• Geophysics and Geophysical Exploration
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• v.12 no.4
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• pp.355-360
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• 2009

This paper presents mobile robot based down-scale mineral resources exploration test system for the USN (Ubiquitous Sensor Network) based exploration. The system emulates the actual exploration environment. Underneath the metal free test plate, a metal object is attached. A magneto-meter mounted mobile robot runs around on the plate to find the metal. The measured magneto-meter values are transferred to the host PC via wireless network. The system enables to improve the reliability of simulation as well as to help efficient exploration system design. Metal-detecting experiments were carried out to illustrate the efficiency of the proposed system.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 1999.11a
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• pp.153-156
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• 1999

In this paper, a plate type ozonizer has been designed and manufactured to minimize the size of ozonizer. This ozonizer have following benefits : \circled1 convenience of shift and installation \circled2 maximize space utility. Therefore, ozone generation characteristics have been investigated by varying flow rate, supplied voltage and gap spacing of plate electrodes.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.17 no.4
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• pp.74-80
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• 2003

Ionic wind is produced by a corona discharge when a DC high voltage is applied across the point-to-plane gap geometry. The corona discharge phenomena have been investigated in several beneficial application fields such as electrostatic cooling, ozone generation, electrostatic precipitation and electrostatic spraying. Recently ionic wind might be used in aerodynamic, for example, heat transfer, airflow modification, and etc. In this work, in order to analyze the control behavior of the velocity and amount of ionic wind produced by the positive DC corona discharges. The ionic wind velocity was measured as a function of the applied voltage, diameter of the punched hole on plate electrode and separation between the point-to-plate electrodes. As a results, the airflow is generated from the tip of needle to the plate electrode in the needle-to-punched-plate electrode systems. The ionic wind velocity is linearly increased with an increase in applied voltage and ranges from 1 to 3 m/sec at the locations of 100-200 mm from the punched-plate.

• Proceedings of the Technology Innovation Conference
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• 2009.02a
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• pp.605-626
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• 2009

본 연구는 IT산업에서 일반적으로 제품 수명이 짧은 반면, 특허출원부터 등록시 까지 기간이 많이 소요되기 때문에 과연 특허출원하는 것이 실효성이 있을 지에 대한 의구심에서 출발하여 IT산업에서 특허 보유의 필요성이 있는지 여부에 대해 여러 각도에서 집중 분석해 보았다. 본 연구에서는 IT산업에 대한 정의, 국내 IT산업의 세계 시장에서의 위치 및 특허 환경 분석을 통한 분석과 IT산업에서 실제 사용되었던 특허를 사례별로 분석해 봄으로써 전략적으로 특허를 창출하는 방안을 제시하고자 했다. 본 연구결과 우리나라 IT산업의 세계시장에서의 점유율이 높은 부분인 낸드플래시메모리, 평판패널, DRAM, 이동통신 단말 부분에 대한 국내 특허출원 건수를 조사한 바, DRAM, 낸드플래시메모리, 평판패널 그리고 이동통신 단말 순으로 특허출원 건수가 많음을 알 수 있었다. 또한 IT산업의 국내 특허분쟁 사례를 조사한 바, 총산업 대비 41%를 점하고 있다는 사실을 알 수 있었다. 이러한 특허 환경에 대처하기 위해서는 전략적으로 특허를 확보해야 하는 당위성에 입각하여 실제 기업에서 특허분쟁에서 사용되었던 강한특허를 벤치마킹하여 어떻게 특허를 창출해야할 지에 대한 답을 얻고자 했다. 그 결과로 연구개발을 통한 많은 실시 예 확보, 명세서 작성 시 한정적인 용어의 선택을 피하고, 발명의 내용을 확대할 수 있는 특허제도 활용, 마지막으로 의견서 제출 시 균등해석을 제한하는 표현 삼가 등이 전략적으로 특허를 창출하는 핵심 요소로 분석되었다.

• Journal of IKEEE
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• v.16 no.3
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• pp.173-176
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• 2012

This paper introduces a novel horn antenna for circular polarization using a planar-type radiator. This antenna can be divided to two parts, microstrip antenna and square horn. The microstrip antenna has the role of feeder and polarizer of the horn antenna, and it is designed to stacked type having metal spacer for high gain, high isolation and wideband characteristic. Using the proposed antenna structure, the horn antenna needs not additional structure such as feeder and polarizer, and the size of it can be considerably reduced. The horn antenna has typical gain of 8dBi and 3-dB axial-ratio bandwidth around 4.9%.This antenna can widely used for various antenna system for mobile and satellite communication using circular polarization expecially in high frequency band.

• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.722_723
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• 2009

본 논문은 FEM(Finite elements Method)을 활용하여 가로축길이/외경지름 비가 약 2 정도로, 넓적한 평판형 전동기 해석을 할 때 고려해야 할 사항이다. 즉, 오차 발생 요인중의 하나인 축방향 누설을 고려한 해석 방법으로, 이를 위해 2차원해석과 3차원해석을 비교함은 기본이고, 일반적으로 사용하는 방법보다 효율적인 방법을 제안한다. 그후 일반화의 가능 여부와 다른 방안들을 고려하여 본다.

• Proceedings of the KIPE Conference
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• 2015.07a
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• pp.455-456
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• 2015

본 논문에서는 무선전력 전송을 위한 평판 나선형 코일의 최적 형상 선정을 위해 각 코일의 형태에 따른 출력 성능을 비교 및 평가한다. 코일 간 결합계수, 각 코일의 Q-factor 측면에서 송수신 패드의 성능을 비교하며, 이를 위해 송수신 패드가 차지하는 면적을 최대한 활용하여 모델링 한다. 모델링한 코일에 대하여 수신패드의 수직 및 수평이동에 대한 성능 지표를 평가하고 코일의 최적 형상을 선정한다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.13 no.12
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• pp.5655-5660
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• 2012

The objective of this study is theoretically to suggest the effective heat exchanger design method using boundary layer analysis. The boundary layer formation and interruption on rectangular plate and round plate fins are explained and the heat transfer coefficients showed with the variation of the velocity and temperature boundary layer. In addition, the flow pattern on one plate fin surface considered as external flow and flow pattern between fins considered as internal flow. As a result, theoretical method for the boundary layer interruption avoidance is suggested and the heat transfer coefficient of the round plate fin was higher than that of the rectangular plate fin because of the less thermal and velocity boundary layer thickness except the centerline.

• The Journal of the Acoustical Society of Korea
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• v.23 no.5
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• pp.340-352
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• 2004

Acoustic streaming induced by the microscopic longitudinal ultrasonic vibration at 28.5 ㎑ is visualized between the quiescent glass plate and ultrasonic vibrator by particle imaging velocimetry(PIV) using laser. To investigate the augmentation of air flow velocity of acoustic streaming. the velocity variations of air streaming between the stationary plate and ultrasonic vibrator are measured in real-time. It is experimentally investigated that the magnitude of the acoustic streaming dependent upon the gap between the ultrasonic vibrator and stationary p1ate results in the variations of the average velocity fields as a outcome of the bulk air flow caused by the ultrasonic vibration. In addition. maximum acoustic streaming velocity exists at resonant gap. 18mm that is one of the resonant gaps (H=18, 24, 30, 36㎜) at which resonance occurs. The variation of the local maximum turbulent intensity with axial direction appear to reveal the value of 8%∼70% dependent upon the gap between the quiescent glass plate and ultrasonic vibrator. Shearstress is also maximized at the center region of the vibrator and the vorticity is also maximum and minimum in the neighborhood of the center of the vibrator at which the local maximum turbulent intensity and shear stress exist.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.13 no.1
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• pp.73-79
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• 2001

In this study, a submerged plate-type breakwater is considered, which is supported by elastic foundation. This breakwater makes use of wave phase interaction among the incident, diffracted and radiated waves. We apply a three-dimensional singularity distribution method within the linear potential theory in order to describe the wave field. The submerged plate is assumed to be rigid and the elastic support be a linear spring with constant stiffness. A typical rectangle plate is exemplified for numerical calculation. The thickness of the plate is carefully selected in order to guarantee the solution to be stable by checking the condition number of the system matrix. A parametric study is carried out for examining the effect of the stiffness of the elastic support on performance of the breakwater. We also examine the effect of the submerged depth.