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김홍일(Hongil Kim),한재흥(Jae-Hung Han),양호순(Hosoon Yang),조창래(Changrae Cho),조혁진(Hyokjin Cho),김홍배(Hong-Bae Kim) 한국항공우주학회 2008 韓國航空宇宙學會誌 Vol.36 No.9
우주용 구조물에 사용되는 재료는 치수 안정성을 위해서 열팽창계수를 최소화하도록 설계, 제작되어야 한다. 이를 위하여 우주용 재료 시편의 정밀한 열팽창계수를 측정하여, 그 재료의 열 특성에 대한 정확한 데이터를 확보할 필요가 있다. 그리고 시편뿐만 아니라 실제 사용될 구조물의 열 변형을 우주 환경에서 직접 측정할 필요가 있다. 따라서 본 연구에서는 고진공에서 정밀한 변위 측정을 위하여 변위 측정 간섭계와 항우연의 보조 챔버를 활용한 열팽창계수 측정 시스템을 설계하였다. 또한 본 측정 시스템은 길이 500㎜ 정도의 긴 구조물의 열 변형을 측정할 수 있으며, 전체 시스템의 불확도는 0.01ppm/K 미만이 되도록 설계되었다. Structures being used in space environment, should be designed to have minimum CTE(coefficient of thermal expansion) for the dimensional stability. Accurate CTE data of the materials are required to design the space structures consisting of various materials. There are uncertainties in the characteristics of materials even though the same manufacturing processes are applied. Therefore, it is needed to measure the thermal deformation of not only the material specimen but also substructures in simulated space environment, such as high vacuum condition. In this research, therefore, precise CTE measurement system using displacement measuring interferometer and vacuum chamber has been designed with uncertainty analysis of the measurements. This system can be used to measure the CTE of the specimen or thermal expansion of the substructure with varying size up to 50cm in length. To measure the low CTE material, overall uncertainty of this system is expected under 0.01ppm/K.
이희석,이제,이충석,조창래,손주찬,백종명 한국경영과학회 1998 한국경영과학회 학술대회논문집 Vol.- No.2
Currently, many companies are trying to be more competitive by implementing the most appropriate software package, called ERP (Enterprise Resource Planning). ERP can support the company business process. A repository, which can support the company's business process. A repository, which can store and retrieve enterprise-wide information, is a key component of such software package. This paper implements an enterprise repository for the ERP. A well-known repository standard, IRDS (Information Resource Dictionary System), is employed for the repository architecture. A meta schema that can help develop database, business applications, models, and workflow is proposed. To illustrate the practical usefulness, a real-life ERP prototype is built within the framework of the proposed repository.