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Oligo (ethylene oxide) Side Chain을 갖는Poly(N-substituted urethane)의 전기화학적 특성연구
허재웅,권정옥,노시태 한국공업화학회 2002 한국공업화학회 연구논문 초록집 Vol.2002 No.0
Urethane의 NH group을 N-substitution하여 Oligo (ethylene oxide) Side Chain을 갖는 Poly(ethylene oxide) Poly(N-substitued urethane)을 합성하고 이온전도특성과 전기화학적 특성에 대하여 연구하였다. Oligo (ethylene oxide) Side Chain의 composition, salt concentration 및 salt 종류의변화에 따른 열적 특성은 DSC (Differential Scanning Calorimeter) 와 TGA (Thermal Gravimetric Analyzer) 로 고찰 하였으며, 이온전도특성은 sus / polymer electrolyte / sus cell을 구성하여 AC impedance method로 측정하였다. Electrochemical stability window는 sus / SPE / Li cell에서 Linear Sweep Voltammetry로 측정하였고, 계면저항은 Li / SPE / Li cell을 구성하고, AC impedance analyzer 을 이용하여 온도와 시간의 함수로 open circuit condition에서 측정하였다.
허재웅,최희성,노시태 한국공업화학회 2001 한국공업화학회 연구논문 초록집 Vol.2001 No.-
Today, ultraviolet cured system has rapidly expanded into numerous commercial applications,in-cluding binders for magnetic media. Also, water based-coatings have gained widely interests, because they can derease air pollution, reduce risks of fire, and improve aspects of occupational health and safety. For the reason, we synthesized 1,1,1-trimethylol propane (TMP) with cis-1,2,3,6-tetrahydrophthalic anhydride (THPA) through the esterification method. This reactant has a pendant anionic group and reactive double bond in the pendant cyclic ring. Then, a water-based urethane acrylate was prepared from isophrone diisocyanate (IPDI),2-hydroxyethyl acrylate (2-HEA), a low molecular weight diol bearing pendant carboxylic acid. Therefore, water-based urethane acrylate containing carboxylic acid group was synthesized by stepwise procedure. The water-based urethane acrylate crosslinking agent containing unsaturated group was conformed with Gel Permeation Chromatography (GPC). Also, the increase of the rubbery plateau modulus and the shift of the Tg to a higher temperature were observed by dynamic mechnical analsis (DMA).
전해질 농도와 식각시간에 따른 비귀금속합금의 표면조도 변화
허재웅,전영찬,정창모,임장섭,Heo, Jae-Woong,Jeon, Young-Chan,Jeong, Chang-Mo,Lim, Chang-Sub 대한치과보철학회 2000 대한치과보철학회지 Vol.38 No.2
The purpose of this study was to evaluate the surface roughness of Ni-Cr-Be alloy($Verabond^{(R)}$, Aalba Dent Inc., USA) according to electrolyte concentration and etching time. Total of 150 metal specimens ($12{\times}10{\times}1.5mm$) composed of 5 polisded specimens, 5 sandblasted specimens, 140 etched specimens were prepared. Etched groups were divided into 28 groups by the $HClO_4$ concentrations(10, 30, 50, 70%) and etching times(15, 30, 60, 120, 180, 240, 300 seconds). The mean surface roughness(Ra) and the etching depth were measured with Optical 3-dimensional surface roughness measuring machine(Accura 1500M, Intek Engineering Co., Korea) and observed under SEM. The results obtaind were as follows: 1. Surface roughness(Ra) and etching depth were affected by the order of etching time, electrolyte concentration, and their interaction(P<0.05). 2. Surface roughness(Ra) and etching depth were increased with etching time in 10%, 30% electrolyte concentrations, but they had no significant difference with etching time in 70% (P<0.05). 3. Surface roughness(Ra) and etching depth decreased in the order of 30, 10, 50, 70% electrolyte concentrations from 120 seconds etching time(P<0.05). 4. The remarkable morphologic changes in etched surface were observed along the grain boundaries in 15, 30 seconds of 10%, 30% concentrations and the morphologic changes could be denoted in the grains themselves as well as along the boundaries with the lapse of time. Even though the noticeable morphologic changes also took place in etched surface with 50% concentration, the degree of changes were less than that of changes with 10%, 30%. However, there were little morphologic changes with 70% concentration regardless of etching time. 5. Surface roughness(Ra) of sandblasting group with $50{\mu}m\;Al_2O_3$ had no significant difference with 30%-30 seconds etched group(P<0.05).
허재웅(Jaewoong Hur),이교일(Kyoil Lee),정규홍(Kyuhong Jung),김관수(Kwansoo Kim) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_2
Nowadays, many of passenger cars use automatic transmission as power transmission control devices because of its convenience. So many intensive researches for automatic transmission of passenger cars has been performed. In case of construction vehicle, drivers must do many tasks during the construction operation such as working of boom, forward/backward driving, and shifting. So the amount of work done is dependent of driver's dexterity. Due to the this reason, the adoption of automatic transmission has increased in the construction vehicle. In this paper, the automatic transmission shift controller in construction vehicle is developed. The mathematical model of automatic transmission is established and the shifting simulation program is developed. The hardware and software for shift controller is designed and the performance of designed controller is verified by some experiments.
불안정형 관동맥질환 환자에서 주요 심혈관 사건의 예측 인자로서의 심근 Troponin 1 및 Myoglobin 에 관한 연구
허재웅(Jae Woong Hur),김경현(Kyung Hyun Kim),하영준(Young Jun Ha),박찬수(Chan Su Park),서우종(Woo Jong Seo),조영재(Yeong Jae Cho),차경우(Keung Woo Cha),남시현(Si Hyun Nam),김종연(Jong Yeon Kim) 대한내과학회 2001 대한내과학회지 Vol.61 No.5
N/A Background: Patients with unstable angina or non Q wave myocardial infarction still have an elevated risk for subsequent cardiac events. Therefore early assessment of the risk of future cardiac events is important. In this study, prognostic value of troponin I and myoglobin was evaluated and compared with other known early available risk indicators. Methods: Serum troponin I and myoglobin were measured at presentation and 8 hours, 16 hours, and 24 hours thereafter in 126 patients with unstable angina (n=70) or non Q myocardial infarction (n=56) from Jan 1998, through Feb 2000. Echocardiography was performed with calculation of wall motion score index. The incidence of cardiac death or myocardial infarction was compared between patients with normal troponin I, myoglobin and abnormal ones, respectively. Results: (1) At 6 months, 1 death (2.2%) and 1 myocardial infarction (2.2%) occurred in the 45 unstable angina patient s with normal troponin I compared with 3 deaths (12.0%) and 8 myocardial infarctions (32.0%) in the 25 unstable angina patient s with elevated troponin I. (2) At 6 months, 1 death (1.7%) and 3 myocardial infarctions (5.2%) occurred in the 58 unstable angina patients with normal myoglobin compared with 3 deaths (25.0%) and 6 myocardial infarctions (50.0%) in the 12 unstable angina patient s with elevated myoglobin. (3) When the analysis was limited to patients with normal baseline troponin I (≤0.4 ng/ dl: n=45), increased myoglobin level remained significantly associated with increased incidence of cardiac deaths or myocardial infarction compared with normal myoglobin level (16.7% vs 0%). (4) Together with age, diabetes, wall motion score index, troponin I and myoglobin levels were identified as independent prognostic variables for myocardial infarction or cardiac death in a multivariate logistic regression analysis. (5) The maximal troponin I and myoglobin value obtained during the first 24 hours provides independent and import ant prognostic information regardless of whether the patient is classified as having unstable angina or non Q wave myocardial infarction. Conclusion: The maximum troponin I and myoglobin obtained during the first 24 hours provides independent and important prognostic information in patients with unstable angina or non Q wave myocardial infarction. (Korean J Med 61:496- 505, 2001)