移动流媒体业务质量评估及监测方案探讨

文章针对在移动流媒体业务运维中存在的各种难点,深入分析网络现状和业务特性,提出了基于用户体验的质量评价体系,探讨了全程全网的数据采集和分析方案,设计了自动化的业务监测评估工具,为实现对端到端3G数据业务的智能管控和优化做出了有益尝试。     

电信运营商媒体业务发展研究

随着三网融合的推进,如何经营媒体业务成为电信运营商重点关注的问题之一。文章从繁荣泛媒体产业生态的视角,分析电信运营商发展媒体业务的定位,结合电信运营商的业务特点,给出电信运营商发展媒体业务的建议,并分析电信运营商媒体业务的赢利模式。     

探析移动互联网生态系统中运营商的发展策略

从移动互联网的本质出发,在探讨当前移动互联网生态系统的基础上,进一步分析了运营商的优劣势,并提出了相关发展策略建议。     

为便携式装置提供AM/FM收音机功能

便携式装置已成为半导体产业主要的需求来源之一。这些产品的庞大销售量带动半导体技术大幅创新，不仅把各种新功能整合到很小的体积中，还要将耗电量减到最少。便携式装置的新趋势之一，是同时提供音乐播放以及数据和语音传输功能。尽管数字媒体正日益流行，调频与调幅收音机的需求和受欢迎程度也不可忽略。半导体供货商的挑战是在很小的空间中，以低成本提供这些流行功能。     

Multiple-scattering effects on infrared scattering measurements used to characterize droplet size and volume fraction distributions in diesel sprays

We quantify the maximum error due to multiple-scattering effects for an infrared scattering droplet izing technique. Errors in Sauter mean diameters (SMDs) and liquid volume fractions were estimated lased on experimentally determined polarization properties of the scattered light. Light that is multiply scattered from spherical particles becomes randomly polarized, whereas singly scattered light from a spherical particle contains no cross-polarization scattering component. Therefore measurement of the cross-polarization component (in this case parallel) of the scattering signal is a measure of the multiply scattered light. A ratio of parallel to perpendicular polarized scattered light was experimentally determined and used to calculate an error due to multiple scattering. The infrared scattering measurements and polarization measurements used to quantify the multiple-scattering errors were applied to a typical diesel spray that was injected into three different background conditions: a room ambient condition; a room-temperature, high-pressure condition; and a combusting condition. Droplet SMD, liquid volume fraction, and multiple-scattering errors were determined for a number of locations within the spray; results indicate that the combusting case is negligibly affected by multiple scattering. However, the room ambient case exhibited notable errors due to multiple scattering near the centerline of the spray, and the high-pressure case demonstrated susceptibility to multiple scattering throughout all regions investigated. It is important to note, however, that multiple-scattering errors in many cases translate into relatively small effects on the reported droplet sizes.     

基于H.323的视讯会议系统的发展和测试情况

简要介绍了IP网络基于H.323的视讯会议系统的发展状况、相应标准的研究进展和主要设备的测试情况,并根据国内视讯业务发展和实际测试中的情况,对视讯会议设备本身需要面对的一些问题进行了探讨。