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폴리페닐카보실란을 이용한 SiOC가 코팅된 스테인리스스틸 제조 및 이의 내부식성 특징
김종일,이윤주,김수룡,김영희,김정일,우창현,최두진,Kim, Jong-Il,Lee, Yoon-Joo,Kim, Soo-Ryong,Kim, Young-Hee,Kim, Jung-Il,Woo, Chang-Hyn,Choi, Doo-Jin 한국재료학회 2011 한국재료학회지 Vol.21 No.1
To improve the chemical stability of metal, the ceramic coatings on metallic materials have attracted interest from many researchers due to the chemical inertness of ceramic materials. To endure strong acids, SiOC coating on metal substrate was carried out by dip coating method using 20wt% polyphenylcarbosilane solution; SiC powder was added to the solution at 10wt% and 15wt% to improve the mechanical properties and to prevent cracks of the film. Thermal oxidation as a curing step was carried out at $200^{\circ}C$ for crosslinking of the polyphenylcarbosilane, and the coating samples were pyrolysized at $800^{\circ}C$ under argon to convert the polyphenylcarbosilane to SiOC film. The thicknesses of the SiOC coating films were $2.36{\mu}m$ and $3.16{\mu}m$. The quantities of each element were measured as $SiO_{1.07}C_{6.33}$ by EPMA, and it can be confirmed that the SiOC film from polyphenylcarbosilane was formed in a manner that was carbon rich. The hardness of the SiOC film was found to be 3.2Gpa through nanoindentor measurement. No defect including cracks appeared in the SiOC film. The weight loss of the SiOC coated stainless steel was within 2% after soaking in 10% HCl solution at $80^{\circ}C$ for one week. From these results, SiOC coating shows good potential for application to protect against severe chemical corrosion of stainless steel.
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김종일,정중현,도시홍,황해선,김성철,김중환 ( Jong Il Kim,Jung Hyun Jeong,Sih Hong Doh,Hae Sun Hwang,Sung Chuel Kim,Jung Hwan Kim ) 한국센서학회 1997 센서학회지 Vol.6 No.1
Bismuth germanate crystals well known as scintillator were grown by Czochralski method. In order to understand a mechanism of radiation resistance in Eu-doped BGO, we measured radiation induced-absorption spectra, excitation spectra, emission spectra and luminescence lifetimes of BGO crystals. We found that the charge transfer state of Eu^(3+) ion is to play a key role to enhance the radiation resistance in BGO crystal. The ^5D_0 emission of Eu^(3+) ions that is not suitable for the radiation detectors due to a long decay time was found to be increased with increasing europium concentration. In the BGO crystal doped with 0.1 mole%, the density of radiation induced color centers was reduced about twenty times and the light output of ^5D_0 was negligible by comparing to that of BGO.
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MIMO에서 시공간 부호화된 MDPSK의 성능을 향상시키기 위한 차동 검파 시스템
김종일,이호진,유항열,김진용,김성열,Kim, Chong-Il,Lee, Ho-Jin,Yoo, Hang-Youal,Kim, Jin-Yong,Kim, Seung-Youal 한국정보통신학회 2006 한국정보통신학회논문지 Vol.10 No.10
최근에 시공간 부호화(Space-Time Code, STC)는 차세 대 이동 통신에서 고속의 신뢰성 있는 통신을 위 해 각광받고 있다. 본 논문에서는 다중경로 페이딩 채널에서 고속의 데이터를 전송하고자 할 경우에 성능을 향상시키고자 트렐리스 부호화된(Trellis-Coded, TC) 차동 시공간 변조(Differential Space Time Modulation, DSTM)를 사용한 MDPSK에서 다중 심벌 검파 시스템을 제안한다 차동 시공간 부호화된 MDPSK의 성능을 향상시키기 위해 DUSTM(differential unitary space-time modulation)을 이용하여 송신기를 설계하고 수신단에서 다중 심 벌 검파를 수행하는 수신기와 디코딩 알고리듬을 개발하며, 이를 위한 새로운 가지 메트릭을 유도한다. Recently, STC techniques have been considered to be candidate to support multimedia services in the next generation mobile radio communications and have been developed the many communications systems in order to achieve the high data rates. In this paper, we Nose the Trellis-Coded Differential Space Time Modulation system with multiple symbol detection. The Trellis-code performs the set partition with unitary group codes. The Viterbi decoder containing new branch metrics is introduced in order to improve the bit error rate (BER) in the differential detection of the unitary differential space time modulation. Also, we describe the Viterbi algorithm in order to use this branch metrics. Our study shows that such a Viterbi decoder improves BER performance without sacrificing bandwidth and power efficiency.
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Deinococcus radiodurans RecA 단백질의 외가닥 DNA-의존성 ATPase 활성 분석
김종일,Kim, Jong-Il 한국미생물학회 2007 미생물학회지 Vol.43 No.4
Deinococcus radiodurans recA는 이 미생물의 방사선 저항성을 나타내는 표현형에 필수적이며 재조합성 DNA 수선 과정에 관여한다. 이 과정에서 RecA 단백질은DNA와 결합하여 반응의 활성 종인 RecA nucleoprotein 필라멘트를 형성한다. DNA-의존성 ATPase 활성과 함께, RecA 단배질의 외가닥 DNA 혹은 이중가닥 DNA와의 상호작용은 RecA 단백질이 관여하는 반응의 중심과정으로 이에 관한 분석을 시도하였다. D. radiodurans RecA 단배질은 DNA에 결합한 DNA-단백질 복합체만이 ATPase 활성을 나타내므로, ATP (혹은 dATP) 가수분해를 측정함으로써 RecA와 외가닥 DNA와의 상호작용 정도를 분석하였다. D. radiodurans RecA 단백질은 외가닥 DNA의 염기 구성의 이질성에 영향을 받았으며, homopolymer인 poly(dT)와의 상호작용에서 가장 높은 가수분해 활성을 보였다. Homopolymer인 합성 DNA-의존성 ATP 및 dATP의 가수분해는 pH 6.0과 9.0의 범위에서 다소 일정한속도로 일어났으며 최적 pH는 7.0과 7.5 사이였다. 외가닥 DNA-의존성 ATPase 활성은 염의 존재에 영향을 받아 KCl이 존재하면 다소 억제되나, K-glutamate가 존재하면 오히려 촉진되었다. RecA 단백질과 외가닥 DNA의 상호작용을 ATP 가수분해로 분석하였을 때 2 mM 이상의 magnesium 이온이 DNA 결합반응에 필요하였으며, 비교적 넓은 범위의 pH에서 외가닥 DNA와의 결합반응이 일어나며, 이러한 결합반응은 당량적인 비(1:3, RecA protein: DNA nucleotide)로 일어났다. The RecA protein of Deinococcus radiodurans is essential for the extreme radiation resistance of this organism. The central steps involved in recombinational DNA repair require DNA-dependent ATP hydrolysis by recA protein. Key feature of RecA protein-mediated activities is the interactions with ssDNA and dsDNA. The ssDNA is the site where RecA protein filament formation nucleates and where initiation of DNA strand exchange takes place. The effect of sequence heterogeneity of ssDNA was examined in this experiment. The rate of homopolymeric synthetic ssDNA-dependent ATP hydrolysis was constant or nearly so over a broader range of pHs. For poly(dT)-dependent ATP or dATP hydrolysis, rates were generally faster, with a broader optimum between pH 7.0 and 8.0. Activities of RecA protein were affected by the ionic environment. The ATPase activity was shown to have different sensitivity to anionic species. The presence of glutamate seemed to slimulate the hydrolytic activity. Dr RecA protein was shown to require $Mg^{2+}$ ion greater than 2 mM for binding to etheno ssDNA and the binding stoichiometry of 3 nucleotide for RecA protein monomer.
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Bacillus amyloliquefaciens에서 분리된 단백질 가수분해 효소의 화학적 수식에 의한 저해양상 분석
김종일,Kim, Jong-Il 한국미생물학회 2003 미생물학회지 Vol.39 No.4
Bacillus amyloliquefaciens psychrotrophic strain이 분비하는 세포 외 단백질 가수분해효소를 정제하여, endopeptidase 활성에 관한 특성을 분석하였다. Protease SE910로 명명된 효소는 단백질 내부의 leucine에 연결된 peptide 결합만을 가수분해하는 endopeptidase로 작용한다. 효소를 특이한 아미노산 잔기에 작용하는 화학수식제와 반응하였을 때 효소의 활성부위에 관여하는 아미노산 잔기가 수식되었을 때는 효소활성이 저해를 받는다. 본 효소는 serine을 수식하는 PMSF에의해 endopeptidase 활성이 완전히 저해되었으며, 카르복실 기능기를 수식하는 화학수식제에 의해 저해되었고, lysine을 화학수식하는 PLP에 의해서는 큰 영향을 받지 않았다. 이것은 본 효소의 endopeptidase 활성에 serine과 aspartic acid 잔기가 관여하는 것을 의미한다. 구조적으로 leucine을 포함하는 유도체인 bestatin은 효소의 endopeptidase 활성을 경쟁적으로 저해하였다. An extracellular protease of Bacillus amyloliquefaciens S94 was purified to apparent homogeneity. The enzyme activity was strongly inhibited by general inhibitor for serine protease, PMSF, suggesting that the enzyme is a serine protease. The purified enzyme activity was inhibited by leucine peptidase inhibitor, bestatin, suggesting that the enzyme is a leucine endopeptidase. When the enzyme was chemically modified with PMSF, which specifically reacted with serine residue on the enzyme, the activity was eliminated. The endopeptidase activity was inhibited by the modifier which chemically modified carboxyl group of aspartate and glutamate. PLP, which would modify lysine residue, did not affect the endopepetidase activity to a greater extent. This demonstrates that serine and aspartate (or glutamate) residues of enzyme would participate in a important function of the endopeptidase activity.
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