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박동일 ( Dong Il Park ),안승섭 ( Seung Seop Ahn ),고병련 ( Byong Byeon Ko ),오영훈 ( Young Hun Oh ) 한국수처리학회 2015 한국수처리학회지 Vol.23 No.5
According to the analysis on previous studies of numerical modeling and evaluation of ground water effects, most of them focused on mediating variables, rather than a grid size. The first setting for modeling is a proper grid size of an area to analyze. Therefore, this study used the three-dimensional numerical analysis model MODFLOW to vary a grid size, to estimate an observation level and a calculation level, and to compare the characteristics of ground water. As a result, when the optimal mediating variable with the grid size of 50m×50m was estimated for the initial mediating variable, Mean error was 0.159, Mean absolute error 1.072, Root mean squared error 1.489. Therefore, the target area had applicability of numerical model. In the condition where the optimal mediating variable was fixed and a grid size varied, the model was applied. As a result, just as the value of observation level, the value of determination coefficient was 0.999. It indicated that mediating variable was more sensitive to ground water modeling than a grid size. Nevertheless, in the case of modeling for wells density area or for precision, each grid size was analyzed to be determined according to well in order for more accurate analysis. Therefore, it was found that it was necessary to set a proper grid size and assign each grid size to each well in order to increase accuracy of modeling.
Bio Clean Room(BCR)의 멸균을 위한 산소 클러스터이온 발생 장치 개발에 관한 연구
박동일(Dong-il Park),정광섭(Kwang-Seop Chung),김영일(Young-Il Kim),김성민(Sung-Min Kim) 대한설비공학회 2013 설비공학 논문집 Vol.25 No.1
Bio Clean Room(BCR) and pharmaceutical product manufacturing facilities require careful assessment of many factors, including HVAC, controls, room finishes, process equipment, room operations, and utilities. Flow of equipment, personnel, and product must also be considered along with system flexibility, redundancy, and maintenance shutdown strategies. It is important to involve designers, operators, commissioning staff, quality control, maintenance, constructors, validation personnel, and the production representative during the conceptual stage of design. Critical variables for room environment and types of controls vary greatly with the clean space’s intended purpose. It is particularly important to determine critical parameters with quality assurance to set limits and safety factors for temperature, humidity, room pressure, and other control requirements. In this paper, oxygen cluster ion equipment was utilized in order to enhance the indoor air quality and to prevent the airborne infection of ward in hospital. Moreover, the performance test of the equipment was also performed in order to develop the optimal sterilization system of BCR using the equipment.