ENTITY-ROLES MODEL AND OBJECT-ORIENTED KNOWLEDGE/DATA BASES

A Model, called 'Entity-Roles' is proposed in this paper in which the world of Interest is viewed as some mathematical structure. With respect to this structure, a First order (three-valued) Logic Language is constructured.Any world to be modelled can be logically specified in this Language. The integrity constraints on the database and the deducing rules within the Database world are derived from the proper axioms of the world being modelled.

OBJECT ORIENTED DATA MODELLING WITH APPLICATIONS TO CAD

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.

Data Model Transformation in CAD System for Multi View Modeling

This paper describes multi view modeling and data model transformation for the modeling. We have proposed a reference model of CAD system generation, which can be applied to various domain specific languages. However, the current CAD system generation cannot integrate data of multiple domains. Generally each domain has its own view of products. For example, in the domain of architectural structure, designers extract the necessary data from the data in architecture design. Domain experts translate one view into another view beyond domains using their own brains.The multi view modeling is a way to integrate product data of multiple domains, and make it possible to translate views among various domains by computers.

AN INTEGRATED DATA MODEL IN THREE DIMENSIONAL GIS

The current GIS can only deal with 2-D or 2.5-D information on the earth surface. A new 3-D data structure and data model need to be designed for the 3-D GIS. This paper analyzes diverse 3-D spatial phenomena from mine to geology and their complicated relations, and proposes several new kinds of spatial objects including cross-section, column body and digital surface model to represent some special spatial phenomena like tunnels and irregular surfaces of an ore body. An integrated data structure including vector, raster and object-oriented data models is used to represent various 3-D spatial objects and their relations. The integrated data structure and object-oriented data model can be used as bases to design and realize a 3-D geographic information system.

Using UML Behavioral Model to Support Aspect Oriented Model

Aspect oriented software development is an emerging paradigm of software development. The notion of this technique is separation of concerns which means to implement each concern in a single object in object oriented programming but still there are concerns which are distributed on different objects and are called crosscutting concerns while another form is Core concerns are the core functionality provided by the system but crosscutting concerns are the concerns like logging, performance etc. Modeling of aspect oriented software is different from the normal modeling of object-oriented or procedural language software, because aspects don’t have the independent identity or existence and they are tightly coupled to their woven context so it is difficult to model them. The one aim of our research paper is to explore the domain of Modeling of the aspect-oriented software. The goal of this research paper is to give a UML Behavioral modeling techniques in the domain of aspect oriented software development. This technique of generating UML Behavioral Model for aspects will give better understating of separations concerns.

Modeling and OLAP Cubes for Database of Ground and Municipal Water Supply

Modeling plays an important role for the solution of the complex research problems. When the database became large and complex then it is necessary to create a unified model for getting the desired information in the minimum time and to implement the model in a better way. The present paper deals with the modeling for searching of the desired information from a large database by storing the data inside the three dimensional data cubes. A sample case study is considered as a real data related to the ground water and municipal water supply, which contains the data from the various localities of a city. For the demonstration purpose, a sample size is taken as nine but when it becomes very large for number of localities of different cities then it is necessary to store the data inside data cubes. A well known object-oriented Unified Modeling Language (UML) is used to create Unified class and state models. For verification purpose, sample queries are also performed and corresponding results are depicted.

过失速重新定向机动过程气动特性建模

以过失速重新定向技术为基础的自翻转越肩飞行器与传统越肩发射飞行器相比,具有响应时间短、机动性能高、射程远等优势。本文针对飞行器过失速重新定向机动过程,基于CFD动态计算数据分析了该过程中的飞行器气动特性,通过改进微分方程模型成功描述了机动过程中的迟滞环效应,同时验证了最小二乘支持向量机方法在此建模问题中的适用性。本文的建模方法可以准确捕捉飞行器过失速重新定向机动过程中的非线性非定常气动特性,为飞行器过失速重新定向机动控制律设计提供模型基础。

基于面向对象技术和标准关系数据库的Geodatabase的研究

面向对象技术为空间数据模型的发展提出了新的要求。本论文在此背景下,回顾了空间数据模型的发展历程,从整体上介绍了第三代基于面向对象技术和关系数据库的Geodatabase数据模型,并详细介绍了其体系结构及在关系数据库中的存储。最后本文通过总结Geodatabase模型的优缺点,提出了未来空间数据模型的发展趋势。

面向对象空间数据模型——Geodatabase及其实现

通过回顾地理数据模型的发展历程,介绍了RACGIS8所推出的新型的面向对象的空间数据模型——Geodatabase的产生及其特点;分析了Geodatabase数据模型在空间信息存储与管理方面的优势,并对模型的实现过程予以阐述。

新农科背景下数据科学导论课程的教学探索

近年来,随着机器学习等新兴数据分析技术的快速发展,不仅数据科学被确立为新的本科专业,其相关技术也被大量应用在农业领域。在新的时代背景下,增强农科学生的数据分析能力、促进农学与数据科学的交叉融合成为加快新农科建设的重要方向之一。然而,目前国内农林院校开设数据科学导论课程的极少,尤其缺乏以问题为导向并结合最新分析工具的数据科学课。对此,以甘肃农业大学数据科学导论课程为例,介绍并分析课程目标、内容设计和教学实践等情况,同时提出开展相关课程的建议。以期为新农科背景下农林院校开展数据科学导论课程建设、培养新型农业人才提供参考。

品质导向的城市滨水区更新决策路径研究

随着中国城镇化步入“下半程”,城市更新的品质化需求日益提升。在此背景下,城市滨水区作为当前城市转型发展、提升城市宜居性和竞争力的承载空间,构建以多源大数据为支撑的滨水区量化品质评价模型,提出包含形态、活力、感受3个维度的评价指标体系,并以上海黄浦江滨江核心影响范围的760个地块为样本,通过多源数据进行大规模与高精度的量化测度,采用层次聚类法算法对各地块的品质状况进行识别与分类,得出6组地块类型,再分类提出品质提升策略,为滨水地区更新提供精准设计导控。

“Spark大数据技术与应用”课程混合教学模式实践

随着云计算、大数据、人工智能等新一代信息技术的迅速发展和广泛应用,智慧教育已经成为信息技术与教育发展高度融合的新型教育模式。依据苏州百年职业学院工学院学生的学情和课程特点,基于成果导向教育理念,构建了大数据技术与应用课程的混合教学模式,从课前自主探索、课中导学、课后拓展三大环节具体说明了混合教学模式实施方法。借助智慧教学平台和信息化工具,混合式教学得以顺利实施,在“Spark大数据技术与应用”课程实施中取得了良好教学效果。

利用Geodatabase建模

本文介绍了采用面向对象技术的新一代地理数据模型Geodatabase的特点,举例说明了利用Geodatabase数据模型对地理对象建模的过程及其在数字中国地理空间框架建设中的重要意义。

第三代地理数据模型——Geodatabase及其实现

简要阐述了地理数据模型的发展历程,详细分析了Geodatabase数据模型及其特点,并结合实例说明了Geodatabase数据模型的实现过程,从而验证了Geodatabase数据模型对于处理复杂地理对象具有强大的优越性。

An Open Architecture and Implementation for Product Data Management

In this paper, an open architecture and its implementation for product data management are presented. The system architecture, product data definition model, and a set of components of the architecture are discussed in detail. Especially, the principle and some mechanism of one of the components, an object oriented database management system GH-EODB, are discussed in more detail. The architecture is extensible and adaptable.

Study on 3D Geological Model of Highway Tunnels Modeling Method

Geology is the base for highways and tunnels construction. With the fast development of national highway construction, highway tunnel construction project are more and more complex. The completeness and accuracy are essential for the planning, design and construction of projects, while the ground information is quite poor in systematic, reliable and timely aspects. Therefore, the development of underground road tunnels, and the implementation of informationized spatial information management is urgent for highway construction. 3D geological tunnel model is intuitive, high efficient and convenience which greatly facilitates the maintenance and security of highway tunnels construction and it will be the trend for the future highway tunnel development.

数据导向审计体系构建:风险模型、方法体系与实现路径

数据作为数字经济时代新的生产要素,深刻影响着各行各业的发展和变化。数据导向审计是充分利用数据进行审计的技术与方法,是数字化时代审计高质量发展的客观要求。本文研究的主要内容是从审计风险模型的发展出发,对实施数据导向审计的必然性进行深入论述;创造性提出了数据导向审计的审计风险模型,并系统分析了其构成要素的相关审计方法体系;最后指明数据导向审计的实现路径,并具体论述了实现路径的具体措施。研究成果不仅可以为构建数据导向审计体系丰富理论基础,而且能促进数据导向审计体系构建,为实施数据导向审计体系提供理论支持和实践指引。

FIRST ORDER LANGUAGE FOR ENTITY-ROLES MODEL^+

With respect to the mathematical structure supposed by theEntity-Roles Model. a first order (three--valued) logic language is constructured. A world to be modelled can be logically specified in this language. The integrity constraints on the database and

“辽金古城”遗址空间数据模型构建与融合式检索研究

为了解决“辽金古城”遗址个性化的空间数据表达与管理问题,该文基于面向对象和空间数据库思想,在古城空间结构和拓扑关系分析的基础上,从空间特征、图形表达、属性结构和数据集组织层次等4个方面构建古城空间模型;然后,根据数据查询、修改和分析现实需求,设计相应的数据管理、数据查询、操纵和分析方案并采用ArcGIS Geodatabase空间数据库,以“C#+OLEDB+ArcEngine”编程模式,解决整体与个体古城空间数据间的联动管理问题,验证古城空间数据模型实例化和数据管理关键技术。研究结果表明,古城空间模型构建的关键是利用线图形、面图形反映古城主体框架和主体结构,点图形表示古城重点要素。图形间的空间拓扑要严谨,以反映地物之间的关系,每个要素类单独设计属性结构反映其主要文化内涵和空间信息,采用数据库封装方式管理古城要素;基于该文提出的空间数据模型将古城视作独立对象进行实例化,通过程序对文件、数据库、SQL语言进行融合式算法设计,可实现个体、总体古城数据交互式查询和管理,并可利用GIS软件平台和二次开发技术解决古城空间数据空间显示与分析问题。该研究为古城空间数据建模与管理提供一种可行的方法,对其他有个性化空间信息管理需求的实体建模具有一定的借鉴意义。

应用型本科高校青年教师胜任力模型探析

大数据背景下,应用型本科高校青年教师面临新的机遇与挑战,青年教师要具备一定的胜任力,才能在新时代更好地承担教书育人的使命。四川省A高校是一所应用型本科高校,通过分层抽样调查的方式,对该校21位青年教师进行深度访谈,并在此基础上运用扎根理论的经典编码构建大数据背景下应用型本科高校青年教师胜任力的“五星”模型。该模型由个人素养、教学能力、学习能力、实践能力和育人能力等五个维度构成。