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.

BGO:Eu 섬광체의 방사선 저항

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.

객체 기반의 임베디드 실물 및 가상 프로토타입 통합 기법

김종일,이정배,양재수,이영란,정영진,한강우,강신관,김대응,Kim, Jong-Il,Lee, Jeong-Bae,Yang, Jae-Soo,Lee, Young-Ran,Jung, Young-Jin,Han, Kang-Woo,Kang, Sin-Kwan,Kim, Dae-Eung 한국정보처리학회 2007 정보처리학회논문지 A Vol.14 No.4

가상 프로토타이핑 환경에서는 다양한 컴포넌트와 라이브러리를 제공함으로써 정밀한 단위까지의 목표 모델의 시뮬레이션이 가능하다. 그리고 실물 프로토타이핑 환경에서는 목표 모델의 임베디드 구동 환경에 가까운 시뮬레이션 환경을 제공한다. 하지만, 가상 프로토타이핑 환경에서는 실제 목표 모델의 구동 환경 요소까지의 시뮬레이션이 어렵고, 실물 프로토타이핑 환경에서는 다양하고 정밀한 제품까지의 시뮬레이션이 어려운 실정이다. 이런 가상과 실물 프로토타이핑 환경의 단점을 보완하기 위한 통합 프로토타이핑 시스템을 위한 연동 기법이 개발되었으며, 본 논문에서는 기존의 실물/가상 프로토타이핑 연동 기법을 개선해서 객체 기반의 임베디드 시스템 통합 프로토타이핑 개발 환경을 구축하였다. 이러한 새로운 임베디드 시스템 개발 환경을 구축함으로써, 재사용성, 유연성, 확장성 그리고 편리성을 가질 수 있다. In the virtual prototyping environment, we can simulate details of a target model using many components and libraries provided in advance on a computer. The real prototyping environment provides the test simulation environment as a real product, but we can't do a detailed simulation of a real product in the virtual prototyping environment, and we can't do various simulations in the real prototyping environment. So, we made a integrated prototyping environment for linkage of the two types of prototyping environments. Also, in this paper, we developed the integrated prototyping environment based on objects. By this kind of embedded system development environment, we can have the advantages as reuse, flexibility, scalability, and more convenient of product making.

응용논문 : 우리나라 품질분임조의 운영실태

김종일,서용성,박영택 ( Jong Il Kim,Yong Sung Suh,Young Taek Park ) 한국품질경영학회 1995 품질경영학회지 Vol.23 No.4

서울중심주의의 문제점과 지방대학/분교의 나아 갈 길

김종일,Kim, Jong-Il 한국대학교육협의회 1994 大學敎育 Vol.67 No.-

광주천의 역사와 문화

김종일,Kim, Jong-Il 한국하천협회 2006 하천과 문화 Vol.2 No.4

광주시는 의향, 예향의 도시특성을 살린 발전전략의 하나로 문화중심도시 조성사업을 추진중에 있고, 구 전남도청부지에 아시아문화의 전당을 건립하고 있다. 한편으로는 무등산, 광주천, 영산강 등 자연환경을 보전하고 쾌적한 도시환경을 조성하기 위해 환경 모범도시 건설에도 역점을 두고 있다.

'한국의 AIDS 쉼터에 대한 나눔

김종일,Kim, Jong-Il 한국가톨릭의료협회 2007 Health & mission Vol.8 No.-

Rebamipide의 생식기관 내 흡수, 배설 및 항산화제로서 불임치료효과

김종일,박현준,박남철,Kim, Jong Il,Park, Hyun Jun,Park, Nam Cheol 대한생식의학회 2005 Clinical and Experimental Reproductive Medicine Vol.32 No.4

Objective: Rebamipide is a propionic acid derivative that has an action of the inhibition of superoxide production and removal of hydroxyl radical with the sperm incubation and cryopreservation. In the present study, to investigate whether rebamipide is useful to treat male infertility and sterility, the author observed the antioxidative effects in patient with male infertility and also examined its absorption and distribution in rat genital organ. Methods: To measure the distribution of rebamipide in reproductive organ in the rat, carbon indicated rebamipide, $^{14}C-OPC-12759$, was orally administered to 10 Spraque-Dawley rats and its organ concentration in serum, liver, kidney, stomach, duodenum, colon, urinary bladder, seminal vesicle, epididymis and testicle were measured each time after 0.5, 1, 2, 4, 8 and 24 hours by using HPLC fluorescent method. The concentrations in semen were measured by HPLC fluorescent method in a sample of 50 infertile males who took 900 mg of rebamipide daily for 3 months. To measure the antioxidative effect and fertility rate for 3 months, each month before and after the treatment, sperm motility, vitality, the oxygen free radical formation, level of peroxidation, fetilizing capacity of semen sample which were obtained from infertile male patients by masturbation after at least 48 hours abstinence were analyzed by computer assisted semen analyzer, eosin-nigrosin stain, chemiluminescence, thiobarbituric acid method and hypo-osmotic swelling test. Simultaneously in a sample that wanted baby, both pregnancy and delivery were researched. Results: The $^{14}C-OPC-12759$ concentration in the body of white rats was highest in gastrointestinal organ like stomach, smal intestine and duodenum and followed by genital organ like seminal vesicle, testis and epididymis. The rebamipide concentration in semen of infertile males was $220.77{\pm}327.84ng/mL$ (SD) which showed a large deviation but it was higher than serum which was $126{\pm}76ng/mL$ (SD). In the infertile males, after the treatment with rebamipide, the level of seminal reactive oxygen species (ROS) and lipid peroxidation have significantly decreased in duration of the treatment (p<0.05) and sperm vitality and fertilizing capacity except sperm motility significantly improved on post treatment of 2~3 months (p<0.05). Out of the 41 cases who hoped for pregnancy, 15 cases (36.6%) became pregnant and 12 cases had childbrith, 2 cases had miscarriage and one case is ongoing. The side effect was observed in 1 case (2%) which experienced diarrhea but it was lost spontaneously. Conclusions: We conclude from this study that rebamipide showed relatively high tendancy of absorption and excretion in the genital organ. In infertile males who had elevated ROS in semen, by specifically inhibiting the cell damage from the antioxidation, a way to preserve sperm motility, vitality and fertilizing capacity was confirmed.

대학교수의 직업복지 : 현실과 이상

김종일,Kim, Jong-Il 한국대학교육협의회 1992 大學敎育 Vol.60 No.-

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.