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손동우,권영민,반사평,김순중 世明대학교 한의학연구소 2003 韓醫學硏究所 論文集 Vol.5 No.-
The purpose of this study was to investigate the effects of Aromatic Essential Oil and Hong-Hwa Oil Massage on recovery from muscle fatigue. The subjects were twenty four male college students and treated Aromatic Essential Oil massage therapy, Nomral massage therapy, Hong-hwa oil Massage therapy and Non-treated group. After 15, 30 minutes, to observe changes related to physical changes during exercises from muscle fatique of recovery period, it was measured by Electromyogram during thirty minutes of recover period. Two-way repeated ANOVA was performed at the significance level of 0.05 to analyze the data. The results were as following; 1. Considering the changes of reaction time in knee joint extension after exercise, Periods of all groups showed decrease nearly the same. So each period didn't show significant decrease in comparing with other all gorups. 2. Considering the changes of EMG reaction time in knee joint extension after exercise, Each periods and all groups didn't show significant decrease. But Aromatic Essential Oil therapy group showed remarkably decrease in comparing with other group. 3. Considering the changes of peak amplitude during initial phase 100 msec in knee joint extension before and after exercise, Each periods of all groups didn't show significant decrease. Aromatic Essential Oil therapy and Hong-hwa oil massage group had show remarkably decrease in comparing with other group but it is not significant. 4. Considering the changes of mean amplitude during total phase in knee joint extension before and after exercise, Each periods of all groups showed significance decrease. And Aromatic Essential Oil massage group showed remarkably significant decrease in comparing with other groups. According to the above results, it tis considered that Aromatic Essential Oil massage can be a way to help to recover from muscle fatique.
홍동표,홍용,왕고평,김병진,김영문,이재정,김재열 한국공작기계학회 2006 한국공작기계학회 추계학술대회논문집 Vol.2006 No.-
This paper presents a primary study for a new method of enhancing measurement using impedance analysis method, which is widely used for structure health monitoring. Many of skyscrapers, bridges, tunnels, which have been built up several years, and nearly reached their operating life due to aging crack, material deterioration, and so on. therefore, the health monitoring technique has obtained considerable attention. The goal of this research is to show basic information to evaluate structural health condition using piezoelectric sensors. The piezoelectric materials have various merits. It is easy to shape various forms and can be embedded on the materials more conveniently. Moreover, the excitation frequency can be changed and the piezoelectric sensors cost less. All these features make the piezoelectric-based system applicable to structural healthy monitoring. This work presents a study for the development of a practical and quantitative technique for assessment of the structural health condition by piezoelectric impedance-based technique associated with longitudinal wave propagation. To estimate the damage condition numerically, we suggest the evaluation method Cov (Covariance) and CC (Correlation Coefficient) in this paper.
Modified embedded-atom interatomic potential for Co-W and Al-W systems
DONG, Wei-ping,CHEN, Zheng,LEE, Byeong-Joo Elsevier 2015 Transactions of Nonferrous Metals Society of China Vol.25 No.3
<P>A semi-empirical interatomic potential formalism, the second-nearest-neighbor modified embedded-atom method (2NN MEAM), has been applied to obtaining interatomic potentials for the Co-W and Al-W binary system using previously developed MEAM potentials of Co, Al and W. The potential parameters were determined by fitting the experimental data on the enthalpy of formation, lattice parameter, melting point and elastic constants. The present potentials generally reproduce the fundamental physical properties of the Co-W and Al-W systems accurately. The lattice parameters, the enthalpy of formation, the thermal stability and the elastic constants match well with experiment and the first-principles results. The enthalpy of mixing and the enthalpy of formation and mixing of liquid are in good agreement with CALPHAD calculations. The potentials can be easily combined with already-developed MEAM potentials for binary cobalt systems and can be used to describe Co-Al-W-based multicomponent alloys, especially for interfacial properties.</P>
Dong-xia Zhao,Dong-xia Fan,Ya-ping Guo 제어·로봇·시스템학회 2022 International Journal of Control, Automation, and Vol.20 No.8
In this paper, the well-posedness and stability of a 1-d 2×2 hyperbolic system under proportional feedback control is addressed. The semigroup approach and norm equivalence theorem is adopted to obtain the explicit dissipative condition for control parameters. The asymptotic spectral analysis of the system is presented. It is shown that the real part of the eigenvalues goes to some negative constant as the modulus of eigenvalues goes to +∞. Moreover, we find that there is a group of generalized eigenfunctions which forms a Riesz basis of the Hilbert state space. Hence, the spectrum determined growth condition holds, and then the exponential stability is established.
Ping Fan,Zhuang-Hao Zheng,Jing-Ting Luo,Guang-Xing Liang,Dong-Ping Zhang 대한금속·재료학회 2015 ELECTRONIC MATERIALS LETTERS Vol.11 No.3
In this study, AZO thin films prepared by direct current reactive magnetron sputtering using a Zn-Al alloy target and In with varied content were doped through the prefabricated layer doping method in order to optimize their thermoelectric properties. The effects of In content on the room temperature microstructure and thermoelectric properties of the AZO thin films were investigated. It was found that the absolute value of the Seebeck coefficient of the thin films increases stably after In doping and reaches 153 μV·K−1 when the In content is 0.71%. Though the electrical conductivity of In-doped thin films is smaller than those of the un-doped films, the power factor of the thin films shows a significant increase after In doping with a maximum value of 2.22 × 10−4 W·m−1·K−2, which is several times that of the un-doped films.