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선회유동장치에서 익형 베인이 유동특성 및 선회성능에 미치는 영향
임준수(Joon-Soo Lim),최석민(Seok Min Choi),이용문(Young Mun Lee),이남규(Namkyu Lee),김풍일(Poongil Kim),조형희(Hyung Hee Cho) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
Flow separation, which generates at back side of vane in axial cyclone causes increasement of pressure drop and deteriorates collection efficiency of particle which should be avoided for thermal efficiency of plant and environmental problem. On this research, axial cyclone is studied for enhancing swirling performance for collection efficiency by applying curved vane. Numerical method was performed by Ansys Fluent 17.2. On the results, average swirl number is increased when vane angle of flat and curved vane is same.
초음파 가진이 과냉각 조건에서 풀 비등 열전달 및 기포 거동에 미치는 영향
임준수(Joon-Soo Lim),이동휘(Donghwi Lee),심동일(Dong Il Shim),이남규(Namkyu Lee),조형희(Hyung Hee Cho) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
The experimental study is to find out the effect of ultrasonic vibration on heat transfer and bubble dynamics in pool boiling. Sub-cooling condition (△T<SUB>sub</SUB>= 20℃) was applied. By using integrated chip with ITO (Indium tin oxide) heater and RTD (Resistance temperature detector) sensor, Surface temperature is acquisited when ultrasonic vibration is on working fluid. Heat transfer coefficient and heat flux are acquired from data reduction. Visualization of bubble dynamics is realized by using high speed camera. As a result, maximum heat transfer coefficient is increased 10% at most with ultrasonic vibration. We demonstrate the boiling heat transfer enhancement by applying ultrasonic vibration based on the results comparing the bubble departure size and bubble departure frequency.
배열회수보일러 후단 축류형 싸이클론 집진기의 원추형 가이드를 통한 유동 및 입자 포집 성능의 향상
임준수(Joon-Soo Lim),최승영(Seungyeong Choi),장인중(Injoong Chang),남주영(Juyeong Nam),김풍일(Poongil Kim),조형희(Hyung Hee Cho) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Axial cyclone was designed to collect iron oxide rear the heat recovery steam generator. In this study, we used the numerical method to estimate the fluid characteristics and particle dynamics in axial cyclone with conical tube which enhanced the swirl flow for higher collection efficiency. As a result, particle density increased near the wall which to particle absorbed and swirl number increased.
주사 환자의 임상적 고찰 및 주사의 진단 분류 체계의 비교에 대한 연구
임준수 ( Joon Soo Lim ),권은선 ( Eun Sun Kwon ),명기범 ( Ki Bum Myung ),정승현 ( Seung Hyun Cheong ) 대한피부과학회 2021 대한피부과학회지 Vol.59 No.8
Background: Rosacea is a common chronic inflammatory skin disease, which primarily affects the central face. In 2002, the National Rosacea Society (NRS) committee developed the first diagnostic criteria for rosacea, based on its subtypes. The revised classification in 2017 prompted a proposal to transit from a subtyping to a phenotyping approach, reflecting current insights into rosacea pathogenesis, pathophysiology, and management. Objective: This study aimed to elucidate the clinical features of rosacea and compare two diagnostic criteria in rosacea patients. Methods: We performed a clinical study on 100 patients with rosacea diagnosed according to the 2002 NRS criteria. The age, sex, clinical features, subtypes, severity, and predisposing factors were evaluated using the questionnaire. In addition, we compared the 2002 and 2017 criteria, and evaluated patients if they met the revised criteria. Results: According to the 2002 NRS classification, the erythematotelangiectatic type (88.0%) was the most frequent, followed by the papulopustular (43.0%), ocular (13.0%), and phymatous (6.0%) types. There were 44 overlapping cases, including 38 cases with 2 subtypes mixed and 6 cases with three subtypes. Six patients were diagnosed with rosacea using the 2002 NRS criteria but they did not satisfy the revised 2017 criteria. Conclusion: We found that the diagnostic features of the 2002 criteria are too ambiguous for the diagnosis of rosacea. Therefore, we recommend that dermatologists recognize the necessity of a transition from a subtyping to a phenotyping approach, according to the 2017 criteria for the diagnosis of rosacea. (Korean J Dermatol 2021;59(8): 624∼633)