• International Journal of Computer Science & Network Security
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• 제21권12호
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• pp.323-327
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• 2021

The article examines the process of professional training in educational institutions, media technologies and methods of media communication in the educational space of the institution, characterizes the place of media technologies in the educational space in the context of the term "educational space" itself, systematizes the methods of media communications in education. The peculiarities of media education as a set of means and methods of teaching young people adequate media perception are pointed out.

• International Journal of Computer Science & Network Security
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• 제22권1호
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• pp.218-224
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• 2022

The article describes the concept of a Web-portal of an educational institution; the technical conditions for the creation of the Web-portal of the educational institution were determined; the features of the use of the Web-portal in the educational process and its organization are revealed. The scientific and practical value of the article lies in the fact that the use of portals in education will improve the management of an educational institution, activate and bring the educational process to the level of modern technologies at all its stages, as well as enhance the interaction of parents and students with employees of the educational institution.

• Tribology and Lubricants
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• 제16권4호
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• pp.289-294
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• 2000

This paper present the contact stresses, which considers the shear stress at the cam and follower interface in the direct acting type valve train system of a high speed engine. To determine the contact condition, the normal contact forces are calculated by using the lumped mass dynamic modeling. The line contact is considered between the cam and follower interface. The variations of dynamic stresses are presented as a function of camshaft rotational angle. Also the effects of various design parameters are investigated.

• The Journal of the Acoustical Society of Korea
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• 제17권2E호
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• pp.47-52
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• 1998

An analysis of dynamic responses is carried out on monoclinic anisotropic system due to a buried harmonic line source. The load is in the form of a normal stress acting along an arbitrary axis on the plane of symmetry within the orthotropic materials: In case that the line load is acting along the symmetry axis normal to the plane of symmetry, plane wave equation is coupled with verital shear wave and longitudinal wave. However, if the line load is acting along an arbitrary axis normal to the plane of symmetry, plane wave equation is coupled with vertical shear wave, longitudinal wave and horizontal shear wave. We first considered the equation of motion in a reference coordinate system, where the line load is coincident with a symmetry axis of the orthotropic material. Then the equation of motion is transformed into one with respect to general coordinate system with azimuthal angle by using transformation tensor. Plane wave solutions of monoclinic systems are derived for infinite media. Finally complete solutions for the plane harmonic wave are obtained by calculating the inverse of the integral transforms, in which bulk wave poles are avoided by deforming the contour of the integration to the complex plane. Numerical results for examples of orthotropic material belonging to monoclinic symmetry are demonstrated.

• 한국자동차공학회논문집
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• 제5권5호
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• pp.27-36
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• 1997

For the strength design of the brake system of a forklift truck, a procedure to calculate the internal forces acting on the system is presented in this paper. Vehicle dynamics, brake system kinematics, and internal force equilibrium analysis are integrated into the procedure. Design parameters such as stopping distance, maximum decceleration, and maximum torque generated by pedal force are considered in the vehicle dynamics, and geometric parameters of the brake system are considered in the brake system kinematics. With the two analysis results obtained, the internal forces acting in the brake system are finally calculated in the procedure.

• 대한토목학회논문집
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• 제28권5C호
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• pp.303-311
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• 2008

양방향 고유압 복동식 재하장치는 저유압 단동식 양방향 말뚝재하시험의 단점을 극복할 수 있을 뿐만 아니라 경제성을 확보할 수 있고 재하용량의 한계도 극복할 수 있는 장점이 있으며, 또한 사용말뚝의 품질안정성을 확보할 수 있다. 본 연구에서는 양방향 고유압 말뚝재하시험의 시험 시 안전성, 신뢰성 및 적용성을 확보하기 위하여 양방향 고유압 재하장치에 사용되는 고유압잭의 검 교정실험, 고유압호스의 길이에 대한 보정실험 및 동조식고압배관시스템의 보정실험을 실시하였으며 실험결과의 신뢰도($R^2$)는 1.0에 근접하고 있으므로 신뢰도는 매우 높은 것으로 판단되었다.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2007년도 추계학술대회논문집
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• pp.722-726
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• 2007

In this paper we deal with a design of the integral sliding mode controller to suppress the disturbance force acting on the suspension system of the magnetically levitated train system. One of the important factors that cause the disturbance force acting on the suspension system comes from the low propulsion speed of linear induction motor. In this paper integral sliding mode controller is employed to reject the disturbance force produced by the propulsion system of the linear induction motor. In order to show the effectiveness of the designed controller a dynamic simulation is utilized and the sliding mode controller without integral compensator is compared with the proposed integral sliding mode controller to suppress the disturbance force.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2006년도 춘계학술대회 논문집
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• pp.51-52
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• 2006

Gabion can be used for the purpose of preventing overflow of river and side loss of road. However the manufacturing process of the gabion is manually controlled especially to the joining process at the terminal part of gabion with small diameter wire. In this paper automatic feeding guide system was designed and fabricated to make automation. The fabricated system was tested in the factory level. Pneumatic system was considered as the main idea of the feeding system. 3/2-way and 5/2-way manual control valve, eight double-acting cylinders were used. Based on the theoretical simulation and actual test the fabricated system was well controlled. The system was applied to the patent.

• 한국자동차공학회논문집
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• 제6권3호
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• pp.78-87
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• 1998

A dynamic model of direct-acting OHC valve train system has been used to determine the load conditions in the system. The modified equations for calculating the friction forces between cam and HLA, and at a camshaft bearing have been defined considering the lubrication conditions. Then, to understand the frictional characteristics in the system, a parameter study has been performed. As the results of the analysis, valve spring stiffness and preload have great effects on the friction in the system, but the effects of other parameters are negligible. So, how to design the valve train system with respect to the reduction of friction is to minimize the valve spring stiffness and preload in the limit of satisfying the dynamic constraints.

• Journal of Microbiology
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• 제38권2호
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• pp.113-116
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• 2000

Escherichia coli F plasmid partition apparatus is composed of two trans-acting proteins (SopA and SopB) and one cis-acting DNA sequence (sopC). The SopB-sopC complex has been suggested to serve a centromere-like function through its interaction with chromosomally encoded proteins which remain to be identified. In this paper, we are introducing a new yeast 1.5-hybrid system which assembles the two-hybrid and one-hybrid system as a mean to find and additional component of the F plasmid partition system, interacting with DNA (sopC)-bound SopB protein. The results indicates that this system is a promising one, capable of selecting an interacting component.