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Wi, Jae-Hyung,Han, Won Seok,Lee, Woo-Jung,Cho, Dae-Hyung,Yu, Hye-Jung,Kim, Chae-Woong,Jeong, Chaehwan,Yun, Jae Ho,Kim, Chang-Il,Chung, Yong-Duck IEEE 2018 IEEE journal of photovoltaics Vol.8 No.3
<P>Thin-film multijunction solar cells are considered to be the most promising structure for next-generation photovoltaic devices. We fabricated CuGaSe<SUB>2</SUB> (CGS)/Cu(In,Ga)Se<SUB>2</SUB> (CIGS) monolithic tandem solar cells. The intermediate AZO film was used as a recombination layer between the top cell and the bottom cell, and its thickness was varied from 50 to 200 nm. The best tandem cell parameters with a 50 nm thick Al-doped ZnO (AZO) layer showed a <I>V</I><SUB>OC</SUB> = 1.03 V, <I>J</I><SUB>SC</SUB> = 10.24 mA/cm<SUP>2</SUP>, <I>FF</I> = 41.5%, and <I>efficiency</I> = 4.32%. We showed the <I>V</I><SUB>OC</SUB> of monolithic tandem cell to be over 1 V under illumination. We also observed the current continuity between the CGS cell and the CIGS cell which were connected in series as subcells. As the AZO thickness increased, the spectral response of the top cell decreased and the bottom cell was not completely saturated. The 50 nm thick AZO layer leads the CIGS bottom cell to be current-limiting, whereas the 200 nm thick AZO layer shifts the limitation to the CGS top cell. The results also showed that the In element diffusion into the CGS top absorber enhanced the electrical and optical properties of the top cell, whereas the Zn element diffusion into CIGS bottom absorber tended to degrade the bottom cell simultaneously.</P>
FRP 선박 외판재의 연삭마모 특성에 관한 상대재 거칠기의 영향
김형진(HYUNG JIN KIM),고성위(SUNG WI KOH),김재동(JAE DONG KIM) 한국해양공학회 2008 韓國海洋工學會誌 Vol.22 No.6
The effect of counterpart roughness on abrasive wear characteristics of side plate materials of FRP ship, which were composed of glass fiber and unsaturated polyester resin composites, were investigated at ambient temperature by pin-on-disc friction test. The friction coefficient, wear rate and cumulative wear volume of these materials against SiC abrasive paper were determined experimentally. The wear rate of these materials decreased rapidly with sliding distance and then maintained a constant value. It was increased as counterpart roughness was rougher in a wear test. The cumulative wear volume tended to increase nonlinearly with sliding distance and depended on applied load and sliding speed for these composites. It could be verified by SEM photograph of fracture surface that major failure mechanisms were overlapping layers, microcutting, deformation of resin, delamination, and cracking.
2012년 한국백내장굴절수술학회 및 대한안과학회 회원 설문 조사
위재민(Jae Min Wi),문호석(Ho Seok Moon),김균형(Kyun Hyung Kim),신경환(Kyung Hwan Shyn) 대한안과학회 2015 대한안과학회지 Vol.56 No.8
목적: 국내 백내장 수술의 최근 경향과 그간의 변화를 알아보기 위해 1995년 이래 열여섯 번째로 설문 조사를 시행하였다. 대상과 방법: 한국 백내장굴절수술학회 회원 및 안과학회 회원 301명을 대상으로 총 108 문항의 제16차 설문 조사를 2013년 7월 실시하여 20.6%의 응답률을 얻었고, 2006년, 2009년에 시행된 기존 설문 조사와 비교하였다. 결과: 응답자의 연령은 30대가 46%로 가장 많았고 40대 43%, 50대가 10%였다. 백내장 수술의 입원 기간은 점점 감소하여 당일 퇴원이 보편화되었다. 마취방법은 점안마취가 69%로 가장 많은 비율을 차지하였고, 절개창의 무봉합법은 72%에서 시행되었다. 백내장 수술 시 사용하는 인공수정체의 광학부 재질은 소수성 아크릴(acrylic)이 76%로 가장 많았으며 지속적인 증가 추세에 있었다. 유수정체용 인공수정체 삽입술은 41%의 회원이 시행 중이었으며, 노안 교정인공수정체, 난시교정 인공수정체 등 특수 인공수정체에 대한 관심은 예전과 비교하여 지속적인 증가 추세에 있음을 알 수 있었다. 이 외에도 백내장 수술 후의 난시 발생을 최소화하기 위해 난시 정도에 따라 다양한 방법들이 시도되고 있었다. 하지만 Femtosecond laser cataract surgery 등 새로운 백내장 수술 방법에 대한 관심은 예상외로 높지 않았고, 도입 여부를 묻는 질문에도 회의적인 의견이 대부분이었다. 결론: 이번 조사로 국내 백내장 수술의 최근 경향 및 변화를 알 수 있었다. Purpose: This study investigated the current trends and changes in the field of cataract surgery in Korea. Methods: The members of the Korean Society of Cataract and Refractive Surgery (KSCRS) and the members of the Korean Ophthalmological Society (KOS) participated in a survey on cataract surgery in 2012, the 16th survey, consisting of 108 multi-ple-choice questions, mailed in July 2013 to 301 KSCRS and KOS members. Sixty two (20.6%) members answered the questions. Current data were compared with previous surveys performed in 2006 and 2009. Results: Most of the respondents (46%) were in the fourth decade, 43% in the fifth decade and 10% in the sixth decade of life. The duration of hospital stay had decreased annually and the use of topical anesthesia (69%) was the most preferred. Self-seal-ing wound construction was the main wound closure technique in phacoemulsification (72%). The most preferred intraocular lens (IOL) for cataract surgery was hydrophobic acrylic (76%) which showed an increasing trend. The implantation of phakic IOL was performed by 41% of the respondents and interest in the value added IOLs such as presbyopia IOL and toric IOL had in-creased annually. In addition, to minimize astigmatism following cataract surgery, several methods were performed according to the degree of astigmatism. However, there was little interest in new cataract surgery techniques such as femtosecond laser and many respondents were skeptical whether to adopt the femtosecond laser cataract surgery system. Conclusions: This survey summarized current trends and changes in the field of cataract surgery in Korea.
일부 공단주변 국민학생의 뇨중 중금속 함량에 관한 연구
이재형,손위익,황인담 의과학연구소 1987 全北醫大論文集 Vol.11 No.3
This study was to analyse the levels of heavy metals in the urine of school children living in the industrial areas and to compare the results with those of agricultural areas. Kinds of analysed heavy metals were lead, cadmium, copper and zinc. The sample collection and analysis were done from September to December in 1986 from 7 to 9 years old children in Seoul(47 cases), Iri(64 cases) industrial areas and Chinan(56 cases) agricultural area. The results were as follows : 1) The concentrations of urinary lead were 28.7±17.7 ug/I in Seoul, 25.3±7.5 ug/I in Iri and 19.3±5.2 ug/I in Chinan. 2) The concentrations of urinary cadmium were 1.5±0.8 ug/I in Seoul, 1.4±0.5 ug/I in Iri, and 0.9±0.3 ug/I in Chinan. 3) The concentrations of urinary copper were 12.8±7.0 ug/I in Seoul, 10.5±8.4 ug/I in Iri, and 10.0±4.5 ug/I in chinan. 4) The concentrations of urinary zinc were 383±279 ug/I in Seoul, 329±133 ug/I in Iri, and 267±181 ug/I in Chinan. 5) In lead, cadmium and zinc concentrations of children, there were statistical differences between the industrial area and the agricultural area. 6) There were no statistically significant difference between the sex. 서울 구로공단지역 47명, 전북 이리 공단지역 64명, 진안 농업지역 56명, 총167명의 7~9세까지의 조사 가능한 어린이를 대상으로 뇨중 중금속 합량을 원자흡광도법으로 분석하여 다음과 같은 결과를 얻었다. 1. 납의 평균농도는 서울 28.7±18.6㎍/ℓ, 이리 25.3±7.5㎍/ℓ, 진안 19.3±5.2㎍/ℓ로 서울과 이리 지역이 진안 지역보다 높았다(p<0.01). 2. 카드뮴의 평균 농도는 서울 1.5±0.8㎍/ℓ, 이리 1.5±0.5㎍/ℓ, 진안 0.9±0.3㎍/ℓ로 서울과 이리 지역이 진안 지역보다 높았다(p<0.01). 3. 구리의 평균 농도는 서울 12.8±7.0㎍/ℓ, 이리 10.5±8.4㎍/ℓ, 진안 10.0±4.5㎍/ℓ로 서울과 이리 지역이 높았으나 통계학적 유의성은 없었다. 4. 아연의 평균 농도는 서울 383±279㎍/ℓ, 이리 329>133㎍/ℓ, 진안 267±181㎍/ℓ로 서울과 이리 지역이 진안 지역보다 높았다(p<0.05). 5. 남녀별 농도 차이는 남자에서 높았으나 통계학적 유의성은 없었다.
하이브리드 복합재료의 모드Ⅱ 층간파괴인성치에 관한 연구
김형진(HYUNG-JIN KIM),박명일(MYUNG-ILL PARK),곽대원(DAE-WON GWARK),김재동(JAE-DONG KIM),고성위(SUNG-WI KOH) 한국해양공학회 2002 韓國海洋工學會誌 Vol.16 No.4
This paper describes the effect of loading rate, specimen geometries and material properties for Mode Ⅱ interlaminar fracture toughness of hybrid composite by using end notched flexure(ENF) specimen. In the range of loading rate 0.5~2㎜/min, there is found to be no significant effect of loading rate with the value of critical energy release rate(GⅡC). There is no dependence of the interlaminar fracture energy upon the specimen width over the specimen widths examined. The value of GⅡC for variation of initial crack length are nearly similiar values when material properties are CF/CF and GF/GF, however, the value of GⅡC are highest with the increasing intial crack length at CF/GF. The values of GⅡC for variation material properties are higher with the increasing moulding pressure when moulding pressures are 307, 431, 585㎪. The SEM photographs show good fiber distribution and interfacial bonding of hybrid composites when the moulding is the CF/GF.