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지르코니아 광페룰 사출성형용 WC 코아 핀의 Diamond Like Carbon 코팅
박현우,정세훈,김현영,이광민,Park, Hyun-Woo,Jeong, Se-Hoon,Kim, Hyun-Young,Lee, Kwang-Min 한국재료학회 2010 한국재료학회지 Vol.20 No.11
A diamond-like carbon (DLC) film deposited on a WC disk was investigated to improve disk wear resistance for injection molding of zirconia optical ferrule. The deposition of DLC films was performed using the filtered vacuum arc ion plating (FV-AIP) system with a graphite target. The coating processing was controlled with different deposition times and the other conditions for coating, such as input power, working pressure, substrate temperature, gas flow, and bias voltage, were fixed. The coating layers of DLC were characterized using FE-SEM, AFM, and Raman spectrometry; the mechanical properties were investigated with a scratch tester and a nano-indenter. The friction coefficient of the DLC coated on the WC was obtained using a pin-on-disk, according to the ASTM G163-99. The thickness of DLC films coated for 20 min. and 60 min. was about 750 nm and 300 nm, respectively. The surface roughness of DLC films coated for 60 min. was 5.9 nm. The Raman spectrum revealed that the G peak of DLC film was composed of $sp^3$ amorphous carbon bonds. The critical load (Lc) of DLC film obtained with the scratch tester was 14.6 N. The hardness and elastic modulus of DLC measured with the nano-indenter were 36.9 GPa and 585.5 GPa, respectively. The friction coefficient of DLC coated on WC decreased from 0.2 to 0.01. The wear property of DLC coated on WC was enhanced by a factor of 20.
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화학용액혼합과 수소환원법으로 제조된 나노 구조 Fe-Co 합금분말의 미세구조 및 자성 특성
박현우,이백희,이규환,김영도 한국분말야금학회 2003 한국분말재료학회지 (KPMI) Vol.10 No.5
The purpose of this study is the fabrication of nano-sized Fe-Co alloy powders with soft magnetic properties by the slurry mixing and hydrogen reduction (SMHR) process. $FeCl_2$0 and $CoCl_2$ powders with 99.9% purities were used for synthesizing nanostructured Fe-Co alloy powder. Nano-sized Fe-Co alloy powders were successfully fabricated using SMHR, which was performed at 50$0^{\circ}C$ for 1 h in H$_2$ atmosphere. The fabricated Fe-Co alloy powders showed $\alpha$' phase (ordered body centered cubic) with the average particle size of 45 nm. The SMHR powder exhibited low coercivity force of 32.5 Oe and saturation magnetization of 214 emu/g.
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형질전환체, Bacillus thuringiensis PT0529 내에서 세가지 내독소 단백질 유전자들의 발현 특성
박현우,제연호,진병래,서숙재,강석권 한국잠사학회 1995 한국잠사곤충학회지 Vol.37 No.2
To characterize expression and formation of three type crystal proteins in transformant, Bacillus thuringiensis PT0529 was analysed by transmission electron microscope and SDSPAGE according to growth. The results showed that the introduced crystal protein genes, cryIVD and cytA, were well expressed at earlier stage than resident crystal protein gene of B. thuringiensis NT0423, and the formation of three-type crystal proteins were also expressed with their own morphology. However, resident crystal protein of B. thuringiensis PT0529 was smaller than that of wild type B. thuringiensis NT0423, suggesting that resident crystal protein production was interfered with introduced two type crystal protein genes.
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박현우,Park, Hyun-Woo 대한족부족관절학회 2011 대한족부족관절학회지 Vol.15 No.2
전족부 통증의 주요 원인 중의 하나인 모턴씨 신경종, 즉 족지간 신경염은 진정한 종양이 아니라 신경 포착 증후군의 일종으로 이해되고 있으며, 진단 시 정확한 이학적 검사와 함께 전족부 통증의 원인이 되는 다른 질환과도 감별해야 한다. 치료에 있어서는 적절한 보존적 치료에도 증상 호전이 되지 않는 환자에게 수술적 치료로서 신경절제술이 주로 시행되어 약 80%의 환자가 만족하는 좋은 결과를 보고하고 있으나, 수술 후 만족스럽지 않은 결과를 보이는 2~35%의 환자를 적절히 처치함으로써 족지간 신경염의 치료 결과를 좀 더 만족스럽게 할 수 있을 것이다. Morton's neuroma is a common cause of forefoot pain, and is also known to be a entrapment neuropathy rather than a true tumor. Precise physical examination is necessary to differentiate from other diagnoses of similar symptoms. If proper conservative treatment modalities fail for this neuritis, neurectomy of interdigital nerve is generally performed, with the results of up to 80% of patient's satisfaction. However the failure rate of 2% to 35% should be improved by proper diagnosis and careful surgery.
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