http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
김옥식,권진범,김세완,Binrui Xu,배진혁,손대호,김영일,김세윤,김대환,강진규,강신원 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.80 No.-
Currently, many researchers are focused on promising new energy technologies such as Cu2ZnSnS4-basedsolar cells to replace fossil fuel sources. Investigations into a variety of methods have been done toanalyze the interfacial problems and improve the cell interfacial properties via a variety of methods. Inparticular, In order to improve the electrical performance of Cu2ZnSnSe4 (CZTSe) based solar cells, the Cdpartial electrolyte (Cd PE) treatment that is an effective method in CIGS solar cells prior to applying theirCdS buffer layer to their absorber layer has been studied. In our study, we investigated the Cd PEtreatment time, the Cd PE bath temperature, and the correlation between Cd PE treatment and CdSthickness. The optimum Cd PE absorber treatment was 7 min at 70 C, with a CdS layer of 35 nm thickdeposited cells. This combination increased photo-carrier collection in the short wavelength range andreduced absorber-buffer interface recombination. The efficiency of a 35 nm buffer layer sample withoutPE treatment was 8.90%. The efficiency of another 35 nm buffer layer sample was 10.38% (Voc: 441 mV,Jsc: 38.15 mA/cm2, and FF: 61.58%) after Cd PE treatment due to the increase of Jsc, FF and Rs despite thedeficit of Voc.
양기정,강진규,김대환,성시준,황대규,손대호,심준형,전동환,김정식,김영일,김옥식,박시내 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
2015년 이산화탄소 배출 감축을 위한 Paris Agreement 발표 이후, renewable energy의 역할이 매우 중요해졌으며, 특히 solar photovoltaic은 이산화탄소 감축에 큰 역할을 할 수 있을 것으로 기대되고 있다. 그러나 현재 solar photovoltaic 분야가 기후 변화에 대응하기 위해서는 Si-based solar cell 뿐만 아니라 perovskite, thin-film solar cell 등과 같은 다양한 기술의 발전이 필요하다. 특히 thin-film solar cell 중에서 rare elements를 사용하는 CIGS를 대체하기 위해서는 CZTSSe-based solar cell의 개발이 필요하다. CZTSSe-based solar cell의 효율 향상을 위해서 많은 연구가 진행되고 있다. CZTSSe-based solar cell의 시장 진입을 위해서는 CIGS와 같이 vacuum process를 통한 효율 향상이 필요하다. CZTSSe 태양전지의 연구 동향을 살펴봄으로써 관련 기술을 전망해본다.
계단 보행 근력 보조를 위한 착용형 로봇의 설계 및 제어
김명주(Myeong-Ju Kim),강병현(Byeong-Hyeon Kang),김옥식(Ok-Sik Kim),서기원(Ki-Won Seo),김정엽(Jung-Yup Kim) 한국생산제조학회 2017 한국생산제조학회지 Vol.26 No.1
This paper describes the development of a thigh wearable robot for power assistance during stair climbing. In the wearable robot developed in this study, high-power BLDC motors and high-capacity harmonic reduction gears are used to effectively assist the thigh muscle during stair climbing. In particular, normal ground and stair are distinguished accurately by using wireless smart shoes, and the stair climbing assistance is performed by activating the actuators at an appropriate time. Impedance of the hip joint was effectively reduced by performing friction compensation of the gears, and a wearing adjustment mechanism was designed to fit the robot to the thigh by conveniently modifying the width and tilting angle of the robot using set collars. Consequently, the performance of the developed thigh wearable robot was verified through stair climbing experiments with EMG measurement.