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Chloroform 용매 중에서 Aniline과 Iodine간의 Charge Transfer Complex 형성 Mechanism에 대한 연구
권오윤,崔相元,金南政 여수대학교 1989 論文集 Vol.3 No.-
The formation of charge transfer complex between indine and aniline in chloroform solvent have been studied kinetically by using conductivity method. The initially formed outer charge transfer complex was transformed into a inner charge transfer complex. The pseudo first order rate constants and aitivation entropy are affected by aniline concentration. The second order rate constants for the decomposition of the outer charge transfer complex(first order in aniline and in the outer charge transfer complex) depend on the aniline concentration. The ease with which the transformation proceeds depends on the relative magnitudes of the enthalpy of formation of the outer charge transfer complex as well as dielectric properties of aniline.
최상원,권오윤,김남정 여수대학교 1990 論文集 Vol.4 No.-
Viscoelastic properties of nonlinear polymeric materials on stress relaxation were investigated in the solvents of H₂O, air and electrolytes using an Instron(UTM-4-100 Tensilon) with solvent chamber. The theoretical stress relaxation equation derived by appling the Ree-Eyring's hyperbolic sine law to dashpot of three element non-Newtonian model was applied to the experimental stress relaxation curves, and the model parameters G₁,G₂,α and βwere obtained. The rheological properties and the mechanical properties of nonlinear viscoelastic solid polymers are studied from these model parameters.
해수의 농도 변화에 따른 bentonite 침전에 대한 유변학적 고찰
최상원,서호준,권오윤,김남정,방정환 한국환경과학회 1996 한국환경과학회지 Vol.5 No.1
For studying of coagulation and sedimentation in estuarine clay, we obtained several flow curves with various concentrations of sea water by using Coutte type rotational rheometer. The initial shear stress on high concentration of sea water was observed big, but after this, its value is decreasing with increasing shear rate. The maximum pick of shear stress is decreasing with the decreasing of concentration of sea water. The trend is same totally above for viscosity. The sedimentation times with the concentration of sea water vary in ∞ ∼ 5 minutes. The zeta potential is changed dramatically between 1/4 and 1/8 concentration of sea water. That is consistent with the sedimentation graph. From these results, the phenomena of coagulation and sedimentation can be explained with viscoelastic terms on structual formation among particles by the changes of surface potential affected from contacting sea water to dispersed particles.
이경순,이영빈,최익준,송하영,박주은,구현주,김부성,김영옥,하수종,김양지,권남정,이세인,Lee, Kyung-Soon,Lee, Young-Bin,Choi, Ick-Jun,Song, Ha-Young,Park, Ju-Eun,Koo, Hyun-Ju,Kim, Bu-Sung,Kim, Young-Ok,Ha, Su-Jong,Kim, Yang-Ji,Kwon, Nam-Jung 대한물리치료과학회 2012 대한물리치료과학회지 Vol.19 No.3
Background : The purpose of this study is to understand the effects of ankle joint taping on balancing abilities of the elderly and to provide preliminary data on preventing falls among the elderly. Methods : In this study, 20 students(8 male, 12 female) in their 20s from D University as well as 14 elderly(4 male, 10 female) in their 70s from S community center have participated. The participants were well informed about the experiment and voluntarily participated. We measured the difference in balancing ability before and after taping between the two groups using methods such as standing on single-leg stance, TUG, and plantar pressure. Kinesio taping, a stop-watch, and the EMED-system were used as equipment along with the SPSS 12.0 program, with a significance level of 0.05, to test the difference before and after taping between the two groups. Result : First, the 70s group showed a significant increase in the dorsal flexion angle after taping. Second, the 70s group showed a significant increase in duration time of standing on one foot after taping. Third, the 70s group's TUG time was significantly shorter. Fourth, the maximum peak value for static and dynamic plantar pressure showed a significant decrease after taping; and dynamic plantar pressure area value decreased as well within significant range. Conclusion : The study has shown that taping is effective on static dynamic balancing ability of the elderly.