• Proceedings of the KIPE Conference
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• 2019.11a
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• pp.158-159
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• 2019

본 논문은 전기자동차용 inductive power tranasfer (IPT) 방식의 양방향 무선전력전송에 활용 가능한 공진 네트워크를 선정한다. 각 공진 네트워크별 수식 분석을 통해 패드의 인덕턴스를 설계하고, 공진 네트워크 종류에 따라 달라지는 출력 특성을 분석한다. 분석 결과를 바탕으로 IPT 방식의 양방향 무선전력전송을 위한 공진 네트워크를 선정하고 시뮬레이션을 통하여 선정한 네트워크의 적합성을 검증한다.

• Proceedings of the KIPE Conference
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• 2019.11a
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• pp.28-30
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• 2019

본 논문은 차량용 12V 배터리 전원을 이용한 캠핑용 Induction Cooker를 설계한다. 캠핑용 Induction Cooker의 전력변환장치에 적합한 DC-link 전압 (V_DC) 및 동작 주파수(f_sw)를 선정하기 위해 각 조건에 따른 전력변환장치의 공진 네트워크를 설계한다. 또한 이론적 분석 및 시뮬레이션을 통해 각 조건별 전력반도체 소자에서 발생하는 손실 비교 분석을 수행한다. 분석 결과를 통해 공진 네트워크의 적합한 V_DC 및 f_sw를 선정한다.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.16 no.4
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• pp.311-316
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• 2003

Effects of pores on the microwave properties in microwave dielectric ceramics were studied by a computer simulation. Scattering matrix S$\_$21/ obtained from the network analyzer was compared to the S$\_$21/ obtained from the simulation. From electric field distribution, the dominant resonant TE$\_$01$\delta$/ mode could be easily determined. The effects of the porosity and pore size inside the dielectrics on the microwave properties were investigated by the HFSS simulation. When the total pore volume remains constantly, the quality factor decreased as the pore size Increases. As the total pore volume of the dielectrics increased. quality factor decreased.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 1998.06a
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• pp.41-44
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• 1998

Dual mode resonators were fabricated using high temperature superconductor. The deposited material was $Y_1Ba_2Cu_3O_{7-x}$(YBCO) on MgO(100) substrate using pulsed laser deposition. Dual mode resonators were patterned by standard photolithography process and wet etching. At the back-side of the substrate, the ground plane with the metal layer of Ti and Ag was fabricated. The transition temperatures of YBCO films were 85-88 K, and network analyzer was used for testing the performance of the resonators. The input/output feedline angles of each resonator were $60^{\circ}$and $100^{\circ}$. The resonant frequency of resonators was 10 GHz. In this paper, dual mode resonator was fabricated for the application of satellite communication.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.30 no.3
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• pp.65-72
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• 2016

This paper discussed the LCL-type & Isolated bidirectional dc-dc converter(BDC) with dual full bridge inverter. In order to verify the analysis of the BDC, Experimental prototype has been designed and implemented to supply constant voltage regardless of loads and proposed a method to select switching frequency that depended on two inductors' inductance ratio and transformer parameters. The proposed converter has been composed of LCL resonant network with unit inductance ratio ($L_r/L_f$=1) and then operated with fixed duty, 50% duty ratio and fixed frequency. There are some characteristics that input voltage and output voltage of the BDC is nearly identical and zero voltage turn-on switching is possible in forward and reverse mode. Finally, it has been showed that BDC is possible to commutate operating mode normally and provide constant output voltage in selected switching frequency.

• Proceedings of the KIPE Conference
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• 2017.07a
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• pp.44-45
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• 2017

본 논문에서는 비자성체 용기 가열이 가능한 Induction Cooker의 공진 네트워크를 설계한다. 용기 재질에 따른 워킹코일의 R, L 파라미터를 고려한 최적 동작 주파수 및 커패시턴스를 선정하여 시스템을 설계한다. 또한 설계한 시스템의 가열 성능을 시뮬레이션 및 실험을 통해 검증한다.

• Proceedings of the KIEE Conference
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• 2006.07c
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• pp.1301-1302
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• 2006

In this paper, embedded spiral inductors are investigated into the PCB substrate for low cost RF SOP applications. The spiral inductors designed with geometrical variations were simulated, fabricated, measured, and characterized by using 3D EM simulator, 8 layered PCB standard process and HP 8510B network analyzer (or verifying their applicability. The fabricated embedded spiral inductor has inductance of 9.4 nH at 800MHz, maximum quality factor of 64.8 at 1.09GHz and self resonant frequency of 3.93GHz, respectively. As the measured inductances and quality factors are well matched with simulated ones. PCB embedded spiral inductors are promising for advanced electronic systems with various functionality, low cost, small size and volume.

• 한국정보통신설비학회:학술대회논문집
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• 2008.08a
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• pp.433-436
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• 2008

In this paper, a novel compact broadband dual frequency microstrip antenna is presented. The meander type patch has been designed to have dual resonant frequencies, and the ground with slot was employed to expand the bandwidth in WCDMA band. The simulated results were obtained using HFSS, and the measurement on the proposed antenna was conducted in an anechoic chamber equipped with a network analyzer and a far field measurement system. As a result, measured maximum gain of antenna is 2.07$\sim$2.87 dBi in the GSM band and 3.91$\sim$5.61 dBi in the WCDMA band.

• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.1599-1600
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• 2007

The DTL water skid cooling system and Resonant Control Cooling Systems (RCCS) will employ a control system that can be operated by a local, programmable logic controller (PLC), interfaced through a touch screen interface, mobile alarm SMS server system, or it can be operated through the PEFP global control system network. The RCCS is implemented using Experimental Physics and Control System (EPICS) based hardware and software and is integrated with other networked PEFP EPICS systems. This presentation discusses the features of the local control system.

• Proceedings of the KIPE Conference
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• 2015.11a
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• pp.38-39
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• 2015

본 논문에서는 정전압 특성을 갖는 SP 토폴로지 공진네트워크에 대한 설계 방법을 제시한다. 주어진 설계 사양을 기반으로 도출 가능한 인덕턴스 값에 따라 소자 스트레스 및 수직 수평 이격에 따른 결합계수 k 변동을 고려한 공진 네트워크를 설계한다. 이에 따라 설계된 SP 토폴로지의 시뮬레이션 및 실험을 통해 설계 과정의 타당성을 검증한다.