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조완수(Cho Wan Soo),배해영(Bae Hae Young) 한국정보처리학회 1996 정보처리학회논문지 Vol.3 No.1
In order to design extended relational database management system supporting mutilevel security, the standard relational data model is extended and new relational integrity constraints are proposed for the model. The extended relational model and proposed multilevel integrity constraints maintain database in consistent state and produce a basis that can eliminate ambiguity of entity and relationship representations by polyinstantiation. The proposed update semantics can increase the efficiency of update operations by supporting multilevel entry and updates. The semantics also provides a basis for the implementation of decomposition of extended relations.
CFD를 활용한 밀폐공간 가스질식사고의 피해 영향 평가
조완수 ( Wan Su Cho ),김의수 ( Eui Soo Kim ) 한국안전학회(구 한국산업안전학회) 2018 한국안전학회지 Vol.33 No.5
Recently, various engineering approaches have been widely used in the accident investigation field to identify the cause of the accident and to predict damage by accident. Computational analysis is the most commonly used method of accident investigation technique. This technique is mainly used to identify the mechanism of the accident generation and to determine the cause when it is difficult to reproduce the situation at the time of the accident or when it is impossible to perform a reproduction experiment. In this study, The computational fluid dynamics analysis for nitrogen asphyxiation accident generated by defect of building structural between diffusion outlet and cooling tower was performed to determine the inflow path of the suffocation gas, death possibility by concentration of suffocation gas and predicted the time of death due to the accident using 3D modeling and FLACS program. We can quantify diffusion concentration of asphyxiation gas and predict mechanism of death occurrence by accident and evaluate the consequence Analysis through this study. In the future, This method can be widely used in the field of gas safety by improving the reliability and validity of the analysis.