• NEWSLETTER 전기공업
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• no.99-1 s.218
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• pp.2-3
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• 1999

• NEWSLETTER 전기공업
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• no.95-19 s.140
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• pp.45-46
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• 1995

• NEWSLETTER 전기공업
• /
• no.95-20 s.141
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• pp.2-11
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• 1995

• 전기산업
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• v.9 no.3
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• pp.80-103
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• 1998

• 전기산업
• /
• v.10 no.4
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• pp.85-94
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• 1999

• NEWSLETTER 전기공업
• /
• no.95-18 s.139
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• pp.52-52
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• 1995

• NEWSLETTER 전기공업
• /
• no.93-1 s.74
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• pp.1-25
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• 1993

• The Optical Journal
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• s.133
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• pp.24-26
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• 2011

Optics & Photonics 전시관 앞바다에 거대한 풍차가 힘차게 돌아가면서 풍력발전을 하고 있는데 이는 대참사를 극복하고 부흥하는 일본의 미래를 예견하고 있는 듯 했다. 대지진, 쓰나미, 원전사고라는 3대 재해가 큰 충격을 주고 있는 와중에 지난 4월 20일부터 22일까지 파시피코 요코하마에서 열린 이번 전시회는 대일 수출상담, 최신 광학기술 정보수집과 급변하는 일본 현지상황을 파악할 수 있는 좋은 기회가 되었다. 피해지역 주민들이 침착함을 잃지 않고 질서정연한 모습을 보여주면서 "남에게 절대로 폐를 끼치지 않는다는 메이와 쿠(미혹(迷惑)) 정신"이 세계 언론의 스포트라이트를 받았다. 원전사고가 초래한 심각한 전력난은 일본의 전력계획을 대대적으로 개혁시켜서 향후 일본 산업이 새롭고, 더욱 강력하게 일어설 것으로 예상된다.

• Journal of Advanced Navigation Technology
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• v.20 no.1
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• pp.86-92
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• 2016

Recently, solar module is installed in crowded areas to offers services so that people can charge their smartphones or tablets. However, the burden in terms of cost is high to install in areas where utilization ratio is low and installation is difficult in limited spaces. In this paper, a system for collecting and providing the optical power is proposed from the analysis about the person that receives service in each area using the real-time data provided by the state and collected from the actual environment as well as considering the waiting time and the solar charging time in different environments. As a result, This study shows that charge was not delayed since collecting power exceeds charging power. Smartphone was fully charged in ninety-five minutes. we confirmed that with one smartphone, it can be charged a approximately fifty percent of the battery in between ten to twenty minutes, with multiple units they can be charged a approximately twenty percent of the battery in between ten to twenty minutes.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2009.05a
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• pp.845-848
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• 2009

Power semiconductor devices are semiconductor devices used as switches or rectifiers in power electronics circuits. Theyare also caleed power devices or when used in integrated circuits, called power ICs. Some common power devices are the power diode, thyristor, power MOSFET and IGBT (insulated gate bipolar transistor). A power diode or MOSFET operates on similar principles to its low-power counterpart, but is able to carry a larger amount of current and typically is able to support a larger reverse-bias voltage in the off-state. Structural changes are often made in power devices to accommodate the higher current density, higher power dissipation and/or higher reverse breakdown voltage. The vast majority of the discrete (i.e non integrated) power devices are built using a vertical structure, whereas small-signal devices employ a lateral structure. With the vertical structure, the current rating of the device is proportional to its area, and the voltage blocking capability is achieved in the height of the die. With this structure, one of the connections of the device is located on the bottom of the semiconductor.