基于XML同步媒体技术在远程教育中的应用

远程教育的授课内容点播应用不仅涉及流式媒体技术,还涉及同步媒体技术,需要解决视频/音频与讲稿的同步播放问题。该文研究同步媒体技术在远程教育中的实现,阐述了基于标准化技术规范进行教育资源描述的必要性,分析了同步媒体集成语言SMIL,提出了基于XML的同步媒体解决方案,设计和实现了基于XML同步媒体技术的授课内容点播系统。     

集成多媒体文件系统的建模与实现

视频、音频等连续媒体与文本有着不同的特性，对文件系统提出了不同的要求。该文提出了一个集成多种媒体数据类型的层次文件系统模型，在不同层次上根据媒体的实时性、周期性等特点进行优化资源分配，提供资源利用率和服务质量。通过建立原型系统对该模型进行了验证。     

分布式异构网络化系统的集成方法探讨和实践

本文以广电行业内数字化网络化为大背景,分析了电视台内分布式异构网络化系统的集成要求,提出了以媒体集成总线为核心的解决方案,通过WebService和消息列队相结合的信息传递和FTP中心缓存的方式,实现多个分布式异构网络化系统的集成,并提出需制定的相关互联标准,为国内各电视台的互联互通问题提供可参考的解决方案.     

一种支持海量跨媒体检索的集成索引结构

提出一种支持海量跨媒体检索的集成索引结构.该方法首先通过对网页的预处理,分析其中不同模态媒体对象之间的链接关系,生成交叉参照图.然后通过用户相关反馈进行调节.当用户提交一个查询对象时,首先对交叉参照图进行基于索引的快速定位,得到与查询对象相关的候选媒体对象.然后对得到的候选媒体对象进行距离运算,得到结果媒体对象.理论分析和实验表明,该方法较顺序检索具有更好的性能,非常适合海量跨媒体数据检索.     

政务网站新媒体发布集成环境建设探讨

根据政务网站在各个媒体上信息发布的特点,提出一种集成各种媒体内容管理功能的综合内容管理解决方案,采用统一的信息资源池集中管理各种数据资源,实现信息的多渠道汇聚和一站式发布,形成新媒体平台间内容关联与分享的环境.     

一种基于DLNA协议的Android设备多媒体共享方案

针对数字家庭的未来生活场景,提出基于Android平台的多媒体共享系统设计。在DLNA的协议框架内设计,结合Android设备的特点,系统把媒体服务器、控制器与渲染器集成起来,提出一种媒体服务器的优化方案,使得家庭网络中的数据传输更为稳定。使用该系统可以方便地在家庭网络中共享多媒体资源。     

多媒体数据库引擎及其体系结构研究

多媒体数据库引擎将媒体内容处理方法与媒体数据检索方法整和为一体,以引擎的方式与关系数据库管理系统或多媒体应用系统集成起来,从而简化多媒体应用开发的复杂度。该文介绍了多媒体数据库引擎的体系结构、与关系数据库管理系统无缝结合的方法以及多媒体数据库引擎中的DataTool模块。     

流式媒体集成课件的实现

本文简要介绍流式媒体集成技术,给出使用SMIL语言开发多种流式媒体集成网上课件的完整过程和实例分析,读得可在作者的web上浏览本文实例的运行效果。     

使用Java-COM桥实现RealMedia控制

在Java环境中使用Java-COM桥实现对JMF不支持的媒体文件的控制及一般COM控件的集成;特别地,在GUI环境下实现RealMedia媒体的播放.该接口方法简洁易用,可作为Java应用程序集成COM的通用方式,并可实现COM组件的可视化.     

SMIL及其流媒体集成的关键技术

本文介绍了同步集成多媒体语言SMIL的基本概念及其在流媒体集成时实现媒体组合、规划时间线和设置播放布局等几个关键技术,指出了实现这些技术的有关问题和策略,并给出了有关实例,实现了媒体播放的连续平滑和良好的视觉效果.     

高速视频记录应用的一种解决方案

在PC平台上进行高速数据记录,由于受局部总线速度和文件系统的影响,速度很难超过每秒20M字节。我们设计了一种新的方案,总线采用时钟频率为66MHz,数据位宽为64bits的PCI总线,提高了总线速度。采用Adaptec公司的ASPI指令直接控制SCSI接口卡读写硬盘,摆脱了文件系统对写入速度的影响。记录媒质是由两块SCSI硬盘组成的RAID0级阵列,提高存储媒体的物理写入速度。实验结果证明,存储速度得到很大提高,稳定速度达到每秒100M字节以上。     

基于CAN总线磁悬浮球系统分布式控制设计与实现

选用国际上应用最广泛的现场总线之一—CAN总线,对磁悬浮球控制系统进行分布式控制,设计并实现了CAN总线磁悬浮球控制系统。首先,对磁悬浮球控制系统进行了详细分析,确定了系统的总线型网络拓扑结构。在该网络结构下,进行软硬件设计。硬件设计工作主要是设计一个通用CAN节点的设计,使其能够完成模拟量的精确快速采样、高精度输出以及开关量的控制三大功能。软件设计包括两部分:CAN节点中基于ARM的软件设计和PC端监控软件的设计。     

基于VPX总线的抗恶劣环境计算机

随着FC,PCI-Express,RapidIO,Hypextransport等高速串行总线的快速发展,I/O模块对计算机的内部总线速度要求不断提高,高性能和高可靠性成为抗恶劣环境计算机设计中的一对矛盾.该文提出一种采用VPX总线的抗恶劣环境计算机设计方案,为高性能、高可靠性计算机的实现提供了技术途径.     

Intercity Bus Scheduling Model Incorporating Variable Market Share

In this paper, we develop an intercity bus scheduling model for a variable market share. The proposed model, unlike the past intercity bus scheduling models, does not assume a fixed market share. Instead, passenger choice behaviors in competitive markets are considered. The model is formulated as a nonlinear mixed integer program that is characterized as nondeterministic polynomial-time hard. We develop a solution algorithm to efficiently solve the model. The test results, which are based on a major Taiwan intercity bus carrier, show the good performance of the model and the solution algorithm.     

CAN总线与以太网互联网关的设计

电梯远程监控系统的关键在于电梯CAN总线与以太网的互联,基于此背景提出一种高性能低成本的解决方案。首先,给出系统总体结构和硬件设计,然后详细阐述软件设计,完成基于μC/OS-II操作系统的嵌入式uIP协议栈的移植开发,并提供软件系统的具体优化方法。最终实现以LPC2368为微处理器和DP83848C以太网控制芯片为核心的CAN总线与以太网互联网关,为工业现场总线与以太网的互联提供了一种可行的解决方案。     

基于SPI协议的MMC卡读写机制的实现

多媒体卡 (MMC)是在多媒体领域被应用很广的外部存储介质 ,可是大多数微处理器 (MCU)并没有专门的多媒体卡控制器。串行外设接口 (SPI)协议是被广泛支持的总线协议 ,仅需四根线就可以完全解决读写的问题。多媒体卡的串行外设模式给了不具有多媒体卡控制器而需要读写多媒体卡的微处理器另一种选择 ,它通过串行外设接口总线与多媒体卡相连 ,并支持多媒体卡模式下的大多是指令。该文介绍了串行外设接口协议的原理和多媒体卡的串行外设接口协议模式的特殊性 ,最后通过DPS5 685 8平台实现。虽然在速度上比用多媒体卡控制器实现略慢 ,可是已经完全能够满足大多数的应用场合。     

基于RIA和软PLC的现场总线监控系统的设计

随着技术的发展,原先互不相干的互联网和现场总线,得以相互延伸与整合,大大丰富了工业控制的手段。在原先由软PLC与现场总线技术构建的Web监控系统中,再集成应用RIA技术,使得这种基于RIA架构的Web远程监控,既实现了现场总线网络内网与Internet外网之间的信息交换,又利用RIA和多层结构提高了系统的性能,改善了用户体验,形成了一种有效的工业控制与管理信息化的集成解决方案。     

Combined bus and driver scheduling

The daily bus and driver scheduling, for all bus companies that operate a non-fixed daily schedule of legs, is a difficult combinatorial problem that must be solved every afternoon. The work of the next day is changing on a daily basis either due to different load requirements on the standard routes or due to additional services and trips that the busses need to perform and the bus companies do wait until late afternoon before solving the scheduling problem. In addition, there exist hard customer requirements on the time required for the solution of the problem. This paper firstly presents a quick heuristic scheduling procedure named QS for the solution of the problem. QS has worked very well in the production environment of several bus companies of Greece. The main algorithms used by QS are minimum cost matching, set partitioning and shortest path. In addition, a column generation procedure named CGQS that uses an LP-solver and the QS process as its integer solution finder is presented. CGQS starts from the solution point of a single QS run and then performs several iterations in which LP problems are solved and new promising shifts are created using the LP dual solution.Scope and purposeA typical bus company of Greece is a cooperative operation with a state license to exclusively serve a particular geographical area. There are from about 50 buses in the bus companies of the smaller areas to more than 200 buses in the companies of the larger and busier areas. The bus and the driver operate together as a unit and must be scheduled daily in such a way as to fully cover the transportation load of the following day in an economical and satisfactory manner. The transportation load is a set of trip segments that have specific departure and arrival time and location and can be covered only with a pre-specified set of bus types. Although the scheduling is done daily the exact location of every bus at the end of the previous day and its earliest availability time must be also respected. The solution process creates in a combined manner a set of shifts that cover all the trip segments of the next day as well as assigning these shifts to all the available busses. This gives to our approach an advantage over other techniques that firstly solve the shift creation problem and then attempt to assign the busses to the shifts. Even an optimal set of shifts is not useful if indeed a feasible assignment to the available busses is not possible for the particular day. This problem is NP-complete and an optimal solution for the problem using a complete enumeration approach cannot be found for the problem sizes we are considering. In addition, the bus companies require low solution times due to their desire and need to wait until late afternoon for all possible additional chartered trip segments of the next day to be reserved.     

Heuristic approach for solving employee bus routes in a large-scale industrial factory

This paper compares different methods for solving a location-routing problem (LRP), using real-world data from the bus transport service for employees of a large-scale industrial factory in Thailand. We tested four AI (artificial intelligence) techniques Maximin, K-means, Fuzzy C-means, and Competitive Learning and two hybrids of these four K-means with Competitive Learning and K-means with Maximin to allocate the bus stops. The efficiency of the algorithms was compared, in terms of the quality of the solutions. The K-means with Maximin provided the best solution, as it minimized number of bus stop locations and employees’ total traveling distance while satisfied employee at maximum radius 1.73 km, compared to K-means with Competitive Learning, as the same number of bus stop it provided higher total traveling distance and maximum radius. The other non-hybrid techniques provided higher number of bus stop locations.We then used ant colony optimization (ACO) to determine the optimal routing between the 300–700 bus stops as allocated by K-means with Maximin. The optimal bus routing to transport the factory’s 5000 plus employees required 134 buses (134 independent routes) covering 500 bus stops and traveling nearly 5000 km. While optimal, this routing was costly and created monitoring difficulties. To address these concerns, we constrained the number of bus routes; while this dramatically increased the total distance, it provided a more practical solution for the factory.     

基于MCF5272微处理器的PC104总线的设计与实现

MCF5272是一款高性能的嵌入式微处理器,PCI04是一种专门为嵌入式控制而定义的工业控制总线。简要介绍了MCF5272及PC104总线的特点、信号,提出了为MCF5272微处理器实现PC104总线接口的设计要点及实现方案。