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48 results on '"Kim, Hayong"'

21. Development of Multivariate Flood Damage Function for Flood Damage Assessment in Gunsan City, Korea

Author

Necesito Imee, Kim Hayong, Yu Insang, Cheong Tae Sung, and Jeong Sangman

Subjects
Multivariate statistics, Geography, Flood myth, Cartography
Abstract

한국의 경제성장과 재해방재기술 향상에도 불구하고 홍수와 같은 자연재해는 여전히 국민들을 위협하고 있으며 특히, 태풍에 의해 발생한 홍수피해는 막대한 재산과 인명피해의 원인이 되어왔다. 홍수에 의한 피해액을 추정하는 것은 홍수대책마련과 홍수피해를 저감하는데 매우 중요하다. 이와 관련하여 피해 및 손실을 평가 및 분석하고 재해 위험 관리 계획에 따라 해당...

Published
2017

36. Carbon- and Oxygen-Free Cu(InGa)(SSe)2 Solar Cell with a 4.63% Conversion Efficiency by Electrostatic Spray Deposition

Author

Yoon, Hyun, primary, Na, Seung Heon, additional, Choi, Jae Young, additional, Kim, Min Woo, additional, Kim, Hayong, additional, An, Hee Sang, additional, Min, Byoung Koun, additional, Ahn, SeJin, additional, Yun, Jae Ho, additional, Gwak, Jihye, additional, Yoon, KyungHoon, additional, Kolekar, Sanjay S., additional, van Hest, Maikel F. A. M., additional, Al-Deyab, Salem S., additional, Swihart, Mark T., additional, and Yoon, Sam S., additional

Published
2014
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47. Drought assessment based on real-time drought index

Author

Oh, Kukryul, Yu, Insang, Kim, Hayong, Kim, Sangdan, Kim, Lee-hyung, and Jeong, Sangman

Abstract

AbstractThe continuous increase in water demand is primarily caused by the explosive population growth rate due to urbanization and industrialization, and thus, is accelerated in both agricultural and residential parts. Drought adversely affects the quality of life and the whole economic situation of the country, and therefore, an accurate assessment of the incidence of water shortage is required. The existing researches for calculating drought indices do not consider the water demand and the water supply from irrigation facilities, streams, and water storages; thus, existing hydrological drought indices have many limitations in determining actual drought situations in the country. Only water supply without water demand is considered on the existing hydrological drought index therefore, water shortage cannot be calculated. On the other hand, real-time drought index (RDI) evaluates drought on a daily basis in real-time and calculate water shortage according to residential, agricultural, and industrial water. In this study, the water shortage based on real-time water supply and demand is calculated and a new drought index corresponding to such shortage is developed. The drought assessment is performed using the proposed drought index during national drought events from year 2008 to 2009. Based on the results of this study, it turns out that the regions supplied by small reservoirs and streams are more vulnerable in drought as compared with regions supplied by large-scale dams and rivers. The applicability of the proposed drought index is proved to be appropriate, from the comparison results between major historical drought situations and the corresponding situation modeled by this study.

Published
2015
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48. Carbon- and Oxygen-Free Cu(InGa)(SSe)2Solar Cell with a 4.63% Conversion Efficiency by Electrostatic Spray Deposition

Author

Yoon, Hyun, Na, Seung Heon, Choi, Jae Young, Kim, Min Woo, Kim, Hayong, An, Hee Sang, Min, Byoung Koun, Ahn, SeJin, Yun, Jae Ho, Gwak, Jihye, Yoon, KyungHoon, Kolekar, Sanjay S., van Hest, Maikel F. A. M., Al-Deyab, Salem S., Swihart, Mark T., and Yoon, Sam S.

Abstract

We have demonstrated the first example of carbon- and oxygen-free Cu(In,Ga)(SSe)2(CIGSSe) absorber layers prepared by electrospraying a CuInGa (CIG) precursor followed by annealing, sulfurization, and selenization at elevated temperature. X-ray diffraction and scanning electron microscopy showed that the amorphous as-deposited (CIG) precursor film was converted into polycrystalline CIGSSe with a flat-grained morphology after post-treatment. The optimal post-treatment temperature was 300 °C for annealing and 500 °C for both sulfurization and selenization, with a ramp rate of 5 °C/min. The carbon impurities in the precursor film were removed by air annealing, and oxide that was formed during annealing was removed by sulfurization. The fabricated CIGSSe solar cell showed a conversion efficiency of 4.63% for a 0.44 cm2area, with Voc= 0.4 V, Jsc= 21 mA/cm2, and FF = 0.53.

Published
2014
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