ZrO₂·SO₄^2-에 담지된 백금촉매의 저온산화반응성에 대한 연구

김기석,이태정,김병삼,김두성,Kim, Kiseok,Lee, Tae Jung,Kim, Byoung Sam,Kim, Du Soung 한국공업화학회 1998 공업화학 Vol.9 No.1

초강산 담체인 $ZrO_2$ $SO_4{^{2-}}$에 담지된 백금촉매(0.2, 0.5wt% Pt)의 저온 산화반응성을 cyclohexane의 완전산화반응에 대하여 조사 하였다. 충전층 관형반응기에서 반응물질의 전화율로 측정된 촉매활성은 촉매의 산성도와 비표면적에 비례하여 증가하였다 : $Pt/ZrO_2$ $SO_4{^{2-}}$ 촉매 제조과정에서 K(potassium)를 첨가하여 촉매의 산성도와 비표면적을 감소시켰을 때 촉매활성은 K첨가량에 비례하여 감소하였다. 또한 $Pt/ZrO_2$ $SO_4{^{2-}}$촉매는 훨씬 더 큰 비표면적을 가진 $Pt/SiO_2$, 또는 $Pt/Al_2O_3$촉매보다 뛰어난 활성을 보였다 : l5,000ppm cyclohexane농도와 $18,000hr^{-1}$공간속도를 가진 반응물질 흐름을 $250^{\circ}C$에서 0.2wt% $Pt/ZrO_2$ $SO_4{^{2-}}$촉매를 사용하여 전화시킨 결과 96%의 cyclohexane전화율을 보인 반면, 같은 반응조건 하에서 0.2wt% $Pt/SiO_2$와 0.2wt% $Pt/Al_2O_3$촉매는 각각 83%와 79%의 cyclohexane전화율을 보였다. Reactivity of Pt catalysts(0.2, 0.5 wt% Pt) supported on solid super acid, $ZrO_2$ $SO_4{^{2-}}$ for low-temperature oxidation was investigated for complete oxidation of cyclohexane. Catalytic activity measured as reactant conversion in a packed-bed tubular reactor increased in accordance with the acidity and specific surface area of the catalyst activity and specific surface area of $Pt/ZrO_2$ $SO_4{^{2-}}$ catalyst were diminished by adding potassium during catalyst preparation. the catalyst activity decreased in accordance with the amount of potassium added. In addition, $Pt/ZrO_2$ $SO_4{^{2-}}$ catalyst exhibited an activity greater than that of a $Pt/SiO_2$ or $Pt/Al_2O_3$ catalyst possessing much larger specific surface area at $250^{\circ}C$ for the reactant stream of 15.000 ppm cyclohexane concentration and $18,000hr^{-1}$ space velocity, a cyclohexane conversion as high as 96% was obtained over 0.2 wt% $Pt/ZrO_2$ $SO_4{^{2-}}$, whereas cyclohexane conversions over 0.2 wt% $Pt/SiO_2$ and 0.2 wt% $Pt/Al_2O_3$ were 83 and 79%, respectively.

위상잠금 열영상 현미경의 온도분해능 분석

김기석,이계승,김건희,허환,김동익,장기수,Kim, Ghiseok,Lee, Kye-Sung,Kim, Geon-Hee,Hur, Hwan,Kim, Dong-Ik,Chang, Ki Soo 한국비파괴검사학회 2015 한국비파괴검사학회지 Vol.15 No.1

본 연구에서는 기존의 열영상 측정 장치에 비해 위상잠금기법을 채용한 열영상 측정 장치의 온도분해능이 얼마나 향상될 수 있는지를 평가하기 위해 흑체시스템과 마이크로 레지스터 시편을 이용한 실험을 수행하여 개선된 온도분해능을 확인하였다. 일반적으로 적외선 열영상 측정 장치의 노이즈 수준 또는 온도분해능은 연속적으로 측정된 열영상의 픽셀별 온도의 평균과 각각의 측정값의 편차에 대한 제곱의 평균으로 정의되는 잡음등가온도차(noise equivalent temperature difference, NETD)라는 척도를 이용하여 평가되고 있다. 하지만 위상잠금 열영상 기법을 적용하면 더욱 편리한 방법을 이용할 수 있는데 이는 측정된 열영상 신호의 위상과는 무관한 온도의 진폭에 관한 정보를 이용하는 것이다. 연구결과를 통해 알 수 있듯이, 위상잠금 기법을 적용하게 되면 측정된 신호의 온도분해능 성능을 보여주는 잡음등가온도차가 크게 향상되었으며 이는 위상잠금기법이 내부적으로 수행하는 평균화 작업과 필터링 기능 때문인 것으로 판단되고 있다. In this study, we analyzed and showed the enhanced thermal resolution of a lock-in infrared thermography system by employing a blackbody system and micro-register sample. The noise level or thermal resolution of an infrared camera system is usually expressed by a noise equivalent temperature difference (NETD), which is the mean square of the deviation of the different values measured for one pixel from its mean values obtained in successive measurements. However, for lock-in thermography, a more convenient quantity in the phase-independent temperature modulation amplitude can be acquired. On the basis of results, it was observed that the NETD or thermal resolution of the lock-in thermography system was significantly enhanced, which we consider to have been caused by the averaging and filtering effects of the lock-in technique.

ZrO2 , SO42- 에 담지된 백금촉매의 저온산화반응성에 대한 연구

김기석,이태정,김병삼,김두성 ( Kiseok Kim,Tae Jung Lee,Byoung Sam Kim,Du Soung Kim ) 한국공업화학회 1998 공업화학 Vol.9 No.1

초강산 담체인 ZrO₂·SO₄^(2-)에 담지된 백금촉매(0.2, 0.5 wt% Pt)의 저온 산화반응성을 cyclohexane의 완전산화반응에 대하여 조사하였다. 충전층 관형반응기에서 반응물질의 전화율로 측정된 촉매활성은 촉매의 산성도와 비표면적에 비례하여 증가하였다: Pt/ZrO₂·SO₄^(2-) 촉매 제조과정에서 K(potassium)를 첨가하여 촉매의 산성도와 비표면적을 감소시켰을 때 촉매활성은 K첨가량에 비례하여 감소하였다. 또한 Pt/ZrO₂·SO₄^(2-) 촉매는 훨씬 더 큰 비표면적을 가진 Pt/SiO₂, 또는 Pt/Al₂O₃촉매보다 뛰어난 활성을 보였다 : 15,000ppm cyclohexane농도와 18,000hr^(-1)공간속도를 가진 반응물질 흐름을 250℃에서 0.2 wt% Pt/ZrO₂·SO₄^(2-)촉매를 사용하여 전화시킨 결과 96%의 cyclohexane전화율을 보인 반면, 같은 반응조건 하에서 0.2 wt% Pt/SiO₂와 0.2 wt% Pt/Al₂O₃촉매는 각각 83%와 79%의 cyclohexane전화율을 보였다. Reactivity of Pt catalysts(0.2, 0.5 wt% Pt) supported on solid super acid, ZrO₂·SO₄^(2-), for low-temperature oxidation was investigated for complete oxidation of cyclohexane. Catalytic activity measured as reactant conversion in a packed-bed tubular reactor increased in accordance with the acidity and specific surface area of the catalyst: as the acidity and specific surface area of Pt/ZrO₂·SO₄^(2-) catalyst were diminished by adding potassium during catalyst preparation, the catalyst activity decreased in accordance with the amount of potassium added. In addition, Pt/ZrO₂·SO₄^(2-) catalystexhibited an activity greater than that of a Pt/SiO₂ or Pt/Al₂O₃ catalyst possessing much larger specific surface area: at 250℃ for the reactant stream of 15,000ppm cyclohexane concentration and 18,000 hr^(-1) space velocity, a cyclohexane conversion as high as 96% was obtained over 0.2 wt% Pt/ZrO₂·SO₄^(2-), whereas cyclohexane conversions over 0.2 wt% Pt/SiO₂ and 0.2 wt% Pt/A1₂O₃were 83 and 79%, respectively.

Inhibitory effect of Mori Cortex Radicis, Farfarae Flos and Asteris Radix extracts on release of inflammatory mediators in LPS-induced HMC-1 cells

김기석,Shin Hyung Kim,장형진 경희대학교 융합한의과학연구소 2011 Oriental Pharmacy and Experimental Medicine Vol.11 No.2

Mori Cortex Radicis, Farfarae Flos, Asteris Radix had been prescribed to treat asthmatic symptoms and help to eliminate sputum in oriental pharmacology, but the antiinflammatory mechanism of the herbs are not sufficiently defined. Here, we investigated the anti-inflammatory mechanism of the herb 80% ethanol extracts on LPS-induced HMC-1 cells. To determine inhibitory effect of the herb extracts on chronic inflammation, expression of COX-2 and production of pro-inflammatory cytokines IL-6 and TNF-αwere measured. COX-2 expression was downregulated dosedependently and release of IL-6 and TNF-α were inhibited by effect of each herb extracts. This study provides information about the cellular mechanism of anti-inflammatory effect of these three herbs extracts which might be helpful to study antiinflammatory agents.

정밀유도무기에 대한 적극적인 방어대책

김기석,Kim, Gi-Seok 한국방위산업진흥회 1985 國防과 技術 Vol.- No.82

닭의 Inclusion Body Hepatitis 발생례(發生例) 보고(報告)

김기석,김순복,이영옥,최정옥,남궁선,박근식,Kim, Ki Seuk,Kim, Soon Bok,Rhee, Young Ok,Choi, Chang Ok,Namgoong, S.,Park, Keun Sik 대한수의학회 1981 大韓獸醫學會誌 Vol.21 No.1

The occurrence of inclusion body hepatitis was confirmed for the first time in Korea from chickens submitted for diagnosis to this Institute from a farm located in the vicinity of Anyang. The chickens showed no specific clinical signs except for moderate anemic conditions. At autopsy, livers were swollen and mottled with numerous stellate subcapsular hemorrhages and necrotic foci. Severe nephritis and catarrhal enteritis were also seen. The most notable microscopic changes were seen in the liver. These included eosinophilic intra-nuclear inclusion bodies in the hepatocyes, massive hemorrhages and necrosis and fatty changes in the liver parenchema.

보이지 않는 항공기-Stealth의 정체

김기석,Kim, Gi-Seok 한국방위산업진흥회 1989 國防과 技術 Vol.- No.122

미국 무기체계 획득과 연구개발의 문제점(1)

김기석,Kim, Gi-Seok 한국방위산업진흥회 1988 國防과 技術 Vol.- No.107

병계(病鷄)로부터 분리(分離)한 Pseudomonas aeruginosa의 생화학적(生化學的) 성상(性狀)과 항균성(抗菌性) 약제내성(藥劑耐性)

김기석,남궁선,모인필,박근식,오경록,Kim, Ki-Seuk,Namgoong, Sun,Mo, In-Pil,Park, Keun-Sik,Oh, Kyoung-Rok 대한수의학회 1982 大韓獸醫學會誌 Vol.22 No.2

Biochemical and antimicrobial susceptibility tests were conducted on 40 strains of Pseudomonas aeruginosa originated from diseased chicken submitted for diagnosis to this Institute during 1978-80. An extensive study of the biochemical properties revealed that the tested strains can be identified with Pseudomonas aeruginosa. Antibiogram showed that all the strains were susceptible to gentamicin, colistin and amikacin but resist to nitrofurantoin, trimethoprim+sulfamethoxazole, ampicillin, methicillin and kanamycin, and had varing degreed of resistance to other antimicrobials including carbenicillin, sulfomamides, neomycin, streptomycin, tetracycline and chloramphenicol. Three of the most frequent resitance patterns observed were FM SXT AM ME KM CM TC SM NE SSS Pattern, FM SXT AM ME KM CM TC SM NE SSS CB Pattern and FM SXT AM EKM CM TC SM Pattern, and these resistance patterns contained 72.5% of the tested strains.

황우-소련의 화학무기 사용실태 추적기(하)

김기석,Kim, Gi-Seok 한국방위산업진흥회 1986 國防과 技術 Vol.- No.84