• Journal of KSNVE
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• v.6 no.2
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• pp.233-244
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• 1996

In this paper chaotic mothions of a straight pipe conveying oscillatory flow and being subjected to external forces such as earthquake are theoretically investigated. The nonlinear partial differential equation of motion is derived by Newton's method. In this equation, the nonlinear curvature of the pipe and the thermal expansion effects are contained. The nonlinear ordinary differential equation transformed from that partial differential equation is a type of Hill's equations, which have the parametric and external exciation term. This original system is transfered to the averaged system by the averaging theory. Bifurcation curves of chaotic motion of the piping system are obtained in the general case of the frequency ratio, n by applying Melnikov's method. Numerical simulations are performed to demonstrate theorectical results and show strange attactors of the chaotic motion.

• The Journal of the Acoustical Society of Korea
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• v.16 no.5
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• pp.36-42
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• 1997

This paper purposes the measurement method of vibration intensity in building structure which is a method of measuring the intensity and the flow of vibration energy. We derived basic theory and measuring theory for a simple beam, and comparison of the experimental results with calculated results. As a result, according to the calculated value from acceleration distribution and the measurement result from the method of vibration intensity under the condition except near field of measurement zone. The measured results, show that this method is useful for measuring the vibration energy flow in building structure.

• Journal of Digital Convergence
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• v.16 no.1
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• pp.293-303
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• 2018

This paper aimed to research the brand personality, brand equity, and brand value of Taobao and Jindong (JD) as well as the difference between the two brands. Chinese consumers receive the questionnaire survey in groups. A total of 321 questionnaires were distributed, of which, 162 for Taobao and 159 for JD. The findings, first, determine the brand personalities of Taobao(sincerity, sophistication, competence and excitement) and JD(competence, sophistication, and excitement). Second, find the influential relationship between brand personality and brand equity. For Taobao, the sincerity of personality has a positive impact on brand loyalty, image and perceived quality. The competence impact on brand loyalty, awareness, and image. The sophistication impact on brand image and perceived quality. Competence and sophistication of the JD personality impact on the brand equity. Excitement of JD impact on the perceived quality. Third, the brand loyalty and perceived quality of Taobao have a positive influence on the brand value; and brand loyalty, image, and perceived quality of JD have a positive influence on the brand value. In the future research, the findings of the research provide a theory basis for the brand management, and can take more consideration into the relations among other variables in the context of online shopping environment.