An object oriented data modelling in computer aided design (CAD) databases is focused. Starting with the discussion of data modelling requirements for CAD applications, appropriate data modelling features are introdu...An object oriented data modelling in computer aided design (CAD) databases is focused. Starting with the discussion of data modelling requirements for CAD applications, appropriate data modelling features are introduced herewith. A feasible approach to select the “best” data model for an application is to analyze the data which has to be stored in the database. A data model is appropriate for modelling a given task if the information of the application environment can be easily mapped to the data model. Thus, the involved data are analyzed and then object oriented data model appropriate for CAD applications are derived. Based on the reviewed object oriented techniques applied in CAD, object oriented data modelling in CAD is addressed in details. At last 3D geometrical data models and implementation of their data model using the object oriented method are presented.展开更多
FMC,是FLIGHT MANAGE-MENT COMPUTER的缩写,即飞行管理计算机.其中有两类数据库.一类是导航数据,存储有高/低空图、进/离场图,各机场、导航台、航路点等数据,一应俱全,提高了 L NAV(水平导航)的能力.另一类是性能数据库,存储有飞行员的...FMC,是FLIGHT MANAGE-MENT COMPUTER的缩写,即飞行管理计算机.其中有两类数据库.一类是导航数据,存储有高/低空图、进/离场图,各机场、导航台、航路点等数据,一应俱全,提高了 L NAV(水平导航)的能力.另一类是性能数据库,存储有飞行员的使用手册第三册,即性能手册的内容.在飞行员输入了本次航班的全重(或无油重量)、成本指数、巡航高度等数据后,它就能进行 V NAV(垂直导航)的计算,计算出最大高度、各阶段的经济速度及推力极限.FMC可以说是飞行员的好帮手.展开更多
Use the Internet for online learning has become one of the directions of the development of education, the traditional classroom learning, the breakthrough time and geographical constraints, more convenient interactio...Use the Internet for online learning has become one of the directions of the development of education, the traditional classroom learning, the breakthrough time and geographical constraints, more convenient interaction between teachers and students, learning resources are more abundant, more diverse learning styles, has broad application prospects. System uses B / S mode, the application of Java language, together with the MySQL database, high security and good performance.展开更多
In this paper,a detailed data list of water plan is given,based on its characteristics.This paper discusses the principles ofestablishing a system of standards for a water plan database,and amethod of modeling the wat...In this paper,a detailed data list of water plan is given,based on its characteristics.This paper discusses the principles ofestablishing a system of standards for a water plan database,and amethod of modeling the water plan data.The information is presentedin a standardization system graph.展开更多
文摘An object oriented data modelling in computer aided design (CAD) databases is focused. Starting with the discussion of data modelling requirements for CAD applications, appropriate data modelling features are introduced herewith. A feasible approach to select the “best” data model for an application is to analyze the data which has to be stored in the database. A data model is appropriate for modelling a given task if the information of the application environment can be easily mapped to the data model. Thus, the involved data are analyzed and then object oriented data model appropriate for CAD applications are derived. Based on the reviewed object oriented techniques applied in CAD, object oriented data modelling in CAD is addressed in details. At last 3D geometrical data models and implementation of their data model using the object oriented method are presented.
文摘FMC,是FLIGHT MANAGE-MENT COMPUTER的缩写,即飞行管理计算机.其中有两类数据库.一类是导航数据,存储有高/低空图、进/离场图,各机场、导航台、航路点等数据,一应俱全,提高了 L NAV(水平导航)的能力.另一类是性能数据库,存储有飞行员的使用手册第三册,即性能手册的内容.在飞行员输入了本次航班的全重(或无油重量)、成本指数、巡航高度等数据后,它就能进行 V NAV(垂直导航)的计算,计算出最大高度、各阶段的经济速度及推力极限.FMC可以说是飞行员的好帮手.
文摘Use the Internet for online learning has become one of the directions of the development of education, the traditional classroom learning, the breakthrough time and geographical constraints, more convenient interaction between teachers and students, learning resources are more abundant, more diverse learning styles, has broad application prospects. System uses B / S mode, the application of Java language, together with the MySQL database, high security and good performance.
文摘In this paper,a detailed data list of water plan is given,based on its characteristics.This paper discusses the principles ofestablishing a system of standards for a water plan database,and amethod of modeling the water plan data.The information is presentedin a standardization system graph.
