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전이금속산화물에 대한 다염소치환페놀류의 흡착과 산화 (제 1 보). ${\sigma}-MnO_2$(s)의 흡착특성과 환원성 용해
윤종훈,임종완,이흥락,오상오,이선행,Jong Hoon Yun,Jong Wan Lim,Heung Lark Lee,Sang Oh Oh,Sun Haing Lee 대한화학회 1991 대한화학회지 Vol.35 No.3
수용액에서 ${\sigma}-MnO_2$(s)에 대한 다염소치환페놀류의 흡착과 산활를 조사하였다. 제안된 메카니즘중에서 ${\sigma}-MnO_2$(s)에 대한 염소치환페놀류의 흡착반응은 용액의 pH와 염소치환페놀의 농도에 의존하였다. 흡착등온선은 Langmuir등온선의 형태이었다. 흡착분배계수의 pH의존성과 염소치환페놀의 옥타놀-물 분배계수와의 직선적인 관계로부터 흡착은 연소치환페놀류의 hydrophobicity에 지배되는 것으로 보였다. ${\sigma}-MnO_2$(s)의 환원성 용해속도로부터 구한 전자전이 반응속도는 염소치환페놀류의 농도와 매질의 pH에 거의 직선적으로 의존하였다. Meta위치 염소치환페놀류의 실험적인 속도상수($K_0$)는 염소치환페녹시 라디칼의 공명효과 때문에 ortho 및 para위치는 치환체보다 크게 작았다. 이것은 흡착반응 중 이 라디칼이 생성되며, 전자전이반응이 곧 속도결정단계임을 나타내는 것이다. Adsorption and oxidation of polychlorinated phenols by suspended ${\sigma}-MnO_2$ in aqueous solution have been studied. Of the proposed mechanism, adsorption reaction of chlorophenols onto ${\sigma}-MnO_2$(s) depended upon the pH of the solution and the concentration of chlorophenol. Adsorption isotherms showed a reasonably good fit to the Langmuir isotherm. From the pH dependence of adsorption partition coefficient and the linear relationship between octanol-water partition coefficient and adsorption partiton coefficient of chlorophenol, it is estimated that adsorption is dominated by its hydrophobicity. The rate of electron transfer reaction evaluated from the rate of reductive dissolution of ${\sigma}-MnO_2$(s) depended linearly upon the concentration of chlorophenol and the pH of medium. Observed rate constants ($K_0$) of the meta-substituted chlorophenol were lower than that of the ortho-or para-chlorophenol because of resonance effect of chlorophenoxy radical. It is indicated that this radical is produced in the adsorption process and the electron transfer reaction is rate determining.
이광야 ( Lee Kwang Ya ),임종완 ( Lim Jong Wan ),홍대벽 ( Hong Dae Byuk ) 한국농공학회 2002 한국농공학회 학술대회초록집 Vol.2002 No.-
The purpose of this study is to develope a indicator for agricultural water use. Agricultural water is challenged by the increase of water use in the sectors of urbanization and industry and social pressure to use water in sustainable and environmentally sound way. The development of agricultural environment indicators is divided into 13 sectors, among which agricultural water use indicators include amount and intensity of agricultural water use, efficiency of agricultural water use, shortage or surplus of water use, water stress, etc.. Agricultural water use indicators provide basic data for sustainable and environmentally sound agricultural development, and also help policy decision makers to solve water shortage problems through water policy and water management measures by making the most of the total available water resources.
trans-Fluoroaquobis(ethylendiamine) Chromate(III) Cation 수화반응 속도에 대한 온도와 압력의 영향
오상오,이상협,임종완,Oh Sang-Oh,Lee Sang-Hyup,Lim Jong-Wan 대한화학회 1986 대한화학회지 Vol.30 No.3
착물 $trans^-[Cr(en)_2F(H_2O)]^{2+}$의 hydrolysis에 대한 속도상수를 분광광도법으로 여러가지 온도와 압력에서 측정하였다. 온도 범위는 30${\circ}C$ ~ 50${\circ}C$까지이고 압력은 1bar에서 1500bar까지 변화시켰다. 1bar, 30${\circ}C$에서 측정된 속도상수는 $2.632{\times}10^{-5}sec^{-1}$였다. 속도상수는 일정온도에서 압력이 증가함에 따라 감소하였다. 활성화 부피와 다른 활성화 파라미터들은 이러한 속도상수로 부터 계산되었다. 활성화 부피는 모두 양의 값을 가졌으며 0.447에서 3.152$cm^3$/mol내에 있고, 활성화 엔트로피는 작은 값을 가진다. 이 반응은 흡열반응이고, 실험적인 온도에서 엔탈피 지배 반응이다. The rates of hydrolysis of the complex, $trans^-[Cr(en)_2F(H_2O)]^{2+}$, have been investigated using spectrophotometric method at various temperatures and pressure. Temperature was 30${\circ}C$ to 50${\circ}C$ and pressure was varied up to 1500bar. The rate constant measured at 30${\circ}C$ is $2.632{\times}10^{-5}sec^{-1}$. The rate constants are decrease with increasing pressure at constants temperature. Activation volume and other activation parameters are calculated from these rate constants. The activation volumes are all positive and lie in the limited range 0.447 ∼ 3.152$cm^3$/mol and the activation entropies are small values. From the results, it was found that this reaction was endothermic and enthalphy controlled reaction in the experimental temperature.
이명진 ( Moung Jin Lee ),최재영 ( Jae Young Choi ),조승훈 ( Seung Hun Cho ),임종완 ( Jong Wan Lim ),이승태 ( Seung Tae Lee ),민승기 ( Seung Ki Min ) 대한외상학회 2009 大韓外傷學會誌 Vol.22 No.2
The calyceal diverticulum is a cystic cavity lined by a transitional epithelium, is encased within the renal substance, and is situated peripheral to a minor calyx, to which it is connected by a narrow channel. Both congenital and acquired factors have been suggested to explain the formation of a calyceal diverticulum. We experienced a case of a huge calyceal diverticulum that was newly developed after a renal injury. (J Korean Soc Traumatol 2009;22:264-268)
엄명철,이광야,조국헌,임종완,Eom Myung Chul,Lee Kwang Ya,Guk Guk Hyun,Lim Jong Wan 한국관개배수위원회 2004 한국관개배수논문집 Vol.11 No.1
The objective of this study is to analyze the characteristics of pollutant runoff loads on rainy days compared with dry days in the Mangyeong and Dongjin watersheds of Saemangeum tidal reclaimed area. Water samples were collected at 10 sites on the Mangye
조립성 분석을 위한 3D CAD 모델 기반 DFA 시스템
고명준(Myoung Jun Ko),임종완(Jong Wan Lim),이전일(Li Quan Ri),황다혜(Da Hye Hwang),조재탁(Jae Tak Cho),손권(Son Kown),노상도(Sang Do No),권혁진(Hyeok Jin Kwon),이주연(Ju Yeon Lee),김보현(Bo Hyun Kim) (사)한국CDE학회 2016 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2016 No.동계
Currently, many companies are endeavoring in reflecting various demands on their products. By needs for mass-customization, which means low production volume and high varieties in products, have been increased and this led to increase in cost of production. Design for Assembly (DFA) is a methodology which applies concurrent engineering concept to enable reduction in time & cost for product assembly and improvement in assemblability at product design stage. Most of existing DFA tools are implementing checklist system based on surveys on data gathered from users’ experiences at product design stage, and are assessing design under guidelines and calculating DFA indices and Efficiency. However, such methodology increases workloads, difficulties in application to 3D models and difficulties of users who are not familiar with it in understanding and utilizing. Therefore, 3D model-based DFA system, which is applicable to confirmation of assemblability for reflection onto the product design, is designed and implemented. This 3D CAD-based DFA system is expected to decrease workload and help those users who are not proficient assess assemblability more easily at the stage of product design.
수용액에서 [Pt(dien)X]$^+$ 와 ${NO_2}^-$와의 치환반응에 미치는 온도 및 압력변화
오상오,이상협,여환진,임종완,조두환,Sang Oh Oh,Sang Hyup Lee,Hwan Jin Yeo,Jong Wan Lim,Du Hwan Jo 대한화학회 1989 대한화학회지 Vol.33 No.4
분광광도법을 이용하여 [pt[dien]X]$^+$(X = $Cl^-$, $Br^-$, $I^-$) 와 ${NO_2}^-$와의 치환반응을 $20{\sim}35^{\circ}C,\;1{\sim}1500$ bar 범위에서 조사했다. 이들 반응의 속도는 모두 온도와 압력이 증가함에 따라 증가하였고, 치환 용이성은 $Cl^-$ > $Br^-$ > $I^-$였다. 활성화 부피변화(│${\Delta}V^{\neq}$│)는 모두 큰 음(-)의 값을 가졌고 온도가 증가함에 따라 감소하였다. $25^{\circ}C$에서 구한 일차속도상수($k_1$)와 이차속도상수 ($k_2$)는 압력이 증가함에 따라 다같이 증가하였고, $k_1$ 경로와 $k_2$ 경로에 대한 활성화부피(${\Delta}{V_1}^{\neq}$ 와 ${\Delta}{V_2}^{\neq}$)는 모두 큰 음(-)의 값을 가졌다. 또한 1 bar에서 $k_1$과 $k_2$를 구했고 온도가 증가함에 따라 모두 증가하였다. 각 반응경로에 대한 활성화파라미터를 결정했고, 모든 실험적 결과로부터 이 반응은 이탈기의 성질과 반응경로에 관계없이 회합(A)메카니즘을 가질 것으로 생각된다. Kinetics of the substitution reaction of [pt[dien]X]$^+$(X = $Cl^-$, $Br^-$, $I^-$) with NO2- in aqueous solution were investigated by a spectrophotometric method at $20-35^{\circ}C$ and 1-1500 bars. The rates of these reactions were increased with raising temperature and pressure. The relative reactivities of replaceable ligands in [pt[dien]X]$^+$ follow the order ($Cl^-$ > $Br^-$ > $I^-$). Activation volumes (${\mid}{\Delta}V^{\neq}{\mid}$) were large negative values and decreased with raising temperature. First ($k_1$) and second($k_2$) order rate constants of these reactions were determined at $25^{\circ}C$ and both $k_1$ and $k_2$ were increased with raising pressure and activation volumes (${\Delta}{V_1}^{\neq}$, ${\Delta}{V_2}^{\neq}$) for the $k_1$ and $k_2$ path were large negative values respectively. The $k_1$ and $k_2$ of these reactions were determined at 1 bar and these values were increased with raising temperature. Activation parameters of $k_1$ and $k_2$ path were determined, therefore it can be inferred frp, these results that the substitution reactions of [pt[dien]X]$^+$ with ${NO_2}^-$ proceed through on associative (A) mechanism independent of a leaving groups and reaction paths.