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R.B.V. Chalapathy,Gwang Sun Jung,Young Min Ko,Byung Tae Ahn,HyukSang Kwon 한국태양광발전학회 2013 Current Photovoltaic Research Vol.1 No.2
Cu2ZnSnS4 thin film have been fabricated by rapid thermal annealing of dc-sputtered metal precursor with Cu/ZnSn/Cu stack in sulfur ambient. A CZTS film with a good uniformity was formed at 560℃ in 6 min. Cu2SnS3 and Cu3SnS4 secondary phases were present at 540°C and a trace amount of Cu2SnS3 secondary phase was present at 560℃. Single-phase large-grained CZTS film with rough surface was formed at 560ºC. Solar cell with best efficiency of 4.7% (Voc = 632 mV, jsc = 15.8 mA/cm<SUP>2</SUP>, FF = 47.13%) for an area of 0.44cm<SUP>2</SUP> was obtained for the CZTS absorber grown at 560℃ for 6 min. The existence of second phase at lower-temperature annealing and rough surface at higher-temperature annealing caused the degradation of cell performance. Also poor back contact by void formation deteriorated cell performance. The fill factor was below 0.5; it should be increased by minimizing voids at the CZTS/Mo interface. Our results suggest that CZTS absorbers can be grown by rapid thermal annealing of metallic precursors in sulfur ambient for short process times ranging in minutes.
Chalapathy, R.B.V.,Jung, Gwang Sun,Ko, Young Min,Ahn, Byung Tae,Kwon, HyukSang Korea Photovoltaic Society 2013 Current Photovoltaic Research Vol.1 No.2
$Cu_2ZnSnS_4$ thin film have been fabricated by rapid thermal annealing of dc-sputtered metal precursor with Cu/ZnSn/Cu stack in sulfur ambient. A CZTS film with a good uniformity was formed at $560^{\circ}C$ in 6 min. $Cu_2SnS_3$ and $Cu_3SnS_4$ secondary phases were present at $540^{\circ}C$ and a trace amount of $Cu_2SnS_3$ secondary phase was present at $560^{\circ}C$. Single-phase large-grained CZTS film with rough surface was formed at $560^{\circ}C$. Solar cell with best efficiency of 4.7% ($V_{oc}=632mV$, $j_{sc}=15.8mA/cm^2$, FF = 47.13%) for an area of $0.44cm^2$ was obtained for the CZTS absorber grown at $560^{\circ}C$ for 6 min. The existence of second phase at lower-temperature annealing and rough surface at higher-temperature annealing caused the degradation of cell performance. Also poor back contact by void formation deteriorated cell performance. The fill factor was below 0.5; it should be increased by minimizing voids at the CZTS/Mo interface. Our results suggest that CZTS absorbers can be grown by rapid thermal annealing of metallic precursors in sulfur ambient for short process times ranging in minutes.
Sun, Gwang Min,Lee, Jaegi,Uhm, Young Rang,Baek, Hani Korean Nuclear Society 2020 Nuclear Engineering and Technology Vol.52 No.11
Boron has been considered to play a nutritionally important role in humans and animals, but its biochemical functions are not clearly understood. Though there are signs that boron affects the mineral and hormone metabolisms, there is no comprehensive epidemiological evidence establishing a relationship between a boron intake and osteoporosis due to the excretion of calcium in the bones. In this study, we investigated the influence of boron intake on the calcium excretion of old female mice in the menopause. The concentrations of calcium in backbone, thigh bone, blood, kidney, liver, and spleen were investigated by using instrumental neutron activation analysis.
Performance of a Compton Suppression Spectrometer of the SNU-KAERI PGAA Facility
Sun Gwang Min,Park Chang Su,Choi H.D. Korean Nuclear Society 2003 Nuclear Engineering and Technology Vol.35 No.4
The \gamma-ray spectrometer of the PGAA (Prompt Gamma Activation Analysis) facility constructed at HANARO of the Korea Atomic Energy Research Institute was upgraded to the multi-mode spectrometer including the single mode, the Compton suppression mode and the pair mode. The performance of the spectrometer was tested and summarized. The background count rate and the uncertainty of the detection efficiency were reduced greatly in comparison with those before the new installation.
Introduction of Precise Nuclear Measurements and Geostandards
Gwang-Min Sun,Young Rang Uhm,Jaegi Lee 한국자기학회 2021 한국자기학회 학술연구발표회 논문개요집 Vol.31 No.1
Recently, as the use of analytical instruments increases, researches are actively conducted to improve the accuracy and precision of the analysis results. In particular, geostandards are used in many aspects such as deducting calibration curves in geochemical analysis and determining deviations by comparison with true values. In Korea, studies on the development and production of geostandards have been attempted with increasing demand for Korean geostandard materials, but subsequent work has not been carried out. Currently, research institutes that support the quantitative analysis are using geostandards from foreign research institute like USGS, NIST and GSJ etc. However, due to the disadvantage that it is expensive and difficult to obtain, it is necessary to develop a geostandards using Korean rocks. In this study, we selected three representative granite and obsidian samples and checked the feasibility of developments as a Korean geostandards. Moreover, in order to make a glass geostandard, natural glass rock is used for X-ray fluorescence analysis, Neutron Activation Analysis, and Mössbauer spectroscopy then we will examine the feasibility as a glass geostandards. Glass geostandards are essentially used to precision geochemical analyzers. Further, in order to overcome the limitation in the composition range of the geostandards, it is required to prepare a glass geostandards having a higher composition. In order to minimize the inhomogeneity from the microlites contained in the glassy rocks and the incomplete melting, we conducted the XRF and the Prompt gamma - ray Activation Analysis using the obsidians from Mt. Beakdu, Korea and the Kyushu, Japan, which are the main provinces of the obsidian artifacts excavated from the Korean Peninsula. And then we performed comparison with two analytical data from two different methods. The correlations of the major oxide contents show relative good coincidence between the PGAA and XRF bulk analytical data. Also, in mineralogical and geochemical studies on the Mt. Beakdu, Korea and the Kyushu, Japan, obsidians, the origination of the magma compositions and the crystallization as shown in analyses of Mössbauer spectra.
최보경 ( Bo Kyung Choi ),이희선 ( Hee Sun Lee ),황인혜 ( In Hye Hwang ),신경화 ( Kyung Hwa Shin ),최문기 ( Mun Ki Choi ),최보광 ( Bo Gwang Choi ),안강희 ( Kang Hee Ahn ),남형석 ( Hyung Seok Nam ),황종민 ( Jong Min Hwang ),성은영 ( 대한내과학회 2010 대한내과학회지 Vol.79 No.4
Background/Aims: There is an increased risk of tuberculosis (TB) with impaired cellular immunity and extrapulmonary TB is more common in patients with chronic kidney disease. We explored the clinical features and treatment outcomes of extrapulmonary TB according to renal function. Methods: This retrospective study reviewed the medical records of patients diagnosed with extrapulmonary TB between January 2003 and December 2007. We classified the patients into two groups using the glomerular filtration rate (eGFR), estimated using the Modification of Diet in Renal Disease (MDRD) formula cut-off of 60 mL/min/1.73 m2 and evaluated their clinical features, treatment outcome and mortality (Group I vs. Group II, ≥ 60 mL/min/1.73 m2). Results: The mean eGFR of Groups I (n=30) and II (n=312) was 34±19 and 102±26 mL/min/1.73 m2, respectively. The pleura was the most frequent site of TB in both groups (Group I, 30.0% vs. Group II, 28.2%; p=0.379). There was no treatment failure or recurrence in either group. The mortality was higher in Group I (22.2% vs. 2.8%; p<0.01). In a multivariate analysis, eGFR<60 mL/min/1.73 m2 was an independent risk factor for mortality (HR=11.51, CI 2.512-52.741; p=0.002). Conclusions: Mortality related to extrapulmonary TB was higher in patients with impaired kidney function and kidney function was an independent predictor. However, there was no difference in treatment failure and recurrence according to renal function. (Korean J Med 79:387-393, 2010)
( Min Young Park ),( Sun Hwa Lim ),( Mi Na Byon ),( Hye Young Han ),( Mi Young Kim ),( Jin Hwa Jung ),( Sang Hun Lee ),( Dong Ho Kim ),( Hyoung Moo Park ),( Gwang Jun Kim ) 대한산부인과학회 2012 대한산부인과학회 학술대회 Vol.99 No.-
To determine obstetric outcomes after external cephalic version (ECV) performed at term. In a retrospective study of ECV among term breech presentation singleton pregnant women at Chung-Ang Univerisity Hospial between November 2009 and July 2013, we evaluate the mode of delivery after ECV procedure and analyze factors influencing success and complication using for Mann-Whitney test. All contraindication of ECV ( placenta previa, uterine malformation, intrauterine growth retardation with pathologic Doppler and Multiples) Among 96 EVC attempts, 67.4% of women had cephalic presentation (n=64) and 32.6% (n = 31) remained breech presentation. Vaginal delivery was observed by 40 out of 64 (62.5%) among successful ECV , whereas 11 (17.2%) had in-labour Caserean sections. After unsuccessful ECV 31 patients had elective Caserean sections. When comparing the successful and unsuccessful ECV groups, there is a statistical significant difference in position (p=0.013), count of attemps (p=0.001), use of Yutopar (p=0.001). These groups did not show a significant difference in parity, AFI, BMI, newborn weight and newborn gender. In successful ECV group, there is statistical significant difference between vaginal delivery and Caserean sections of parity, engagement. On the same day after the ECV procedure two patients, who had unsuccessful ECVs, had Caesarean sections. One was due to pathological cardiotocogram with no clinical correlation. The other Caesarean section was due to progressed labor. No harm to fetal or maternal health resulted from ECV. ECV was found to be a safe procedure at term. The rate of surgical delivery after successful ECV was low. A trial of ECV at term and beyond is feasible.