The Content Driven Mobile Internet

The development of future mobile networks will be driven, in large part, by content and web based services. In this paper, we examine several performance, scalability and architectural challenges faced by future mobile web applications and how advanced mobile content delivery techniques can address these challenges. We review existing content delivery using a taxonomy that consists of three categories: network scaling, end system acceleration, and content and protocol optimization. While wireline content delivery focuses on network and server scalability, mobile content delivery will likely benefit most from optimizing radio link usage. We also present our ongoing work in this area, which extends the functionality of edge caching to the terminal, uses user interest correlation information to maintain low terminal power consumption and adds a new dimension to radio resource management. This revised version was published online in August 2006 with corrections to the Cover Date.     

iMobile EE – An Enterprise Mobile Service Platform

iMobile is an enterprise mobile service platform that allows resource-limited mobile devices to communicate with each other and to securely access corporate contents and services. The original iMobile architecture consists of devlets that provide protocol interfaces to different mobile devices and infolets that access and transcode information based on device profiles. iMobile Enterprise Edition (iMobile EE) is a redesign of the original iMobile architecture to address the security, scalability, and availability requirements of a large enterprise such as AT&T. iMobile EE incorporates gateways that interact with corporate authentication services, replicated iMobile servers with backend connections to corporate services, a reliable message queue that connects iMobile gateways and servers, and a comprehensive service profile database that governs operations of the mobile service platform. The iMobile EE architecture was also extended to provide personalized multimedia services, allowing mobile users to remotely control, record, and request video contents. iMobile EE aims to provide a scalable, secure, and modular software platform that makes enterprise services easily accessible to a growing list of mobile devices roaming among various wireless networks.     

An architecture for digital hate content reduction with mobile edge computing

Mobile devices with social media applications are the prevalent user equipment to generate and consume digital hate content. The objective of this paper is to propose a mobile edge computing architecture for regulating and reducing hate content at the user's level. In this regard, the profiling of hate content is obtained from the results of multiple studies by quantitative and qualitative analyses. Profiling resulted in different categories of hate content caused by gender, religion, race, and disability. Based on this information, an architectural framework is developed to regulate and reduce hate content at the user's level in the mobile computing environment. The proposed architecture will be a novel idea to reduce hate content generation and its impact.     

分布式电源并网对配电网电能质量的影响研究

分布式电源在配电网的并网规模越来越大,但分布式电源出力具有典型的随机特征和不确定性,分布式电源的并网会对配电网电能质量带来很大的影响。基于分布式电源的输出功率特性,文中分析了分布式电源并网对配电网电能质量影响的原理,并建立了含分布式电源的配电网电能质量的仿真计算模型,对分布式电源在不同并网容量和不同并网位置下的配电网电压偏差、电压波动和电压谐波含量进行了仿真分析,获得了分布式电源并网对配电网电能质量的影响规律。文中研究成果可为分布式电源的并网及配电网电能质量的提高,提供有效的理论参考和技术指导。     

IPTV及相关技术

IPTV是基于IP协议的新一代技术,介绍了IPTV的主要业务功能和系统组成,并阐述了IPTV系统的关键技术。     

不同结构CMOS运算放大器电路的电离辐射效应

介绍了在相同工艺条件下 ,N沟和 P沟输入两种不同结构 CMOS运算放大器电路的电离辐照响应规律及各子电路对电特性的影响情况 .结果表明 :由辐照感生的氧化物电荷引起的N沟镜像负载的不对称是导致 P沟输入运放电特性衰降的主要机制 ;而由氧化物电荷和界面态引起的 N沟差分对的漏电增大则是造成 N沟输入运放电路性能变差的主要原因     

纳米级铝包覆光波导耦合特性研究

为了研究10nm级铝包覆光波导特征参量对其耦合情况的影响,理论模拟了不同金属层折射率和厚度、不同导波层折射率和厚度情况下的衰减全反射谱,分析了特征参量对耦合情况的影响。通过实验验证了金属层折射率和厚度对其耦合情况的影响,发现纳米级铝膜的复介电常数发生了很大的变化。结果表明,导波层厚度影响激发导模的数目,但对耦合深度影响不大;导波层折射率同时影响激发导模的数目和耦合深度;耦合层金属膜厚度不影响激发导模的模数,但对耦合深度的影响很大;对于相同的耦合层金属膜厚度,金属折射率不同,耦合情况大不相同。研究结果为基于双面金属包覆光波导的脉冲展宽器的制作和设计过程提供了参考。     

基于FID的机动车尾气THC测量模块设计与对比实验

机动车排放的总碳氢化合物（total hydrocarbons, THC）是造成雾霾、光化学烟雾的重要原因,在城市大气污染的调查和影响人类健康的研究中,THC是必须的监测目标之一。着重开展了基于氢火焰离子化检测（hydrogen flame ionization detector, FID）的机动车尾气THC测量系统的设计和对比实验。主要介绍了FID测量THC的工作原理,根据FID的测量原理设计了机动车尾气THC测量模块。并根据离子化信号检测需求设计了微电流放大电路,满足大范围、高精度微电流信号检测的要求,获得了检测器对THC的响应峰信号。还对测量得到的THC色谱峰信号进行定性和定量的分析,通过标准曲线法计算了THC的浓度。最后结合美国的SENSORS-FID THC分析仪开展了对比实验,结果表明研发的THC测量模块检测的浓度偏高,测量偏差约为4.44%~8.43%,判断此系统误差主要为O2峰干扰。     

一种基于多相滤波的宽带数字信道化改进算法

对基于多相滤波技术的实信号结构模型及其优缺点进行了分析,针对存在盲区的问题 ,采用降低抽取率的方法对原多相滤波算法进行了改进,建立了无盲区信道化接收机模型。 分别对两种结构模型进行了仿真实验,实验结果验证了改进算法及其模型的可行性和有效性 。利用该改进算法可实现对信号的全概率截获。     

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.