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권혁록(Hyuk Rok Gwon),이성혁(Seong Hyuk Lee) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
The present study discusses on the dielectrophoretic (DEP) characteristics, affected by the magnitude and polarity of the charges induced in a particle by the applied field, for dielectric particles suspended in deionized water sessile droplet. The ac frequency ranging from 100 Hz to 10 ㎒ is exerted on the DEP patterns to find a critical transition frequency (CTF) from positive DEP to negative DEP phenomena, and the measured CTF values are compared with the theoretical estimation. This study uses the polystyrene dielectric beads with different diameters, i.e., 0.49 ㎛, 1.0 ㎛, and 5.0 ㎛, and moreover the well-established photo lithography and metal sputtering processes are utilized for fabrication of a designed DEP pattern. From the results, it is found that the measured CTF values are approximately 3.5 MHz, 800 ㎑, and 150 ㎑ for 0.49 ㎛, 1.0 ㎛ and 5.0 ㎛ polystyrene beads, respectively, suggesting that they should be determined by considering the dependency of particle size on the transition of DEP forces.
고감도 단금속 및 쌍금속 표면 플라즈몬 공명 센서 설계를 위한 수치해석 연구
권혁록(Hyuk Rok Gwon),이성혁(Seong Hyuk Lee) 대한전기학회 2009 전기학회논문지 Vol.58 No.4
Surface plasmon resonance (SPR) has been widely used for biological and chemical sensing applications. The present study investigates numerically the optical characteristics for the single Au film and bimetallic Ag/Au film SPR configurations by using the multiple beam interference matrix (MBIM) method. We use the prism coupling method, especially Kretschmann configuration for excitation of surface plasmon wave (SPW). The estimated results of reflectance, phase shift and magnetic field intensity enhancement factor are provided for finding out the optimum configuration with high sensitivity for SPR measurement. As a result, the optimum thicknesses are found to be 52 ㎚ for a single Au film and 5 ㎚ to 36 ㎚ for bimetallic Ag-Au film. From the comparison of full width half maximum (FWHM) values for reflectance, phase shift, and enhancement of magnetic field intensity, it is concluded that the highest sensitivity can be obtained when using the phase shift for SPR sensor.
정압기지내의 안전밸브 분출용량 관계식 검증을 위한 유동해석 (II)
권혁록(Hyuk Rok Gwon),노경철(Kyung Chul Roh),김영섭(Young Seop Kim),이성혁(Seong Hyuk Lee) 한국가스학회 2008 한국가스학회지 Vol.12 No.2
안전밸브는 정압기지 내에 정압기의 파괴 또는 관 내 수분의 응축 등으로 인한 관내 압력의 비정상적인 증가를 자동적으로 완화시켜주는 메커니즘을 가지고 있는 밸브이다. 따라서 정압기지의 안전을 위해서 안전밸브의 유동 특성과 유동 형태를 살펴보는 것은 매우 중요하다. 본 논문은 안전밸브의 분출용량과 필요분출면적에 따른 유동 특성을 수치해석을 통해서 분석하였다. 본 결과를 국내·외 안전밸브 관련 규정인 미국의 API(America Petroleum Institute), 유럽 연합의 EN(European Standard), 프랑스의 NF(Norme Francise)를 이용하여 분석, 비교하였다. 또한 안전밸브의 최대 필요 분출 면적을 이용하여 국내 및 국외 규정을 각각 적용하였을 때의 안전밸브의 필요 설치 수량에 대한 고찰을 해보았다. A safety valve has a valve mechanism for the automatic release of gas from piping system when the pressure exceeds preset limit cause of a defect of a pressure regulator, condensation of water in a pipe. Therefore, for the safety of pressure regulating station, it is essential to study the flow regime and characteristics of safety valve. This article presents the numerical analysis on the flow analysis, the ejection capacity and required effective discharge area of the safety valve that is established in pressure regulating station. Then, the results are compared and analyzed with domestic and foreign regulations such as API(America Petroleum Institute), EN(European Standard), and NF(Norme Francise). Moreover, the installation number of safety valve is considered by using domestic and foreign regulations and maximum reguired effective discharge area of safety valve.
액체 전극을 이용한 새로운 유전영동 입자 제어 기술 개발
권혁록(Hyuk Rok Gwon),이성혁(Seong Hyuk Lee) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
Developing an efficient manipulation technique of cells is one of key issues in achieving high sensing performance of lab on a chip device. Dielectrophoresis (DEP) has many advantages for manipulating particles and cells compared with other manipulation techniques because most of cells have distinguishing dielectric properties. However, it is difficult to manipulate particles and cells actively with conventional DEP system. For active manipulation, the present study suggests a new DEP system for manipulating yeast cells with liquid electrodes. We designed a new DEP system with ITO glass and SU-8 based liquid electrode micro-channel and poly-dimethyl-siloxane (PDMS) chamber. PDMS chamber has thin PDMS layer on the bottom by PDMS squeezing method. The effect of AC electric field strength and frequency were experimented. With the designed DEP chip, yeast cells collection efficiencies and dielectrophoretic velocities were measured for various AC electric field strengths and frequencies. Consequently, by using these results, active manipulation of cells may be possible with a new liquid electrode DEP technique.