数据库

Completion of the project in the city coordinate system transformation, high-resolution true color aerial photography, urban large-scale aerial digital mapping, and has produced a planning area covering Orthophoto Map, to establish a foundation for geospatial databases and geographic information platform for the acquisition of municipal mapping departments 3, a microcomputer, 1 plotter, equipped with a database management software infrastructure.

项目完成了城区坐标系统改造，高分辨率真彩色航空摄影，城市大比例尺航测数字化测绘，制作了覆盖规划区的正射影像图，建立了基础地理空间数据库和地理信息平台，为市测绘部门购置了3台微机、1台绘图仪，配备了数据库管理基础软件。

In DAS model,one important problem faced is how to improve the query efficiency in the encryption database,and cryptograph index technology is one of the methods to improve cryptograph query efficiency in database.

DAS模型下，如何提高密文数据库的查询效率是当前面临的一个主要问题，而密文索引技术是提高数据库中密文查询效率的手段之一。

Cst 290. Database Management Systems Design and Development. This course covers the concepts, theory and application of database management systems and its development methodology.

Cst 290。数据库管理系统的设计和开发该课程涵盖了数据库管理系统的概念、原理和应用，以及它的开发技术。

In the course of development of the application system of data base , it is a very important problem that the structure of the data base is designed.

在数据库应用系统的开发过程中，数据库的结构设计是一个非常重要的问题。

Access data base is established and the way to manage it is studied.

构建了Access数据库，并研究数据库的管理方法。

However, this dissertation concentrates on the following topics: First, a new image semantic data model and object description language have been proposed in this dissertation based on the characteristics of image information.

主要内容包括：(1)图像数据库系统模型研究。针对图像信息的特点，建立了图像数据库系统的对象语义模型ISDM及相应的对象描述语言。

To improve the openness and maintainability, the data is classified and data dictionary is also composed.

为提高数据库的开放性、可维护性，对数据进行了分类，编制了数据库数据字典。

In database system, data integrity problem can affect the normal use of database.

在数据库系统中，数据完整性问题会影响数据库正常使用。

In order to realize data sharing,identifying corresponding attributes is an important issue in heterogeneous databases.

为了实现异构数据库的数据共享，关键的问题就是要找出数据库间的相同属性。

In order to gain the information, an efficient and effective algorithm is required to scan the whole databank.

为了从数据库中获取知识，我们需要设计一种挖掘算法能够有效搜索整个数据库。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐