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졸-겔법으로 성장시킨 바나듐이 도핑된 ${Bi_4}{Ti_3}{O_{12}}$ 박막의 미세구조 및 전기적 특성
김종국,김상수,최은경,김진흥,송태권,김인성,Kim, Jong-Guk,Kim, Sang-Su,Choe, Eun-Gyeong,Kim, Jin-Heung,Song, Tae-Gwon,Kim, In-Seong 한국재료학회 2001 한국재료학회지 Vol.11 No.11
$Bi_{3.99}Ti_{2.97}V_{0.03}O_{12}$ (BTV) thin films with 3 mol% vanadium doping were Prepared on $Pt/Ti/SiO_2/Si$ substrate by sol-gel method. X-ray diffraction analysis indicated that single-phase layered perovskite were obtained and preferred orientation was not observed. Under the annealing temperature at $600^{\circ}C$, the surface morphology of the BTV thin films had fine-rounded particles and then changed plate-like at $650^{\circ}C$ and $700^{\circ}C$. The remanent polarization $(2P_r)$ and coercive field $(2E_c)$ of $700^{\circ}C$ annealed BTV thin film were 25 $\mu$C/cm$^2$ and 116 kV/cm, respectively. In addition, BTV thin film showed little polarization fatigue during $10_9$ switching cycles. These improved ferroelectric properties were attributed to the increased rattling space and reduced oxygen vacancies by substitution $Ti^{4+}$ ion (68 pm) with smaller $V^{5+}$ ion (59 pm). The dielectric constant and loss were measured 130 and 0.03 at 10 kHz, respectively.
김종국,이범진,Kim, Chong-Kook,Lee, Bum-Jin 대한약학회 1988 약학회지 Vol.32 No.3
We measured the rate of water transfer across the isolated small intestine of the rat in Wiseman apparatus using tritiated water ($^3H_2O$) in drinking beverages such as electrolytes solution, fruit juice, carbonated water and barley water. Initial transfer rate of water using four beverages were determined: Electrolytes solution is the fastest and followed by barley water, carbonated water and fruit juice.
제산제, 소화효소제 및 생약제를 함유한 시판 복합 소화효소제의 효력시험(II)-소화력시험-
김종국,장정윤,나운용,Kim, Chong-Koo,Jang, Jung-Yun,Lah, Woon-Young 한국약제학회 1990 Journal of Pharmaceutical Investigation Vol.20 No.4
The activities of s-amylase, ${\alpha}-amylase$ and protease of three combination products containing digestive enzymes, antacids and herbal drugs on the Korean market were estimated. The effects of antacids and herbal drugs on the activities of digestive enzymes were investigated. Starch-saccarifying activity of s-amylase, starch-dextrinizing activity of ${\alpha}-amylase$ and protein-peptic activity of protease were estimated by Somogy, Mc'Credy, and Casein-Folin method, respectivley. The optimal pH of s-amylase, ${\alpha}-amylase$ and protease were pH 5.0, 4.8 and 7.0, rcspectively. The digestive activities at optimal pH continued about eight hours. The digestive activities of individual enzymes were reduced to 40-90% by antacids and were affected somewhat positively or negatively by herbal drugs. Enzyme activities of the combination products were also affected by pH and reaction time.
김종국,Kim, Chong-Kuk 대한화학회 1961 대한화학회지 Vol.5 No.1
Microgram quantities of thallirum in meteorites, rocks, minerals, alloys and biological samples have been analyzed by rapid neutron activation analysis. A l0-minute radiochemical separation procedure coupled with a gas-flow proportional detector for 4.2-minute half life measurement and a gamma or beta scintillation detector placed in close proximity to the sample permitted detection of the 4.2-min Tl206. Samples were irradiated for 10-minutes at a thermal neutron flux of approximately $0.95{\times}10^{11}$ neutron-$cm^{-2}-sec^{-1}.$ The low limits of detection was about $10^{-7}$ gm of thallium.
은행잎엑스 수용액 중 Gingkoflavonglycoside의 안정성
김종국,박만기,이은진,황성주,Kim, Chong-Kook,Park, Man-Ki,Lee, Eun-Jin,Hwang, Sung-Joo 한국약제학회 1989 Journal of Pharmaceutical Investigation Vol.19 No.4
To formulate the stable preparation of Gingko extract injection and to evaluate the stability of the preparation, Gingko extract aqueous solutions having various pH values were prepared and the stability of ginskoflavonglycoside (GFG) was investlfated by high performance liquid chromatography. The stability of GFG decreased as pH increased, while the water solubility of Gingko extract decreased as pH decreased. The optimal pH of the Gingko extract aqueous solution was found to be pH 6.5. The shelf life $(T_{90%})$ of the Gingko extract aqueous solution of pH 6.5 at $20^{\circ}C$ was extrapolated to be four years.
김종국,Kim, Jong Kouk 국제문화기술진흥원 2022 The Journal of the Convergence on Culture Technolo Vol.8 No.6
In this study, the virtual exhibition using 3D architectural space was analyzed in terms of the viewer's experience. For this purpose, the analysis items of the virtual architectural space include whether the actual architectural space is reproduced, the introduction of surreal elements, the degree of freedom of movement and circulation, the level of photorealism of spatial expression, the level of reproduction of the exhibits and information provision method, and the interaction with other participants. Six virtual exhibition projects designed by a well-known architect were selected and analyzed. Three directions were found through the analysis. First, even when designing a virtual exhibition space with a high degree of freedom, there is a tendency to present a familiar architectural environment. Second, the current method of creating a virtual architectural space is that the method using a 360-degree rendering image and the method using a game engine coexist with pros and cons. Third, the interaction between participants in the virtual exhibition is implemented only by using a game engine. It is expected that the virtual space production environment using the game engine to be developed will become more advantageous in the future.