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ICP 제논 램프의 가스 압력과 공급 전력에 따른 광학적 특성연구 (pp.1659-1660)
최기승(Gi-Seung Choi),이성진(Seong-Jin Lee),이종찬(Jung-Chan Lee),박대희(Dae-Hee Park) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
After end of the 20th environmental problem was became issue. So about mercury free lighting sources are being studied very much. In this paper, a mercury and electrode free bulb was designed. in this bulb was injected mixed of Xe, Ne and Kr Gases. and then the bulb was discharged by 13.56㎒ RF Power after spectrum, color coordinates and brightness were measured by spectrum meter CS-1000. Measured results were compared and analyzed, also analysis was able to do a characteristic of a gas defensive fight in proportion to a mixing ratio. Therefore the most of high brightness which was 4500㏅/m2 was gained in 1:1 ratio of Xe:Ne at 60W input power.
이기승(Gi-Seung Lee),김윤식(Youn-Sik Kim),강현일(Hyun-Il Kang) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.11
남한은 도시철도는 정철화방식을 장거리는 디젤방식으로 발전해 왔으나, 북한은 전철화 중심의 철도운영을 추진해 왔다. 또한 북한은 직류 3,300v 방식을 남한은 교류25,000v 방식을 사용해 왔기 때문에 전력방식의 통합에 막대한 비용과 시간이 필요하다. 본 논문에서는 남-북한 도시철도 상호연계 시 필요한 전력방식 변경에 따른 변전 및 차량분야설비에 대하여 검토하였다.
전기철도에서의 에너지 절감 방안에 관한 연구 : 조명등 및 전동차 운용 실측 분석
이기승(Lee Gi-Seung),민병훈(Min Byung-Hoon),김학련(kim Hak-Lyun),창상훈(Chang Sang-Hoon) 한국철도학회 2004 한국철도학회 학술발표대회논문집 Vol.- No.-
Recently, since demands of energy saving and efficiency for electric railway system have been increased, the study for electrical operation system is needed. Therefore, case study according to increase of energy consumption, investigate the actual conditions of the operation of electric cars and lightings were analyzed. From the results therefore, it is found that the energy consumption of electric car is much more winter than summer, because heating for protect of the air pipe frozen. But the energy consumption of electric equipment of station office is much more summer than winer, the reason for air-conditioner. In future, according to outdoor air temperature and ridership, wish to study about system that can operate cold, block heater automatically.
이기승,Lee, Gi-Seung 한국정보통신집흥협회 1998 정보화사회 Vol.121 No.-
아시아의 통신산업 및 시장현황은 급속한 보급신장의 진행이 예상되고, 최근에 STO로 인해서 각국이 법제도, 규제를 완화하여 민영화 및 외자도입에 박차를 가하고 있다. 또 개발도상국의 경우 인프라정비에 새로운 BOT나 BTO 방식이 도입되면서 이런 보급은 가속이 되고 있고, 선진국의 경우는 광파이버와 이동체, 위성통신 등 새로운 기술의 도입에 의한 투자가 진행되면서 다른 차원에서 여러 가지 투자수요가 증가하고 있다.
선택적 레이저 용융공정으로 제조된 Al-Si-Mg 합금의 열처리에 따른 미세조직 및 특성평가
이기승,엄영성,김경태,김병기,유지훈,Lee, Gi Seung,Eom, Yeong Seong,Kim, Kyung Tae,Kim, Byoung Kee,Yu, Ji Hun 한국분말야금학회 2019 한국분말재료학회지 (KPMI) Vol.26 No.2
In this study, Al-Si-Mg alloys are additively manufactured using a selective laser melting (SLM) process from AlSi10Mg powders prepared from a gas-atomization process. The processing parameters such as laser scan speed and laser power are investigated for 3D printing of Al-Si-Mg alloys. The laser scan speeds vary from 100 to 2000 mm/s at the laser power of 180 and 270 W, respectively, to achieve optimized densification of the Al-Si-Mg alloy. It is observed that the relative density of the Al-Si-Mg alloy reaches a peak value of 99% at 1600 mm/s for 180 W and at 2000 mm/s for 270W. The surface morphologies of the both Al-Si-Mg alloy samples at these conditions show significantly reduced porosities compared to those of other samples. The increase in hardness of as-built Al-Si-Mg alloy with increasing scan speed and laser power is analyzed due to high relative density. Furthermore, it was found that cooling conditions after the heat-treatment for homogenization results in the change of dispersion status of Si phases in the Al-Si matrix but also affects tensile behaviors of Al-Si-Mg alloys. These results indicate that combination between SLM processing parameters and post-heat treatment should be considered a key factor to achieve optimized Al-Si alloy performance.
ICP 광원 시스템의 Ne:Xe 및 Ne:Ar 혼합가스의 전자온도의 전자밀도 특성
崔起承(Gi-Seung Choi),李鐘餐(Jong-Chan Lee),崔龍成(Yong-Sung Choi),朴大熙(Dae-Hee Park) 대한전기학회 2006 전기학회논문지C Vol.55 No.3
In whole world consciousness of environment maintenance have increased very quickly for the end of the 20th century. To use and disuse toxic substances have been controled at the field of industry. Also the field of lighting source belong to environmental control. And in the future the control will be strong. In radiational mechanism of fluorescence lamp mercury is the worst environmental problem and root. In the mercury free lighting source system the Xe gas lamp is one type. And the Ne:Xe and Ne:Ar mixed gas lamp improve firing voltage of Xe gas lamp. Purpose of this study is to understand ideal mixing-ratio of Ne:Xe and Ne:Ar gas by electron temperature and electron density for mercury free lamp. Before ICP was designed, basic parameters of plasma, which are electron temperature and electron density, were measured and calculated by single-Langmuir probe. Property of electron temperature and electron density were confirmed by changing ratio of Ne:Xe and Ne:Ar.
이기승(Lee Ki-Seung),백진기(Beak Jin-Gi),구자성(Koo Ja-Sung),이안호(Lee An-Ho),성택룡(Seong Taek-Ryong) 한국철도학회 2000 한국철도학회 학술발표대회논문집 Vol.- No.-
The substructure of Light Rail Transit is mainly built on elevated structure that is composed of pier, girder and bridge deck. The bridge deck mostly has been made by field formed reinforced concrete so far. The objectives of the study are to find a method for design and construction of the new bridge deck. Ⅰ-beam is fabricated to make grid and concrete is poured on it at factory. This type can be used for maintenance of duty line by advantages such as good quality control and short construction time.