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단결정 반금속 비스무스 단일 나노선의 Shubnikov-de Haas 진동
김정민,함진희,심우영,이경일,전계진,정원용,이우영,Kim, Jeong-Min,Ham, Jin-Hee,Shim, Woo-Young,Lee, Kyoung-Il,Jeon, Kye-Jin,Jeung, Won-Young,Lee, Woo Young 한국재료학회 2008 한국재료학회지 Vol.18 No.2
The magneto-transport properties of an individual single crystalline Bi nanowire grown by a spontaneous growth method are reported. A four-terminal device based on an individual 400-nm-diameter nanowire was successfully fabricated using a plasma etching technique that removed an oxide layer that had formed on the surface of the nanowire. Large transverse ordinary magnetoresistance (1401%) and negative longitudinal ordinary magnetoresistance (-38%) were measured at 2 K. It was observed that the period of Shubnikov-de Haas oscillations in transverse geometry was $0.074^{T-1}$, $0.16^{T-1}$ and $0.77^{T-1}$, which is in good agreement with those of bulk Bi. However, it was found that the period of SdH oscillation in longitudinal geometry is $0.24^{T-1}$, which is larger than the value of $0.16^{T-1}$ reported for bulk Bi. The deviation is attributable to the spatial confinement arising from scattering at the nanowire surface boundary.
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김정민(Jeung-Min Kim) 전남대학교 종교문화연구소 2008 종교문화학보 Vol.5 No.-
이 글의 목적은 모든 성경을 예수 그리스도의 인격과 사역의 관점에서 이해하고 구속사적 관점으로 해석하는 것이 성경해석의 올바른 태도임을 밝히는 데 있다. 성경을 기록한 목적은 세상을 구속하는 그리스도가 예수라는 것을 요한복음 3장 16절과 디모데후서 3장 15-17절에서 증명한다. 그러므로 예수 그리스도 중심의 구속사적 관점으로 성경을 이해하는 것은 성경해석의 근본원리이다. 기독교의 복음은 예수 그리스도의 인격과 사역이다. 성경을 해석하고 복음을 선포하는 자는 예수 그리스도를 중심으로 한 구속사적 해석을 해야 한다. 복음 선포는 성도들에게 믿음과 거룩한 삶의 능력을 부여하는 방편이다. 성도들이 은혜를 깨닫고 감사하며 소망을 가지고 찬양이 넘치게 하는 것도 복음 선포를 통해 이루어진다. 그러나 오늘날 대부분 성경 강론자들이 종교의 복음 선포와 도덕교육을 구별하지 못하고 성경을 도덕 교과서로 활용하고 있다. 도덕교육은 우리 사회에서 반드시 필요한 일이다. 그러나 그것이 복음 선포는 아니다. 필자는 예수 그리스도 중심의 구속사적 관점에서 성경을 이해하기 위해 창세기 1-3장을 분석하고 해석했다. 그 결과 예수 그리스도께서는 신성과 인성의 두 본성을 지닌 일 인격체이며, 그가 창조주, 통치주, 구속주, 심판주이심을 드러냈다. The object of this study is to define that the correct approach of the hermeneutics is to understand the bible with the viewpoint of redemptional history and to interpret the bible with the viewpoint of the personality and work of Jesus Christ. The Bible shows that Jesus Christ saves the world. Therefore the basic principle of the hermeneutics is to understand the bible with the viewpoint of redemptional history of Jesus Christ. The christian gospel is the personality and the work of Jesus Christ. An exegete of the Bible and a spreader of the gospel have to understand the bible with the viewpoint of redemptional history of Jesus Christ. The spread of the gospel is a way to give the faith and the holy life to christians. It is through the spread of the gospel that christians can perceive blessing, thank God, have their wish, praise God, and give glory to God. However most preachers can not discriminate the difference between the spread of the gospel and the moral education. They use the Bible for a textbook of morality. The moral education is positively necessary for our society. But it is not the spread of the gospel. Therefore the present writer construes the Genesis from chapter one to chapter three with the viewpoint of the redemptional history of Jesus Christ to understand Bible. As the result, I find that Jesus Christ has both divinity and humanity. I come to see that he is the Lord of creation, the Lord of the sovereign, the Lord of redemption and the Lord of judgment.
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대형 보일러 와이어로프 노내비계 및 인양시스템에 관한 연구
하승우(Seung Woo HA),이태호(Tae Ho Lee),이해승(Hae Seung Lee),김정민(Jeung Min Kim),유태우(Tai Woo You),조선영(Sun Young Cho) 대한기계학회 2016 大韓機械學會論文集A Vol.40 No.7
대형 석탄 화력발전소의 보일러는 안정적인 전력량 수급을 위하여, 계속적인 운전 혹은 기동 · 정지가 반복하면서 운전 되는 등 매우 열악한 상태에서 운전되고 있기 때문에 신뢰성을 유지하기 위한 주기적 점검과 정비는 필수적이다. 정비를 위한 기존의 비계시스템은 모든 하중이 하부로 집중되어 일부 부재에 문제 발생시 연쇄적으로 비계 시스템이 붕괴되는 문제점이 있다. 이에 따라 본 연구에서는 새로운 노내비계를 개발하여 상부에서 하중을 분산시키고, 일부 부재에 문제가 발생하더라도 연쇄 붕괴의 위험을 최소화하였다. 또한, 보일러 튜브의 구조로 인하여 직접적인 설치가 어려운 경우 노내비계의 설치를 위한 인양시스템을 개발하여 노내비계의 구조적인 안정성을 향상시키고 비계 작업자의 안전성을 확보하여 발전설비의 건전성을 확보할 수 있었다. Boilers of large-sized coal-fired power plants are being operated under very poor conditions such as continuous operation or repeating of start-up and shutdown for a stable supply of electricity. Thus periodic inspection and maintenance are required to ensure reliability of operation. The loads of existing scaffolding systems for the maintenance of boilers are concentrated in the lower parts structurally, which may cause a serial collapse of the overall scaffolding system when there are problems in some members. Therefore, in this study, a safe furnace scaffolding system is developed by dispersing the loads in the upper part, as well as minimizing the hazards of serial collapsing. In addition, for cases where the direct installation of furnace scaffolding is challenging owing to the structure of the boiler tube, a lifting system for the installation of furnace scaffolding is developed so that furnace scaffolding can be supported to secure the integrity of the power generating facility.
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대형 보일러 와이어로프 노내비계 및 인양시스템에 관한 연구
하승우(Seung Woo HA),이태호(Tae Ho Lee),이해승(Hae Seung Lee),김정민(Jeung Min Kim),전상욱(Sang Wook Jeon),조선영(Sun Young Cho) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
For the stable supply of electricity, the boiler of large-sized coal-fired power plants are being operated in very poor conditions such as continuous operation in high temperature and high pressure condition or repeating of start-up and shutdown. So, it is essentially required to perform periodic inspection and maintenance on them to secure their reliability. In particular, a lot of works are performed in the boiler furnace during preventive maintenance period to prevent the problems expected in the operation, and the most important consideration for this time is the securing of safety for the workers to pursue effective workability. Existing scaffolding systems are assembled in stacking up manner with base foundation in the lower ground, which causes the load concentration in the lower part. So, if there are some problems in the members, the scaffolding system will eventually collapse. So, in this study, safe furnace scaffolding system is to be developed by dispersing the load in the upper part, as well as minimizing the hazard of serial collapsing. Also, for the cases where direct installation of wire-rope type furnace scaffolding is challenging due to the structure of the boiler tube, the lifting system for the installation of furnace scaffolding is to be developed so that the wire-rope type furnace scaffolding can be supported to secure the integrity of the power generating facilities. The scaffolding system to be developed in this study allows partial disassembling and installation while maintaining safety for even the interfered parts when maintaining and replacing the large-sized components such as the tube panel and water wall by the benefit of the characteristics of the upper-supporting system which contributes to the time saving and easy maintenance of the workers. The design on the scaffolding system for this study was performed by comparing and analyzing the steel-frame structures of the boiler upper part and inner tube structures with their drawings. Also, stress analysis, structural analysis as a complete assembly, performance for the members, and mock-up test were performed simultaneously to secure safety, as well as apply the scaffolding system to 500㎿ supercritical coal-fired power plants successfully.
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