数据流

In this system, we introduces cluster architecture to provide global and scalable streaming caching proxy service mechanism; We implement streaming media transfer protocol on caching proxy end; We implement layered caching mechanism (global disk caching and memory caching) using dynamic sharing running memory buffer algorithm to support more stable and real-time parallel streams; We implement client request aggregation by means of streaming session sharing to reduce disk I/O and serve more user; We propose single streaming image to support the unify of pre-fetching streaming and caching streaming, which guarantees the proxy streaming of transparency for client; We design and implement streaming pre-fetching mechanism based on packet feedback information to reduce the number of "rebuffering" on client end; We bring forward streaming caching admission control policy fit for streaming caching proxy server to guarantee the QoS of streaming service.

该系统引入集群架构以提供全局的、可扩展的缓存代理服务机制；实现了缓存代理端的流媒体传输协议；采用动态共享运行缓冲区算法实现了分层缓存机制(全局磁盘缓存和内存缓存)以支持更多稳定、实时的并发流；利用流会话共享机制实现了客户请求聚集，从而减少磁盘I/O同时能服务更多的客户；提出了单一流映像，以支持预取流和缓存流的统一，从而保证代理端服务流对客户的完全透明；设计并实现了基于包反馈信息的流数据预取机制，从而减少了客户端的"rebuffering"次数；提出了适合于缓存代理服务器的流缓存准入控制策略，保证了流服务的QoS。

According to real-time requirement of stream data and losable characteristic of transportation, the thesis analysis existing stream data signature methods suc h as star-s haped tree-shaped and Golle chain. Considering the condition of limit ed resource of receiver, it proposes forward plac ed hash chain data signature sc h eme based on Gilbert-Elliot Network channel model and enhanc ed Golle chain stream data signature method.

本文针对流式数据实时性要求和传输中易丢包的特点，分析比较了现存的星型、树型、Golle链型等几种典型的流式数据签名方法，考虑到接收方资源有限的情况，基于Gilbert-Elliot网络通道模型，改进了Golle链型流式数据签名方法，提出了一种hash值前置流式数据签名方案。

The regurgitant volume was calculated by temporally integrating the instantaneous flow volume rate of each frame during systole.

建立了基于经食道旋转扫描二维和经胸实时三维超声多普勒血流图像获取方法和图像插值、配准算法获得体数据，经多维重建描述二尖瓣反流速度的空间分布，立体观察返流的时相、方向、反流束长度、面积、体积、空间传播和严重程度等；通过重建反流后的速度场，从血流动力学角度分析了二尖瓣反流的性质，计算偏心反流束的湍流强度，利用反流束角度和湍流强度对计算结果进行修正；基于实时三维彩色多普勒成像技术，利用控制体原理对二尖瓣反流束在反流瓣口横断面的速度分布进行空间与时间积分获得二尖瓣偏心性反流的每搏反流量。

At last, on the basis of the research of XPDL, the paper analyzes and designs renewedly a Workflow Modeling System, and optimizes the sutructure of the system, and change the store method and transmission method of workflow model data,and carries out the mapping from Workflow Process Model to XPDL.In order to reappearance the graphical workflow model,the paper designs a method of storing data to store the datum of graphical workflow model.

最后，在研究XPDL规范的基础上，论文对原型系统重新进行了分析与设计，改进了系统的结构、改变了工作流过程模型数据的存储方式和传输方式，实现了工作流过程模型向XPDL的映射，并设计了以XML文档存储工作流过程模型空间数据的数据存储方式，从而解决了图形化工作流模型难以再现的问题。

Based on the previous results, the method to derive creep constructive model from the indoor experiment data is studied, and these study works are also finished: the reasonable method to determine instance elasto-plastic deformation according to experiment curve, the optimization method to perform curve fitting based on experiment data, the universal method to derive creep constructive model from experiment results.

4在已有研究成果的基础上，对从室内试验数据成果导出流变本构模型的方法进行探讨，研究从室内流变试验曲线上确定瞬时弹塑性变形的合理方法，以及对流变试验数据进行曲线拟合的最优化方法，探讨由室内试验数据成果导出流变本构模型的一般性方法。

Therefore, as one of the most perspective applications, P2P streaming system has become one of the hotspot of P2P research.This paper conducts in-depth research on several basic issues of P2P streaming system, including the design of P2P overlay network, optimizing the topology based on underlay network, managing member nodes, and scheduling dynamic data set between data sending nodes to obtain minimum delay, etc.

本文针对大规模流媒体应用部署中的若干问题对P2P流媒体技术进行了深入的研究，从覆盖网结构、节点管理、数据分发以及异常处理等方面分析比较了几种典型的P2P流媒体系统模型，针对解决当前主流的图状拓扑模型在实现中存在的组播结构不稳定、异构性节点适应性差、数据调度效率低、开销大等问题，提出了一套完整的面向大规模网络视频直播的P2P流媒体系统AVStreamer的设计和实现。

Next, two lingcod registered their presence in the data stream—both males, according to identification records in Reynolds's waterproof notebook.

接下来，两条蛇鳕在数据流中登记了它们的行踪——从雷诺兹的水下记录来看，都是雄性。

In order to improve the precision of super point detection and control measurement resource consumption, this paper proposes a super point detection method based on sampling and data streaming algorithms, and proves that only sources or destinations with a lot of flows can be sampled probabilistically using the SDSD algorithm.

为了提高超点检测的精度并控制测量资源的使用，提出了一种基于抽样和数据流算法的超点检测方法。

LIU Guang-da. Study of the Compatibility of JZJ-400 and ECRM Laser Typesetters on Data Flow.

刘光达。国产与进口激光照排机数据流差异极其兼容化方法研究。

Network link can support the IP data stream of any structure or access methods Billiton.

网络链路可以是支持IP数据流的任何拓结构或访问方法。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。