康特互动电视在SCTVF2007独领风骚

2007年10月28～30日，中国广电行业盛会——第九届四川电视节（SCTVF）在四川成都沙湾国际会展中心隆重举行。在SCTVF2007上，康特展示了五大类产品线，包括互动电视资讯系统ITIS（Interactive TV InformationSystem，简称ITIS，下同），基于双向HFC网络的数据系统（EPON＋EOC），国标地面（移动）数字电视及单向数字电视系统（包括支持同密的CA系统、SMS及全套硬件设备），无线数字发射产品及数字电视测试仪器等。     

A Multisymplectic Variational Framework for the Nonlinear Elastic Wave Equation

A multisymplectic variational internal energy corresponding equation, its associated local framework for the nonlinear elastic wave equation is presented. The modified to the approximate nonlinea.r elastic wave equation is derived, we obtain the energy and momentum conservation laws as well as the multisymplectic form simultaneously directly from the variational principle     

TV信号的多路传输及带宽压缩

本文阐述了时间压缩信号及其频谱、各种差分信号的产生方法及频带压缩过程.最后对图象带宽为4.2MHz的TV系统用8.4MHz带宽传送三个TV信号的具体执行力式作了介绍.     

Topological Properties of Urban Public Traffic Networks in Chinese Top-Ten Biggest Cities

We investigate the topological characteristics of complex networks as exemplified by the urban public traffic network （UPTN） in Chinese top-ten biggest cities. It is found that the UPTNs have small world behaviour, by the examination of their topological parameters. The quantitative analysis of the transport efficiency of the UPTNs reveals their higher local efficiency El and lower global efficiency Eg, which coincide well with the status quo of those Chinese cities still at their developing stage. Furthermore, the topological properties of efficiency in the UPTNs are also examined, and the findings indicate that, on the one hand, the UPTNs show robustness to random attacks and frangibility to malicious attacks on a global scale; on the other hand, the interrelation between UPTN efficiency and network motifs deserves our attention. The motifs which interrelate the UPTN efficiency are always triangular-formed patterns, e.g. motifs ID 238, ID 174 and ID 102, etc.     

Pregelation Behaviour of Coagulation Processes with the Constant-Reaction-Number Kernel

We propose an irreversible binary coagulation model with a constant-reaction-number kernel, in which, among all the possible binary coagulation reactions, only p reactions are permitted to take place at every time. By means of the generalized rate equation we investigate the kinetic behaviour of the system with the reaction rate kernel K（i;j） = （ij）^w （0 ≤w〈1/2）, at which an i-mer and a j-mer coagulate together to form a large one. It is found that for such a system there always exists a gelation transition at a finte time to, which is in contrast to the ordinary binary coagulation with the same rate kernel. Moreover, the pre-gelation behaviour of the cluster size distribution near the gelation point falls in a scaling regime and the typical cluster size grows as （to - t）-1/（1-2w）. On the other hand, our model can also provide some predictions for the evolution of the cluster distribution in multicomponent complex networks.     

日本OKI公司首次出展CCBN2007

在今年的CCBN展馆里，记者欣喜地看到了日本通信设备专业厂商——冲电气工业株式会社（OKI）的展台。这次OKI出展的主要内容是适用于机卡分离型数字电视机顶盒的CA卡；针对中国市场能将CATV网与IP网融合的混合型机顶盒和高端IP机顶盒；以及为实现舒适，安全家庭生活环境的“下一代数字家庭网络解决方案”的理念。     

无限的无线：华硕WL-500g Premium/WL-100GE无线套装

你知道Afterburner技术吗，简单的说，它可以让基于IEEEE802.11g标准的无线网络速度提升到最高125Mbps的程度，在IEEE802.11n还没有普及前，这种过渡方案是你将无线网络速度超越100Mbps大关的最便捷途径.     

华为信息

华为NGN年度巡检全面展开：近日，华为NGN年度巡检全面展开。继2006年春节，华为NGN服务以来，华为NGN已服务于国内1．5亿用户，经受国庆、中秋等大话务量考验，网络运行稳定。     

新桥镇规范化建设和管理有线电视的几点经验

台州市新桥镇农村有线电视网络建于当地有线电视向农村大规模普及的1999年,包括集镇在内的总用户数从当时的4 000多户穿插发展到现在的7 500多户,但至今没有进行过网络的调整或改造,仍然保持优质运行状态,不仅近期可以平稳实施数字电视的平移转换,而且只要电缆外护套不开裂进水     

HFC架构升级的新思路

随着三网融合的逐步实现，广电视频业务逐步由垄断变为竞争，网络经营者如何利用HFC网络同轴电缆的宽带优势，快速低成本地构建承载全业务的网络，灵活地接入用户，较快地开展综合业务，这是至关重要的，提出Fiber Deepeerwei的技术理念与运用Vhub和数字化手段构建符合下一代有线电视网络标准的基础物理网络平台的新思路。