• 제목/요약/키워드: Kim SeJoo

검색결과 749건 처리시간 0.038초

Evaluation of Shutdown LOCA for OPR1000

  • Choi, Han-Rim;Kim, Se-Chang;Kim, Eun-Kee;Yoon, Duk-Joo;Jun, Hwang-Yong
    • 한국원자력학회:학술대회논문집
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    • 한국원자력학회 2005년도 춘계학술발표회
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    • pp.577-578
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    • 2005
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수중로봇키트 모형의 SE기반 개발을 통한 공학교육 사례 (An Example of Engineering Education through SE-based Development of Underwater-robot Kit Model)

  • 김현식;강형주;만동우
    • 공학교육연구
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    • 제15권3호
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    • pp.40-46
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    • 2012
  • This paper deals with an example of the engineering education through the SE-based development of an underwater-robot kit model. It has a purpose of establishing the example of a SE-based development by undergraduate through executing the requirement and functional analysis, hardware and software design, manufacturing, test and evaluation for developing the model. In addition, it also has a purpose of establishing the basis of the development of an optimized underwater-robot kit through understanding the weight and buoyancy characteristics and the actuation and propulsion characteristics of the developed model.

청녹색 레이저 다이오드 구조에 관한 TEM 관찰 (TEM Observations on the Blue-green Laser Diode)

  • 이확주;류현;박해성;김태일
    • Applied Microscopy
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    • 제27권3호
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    • pp.257-263
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    • 1997
  • Microstructural characterizations of II-VI blue laser diodes which consist of quaternary $Zn_{1-x}Mg_xS_ySe_{l-y}$ cladding layer, ternary $ZnS_ySe_{l-y}$ guiding layer and $Zn_{0.8}Cd_{0.2}Se$ quantum well as active layer were carried out using the transmission electron microscope working at 300 kV. Even though the entire structure is pseudomorphic to GaAs substrate, the structure had contained numerous extended stacking faults and dislocations which had created at ZnSe/GaAs interfaces and then further grown to the top of the epilayers. These faults might be expected to cause the degradation and shortening the lifetime of laser devices.

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Electromagnetic Interference Shielding Effectiveness of Electroless Nickel-plated MWCNTs/CFs-reinforced HDPE Matrix Composites

  • Choi, Woong-Ki;Hong, Myung-Sun;Lee, Hae-Seong;An, Kay-Hyeok;Bang, Joon-Hyuk;Lee, Young Sil;Kim, Byung-Joo
    • Bulletin of the Korean Chemical Society
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    • 제35권2호
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    • pp.597-600
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    • 2014
  • In this work, the electromagnetic interference shielding effectiveness (EMI-SE) of carbon nanotube/carbon fiber-reinforced HDPE matrix composites are investigated with various preparation conditions, such as the carbon fiber and carbon nanotube content, the presence of metal additives, as well as mixing speed and time. It was found that the EMI-SE of the composites increased with filler contents and metal additives. These results indicate that the content and length of carbonaceous fillers determine the electric networks in the composites, resulting in the control of the EMI-SE of the composites.