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Kim, E. Y.,Yim, H. W.,Park, C. H.,Song, K. Y. Springer International 2017 Surgical endoscopy Vol.31 No.1
<P>Among the various systemic inflammatory markers, CRP on postoperative day 4 is the most reliable predictor of PCs after gastrectomy for gastric cancer.</P>
Synthesis of anionic multichain type surfactant and its effect on methane gas hydrate formation
Kwon, Y.A.,Park, J.M.,Jeong, K.E.,Kim, C.U.,Kim, T.W.,Chae, H.J.,Jeong, S.Y.,Yim, J.H.,Park, Y.K.,Lee, J.d. Korean Society of Industrial and Engineering Chemi 2011 Journal of industrial and engineering chemistry Vol.17 No.1
This paper reports an experimental study on the effects of novel anionic multichain disulfonate surfactant on the formation of methane gas hydrate. A series of surfactants with sodium sulfonic acid groups and different hydrophobic carbon chain lengths (C<SUB>8</SUB>, C<SUB>10</SUB>, and C<SUB>12</SUB>) were synthesized, and the effects of carbon chain length and concentration on methane hydrate formation kinetics were systematically investigated. Methane hydrate formation was conducted in a magnetic stirred vessel at the constant temperature of 274.15K and in a pressure range of 3.5-4.0MPa. All surfactants showed kinetic promoting behavior for methane gas hydrate formation, and the surfactant with the shortest chain length showed the highest acceleration effect. In addition, this multichain disulfonate surfactant exhibited higher methane storage capacity than SDS (sodium dodecyl sulfate) even at lower surfactant concentration, due to its lower critical micelle concentration (CMC) and the surface tension itself of the Gemini-type multichain surfactant.
Kim, Y.H.,Hwang, J.H.,Kim, K.S.,Noh, J.R.,Choi, D.H.,Kim, D.K.,Tadi, S.,Yim, Y.H.,Choi, H.S.,Lee, C.H. Elsevier Science Publishers 2015 Journal of hepatology Vol.63 No.1
Background & Aims: Acetaminophen (APAP) overdose is a leading cause of drug-induced acute liver failure. Prolonged c-Jun N-terminal kinase (JNK) activation plays a central role in APAP-induced liver injury and growth arrest, and DNA damage-inducible 45 beta (Gadd45β) is known to inhibit JNK phosphorylation. Metformin has recently been shown to have hepatoprotective effects. The aim of the present study is to investigate whether metformin mitigates APAP-induced hepatotoxicity and to ascertain the molecular basis of this effect. Methods: We used APAP- and/or metformin-treated Gadd45β knockout (KO) mice and wild type (WT) C57BL/6J control mice. Primary mouse hepatocytes were isolated from WT and Gadd45β KO mice were used for in vitro study. Results: Metformin pretreatment protected against APAP toxicity with decreased liver damage, and inhibited APAP-induced prolonged hepatic JNK phosphorylation in WT mice. Gadd45β expression was increased after APAP treatment, and the expression of Gadd45β was further enhanced by metformin. The effects of metformin on APAP-induced liver injury and JNK phosphorylation were abolished in Gadd45β KO mice. Notably, subtoxic doses of APAP caused cell death and sustained JNK phosphorylation in Gadd45β-deficient primary hepatocytes. In parallel, APAP increased mortality, severe liver injury, and JNK activation in Gadd45β KO mice. Interestingly, metformin administered after APAP treatment protected against APAP-evoked hepatotoxicity in WT mice, but not in Gadd45β KO mice. Conclusions: This study is the first to demonstrate that metformin shows protective and therapeutic effects against APAP overdose-evoked hepatotoxicity via Gadd45β-dependent JNK regulation. Metformin would be a promising therapeutic strategy for treatment of APAP overdose.
Hong, S.,Yim, U.H.,Ha, S.Y.,Shim, W.J.,Jeon, S.,Lee, S.,Kim, C.,Choi, K.,Jung, J.,Giesy, J.P.,Khim, J.S. Pergamon Press 2016 CHEMOSPHERE - Vol.144 No.-
Bioaccessibility of toxic substances in sedimentary residual oil is a crucial factor that needs to be considered for accurate risk assessments posed by oil spills. However, information on oil weathering processes and bioaccessibility of residual oil is often not sufficient and clear. In the present study, bioaccessibility of aryl hydrocarbon receptor (AhR)-active polycyclic aromatic hydrocarbons (PAHs) in coastal sediments near the site of the Hebei Spirit oil spill (Korea, 2007) was assessed by Tenax extraction in effect-directed analysis (EDA). Sediment samples collected 6 years after the oil spill were extracted using Soxhlet or Tenax, and EDA was performed using a battery of H4IIE-luc bioassay and GC/MSD analysis. Concentrations of PAHs and alkyl-PAHs in Soxhlet extracts ranged from 210 to 53,000 μg kg<SUP>-1</SUP> dry mass. However, concentrations of PAHs and alkyl-PAHs in Tenax extracts were approximately 20-fold less compared to those in Soxhlet extracts. In Soxhlet and Tenax extracts, the major AhR-active PAHs were identified as C1-chrysene, C3-chrysene, and C4-phenanthrene. Concentrations of 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) equivalents (TEQ<SUB>PAHs</SUB>) explained 31% and 60% of the bioassay-derived TCDD-EQ concentrations in Soxhlet and Tenax extracts, respectively. Overall, bioaccessibility of PAHs and alkyl-PAHs in sedimentary residual oils depended on hydrophobicity (log K<SUB>ow</SUB>) and degree of weathering of crude oil. The results of the present study provide further evidence in support of the biological and ecological recoveries of oil spill sites.
수직원통형 빙축열조내 얼음의 외향용융과정시 전열특성에 관한 실험적 연구
김동환(D.H.Kim),김동춘(D.C.Kim),김일겸(I.K.Kim),김영기(Y.K.Kim),임장순(C.S.Yim) 한국태양에너지학회 1996 한국태양에너지학회 논문집 Vol.16 No.2
본 연구는 수직원통형 빙축열조 내에 상변하물질로서 순수한 물을 -10℃의 초기 과냉온도로 응고시킨 후, 작동유체의 입구온도를 7℃,4℃,1℃로, 작동유체의 유입방향을 상향과 하향으로 각각 변화시키면서 외향용융시켰을 경우, 시간경과에 따른 축열매질의 온도분포, 상경계면의 형상, 용융율, 용융에너지를 실험적으로 구하여 이를 비교·검토한 것이다.<br/> 작동유체의 입구온도가 7℃,4℃의 경우에는 작동유체의 유입방향이 상·하향 모두 물의 최대밀도점인 4℃ 부근에서 일시적으로 온도가 상승하지 않고 일정 시간동안 정체하는 온도정체구간이 나타났다. 또한, 용융이 진행됨에 따라 물이 축열조의 하부에 적체되고, 이에 따라 하부에서의 용융이 활발히 진행됨으로써 상경계면 형상은 전체적으로 종모양 형태의 곡선을 나타낸다. 작동유체의 입구온도가 7℃인 경우, 용융율(Vl/Vtot)과 용융에너지는 작동유체의 유입방향이 상향인 경우가 하향인 경우세어보다 크게 나타난 반면, 작동유체의 입구온도가 4℃,1℃인 경우는 7℃의 경우와는 달리 하향인 경우가 상향인 경우에서보다 큰 것으로 나타났다. This study presents experimental results of heat transfer characteristics of P. C. M. during outward melting process in a vertical cylinder. The experiment was carried out in six conditions, i. e. , three different inlet temperature (7℃, 4℃ and 1℃) and two directions of working fluid (upward and downward). Melting P. C. M. produced a bell-shaped phase change interface. When the inlet temperature was 7℃, the lower region remained at 4℃ until the temperature of upper region reached 4°C. This was due to the state of maximum density of the lower region. When the direction of the working fluid in the case of 7℃, inlet temperature, was upward, the rate of melting and the total melting energy were higher than when it's direction was downward. But the rate of melting and the total melting energy appeared higher value as it's direction was downward when the inlet temperature is 4℃ and 1℃.
멀티채널 방식에 의한 초미세 바늘 전극의 제작 및 빔 특성
임연찬,현정우,김성수,박철우,이종항,강승언 한국공작기계학회 2004 한국공작기계학회 춘계학술대회논문집 Vol.2004 No.-
An ultra-sharp tungsten electrode for field emission was manufactured by using an electrochemical etching method, and its beam characteristics were investigated. KOH and NaOH were the electrolytes used in this research, and the taper length of the tip varied form 150 μm to 250μm according to the applied voltage and the concentration of the electrolyte. The electron-beam stability was measured to be within 5% for a total emission current of 5 μA during 4 hours of operation, and the ignition voltages were found to be ~300 V. The tip radius was experimentally found to be 250A˚ from a linear fitting of Fowler-Nordheim plots, which was in remarkably good agreement with that of the image size from scanning ion-microscopy.
모멘트법을 이용한 고온초전도 마이크로스트립 패치 안테나의 입력 임피던스 해석
정동철,박경국,임성우,주철원,서용균,한병성 전북대학교 공업기술연구소 1998 工學硏究 Vol.29 No.-
Applying HTS to microstrip patch antenna, one of the most difficult problems is the impedance matching at feed point. For good impedance matching, exact solutions of input impedance must be calculated. In this paper the solutions of it were presented. To do this, using Moment method based on Ground dielectric slab Green function, we calculate the current distribution and the real part and imaginary part of input impedance.
정권범,조만호,C. J. Yim,황정남,고대홍,J.-H. Lee,M. J. Kim,N. I. Lee,Y.-S. Kim 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.48 No.4
Hf-silicate films were grown by using atomic layer deposition with Hf[N(CH3)(C2H5)]4 and SiH[N(CH3)2]3 precursors. The composition of the Hf-silicate films was excellently well controlled by using the ratio of the deposition cycles of HfO2 and SiO2 (Hf/Si). The physical and the electrical characteristics of the Hf-silicate films were compared for Hf/Si = 3/1, Hf/Si = 1/1, and Hf/Si = 1/3. The relative Hf/(Hf+Si) compositions were 58 %, 41 %, and 25 % for Hf/Si = 3/1, Hf/Si = 1/1, and Hf/Si = 1/3, respectively. The binding characteristics of the Hf-silicate films were shifted in the direction of higher binding energy with increasing of SiO2 portion, resulting in electric charging. The molecular structure of the Hf-silicate films was changed by the relative compositions of HfO2 and SiO2. In addition, the dielectric characteristics of the Hf-silicate films were directly proportional to the HfO2 portion.