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김기환,유상봉,차상균(K. W. Kim),S. B. Yoo,S. K. Cha 한국정보과학회 1996 정보과학회 컴퓨팅의 실제 논문지 Vol.2 No.3
CAD, CAM, CAE, 그리고 MRP 등의 생산 시스템에서 생성 되는 제품 데이타의 종류와 형식은 매우 다양하고 이에 따라 이종 시스템간의 데이타 교환이 큰 문제가 되어 왔다. 이러한 제품 데이타의 교환과 공유를 위하여 ISO(International Standard Organization)에서는 데이타 표준인 STEP(STandard for the Exchange of Product data)과 파일이나 데이타베이스 시스템과 같은 데이타 저장소에 대한 응용 프로토콜을 정의한 SDAI(Standard Data Access Interface)를 개발하였다. 본 논문은 SDAI가 정의하는 다양한 언어 바인딩 중 C++ 언어 바인딩을 구현하였으며, 이를 위해 STEP 데이타의 계층적 구조를 C++의 클래스 구조로 변환하였다. 데이타 저장소로는 널리 쓰이는 관계형 데이타베이스 시스템과 파일 시스템을 지원한다. 본 연구를 통해 구현된 SDAI를 이용해 응용 프로그램들은 파일이나 데이타베이스의 내부 구조와 오퍼레이션에 독립적으로 STEP 데이타를 저장 또는 인출 할 수 있다. As the technologies involved in todays manufacturing environment progress, the more electronic data are generated, exchanged, and managed. STEP(STandard for the Exchange of Product data) is an ISO project to build an information model to be shared among different computer-aided tools (such as CAD, CAM, CAE, and MRP) throughout the life cycle of a product. This paper presents an implementation of SDAI, which specifies the standard application protocols for accessing such storage systems as files and DBMSs. Among various language bindings defined for SDA(i.e., C, C++, and FORTRAN), C++ binding has been implemented. The object hierarchy of product data defined in STEP can be nicely mapped into the class hierarchy of C++. As for data repository systems, a relational database system and file systems are supported in this implementation. Using SDAI, application program can be relieved from dealing with STEP physical file or system dependent DBMS operations.
Fabrication and Test Results of Cryogenic Blower with Metal 3D Printing Impeller
Y. Kwon(권용현),J. Lee(이재환),K. Kim(김기환),J. Kim(김준일),S. Kim(김석호) Korean Society for Precision Engineering 2021 한국정밀공학회 학술발표대회 논문집 Vol.2021 No.11월
The demand for cryogenic blowers is increasing as the cooling system using superconducting applications and liquefied hydrogen increases. Cryogenic blowers are used to circulate cooling fluids in the temperature range of 20 to 40 K. Currently, most of the impellers of cryogenic blowers are made through machining, and there are restrictions on their manufacturing shape. If the conventional impeller manufacturing method using machining is replaced with 3D printing, processing cost reduction and variety of shapes can be expected. In this paper, the impeller, a core component of the cryogenic blower, was manufactured with a metal 3D printer to conduct design and performance evaluation. The operating condition of the cryogenic blower was designed at 5 bar, 20 K in gas helium. The output of the cryogenic blower is designed to have a maximum flow output of 12 g/s at 18,000 RPM and a head output of 58 m. The designed cryogenic blower was verified through CFD analysis, and performance test was performed with an impeller manufactured by machining. The impeller manufactured by 3D printing was replaced by the same blower and compared with the performance test results of the machining impeller.