• 한국전자거래학회지
• /
• 제3권1호
• /
• pp.1-22
• /
• 1998

SDAI (Standard Data Access Interface) is an interface specification of accessing various storage systems such as file systems and database management systems for STEP data. Using SDAI, both application program developers and CAD/CAM system developers can be relieved from dealing with STEP physical file or system dependent DBMS operations. In this paper, we present implementations of SDAI on different data models, i.e., relational, extended relational, and object-oriented. In order to implement SDAI, we need to translate the EXPRESS information model into target data models. The schema translation process for three different data models are compared and other implementation issues are discussed.

• 대한산업공학회지
• /
• 제28권4호
• /
• pp.435-442
• /
• 2002

It is difficult to access and share design data among heterogeneous CAD systems. Usually, different CAD systems exchange the design data using a neutral format such as IGES or STEP. A prototype CAD system which uses a geometric kernel and a commercial database management system has been implemented. The prototype system used the Open Cascade geometric kernel and the commercial object-oriented database ObjectStore. STEP provides the database schema. The database can be accessed from commercial CAD systems such as SolidWorks or Unigraphics. The data access module from a commercial CAD system is developed with the CAD system's native API, ObjectStore API functions, and ActiveX.

• 한국CDE학회논문집
• /
• 제7권3호
• /
• pp.202-209
• /
• 2002

It is difficult to support collaborative design with a conventional ship CAD system which manages design information using files. In this research, file storage has been replaced with a database. This paper describes the OpenDIS which is an interface between the geometric kernel and the database. Its main purpose is to implement the CAD system which has the STEP database as the native storage. A prototype CAD system has been implemented using that OpenDIS interface which is implemented by OpenCascade geometric kernel and the Objectstore object-oriented database. The STEP methodology is used as the database schema. This CAD system has been applied to the hull design of a ship in order to verify the usefulness of the interface.

• 한국전자거래학회:학술대회논문집
• /
• 한국전자거래학회 1997년도 한국전자거래학회 종합학술대회지
• /
• pp.333-346
• /
• 1997

AP Modularization $\circledcirc$ PDES $\circledcirc$ Modular extension to AP203: plug ＆ play schema subsets $\circledcirc$ AM (appl. module) is an interpreted model $\circledcirc$ Similar to AIC $\circledcirc$ Use Express-X instead of mapping table $\circledcirc$ Building Blocks $\circledcirc$ Physical analogy: Sub-assembly(omitted)

• 한국통신학회논문지
• /
• 제29권5B호
• /
• pp.482-490
• /
• 2004

최근 XML 문서가 인터넷 기반의 애플리케이션간의 자료 저장 및 교환을 위한 표준으로서 부상함에 따라 XML 문서의 저장 및 관리에 대한 연구가 활발히 이루어지고 있다. 하지만 대부분의 연구들은 인스턴스 및 DTD 기반의 매핑 기술에 관한 것으로 문서의 구조적 변환께만 초점이 맞추어져 있었다. 현재는 XML 스키마 기반의 XML 문서 이용이 보편화되고 있는 추세이며 구조적 변환 이외에도 의미의 보존이 아울러 요구되고 있다. 이에 본 논문에서는 XML 스키마에 기반 한 MPEG-21의 DIDL(Digital Item Declaration Language) 언어를 응용 도메인으로 설정하곡 의미적 제약조건을 확장하여 보존할 수 있는 매핑 모델을 제안하였다. 기존의 연구결과를 제시된 도메인에 적절하게 확장하여 전처리 단계에서 적용한 후, 의미 정보의 보존을 위한 다양한 후처리 과정을 설계단계에 적용하였다. 구현에 적용된 시스템의 구성 및 제안 알고리즘을 소개하고, 구현 환경 및 상세한 의미적 확장기법을 제시하였으며, 테이블과 질의 예제를 통한 질의처리 예제를 보였다.

• 한국멀티미디어학회논문지
• /
• 제7권9호
• /
• pp.1208-1218
• /
• 2004

B2B 전자상거래와 같이 XML을 이용한 정보 교환이 확산되고 있으며 이에 따라 상호 교환되는 정보에 대하여 체계적이며 안정적인 저장관리가 요구되고 있다. 이를 위해 XML응용과 데이터베이스 연계를 위한 다양한 연구가 관계형 데이터베이스를 중심으로 수행되었다. 그러나 계층구조를 갖는 XML 데이터를 2차원 테이블의 집합인 관계형 정보로 표현하는 관계형 데이터베이스로의 저장에는 본질적인 한계가 있어, 각 구조화된 정보를 객체-관계형 데이터베이스로 저장하기 위한 모델링 방안이 요구된다. 양질의 어플리케이션 시스템을 구측하기 위해서는 우선적으로 모델링이 중요하다. 1997년에 OMG는 표준 모델링 언어로 UML를 채택하였고, 이에 따라UML은 보다 널리 사용될 것이다. 그러므로 효율적인 XML어플리케이션을 개발하는데 UML에 기반을 둔 설계 방법론이 필요하다고 할 수 있다. 본 논문에서는 UML을 이용하여 객체-관계형 데이터베이스기반의 XML 응용을 위한 설계 방법론을 제안한다. UML를 도출해 내기 위한 체계적인 3단계 방법론을 제안하고, 만들어진 UML을 이용하여 W3C XML Schema를 설계하기 위한 XML 모델링 방안을 제시한다. 아울러 교환되는 XML데이터를 효율적으로 저장하기 위하여 객체-관계형 데이터베이스 스키마 설계를 위한 데이터 모델링 방법을 제안한다.

• 산업공학
• /
• 제17권2호
• /
• pp.226-232
• /
• 2004

In shipbuilding area, data sharing is one of the crucial issues. Recently, for collaborative design, ship structural CAD systems adopt the database as its primary storage. Database is useful to deal with the large amount of design information among the heterogeneous design department and design stage. To make the database-based CAD system object-oriented database(OODB) and object-relational database(ORDB) can be used. It is important to select proper database because the CAD system performance mainly depends on access performance of database. In this research, using prototype CAD system from other research, access performance of OODB and ORDB form CAD system was evaluated. STEP application protocol was used as the database schema and experiment was made in query by property and query by region. The results give some idea of how to choose the database for CAD systems.

• 한국CDE학회논문집
• /
• 제10권2호
• /
• pp.97-106
• /
• 2005

W3C has developed the RDF standard for utilizing ontology in Web applications. This paper presents extracting, storing, and applying ontology on product data. The design and tooling information included in STEP-NC files is focused as an example. By analyzing the relationship among the product data, the RDF schema is designed first. Based on the schema ontology if extracted and stored in XML files. As an application of the stored ontology, we can reconfigure the sitemap of product data repositories. In this example, the users can select the view that he or she is interested in (e.g. product, tool, person). With such various views of an product data repository, the users can access the specific data more effectively.

• 한국CDE학회논문집
• /
• 제4권4호
• /
• pp.371-380
• /
• 1999

This study proposes a process information model which can integrate various activities during the product development process, the system which can manage the process. Development process information will allow designers and managers to access previous tasks readily and utilize the information in making decisions at hand. While developing products in heterogeneous and distributed environments, concurrent and collaborative designs can be achieved by STEP. The process model in this study divides the task of product development into two fundamental parts, Specific Process(SP) and Normal Process(NP). SP includes the specific information and refer to those defined by prior STEP. NP is routine process excluded from being defined as SP. Due data information can be added to manage development pace and to show delayed tasks. As two or more different processes can be linked to show the entire development flow, Static STEP information can be dynamically interlaced. Remote location operations can be incorporated on the Internet using STEP, and information can be shared. The system has been built upon a process model schema so that task stage, design history, and different development style can be managed and accessed for each component. The system has been proven efficient in information management and exchange by several scenario testings.

• 한국CDE학회논문집
• /
• 제9권3호
• /
• pp.238-245
• /
• 2004

This paper describes an architecture information management system using XML. The purpose of the system is to manage the information stored in standard format, XML, that has many valuable properties. The proposed architecture information consists of project information, drawing information, and material information. Each information is expressed using XML and for each information, XML schema is presented in this paper. In this system, detail information of materials that exists on the supplier's homepage can be displayed when the user of the system wants to check the detail information. Also, drawings stored in STEP data can be browsed in this system. The reports of each information are prepared using XSL. The proposed system shows that XML can be used for a format to store architecture information and various functions can be implemented based on XML related standards.