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Electron diffusion properties in DSSCs by simple Stepped Light Induced Transient measurement
손창희,김동우,( Rajesh Cheruku ),안광순,김재홍 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
The measurement of electron diffusion coefficients and electron lifetimes of dye sensitized solar cells (DSSCs) is essentially required to characterize the cell performance, further investigate high performance solar cells. In this research, stepped light induced transient measurements (SLIM) of photocurrent and voltage is conducted to estimate the electron diffusion coefficients and electron lifetimes of DSSCs. SLIM methods is relatively simple experiment, which can simplify the optical setup and reduce measuring time. In this method, the light having different laser intensity is irradiated to the solar cells with using chopper for lighting on/off. Through measuring the decays of short circuit current and open circuit voltage, the diffusion coefficient and lifetime of photo-generated electron in DSSCs are estimated, subsequently diffusion length is obtained.
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GMAW 루트패스 이면비드 용접에서 아크력제어에 의한 갭변동 극복 방법
손창희,조상명,Son, Chang-Hee,Cho, Sang-Myung 대한용접접합학회 2011 대한용접·접합학회지 Vol.29 No.6
In most industry, manual GTAW welding is preferred for formation of stable back bead in root weld of butt joint. However, manual GTAW welding has low productivity as compared with GMAW, also it has unstable bead quality which depend on skilled workers. So it is necessary to develop process of root pass welding by using automation GMAW that have stable back bead formation and high productivity. In this paper, the design of U-groove with 3mm root face was applied to extend the tolerance of misalignment in condition of standard root gap 1.5mm. Consequently, for the formation of stable back bead in root pass of butt welding, in case of the narrow root gap(0.5mm) the large arc force was applied by increasing the current and voltage. In case of the large root gap(2.5mm), the small arc force was applied by decreasing the current and voltage. Considering the various root gap, the required deposited metal was controlled by welding speed only.
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손창희,Son, Chang-Hee 한국군사과학기술학회 2006 한국군사과학기술학회지 Vol.9 No.2
The performance of a microwave missile seeker and radar operating in an air-to-air look-down mode is strongly influenced by the presence of ground clutter In order to correctly account for the effects of ground clutter, it is required to develop a model capable of representing clutter characteristics as a function of range and/or frequency. In this paper, a program to estimate the clutter reflectivity for various ground conditions is developed, using the actually measured data and the data available from open literatures. In addition, clutter characteristics measured for various ground conditions such as sea, agricultural area, urban city and industrial area through the captive flight tests are presented.
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손창희,이은혜,이주훈,박영서,Son, Chang-Hee,Lee, Eun-Hye,Lee, Joo-Hoon,Park, Young-Seo 대한소아신장학회 2006 Childhood kidney diseases Vol.10 No.2
Nephrotic syndrome in childhood is known to be associated with a hypercoagulable state and thromboembolic complications, among which cerebral venous thrombosis is a very rare and serious one, with only a few isolated reports in the literature. A 9-year-old boy with known nephrotic syndrome was admitted due to a relapse with massive proteinuria and generalized edema. He complained of a prolonged frontal headache. The enhanced brain magnetic resonance imaging(MRI) showed a high signal in the region of the superior sagittal sinus and right transverse sinus consistent with a thrombus. He was managed with steroids, cyclosporine and warfarin. His headache subsided 2 weeks later and proteinuria resolved 1 month later. An MRI 2 months later was normal. We describe this case and review the literature to emphasize the importance of recognizing this potentially life threatening complication and initiating anticoagulation therapy.
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