http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
황지성(Ji-Seong Hwang),권석진(Seok-Jin Kwon),이진이(Jin-Yi Lee),서정원(Jung-Won Seo) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
Recently railway industry has been developed not only functional parts such as acceleration and high performance of the railway but also emotional parts such as improved ride comfort and blocking noise. However some important components of railway such as wheel and rail always had exposed too much operation time cyclic load and rolling contact directly. The variations of load vibration and chemical compositions were caused of wheel and rail having a lot of different types of contact fatigue damages. Therefore It is necessary to improve inspection and maintenance technology in order to ensure safety and reliability of railway. Many researchers have already been reported the technology. Magnetic camera one of the non-destructive testing technique can be used to inspect and evaluate the changes of magnetic field in ferromagnetic and paramagnetic materials with cracks. When an electromagnetic is applied to a specimen a magnetic field will be distorted around a crack on the specimen. In present paper the distribution of magnetic property in wheel with cracks using magnetic camera had investigated. The crack can be detected and evaluated by distribution analysis of magnetic field. The magnetic camera technique can be detected and evaluated the crack by rolling contact fatigue.
RF-마크네트론 스퍼터링으로 증착된 산화주석 전자수송층의 광학적 및 전기적 특성에 대한 증착 전력의 영향
황지성(Ji Seong Hwang),이원규(Wonkyu Lee),황재근(Jae Keun Hwang),이상원(Sang-Won Lee),현지연(Ji Yeon Hyun),이솔희(Solhee Lee),정석현(Seok Hyun Jeong),강윤묵(Yoonmook Kang),김동환(Donghwan Kim),이해석(Hae-Seok Lee) 한국태양광발전학회 2021 Current Photovoltaic Research Vol.9 No.1
The properties of the electron transport layer (ETL) have a great effect on perovskite solar cell performance. Depositing conformal SnO₂ ETL on bottom textured silicon cells is essential to increase current density in terms of the silicon-perovskite tandem solar cells. In the recent study, the SnO₂ electron transport layer deposited by the sputtering method showed an efficiency of 19.8%. Also, an electron transport layer with a sputtered TiO₂ electron transport layer in a 4-terminal tandem solar cell has been reported. In this study, we synthesized SnOx ETL with a various sputtering power range of 30-60W by Radio-frequency (RF)-magnetron sputtering. The properties of SnOx thin film were characterized using ellipsometer, UV-vis spectrometer, and IV measurement. With a sputtering power of 50W, the solar cell showed the highest efficiency of 13.3%, because of the highest fill factor by the conductivity of SnOx film.
이진이(Jinyi Lee),황지성(Ji-Seong Hwang),권석진(Seok-Jin Kwon),서정원(Jung-Won Seo) 대한기계학회 2008 大韓機械學會論文集A Vol.32 No.11
A novel nondestructive testing (NDT) system, which is able to detect a crack with high speed and high spatial resolution, is urgently required for inspecting small cracks on express train wheels. This paper proposes a high speed scan type magnetic camera, which uses the multiple amplifying circuits and the crack indicating pulse output system. The linearly integrated Hall sensors are arrayed in parallel, and the Hall voltages from each sensor in the scanning direction are obtained and amplified. High-speed NDT can be achieved by using the exclusive analog-digital converter and micro-processor because the ∂VH/∂x value, which provides the most important crack information, can be obtained by buffering and calculating. The effectiveness of the novel method was verified by examine using cracks on the wheel specimen model.
이진이(Jinyi Lee),황지성(Ji-Seong Hwang),서정원(Jung-Won Seo) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
A novel nondestructive testing (NDT) system, which is able to detect a crack with high speed and high spatial resolution, is urgently required for inspecting small cracks on express train wheels. This paper proposes a high speed scan type magnetic camera, which uses the multiple amplifying circuits and the crack indicating pulse output system. The linearly integrated Hall sensors are arrayed in parallel, and the Hall voltages from each sensor in the scanning direction are obtained and amplified. High-speed NDT can be achieved by using the exclusive analog-digital converter and micro-processor because the ? V<SUB>H</SUB>/V x value, which provides the most important crack information, can be obtained by buffering and calculating. The effectiveness of the novel method was verified by examine using cracks on the wheel specimen model.