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Son, Young-Wan;Takemura, Kenjiro;Park, Shin-Suk
- Journal of the Korean Society for Precision Engineering
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- v.27 no.4
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- pp.53-62
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- 2010
This study introduces about development of multi-DOF ultrasonic motor that are composed of a bar-shaped stator and a spherical rotor. The ultrasonic motor is a motor which is operated by vibrations over frequency of 20kHz. The multi-DOF ultrasonic motor will be developed by expanding the basic theory of existing 1-DOF ultrasonic motor. It can generate 3-DOF rotation of the rotor around perpendicular axes using 3 vibration modes of stator. By using finite element methods, the optimal dimension of stator is decided and made the components of stator. When we apply the multi-DOF ultrasonic motor composed of rotor and stator to the driving test system, it will be checked whether the motor can be driven at the direction of 3-DOF or not. And it is proposed how the simulation of square bar shaped multi-DOF ultrasonic motor is accomplished.
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;Donald W. White
- Journal of the Computational Structural Engineering Institute of Korea
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- v.16 no.3
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- pp.271-280
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- 2003
The purpose of the study presented in this paper is to develope the general model for capture of the linear and nonlinear response of a flexible diaphragm building in which there are significant contributions from the out-of-plane walls. Two single-story single-diaphragm half scale reinforced masonry buildings were tested by researchers at the United States Army Construction Engineering Research Laboratory (CERL). The first had a metal deck diaphragm. The second specimen had a diaphragm with a single layer of diagonal lumber sheathing, A multiple degree of freedom (MDOF) approach is adopted in this paper. The required stiffnesses and strengths of the components within this model are determined.
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Hur, Hyung-Doh
- International Commerce and Information Review
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- v.15 no.4
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- pp.217-240
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- 2013
The investment environment in Korea and U.S. dramatically changed since Korea-US FTA. The key reasons for this successful change were liberalization and strengthened protection of investment along with trade liberalization which also brought investment market expansion. As the result of trade-diversion effect, investments between two countries have been enormously increased. Through a FTA with the big economy like US, Korea's FTA network has been largely expanded. Korea further needs to utilize this outcome when competing with other countries in investment markets.
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;;Donald W. White
- Journal of the Computational Structural Engineering Institute of Korea
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- v.16 no.4
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- pp.377-386
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- 2003
The proposed simplified MDOF model is applied to a half-scale single-story reinforced masonry test building with a single diagonally-sheathed diaphragm. Comparisons of analytical studies to experimental tests can be valuable for understanding the seismic response of these types of buildings and for determining the qualities and limitations of the simplified models. A model calibration process is performed in this paper to determine the required structural properties based on the elastic and inelastic test responses for test building. This approach is necessary since established methods to determine the in-plane and out-of-plane stiffness, strength, and hysteresis do not exist.
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Lee, Hyo Won
- International Area Studies Review
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- v.22 no.1
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- pp.3-21
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- 2018
The WTO was established in 1995 as an organization which protects and promotes free trade among its members. However, since about this time they have signed many bilateral and multilateral FTAs and joined many other new international agreements and organizations, the purpose of which at times overlaps with that of the WTO. Some existing works on international organizations contend that these FTAs and many other IOs could weaken the role of the WTO as a promoter of free trade. However, the results of regression analyses on the use of the WTO do not support this argument, but show that the experiences of WTO members in these FTAs and many other IOs help them to use its dispute settlement mechanism more frequently