• 대한정형외과스포츠의학회:학술대회논문집
• /
• 2005.11a
• /
• pp.39-39
• /
• 2005

• Journal of Korean Electronics
• /
• v.5 no.5
• /
• pp.87-93
• /
• 1985

• 건강소식
• /
• v.15 no.10 s.155
• /
• pp.2-5
• /
• 1991

우리 문화에 대한 애착이 점차로 삭아 들어가고 있는 요즘, 우리 것을 지키기 위한 아마츄어 모임이 눈길을 끈다. 봉산탈춤을 배우고, 이를 통해 우리 것을 지키기 위해, 회원모두가 직장인이라는 악조건(?) 가운데서도 6년동안을 쉼없이 이어져온, 탈을 지키는 사람들의 모임 "달웜지기." "가장 민족적인 것이 가장 세계적인 것" 이라고 말한 어느 문학작가의 말처럼 우리안에서, 세계 속에서 우리 것을 지키기위해 오늘도 어깨를 들썩이는 "달웜지기"를 찾아가봤다. (한국일보사 문화센터 605호 건강교실)

• The Transactions of the Korean Institute of Electrical Engineers B
• /
• v.50 no.2
• /
• pp.59-64
• /
• 2001

The distribution of current in the conductors influenced by the armature geometry and velocity is an important parameter for determining performance of an electromagnetic launcher(EML). the electric current in the early launching stage tends to flow on the outer surfaces of the conductors, resulting in very high local electric current density. However, the tendency for current to concentrate on the surface is driven by the velocity skin effect later in launching stage. The high current density produces high local heating and, consequently, increases armature wear which causes several defects on EML system. This paper investigates the effects of rail/armature geometry on current density distribution, launcher inductance gradient (L'), and contact force. Three geometrical parameters are used here to characterize the railgun system. These are the ratio of contact length to root length, relative position of contact leading edge to root trailing edge, and the ratio of rail overhang to the rail height. The distribution of current density, L', contact force between various configurations of the armature and the rail are analyzed and compared by using the EMAP3D program.