基于BSP算法和模板缓存的阴影实现方法

阴影的生成在体现虚拟现实环境的真实感程度方面起着重要的作用。随着支持模板缓存的3D加速图形卡在个人计算机市场上的普及，使得用采用模板缓存的影域多边形算法来实现实时动态阴影成为可能。综合BSP算法以及OpcnGL中的模板缓存，提出了一种实时生成三维阴影的算法。     

Striping and Scheduling for Large Scale Multimedia Servers

When designing a multimedia server, several things must be decided: which scheduling scheme to adopt, how to allocate multimedia objects on storage devices, and the round length with which the streams will be serviced. Several problems in the designing of large-scale multimedia servers are addressed, with the following contributions: (1) a striping scheme is proposed that minimizes the number of seeks and hence maximizes the performance; (2) a simple and efficient mechanism is presented to find the optimal striping unit size as well as the optimal round length, which exploits both the characteristics of VBR streams and the situation of resources in the system; and (3) the characteristics and resource requirements of several scheduling schemes are investigated in order to obtain a clear indication as to which scheme shows the best performance in realtime multimedia servicing. Based on our analysis and experimental results, the CSCAN scheme outperforms the other schemes. It is believed that the results ar     

中间件Tuxedo在MES应用中数据传输的研究

简要介绍了流程工业MES体系结构和Tuxedo数据传输的类型,并对Tuxedo的FML缓冲格式进行了研究。根据MES业务的要求,用面 向对象的方法及相关技术,将Tuxedo的数据存取、传输和Service调用进行了封装,完成了ATMI类的实现,并在项目中成功地应用。     

The Influence of Nitrogen and Boron Implant into Silicon Substrate on the Phase and Internal Stress of c-BN Films

Cubic boron nitride(c-BN) film was deposited on a Si (100) substrate by the RF-magnetron sputtering.The mainly problems for fabrication of c-BN films are the low purity and high intrinsic compressive stress. In order to solve the two problems, the c-BN film with the buffer interlayer was deposited on the substrate which had been implanted with nitrogen and/or boron ions. The results show: the implantation of nitrogen ions can obviously increase c-BN content and reduce the internal stress slightly; while the implantation of boron shows no obvious improvement to the content of c-BN, which can reduce the internal stress in the film obviously. In addition, it is suggested that the implantation of nitrogen and boron shows the best result, which not only can increase the content of c-BN, but also reduce the internal stress in the c-BN film obviously.     

Fabrication of NiO Buffer Layer for YBCO Coated Conductors by Combining Sputtering and SOE Method

In research of YBCO coated conductors, the development of a oxide template for epitaxial growth of YBCO is very important. Matsumoto et al have demonstrated the potential of the surface oxidation epitaxial (SOE) route for formation a cube textured NiO layer on nickel tapes. The epitaxial NiO functions as a buffer layer of chemical reaction between YBCO and nickel, and as a template for the epitaxial growth of YBCO. However, the surface quality of NiO is difficult to control and defects such as crack, spall and deep grooves exist in SOE NiO layer. A new approach combining sputtering and SOE method to obtain crack-free and cube textured NiO layer were reported. Ni tapes prepared by the combination of rolling and recrystallization were used for this work. A coating of Ni was first deposited on the tapes via magnetron sputtering. Then on the coating tapes, continuous and textured NiO layer were achieved by SOE technology.     

生产线缓冲区容量优化配置:案例研究

生产线缓冲区容量的配置是影响系统性能指标的重要因素之一。这里采用具有阻塞的开排队网络模型研究生产线缓冲区容量的优化配置问题,编制了该模型的一种近似解法——分解算法的应用程序以及仿真程序,并结合工厂的生产实例,探讨了该生产线缓冲区的分配方案,对提高生产效益有一定的指导意义。     

GIS线状缓冲区生成算法研究

缓冲区分析是地理信息系统重要的空间分析功能之一．地理信息系统中的缓冲区生成分点、线、面3种,线状目标缓冲区的生成是点、线、面3种基本空间要素缓冲区生成的关键和基础,文中就线状目标缓冲区的两种生成算法进行了严密的数学推导,并通过编程实现取得了较好的效果．     

PCI运动控制卡的访问方法

利用PCI总线协议和双向FIFO缓冲器,开发一种高速运动控制卡,实现处理机与控制卡之间高速双向并行通信,介绍了其硬件结构,讨论了利用Windriver时PCI卡的访问方法。     

支持VCR功能的扩展流合并算法VCRSM的设计与实现

多播传输作为视频点播服务的一个有效方法在近十年来被广泛研完,许多算法都相对成熟。但由于VCR操作会使多播调度的复杂度增加,性能降低,因此对支持用户VCR操作的多播调度算法的研究很少。针对该问题,本文提出了一个支持VCR功能的零时延流合并调度算法VCRSM。VCRSM通过在客户端使用主动缓存技术满足部分VCR操作,并在服务器端对普通流合并算法进行扩展,使之能响应VCR请求流,并通过延迟请求提高流的共享度,优化服务器的性能。模拟实验证实,VCRSM能在不占用更多带宽的情况下,零延迟地满足用户的各种VCR操作。     

弹性分组环业务队长的分析

弹性分组环(ResilientPacketRing,RPR)是刚被IEEE802.17标准化,主要用于城域网的新型MAC层协议,也是宽带IP光城域网技术的重要发展方向。RPR在结构上从属寄存器插入环,其缓存大小的设置对性能的影响很大。目前RPR缓存大小的设置主要借鉴Ethernet、ATM等其它网络的实际应用时经验或仿真结果,尚缺乏理论方面的研究。基于排队论,该文对RPR各缓存里业务的队长及其和吞吐量、节点数目的关系进行研究。所得结果和IEEE802.17所推荐的数值相近;同时还得到一个结论并值得关注:和目前RPR资料文献里的结论不同,理论推导结果表明,队长基本都不是随节点数目成线性关系的。