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Fabrication of polyaniline–carbon nano composite for application in sensitive flexible acid sensor
서창욱,윤여준,김도훈,최수연,박원규,유진선,백병민,권석빈,양철민,송영현,윤대호,양우석 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.64 No.-
Many studies have been carried out on sensors for detecting hazardous chemicals. In this study, a sensorfor detecting the presence of acid was developed and evaluated. The sensor is composed of carbonmaterials and polyaniline, which is a conductive polymer. Various candidate carbon materials for thesensor were examined, including graphite, reduced graphene oxide (rGO), and graphene nanoplatelets(GNP). From characterization of carbon material-polyaniline and acid reaction test, it was confirmed thatthe GNP was the best carbon material for the acid sensor. For practical use, the GNP–polyanilinecomposite was coated on PET to enable aflexible sensor.
서창욱 대한영상의학회 1980 대한영상의학회지 Vol.16 No.2
Most pathologic conditions requiring emergent operation in neonate are congenital anomalies and delayed dianosis and associated anomaly are important factors which have contributed to the high mortality rate of congenital anomalies. To prevent this delay, early recognition of the danger signals, adequate roentagenologic examination and accurate diagnosis should be made. Furthermore radiologists should be aware of developing mechanism, clinical manifestations and roentgenographic findings of those neonatoal emergencies. 135 cases of neonatal emergencies were analized at this point of view, which verified by surgery and pathologic examination at Yonsei University College of Medicine, Severance Hospital since 1968. Embryology and characteristic roentgenographic pictures of each disease were discussed. The conclusions are as follow : 1. Most cases(110/135) presented intestinal obstruction . Imperforate anus(29 cases) was most common disease which followed by infantile hypertrophi pyloric stenosis 925 cases), small bowel stresia and stenosis (18 cases), congenital megacolon (15 cases) and esophageal atresia(14 cases). 2. Clinical Type and time of occurence of symptoms and signs were so characteristic that these were helpful for difference diagnosis. 3. In infantile hypertrophic pyloric stenosis, confirmative diagnosis could be made in plain abdominal film, when "Caterpillar sign" was seen. 4. When small bowel obstruction was suspected in plain abdominal film, barium eneam examination was more helpful than upper G-l study. When microcolon was found, lower small bowel obstruction was highly suggested. 5. Diagnosis of midgut malrotation was possible in larger cases(4/7). Upper G-l examination was more valuable than barium enema study, because duodenal obstruction due to Ladd's band was common problem in neonate. 6. In neonatal period, diagnosis could be made with the findings of barium study. 7. Imperforate anus and esophageal atresia had high incidence of asso iated anomalies and co-existency. So/skillful inspection should be made for discovery of those associated anomalies.anomalies.
스마트 단말에서의 이벤트 기반 스트리밍 콘텐츠 재생 시점 탐지 방법
나승재(Seung Jae Na),서창욱(Chang Wook Seo),김민철(Min Cheol Kim),이형우(Hyung-Woo Lee),정치윤(Chi Yoon Jeong),한승완(Seungwan Han) 한국컴퓨터정보학회 2015 한국컴퓨터정보학회 학술발표논문집 Vol.23 No.1
최근 청소년들의 스마트 단말 사용이 급격히 증가하면서, 스마트 단말을 통하여 유해 콘텐츠에 접근하는 비중이 점점 더 늘어나고 있다. 이에 본 논문에서는 스마트 단말에서 스트리밍 콘텐츠가 실행되는 메커니즘을 분석하고, 이를 기반으로 실행 이벤트의 연관성을 분석하여 스트리밍 콘텐츠가 재생되는 시점을 자동으로 탐지할 수 있는 방법을 제안하였다. 제안된 방법을 사용하면 스마트 단말에서 스트리밍 유해 콘텐츠를 효과적으로 차단 할 수 있을 것으로 기대된다.
안드로이드 단말에서의 실행 이벤트 특징 분석 기반 유해 콘텐츠 탐지 도구 개발
나승재(Seung Jae Na),서창욱(Chang Wook Seo),김민철(Min Cheol Kim),이형우(Hyung-Woo Lee),정치윤(Chi Yoon Jeong),한승완(Seungwan Han) 한국컴퓨터정보학회 2015 한국컴퓨터정보학회 학술발표논문집 Vol.23 No.1
최근 스마트 단말을 통한 유해 콘텐츠의 보급이 확산되면서 스마트 단말에서 유해 콘텐츠를 차단하기 위한 소프트웨어의 필요성이 증가하고 있다. 이에 본 논문에서는 안드로이드 기반 스마트 단말에서 실행 이벤트의 분석을 통하여 유해 콘텐츠를 탐지 할 수 있는 방법을 제안한다. 본 논문에서는 안드로이드기반 스마트 단말에서 스트리밍 서비스가 실행되는 구조 및 관련 실행 이벤트들의 연관성을 분석하였으며, 분석 결과를 토대로 스마트 단말에서 유해 콘텐츠의 실행 여부를 판단할 수 있는 소프트웨어를 개발하였다.