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현시선호 데이터와 선호의식 데이터 비교를 통한 국제선 항공이용자의 항공사 선택에 관한 연구
이용일(Lee, yong ill) 한국문화관광학회 2003 문화관광연구 Vol.5 No.2
The research purpose is to study the airlines choice behavior of international trips departured from Korea. The study identified the major factors influential flight choice in the market and their relative importance by constructing logit modes. Separate logit models have been calibrated with RP data and with SP data. This research was studied through analysing stated Preference(SP) data as well as Revealed Preference(RP) data. The major findings of the study are followed: suggested various and differed service model, established highly differed marketing strategic, create the suitable service through market, devised characters for each destination, differed airlinechoice behavior for each tour destination. In conclusion, this research has significance in the fact that the airline company must be realized the needs and wants correctly and airline service qualities about theirs consumers.
새로운 트리아자크라운 이온교환체의 합성과 그의 이온교환 특성
김동원,정용순,김창석,최기영,이용일,홍춘표,Kim, Dong Won,Chung, Yong Soon,Kim, Chang Suk,Choi, Ki Young,Lee, Yong Ill,Hong, Choon Pyo 대한화학회 1995 대한화학회지 Vol.39 No.5
The triazacrown compound, 1,7-dioxa-4,10,13-triazacyclopentadecane trihydrobromide salt (Na3O2-3HBr) was synthesized. And this compound was used to synthesize the new ion exchanger, which combined with Merrifield peptide resin. This new ion exchanger had a capacity of 3.2 meq/g dry resin. And the distribution coefficients of alkali and alkaline earth metal ions on this ion exchanger in the various concentrations of hydrochloric acid were determined. The ion exchange behaviors of alkali and alkaline earth metal ions in the various hydrochloric acid concentrations are, also, discussed. 트리아자크라운 화합물, 1,7-dioxa-4,10,13-triazacyclopentadecane trihydrobromide $salt(Na_3O_2-3HBr)$를 합성하였다. 그리고 이 화합물을 Merrifield peptide resin에 결합시켜 새로운 이온교환체를 만들었다. 이 새로운 이온교환체의 이온교환용량은 3.2 meq/g이었다. 그리고 이 이온교환체에 대한 알칼리 및 알칼리 토금속 이온들의 분포계수를, 여러 농도의 염산 용액 중에서 측정하였다. 또한 여러 염산 농도하에서의 알칼리 및 알칼리 토금속 이온들의 이온교환작용을 논의하였다.
변형시킨 polysulfones의 개선된 열적특성에 관한 연구
박승건,이용일 昌原大學校 基礎科學硏究所 2002 基礎科學硏究所論文集 Vol.14 No.-
Polysulfone(PSF)는 비결정성 수지로서 수축이나 휨이 극히 작고 또 높은 내열성, 강인한 기계적 성질을 가지고 있어 정밀성형용Engineering plastic 극히 우수한 재료이다.이Polysulfone(PSF)에 electron-withdrawing group과 electron-donating group을 치환 시켜을 때 이 물질들이 Polysulfone(PSF)의 열적안정도에 미치는 영향을 TermoGravimetry Analyzer(TGA)와 Differential Scanning Calorimeter(DSC)을 사용하여 비교 조사하였다.Polysulfone(PSF)의 열분해 온도(air, argon조건하에서)는 대략 400∼550℃이다.이 때 Polysulfone(PSF)에 electron-withdrawing group을 치환시키면 열분해 온도가 증가함을 볼수있고, electron-donating group을 치환시키면 열분해 온도가 감소함을 볼 수 있었다.
가스크로마토그래피/질량분석법에 의한 최적화 유도화 과정을 통한 Atrazine의 새로운 분석방법 개발
박승건,김승진,유영재,이용일 昌原大學校 基礎科學硏究所 2003 基礎科學硏究所論文集 Vol.15 No.-
Pesticides, with their high degrees of toxicity constitute a very impOrtant group target compound in environment samples. The use of many pesticides has been restricted or even banned while several years bemuse of their long residue times, persistence and bio-accumulation. Atrazine was derivatized using a single-step procedure by N,O-bis(trimathylsilyl)-acetamide acetonitrile in various solvent systems such as methanol, ethyl acetate, pyridine, and tetrahy&ofuran(Tl). The variables selected for study were the amount of reagents, the temperature and reaction times. The elelctron impact ionization mass spectra of the resulting derivatives are acquired and properly interpreted. Under the optinaized gas chromatographic conditions employed, an enhanced (3 times) peak height and an improved peak shape without any tailing. The purpose of this study was the development and application of GC-MS method for efficient analysis of atrazine.
Lee, Won-bae,Lee, Su-kyung,Yoo, Young-Jae,Lee, Yong-Ill 昌原大學校 基礎科學硏究所 2002 基礎科學硏究所論文集 Vol.14 No.-
Spatially resolved laser-induced breakdown spectroscopy(LIBS) was applied to indirect analysis of chemical species in liquid samples. Recently, our research group suggested a shockwave excitation mechanism in the plasma and developed for precise indirect quantitative analysis of liquid samples.This technique used an indirect excitation method by shockwave resulting from the interaction between an intense Nd:YAG laser beam(1=1064㎚,140mJ/pulse) and a ceramic reference target.The experimental apparatus was made of spray chamber equipped with heat tape(373-383K) and typical condenser to eliminate distilled water.The trace metal aerosol produced by pneumatic nebulizer equipped with spray chamber and desolvation chamber was interduced to the plasma in vertical direction to increase the collision.The characteristics of the indirect excitation method under various experimental conditions were investigated. With the use of neutral copper[Cu(Ⅰ)]lines, the emission invensity was integrated with different gas(Ar,He,N2). laser energy and so on.Under an optimal condition, analytical performances of the system were ebaluated, including dynamic range. limearity, precision , and detection limit from the consecutive measurements. Indirect trace metal analysis of Li, Mn, Cu, K, Na, Cd was carried out with LIBS technique in this work.Precision(%RSD) for the trace element was in the range 3-5% except Cadmium that is 6.49.The calibration graph for those elements show good linearity (correlation coefficient, r 0.972)in the range of 0-10㎍/g.
Han, Sang-Yun,Yoo, Young-Jae,Lee, Yong-Ill 昌原大學校 基礎科學硏究所 2001 基礎科學硏究所論文集 Vol.13 No.-
A simple, rapid and sensitive quantitation method has been developed for the determination of phenylpropanolamine in pharmaceuticals by High Performance Liquid Chromatography. A C18 reversed-phase column(150 × 4.6 mm i.d.) was used together with an isocratic mobile phase consisted of 5% methanol in 25 mM potassium dihydrogenphosphate. The mobile phase was adjusted to pH 3.0 with 1M H3PO4 and pumped at a flow rate 1.2 mL/min. The UV detection was made at 205 nm and analytical conditions were optimized, The limit of detection and quantitaction in this work were 4 ㎍/L and 14 ㎍/L, respectively. The method was applied with useful results to the determination of the phenylpropanolamine in commercial pharmaceuticals.