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3D Transformation Based on Membrane-Type Electronic Devices and Supportive Plastic Frameworks
Heung Cho Ko(고흥조) 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
This presentation deals with a means of transforming membrane-type electronic devices into desirable three-dimensional shapes in mild and stable manners. The strategy begins with creating printable thin structure of electronic devices and supportive plastic (ABS copolymer used in this study) framework separately and lamination process. ABS framework serves as a mechanical supporter and undergoes plasticization and transformation by thermal annealing or plasticizer. The optical, mechanical, and electrical analysis show that plasticization releases stress concentration on the device layer, frazile area in perticular, and allows 3D transformation without electrical failure. Finally, some examples of 3D electronic devices such as image sensor arrays, LED displays, IGZO transistors developed using this method will be demonstrated.
고흥,Ko, Heung 대한한방내과학회 1999 大韓韓方內科學會誌 Vol.20 No.1
Cheung-Gan-Haeju tang has been used on 3 cases of alcoholic liver disease patients complicated with ascites, clinical symptom(fatigue. jaundice, urine dark, indigestion, anorexia. ascites etc), liver function (AST, ALT, ${\gamma}$-GT, ALP, total bilirubin), and index of nutritional state (total protein, albumin, cholesterol) were improved after the adminstration. Although the exact mechanism involved in the effects of Cheung-Gan-haeju tang on these disease is still unknown, it is possibly suspected that Cheung-Gan-Haeju tang is non-toxic to liver and has beneficial effects on treating alcoholic liver disease complicated ascites. Further reports with many case, however, will be needed.
한방병원의 건강검진 분석을 통한 대학생들의 B형간염 유병률과 간효소 이상의 유병률 특성
고흥,김기태,신선미,Ko, Heung,Kim, Ki-tae,Shin, Seon-mi 대한한방내과학회 2015 大韓韓方內科學會誌 Vol.36 No.4
Objectives: Given current vaccinations against the hepatitis B virus and changes in dietary lifestyles, the status of liver disorders, especially in the younger population, is different than it was in the past. This study aimed to discover the prevalence of the HBsAg positive and abnormal hepatic enzyme among college students.Methods: The study analyzed the medical examinations of 2,646 college students that were performed at Semyung University from March to September 2013.Results: A total of 11 out of 2,646 students (0.4%) showed as positive for the hepatitis B antigen, while 23.8% of students had the serum HBs antibody. A total of 212 students (8.0%) showed abnormally elevated serum levels of ALT, with significant differences between men and women. The prevalence of the abnormal serum ALT and its average value significantly increased according to an increase of BMI score, especially in male students.Conclusions: This study showed the importance of obesity as a causative factor in liver disorders, especially in the young generation. This finding will be useful for the development of therapeutics using Korean medicine in the future.
고방열 재료 개발을 위한 에폭시/단일벽 탄소나노튜브 복합체 개발
김현일 ( Hyeonil Kim ),고흥조 ( Heung Cho Ko ),유남호 ( Nam-ho You ) 한국복합재료학회 2020 Composites research Vol.33 No.1
지난 10년간 효율적인 방열 재료 개발을 위해 유망한 매트릭스로서 액정 에폭시 수지(Liquid crystalline epoxy, LCER)는 많은 주목을 받아 왔다. 본 연구에서는 LECR중에서 대표적인 4,4-diglycidyloxybiphenyl (DP) 에폭시를 이용한 고분자/SWCNT 복합체의 합성과 제조 및 특성 분석을 포함한 포괄적 인 연구를 제시한다. 복합 재료의 열전도 특성을 확인해보기 위해 에폭시 수지와 충전제인 단일벽 탄소나노튜브(Single-wall carbon nanotube, SWCNT)로 구성된 복합체 샘플이 준비되었다. 특히 DP 복합체는, LCER의 고도로 정렬 된 미세 구조로 인해 동일한 필러를 사용하는 상업용 에폭시의 복합체에 비해 높은 열 전도성을 보였다. 또한, DP 복합체의 열전도도는 충전제의 양을 조절하여 제어할 수 있으며, 특히 SWCNT의 함량이 50 wt%인 DP 복합체는 열전도도는 2.008 W/mK로 가장 높은 열전도도를 나타내었다. Over the past decade, liquid crystalline epoxy (LCER) has attracted much attention as a promising matrix for the development of efficient heat dissipation materials. This study presents a comprehensive study including synthesis, preparation and chacterization of polymer/inorganic composites using typical 4,4-diglycidyloxybiphenyl (DP) epoxy among LECR. To confirm the thermal conductivity of composite materials, we have prepared composite samples composed of epoxy resin and single-wall carbon nanotube (SWCNT) as a filler. In particular, DP composites exhibit higher thermal conductivity than commercial epoxy composites that use the same type of filler due to the highly ordered microstructure of the LCER. In addition, the thermal conductivity of the DP composite can be controlled by controlling the amount of filler. In particular, the DP composite containing a SWCNT content of 50 wt% has the highest thermal conductivity of 2.008 W/mK.