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에탄올이 초임계 이산화탄소를 이용한 폐 페인트 슬러지 처리에 미치는 영향 연구
하승일,박광헌,최창식,신재빈,손효경 한국대기환경학회 2021 한국대기환경학회 학술대회논문집 Vol.2021 No.10
자동차 제조 공정 중 도장공정 내 CWS (circulating water system)에서 수거되는 페인트 슬러지는 폐기물처리 시 많은 비용이 발생한다. 따라서 페인트 슬러지의 부피를 감량하여 처리 비용을 감축할 수 있는 추가적인 처리 공정이 요구된다. 따라서 본 연구에서는 2차 폐기물 발생을 줄일 수 있는 친환경적인 용매로써 초임계 이산화탄소를 이용한 페인트 슬러지 처리실험을 진행하였다. 이산화탄소는 무독성이며 물질에 대한 침투성이 좋아 높은 처리효율을 기대할 수 있으며, 이산화탄소와 같이 상온에서 기체인 유체는 공정 후 감압을 통하여 폐기물과 분리시켜 2차 폐기물 발생문제를 해결할 수 있다. 또한 분리된 이산화탄소를 재사용할 수 있으므로 공정비용 감소 효과도 기대할 수 있다. 본 연구에서는 초임계 이산화탄소를 이용한 처리공정을 통해 페인트 슬러지의 함수율 감소량과 유기물 제거 가능성을 실험하고, 에탄올의 첨가여부에 따른 처리효율 차이를 확인하였다. 실험에 쓰인 샘플은 자동차 제조업체에서 사용되는 페인트 슬러지를 사용하였으며, 페인트 슬러지의 성분 비율에 따라 클리어/ 상도베이스1 / 상도베이스2 총 3종류로 구분하였다. 실험 조건의 경우 샘플 질량을 5 g으로 통일하였고, 샘플이 담긴 반응용기에 이산화탄소를 주입하여 온도 40℃ 조건에서 200 bar로 가압하였다. 이후 평균 3.5mL/min의 유량으로 2시간 동안 이산화탄소를 흘림으로써 실험을 마무리하였다. 추가적으로 실험 조건에 에탄올을 첨가함으로써 에탄올이 처리 효율에 미치는 영향을 확인하였다. 실험 결과 유기물량에 비해 함수율의 감소 효과가 뚜렷하게 나타났으며, 에탄올의 첨가로 인한 수분 추출의 가속화를 확인하였다. 이를 통해 향후 공정 확대가 이루어진다면 이산화탄소 용매 재사용으로 인한 처리 비용 감소와 함께 효율 증대가 이루어질 것으로 기대된다.
하승인,김범석 한국인터넷전자상거래학회 2024 인터넷전자상거래연구 Vol.24 No.1
This study opening a new super store involves selecting an economically feasible location through screening candidate locations and estimating expected sales. Individuals or corprate businesses may have less access to sensitive information than large distribution companies, making it difficult to select an effective location. Accordingly, this study proposed a model that can predict sales of new super stores using easily accessible commercial district information. At this time, the model applied the broken-line regression method to dived the analysis object into two areas before/after the break-point, and separately estimated sales by fitting ridge regression to each area. Through this, it is expected that it will be possible to identify various relationships between sales and influencing factors. As a result of the analysis, a clear difference in relationship between the two areas appeared starting from the break-point, and the sales prediction accuracy through the regression model was also found to be at a good level.
내시경적 역행성 담관조영술 중에 발생한 식도천공에 의한 기흉 1예
하승인,김신,김유리,박찬복,이지현,윤병철,한병훈,이상욱,신동훈 고신대학교 의학부 2004 高神大學校 醫學部 論文集 Vol.19 No.1
Esophageal perforation is an extremely lethal injury that requires careful management for survival. Currently, the most common cause of the perforation is iatrogenic injury, and the incidence of esophageal perforation has increased as the use of endoscopic procedure has become more frequent. Perforation during endoscopic retrograde cholangiogram (ERC) are rare. Bile duct or duodenal perforation caused by therapeutic procedures such as endoscopic sphincterotomy, guide-wire, and biliary stent were frequently reported. However, the case of esophageal perforation developed during diagnostic ERC was very rare and there has not report in Korea yet. A 61-year-old man was admitted for the evaluation of upper abdominal pain. He suspected bile duct dilatation and common bile duct stone by ultrasongraphy. During the diagnostic ERC, endoscopy showed structure of pleural cavity. We suspected esophageal perforation, and then checked esophagogram, neck and chest CT. The CT showed right side pneumothorax and left parapharyngeal and retropharyngeal air shadow. We diagnosed esophageal perforation accompanied with pneumothorax. He was successfully treated with medical treatment for 10 days.
Gillies 씨 방법으로 정복된 독립 관골궁 골절의 장기 추적관찰
하승일,김준범,최재구,안덕균 大韓成形外科學會 1998 Archives of Plastic Surgery Vol.25 No.1
Many methods have been developed for the reduction of the isolated zygomatic arch fracture. Even though the reduction of isolated zygomatic arch fracture can be made well according to the various methods, the Gillies' method has been selected as the 1st choice. But long term follow-up study of this method was not reported. So long term follow up of zygomatic arch fracture was performed in 35 patients who were treated by Gillies' method. Authors divided isolated zygomatic arch fractures into three classes (Type A : a simple fracture with one fracture line and one greenstick fracture, TyPe B : medially depressed fracture with three fracture lines, Type C : a medially depressed fracture segment with two fracture lines) and followed up the reduced isolated zygomatic arch fracture cases using Gillies' method by radiographes and interview. The depression of lesion site was estimated by comparing with tracing the zygomatic arch shadow of normal side. The results were as follows: 1. The mean follow up time was 33.4 month. 2. The isolated zygomatic fractures were classified by three group. A: a simple fracture (16 cases) B: the central fracture point was a medially depressed fracture (14 cases) C: fracture with a medially depressed segment (5 cases) 3. The mean depression of lesion site was 2.3 mm. (Type A: 2.0 mm, Type B: 3.2 mm, Type C: 2.4 mm and difference between A and B was significant statistically (p < 0.037)). 4. The mean depression of zygomatic arch fracture was 2.1 mm in excellent group, 2.4 mm in good group and 5.2 mm in poor group and difference between excellent and poor, and between good and poor group were statistically significant (p < 0.0001). 5. On result of subjective satisfaction, number of excellent case was 17(48.6%), it of good case was 15(42.9%) and it of poor case was 3(8.6%) (Type A: 9, 7, 0, Type B: 5, 7, 2 and Type C: 3, 1, 1 excellent, good and poor in sequence). 6. The mean depression of overcorrection group(17, 8, 1 excellent good and poor in sequence) and nonovercorrection group(2, 5 and 2 in excellent, good and poor in sequence) was 2.26 and 3.6 mm in each other(p < 0.004). After reviewing all of results, it is concluded that Gillies' method is acceptable as the 1st choice for the reduction method of an isolated zygomatic arch.
내시경적 역행성 담관조영술 중에 발생한 식도천공에 의한 기흉 1예
하승인,김신,김유리,박찬복,이지현,윤병철,한병훈,이상욱,신동훈 고신대학교(의대) 고신대학교 의과대학 학술지 2004 고신대학교 의과대학 학술지 Vol.19 No.1
Esophageal perforation is an extremely lethal injury that requires careful management for survival. Currently, the most common cause of the perforation is iatrogenic injury, and the incidence of esophageal perforation has increased as the use of endoscopic procedure has become more frequent. Perforation during endoscopic retrograde cholangiogram (ERC) are rare. Bile duct or duodenal perforation caused by therapeutic procedures such as endoscopic sphincterotomy, guide-wire, and biliary stent were frequently reported. However, the case of esophageal perforation developed during diagnostic ERC was very rare and there has not report in Korea yet. A 61-year-old man was admitted for the evaluation of upper abdominal pain. He suspected bile duct dilatation and common bile duct stone by ultrasonography. During the diagnostic ERC, endoscopy showed structure of pleural cavity. We suspected esophageal perforation, and then checked retropharyngeal air shadow. We diagnosed esophageal perforation accompanied with pneumothorax. He was successfully treated with medical treatment for 10 days.
Kapok을 template로 이용하여 Porous 유-무기 하이브리드 구조체 합성
하승,여가경,박승규 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
나노과학 기술 발전으로 나노튜브에 대한 많은 연구가 이루어지고 있으며 튜브의 외부와 내부 벽에 생물학적 접근, 촉매 및 광학 장치의 기능적인 응용이 가능하다.하지만 가장 큰 문제점으로 제조에 있어서 높은 가격, 어려운 제조기술, 환경 파괴 문제를 지적 받고 있다. 본 연구에서는 값이 저렴하며 친환경 자연섬유인 Kapok을 template로 사용하였다. 카폭은 Kapok tree의 열매 속에서 생산되는 천연 섬유로 내부의 wax와 ligolinin층을 제거하면 hollow한 구조를 갖는다. Kapok의 수십 μm 크기의 mesopore를 MCM-48 micro tube 합성의 template로 활용하여 주형합성반응(Template synthesis method)를 수행 하였다. 생성된 MCM-48 micro tube를 SEM을 통하여 관찰한 결과 tamplate위에 결정이 균일하게 배열됨을 확인하였고 XRD를 통하여 구조적 특성을 확인하였다. 또한 생성된 MCM-48 micro tube를 이용하여 Ni흡착실험을 진행하였다.