http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Water vapor removal using CA/PEG blending materials coated hollow fiber membrane
Kim, KeeHong,Ingole, Pravin G.,Yun, SangHee,Choi, WonKil,Kim, JongHak,Lee, HyungKeun John WileySons, Ltd 2015 Journal of chemical technology and biotechnology Vol.90 No.6
<P><B>Abstract</B></P><P><B>BACKGROUND</B></P><P>In this study, a polyethersulfone composite hollow fiber membrane was used for the separation of water vapor from mixed gas. For improvement of the separation properties, the fabricated membrane was coated with cellulose acetate (CA) and polyethylene glycol (PEG).</P><P><B>RESULTS</B></P><P>Experiments on the permeation of water vapor and N<SUB>2</SUB> gas mixture were performed to observe membrane behavior as a function of the coating conditions, such as the composition and molecular weight of PEG. The water vapor permeance and selectivity of water vapor/N<SUB>2</SUB> improved from 68.5 GPU to 444.1 GPU and from 76.1 to 175.5, respectively, using 5 wt% PEG 2000 blended coating solution.</P><P><B>CONCLUSION</B></P><P>An increase in the PEG content and molecular weight of the coating solution affected the permeance and selectivity due to the hydrophilicity of PEG and the structural changes of the coating layer. © 2014 Society of Chemical Industry</P>
건조 및 젖은 노면에서 자동차의 급제동과 마찰계수의 변화
김기남(Keenam Kim),문원길(Wonkil Moon),김민석(Minseok Kim),김민호(Minho Kim),옥진규(Jinkyu Ok),박수진(Sujin Park),유완석(Wansuk Yoo) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Skid marks and friction coefficients are utilized to investigate the velocity and motion of vehicles, and the precise friction coefficients for various conditions of roads are necessary, for traffic accident recovery. In this study, The skid mark tests on dry and wet asphalt pavement were executed, and the friction coefficients were obtained. A passenger car with new tires and non-contact optical velocimeters were set up for the tests. Modified friction coefficients and methodology to understand the more exact velocity and braking of the vehicle were suggested.
Hye Duck Yeom,Young-Min Kim,Sung Bae Lee,Shinhwa Noh,Sanung Eom,Hyunah Kim,Wonkil Kim,Jae Hwan Lee,Hyunsu Bae,Jun-Ho Lee,H. Bae,J. H. Lee 대한독성 유전단백체 학회 2017 Molecular & cellular toxicology Vol.13 No.3
Alisma Rhizome is a known tradition medication, which has been used for its diuretic, hypolipidemic, anti-diabetic, and anti-inflammatory purposes for thousands of years. The primary compounds of Alisma Rhizome are protostane type triterpenes, such as Alisols A, B or C. We previously demonstrated that Alisol derivatives (Alisols A, B, and C) have inhibitory effects on 5-hydroxytryptamine 3A (5-HT3A) currents1. In this study, we tested the effects of a new triterpene, Alisol-F, on human 5-HT3A and α3β4 nicotinic acetylcholine (nACh) receptor channel currents by using Xenopus oocytes expressing these channels. Co-application of Alisol-F inhibited 5-HT3A and α3β4 nACh receptor-mediated inward peak currents. The inhibitory effect of Alisol-F on 5-HT and ACh-induced inward peak currents occurred in a reversible and concentration- dependent manner. The half maximal inhibitory concentrations (IC50) of Alisol-F were 79.4±11.0 and 21.2±6.0 μM for the 5-HT3A and α3β4 nACh receptors, respectively. In addition, the inhibition of I5-HT and IACh by Alisol-F occurred noncompetitive and voltage insensitive manner. Taken together, these results show that Alisol-F may regulate 5-HT3A and α3β4 nACh receptors channel expressed in Xenopus oocytes.
Lee, Sung Bae,Noh, Shinhwa,Yeom, Hye Duck,Kim, Hyunah,Kim, Wonkil,Kim, Yoon Suh,Bae, Hyunsu,Lee, Jun-Ho Kyung Hee Oriental Medicine Research Center, Kyung 2016 Oriental Pharmacy and Experimental Medicine Vol.16 No.4
Alisma Rhizomes is used as a diuretic, hypolipidemic, anti-diabetic and anti-inflammatory agent in traditional East-Asian medicine. In this study, we tested the effect of Alisma Rhizomes on the <TEX>${\alpha}3{\beta}4$</TEX> nicotinic acetylcholine (nACh) receptor channel current in Xenopus oocytes. The acetylcholine-induced inward peak current (<TEX>$I_{ACh}$</TEX>) was measured with the two-electrode voltage-clamp technique. This experiment shows that the <TEX>${\alpha}3{\beta}4$</TEX> nACh receptor cRNA injected into oocytes followed by co-application with Alisma Rhizomes inhibited <TEX>$I_{ACh}$</TEX> in a noncompetitive or voltage insensitive condition. The half maximal inhibitory concentration (<TEX>$IC_{50}$</TEX>) of Alisma Rhizomes was <TEX>$12.5{\pm}3.4{\mu}g/ml$</TEX> and the Vmax was <TEX>$55.4{\pm}4.7$</TEX>. Protostane-type triterpenoids are the main active ingredient of Alisma Rhizomes (Alisol A, Alisol B, Alisol B 23-acetate, Alisol C 23-acetate). The respective IC50 values of Alisol A, Alisol B, Alisol B 23-acetate, and Alisol C 23-acetate were <TEX>$1.7{\pm}0.1$</TEX>, <TEX>$2.8{\pm}0.5$</TEX>, <TEX>$2.6{\pm}0.7$</TEX> and <TEX>$3.5{\pm}0.3{\mu}M$</TEX> in the <TEX>${\alpha}3{\beta}4$</TEX> nACh receptor expressed in Xenopus oocytes. Altogether, our research shows that protostane-type triterpenoids may modulate the <TEX>${\alpha}3{\beta}4$</TEX> nACh receptors expressed in oocytes in a reversible, concentration dependent and non-competitive manner. Furthermore, this modulation of the nACh receptor activity by protostane-type triterpenoids could underlie the pharmaceutics actions of Alisma rhizome.
전방향성 로봇의 스프링과 댐퍼 선정을 위한 ADAMS 시뮬레이션
문원길(Wonkil Moon),김현우(Hyunwoo Kim),유완석(Wansuk Yoo),허남(Nam Huh) 한국자동차공학회 2007 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
An unmanned autonomous driving robot for factory automation has individual four-wheels which is driven by electronic motors. The robot has individual four-steering system. Low-speed maneuverability is improved by steering four-wheels. In this paper, to determine the spring stiffness and the damping ratio of a unmanned autonomous driving robot, Bump passing and steady state cornering simulations were carried out with the ADAMS program.
Hyungtae Kim,성시찬,장윤희,Wonkil Jung,이형두,Ji Ae Park,허업 대한흉부외과학회 2011 Journal of Chest Surgery (J Chest Surg) Vol.44 No.6
The tetralogy of Fallot (TOF) with pulmonary atresia (PA) and a ductus-dependent pulmonary circulation (no major aorto-pulmonary collateral arteries (MAPCAs)) has been treated with staged repair or primary repair depending on the preference of surgeons or institutions. We evaluated the 19-year outcome of staged repair for this anomaly to find out whether our surgical strategy should be changed. Materials and Methods: Forty-four patients with TOF/PA with patent ductus arteriosus (PDA) who underwent staged repair from June 1991 to October 2010 were included in this retrospective study. The patients with MAPCAs were excluded. The average age at the first palliative shunt surgery was 40.8±67.5 days (range: 0∼332 days). Thirty-one patients (31/44, 70%) were neonates. The average weight was 3.5±1.6 kg (range: 1.6∼8.7 kg). A modified Blalock-Taussig (BT) shunt was performed in 38 patients, classic BT shunt in 4 patients, and central shunt in 2 patients. Six patients required concomitant procedures: pulmonary artery angioplasty was performed in 4 patients, pulmonary artery reconstruction in one patient, and re-implantation of the left pulmonary artery to the main pulmonary artery in one patient. Four patients required a second shunt operation before the definitive repair was performed. Thirty-three patients underwent definitive repair at 24.2±13.3 months (range: 7.3∼68 months) after the first palliative operation. The average age at the time of definitive repair was 25.4±13.5 months (range: 7.6∼68.6 months) and their average weight was 11.0±2.1 kg. For definitive repair, 3 types of right ventricular outflow procedures were used: extra-cardiac conduit was performed in 30 patients, trans-annular patch in 2 patients, and REV operation in 1 patient. One patient was lost to follow-up after hospital discharge. The mean follow-up duration for the rest of the patients was 72±37 months (range: 4∼160 months). Results: Ten patients (10/44, 22.7%) died before the definitive repair was performed. Four of them died during hospitalization after the shunt operation. Six deaths were thought to be shunt-related. The average time of shunt-related deaths after shunt procedures was 8.7 months (range: 2 days∼25.3 months). There was no operative mortality after the definitive repair, but one patient died from dilated cardiomyopathy caused by myocarditis 8 years and 3 months after the definitive repair. Five-year and 10-year survival rates after the first palliative operation were 76.8% and 69.1%, respectively. Conclusion: There was a high overall mortality rate in staged repair for the patients with TOF/PA with PDA. Majority of deaths occurred before the definitive repair was performed. Therefore, primary repair or early second stage definitive repair should be considered to enhance the survival rate for patients with TOF/PA with PDA.
ATO-ALL이 인간유래 피부 각질형성세포인 HaCaT 세포에서 피부재생에 미치는 효과
신윤민,이원길,김승형 大田大學校 附屬 韓方病院 2019 惠和醫學 Vol.28 No.2
Objectives : Atopic dermatitis is an irritable skin disease accompanying rash and itching leading to impaired skin barrier. ATO-ALL is an ethanol extract of natural products comprising 12 herbs and effective on atopic dermatitis. In this study, we aimed to propose that the effect of ATO-ALL on skin regeneration in human keratinocyte cell line, HaCaT cells. Methods : To evaluate the skin regenerating effects of ATO-ALL, scratch wound healing assay, bromodeoxyuridine (BrdU) assay, and propidum iodide (PI) assay were performed using cultured HaCaT cell line. Result : Scratch wound healing assay showed that ATO-ALL was able to enhance the gap filling activity more than 2-fold at 7 ppm concentration compared with control group. BrdU assay demonstrated that ATO-ALL treatment increased the de novo cell proliferation in a dose-dependent manner. Finally, PI assay indicated that the cell cycle of HaCaT cells was modulated by ATO-ALL treatment. Conclusions : These results suggested that ATO-ALL may have skin regenerating effects by increasing cell proliferation via cell cycle regulation. Taken together, ATO-ALL is supposed to have a potential on regeneration of damaged skin or functional disease including atopic dermatitis.
Ji, Hyunjin,Yi, Hojoon,Wonkil, Sakong,Kim, Hyun,Lim, Seong Chu IOP 2019 Nanotechnology Vol.30 No.34
<P>Compared to the silicon device whose performance is severely degraded due to the pin-holes and channel inactive space when the channel thickness is less than 1 nm, despite monolayer transition-metal dichalcogenides being the most stable structure to be used as a two-dimensional semiconductor material, precise analysis of the double-gate (DG) field-effect transistor (FET) device structure has hardly been performed thus far. Hence, we analyzed the device operation characteristics of single-gate and DG sweeps in a monolayer MoS<SUB>2</SUB> DG FET structure, where the interfacial carrier behavior is distinguished from both gates by the different gate dielectric materials at the top and bottom. The synchronized DG sweep operation with biasing of <I>V</I> <SUB> <I>TG</I> </SUB> and <I>V</I> <SUB> <I>BG</I> </SUB> (=10 <I>V</I> <SUB> <I>TG</I> </SUB>) increased the carrier mobility by a factor of 4.85 compared with the independent DG sweep. Direct-current analysis and low-frequency noise modeling indicate that the device performance improves under equivalent gate voltages from both sides, because the device operates in a low vertical electric field and the interfacial carrier fluctuation effect is significantly reduced.</P>