系统功能

This paper is a research on receiving technology of Set Top Box of cable digital television conformed to MPEG-2 and DVB-C. In this paper, firstly, the structure of hardware platform and the function of hardware parts are discoursed; Secondly, the software system is studied from the point of view of software levels and software modules, and the function of every software level and every software module is also discussed detailedly.

本文对符合MPEG-2和DVB-C标准的数字电视机顶盒进行了研究，对硬件系统的组成以及各个部分实现的功能进行了论述，从软件层次和软件模块的角度对数字电视机顶盒的软件系统进行了分析，并对每个软件层的功能以及每个模块将要实现的功能进行了详细的论述。

Considering the coupling connections among the functional cells and their complicated relationships,such as connection in series, in parallel and in both of them and so on, as well as among the sub-structures, a computerized conceptual design method is given out for mechanical systems based on the function decomposition and recomposition method.

考虑了功能元之间的联结关系和子结构之间的串联、并联、复合等复杂关系，给出了一种基于功能分解与重组的计算机化的机械系统概念设计方法。根据功能元之间的联结关系和子结构之间的复杂关系，利用该方法可以得到有限数量的原理方案，避免了形态矩阵方法在处理复杂机械系统时出现的解爆炸问题。

First, this thesis introduces basic theory of CBR , and studies many aspects of typical part design case , such as case representation, case retrieval, retain etc. Second, regards design code as case code in order to integrate the case with geometrical and non- geometrical information, and realizes the parametric modifying function for 3D solid model in the condition of Pro/E. Third, for the purpose of making true of system's aided design requirement, this thesis brings forward to create part design knowledge base with AI language CLIPS, and integrates the rule based KB into the system; finally, collects and summarizes the knowledge of shaft,gear,sleave, and a sample with ladder—shaft is shown in order to verify the correction of theory research.

首先，本文介绍CBR技术的基础理论，并重点研究典型零件案例的表示、检索、修改等功能；其次，以零件设计编号为案例编号实现对案例的几何与非几何信息的集成，并实现了三维实体模型在Pro／E环境下的参数化修改功能；再次，从系统辅助设计功能要求出发，提出将基于规则的知识库嵌入到系统内部，用人工智能语言CLIPS建立零件设计知识库；最后，对轴类、齿轮类、盘套类零件案例知识进行收集、总结，并通过阶梯轴设计实例验证了理论研究的正确性。

It show the functions of both constructing the sentences in language system and titling the objective things or phenomenon in society.

词汇系统的外部功能主要表现为在语言系统中的造句功能和对社会客观事物、现象的称谓功能两方面。

The system c function of users increase, delete and the cipher modification, aport form to print.

查询功能也是系统的核心之一。此外，系统有完整的用户添加、删除和密码修改功能，并具备报表打印功能。

Third, introducing the evaluation theory of ecosystem service, it set up an appraisable system of ecosystem service values of water resources, which is specially carried on to Haihe Basin too. Fourth, it coupled the evaluation theory of ecological service function and the holistic analysis model of water resources carrying capacity for a try, and then set up the analysis mechanism of regional macro-economy, water resources and ecological environment, which carried on a preliminary research of carrying capacity of ecological environment of water resources in Haihe Basin.

第二，建立了水资源承载能力分析模型，针对海河流域进行专门的分析，提出流域合理的经济社会发展规划参考目标，第三，引入生态系统服务功能价值理论，建立了水资源生态系统服务功能价值评价体系，并在海河流域内进行实践应用，第四，将生态服务功能价值理念与水资源承载能力分析模型进行尝试性的耦合，初步提出基于区域宏观经济、水资源及生态环境分析机制的流域的水资源生态环境承载能力分析框架。

Based on the above research, the article discusses the process using ASP and ADO technique to manage and update database; studies the setting of purview to assure the security of system; discusses the function of layercontrol, eagle-eye navigation, search of information and etc.; discusses the function of statistic and analysis by the process doing the caky statistic chart of roadbed disease; analyzes the doing of distributing special map of disease and engineering with the character of rail-track engineering GIS.

在以上总体研究的基础上，讨论了利用ASP和ADO技术管理和更新远程铁路工务数据库的实现过程；为了保证系统使用的安全性，研究了对用户使用权限的设置；讨论了图层控制、鹰眼导航等地图操作功能以及信息查询功能的实现过程；以路基病害分析的饼状统计图的制作过程为例讨论了统计分析的功能；针对铁路工务地理信息系统的特点，分析了病害和维修工程分布专题图的制作。

mitochondrial dnais the only inheritant substance except for the nuclear dna in a euˉkaryon cell,which is related to the oxidative phosphorylation of a cell.mitochondrial dna is the important target of carcinogens and is vulnerable because of its structure and function.the mutation of mtdna could reduce the nomal respitation and release large quantities of ros,whichincrease the danger of cancer happening.so,mtdna has been thought to be involved in carcinogenesis and recently more and more studies in this aspect have comeout.in this paˉper,we review the researches for relationship among mtdna mutation and tumors in digestion system,woman system,head and neck,urinary systemand blood system.

线粒体dna（mitochondrial dna，mt dna）是真核细胞中唯一存在的独立于核dna之外的遗传物质，与细胞的氧化磷酸化功能密切相关。mtdna自身的结构和功能特点决定了它是致癌物作用的重要靶点，易受致癌因素的损伤而发生突变。mtdna的突变可削弱正常的呼吸功能，释放高水平的活性氧，进而增加肿瘤发生的危险性，所以mtdna被认为与肿瘤发生有密切关系。近年来，这方面的研究越来越多，本文现就mtdna突变与消化系统肿瘤、妇科肿瘤、头颈部肿瘤、泌尿系统肿瘤等实体瘤以及血液系统恶性肿瘤之间的关系作一简单的综述。

If we want to bring the strategic, managemental, and developmental functions of the performance management system into full play, we must relate it to all other parts of a complete operational and managemental system of an organization, i.e.

要想使绩效管理系统发挥它的战略功能、管理功能和开发功能，就必须将其同整个企业经营管理这个大系统的其他各部分联系起来，即同组织的其他职能联系起来。

this article is research of application of 3d design software ug carries on the components entity design and movement analysis to the boring lathe main axle system.through the method of virtual design and analysis, obtains the design manufacture or the optimized design reference information and data .first complete the boring lathe main axle system's entity components modelling and assembles using the ug formidable entity modelling function and the assembly function,and then establishes the scenario model under the ug organization analysis function module and completes the movement to analyze.obtains on the main axle components the specified point speed, the acceleration and the displacement on a ideal characteristic parameter and output analysis result of obtains office of destination law of motion by the graph form.

本文是应用3维软件ug对镗床主轴系统进行0件实体设计和运动分析的研究。通过虚拟设计的方法进行设计与分析，得到设计制造或者优化设计的参考信息和数据。应用ug强大的实体造型功能和装配功能首先完成镗床主轴系统的实体0件建模和组装，再对装配好的组件在ug机构分析功能模块下建立scenario模型并完成运动分析，得到主轴0件上特定点的速度、加速度和位移等理想的特征参数并以图表的形式输出分析结果得到指定点的运动规律。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。