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유승민,유승연,김민희,윤영희,최인화,Yu, Seung-Min,Yoo, Seung-Yeon,Kim, Min-Hee,Yun, Young-Hee,Choi, In-Hwa 대한한방안이비인후피부과학회 2011 한방안이비인후피부과학회지 Vol.24 No.3
Background : There are findings indicating that the autonomic nervous system (ANS) is affected negatively in atopic dermatitis (AD). Heart rate variability (HRV) is a tool to examine ANS. But, studies investigation the relationship between AD and HRV is rare. Objective : The aim of this study was to investigate the correlation between atopic dermatitis severity and HRV and to find out the role of ANS in AD. Methods : Retrospective chart review was performed. The Severity Scoring Atopic Dermatitis (SCORAD) index and HRV parameter was investigated and analyzed. Results : There were 55 patients (25males and 30 females) who met the criteria. Objective SCORAD had significant positive correlation with HRT and Subjective SCORAD had significant negative correlation with SDNN, TP and VLF. Intensity item of SCORAD index had negative correlation with most HRV parameters, but TP, LF and LF/HF ratio had significant positive correlation with dryness. Conclusion : This study supports the concept that atopic dermatitis is a stress-responsive disorder and involves autonomic nervous system dysfunction.
유승민 ( Seung Min Ryu ),유승열 ( Seung Ryul Yoo ),박준석 ( Jun Seuk Park ),홍은정 ( Eun Jung Hong ),노태협 ( Tai Hyeop Lho ) 한국물환경학회 2013 한국물환경학회지 Vol.29 No.5
Chloroform is harmful volatile organics and representatives of Trihalomethane (THM). Well-known removal methods of Chloroform are photo oxidation or OH radical oxidation. Plasma on water surface at slightly vacuum condition (45 torr) can produce OH radical and it will help chloroform removal. 81.5% of chloroform is removed by vacuum and plasma in 10 min. Plasma can totally oxidize it till 2.8% and partially oxidize chloroform up to 18.5%. Water-surface plasma is good method to remove chloroform in short time.
유승민(Seung-Min Yoo),채상훈(Sang-Hoon Chai) 한국정보기술학회 2021 한국정보기술학회논문지 Vol.19 No.3
A Doppler radar type sensor that uses a 10.525GHz microwave signal for motion detection is difficult to detect objects in a wide angular range because the angle of the transmitted beam is narrow when a single antenna is used. In order to solve this problem, the transceiver antenna, which is a component of the Doppler radar, is configured in the form of a multi-beam by combining several antennas having different phases, thereby realizing the object motion detection capability of a wide angle. The Doppler radar sensor fabricated by this study is composed of a multi-beam by combining four transmission/reception antennas with different phases to construct an array-type wide-angle motion sensor module with a detection function of 90° or more. In addition, by arranging three modules at 50° intervals, a wide-angle motion sensor with a detection angle of 180° or more could be implemented.