定参考价值。     

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.     

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     

Call for Papers—Feature Topic,Vol.12,No.7,2015

正Information Centric Networking Information-Centric Networking(ICN) is an emerging direction in Future Internet architecture research,gaining significant tractions among academia and industry.Aiming to replace the conventional host-to-host communication model by a data-centric model,ICN treats data content as the first