浅谈基于C-DOCSIS的网络适应性测试

一前言 由于市场竞争压力越来越大．且市场在向三网融合方向演进，中国的有线电视运营商正在为“最后100米”接入寻求基于标准的、既经济又能适应未来变化的技术解决方案。上述需求的主要原因是，未来网络需要以更大的带宽传输互联网内容、视频和语音业务数据包。     

DOCSIS2.0标准CMTS的测试与分析

本文对DOCSIS2．0标准的主要特征进行了分析．同时给出了在现有测试环境下较为准确的测定CMTS指标的方案，并对实际测量结果进行了分析。     

DOCSIS3．0标准的研究与应用

随着有线电视数据业务的发展，DOCSIS2．0标准在部署及运行中已经逐渐不能满足运营商业务发展的需要，DOCSIS3．0标准解决了这些问题。这一新标准能够在降低建设成本的前提下，提供更高的带宽、更优的质量和多业务提供能力，其主要特点在于去耦合设计、通道绑定和模块式构架等。     

HFC-IP电话网络系统

阐述了基于DOCSIS1．1规范的数据电缆网络IP电话系统的体系结构框架及主要功能组件，介绍了相关信令接口。     

DVB—RC与DOCSIS的比较

本针对目前交互式有线电视系统的两种主要标准DVB－RC和DOCSIS进行了技术，应用等各个方面的综合比较。     

特殊情况下CMTS的处理方法

本文主要介绍了江门广播电视台网络中心使用CMTS的情况，并介绍几个特殊情况下CMTS的处理方法。     

有线宽带的网络架构与上网原理

本文主要介绍了有线宽带的网络架构,有线宽带使用的DOCSIS系统与相关协议以及CM的上线过程,供广大同行参考。     

CM 组播技术研究及测试方案

以Broadcom公司生产的Cable Modem专用芯片BCM3383为基础，以eCos为开发平台，开发了基于DOCSIS 3．0的高性能Cable Modem产品，此产品主要拥有Residential Gateway、WiFi、MTA等功能模块，主要研究Cable Modem在HFC网络中对组播功能的支持，并且提出组播测试方案。     

DOCSIS2．0标准上行信道射频接口技术分析

主要介绍了DOCSIS2.0标准中上行信道的技术要求,详细分析了A-TDMA和S-CDMA两种接入方式的原理,并对两种方式的优缺点进行了完整性比较.     

哈雷：CCAP和MiNi-CMTS齐头并进

CCAP是国际上大热的话题。而C—DOCSIS是国内大热的话题，这两种产品在哈雷今年的展台上都被放到了重要位置，显然是哈雷的重点所在。     

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.     

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.     

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.     

小信号多腔速调管主要性能指标简化分析

介绍了速调管在我国的发展现状和小信号条件下速调管的各种主要性能指标的简化分析方法。在这种简化分析方法中,首先不考虑非线性和相对论效应等带来的影响,并把多腔速调管看作是几个双腔速调管的级联,得出了增益、效率、带宽和输出功率等重要参数的计算公式。然后通过给出部分参数的修正系数说明了这种简化分析方法的实用价值及理论指导意义。     

耦合电感型Zeta变换器的参数优化方法

针对耦合电感型Zeta变换器的开环频率特性复杂导致的控制器设计困难的问题,文中提出了变换器参数的优化方法。该方法通过调整变换器的电路参数,进而调整变换器幅频特性中的高频谐振峰与谐振谷的位置,使得峰谷之间相互削弱,把相频特性曲线上超过180°部分最大程度减小到180°以内,消除了输出电压响应中的高频振荡成分,降低了变换器从控制变量到输出电压之间的频率特性的复杂程度。测试结果表明,通过该方法进行参数优化后,控制变量到输出电压之间的幅频特性接近二阶系统的幅频特性,相频特性上的相位滞后小于180°。在采用相同控制器的条件下,与优化前相比较,利用文中方法提高了控制器的带宽,改善了系统的输出电压的动态响应,增强了闭环系统的稳定性,验证了所提方法的有效性。     

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.     

Molecular dynamics study on compressive strength of monocrystalline, nanocrystalline and amorphous Si mold for nanoimprint lithography

Molecular dynamics studies are carried out to investigate the compressive strengths and the failure mechanisms of monocrystalline, nanocrystalline and amorphous Si molds for nanoimprint lithography. The stress-strain characteristics and the stress distributions are analyzed for the three types of Si molds. The stress-strain characteristics show that the strength of the monocrystalline Si mold is the greatest among the three types of Si molds. The strength of the nanocrystalline Si mold decreases as the grain size decreases. This shows the Hall-Petch effect does not hold true in the grain size of nanometer order. The visualization of the stress distribution shows that the monocrystalline, nanocrystalline and amorphous Si mold fail due to the slipping of the specific atomic plane, the sliding in the grain boundaries and the nonlocal plastic deformation, respectively. As a result, the monocrystalline Si mold is the most suitable for nanoimprint lithography among the three types of Si molds in the nanoscale regime.     

Noise character analysis and the restraint of self-pulsation laser diodes

We calculate the Langevin noise sources of self-pulsation laser diodes, analyze the effects of active region noise and saturable-absorption region noise on the power fluctuation as well as period fluctuation, and propose a novel method to restrain the noise effects. A visible SIMULINK model is established to simulate the system, The results indicate that the effects of noise in absorption region can be ignored; that with the increase of DC injecting current, the noise effects enhance power jitter, and nevertheless, the period jitter is decreased; and that with external sinusoidal current modulating the self-pulsation laser diode, the noise-induced power jitter and period jitter can be suppressed greatly. This work is valuable for clock recovery in all-optical network.     

胆小管超微细胞酶学研究

以电镜细胞化学的方法,观察了小鼠胆小管酶的分布。观察的12种酶中,NDPase和G6Pase三种酶分布于胆小管微绒毛;AlPase、Na~+-K~+ATPase、Mg~(++)-ATPase、Ca~(++)-ATPase、CMPase、ACase和5＇-Nase等7种酶分布于胆小管微绒毛,也分布于肝细胞邻接面细胞膜和Disse间隙微绒毛;ACPase、细胞色素氧化酶以及线粒体ATPase不分布胆小管微绒毛,也不分布Disse间隙微绒毛和肝细胞膜。据信,胆小管微绒毛上的酶参与胆汁成份的转运,提供转运所需能量以及还可能与某些代谢过程有关。本实验中磷酸水解酶类使用的铈基法及亚铁氰化钾半还原的锇酸后固定法,效果优于铅法。     

简述UPS的集成化发展趋势

随着信息技术的发展,UPS(不间断电源)系统的应用越来越广泛,系统的发展趋势是提高可用性和可靠性,实现集成化。数字化的语言、文字、图像等信息产品迅速普及,网络传输中数字接口的接入网技术的成熟,将电信网、计算机网和广播电视网融合为一的“三合一”工程已进入实质性运作阶段。在这个变化中,电源保护也经历了由点到面的转变,以及从对硬件和数据的保护扩展到对整个网络可用性的保护。为了适应这种变化的需要,UPS系统变得越来越复杂。使用者在设计和构建UPS系统过程中,以及在长期使用维护中发现,UPS设备仅仅是整个系统的一个核心环节,供电系统设计的合理性以及系统中其他环节和设备的质量,不仅会直接影响系统的可用性和供电质量,同时还直接或间接地影响了UPS设备运行的可靠性。