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자동차 Thermostat용 Wax의 제조에 관한 연구
이태형,정석진 慶熙大學校 1992 論文集 Vol.21 No.-
The component analysis of wax for detecting temperature in automobile thermostat and manufacture of it with distilllation and solvent extraction were progressed. From the lift test results of prepared samples, it was found that the solent extracted samples were in the proper range of using as a automobile thermostat. And more accurate wax could be manufactured making narrow of molecular weight distribution by high vacuum fraction distillation and acid treatments after solvent extraction from crude oil pitch.
Propylene의 氣相重合反應에서 反應因子들이 反應速度 및 立體規則性에 미치는 影響에 관한 硏究
이태형,임상윤,정석진 慶熙大學校 材料科學技術硏究所 1992 材料科學技術硏究論集 Vol.5 No.-
In order to investigate the effects of reaction factors on reaction rate, catalytic yield and stereospecific properties of polypropylene, commercial MgCl_(2) supported Ziegler-Natta catalyst was used. In the effects of reaction temperature, the polymerization rate was increased as increasing of reaction temperature until 60℃, but decreased above 60℃. This was considered as the active site of catalyst was deactivated by decomposition of transition metal-organic compound ligand at higher temperature (≥60℃) It was found that the relation between reaction pressure and catalytic yield was linear, and could derived the equation of catalytic yield with regard to reaction pressure. In the effects of cocatalyst concentration, the more cocatalyst amount, the faster polymerization rate. But reaction rate was decreased above Al/Ti mole ratio = 50. This was considered as the excess cocatalysts were adsorbed on the catalyst active sites in competition with monomers and/or reacted as a chain transfer agent which quenches the polymerization. In the effects of reaction factors on stereospecific properties, the isotactic index of polymer was increased according to temperature and has a maximum valve at 50℃. The effect of reaction pressure on isotacticity was not severe. It was commonly known that the isotactic index of polypropylene is decreased as increasing of cocatalyst concentration because the atactic site activation is increased with increasing of Al/Ti mole ratio. The electron donor(EB) was incorporated for increasing of isotactic index of polypropylene, but the more electron donor, the lower isotactic index. This was considered of isotactic site poisoning by excess electron donor.
Survey Analysis of Cough Characteristics in Chronic Respiratory Disease
( Ji-yong Moon ),( Tai Joon An ),( Hyonsoo Joo ),( Hae-in Jung ),( Hyeon-kyoung Koo ),( Sung-kyung Kim ),( Chin Kook Rhee ),( Yee Hyung Kim ),( Kyung Hoon Min ),( Deog Kyeom Kim ),( Jong-wook Shin ),( 대한결핵 및 호흡기학회 2023 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.136 No.0
Three-month Treatment Response and Exacerbation in Chronic Obstructive Pulmonary Disease
Lee, Jung Su,Rhee, Chin Kook,Yoo, Kwang Ha,Lee, Ji-Hyun,Yoon, Ho Il,Kim, Tae-Hyung,Kim, Woo Jin,Lee, JinHwa,Lim, Seong Yong,Park, Tai Sun,Lee, Jae Seung,Lee, Sei Won,Lee, Sang-Do,Oh, Yeon-Mok The Korean Academy of Medical Sciences 2015 JOURNAL OF KOREAN MEDICAL SCIENCE Vol.30 No.1
( Jung Su Lee ),( Chin Kook Rhee ),( Kwang Ha Yoo ),( Ji Hyun Lee ),( Ho Il Yoon ),( Tae Hyung Kim ),( Woo Jin Kim ),( Jin Hwa Lee ),( Seong Yong Lim ),( Tai Sun Park ),( Jae Seung Lee ),( Sei Won Lee 대한결핵 및 호흡기학회 2014 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.118 No.-
Background: To investigate relationships between acute exacerbation and FEV1improvement after treatment with combined long-acting beta-agonist(LABA) and inhaled corticosteroid (ICS) in patients with chronic obstructive pulmonary disease (COPD). Methods: A total of 137 COPD patients were classified as responders or nonresponders according to FEV1 improvement after 3 months of LABA/ICS treatment. Exacerbation occurrence in these two subgroups was compared over a period of 1 year. Results: Seventy-seven of the 137 COPD patients (56.2%)were classified as responders and 60 (43.8%) as nonresponders. Acute exacerbations occurred in 23 patients (29.9%) in the responder group and in 28 patients (46.7%) in the nonresponder group (P = 0.044). FEV1 improvement after LABA/ICS treatment was a significant prognostic factor for fewer acute exacerbations in a multivariate Cox proportional hazard model adjusted for age, sex, FEV1, smoking history, 6min walk distance, body mass index, exacerbation history in the previous year, and dyspnea scale. Conclusions: Three-month treatment response to LABA/ICS might be a prognostic factor for the occurrence of acute exacerbation in COPD patients.
( Jung Su Lee ),( Chin Kook Rhee ),( Kwang Ha Yoo ),( Ji Hyun Lee ),( Ho Il Yoon ),( Tae Hyung Kim ),( Woo Jin Kim ),( Jin Hwa Lee ),( Seong Yong Lim ),( Tai Sun Park ),( Jae Seung Lee ),( Sei Won Lee 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1
Background: To investigate relationships between acute exacerbation and FEV1improvement after treatment with combined long-acting beta-agonist(LABA) and inhaled corticosteroid (ICS) in patients with chronic obstructive pulmonary disease (COPD). Methods: A total of 137 COPD patients were classified as responders or nonresponders according to FEV1 improvement after 3 months of LABA/ICS treatment. Exacerbation occurrence in these two subgroups was compared over a period of 1 year. Results: Seventy-seven of the 137 COPD patients (56.2%)were classified as responders and 60 (43.8%) as nonresponders. Acute exacerbations occurred in 23 patients (29.9%) in the responder group and in 28 patients (46.7%) in the nonresponder group (P = 0.044). FEV1 improvement after LABA/ICS treatment was a significant prognostic factor for fewer acute exacerbations in a multivariate Cox proportional hazard model adjusted for age, sex, FEV1, smoking history, 6min walk distance, body mass index, exacerbation history in the previous year, and dyspnea scale. Conclusions: Three-month treatment response to LABA/ICS might be a prognostic factor for the occurrence of acute exacerbation in COPD patients.
Characterization of Heat Reformed Naphtha Cracking Bottom Oil Extracts
Jong-Hyun Oh,Jae-Young Lee,Seok-Hwan Kang,Tai-Hyung Rhee,Seung-Kon Ryu 한국탄소학회 2008 Carbon Letters Vol.9 No.4
Naphtha Cracking Bottom (NCB) oil was heat reformed at various reforming temperature and time, and the volatile extracts were characterized including yields, molecular weight distributions, and representative compounds. The yield of extract increased as the increase of reforming temperature (360~420℃) and time (1~4 hr). Molecular weight of the as-received NCB oil was under 200, and those of extracts were distributed in the range of 100-250, and far smaller than those of precursor pitches of 380-550. Naphtalene-based compounds were more than 70% in the as-received NCB oil, and most of them were isomers of compounds bonding functional groups, such as methyl (CH3-) and ethyl (C2H5-). When the as-received NCB oil was reformed at 360℃ for 1 hr, the most prominent compound was 1,2-Butadien, 3-phenyl- (24.57%), while naphthalene became main component again as increasing the reforming temperature.