非晶質 Silicon 薄膜의 製作 및 그 Doping 效果

최범식,김수길,고년규,황정남,정원모,이철주 연세대학교 자연과학연구소 1982 學術論文集 Vol.9 No.-

SiH_4 기체에 PH_3 및 B_2H_6 기체를 0.7% 체적비로 혼합하여 rf glow 방전법으로 n형 및 p형 a-Si:H 박막을 기판온도 120℃에서 제작하여, 광투과도 측정, 열처리에 따른 전기 전도도의 변화 등을 조사하여 이들의 doping 효과를 연구하였다. n형, p형 및 undoped a-Si:H 박막의 optical gap은 각각 1.73eV, 1.86eV 및 1.86eV로 doping이 많이 이루어질수록 줄어 들었다. 250℃에서 열처리한 시료들의 상온에서의 전도도는 각각 2×10^-2Ω^-1㎝^-1, 5×10^-8Ω^-1㎝^-1, 5×10^-7Ω^-1㎝^-1이었고, 활성화 에너지 ??E는 각각 0.16eV, 0.49eV 및 0.48eV이었다. 300℃에서 열처리한 결과, ??E는 줄어 들고 전도도는 증가하였다. 350℃ 및 450℃에서 열처리한 결과 dehydrogenation 효과로 인하여 n형과 p형은 서로 상반되는 결과를 보였다. 즉, n형 시료의 전도도는 감소하고 ??E는 증가하였지만, P형 시료의 전도도는 증가하고 ??E는 감소하였다. 저온 영역에서 구한 n형 시료의 전도도로부터 hopping 활성화 에너지를 구한 결과 0.085eV이었다. Thin n-type and p-type a-Si:H films were prepared by rf glow discharge decomposition of silane mixed with 7×10^-3 parts per volume of phospine or diborane. All specimens were deposited on glass substrates held at 120℃. In order to determine the doping effects the opital absorption and dc conductivity of these specimens were measured after annealing at various temperatures. The optical gap was 1.73eV in the case of the n-type specimens, 1.80eV for the p-type, and 1.86eV undoped. This showed that the gap width decreased as the doping increased. The room temperatuer conductivities of these specimens annealed at 250℃ were 2×10^-2Ω^-1㎝^-1, 5×10^-8Ω^-1㎝^-1, and 5×10^-7Ω^-1㎝^-1, respectively, and the activation energies, ??E, of these specimens were 0.16eV, 0.49eV, and 0.48eV, respectively. For specimens annealed at 300℃, ??E decreased and the conductivity increased. When these specimens were annealed at 350℃ and 450℃, dehydrogenation caused opposite effects on the n-type and p-type specimens; the conductivities of n-type specimens decreased and ??E increased, but the conductivities of p-type specimens increased and ??E decreased.From an investigation of the temperature dependence of the conductivity of the n-type specimen in the low temperature region, we determined that the hopping activation energy was 0.085eV.

Head-Space SPME에 의한 생체시료 중 메스암페타민류 분석(Ⅱ)

최화경,양원경,한은영,최상길,정희선 內務部 國立科學搜査硏究所 2001 國立 科學 搜査 硏究所 年報 Vol.33 No.-

A Study on Storage of Major Herbal Medicine Materials, Zingiberis Rhizoma

Choi,Seong-Kyu,Yun,Kyeong-Won,Shin,Kil-Man 한국자원식물학회 2002 Plant Resources Vol.5 No.3

To develop optimal storage method of root of Zingiberis Rhizoma, which has been grown as major cultural herbal medicine materials, root of Zingiberis Rhizoma, was stored for 10 months with different packing materials and sealing methods. The loss in dry weight as influenced by packing materials and sealing methods was the lowest at vacuum packing and followed by complete sealing methods with transparent polyethylene film. The ratio of root rot during the storage period was not significantly different between packing materials but was significantly different between sealing conditions. Conclusionally, vacuum packing and complete sealing with polyethylene film appears to be optimal for storage of Zingiberis Rhizoma.

높은 지향성을 갖는 Air Line 결합기 설계

길준범,이성원,최영호,박종임,안달,박준석 호서대학교 반도체제조장비국산화연구센터 2000 학술대회 자료집 Vol.2000 No.1

본 논문에서는, 일반적인 스트립 구조의 결합기가 갖는 문제 즉, 높은 온도에서 나쁜 특성을 보이는 문제점을 극복하고자 Air Line Type의 결합기를 구현하였다. 또한 이 결합기는 24dB이상의 지향성을 가지고 있다. 해석을 위해 짝수 모드와 홀수 모드 해석법을 사용하였고, EM-Simulation으로 확인한 특성과 실제 제작된 20dB, 30dB Cellular 대역(800∼900MHz) Air Line 결합기의 결고 특성은 좋은 일치를 보여주고 있다. 또한 최대 장점인 온도 특성은 온도 데이터를 통하여 온도에 강한 특성을 보임을 알 수 있다.

CIO의 정보시스템감사대응과 감사품질에 관한 연구 : CIO를 중심으로

김길조,손원기,최훈 中央大學校經營硏究所 2002 經營學論集 Vol.28 No.2

판소리의 사설짜기에 대한 고찰 - 〈새타령〉을 중심으로 -

손길원,최진형 京畿專門大學 2000 京畿專門大學 論文集 Vol.- No.28

This study's main aim is the type of construction of Pansori-sasul. The Pansori is important genre in the many cultural discourses at 19th century. The Pansori has very flexible way to construct text with contemporary other genre. A horizontal movement of unit text is main theory of constructing Pansori-sasul. With this view point, this study will consider on <Saetaryung>. <Saetaryung> is a song of Jap-ga and piece of Pansori-sasul. So, study on <Saetaryung> will explain the theory of construction Pansori-sasul. This study will show construction theory of Pansori with a point of difference with Jap-ga and Pansori with focus on <Saetaryung>. The conclusion of this study will explain a type of discourses in 19th century of our classical genre of lyricism and narrative. And that will be able to show the theory of construction Pansori-Sasul, too.

전자선 증착장치 및 ITO 박막의 제작과 그 특성에 관한 연구

김수길,최범식,우정주,고년규,황정남,정원모,이철주 연세대학교 자연과학연구소 1982 學術論文集 Vol.9 No.-

태양 전지의 제작시 투명 전극막으로 쓰이는 ITO 박막을 제조하기 위하여 cathode 접지 방식의 전자총을 가진 정전 편향 집속형의 전자선 증착 장치를 제작하였다. 가속전압이 0∼15kV, 필라멘트 전류가 0∼28A, 두 전극판 사이의 간격이 11mm, anode와 deflector 사이의 간격이 30mm인 최적 실험조건하에서 생성된 전자선 spot의 크기는 길이가 20mm 폭이 1mm였으며, 전자선의 출력은 약 400W였다. 이 전자선 증착 장치를 이용하여 1600℃까지의 증발 온도를 가진 도체와 절연체 등을 쉽게 증착시킬 수 있었으며, 만드어진 ITO 박막은 약 5000Å의 두께에서 10^-1∼10^-2Ω·㎝의 비저항과 95%의 광투과율을 갖는다. An electron beam evaporator with a cathode grounded type electron gun was designed and constructed in order to deposit ITO thin films for photovoltaic applications. The optimum condition was observed with electode spacing of 11mm, 30mm between anode and deflector, a cathode inner diameter of 3mm and an anode inner diameter of 5mm. As the accelerating voltage varies from 0 to 15kV and ghe filament current from 0 to 28 A, the minimum electron beam spot has a 20mm length, and 1mm width and the output power ranges from 0 to 400W under the above optimum conditions. We can deposit materials whose evaporation temperature is over 1600℃ using this evaporator. And as a result ITO thin film showed a low resistivity of 10^-1∼10^-2Ω·㎝ and the transmittance of 95%.

문서화상의 신뢰성 향상을 위한 효율적 합성알고리즘

우종원,김호걸,최길성,유재수,조기형 충북대학교 컴퓨터 정보통신 연구소 1998 컴퓨터정보통신연구 Vol.6 No.2

본 논문은 Distance 합성알고리즘과 Runlength-Distance 합성알고리즘을 이용하여 효율적으로 문서화상을 합성하기 위한 방법을 제안한다. 데이터 또는 문서의 화소정보를 비밀리에 화상에 혼합하는 합성 알고리즘에는 임 Runlength 합성알고리즘(RM), Distance 합성알고리즘(DM), Runlength-Distance 합성알고리즘(RDM)등이 제안되었다. 그러나 이러한 합성알고리즘들을 적용한 기존의 방법은 암호화 시간이 길어지고 신뢰도가 떨어지는 문제점을 갖는다. 본 논문에서는 DM과 RDM 알고리즘을 보다 효율적으로 적용하여 암호화 시간을 단축시켰다. 또한, 기존 합성알고리즘에서의 합성방법을 변형한 형태로서 모듈별로 디지털 서명을 합성하는 방법을 제안한다. 이렇게 모듈별로 디지털 서명을 가함으로써 보안 전송에 있어서 가장 중요한 요소인 신뢰도를 증가시키도록 하였다. Runlength Mixing(RM), Distance Mixing(DM) and Runlength-Distance Mixing(RDM) algorithms have been proposed for mixing of bits of document-images security. However the existing mixing algorithms have some problems that increase cryptographic time and reduce confidence. In this paper, we propose an algorithm for mixing document images efficiently by using DM and RDM. When we mix digital signatures and secure documents, by using DM the proposed algorithm reduces the encryption time of document images. In addition the proposed algorithm mixes digital signatures by each module in order to increase confidence. It is shown through the experiments that our algorithm outperforms the existing mixing algorithms in terms of encryption time and confidence.

SO₂와 NOx 동시제거를 위한 흡수제의 반응특성

이형근,최원길,박영성 大田大學校 環境問題硏究所 1997 환경문제연구소 논문집 Vol.2 No.-

Recently the more stringent emission standards of government promulgate the incentive for developing the technology capable of simultaneous removal of SO₂ and NOx from flue gas. This study was to develope an enhanced absorbent in reactivity and adsorption ability for removing SO₂and NOx from flue gas. The characteristics of spray drying absorption(SDA) process and status of SDA process were studied, as well as analysis of properties of absorbent and its manufacturing method. CaO, MgO, and NaHCO₃were selected as a alkali reagent, and they were mixed with fly ash(FA) or activated carbon powder(AC) and their the reactivity and adsorption ability toward SO₂and NOx were greatly enhanced through got water curing process. Among the highest. The surface area of MgO mixed with FA(30%) was greater than NaHCO₃, but the SO₂and NOx removal performance of MgO mixed with FA(30%) was much lower than that of NaHCO₃. The removal quantity of SO₂and NOx per mole of NaHCO₃mixed with FA(30%) was 2.7 mole, this meant that the effect of physical adsorption was greater than chemical reaction between absorbent and acid gases.

5-Fluorouracil과 그 유도체를 함유하는 Solid Lipid Nanoparticles 제조와 평가

서혜선,최명신,한규원,박소민,김길수 이화여자대학교 약학연구소 2005 藥學硏究論文集 Vol.- No.16

Solid lipid nanoparticles(SLNs) are particulate systems for parenteral drug administration and have good biocompatibility and stability. SLNs were prepared with lauric acid, as the lipid core. Tween 20 and tween 80 were used as surfactant. 5-fluorouracil and 1-benzoyl-5-fluorouracil were used as model drugs. Drug-loaded SLNs were prepared by the hot homogenization technique in order to evaluate the physical stability, entrapment efficiency of drugs as well as release profile. The particle size of SLNs was 40~600 nm. By increasing speed, the mean particle size of SLfs was decreased. And entrapment efficiency in the case of using 1-Benzoyl-5-fluorouracil was higher than using 5-Fluorouracil. The higher surfactant concentration, the faster release rate at the range of 1.5~2.5%.