• 전자공학회논문지 IE
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• v.44 no.4
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• pp.30-34
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• 2007

The Channel environment is poor in the power line communication because power line proposed power supply use a communication medium. In this paper, we designed gate drive circuit used coupler reducing the signal diminution for the good communication. We analyzed receiving and transmitting operation of the coupler and designed the drive circuit with the suitable impedance. As a result, we improved the environment of impedance variation due to the inter reaction of many electron products. So, to improve BER(45%) enabled us to communicate smoothly in power line communication.

• 한국HCI학회:학술대회논문집
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• 2008.02b
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• pp.53-59
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• 2008

본 연구에서는 온라인 환경과 모바일 환경이 가지는 각 플랫폼의 약점은 서로 보완하고 각각이 가진 강점을 최대한 활용할 수 있는 방법으로 유무선 연동을 이용한 게임을 제안한다. 이를 위해 유무선 연동방식익 게임 구성방법과 이러한 게임구성에 있어 게임 플레이어가 몰입할 수 있는 요인들에 대해 고찰하였다. 본 연구는 게임의 구성요소를 코어메카닉(Core Mechanic)과 코어 메카닉의 변화(Core Mechanic Variation), 캐릭터(Character)로 구분하고 이러한 구성요소들을 물리적, 사회적 시뮬레이션(Simulation)이라는 방법으로 구성하여 이를 실제 유무선 연동방식 구현 사례 게임 <똘끼>를 통해 설명한다. 또한, 게임을 디자인하는데 있어 게임 플레이어가 몰입할 수 있는 3가지 변인으로서 통제감, 숙련도와 도전감, 사회적 상호작용을 제안하고, 이들 변인들을 게임 플레이어에게 제공하는 방법들을 적용 사례 <똘끼>를 통해 설명한다. 본 연구는 하나의 플랫폼에서만 플레이할 수 있었던 기존의 게임과는 차별화되는 유무선 연동을 이용한 게임을 통해 게임의 구성방법과 게임플레이어에게 게임에 대한 몰입감을 제공하는 방법에 대하여 연구함으로써 게임디자인에 있어서 새로운 구성방향을 제시했다는 점에서 의의를 가진다.

• Water for future
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• v.14 no.2
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• pp.53-62
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• 1981

In the Hydraulic Structure, Such as dam body or levee of river that is constructed with soil, We analyzed a top line of free ground water table. This study is based on the logical reason that the pressure on the free surface is atmospheric and the seepage line is a stream line. In order to research for the unknown seepage line. We analyzed seepage water of steady flow through parous media by Finite Element method based on Galerkin Principle, and compared the comluted value with experimental value. The results show that the computed value was nearly equal to the experimental value. Finally, it noticed that finite Element method was more practical than Experimental Method for Seepage line analysis.

• Journal of the Korean Society of Manufacturing Technology Engineers
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• v.8 no.5
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• pp.96-101
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• 1999

This study suggests an algorithm for tooth profile generation of free from curve involute gear, a special gear of which the pitch line is a free curve instead of a circular one. For the first, a methodology for calculation of the tooth curve is developed and formulated Then the formulated algorithm, is programmed for manufacturing and verified by computer graphics. Next the calculated results as changed in to NC codes to apply to wire electric discharge machine(WEDM). Finally, the machined gear is examined in engagement with a standard involute gear.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2013.06a
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• pp.127-129
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• 2013

문풀은 해저케이블선, 해저탐사선, 생산용 부선, 드릴쉽과 같은 여러 종류의 선박에 설비되어 해상에서 각 작업에 필요한 장비의 진수 및 작업공간으로 활용되고 있다. 이러한 문풀내 자유수면의 유동은 정수중 부유체의 이동으로 인한 것과 작업중인 부유체에 작용하는 입사파에 의해 기인하는 것으로 알려져 있다. 본 연구에서는 입사파에 의한 문풀내 유동 특성을 분석하기 위하여 다양한 해상상태, 즉 서로 다른 파고와 파장에서의 자유수면의 변화와 문풀에 작용하는 유체력 계산을 CFD에 의하여 수행하였다. 수치 계산 결과 문풀내 수면 상승 및 유체력은 파고 및 파장에 의해 크게 영향을 받고 이것은 보오텍스와 같은 비선형 현상에 의한 것임을 확인할 수 있었다.

• Analytical Science and Technology
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• v.11 no.6
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• pp.413-420
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• 1998

The hydrophobic interaction has been studied on sodium naphthalene derivatives such as sodium 1-naphthaleneacetate (S1NA), sodium 1-naphthalenemalonate (SINM), sodium 2-naphthaleneacetate (S2NA), and sodium 2-naphthalenepropionate (S2NP) in $H_2O$-MeOH mixture solutions and in surfactant solutions. In $H_2O$-MeOH mixture solutions, the hydrophobic interaction was measured, and resulted in the red shift in emission spectra. In cationic surfactant, cetyltrimethylamonium bromide (CTAB) solution, the hydrophobic interaction was also observed by the red shift in absorption and emission spectra.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.14 no.4
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• pp.423-434
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• 2001

In this paper, a three-span continuous box girder is analysed by using elastic equation based on energy method, concerning the behaviour with the effects of bending and pure torsional moment. The statically indeterminate forces of a three-span continuous curved box girder are calculated by applying the principle of least work to this elastic equation. The influence line of shear force, bending moment, pure torsion, displacement and angle of rotation due to unit vortical load and unit torque for curved box girder are obtained. The internal forces of the curved box girder which the actual load is applied can be calculated using the influence line obtained from this study.

• Journal of Korean Society of Steel Construction
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• v.12 no.3 s.46
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• pp.269-279
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• 2000

It is much expected that steel bridges, which have been damaged by increase of vehicle load and corrosion, need repair or strengthening. In this paper, the stress generated by repair welding under loading are analyzed by three dimensional elasto-plastic analyses. The longer and deeper repair weld line bocemes, the larger the magnitude of transient stress becomes. The magnitude of transient stress generated by repair welding under loading $({\sigma}_y/3,\;{\sigma}_a)$ is similar to summation of stresses generated by repair welding and loading. The longer repair weld line ratio(1/b) becomes, the larger the magnitude of transient stress generated by repair welding under loading bocomes. And, the longer repair weld line ratio(1/b) becomes, the larger the magnitude of in-plane displacement generated by repair welding under loading$({\sigma}_y/3,\;{\sigma}_a)$.

• 한국생물공학회:학술대회논문집
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• 2003.10a
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• pp.674-675
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• 2003

• Proceedings of the Korean Nuclear Society Conference
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• 2001.05a
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• pp.437.2-437
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• 2001