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허혈로 유발된 토끼의 급성 신부전에 대한 甘草(감초) 약침액 정맥 주입의 영향
김형철,김경호,이금산,김형우,임세현,임지연,김영균,조수인,Kim, Hyeong-Cheol,Kim, Gyoung-Ho,Lee, Guem-San,Kim, Hyung-Woo,Lim, Se-Hyun,Lim, Chi-Yeon,Kim, Young-Gyun,Cho, Su-In 대한약침학회 2011 Journal of pharmacopuncture Vol.14 No.4
Objectives: The present study was undergone to determine whether Glycyrrhizae Radix pharmacopuncture intravenous injection exerts beneficial effect against the ischemia-induced acute renal failure in rabbits. Methods: Rabbits were treated with Glycyrrhizae Radix pharmacopuncture via i.v., followed by renal ischemia/reperfusion. The fractional excretion of glucose and phosphate were measured and the malondialdehyde content was also determined. The morphological changes of cortical part of kidney also observed with light microscope. Results: Renal ischemia/reperfusion caused increase of the fractional excretion of glucose and phosphate in ischemia-induced animals, which was prevented by Radix Glycyrrhizae extract treatment. Ischemia/reperfusion increased lipid peroxidation, which was prevented and morphological changes also altered by Radix Glycyrrhizae pharmacopuncture administration. Conclusions: These results indicate that lipid peroxidation plays a critical role in ischemia-induced acute renal failure and Glycyrrhizae Radix pharmacopuncture exerts the protective effect against acute renal failure induced by renal ischemia/reperfusion.
김형철,이원찬,김종구,홍석진,김경미,조윤식,박성은,김진호,Kim, Hyung-Chul,Lee, Won-Chan,Kim, Jong-Gu,Hong, Sok-Jin,Kim, Kyoung-Mi,Cho, Yoon-Sik,Park, Sung-Eun,Kim, Jin-Ho 해양환경안전학회 2011 海洋環境安全學會誌 Vol.17 No.4
Based on the consideration of land based pollutant discharges from the basin and seawater quality related carrying capacity and the seawater quality improvement in receiving water bodies of Yeoja Bay where eutrophication and organic pollution are in progress, were evaluated. The permissible inflow loads of BOD, TN and TP by using the geographical features and box modelling method were estimated. As results, it is shown that the reduction rate of discharged BOD and TP loads were 39.3% and 30.8 %, respectively, however, 6.9% was estimated for TN. According to the pollutant loading in each tributary and generated load of the basin, it is given much weight on the land use group, and also was shown in discharged load estimation. This suggests that it is important to control nonpoint source pollutant such as livestock and land use groups as well as point source to contribute the proposition of the water quality improvement plan according to the characteristics of the bay. 여자만은 유기물 오염이 점차 진행되어 가고 있으며, 해역의 수질관리를 위하여 유역으로부터 유입하는 육상기인 오염물질을 GIS 기법을 이용하여 발생부하량과 배출부하량을 산정하였다. 목표수질을 달성하기 위해 해역의 환경용량을 초과하여 유입하는 육상오염물질의 양을 박스모델로 계산하여 삭감부하량과 허용유입부하량을 평가하였다. 여자만의 수질을 해역생활환경기준 I등급으로 회복하기 위한 허용부하량을 산정한 결과, 생물화학적산소요구량은 배출부하의 39.3%, 총인은 30.8%를 삭감해야 하고, 총질소의 경우 6.9%의 낮은 배출부하 삭감률을 나타내었다. 유역의 오염원 현황과 발생부하량 현황을 볼 때 토지계가 차지하는 오염부하 비중이 높고, 배출부하량에서도 가장 큰 비중을 차지하였다. 여자만의 해양환경 보호와 개선을 위해서는 육상기원 오염물질 중 점오염원 뿐만 아니라 축산계 및 토지계 부하 등 비점원 오염원에 대한 관리가 필요하다는 것을 시사한다.
전자빔 물리증착을 이용한 고체 산화물 연료전지의 제조 : I. YSZ 박막 전해질의 제조
김형철,구명서,박종구,정화영,김주선,이해원,이종호,Kim, Hyoungchul,Koo, Myeong-Seo,Park, Jong-Ku,Jung, Hwa-Young,Kim, Joosun,Lee, Hae-Weon,Lee, Jong-Ho 한국세라믹학회 2006 한국세라믹학회지 Vol.43 No.2
Electron Beam Physical Vapor Deposition (EB-PVD) was applied to fabricate a thin film YSZ electrolyte with large area on the porous NiO-YSZ anode substrate. Microstructural and thermal stability of the as-deposited electrolyte film was investigated via SEM and XRD analysis. In order to obtain an optimized YSZ film with high stability, both temperature and surface roughness of substrate were varied. A structurally homogeneous YSZ film with large area of $12\times12\;cm^2$ and high thermal stability up to $900^{\circ}C$ was fabricated at the substrate temperature of $T_s/T_m$ higher than 0.4. The smoother surface was proved to give the better film quality. Precise control of heating and cooling rate of the anode substrate was necessary to obtain a very dense YSZ electrolyte with high thermal stability, which affords to survive after post heat treatment for fabrication a cathode layer on it as well as after long time operation of solid oxide fuel cell at high temperature.
수열흡착법을 이용한 은 점코팅된 구리 나노분말의 합성과 미세조직
김형철,한재길,Kim, Hyeong-Chul,Han, Jae-Kil 한국분말야금학회 2011 한국분말재료학회지 (KPMI) Vol.18 No.6
Ag spot-coated Cu nanopowders were synthesized by a hydrothermal-attachment method (HA) using oleic acid capped Ag hydrosol. Cu nano powders were synthesized by pulsed wire exploding method using 0.4 mm in diameter of Cu wire (purity 99.9%). Synthesized Cu nano powders are seen with comparatively spherical shape having range in 50 nm to 150 nm in diameter. The oleic acid capped Ag hydrosol was synthesized by the precipitation-redispersion method. Oleic acid capped Ag nano particles showed the narrow size distribution and their particle size were less than 20 nm in diameter. In the case of nano Ag-spot coated Cu powders, nanosized Ag particles were adhered in the copper surface by HAA method. The components of C, O and Ag were distributed on the surface of copper powder.
전자빔 물리증착을 이용한 고체 산화물 연료전지의 제조: II. 단전지 성능
김형철,박종구,정화영,손지원,김주선,이해원,이종호,Kim, Hyoung-Chul,Park, Jong-Ku,Jung, Hwa-Young,Son, Ji-Won,Kim, Joo-Sun,Lee, Hae-Weon,Lee, Jong-Ho 한국세라믹학회 2006 한국세라믹학회지 Vol.43 No.5
In this paper, anode supported SOFC with columnar structured YSZ electrolyte was fabricated via Electron Beam Physical Vapor Deposition (EBPVD) method. Liquid condensation process was employed for the preparation of NiO-YSZ substrate and the high power electron beam deposition method was used for the deposition of YSZ electrolyte film. Double layered cathode with LSM-YSZ and LSM was printed on electrolyte via screen-printing method and fired at $1150^{\circ}C$ in air atmosphere for 3 h. The electrochemical performance and the long-term stability of $5{\times}5cm^2$ single cell were investigated with DC current-voltage characteristics and AC-impedance spectroscopy. According to the investigation, $5{\times}5cm^2$ sized unit cell showed the maximum power density of around $0.76W/cm^2$ at $800^{\circ}C$ and maintained the stable performance over 400 h.
김형철,Kim, Hyeong-Cheol 한국전기산업진흥회 2002 電氣産業 Vol.13 No.9
이 글은 부정경쟁방지 및 영업비밀 보호 제도를 '부정경쟁방지 및 영업비밀보호에 관한 법률'을 중심으로 소개함으로써 일상적인 기업활동에서 본법과 관련하여 발생되기 쉬운 법적인 난관 봉착을 예방하는데 보탬이 되고자 한다.
교통운영 개선을 통한 도로교통소음 저감 대안별 효과분석
김형철,정재훈,장승일,김흥만,Kim, Hyung-Chul,Jeong, Jea-Hun,Jang, Seung-Il,Kim, Heung-Man 한국음향학회 2008 韓國音響學會誌 Vol.27 No.8
급속한 도시인구의 증가와 교통량증가로 도로변 주거지역의 소음문제가 날로 심각해지고 있다. 본 연구에서는 도로교통량과 건축물의 위치와 형태를 고려한 소음수준을 평면적, 입체적으로 예측한다. 소음현황수준을 기초로 하여 소음원인 차량의 속도제어와 차종별 통행제한을 통한 변화치를 비교하여 개선방안을 도출하고자 한다. 분석결과 건물의 입체적분석보다 평면적 분석에서 소음환경기준치를 초과하는 면적의 비율이 높았고 주간보다 야간의 초과비율이 높게 나타났다. 개선방안은 하나의 방안을 실시했을 때보다 여러가지의 개선방안을 조합한 경우에 저감효과가 높게 나타났다. The noise problem became more serious by the rapid urban population growth and traffic. This study estimates the noise level considering actual traffic volume and building shape and location. Based on the state of the arts noise level, changing amount of noise that was controlled by the speed control and truck and passenger car restriction is calculated. Some conclusion is found out. The 2-D type more than 3-D type is more than over standard of noise pollution and night time's over rate is larger than day time. And in the case of various solutions are used instead of applying one solution, noise pollution is effectively reduced.