• Title/Summary/Keyword: Fusion research

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Synthesis of TiO2 by Sol-gel Method and Electrochemical Properties of DSSCs with Controlling pH (졸겔법을 통한 TiO2 합성 및 pH에 따른 DSSC의 전기화학적 특성)

  • Park, A-Reum;Kim, Seon-Hoon;Kim, Doo-Gun;Gu, Hal-Bon;Ki, Hyun-Chul
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.25 no.8
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    • pp.620-625
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    • 2012
  • The sol-gel method has been widely used to synthesize the $TiO_2$ for dye sensitized solar cells and has advantages of easily fabrication process, controlling the $TiO_2$ phase and getting transparent thin-film composed of the $TiO_2$. In this paper, we synthesized the crystalline $TiO_2$ by sol-gel method controlled by the quantity ratio of Nitric acid and Ammonium hydroxide additives. The best efficiency result was obtained by 0.05 M Ammonium hydroxide and that results of Voc, Jsc, FF, and efficiency were 0.68 V, 3.28 mA/$cm_2$, 58.14 and 5.21%, respectively.

Development of High Performance Indium Tin Oxide Films at Room Temperature by Plasma-Damage Free Neutral Beam Sputtering System

  • Jang, Jin-Nyoung;Oh, Kyoung-Suk;Yoo, Suk-Jae;Kim, Dae-Chul;Lee, Bon-Ju;Yang, Ie-Hong;Moon, Ji-Sun;Kim, Jong-Sik;Choi, Soung-Woong;Park, Young-Chun;Hong, Mun-Pyo
    • 한국정보디스플레이학회:학술대회논문집
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    • 2007.08b
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    • pp.1715-1718
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    • 2007
  • New ITO thin film of good performance has been developed by brand-new, plasma-damage-free sputtering process at the room temperature. The room temperature-processed ITO films with optimized conditions as neutral beam acceleration bias of -30V and In & Sn composition ratio of 99:01 gives lower resistivity as $4.22{\times}10^{-4}{\Omega}-cm$ and higher transmittance over 90% a wavelength of 550 nm. The transmission electron microscope (TEM) images of the films show a nano-crystalline structure.

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Effect of strain on the morphology of CNT reinforced polymer composite (CNT가 강화된 고분자 복합체의 모폴로지에 대한 인장변형의 영향)

  • Kook, J.H.;Kwak, S.K.;Kim, M.J.;Yang, J.S.;Park, D.H.;Nah, C.
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2006.11a
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    • pp.164-165
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    • 2006
  • Carbon nanotube(CNT)-reinforced poly(ethylene-co-ethyl acrylate)(EEA) nanocomposites were prepared by melt mixing with a Haake internal mixer. The CNT loading was vaned from 0 to 20 wt%. The changes m CNT dispersion and shape were investigated with FE-SEM observation with and without the Tensile strain of 40%. The CNT was protruded over the fracture surface upon Tensile strain, which is a very interesting behavior.

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Surface Adhesion and Strength Properties of PAI-Nano CS Hybrid Insulation Coating (PAI-Nano CS 하이브리드 절연코팅의 표면접착 및 강도특성)

  • Han, Se-Won;Kim, Suk-Jun;Jang, He-Mi;Kang, Dong-Pil;Lee, Jong-Ho
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2009.04b
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    • pp.59-60
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    • 2009
  • PAI-CS 나노하이브리드 절연코팅의 표면접착과 기계적 강도 및 내아크 내구성에 대하여 실험 분석하였다. 졸-겔법으로 PAI의 강화입자로 선택한 나노 CS는 메트릭스 수지와의 상안정성이 잘 이루어졌다. 나노경도를 측정한 결과 순수 PAI수지와 비교하여 CS첨가량이 증가함에 따라 경도와 탄성율 그리고 강성이 개선되고 있다. 한편 실란처리 방법에 따라 경 도와 탄성율의 개선폭이 달라지는 경향이 있어 제조시 적절한 실란처리에 의한 표면제어가 필요한 것으로 나타났다. 전기적 표면 내아크시험에서 순수 수지와 비교하여 우수한 내구성을 가지고 있어서 이는 서지와 부분방전 등에 노출되는 전력용 절연 코팅으로 사용이 기대된다.

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Multimeric Expression of the Antimicrobial Peptide Buforin II in Escherichia coli by Fusion to a Cysteine-Rich Acidic Peptide

  • Lee, Jae-Hyun;Kim, Jeong-Hyun;Hong, Seung-Suh;Lee, Hyun-Soo;Kim, Sun-Chang
    • Journal of Microbiology and Biotechnology
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    • v.9 no.3
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    • pp.303-310
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    • 1999
  • A cost-effective mass production method for a strong antimicrobial peptide, buforin II, which was isolated from the stomach of Bufo bufo gargarizans, has been developed. This method is based on the neutralization of the positive charge of buforin II by fusion with a cysteine-rich acidic peptide (CAP) to avoid any lethal effect on the host. The neutralized fusion peptide was multimerized and expressed in Escherichia coli as tandem repeats to increase the production yield. Multimers of the CAP-buforin II fusion peptide were successfully expressed at high levels in E. coli as inclusion bodies. More than 100mg of pure buforin II was obtained per 11 of E. coli culture after cleaving the multimeric polypeptide with CNBr. The buforin II obtained from the recombinant E. coli had antimicrobial activity identical to that of natural buforin II. The proposed expression system can provide a cost-effective mass production method for both antimicrobial peptides and other host-lethal basic proteins.

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Field and Strain Dependence of the Critical Current and the n-value for an Internal-tin Processed $Nb_3Sn$ Strand (내부확산법으로 제조된 $Nb_3Sn$ 초전도 선재의 임계전류 및 n-값의 자장, 변이 의존성)

  • Oh, Sang-Jun;Choi, Hee-Kyung;Lee, Chul-Hee;Kim, Kee-Man
    • Progress in Superconductivity
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    • v.9 no.2
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    • pp.152-156
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    • 2008
  • Detailed field and strain dependence of the critical current and the n-value for an internal-tin processed $Nb_3Sn$ strand have been measured. Both the compressive and tensile strain is applied reversibly using Walter spiral probe made of BeCu up to 0.73 %. There is a correlation between the critical current and the n-value for the $Nb_3Sn$ strand studied in this work and the field dependence of the n-value is in agreement with a recent empirical formula. It was further shown that the critical current can be reasonably well fitted by the scaling law based on strong-coupling theory of superconductivity using the relation between the critical current and the n-value.

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Novel deposition technology for nano-crystalline silicon thin film at low temperature by hyper-thermal neutral beam assisted CVD system

  • Jang, Jin-Nyoung;Song, Byoung-Chul;Oh, Kyoung-Suk;Yoo, Suk-Jae;Lee, Bon-Ju;Choi, Soung-Woong;Park, Young-Chun;Hong, Mun-Pyo
    • 한국정보디스플레이학회:학술대회논문집
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    • 2009.10a
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    • pp.1025-1027
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    • 2009
  • Novel low temperature deposition process for nano-crystalline Si thin film is developed with the hyper-thermal neutral beam (HNB) technology. By our HNB assisted CVD system, the reactive particles can induce crystalline phase in Si thin films and effectively combine with heating effect on substrate. At low deposition temperature under $80^{\circ}C$, the HNB with proper incident energy controlled by the reflector bias can effectively enhance the nano-crystalline formation in Si thin film without any additional process. The electrical properties of Si thin films can be varied from a-Si to nc-Si according to change of HNB energy and substrate temperature. Characterization of these thin films with conductivity reveal that crystalline of Si thin film can increase by assist of HNB with appropriate energy during low temperature deposition. And low temperature prcoessed nc-Si TFT performance has on-off ratio as order 5.

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Status of the Factory Acceptance Test for ITER AC/DC Converter Transformers (ITER 초전도자석 전원장치용 변압기의 제작 및 시험 현황)

  • Choi, J.;Suh, J.H.;Oh, J.S.;Shin, H.K.
    • Proceedings of the KIPE Conference
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    • 2016.11a
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    • pp.190-191
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    • 2016
  • 국제 핵융합실험로인 ITER 장치의 초전도자석 전원장치용 CCU/L(Correction Coil Upper/Lower), CCS(Correction Coil Side) 그리고 VS1($1^{st}$ Vertical Stabilization) 형식 등 각 변압기 초도품의 제작을 완료하고 공장시험(FAT, Factory Acceptance Test)을 실시하였다. 이 변압기들은 각 형식별로 2대에서 6대를 제작하지만 각 형식별 초도품 1대에 대해서는 Type Test를 실시하고 나머지 후속물량에 대해서는 Routine Test로 공장시험을 실시하도록 계획되어 있다. 따라서 이 초도품 변압기들에 대해서는 Type Test로 공장시험으로 실시하였고, 그 대표적인 시험항목으로는 단락시험, %임피던스 시험, 뇌임펄스 시험, 정격전류 온도상승시험, 상용주파수 내전압시험 등이 있다. 이들 중 CCU/L, CCS 각 형식의 초도품에 대해서는 2015년도 공장시험을 실시하여 요건에 부합됨을 확인하였고, 본 논문에서는 VS1 컨버터 변압기 초도품에 대하여 Type Test로 실시한 공장시험 내용과 그 결과를 보여준다.

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Application Study of Requirement Traceability Matrix (RTM) to ITER AC/DC Converter Plant Interlock System (PIS) (요건추적매트릭스의 국제핵융합실험로 AC/DC 컨버터 Plant Interlock System(PIS) 적용연구)

  • Shin, Hyun Kook;Oh, Jong-Seok;Choi, Jungwan;Suh, Jae-Hak;Lee, Rack-sang;Lee, Ei-Jae
    • Proceedings of the KIPE Conference
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    • 2015.11a
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    • pp.119-120
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    • 2015
  • ITER 한국사업단은 AC/DC Converter 최종설계검토(FDR)를 2014년 4월에 끝내고, 제작에 관련된 준비사항 점검인 MRR (Manufacturing Readiness Review)를 2014년 10월에 수행하였다. 1차 제작공정인 CCU/L 컨버터와 관련 I&C System은 2014년 11월부터 제작에 착수하여 곧 FAT(Factory Acceptance Test)를 앞두고 있다. 이 시점에서 중요한 것은 FAT를 앞둔 제작된 기기가 ITER의 설계요건을 충분히 만족하는지에 대한 검증을 하는 것이다. 본 논문은 초전도자석 및 컨버터의 이상상태 또는 고장 시에 장치를 보호하는 중요한 Plant Interlock System(PIS)이 ITER의 설계요건을 충실히 반영하였는지 확인하기 위한 요건추적매트릭스(RTM) 기법을 소개하고, Interlock System의 중요기능인 사고 시 초전도 코일에 충전된 에너지를 급속 방전하기 위한 장치인 DLIB와의 연계기능에 적용한 예를 보이고자 한다.

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Implementation and Experiment Result of Hardware-in-the-Loop Simulation(HILS) System for The Verification of ITER AC/DC Converter Control (ITER AC/DC Converter Control 검증을 위한 Hardware-in-the-Loop Simulation(HILS) System 구축 및 실험)

  • Suh, Jae-Hak;Oh, Jong-Seok;CHOI, Jungwan;SHIN, Hyun-Kook;Cha, Hanju;Park, In-Kwon
    • Proceedings of the KIPE Conference
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    • 2015.11a
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    • pp.221-222
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    • 2015
  • ITER AC/DC Converter의 부하는 초전도 코일이며 이에 필요한 컨버터는 총 6종류(2상한:TF, 4상한:PF, CS, VS, CCU/L, CCS)가 있다. 이중 VS 컨버터(${\pm}1050V$, ${\pm}22.5kA$)는 6대가 직렬로 접속되어 운전되고 CS 컨버터(${\pm}1050V$, ${\pm}4.5kA$)는 4대가 직렬로 접속되어 운전한다. 이들 컨버터용 제어기의 개발 단계에서 실 부하상태를 준비하는 것은 어렵기 때문에 $RTDS^{TM}$ (Real Time Digital Simulator)를 이용하여 제어 대상인 High Power 부분과 초전도 코일의 동적 시스템 모델을 HILS(Hardware-in-the-Loop Simulation)로 구축하였다. 본 논문에서는 HILS 구축에 대한 상세한 내용과 이를 활용하여 Control 시스템을 검증한 결과를 서술하였다.

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