永嘉应急广播系统建设方案简介

农村应急广播体系建设被列入浙江省政府2014年为民实事,以永嘉县的应急广播系统平台为例,简单介绍该系统的基本功能和实现原理,详细介绍搭建应急广播系统的技术方案。     

电视剧缩编网络的研究与设计

介绍了电视剧缩编网络的需求与功能,分析了系统的主要业务流程,构建一个面向电视台全台网的电视剧缩编网络,实现了电视剧入库、上载、检索、编辑、播出、存档一体化管理等功能。     

数字高清晰度电视地面广播传输

本文简要讨论了美国ＦＣＣ提出的对ＨＤＴＶ地面广播传输的基本要求，概述了美国与欧洲的几套ＨＤＴＶ传输方案的特点，论述了地面广播信道的特性。文中着重介绍基于ＶＳＢ的ＧＡ方案和采用ＣＯＦＤＭ的传输方案，并介绍了纠错编码、调制、均衡的新理论和新技术在ＨＤＴＶ地面广播传输中应用。     

An Adaptive Generalized Transmission Protocol for Ad Hoc Networks

Wireless networking and group communication in combination allows groups of dispersed mobile users to collaborate. This paper presents AGENT, a medium access control (MAC) protocol that unifies point-to-point and multi-point transmission services to facilitate group communication in ad hoc networks. Analysis and experiments performed in a simulated ad hoc network demonstrate that AGENT exhibits reliable and stable performance with high spatial bandwidth reuse. Moreover, variation in the proportion of point-to-point and multi-point traffic is shown to have little impact on the overall performance of AGENT. Comparison with the other tested MAC protocols reveals that the performance of AGENT is superior, achieving higher channel utilization and lower access delay.     

招远电视台硬盘播出系统实践

介绍硬盘播出系统的特点及系统的设计、构成、工作方式，由于采用了许多关键技术，系统具备先进性、合理性、实用性、可靠性。     

市(地)级广播电视行政执法方法与程序

广播电视行政执法是指广播电视行政部门及其行政执法人员依据行业内法规和规章，对违反广播电视法规和规章、利用广播电视设施进行非法宣传及破坏广播电视设施的行为主体依法加强管理的行政行为。对市(地)级广播电视部门行政执法的组织和实施方式、正常程序及行政复议过程中的方法程序与注意事项进行了分析与说明。     

智能化建筑的广播音响系统原理及系统集成设计

本根据相关的火灾自动报警系统设计规范，就智能化建筑的广播音响系统的设计及其工作原理、如何集成背景音乐和紧急广播这两个系统，提出了一种方案，以供探讨。     

A Broadcast Mechanism Supporting Power-Conserving Mobile Stations<Superscript>*</Superscript>

Power saving is an important issue in the mobile computing environment. In this paper, we propose a broadcast mechanism which constructs the broadcast channels according to the access frequency of each disseminated kind of message in order to save power in mobile stations. The pinwheel scheduling algorithm presented in this paper is used to organize all kinds of messages in the broadcast channels in a most symmetrical distribution for reducing both tuning time and access time. Performance of the proposed mechanism is analyzed and the improvement is demonstrated with numerical results. The results show that the proposed mechanism is capable improving both tuning time and access time as the skew access characteristic exists among the disseminated messages. ^*This work was supported in part by the National Science of Council, R.O.C., under Contract NSC94-2213-E-130-003.     

A Public-Key Traitor Tracing Scheme with Revocation Using Dynamic Shares

We proposed a new public-key traitor tracing scheme with revocation capability using dynamic shares and entity revocation techniques. Our schemes traitor tracing and revocation programs cohere tightly. The size of the enabling block of our scheme is independent of the number of receivers. Each receiver holds one decryption key only. The distinct feature of our scheme is that when traitors are found, we can revoke their private keys (up to some threshold z) without updating the private keys of other receivers. In particular, no revocation messages are broadcast and all receivers do nothing. Previously proposed revocation schemes need update existing keys and entail large amount of broadcast messages. Our traitor tracing algorithm works in a black-box way. It is conceptually simple and fully k-resilient, that is, it can find all traitors if the number of them is k or less. The encryption algorithm of our scheme is semantically secure assuming that the decisional Diffie-Hellman problem is hard.AMS Classification: 11T71, 68P30     

Aspects of multistation quantum information broadcasting

We study quantum information transmission over multiparty quantum channel. In particular, we show an equivalence of different capacity notions and provide a multiletter characterization of a capacity region for a general quantum channel with k senders and m receivers. We point out natural generalizations to the case of two-way classical communication capacity.