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능동 전자주사식 위상배열 레이다용 N-Way 보정선로 설계 및 제작
정구호,정윤권,김태완,최준호 한국전자파학회 2023 한국전자파학회논문지 Vol.34 No.8
In this study, we describe the design and fabrication of an N-way calibration line for an active electronically scanned array radar. The designed calibration line consisted of an open-ended probe and a Wilkinson power divider. It was designed to calibrate by measuring the amplitude and phase of the transmit/receive path. In addition, the signals from the array antenna and transmit/receive module could be transmitted to a calibration assembly using the open-ended probe and power divider. A multilayer printed circuit board (PCB) was used for miniaturization. We described the mechanism and design process of signal transmission through the calibration line. In addition, we described the issue of an N-way calibration line design without a uniform phase distribution of the output ports. This in- dicated that the signal could not be transmitted at a specific frequency through a random output port. The proposed calibration line was designed to achieve a uniform phase distribution. A calibration line was designed, measured, and tested to validate its performance.
토끼풀에서 분리한 Peanut stunt virus의 성질
정구호,최장경,홍진성,류기현,이상용,전용운 한국식물병리학회 2008 식물병연구 Vol.14 No.1
An isolate of Peanut stunt virus (PSV), named as Tr-PSV, was isolated from white clover (Trifolium repens L) showing mosaic symptom. Tr-PSV systemically infected all plants tested in the Nicotiana spp. and induced local lesions on inoculated leaves of Chenopodium amaranticolor. However, Tr-PSV induced typical mosaic symptoms as ER-PSV on Vigna unguiculata 5 to 6 days after inoculation, while Fny-CMV used as a control virus of Cucumovirus produced local lesions on inoculated leaves. In dsRNA analysis, Tr-PSV consisted of four dsRNAs, but satellite RNA was not detected. The cDNA of coat protein gene of Tr-PSV was amplified by RT-PCR using a Cucumovirus-specific single pair primers that designed to amplify a DNA fragment of approximately 950 bp. By restriction mapping analysis using RFLP of the RT-PCR products and by serological properties of gel diffusion test, Tr-PSV belongs to a typical member of PSV subgroup I. This is the first report on the occurrence of PSV in white clover in Korea. An isolate of Peanut stunt virus (PSV), named as Tr-PSV, was isolated from white clover (Trifolium repens L) showing mosaic symptom. Tr-PSV systemically infected all plants tested in the Nicotiana spp. and induced local lesions on inoculated leaves of Chenopodium amaranticolor. However, Tr-PSV induced typical mosaic symptoms as ER-PSV on Vigna unguiculata 5 to 6 days after inoculation, while Fny-CMV used as a control virus of Cucumovirus produced local lesions on inoculated leaves. In dsRNA analysis, Tr-PSV consisted of four dsRNAs, but satellite RNA was not detected. The cDNA of coat protein gene of Tr-PSV was amplified by RT-PCR using a Cucumovirus-specific single pair primers that designed to amplify a DNA fragment of approximately 950 bp. By restriction mapping analysis using RFLP of the RT-PCR products and by serological properties of gel diffusion test, Tr-PSV belongs to a typical member of PSV subgroup I. This is the first report on the occurrence of PSV in white clover in Korea.
100 kVA GTO 전압원 인버터를 사용한 정지형 무효전력보상기
최남섭,조국춘,정구호 여수대학교 1998 論文集 Vol.13 No.2
A stactic VAR compensator using 100 kVA three-level GTO voltage source inverter is presented for high voltage, high power application. The phase angle of the voltage source inverter is controlled so as to compensate the reactive power of some three-phase load. This paper deals with the following topics: system description, circuit DQ modelling, main controller, power circuit. The experimental results show good characteristics for var compensation.
온라인 전기 자동차를 위한 비접촉 유도 전력 전달 시스템
정구호(Gu-Ho Jung),이경훈(Kyung-Hun Lee),김형국(Hyung-Guk Kim),조양진(Yang-Jin Cho),송보윤(Bo-Yun Song),손영동(Young-Dong Son),박은하(Eun-Ha Park),최주영(Ju-Young Choi),공병오(Byung-O Kong),허진(Jin Huh),손호섭(Ho-Sub Son),조정구(Jung- 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
온라인 전기자동차는 도로에 매설된 급전선로로부터 유도자계를 통하여 비접촉 방식으로 전기를 집전 받아 정차 및 주행 중에 충전하는 자동차이다. 이러한 비접촉 충전을 위해서는 도로에 매설된 급전 시스템과 차량 하부에 장착된 집전 시스템으로 구성된 비접촉 유도전력 전달(IPT, Inductive Power Transfer) 시스템이 필요하며, 급전 시스템은 다시 급전 인버터와 급전선로로, 집전 시스템은 집전 모듈(pick-up)과 집전 레귤레이터로 구성된다. 본 논문에서는 이러한 비접촉 IPT 시스템 각각의 장치를 소개하며, 더불어 구축된 시스템의 성능에 대해서도 소개한다.
정구호(Gu-Ho Jeoung),이성규(Seong-Kyu Lee),최재훈(Jae-Hoon Choi) 한국전자파학회 2016 한국전자파학회논문지 Vol.27 No.12
본 논문에서는 캐비티 백(Cavity-back) 구조를 이용한 신호 정보 수집용 광대역 안테나를 제안하였다. 제안된 안테나는 캐비티 구조를 가지는 접지면, 마이크로스트립 급전선, 슬롯이 식각된 사각패치로 이루어져 있다. 제안된 안테나는 55 mm×40 mm×10 mm의 크기에서 캐비티 구조를 통해 광대역의 대역폭을 갖는다. 안테나의 측정된 10 dB 반사손실 대역폭은 5,030 MHz(3.02~8.05 GHz)이며, 중심주파수 5.05 GHz에서 비 대역폭 90.9 %을 가진다. ANSYS사의 HFSS v.15.0.0을 이용하여 제안된 안테나의 설계 및 시뮬레이션을 수행하였다. 제작 및 측정을 통해 안테나의 성능 및 설계방법의 타당성을 검증하였다. In this paper, a cavity back slot antenna with a rotated rectangular patch is proposed. The proposed antenna consists of a ground plane with cavity structure, a microstrip feed line, and a rectangular patch with slot. With a dimension of 55 mm×40 mm×10 mm, the proposed antenna has the wide bandwidth due to the cavity structure. Measured 10 dB return loss bandwidth and fractional bandwidth of the proposed antenna is 5,030 MHz(3.02~8.05 GHz) and 90.9 % at the center frequency of 5.05 GHz. The proposed antenna is designed and simulated using ANSYS HFSS v.15.0.0. The designed antenna is fabricated and tested to validate its performances.
대용량 고전압 부하의 무효전력 및 고조파 보상을 위한 낮은 DC 전압을 갖는 새로운 능동 파워 필터
정구호(Gu H. Jung),조규형(Gyu H. Cho) 전력전자학회 1998 전력전자학술대회 논문집 Vol.- No.-
This paper presents a new active power filter with low DC voltage for compensating reactive power and harmonics of three -phase high power/voltage harmonic producing load. It has a structure of converter connected in series with power factor correction capacitor. Appropriate size and number of filter capacitor are determined by an equation and applied to simulation of 10kvar 6-pulse SCR rectifier.<br/>