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MyungHun Jung,JoonHwan Jang,DoHyung Kang,JungSeok Choi,NaYoung Shin,HeeSun Kim,SukKyoon An,MinSup Shin,JunSoo Kwon 대한신경정신의학회 2010 PSYCHIATRY INVESTIGATION Vol.7 No.4
Objective-The Structured Interview for Prodromal Syndrome (SIPS) from Yale University is intended to diagnose prodromal syndrome of psychosis and to measure the severity of prodromal symptoms. Here, a Korean version of SIPS is presented, and its reliability, validity, and factor structures are examined using a representative Korean sample. Methods-The Korean version of SIPS was administered to 40 participants over a period of 1 year. The inter-rater reliability and internal consistency of the SIPS were then evaluated. In addition, its factor structure was investigated using principal-axis factor analysis. Concurrent validity was explored using Pearson correlation coefficients with the Positive and Negative Syndrome Scale (PANSS). Results-Of the 40 subjects, 12.5% developed psychotic disorders during the 1-year follow-up period. Inter-rater reliability was good (intra-class correlations=0.96), and internal consistency was acceptable (Cronbach’s alpha=0.83). A three-factor resolution displayed the best simple structure and accounted for 52.6% of all item variance. Factors 1 and 2 showed strong correlations with negative symptoms and cognitive dysfunction, respectively, on the PANSS. Factor 3 was not correlated with any factor on the PANSS. Conclusion-The Korean version of SIPS is a reliable instrument for the assessment of prodromal symptoms in subjects and may be used to evaluate prodromal psychosis.
Park, Hyeongsik,Shin, Myunghun,Kim, Hyeongseok,Kim, Sunbo,Le, Anh Huy Tuan,Kim, Youngkuk,Ahn, Shihyun,Jeong, Jae-Seong,Yi, Junsin American Scientific Publishers 2017 Journal of Nanoscience and Nanotechnology Vol.17 No.11
<P>A glass texturing process was developed to enhance the light scattering in the wideband wavelength range for thin-film hydrogenated amorphous silicon solar cells. Periodic honeycomb structures were patterned on glass substrates by a simple photolithography and chemical wet-etching process using HF (10%) solutions. We investigated the optical properties of the textured glasses for various etching times (i.e., the statuses of the etching steps), which were characterized using optical measurements and finite-difference time-domain simulations. We found the reproducible texturing conditions for obtaining high transmittance and haze values, and the angular distribution measurements showed that the scattered light is diffracted and trapped within the solar cell. The textured glass substrates showed a maximum transmittance of 95.5% and a haze ratio of about 61% in the wideband wavelength range, and the finite-difference time-domain simulation expected a very high short-circuit current density of 21.9 mA/cm(2) for a single-junction thin-film hydrogenated amorphous silicon solar cell employing the honeycomb textured glass substrates, which will be useful for developing high-performance thin-film hydrogenated amorphous silicon solar cells.</P>
Park, Hyeongsik,Shin, Myunghun,Kim, Hyeongseok,Kim, Sunbo,Le, Anh Huy Tuan,Kang, Junyoung,Kim, Yongjun,Pham, Duy Phong,Jung, Junhee,Yi, Junsin Elsevier 2017 Optical materials Vol.66 No.-
<P><B>Abstract</B></P> <P>A comparative study of 3-dimensional textured glass morphologies with variable haze value and chemical texturing of the glass substrates was conducted to enhance light trapping in silicon (Si) thin film solar cells (TFSCs). The light trapping characteristics of periodic honeycomb structures show enhanced transmittance and haze ratio in numerical and experimental approaches. The periodic honeycomb structure of notched textures is better than a random or periodic carved structure. It has high transmittance of ∼95%, and haze ratio of ∼52.8%, and the haze property of the angular distribution function of transmittance shows wide scattering angles in the long wavelength region because of the wide spacing and aspect ratio of the texture. The numerical and experimental approaches of the 3-D texture structures in this work will be useful in developing high-performance Si TFSCs with light trapping.</P> <P><B>Highlights</B></P> <P> <UL> <LI> 3-D Light trapping structures are investigated for Si thin film solar cells. </LI> <LI> A glass texturing method is developed using chemical solutions of diluted HF. </LI> <LI> FDTD simulation shows a notched periodic honeycomb texture will be effective one. </LI> <LI> Periodic texturing shows better light scattering performance than random structures. </LI> <LI> Fabricated periodic honeycomb structure shows high transmittance and haze values. </LI> </UL> </P>
Ray Tracing 기법을 이용한 태양광 발전량 시뮬레이션
박혜진(Park Hyejin),신명훈(Shin Myunghun) 한국태양에너지학회 2023 한국태양에너지학회 논문집 Vol.43 No.6
Recently, with the increase in regulations on self-power generation of energy in buildings, building-integrated photovoltaic systems (BIPV), that is, solar power on the outer walls of buildings, are also on the rise. Thus, considering the shadow of a building, the power generation of an elevated solar cell module according to differences in location, shadow, and reflectance (albedo) must be analyzed. In this study, we used a ray-tracing method and a three-dimensional (3D) optical design simulation program. For ray-tracing simulation, we produced sophisticated structures and provided optical properties, and a correction process for the surface temperature was conducted using a temperature correction formula. In addition, the characteristics and accuracy of the simulation were compared using Solar Pro data. Finally, in this study, we report the amount of power generated according to differences in location, shade, and reflectance (albedo).
Lee, Da Jung,Lim, Jung Wook,Shin, Myunghun,Kim, Gayoung,Yun, Sun Jin Elsevier 2018 Solar Energy Materials and Solar Cells Vol.183 No.-
<P><B>Abstract</B></P> <P>A low temperature deposition process was developed to fabricate ultra-thin, transparent, multi-layered electrodes (TMEs) suitable to be used on variously shaped flexible substrates, as those utilized in the transparent solar cells of building-integrated photovoltaic (BIPV) systems. The fabricated TMEs consisted of a bottom layer (BL) of gallium doped zinc oxide (GZO), an Ag-layer, and optoelectronic-controlling layers (OCLs) of GZO; and exhibited a high transmittance of 90% at 550 nm, and a low sheet resistance of 9.4 Ω/sq. at the thickness of ~ 100 nm. Because the Ag of TMEs easily detach from inorganic or amorphous surfaces, the GZO-BL was chemically treated in a diluted acetic and nitric acid mixture (10:2) to generate changes in its surface energy and improve the Ag adhesion. To quantitatively evaluate the Ag adhesion of TMEs, we proposed and conducted a tape pull-out adhesion test, and found the optimum GZO-BL texturing condition. The developed TMEs were used as the front transparent conductive electrodes of transparent a-Si:H solar cells to tune their reflection colors. By changing the thickness of the OCL, a wide range of colors was obtained without serious efficiency variations, as was predicted by optical simulations. The fabricated transparent cells show a high efficiency of 4.8%, as well as a high average transmittance of ~ 20% in the visible range. The developed TME structure, using the proposed deposition process, can be fabricated on various substrates and can be applied to devices that require a variety of colors such as BIPVs, wearable PVs, and the PVs of moving vehicles.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We use ultra-thin transparent multi-layered electrodes of a-Si:H solar cells. </LI> <LI> They exhibit a high transmittance of 90%, and a low sheet resistance of 9.4 Ω/sq. </LI> <LI> To improve adhesion, chemically surface-treatment is carried out on GZO (BL) layer. </LI> <LI> Various colors are implemented without serious reduction of cell efficiency. </LI> <LI> The solar cells show a high efficiency and transmittance of 4.8% and ~ 20%. </LI> </UL> </P>