• Title/Summary/Keyword: Chun Seung Se

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Fabrication and Characteristics of C(IG)(SeS)2 Absorbers by Selenization and Sulfurization

  • Son, Young-Ho;Jung, Myoung-Hyo;Choi, Seung-Hoon;Choi, Jung-Kyu;Kim, Jin-Ha;Lee, Dong-Min;Park, Joong-Jin;Lee, Jang-Hee;Jung, Eui-Chun;Kim, Jung-Hun
    • Proceedings of the Korean Vacuum Society Conference
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    • 2011.08a
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    • pp.361-361
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    • 2011

  • Cu(InGa)(SeS2) (CIGS) thin film solar cells have recently reached an efficiency of 20%. Recent studies suggest a double graded band gap structure of the CIGS absorber layer to be a key issue in the production of high efficiency thin film solar cell using by sputtering process method. In this study, Cu(InGa)(SeS2) absorbers were manufactured by selenization and surfulization, we have deposited CIG precusor by sputtering and Se layer by evaporation before selenization. The objective of this study is to find out surfulization effects to improve Voc and to compare with non-surfulization Cu(InGa)Se2 absorbers. Even if we didn't analysis Ga depth profile of Cu(InGa)(SeS2) absorbers, we confirmed increasing of Eg and Voc through surlization process. In non-surfulization Cu(InGa)Se2 absorbers, Eg and Voc are 0.96eV and 0.48V. Whereas Eg and Voc of Cu(InGa)(SeS2) absorbers are 1.16eV and 0.57V. And the efficiency of 9.58% was achieved on 0.57cm2 sized SLG substrate. In this study, we will be discussed to improve Eg and Voc through surfulization and the other method without H2S. gas.

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Prevalence of Fascioliasis in the Slaughtered Korean Native Cattle of Soonchun Area (전라남도(全羅南道) 동부지역(東部地域)에서 도살(屠殺)되는 한우(韓牛)의 간질감염율(肝蛭感染率) 조사(調査))

  • Wee, Sung-ha;Park, Seung-joo;Lee, Chung-gil
    • Korean Journal of Veterinary Research
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    • v.27 no.2
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    • pp.317-320
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    • 1987

  • An abattoir survey was carried out on 376 Korean native cattle reared and slaughtered in Soon-chun area to determine the prevalence of Fasciola hepatica infections. The average prevalence of fascioliasis was 44%; the infection rate had a tendency to increase with age. The mean(${\pm}SE$) length and width of the flukes were $24.9{\pm}2.5mm$ and $10.5{\pm}1.7mm$, respectively.

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Systems Engineering Application of Imaginary WIG(Wing-In-Ground Effect) Ship Acquisition Project (가상 함정획득사업의 Systems Engineering 적용 (INCOSE SE Handbook ver. 3.1 중심으로))

  • Lee, Su Oek;Shin, Seung Chun;Choi, Nag Jun
    • Journal of the Korean Society of Systems Engineering
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    • v.5 no.1
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    • pp.57-65
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    • 2009

  • The purpose of Defense Acquisition Project is that the superior weapons validated needs and performance are supplied to military user with limited financial resources and time. The Warship Acquisition Project is not only like this, But also has special characteristics of long project period and first-constructed ship's operation employment. So, The Warship Acquisition Project need systematic and efficient procedure & management. And this paper researches System engineering application of imaginary WIG(Wing-In-Ground Effect) ship acquisition project based Systems Engineering Handbook ver.3.1 published by INCOSE, the lead of field. The Imaginary WIG(Wing-In-Ground Effect) ship acquisition project applied the four processes(technical project, Enterprise & Agreement, Enabling Systems), the basis of INCOSE Engineering Handbook ver.3.1, and the each process output compared with DAPA(Defense Acquisition Program Administration)'s warship acquisition procedure.

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Silicon-micromachined Microneedle for Suction and Injection of Bio Samples

  • Paik, Seung-Joon;Kim, Jong-Pal;Kim, Se-Tae;Park, Sang-Jun;Chung, Seok;Chang, Jun-Keum;Chun, Kuk-Jin;Cho, Dong-Il
    • 제어로봇시스템학회:학술대회논문집
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    • 2001.10a
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    • pp.178.6-178
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    • 2001

  • Silicon-micromachined microneedle for a biofluid diagnosis system is developed. To fabricate microneedles, two sets of processes are used. One is making buried microchannels in silicon wafer using silicon isotropic etch with a SF6 plasma and then trench-refilling. The other is releasing the body of the microneedle by deep silicon etch. The microneedle has a 4 mm-length and about 12 $\mu\textrm{m}$ diameter buried microchannel, a 1.5 mm$\times$l.5 mm-area reservoir, and about 180 $\mu\textrm{m}$thickness body. Preliminary results indicate that microneedles are capable of flowing fluidic samples. The microneedle with a buried microchannel is expected to be integrated with in vitro diagnosis systems and microfluidic devices.

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