• Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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• 1999.06a
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• pp.203-208
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• 1999

Friction and wear test have been performed on nylon, polyacetal, and PTFE(polytetrafluoroethylene), in reciprocating dry sliding conditions against a steel disc. According to the results, polyacetal show lowest wear rates and PTFE was found to exhibit lowest friction coefficient. The prominent wear mechanism found were adhesion and abrasion.

• Journal of the Korean Institute of Telematics and Electronics A
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• v.29A no.2
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• pp.8-17
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• 1992

In this paper a push-push oscillator using DR (dielectric resonator) at K-band is designed and constructed. Two identical oscillators are arranged in a push-push configuration that has the frequency of oscillator that is twice frequency each oscillator. A dielectric resonator is placed at the input of an active two-port device(FET) yielding a stable frequency source. The oscillators realized with this technique exhibit excellent spectral purity and cancellation of fundamental frequency.

• 제어로봇시스템학회:학술대회논문집
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• 1992.10b
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• pp.618-623
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• 1992

In this paper robotic manipulators in which the joints exhibit a certain amount of elasticity are considered. Based on a feedback linearized model, sliding mode control system is designed. In the control system design, weak joint stiffness assumption does not needed. Simulation results are presented to verify the validity of the control scheme. A robustness analysis for a feedback linearized model is also given with respect to uncertainties on the robot parameters.

• Journal of the Korean Institute of Telematics and Electronics S
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• v.34S no.9
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• pp.60-66
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• 1997

WE consider the stabilization of a class of multivariable nonlinear system using variable structure output feedback control. A high-gain observer is used to estimate state variable while rejecting the effect of the disturbances. We design a globally bounded output feedback variable structure controller that semi-globally stabilize the closed-loop system, while state variables do not exhibit a peaking.

• Bulletin of the Korean Chemical Society
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• v.23 no.4
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• pp.593-597
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• 2002

(R,S)- and (R)-2-Benzylcysteine (1) and (R,S)-2-phenethylcysteine (2) were synthesized and evaluated as inhibitors for carboxypeptidase A (CPA) with the expectation that these compounds exhibit improved inhibitory activities over 2-benzyl-3-mercaptopropanoic acid (BMPA), a potent CPA competitive inhibitor, possibly having additional interactions of their amino group with the carboxylate of Glu-270 of the enzyme upon binding to CPA. Contrary to the expectation, however, the CPA inhibitory potencies of these compounds were found to be much reduced compared with that of BMPA, suggesting that the amino group in the inhibitors rather exerts steric hindrance in binding of these inhibitors to CPA.

• Proceedings of the KIEE Conference
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• 2007.10a
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• pp.131-132
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• 2007

This paper presents a numerical solution of PID controller design. The complete set of PID controllers stabilizing an LTI plant that solely determined from the knowledge of the frequency response and the number of unstable poles of the plant. An illustrative example is given to describe implementation of the design algorithm and exhibit graphical displays of the feasible regions of the design parameters.

• Proceedings of the KIEE Conference
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• 2007.10a
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• pp.57-58
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• 2007

This paper presents a numerical solution of first order controller design. The complete set of first order controllers that stabilizes for a LTI plant solely determined from the knowledge of the frequency response and the number of unstable poles of the plant. An illustrative example is given to describe the design procedure and exhibit graphical displays of the feasible regions of the design parameters.

• Proceedings of the Korea Concrete Institute Conference
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• 2006.11a
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• pp.257-260
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• 2006

Coupled shear walls consist of two or more in-plane walls inter-connected with coupling beams. In order to effectively resist seismic loads, coupling beams must be sufficiently stiff, strong and posses a stable load-deflection hysteretic response. Much of requirements to the civil and building structures have recently been changed in accordance with the social and economic progress. Ductility of high performance fiber reinforced cementitious composites(HPFRCCs), which exhibit strain hardening and multiple crackling characteristics under the uniaxial tensile stress is drastically improved. This paper provides background for design guidelines that include a design model to calculate the shear strength of pseudo strain hardening cementitious composite steel coupling beam.

• Proceedings of the Korean Powder Metallurgy Institute Conference
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• 2006.09a
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• pp.256-257
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• 2006

3D printing of NiTi alloys has been successfully achieved. A novel printing process has been developed and used, which consists in selective deposition of a solvent on a granule bed. The granules are composed of metal powders and thermoplastic binder, which are mixed and sieved by conventional methods. A sound green strength is obtained after solvent evaporation. Sintered parts exhibit good density, proper phase composition and shape memory behaviour.

• Korean Institute of Interior Design Journal
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• no.5
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• pp.9-16
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• 1995

The purposed of this study is searching the characteris-tic of 'Movement' expression by the Moving experience in display space. First, the concept of 'Movement' was defined by visitor's moving experiences according to the time pass and to visual perception. Exhibit cases were analygied to fine the relationships the defined 'Movement' experience with display spaces. But, 'Movement' is related moving experience from the entrance to importance of display space, and that is picked out key word in movement expression. Consequently, two category (visual expression, expres-sion method) to regard on the space design in display space was suggested focused on the concept of 'Movement'.