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신도시 중산층 아파트 지역에서의 하수발생량 및 절수 홍보 효과
金應鎬,許順哲,趙珍奎,黃煥國 弘益大學校 科學技術硏究所 1996 科學技術硏究論文集 Vol.7 No.1
Both pattern of water use and pollutant load were investigated in the apartment area for the middle class of a new town. Especially the analysis of the effect of saving water under public information of saving water was used to search possible quantities of saving water. The results of this survey showed that each household had 3.84 persons with water use rate of 262 L/capitaㆍd on an average. The average domestic loading for COD, BOD, SS, T-N and T-P were 107.5, 49.5, 50.1, 7.7 and 1.6 g/capitaㆍd, respectively. Water used by residential households consists of water for washing clothes, toilets, bath, showers, kitchen, washing up and sweeping. Among above sources toilet water (26%) occupied the largest component of residential water use. Also the reduction of total water use was 12.3% by public information of saving water.
Polyimide계 배향막의 합성과 그 입체구조가 액정분자의 프리틸트 각에 미치는 영향
김재창,이상진,허노성,권덕용,이진국 釜山大學校生産技術硏究所 1997 生産技術硏究所論文集 Vol.53 No.-
Polyimide계 배향막은 고온처리 등 디스플레이 제조공정을 거치면서도 액정 배향특성이 유지되며 장시간 사용에도 물리·화학적 안정성이 좋은 장점을 가지고 있어 널리 사용되고 있다. 이 배향막을 연구하는데 있어서 합성기술과 러빙처리에 따른 배향막 표면의 특성분석이 필수적이며, 본 연구에서는 Diamine과 Dianhydride를 NMP용매하에서 용액중합하여 polyamic acid를 합성한 후, ITO코팅된 유리표면위에 스핀개스팅하여 박막을 입히고 열적처리를 하여 이미드화시켰다. 배향막의 배향을 위해서 러빙처리를 하고, 러빙처리 전후의 접촉각 측정을 통한 배향막 표면장력변화를 harmonic-mean 방법으로 구했고 2차 고조파 신호 (SHG) 분석을 통한 배향막 표면분자들의 방향성 분포를 검토해 보았다. Polyimide의 반복단위구조를 컴퓨터 그래픽 프로그램 (CS Chem3D Pro)을 사용하여 3차원적으로 시뮬레이션함으로서 polyimide의 입체구조를 알아보았다. 그리고 그 입체구조와 프리틸트 각과의 상관관계를 분자간 상호 작용설을 근거로 하여 살펴보았다. Polyimide has been widely used as the alignment film for liquid crystal displays because of their excellent properties, such as thermal can chemical stability. In this experiment, polyamic acid is rapidly formed at ambient temperatures when a diamine and a dianhydride are added into NMP. Polyimide films were fabricated by spin-coating solution on ITO-coated glass substrates. Polyimide films were baked at 80oC and then cured at 150oC 250oC for 30min at each temperature. The polyimide-coated substrates were rubbed by a rubbing machine with a roller. We measured the contact angles and the second-harmonic signals on the surface of samples to know the surface tension and the surface orientation of samples. and We also measured the pretilt angle of liquid crystal molecules in order to find the effect of the rubbing strength and the steric structure of polyimides on it.
조관 및 시편 가공 영향을 고려한 강관의 균일 물성 평가기술 개발
허서진 ( Heo¸ Seo-jin ),김동원 ( Kim¸ Dong-won ),강수창 ( Kang¸ Soo-chang ),김진국 ( Kim¸ Jin-kook ) 한국구조물진단유지관리공학회 2023 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.27 No.2
이 연구는 조관 후 원형 강관에서 시편을 채취하는 과정 절단기 등에 의한 열 영향, 편평화 방법, 두께-직경 비(1/D)를 변수로 인장시험 및 유한요소해석을 수행함으로써 시편 채취 및 가공 과정 각 물성 변화 인자의 영향 분석을 기반으로 강관의 균일화된 물성 확보를 위한 시험 및 평가법 제안을 목표로 한다. 향후 소재, 강관, 강관에서 채취한 시편의 단계별 물성의 상관관계를 분석함으로써 원형 강관의 제작과정 및 시험조건을 고려한 강관의 구조성능 예측 모델을 개발하고자 한다.
Case Reports : A case of pedunculated hepatic hemangioma mimicking submucosal tumor of the stomach
( Han Kook Moon ),( Hyoung Su Kim ),( Gyeong Mi Heo ),( Woon Geon Shin ),( Kyung Ho Kim ),( Myoung Kuk Jang ),( Jin Heon Lee ),( Hak Yang Kim ),( Doo Jin Kim ),( Seong Jin Cho ) 대한간학회 2011 Clinical and Molecular Hepatology(대한간학회지) Vol.17 No.1
Hepatic hemangioma is the most common benign tumor of the liver. Most such hemangiomas are small, asymptomatic, and have an excellent prognosis. Giant hepatic hemangioma has been reported in the literature, but the exophytic and pedunculated forms of hepatic hemangioma are rare. A 56-year-old woman was referred to our hospital under the suspicion of having a gastric submucosal tumor. Abdominal computer tomography (CT) scans showed a pedunculated mass from the left lateral segment of the liver into the gastric fundus, exhibiting the atypical CT findings of hepatic hemangioma. We therefore decided to perform laparoscopic resection based on the symptoms, relatively large diameter, inability to exclude malignancy, and risk of rupture of the exophytic lesion. The pathology indicated it to be a cavernous hemangioma of the liver. Herein we report a case of pedunculated hepatic hemangioma mimicking a submucosal tumor of the stomach due to extrinsic compression of the gastric fundus.
Reflective color display using thermochromic pigments
Heo, Kyong Chan,Sohn, Youngku,Yi, Jonghoon,Kwon, Jin Hyuk,Son, Phil Kook,Gwag, Jin Seog The Optical Society 2012 Applied Optics Vol.51 No.18
<P>A reflective thermochromic display fabricated by a very simple method using three kinds of thermochromic pigments is produced and its thermo-optical characteristics are investigated. The display exhibits maximum red, green, and blue reflectances of 38%, 30%, and 35%, respectively. The reflective display cell shows continuous gray color with changing temperature, which is crucial for multicolor displays. It also shows an excellent viewing angle above 80° without any of the additional optical components that are required in liquid crystal displays. We expect that this display technology will be used for outdoor billboard information display applications.</P>