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수열 합성된 나노구조를 갖는 ZnO 에 대한 표면 및 계면 결함의 상대적인 영향
박철민(Cheolmin Park),이지혜(Jihye Lee),소혜미(Hye-Mi So),장원석(Won Seok Chang) 대한기계학회 2014 大韓機械學會論文集B Vol.38 No.10
온도를 달리하여 수열합성 시킨 두 ZnO nanostructure 의 자외선 검출 소자에 대해 표면 결함과 기판과의 계면 결함의 상대적인 영향을 분석했다. 실험은 laser 가 인가된 상태에서 bias voltage sweep rate 을 조절하여, 그에 따른 전류-전압 곡선을 통해 이루어졌다. 수열 성장이 적게 된 ZnO nanostructure 의 경우 405, 355 nm laser 인가시, bias voltage sweep rate 을 느리게 할 수록, 전류-전압 기울기가 낮아졌으며, 대조적으로 성장이 크게 된 시료의 경우 기울기가 높아졌다. 이에 대한 이유는 계면과 표면 결함 영향의 차이로 발생됨이 고려됐다. 이와 같이 laser 가 인가된 상태에서 bias voltage sweep rate 에 따른 전류-전압 곡선분석 실험은 M-S-M (Metal-Semiconductor-Metal) 구조를 갖는 수열 성장된 ZnO 의 표면 및 계면 결함을 관찰하는데 도움을 줄 것으로 생각된다. The relative concentration of surface and interfacial defects in hydrothermally grown ZnO nanostructures was investigated by a comparison of two samples having different growth temperatures via bias voltage sweep rate under laser illumination of 405 and 355 nm. The current of small ZnO nanostructures (growth temperature of 75 °C) decreased when induced more slowly bias voltage sweep rate under the laser illumination. In contrast, the current of large ZnO nanostructures (growth temperature of 90 °C) increased. This difference in currents indicates the relation of relative defects concentration between surface and interfacial defects of ZnO nanostructure . Our experimental approach has potential applicability in the analysis of influence on defects in ZnO devices.
박철민(Cheolmin Park),조재현(Jaehyun Cho),이영석(Youngseok Lee),박진주(Jinjoo Park),주민규(Minkyu Ju),이윤정(Youn-Jung Lee),이준신(Junsin Yi) 한국태양광발전학회 2013 Current Photovoltaic Research Vol.1 No.1
The current solar cell industry is experiencing a temporary plateau due to a sluggish economy and oversupply. It is expected that the solar industry can see similar growth to that of the recent past by overcoming the current situation, as there is growing demand globally for solar energy. The current situation led to restructuring of the world"s solar industry, and domestic firms will need to have competitiveness through strategic approaches and proprietary technology to survive in the global solar market. Crystalline and amorphous silicon based solar cells have led the solar industry and occupied half or more of the market thus far. They will do so in the future PV market as well by playing a pivotal role in the solar industry. In this paper, the current status and prospects of silicon based solar cells, from materials to comprehensive and high efficiency technology that can emerge in the future, are discussed.
IOT(Internet of Things)를 활용한 싱글 스크루 공기압축기 에어엔드 스마트 모니터링 시스템
박철민(Cheolmin Park),오승준(Seungjun oh),강태형(Taehyung Kang),박진성(Jinseong Park),윤홍석(Hongseok Youn) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
In the conventional air compressor, in particular, rotational elements such as bearing, housing and structural members can be worn out or damaged with respect to the operating time and excessive stress. However, it is hard to estimate the expected wear amount or evaluate the exact amount of damage during the operation by the conventional analytic approaches using the mathematical models. To monitor the interested parts in the air compressor air-end, various sensors are efficient to evaluate the conditions of the mechanical part by using such as the deformation sensor and vibration sensor etc. Moreover, the wireless communication technique enables transmit various sensor signals data to the operator regardless of operator’s locations on the internet. In this paper, we demonstrate the smart monitoring system for single-screw type air compressor via IOT(internet of things) technique.