媒体资产管理系统编目工作站设置

本文阐述了媒资管理系统编目工作站的安装和设置.在编目过程中如出现故障,可依照本文进行媒资编目工作站的重新设置,从而保证媒资管理系统的正常运行.     

数字音频工作站和广播节目自动播出系统

介绍最新发展的数字音频工作站和广播节目自动播出系统。     

机群系统结构及其设计因素

机群并行计算机成为并行计算研究的热点。文中介绍了机群并行系统的特征、机群的体系结构、理想模型,并讨论了在设计机群并行系统时需要考虑的基本因素。     

数字音频工作站及其特点

本文通过数字音频工作站的两种基本工作方式,介绍了一些常见的音频工作站及其它们的工作特点,并对数字音频工作站的发展作了展望。     

音频工作站自动备份软件的开发与使用

本文根据我台近几年音频工作站系统的工作实践,结合实际使用中存在的问题（无备份软件）,自主开发出适合本台使用的播出站备份软件,希望能借此推动音频工作站的广泛利用。     

北京人民广播电台数字音频工作站及自动播出网络系统建设情况

本文简要介绍了北京人民广播电台在建设数字音频制作播出网络系统中的一些情况，探讨了关于数字化的一些技术问题。     

可重构网络的可用性模型

针对网络故障恢复机制可以对可重构网络性能产生重要影响的实际情况,从理论上对可重构网络的运行状态进行分析,提出了一种可重构网络的可用性模型。该模型以节点服务能力和网络服务能力的量化描述为基础,通过引入可重构网络的状态转移理论,以有限状态马尔科夫链进行理论分析得到。通过仿真实验对该可用性模型的有效性进行验证,仿真结果表明,理论模型计算结果与仿真结果拟合性较好,可用于描述特定可重构网络的可用性能。     

简议光工作站

本文从工程实际出发,论述了光工作站的适用范围,同时提出了一种简易光工作站的需求。     

FPGA动态重构技术在算术逻辑单元中的应用

基于Virtex2-Pro ML310开发环境,使用基于模块(Module-based)的部分动态可重构方式,实现了动态重构技术在算术逻辑单元中的运用.实验数据结果表明使用普通方法需要下载的文件大小是使用部分动态重构方法的5.82倍,部分动态重构以较小容量的硬件资源,实现了较大的时序系统整体功能,减小了算术逻辑单元的面积,增加了电路的下载速度并且提高了硬件利用率.     

动态可重构技术浅述

动态可重构技术可以利用可重配置硬件的灵活性,使可重配置硬件不同时刻完成不同的功能.分析表明,通过对可重配置硬件的复用进而扩大硬件的等效规模,可以节省硬件资源的面积、输入/输出管脚和系统的功耗等.研究了动态可重构技术包含的内容,讨论了动态可重构系统设计过程中需要考虑的问题并描述了其发展趋势.     

Development of a Run-Time Reconfiguration System with Low Reconfiguration Overhead

The concept of using a microcontroller coupled to re-programmable FPGAs is being used at the heart of Run-Time Reconfigurable (RTR) systems. This paper presents the development of an RTR system for DSP and telecommunication applications. It differs from other systems, in that it treats reconfiguration time as a key design parameter by employing design for reconfiguration where partial reconfiguration is identified in the design of the circuit architecture. Reductions of up to 75% in the implementation time of multiplication, division and square root circuits have been achieved using the Xilinx XC6200 FPGA family. A special hardware/software interface called the Virtual Hardware Handler, has also been developed to support the design approach. It vastly simplifies the reconfiguration operation, reducing it to a simple process of passing pointers and data. The approach has been implemented on a windows-based RTR system.     

Reconfiguration and Dynamic Load Balancing in Broadcast WDM Networks*

In optical WDM networks, an assignment of transceivers to channels implies an allocation of the bandwidth to the various network nodes. Intuition suggests, and our recent study has confirmed, that if the traffic load is not well balanced across the available channels, the result is poor network performance. Hence, the time-varying conditions expected in this type of environment call for mechanisms that periodically adjust the bandwidth allocation to ensure that each channel carries an almost equal share of the corresponding offered load. In this paper we study the problem of dynamic load balancing in broadcast WDM networks by retuning a subset of transceivers in response to changes in the overall traffic pattern. Assuming an existing wavelength assignment and some information regarding the new traffic demands, we present two approaches to obtaining a new wavelength assignment such that (a) the new traffic load is balanced across the channels, and (b) the number of transceivers that need to be retuned is minimized. The latter objective is motivated by the fact that tunable transceivers take a non-negligible amount of time to switch between wavelengths during which parts of the network are unavailable for normal operation. Furthermore, this variation in traffic is expected to take place over larger time scales (i.e., retuning will be a relatively infrequent event), making slowly tunable devices a cost effective solution. Our main contribution is a new approximation algorithm for the load balancing problem that provides for tradeoff selection, using a single parameter, between two conflicting goals, namely, the degree of load balancing and the number of transceivers that need to be retuned. This algorithm leads to a scalable approach to reconfiguring the network since, in addition to providing guarantees in terms of load balancing, the expected number of retunings scales with the number of channels, not the number of nodes in the network.     

通用信号处理模块功能线程动态重构技术

针对综合模块化航空电子（ Integrated Modular Avionics, IMA）系统中通用信号处理模块（ Signal Processing Module, SPM）功能线程动态重构和应用程序在线更新的工程要求,采用特有的应用程序3级加载流程,能够按照系统指令配置DSP和FPGA,可存储和运行数10种数字信号处理功能程序。目前该技术已在一系列航空电子设备中广泛使用,实现了稳定可靠的功能重构和代码更新。     

Reconfiguration of Logical Topologies with Minimum Traffic Disruptions in Reliable WDM-Based Mesh Networks

A wavelength division multiplexing (WDM) network offers a flexible networking infrastructure by assigning the route and wavelength of lightpaths. We can construct an optimal logical topology, by properly setting up the lightpaths. Furthermore, setting up a backup lightpath for each lightpath improves network reliability. When traffic demand changes, a new optimal (or sub-optimal) topology should be obtained by again applying the formulation. Then, we can reconfigure the running topology to the logical topology obtained. However, during this reconfiguration, traffic loss may occur due to the deletion of older lightpaths. In this paper, we consider reconfiguring the logical topology in reliable WDM-based mesh networks, and we propose five procedures that can be used to reconfigure a running lightpath to a new one. Applying the procedures one by one produces a new logical topology. The procedures mainly focus on utilizing free wavelength resources and the resources of backup lightpaths, which are not used usually for transporting traffic. The results of computer simulations indicate that the traffic loss is remarkably reduced in the 14-node network we used as an example.     

面向密集用户区域的无线网络重构体系架构

现有蜂窝移动通信系统支持的业务量相对稳定,不能很好地满足密集用户应急突发业务的需求,在资源综合优化利用方面还存在局限性。无线网络逻辑重构是一种在已有蜂窝系统物理架构上,通过调整或重新配置资源的组织运用方式,以最大限度地提升系统容量的方法。本文首先分析了无线网络重构对于提升蜂窝系统容量的重要性,接着设计了基于SAE的无线网络重构体系架构,在此基础上给出了网络重构的控制方式以及信令实现流程。     

基于System Generator的动态局部可重构设计方法

在动态局部可重构设计过程中,系统级设计到现场可编程门阵列（FPGA）硬件实现,还需要大量的寄存器传输级（RTL）硬件语言编写,导致设计效率下降的问题。针对该问题,以Xilinx公司最新提出的动态局部重构设计流程———早期获取部分可重构（EAPR）为基础,利用System Generator软件,提出一种动态局部重构的设...     

频谱效率优先的任播路由冲突感知的弹性光网络资源重配置

针对混合供电的数据中心互联弹性光网络中,为了降低任播业务传输的阻塞率和能耗,论文提出一种基于频谱效率优先的冲突感知(CSEFR)任播路由资源分配策略。该策略首先计算任播阻塞率优化光路,按频谱效率优先准则对光路重配置排序,用首次命中(FF)方式分配频谱。如果任播的阻塞率优化的光路目的节点是不可再生能源供电数据中心,则预留此阻塞率优化光路,并为任播建立一条连接可再生能源供电数据中心频谱效率次优的能耗优化光路,使用末端命中(LF)频谱分配方式;若该阻塞率优化光路连接的目的节点是可再生能源数据中心,且与其他任播的能耗优化光路频谱分配冲突,将冲突的任播能耗优化光路重配置到其预留的阻塞率优化光路传输以解决光路的频谱冲突问题。仿真结果表明,论文提出的CSEFR策略能在大幅降低网络不可再生能耗的同时,实现阻塞率和能耗折中的路由策略,而且对不同数据中心配置的网络环境具有普适性。     

面向服务的无线电重配置方案设计

分析了基于面向服务体系架构（SOA）的Web服务架构特点,提出了把面向服务的系统设计和集成思想应用到认知无线电系统（CRS）的设计和构建上,将其称之为面向服务的无线电（SOR）。SOR的各功能单元以松耦合服务的方式提供,实现最大程度的移植和重用。通过重新组合不同的服务或改变服务的参数可以灵活地实现SOR系统的重配置。根据这一概念,设计实现了基于SOR的原型系统。