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전기화학적 방법을 이용한 스테인리스강의 공식 및 틈부식 저항성 측정
이재봉 ( Jae Bong Lee ),민심근 ( Sim Kun Min ) 대한금속재료학회 ( 구 대한금속학회 ) 2007 대한금속·재료학회지 Vol.45 No.5
The resistance to pitting and crevice corrosion of various stainless steels was evaluated by measuring critical pitting temperature (CPT), critical crevice temperature (CCT) and critical crevice potential (CCP). CPT values obtained from immersion test were compared with those done by electrochemical test methods. The relationship between CPT and CCT was investigated in terms of PREN (pitting resistance equivalent index). The effect of types of crevice formers on CCT was examined. CCP values for different stainless steels were measured and compared with their CCT values. The properties of passive film obtained by capacitance and abrading electrode measurements were compared with the resistance to corrosion. Results show that CCP and CCT increased with increasing PREN, indicating the linear relationship between CPT and CCT values. Independent of types of crevice former such as block or washer, CCT showed the same values in both cases. The correlation between CCT and CCP showed that CCT linearly increased with increasing PREN while CCP increased up to 40 of PREN, approached the constant values above 40. The higher PREN values resulted in the lower donor density and the closer repassivation rate parameter to 1.
이재봉(Jae-Bong Lee),심재창(Jae-chang Shim),박원찬(Weon-Chan Park) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
Nowaday, Seoul subway has been playing an important role among public transportation. The number of Passengers of Seoul subway(line1~line4) is more than 4.5 million per day on average according as public transportation ratio is reached to 35% in Seoul. In preparation for a more dense operation of trains and increasing railroad transportation capacity at line 2, we developed equalizing spacer that compensate a drop of electric pressure on Overhead Contact Wire System In this paper, we reviewed the drop of electric pressure by feed extension and equalizing spacer(background of product development, design, production, performance test).
이재봉(Lee Jae-Bong) 부산대학교 한국민족문화연구소 2008 한국민족문화 Vol.32 No.-
The modernity in literature is obtained when daily life establishes concreteness and is shaped. In this viewpoint, the early literature in the modem age involves various possibilities. Although many studies have produced important results, the literature in this age should be more studied. This study focuses on the course that the literature has established its modernity in a different view from the existing studies. If an important characteristic of modem literature is that concrete and daily life mediates narratively, it is significant to search for the basis to make it possible. In this reason, this study pays attention to life-Insaeng and life-Saenghwal. Various mediations are necessary for life-Insaeng and life-Saenghwal to be a narrative by establishing concreteness. First of all, many scholars emphasize on the role of newspapers and magazines. In a newspaper, contemporary events are presented as a form of summarized narrative in time and space and show the various possibilities to be developed into a modem narrative. The magazine, which is both similar to and different significantly from a newspaper, functions as the practical place for the modern intelligentsia to think their ideas. Connected with life-Insaeng and life-Saenghwal, these concrete events and modem ideas form the basis of modern novels. Life-Insaeng and life-Saenghwal form a meaning by being related to the translated Western language such as Life and connected to modern situations. In the course of it, life-Insaeng and life-Saenghwal is related to the necessary elements of modem realism novels through connection with the idioms 'society' and 'reality'. Also connected with a prefix 'sir', their meanings take shape and are intensified. The emphasize on (sil) life-Insaeng, (sil) life-Saenghwal, and (sil) society etc. and the requirement of the connection with reality in the contemporary literary theory can be understood in this view. (Sil) life-Insaeng, (sil) life-Saenghwal, and (sil) society etc. are concretized as 'difficulties in life', which can be said as the darkness of modem materialistic culture, and through this, novels faced with the requirement of establishing the contemporaneity and the concreteness of the daily life. For the novel that couldn't meet the requirement, not only its existence basis is weakened, but also it cannot help losing its persuasive power of existence. We can explain one reason here that new novels, which focused on the popularity and interest, came to end their role in the literary history. In the other hand, the novels that discover the problems of modem society in the stomach and show the self-consciousness of the salary man are important in this view. Because the contemporary literature is not temporary or transient, but it makes sure of various possibilities for the development of literary history.
이재봉(LEE JAE-BONG),전명수(JEON MYUNG-SOO) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.9
우리 나라의 전력 계통은 대도시 중심부 등 사람의 왕래가 빈번한 곳이나 신도시 지역 등에 22.9㎸-y 배전 방식으로 CNCV 지중 케이블로 전력을 공급하고 있으며, 선로 운영상 케이블의 동심중성선을 일정 구간 마다 3선 일괄 공동 접지하는 다중 접지방식을 채택하고 있다. 이는 지락 사고시에는 동심 중성선의 대지 전위 상승을 일정 값 이하로 제한함과 동시에 보호계전기의 동작을 원활히 하기 위함이다. 그러나 지중 배전 선로에서 각 상(A,B,C상)의 부하가 불평형이 될 때는 물론 평형일 경우에도 동심 중성선에는 부하 전류에 비례하는 동심 중성선 순환 전류가 발생되고 있기 때문에 불필요한 손실 전력이 발생하며, 이러한 손실 전력으로 케이블의 내부 온도가 상승되어 케이블의 송전용량이 감소하게 된다. 따라서 2006년 7월12일~14일 대한전기학회 하계학술대회에 이에 대한 문제점과 대책으로 비일괄공동접지에 관한 연구 논문을 발표 한 바 있으며, 본 연구는 일괄공동접지방식의 기능을 저해하지 않으면서 비일괄공동접지기술을 안전하게 시행하는 방법과 예상되는 문제점 및 시행효과 검증에 관한 연구이다.