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1. 06㎛ Nd : YAG Laser를 이용한 요추간판탈출증의 경피적 수핵감압술
이흥선,변박장,최순관,신원한,권귀향,이인수,이경석,김범태 순천향대학교 1994 논문집 Vol.17 No.4
The 1.06㎛ Neodymium-YAG Laser(800 micron hemisherical) is revealed a useful tool for percutaneous laser disc decompression(PLDD). Especially PLDD would be applied to the management of lumbar disc herniation with minimal intervention. Total irradiated energy to one level of disc space was bout 1000 to 2000 joules. We performed this method at 10 levels, in 7 cases of patients, consisting of 4 males and 3 females with an average age of 37.7 years. Five cases showed excellent and good results, were observed. In two cases, open surgery was required because of unsatisfactory results. The best results were obtained in the protrusion type of disc herniation. We have summarized some advantages of PLDD: a) safe and simple procedure in an outpatient setting, b) avoiding general anesthesia, late spinal instability, c) possibility of repetitive use.
공기조화기 장착용 축상유입식 싸이클론의 압력손실에 대한 수치해석 및 실험적 연구
Soon-Bark Kwon,Duck-Shin Park,Youngmin Cho,Se-Young Kim,Myeoung-Joon Kim,Hojoong Kim,Taesung Kim 한국입자에어로졸학회 2009 Particle and Aerosol Research Vol.5 No.2
Particulate matter (PM) is one of the major indoor air pollutants especially in the subway station in Korea. In order to remove PM in the subway station, several kinds of PM removal system such as roll-filter, auto-washable air filter, demister, and electrostatic precipitator are used in the air handling unit (AHU) of subway stations. However, those systems are prone to operation and maintenance problems since the filter-regeneration unit consisting of electrical or water jet parts might malfunction due to the high load of particulates unless the filter medium is periodically replaced. In this study, the use of axial-flow cyclone was proposed for particulate filter unit in the AHU for its low operation and maintenance cost. Novel shape of axial-flow cyclone was designed by using computational fluid dynamics (CFD). The shape of vortex vane was optimized in terms of pressure drop and tangential velocity. In addition, CFD analysis was validated experimentally through the pressure drop measurement of mock-up model. We found that pressure drop and tangential velocity of fluid through the axia-flow cyclone was significantly affected by the rotating degree of vortex vane and the numerical prediction of pressure drop agreed well with experimental measurement.
권순박(Soon-Bark Kwon),김세영(Se-Young Kim),김명준(Myungjoon Kim),강중구(Joong-Goo Kang),신창헌(Chang-Heon Shin),김태성(Taesung Kim) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.11
Particulate matter (PM) is one of the major indoor air pollutants especially in the subway station in Korea. In order to remove PM in the subway station, several kinds of PM removal system such as roll-filter, auto-washable air filter, demister, and electrostatic precipitator are used in the air handling unit (AHU) of subway station. However, those systems are faced to operation and maintenance problems since the filter-regeneration unit consisting of electrical or water jet parts is malfunctioned due to the high load of particulates and the filter material needs periodic replacement. In this study, we presented the novel air filtration system utilizing cyclone panels for removing PM in AHU. The system was designed based on numerical simulation test in terms of particle collection efficiency and pressure drop. The mock-up model was manufactured for experimental test and the results showed good feasibility.
권순박(Soon Bark Kwon),조영민(Youngmin Cho),박덕신(Duck-Shin Park),박은영(Eun Young Park) 한국대기환경학회 2008 한국대기환경학회지 Vol.24 No.2
The guidelines for indoor air quality of public transportations such as subway, train and bus was presented by Korean Ministry of Environment last end of year 2006 based on the great consequence of indoor air quality in daily life. Two main parameters, carbon dioxide (CO₂) and particulate matters smaller than 10 ㎛(PM₁?), were selected as index pollutants for the management of indoor air quality. The former pollutant, CO₂, is regarded as index of ventilation status and the major source of CO₂ in the train or subway is the exhalation of passengers. It is publically perceived that the high CO₂ concentration in a crowded subway will be reduced and ventilated with outdoor air by door-opening taken every 2 or 3 minutes when the train stops each station. However, there has not been any scientific proof and quantitative information on the effect of door-opening on the CO₂ reduction by ventilation with outdoor air. In this study, CO₂ concentration and number of passengers were measured at each station on the 3 lines of Korail metropolitan subway. In order to evaluate the effect of CO₂ reduction by door opening, the theoretical approach using the CO₂ balance equation was performed. By comparing the predicted data with monitoring one, the optimum CO₂ dilution factor was determined. For the first time, it was quantified that about 35% of CO₂ concentration in the subway indoor was removed by the door-opening at each station.
권순박(Soon-Bark Kwon),김세영(Seyoung Kim),김명준(Myungjoon Kim),박덕신(Duck-Shin Park),정우태(Wootae Jeong),김태성(Taesung Kim) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
Management of indoor air quality of underground subway station is an important issue. The air handling unit (AHU) installed in the underground subway station is the main facility determining the air quality of station. Especially for removing particulate matters it is important to operate the appropriate air filter. In this study we studied particle collection efficiency of axail-flow cyclone for subway AHU. The particle collection efficiencies of axial-flow cyclones with three different outlet shape have been evaluated.
칸막이가 설치된 사무실 공간의 냉방효과에 관한 수치해석적 연구
권순박(Soon-Bark Kwon),박덕신(Duck-Shin Park),조영민(Young-Min Cho),박은영(Eun-Young Park) 한국실내환경학회 2006 한국실내환경학회지 Vol.3 No.4
Numerical simulation using computational fluid dynamics (CFD) was performed to calculate the predicted mean vote (PMV) based on velocity and temperature profiles of air in a partitioned office building. The office building (W:14.65 m, D:7.57 m, and H:2.63 m) was divided by partitions of 1.5 m height and shared by 7 office workers. Each person uses a personal computer and printer on a desk. One stand-type air conditioner was installed in the corner of the room and operated at the variable flow rate of 35 ㎥/min. In the case study, we assumed that the initial temperature of the room was 303 K and it was cooled down by operating air-conditioner. The outside temperature was fixed at 303 K and the heat flux through the windows was included in the calculation. Heat sources of personal computers, human bodies, fluorescent lamps, and refrigerator were considered. The temperature and PMV values were also calculated to asses the thermal comfort of each person by operating time of air conditioner. It was found that the thermal comfort could be improved by changing the angle of diffuser grill of air conditioner.