http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
민철기(Chulki Min),이만섭(Manseop Lee) 한국레이저가공학회 2008 한국레이저가공학회 학술대회 논문집 Vol.2008 No.-
FPCB (Flexible Printed Circuit Board) cutting by femtosecond laser was performed to make clean, debrisless, accurate cutting. We put 3 kHz, 300mW femtosecond pulse laser with 3 mm/s velocity, where center wavelength is 775 mm, and clean cutting was produced. No electro-shorting was occurred. No unwanted material damage is shown.
민철기(Chulki Min),이만섭(Manseop Lee) 한국레이저가공학회 2008 한국레이저가공학회 학술대회 논문집 Vol.2008 No.-
The surface treatment of PDMS (polydimethylsiloxane) by femtosecond laser can help the accurate and fine fabrication of microstructure. Very small beam power is enough to make dots or lines on th PDMS' surface. We put femto second laser single pulse, and multi pulses on PDMS with different power and/or repetition rates to make dots, lines and rectangular or square type surface treatments. Pulse patterning is stable and almost least unwanted surface damage is shown.
민철기(Chulki Min),이만섭(Manseop Lee) 한국레이저가공학회 2007 한국레이저가공학회 학술대회 논문집 Vol.2007 No.-
Polymide is one of the useful materials in industry. We put single femto second laser pulse on polymide and observe the surface grooving. Pulsewidth is 172fs, laser power changes from 1㎽ to 390㎽. Pulse patterning is stable and almost no unwanted surface damage is shown.
Physical Properties of In-Mold Coating for Powder Slush Molded Skin
Woojeong Oh(오우정),Ok Kim(김억),Junghwan Lee(이정환),Hyeondon Kim(김현돈),Daeup Kim(김대업),Chulki Min(민철기) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Physical properties of in-mold coating (IMC) for powder slush molded (PSM) instrument panel skin were investigated. To get excellent appearance of skin, optimized IMC and release agent spray conditions were determined, which were 15 ㎝ of distance, at 30 sec of flash off time, and 15-20 microns of IMC thickness. For effective melting of powder, powder slush molding conditions were determined as 240℃ of mold temperature, 4 times of rotation time for slush molding, and 50℃ of initial mold temperature. The reliability test result of IMC satisfied all specification requirements.
민철기,이만섭 한국레이저가공학회 2008 한국레이저가공학회지 Vol.11 No.2
Polyimide iS one of the useful materials in industry. The surface treatment of polyimide by a femtosecond laser can help accurate and fine fabrication of microstructure. And it can change the transmittance and reflectance of polyimide, too. We put femtosecond laser pulses on polyimide for rectangular or square type surface treaments and observe the change of transmittance and reflectance. Pulsewidth is 172 fs, laser power changes for fabrication are from 5 mW to 20 mW, and transmittance and reflectance are measured under 20m W, 300m W, and 920 mW. Pulse patterning is stable and almost no unwanted surface damage is shown. As power increases, working depth increases but working line width does not increase significantly. As speed changes, they also have same results. It shows the efficiency of a femtosecond laser is good and thermal damage is small for polyimide.