강유전체 박막 커패시터 하부전극에 관한 연구

임동건,정세민,최유신,김도영,이준신 성균관대학교 1997 학술회의지원논문목록집 Vol.1997 No.-

We have investigated Pt and RuO₂as a bottom electrode for a device application of PZT thin film. The bottom electrodes were prepared by using an RF magnetron sputtering method. We studied some of the property influencing factors such as substrate temperature, gas flow ratem and RF power. An oxygen partial pressure from 0 to 50% was investigated. The results show that only Ru metal was grown without supplying any ‬O₂gas. Both Ru and RuO₂phases were formed for ‬O₂partial pressure between 10-40%. A pure RuO₂phasewas obtained with ‬O₂partial pressure of 50%. A substrate temperature from room temperature to 400°C was investigated with XRD for the film crystallinity examination. The substrate temperature influenced the surface morphology and the resistivity of Pt and RuO₂ as well as the film crystal structure. From the various considerations, we recommend the substrate temperature of 300°C for the bottom electrode growth. Because PZT film growth on top of bottom electrode requires a temperature process higher than 500°C, bottom electrode properties were investigated as a functiona of post anneal temperature. As post anneal temperature was increasedm the resistibity of Pt and RuO₂was decreased. However, almost no change was observed in resistibity for an anneal temperature higher than 700°C . From the studies on resistivity and surface morphology, we recommend a post anneal temperature less than 600°C.

A-Si:H/Cd 계면층을 이용한 a-Si:H의 결정화 연구

김도영,최유신,임동건,이준신,김홍우,이수홍 성균관대학교 1997 학술회의지원논문목록집 Vol.1997 No.-

We studied the crystallization of a-SiH thin film. Multi crystallized Si fillms are preferred in many applications such as FPD, solar cells, RAM, and integrated circuits. Because most of these applications require a low temperature process, we investigated a crystallization of a-SiH using a Cd layer. A metal Cd shows an eutectic point at a temperature of 321°C. THis paper present Cd layer assisted crystallization of a-SiH film for the various grain growth parameters such as anneal temperature. Cd layer thickness and anneal time.

동종 조혈모세포이식 후 발생한 크립토콕쿠스 척추염 1예

고윤호,임동준,이성수,조유경,이동건,최정현,김유진,민창기,김동욱,박정미,김춘추,신완식 대한감염학회 2001 감염 Vol.33 No.4

Skeletal cryptococcosis is an uncommon infection. Cryptococcus is a common cause of meningitis and infects 7∼10% of patients with AIDS. As well as AIDS, the infection may be seen in association with leukemia, lymphoma, Hodgkin's disease, sarcoidosis, tuberculosis and diabetes, also in patients on steroid medication. But there is no case report of skeletal cryptococcosis following allogeneic hematopoietic stem cell transplantation. A 40-year-old woman was admitted to the hospital because of low back pain. She had chronic myelogenous leukemia for 2 years and underwent allogeneic hematopoietic stem cell transplantation 8 months ago. She have been treated with steroid and cyclosporine orally because of chronic graft versus host disease. On examination she was afebrile and had posterior lower lumbar tenderness. But, she had no reduced strength of low extremities. Open biopsy was underwent. Histology demonstrated budding, round-to-oval, refractile yeast-like organisms within debris. The results of a lumbar puncture were unremarkable and cerebrospinal fluid culture failed to grow bacteria and yeast. The patient was treated with amphotericin B (1 gram) and AmBisome□ (2.8 gram) over 6 weeks. Three months after cessation of therapy, the patient was doing well.(Korean J Infect Dis 33:298∼301, 2001)

운동유발성 아나필락시스 환자에서 혈 중 tryptase 측정 1례

예영민,임선교,서유진,최정희,서창희,남동호,박해심 대한천식 및 알레르기학회 2004 천식 및 알레르기 Vol.24 No.1

Exercise-induced anaphylaxis(EIA) is a medical emergency in that it derives from a physical allergy. We reported a case of food-independent EIA based on history and laboratory data. A 40-year-old male patient was presented with generalized urticaria, angioedema, and syncope after jogging. He had suffered from allergic rhinitis for 25 years. Increased level of serum tryptase was noted. Mast cell activation might be suggested in the pathophysiologic mechanism of EIA. (J Asthma Allergy Clin Immunol 24 : 152-5, 2004)

Stent삽입을 이용한 관동맥성형술로 치료한 내장역위가 동반된 우심증의 급성 심근경색증환자 1예

황경화,김태용,김준영,최유정,최홍엽,오재인,임상욱,차동훈 대한순환기학회 1999 Korean Circulation Journal Vol.29 No.9

Two cases of female hydrocele of the canal of nuck

Choi, Yu-Mi,Lee, Gyu-Min,Yi, Jung-Bin,Yoon, Kyung-Lim,Shim, Kye-Shik,Bae, Chong-Woo,Choi, Sung-Il,Kim, Hyun-Cheol The Korean Pediatric Society 2012 Clinical and Experimental Pediatrics (CEP) Vol.55 No.4

The processus vaginalis within the inguinal canal forms the canal of Nuck, which is a homolog of the processus vaginalis in women. Incomplete obliteration of the processus vaginalis causes indirect inguinal hernia or hydrocele of the canal of Nuck, a very rare condition in women. Here, we report 2 cases of hydrocele of the canal of Nuck that were diagnosed with ultrasonography in both cases and magnetic resonance imaging in 1 case to confirm the sonographic diagnosis. High ligation and hydrocelectomy were conducted in both patients. In 1 patient, 14 months later, the occurrence of contralateral inguinal hernia was suspected, but did not require surgery. The other patient had a history of surgery for left inguinal hernia 11 months before the occurrence of right hydrocele of the canal of Nuck. In both cases, the occurrence of an inguinal hernia on the contralateral side was noted.

Performance Analysis of the First Korean Satellite Laser Ranging System

Choi, Man-Soo,Lim, Hyung-Chul,Choi, Eun-Jung,Park, Eunseo,Yu, Sung-Yeol,Bang, Seong-Cheol,Kim, Tae-Keun,Kim, Young-Rok,Kim, Dong-Jin,Seong, Kipyung,Ka, Neung-Hyun,Choi, Cer-Hee,Hwang, Joo-Yeon,Kuchars The Korean Space Science Society 2014 Journal of Astronomy and Space Sciences Vol.31 No.3

The first Korean satellite laser ranging (SLR) system, Daedeok SLR station (DAEK station) was developed by Korea Astronomy and Space Science Institute (KASI) in 2012, whose main objectives are space geodesy researches. In consequence, Korea became the $25^{th}$ country that operates SLR system supplementing the international laser tracking network. The DAEK station is designed to be capable of 2 kHz laser ranging with precision of a few mm both in daytime and nighttime observation of satellites with laser retro-reflector array (LRA) up to the altitude of 25,000 km. In this study, characteristics and specifications of DAEK station are investigated and its data quality is evaluated and compared with International Laser Ranging Service (ILRS) stations in terms of single-shot ranging precision. The analysis results demonstrated that the DAEK station shows good ranging performance to a few mm precision. Currently, the DAEK station is under normal operations at KASI headquarters, however, it will be moved to Sejong city in 2014 to function as a fundamental station for space geodesy researches in combination with other space geodesy systems (GNSS, VLBI, DORIS, etc.).

철 나노 입자가 담지된 바이오차 기반 비드 형태 안정화제를 이용한 비소 및 납 오염토양의 안정화

최유림 ( Yu-lim Choi ),김동수 ( Dong-su Kim ),강태준 ( Tae-jun Kang ),양재규 ( Jae-kyu Yang ),장윤영 ( Yoon-young Chang ) 한국환경영향평가학회 2021 환경영향평가 Vol.30 No.4

본 연구에서는 기존 바이오차의 제한점인 비소 오염 토양 안정화에 대한 낮은 효율과 비산에 의한 유실 가능성을 개선할 수 있는 철 나노입자가 담지된 바이오차 기반 비드 형태 안정화제인 INPBC/bead (Iron Nano-Particles Impregnated BioChar/bead)를 제조하였다. 폐목재 바이오매스를 Fe(III) 용액과 함께 수열 반응을 진행하고 이후 소성을 거쳐 INPBC를 제조하였다. INPBC/bead는 알지네이트의 crosslinking 반응을 통해 제조 하였다. 제조한 INPBC/bead의 특성을 평가하기 위해 FT-IR, XRD, BET 비표면적, SEM-EDS 분석을 실시하였다. 특성 평가 결과 입자 크기가 1-4 mm인 INPBC/bead는 여러 산소 함유 관능기를 보유하며 표면의 철 결정성은 Fe₃O₄인 것으로 확인되었다. INPBC/bead의 성능을 평가하기 위해 폐광산 주변 지역에서 채취한 비소 및 중금속 오염 토양을 이용하여 배양 실험을 실시하였다. 4주 동안의 배양이 종료된 후 처리된 토양을 대상으로 TCLP, SPLP 시험을 실시한 결과 안정화제 적용 비율이 증가함에 따라 안정화 효율은 높아지는 것으로 확인되었다. SPLP 시험 결과, INPBC/bead 5%의 비소 안정화 효율은 81.56%이며 납의 경우에는 농도가 검출한계 미만으로 저감되었다. 상기의 결과를 종합하였을 때 INPBC/bead는 토양 중 비소와 납에 대한 안정화 효과를 동시에 보유하고 토양의 pH 변화를 일으키지 않으며 비드 형태로써 적용 과정에서 비산되는 것이 방지할 수 있는 안정화제이기 때문에 비소 및 중금속 복합 오염 토양 안정화에 적용 가능성이 높은 안정화제 인 것으로 판단된다. In this work, Iron Nano-Particles Impregnated BioChar/bead (INPBC/bead) soil amendment was developed to increase biochar’s reactivity to As in soil and preventing possible wind loss. Prior to preparation of INPBC/bead, INPBC was produced utilizing lignocellulosic biomass and Fe(Ⅲ) solution in a hydrothermal method, followed by a calcination process. Then, the bead type amendment, INPBC/bead was produced by cross-linking reaction of alginate with INPBC. FT-IR, XRD, BET, and SEM-EDS analyses were utilized to characterize the as-synthesised materials. The particle size range of INPBC/bead was 1-4 mm, and different oxygen-containing functional groups and Fe₃O₄ crystalline phase were produced on the surface of INPBC/bead, according to the characterization results. The soil cultivation test was carried out in order to assess the stabilization performance of INPBC/bead utilizing As and Pb-contaminated soil obtained from an abandoned mining location in South Korea. After 4 weeks of culture, TCLP and SPLP extraction tests were performed to assess the stabilization efficacy of the amendment. The TCLP and SPLP findings revealed that raising the application ratio improved stabilizing efficiency. The As stabilization efficiency was determined to be 81.56 % based on SPLP test findings for a 5% in (w/w) INPBC/bead treatment, and the content of Pb in extracts was reduced to the limit of detection. According to the findings of this study, INPBC/bead that can maintain pH of origin soil and minimize wind loss might be a potential amendment for soil polluted with As and heavy metals.

회귀식에 의한 주암호 유입하천 유달율 추정

최유진 ( Yu Jin Choi ),최동호 ( Dong Ho Choi ),정재운 ( Jae Woon Jung ),윤광식 ( Kwang Sik Yoon ),정주홍 ( Ju Hong Jeong ),임병진 ( Byung Jin Lim ),강재홍 ( Jae Hong Kang ) 한국물환경학회(구 한국수질보전학회) 2011 한국물환경학회·대한상하수도학회 공동 춘계학술발표회 Vol.2011 No.-

주니어 공학 팀 미션 프로젝트 교육프로그램 및 교재 개발과 적용 효과

최유현(Yu Hyun Choi),박기문(Ki Moon Park),임윤진(Yun Jin Lim),임병웅(Byeong Ung Lim) 한국공학교육학회 2011 공학교육연구 Vol.14 No.3

The purpose of this study is to develop the ‘Engineering Team Mission Project Education Program and Textbook’, which is improved creativity and creative problem for Juniors(middle school students) that is in the growth stage to become the leading role in future society. This can be applied the creative experience activities time of revised curriculum in 2009 being implemented to secondary education by 2011. The results of this study are as follows. The formation of Team Mission Project Education Program is the big field 2 project, lower field 8 module and 38 total lessons. This education program has secured the validity of the SME(Subject Matter Expert) expert conference. Actually, by putting the education program and textbook to the invention talent class formed by middle school students and by normally analyzing, it has been analyzed as very satisfying result. Therefore, the 󰡔Engineering Team Mission Project Education Program and Textbook󰡕 can be provided as a practical education course of new talent training and engineering talent model of the nation s knowledge property education. And it can perform as an education program using usefully in the creative experience activity education course in middle class education stage. Also, it is concluded to become the basis of engineering design education s high grade education and department of engineering s creative engineering.