• Title/Summary/Keyword: 김정재

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Position Control of Micro Particles in a Fluid Flow Using Ultrasonic Standing Wave (정재초음파를 이용한 유동중 미세 입자 위치 제어)

  • Cho, Seung-Hyun;Seo, Dae-Cheol;Ahn, Bong-Young;Kim, Ki-Bok;Kim, Yong-Il
    • Journal of the Korean Society for Nondestructive Testing
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    • v.28 no.2
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    • pp.131-136
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    • 2008

  • Using ultrasonic standing waves, micro particles submerged or flowing in fluid can be manipulated. Due to acoustic radiation force of ultrasound, particles are forced to move to pressure nodal or antinodal lines. In this work, we propose a method to control the position of micro particle in a flow by adjusting the frequency of the standing wave. To this end, standing wave field generation system including a few millimeter thick micro channel was established using an immersible ultrasonic transducer. The present generation system works valid in a frequency range between 2.0 MHz and 2.5 MHz. We observed the SiC particles in water moved to pressure nodal lines by the standing wave. The effect of the channel thickness and operating frequency was also investigated. Interestingly, it was shown that the operating frequency have a close relation with the location of the pressure nodal line. Consequently, it fan be said that the position of particle movement rail be controlled by adjusting the ultrasound frequency. The maximum range of the controllable position was about 261 micrometers under the given condition. The resulted observations reveal the possibility of various applications of the ultrasonic standing wave to the manipulation of particles submerged in a fluid.

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개량형 Cd 증류장치 제작 및 시운전

  • Kim, Gyeong-Ryang;Kim, Gwang-Rak;Yun, Dal-Seong;Kim, Ji-Yong;Park, Dae-Yeop;Kim, Taek-Jin;Kim, Si-Hyeong;Jeong, Jae-Hu;Baek, Seung-U;Sim, Jun-Bo;An, Do-Hui
    • Proceedings of the Korean Radioactive Waste Society Conference
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    • 2011.05a
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    • pp.131-132
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    • 2011

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아르곤 분위기에서 카드뮴 상변화 모사

  • Kim, Gwang-Rak;Kim, Gyeong-Ryang;Jeong, Jae-Hu;Kim, Taek-Jin;Kim, Ga-Yeong;Sim, Jun-Bo;Kim, Si-Hyeong;Baek, Seung-U;Kim, Ji-Yong;Yun, Dal-Seong;Park, Dae-Yeop;An, Do-Hui
    • Proceedings of the Korean Radioactive Waste Society Conference
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    • 2011.10a
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    • pp.199-200
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    • 2011

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A Design of the Wideband Microstrip Patch Antenna Using Three-dimensional Transition (3차원 트랜지션을 이용한 광대역 마이크로스트립 패치 안테나의 설계)

  • 정창권;강치운;윤서용;이봉석;김우수;이문수
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.3 no.2
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    • pp.305-311
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    • 1999

  • In this paper, it is designed a new type single layer patch antenna which is printed on a very thin film and separated from the ground-plane by foam with a low permitivity of 1.06 and a high thickness of around quarter wavelength. It allows the use of three-dimensional transition, from one level to another, so that its bandwidth can be enhanced by wideband impedance matching. The radiation pattern, return loss, and VSWR of the antenna are calculated using "IE3D" simulation package, and compared with the experimental results. Experimental results show that the bandwidth is about 65% of center frequency 6.8 GHz, return loss and VSWR are in a fairly good agreement with the calculations.culations.

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