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Thallium(I)-Selective Electrodes Based on Calix[4]pyrroles
박경순,정성욱,이심성,김재상,Park, Gyeong Sun,Jeong, Seong Uk,Lee, Sim Seong,Kim, Jae Sang Korean Chemical Society 2000 Bulletin of the Korean Chemical Society Vol.21 No.9
Thallium(I) selective electrodes based on meso-alkyl substituted calix[4]pyrroles such as, meso-octamethyl-calix[4]pyrrole (L1), meso-octaethylcalix[4]pyrrole (L2) and meso-tetraspirocyclohexylcalix[4]pyrrole (L3) as sensor molecules have been pre pared and tested. The conditioned electrode (E4) incorporating L3gave best results with a wide working concentration range of 10-5.5 ~10-1 M near-Nernstian slope of 56.0 mV/decade of activity and detection limit of 10-6.0 M. This electrode exhibited a fast response time of 30 s and high selectivity over Na+ , K+ and other metal ions with only Ag+ interfering. The electrode works well in the pH range 2.0-11.0 and can be successfully employed for the determination of Tl+.This proposed electrode was also used as an indicator electrode in potentiometric titration of Tl+.
임형욱,박성준,정성욱,정의승,Lim, Hyoung-Uk,Park, Sung-Joon,Jeong, Seong-Wook,Jung, Eui-S. 대한인간공학회 2007 大韓人間工學會誌 Vol.26 No.1
As drivers spend more time in their cars, perception of driving a vehicle turns from utilizing a transportation means into residing in a personal space or even in moving office. Such a perception renders automobile manufacturers incorporate more vehicle functions, especially in-vehicle information systems As the number of system functions increases, the complexity of control and 2 types of display menus were designed after a literature review and a market analysis. With these controls and display menus, the experiment was performed to look into the difference of driver performance and preference on the integrated vehicle control type. Finally, the study suggests the integrated vehicle control type to minimize driver's cognitive load, and to use various functions efficiently. The study also discusses the practical use of the final integrated vehicle control type.
Poly(2-hydroxyethylmethacrylate)와 아미노산과의 상호작용에 관한 DSC와 TGA 열분석에 관한 연구(Ⅰ)
김의락,정봉진,정성욱,민경섭,이명재,남원모,박혜정,Kim, Ui Rak,Jeong, Bong Jin,Jeong, Sung Uk,Min, Kyung Sub,Lee, Myung Jae,Nam, Won Mo,Park, Hae Jung 대한화학회 1996 대한화학회지 Vol.40 No.6
Poly(2-hydroxyethylmethacrylate, HEMA)는 contact lens 재료물질로 사용되고, 물을 약 45퍼센트 포함하여 수화겔(hydrogel)을 만들 수 있는 고분자이다. Poly(HEMA)와 아미노산(alanine, arginine, methionine, proline, glycine, serine, lysine)과의 상호작용력을 DSC와 TGA 열분석법으로 측정한 결과 lysine, arginine, alanine의 결합성이 큼을 알 수 있었다. The interaction between poly(HEMA) which is material of contact lens containing about 45% water and amino acids (alanine, arginine, methionine, proline, glycine, serine, lysine) have been studied by using the thermal analysis methods through DSC and TGA. The experimental results of DSC and TGA were shown that lysine, arginine and alanine have the most stable interaction between poly(HEMA) and amino acids.
김관문(Kwan Moon Kim),김영석(Young Seok Kim),정성욱(Seong Uk Jeong),김성현(Sung Hyun Kim) 한국공업화학회 2002 공업화학 Vol.13 No.6
환경 친화적인 폐기물 처리 방법으로 활발한 연구가 진행되고 있는 열분해 공정은 연료유를 얻을 수 있는 장점을 가지고 있으나, 반응기내의 탄소 침적 문제로 인하여 상용화는 이루어지지 않고 있다. 반응기 내 탄소 침적체는 열분해 공정의 부산물로서 열 전달 저하 및 조업 효율을 떨어뜨리게 된다. 본 실험에서는 폐윤활유를 열분해 하였을 때 반응기 내에서 생성되는 탄소 침적체의 특성을 연구하였다. 또한 탄소 침적체의 생성을 억제하기 위하여 적절한 반응기 재질 선정 실험을 수행하였다. 철, 구리, 니켈, 알루미늄, 그리고 스테인레스 합금을 이용하여 탄소침적 현상을 최소화 할 수 있는 반응기 재질을 선정하였으며, 알루미늄 재질에서 침적체 생성이 가장 억제됨을 알 수 있었다. 기상에서의 탄소 침적 성장과정을 SEM을 이용하여 분석하고 탄소 침적체의 탄소와 수소 함량을 원소분석을 통해 알아보았다. The carbon deposition, a by-product, on the inner surface of a reactor during pyrolysis process makes the process undesirable even if pyrolysis is regarded as an environmentally benign and useful process, since it can be used to produce fuel oil as well as to recycle waste polymers. However, the aggregated carbons on the reactor wall decrease the reactor efficiency by reducing heat and mass transfer rate. In this study, to reduce the carbon deposition various reactor materials were tested and compared. The results showed that aluminum, among iron, copper, nickel, aluminum, and stainless steel alloys, was the best at reducing the coke formation on the reactor wall. Scanning Electron Microscopy (SEM) and Elemental Organic Analysis (EOA) were employed to examine the growth kinetics of carbon deposition onto the reactor wall, the morphology of coke, and the amount of carbon and hydrogen in the coke.