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At first, in this paper the background and basic principle of VoIP are introduced; the much popular VoIP technology based on H.323 protocol is studied; based on the function and main working process of IP telephone system, the principle of coding of compression and transfer technology of the real-time voice are analyzed; depended on the existed experimental environment, the program of voice part of PC to PC video telephone terminal based on LAN is designed and implemented; and the problems encountered during the design of program have been analyzed and solved.

本文首先介绍了IP电话的发展简史，IP电话技术原理；对目前最为流行的基于H.323协议的VoIP技术进行了研究；根据IP电话系统的功能和主要实现过程，分析实时语音压缩编码技术和传输技术原理；利用实验室现有的实验环境，设计并基本完成了一种基于局域网的PC to PC可视电话语音部分的编程；并对程序设计过程中所遇到的问题进行了分析和解决。

A method for use in a DPC includes: receiving ( 400 ) a control signal based on a desired output signal that identifies a first output tap on the delay line; based on the control signal, selecting ( 410 ) at least two output taps on the delay line for receiving at least two different phase-shifted clock signals; and generating ( 420 ) an output signal based on the control signal and the received phase-shifted clock signals that is substantially the desired output signal.

在DPC内使用的方法包括：基于期望的输出信号接收(400)用于识别该延迟线上的第一输出抽头的控制信号；根据该控制信号，在该延迟线上至少选择(410)两个输出抽头，以至少接收两个不同相移时钟信号；以及根据该控制信号和收到的基本上是期望的输出信号的相移时钟信号，产生(420)输出信号。

The thesis researches the robot navigation problem based on the laser sensor. First of all, a laser fused visual emendation method is designed to raise the precision of the monocular vision. After that, the laser based robot smooth obstacle avoidance, navigation, and movement plan algorithm are designed based on the laser sensor and are simulated on the Player/Stage platform.

本文基于激光传感器研究了几类特殊环境下的导航问题，首先特设计一种融合激光检测的视觉校正算法提高了单目视觉的测量精度，然后分别利用激光传感器设计了机器人平滑避障、导航，以及特殊环境下的运动规划控制算法，并通过Player/Stage仿真平台进行仿真实验。

B Mine the core of consortium based on the Six Degrees of Separation and describe Shortest Path based on LINk wEight algorithm SPLINE（Shortest Path based on LINk wEight）.

b 基于六度分割和最短路径社团核心成员挖掘，讨论了计算节点间的最短路径，根据六度分割定理的剪枝，基于SPLINE算法和中心度挖掘犯罪子团伙中的核心的技术。

Busparallel expansion and pipeline technique are adopted to improve the average inputand output speed of recorder based on FLASH memory. 2 A concept of 'cluster' isintroduced. The using state message of each cluster is loaded in the spare area,following the target datum, to keep the pipeline sequence of multiple clusters' loading, which guarantee the average input speed of system. 3 Based on the using statemessage of every cluster, the Cluster Allocation Table established in memory enablethe system to manage the recorder flexibly in high speed, similar to a file managementsystem. 4 PowerPC 8245 based embedded system, along with Vxworks real-timeoperating system is introduced to make the system more easier to be applied to theprojects in the future.

本文所述的关键技术特点主要包括：采用了并行扩展以及流水线操作技术以提高基于FLASH芯片的存储区平均输入输出能力；引入了&簇&的概念，为了保证连续写入过程中的流水线顺序，系统向存储区加载每一簇有效数据后，紧接着还将向相应簇的空余区中加载该簇的使用状态信息；根据所有簇的使用状态信息在系统内存中建立&簇分配表&，可以支持系统快速灵活地管理存储区，即，类文件化的数据管理；采用基于PowerPC8245的嵌入式计算机硬件系统及基于Vxworks的嵌入式实时操作系统，提高了系统的整体性能及系统研发的延续性。

The main contents of the present paper include: 1、The mechanism of fouling accumulation and the effects of fouling and slagging on boiler performance are analyzed. The model of fouling increasing is developed on the basis of sediment rate and denudation rate. The fouling monitoring models for boiler furnace and convective sections based on heat balance, the ones for air heater based on converted pressure difference are given. The implement results show that these models can reveal the cleanliness of boiler heat transfer surface. 2、The disadvantages of the model for boiler furnace fouling and slagging monitoring based on heat balance are discussed, and the calculation of radiant heat flux is considered as the primary difficulty.

主要包括以下内容： 1、分析了锅炉受热面污染形成的机理，从灰污的沉积率和剥蚀率角度出发，推导了受热面灰污增长的基本模型，分析了灰污热阻随积灰时间和烟气流速变化的规律，并通过大量现场试验，得到了沉积常数与时间常数的取值范围； 2、针对炉膛、对流受热面和空气预热器等不同受热面的传热特性，分别建立了基于热平衡和折算压差的污染在线监测模型，经实践验证，其监测结果能够满足现场工程应用的精度要求； 3、分析了基于热平衡原理的辐射、半辐射污染监测模型的不足之处，指出了机理模型因对炉内辐射换热量计算不准确，导致对以辐射换热为主的炉膛和以半辐射半对流的屏式过热器监测效果不够理想。

In recent years, the town of West street to the party committee and government for the purpose of peasant income, restructuring as the main line, identified four pillars of industry; to mainly high-quality apple fruit industry to axillaris then dried jujube-based industries, to cattle, sheep, chicken-based animal husbandry and aquaculture industries, to rhubarb,huang qin , habitat-based Chinese herbal plant industries, guiding farmers to become fairly well-off.

近年来，西陌镇党委政府以农民增收为目的，以结构调整为主线，确定了四大支柱产业；以苹果为主的优质水果产业、以酸枣接大枣为主的干果产业，以牛、羊、鸡为主的畜牧养殖产业，以大黄、黄芹、生地为主的中药材种植产业，引导农民致富奔小康。

At last, based on the methods above, a PROFIBUS-based networked motion control prototype system and a CANopen-based networked multi-axes motion control system of shearing machine were realized.

最后，基于上述方法，完成了基于PROFIBUS的网络化运动控制原型系统和基于CANopen的剪板机网络化多轴同步控制系统的开发。

Based on the electronic focus technology development of state-of-the-art,the paper suggested a complete apparatus s cheme ofauto-focus based on SSPD(self-scanned photodiode array)and 8098 singl e chipprocessor,giving out a focus criterion algorithm based on image high freq uencystatistics.The function of auto-focus of both reflected and transparent o pticalmicroscope was realized.Meanwhile some corresponding problems such as sta bility of lightsource,step motor driving etc.were also discussed,which greatly improved the accuracy andreliability of the system.

文摘：在介绍与分析了国内外电子调焦系统的技术发展与现状的基础上，提出了一种基于SSPD与8098单片微处理器自动调焦的整体技术方案，给出了基于图像高频成分统计的聚焦判识算法，在此基础上实现了反射式与透射式光学显微镜的自动调焦，同时对系统的可靠性有关的其它相关问题如光源稳定性、步进电机驱动等问题也进行了讨论。

This paper presents a workflow management system based on software agent. It applies an activity-based modeling method and builds formal workflow model. It also puts forward an agent model composed of activity model, intention model, skill model, self-capacity model and companion model to implement workflow management. An agent federation which can be nested is constructed to enhance system flexibility and a shared domain ontology based on workflow is defined to support semantic interoperation among agents.

文章提出了一种基于软件agent的工作流管理系统，采用基于活动的工作流建模方法，建立了形式化的工作流模型，在此基础上，定义了包括活动、意向、技能、自身能力、伙伴等模型的实现工作流运行的agent模型，构建了可嵌套的agent联邦结构，增强了系统的灵活性，并定义了基于工作流的共享领域本体论，支持agent间的语义互操作。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。