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평판형 광-바이오센서용 2차원 광자결정 제작을 위한 Dip-Pen Nanolithography 공정 연구
김준형,이종일,이현용,Kim Jun-Hyong,Lee Jong-Il,Lee Hyun-Yong 한국전기전자재료학회 2006 전기전자재료학회논문지 Vol.19 No.3
Optical waveguide based on symmetric and asymmetric Mach-Zehnder interferometer(MZI) type was designed, fabricated and measured the optical characteristics for the application of biosensor. The wavelength of the input optical signal for the device was 1550 nm. And the difference of refractive index was $0.45\;{\Delta}\%$ between core and cladding of the device. The TM(Transverse Magnetic) mode optical properties of the biosensor were analyzed with the refractive index variation of gold thin film deposited for overclad. Nowadays, nano-photonic crystal structures have been paied much attention for its high optical sensitivity. There is a technique to realize the structure, which is called Dip-Pen Nanolithography(DPN) process. The process requires a nano-scale process patterning resolution and high reliability. In this paper, two dimensional nano-photonic crystal array on the surface was proposed for improving the sensitivity of optical biosensor. And the Dip-Pen Nanolithogrphy process was investigated to realize it.
프레임 브러싱 방법을 이용한 열확산 코어 광섬유 제작 및 특성
김준형,양회영,이상필,이현용,Kim, Jun-Hyong,Yang, Hoe-Young,Lee, Sang-Pil,Lee, Hyun-Yong 한국전기전자재료학회 2007 전기전자재료학회논문지 Vol.20 No.12
Thermal expanded core (TEC) fiber can reduce, being advantaged from thermal diffusion technology, connection loss by expanding the tolerance in relation to axial offset and gap when making optical connection having mode field diameter (MFD) of optical fiber expanded locally. In this paper, TEC fiber fabrication system based on the frame brushing techniques using twin-torch tip was designed and developed in order to maintain a stable thermal diffusion and single-mode when manufacturing TEC fiber. We were able to obtain that varied kinds of TEC fibers of which MFD could have been extended between $20\;{\mu}m$ and $40\;{\mu}m$ by TEC fiber fabrication system. In addition, the characteristic of connection loss was measured by alignment two TEC fibers of which MFD was $30\;{\mu}m$.
Micro cold forging 기술 적용한 베어링강의 피로층 복원
김준형(Jun Hyong Kim),편영식(Young Sik Pyun),카유모브라빌(Ravil Kayumov) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.5-2
베어링이 노후되거나 파손될 경우 궤도륜 및 강구의 표면층은 피로 누적으로 인한 피로층이 형성된다. 피로층 복원을 위하여 냉간단조 방식의 UNSM 기술을 통해 접근하였다. UNSM 기술은 1초에 20,000번 이상의 타격을 금속 표면에 주어, 강소성 및 탄성변형을 발생시키고, 표층부의 조직을 나노결정 조직으로 개질시킨다. 이로써 표면거칠기 및 표면경도가 향상되고, 압축잔류응력이 부가된다. 본 연구에서는 초기 베어링강과 UNSM 적용된 베어링강 시편을 이용하여 회전굽힘피로(RBF) 및 구름접촉피로(RCF) 시험을 진행하였고, 그 결과를 통해 피로층 복원에 대한 냉간단조 방식의 기술 적용 여부를 확인하였다. Bearings raceway & rolling element surface wear & damage due to fatigue. In this study application o f UNSM technology to restore raceway & rolling element surface is carried out. RCF & RBF tests are conducted for bearing steel specimen before & after UNSM. Results justify use of UNSM for restoration o f surface fatigue resistance layer of bearing raceway & rolling elements.