提升宽带服务水平 再塑企业核心竞争力

重组后的电信企业已经进入了全业务运营时代,如何在融合的大趋势下,开展差异化服务是企业的战略核心内容,是提高客户忠诚度,减少客户流失的重要手段,也是运营商取得竞争优势的关键;介绍了推进差异化电信服务的意义,阐述了服务差异化的核心,及如何具体落实差异化服务创新举措。     

基于影像参数法的LC带通滤波器的设计及仿真

为了满足传流滤波器在高频、宽频领域的滤波要求,提出一种基于影像参数法的LC带通滤波器的设计方法,即将定K式滤波器和m式滤波器进行优化组合实现带通滤波器,并利用Multisim软件进行仿真,直观地观察设计的LC带通滤波器的性能。该方法在实际应用中取得了良好的效果,对宽带带通滤波器的设计有着重要意义。     

Funding public computing centers: Balancing broadband availability and expected demand

The National Broadband Plan (NBP) recently announced by the Federal Communication Commission visualizes a significantly enhanced commitment to public computing centers (PCCs) as an element of the Commission's plans for promoting broadband availability. In parallel, the National Telecommunications and Information Administration (NTIA) has channelized part of the Broadband Technology Opportunities Program (BTOP) funding to PCCs. However, BTOP funding was the result of an unprecedented economic crisis, and is unlikely to be repeated. Future programs will need to evolve criteria for selecting projects for funding that maximize their cost-effectiveness. We argue in this paper that basing funding for PCCs on broadband availability (or non-availability), is not as cost-effective as considering a broader array of factors related to demand for internet access at public computer centers. We use data on public libraries from the National Center of Educational Statistics to identify factors predicting high demand for internet access at PCCs. Based on this analysis, we argue that low demand markets may benefit more from consumer outreach and digital literacy programs, than from infrastructure deployment. Also, we argue that markets with high availability, should receive more funding if there is high demand as well, as predicted by our model.     

环形组网配置实验研究

结合学校现代通信实验中心现状,把华为MA5300宽带接入设备和SDH光传输实验平台互联起来,组成一个完整的光纤通信实验系统。进一步研究了SDH光传输设备的环形组网,给出了用T2000网管软件配置光传输设备的过程。使实验室的设备得到充分利用,为学校光纤通信实验的改进做了有益的研究与探讨,学生受益,光纤通信实验取得较佳的教学效果。     

网站流媒体技术产品的选择与应用

网站的发展已进入视频时代,而网站所依托的视频技术则处于"战国纷争"时代。探讨了目前视频网站建设的主流技术(产品)及其应用感受。     

流媒体技术在远程教育中的应用

在远程教学过程中,最基本的要求是将信息从教师端传递到远程的学生端,需要传送的信息可能是多元化的,如视频、文本、图片等。就目前来讲,能够在互联网上进行多媒体交互教学的技术多为流媒体,除去实时教学以外,使用流媒体中的VOD(视频点播)技术,更可以达到因材施教、交互式学习的目的     

宽频带脉冲光束非线性"热像"效应理论研究

通过理论分析和数值模拟方法,研究了高功率宽频带皮秒级(亚皮秒量级)脉冲激光非线性"热像"效应。根据宽频带光脉冲包络演化的非线性傍轴方程,在远场近似及光学薄近似条件下,得出了高功率宽频带激光非线性"热像"出现的位置及强度满足的解析关系。结果表明,"热像"形成在非线性介质后与衍射物对称的位置,"热像"强度随脉冲时间发生变化,最大强度通常发生在脉冲峰值功率时刻。通过计算机模拟,并与理论预测结果进行比较,显示两者符合较好。同时对宽频带"热像"的形成过程给出了解释,指出宽频带脉冲光束"热像"的形成类似于时间分片的连续单色光"热像"形成过程。     

宽带网:网络时代科技新宠

网速无极限，本文介绍了宽带网络的接入方式、实际应用和未来的发展前景。     

基于移动宽带网的手把手远程教学模式实验研究

为探索基于移动宽带网的手把手远程教学,创设了实验环境,以远程指导电脑故障排除为实例,进行了72次实验室教学实验。实验分析结果表明,在考虑设备差异的影响后,远程手把手指导效果评分均在70分以上,是有效的,但比当面指导得分低10分以上。对于现象类似、解决步骤单一固定的教学内容,教学资料辅助远程教学法效果最好。对于更复杂的教学内容,答疑式教学法更有效。研究还发现传统手把手指导中最好的方法在远程中未必最好。     

Back to the Future: How Transportation Deregulatory Policies Foreshadow Evolution of Communications Policies

The legal regulatory regimes for communication technologies evolve with technological, economic, and social change. This article asserts that, in the United States, the evolution of the legal regulatory regimes for the communications sector is following a trajectory breathtakingly similar to that already traversed by the transportation sector. As both sectors provide infrastructures essential to the nation and share similar economic attributes of networks, technological evolution within each has generated many of the same core issues. By recognizing this historical reality, we can tap valuable experience in transportation policy to better inform prospective policy change in communications. In this way, future communications policy need not be radical—whether intentionally or unintentionally—nor totally untested, thereby enhancing its potential for sustainability.