• Proceedings of the Korea Society for Industrial Systems Conference
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• 2002.06a
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• pp.53-55
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• 2002

본 연구는 자동차 급발진 사고에 관한 안전장치 개발에 그 목표를 두고 있다. 최근들어서 자동차 급발진 사고는 사회문제화되고 있고, 인명피해뿐만 아니라 자동차회사와 소비자간의 법적 피해 보상문제가지도 대두되고 있으며, 최근 자동차 설계구조의 문제가 있다는 법적 해석이 나오기도 했다. 본 연구는 자동변속기를 장착한 자동차의 급발진 방지용 변속레버 제어장치에 관한 것으로 구체적으로는 브레이크 페달을 밟고 있어야 변속레버조작이 이루어지도록 한 변속레버 제어수단을 솔레노이드 작동에 의한 스토퍼로 제어하되 스토퍼를 걸림 작동부로 간편하고 있도록 한 안전장치이다.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2008.06a
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• pp.523-524
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• 2008

전자빔의 산란에 의한 자기 공명현상과 지파 사이크로트론과의 상호작용에 의한 해석에서 체렌코프 발진이 일어나는 것은 확인하기 위하여 대구경 후진파 발진기를 이용한 실험을 하였다. 전자계와 전자빌의 상호작용을 위한 조절을 위하여 도파관의 반경과 진폭, 파장을 조절하였으며 이에 따른 주파수의 발진을 알수 있었다.

• Proceedings of the Optical Society of Korea Conference
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• 2003.07a
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• pp.8-9
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• 2003

본 연구에서는 연속발진 출력을 얻기 위해서 일차적으로 수소와 불소를 연소시켜 발생된 열에너지를 이용하여 불소분자($F_2$)를 원자상태의 불소(F)로 분리하고, 이 불소원자(F)를 초음속 노즐을 통해서 흐르게 한 후 중수소(D$_2$)와 화학 반응시켜 활성매질인 들뜬상태의 중수소분자(D$F_{*}$ )를 얻는다. 발진된 레이저 최대 출력 값은 약 11.5㎾이며, 발진라인은 10개로 최대 세기를 갖는 라인은 Pl(10)-3.752$\mu\textrm{m}$이다. 또한 최적의 유량조건에서 얻은 화학 효율은 약 16 %, specific power는 약 188J／g이다. (중략)

• Journal of the Korea Institute of Information and Communication Engineering
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• v.17 no.2
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• pp.273-279
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• 2013

In this paper, a novel split ring resonator is proposed for improvement of phase noise characteristics that is weak point of oscillator using planar type microstrip line resonator, and oscillator for 5.8GHz band is designed using proposed split ring resonator. At the fundamental frequency of 5.8GHz, 7.22dBm output power and -83.5 dBc@100kHz phase noise have been measured for oscillator with split ring resonator. The phase noise characteristics of oscillator is improved about 9.7dB compared to one using the general ${\lambda}$/4 microstrip resonator. Because it is possible that varactor diode or lumped capacitor is placed on the gaps of split ring resonator, resonant frequency can be controlled by bias voltage. We can design voltage controlled oscillator using proposed split ring resonator. Thus, due to its simple fabrication process and planar type, it is expected that the technique in this paper can be widely used for low phase noise oscillators for both MIC and MMIC applications.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.16 no.12
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• pp.2589-2594
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• 2012

In this paper, a novel resonator using ring type DGS is proposed for improvement of phase noise characteristics that is weak point of oscillator using planar type microstrip line resonator, and oscillator for 5.8 GHz band is designed using proposed DGS resonator. The ring type DGS resonator is composed of DGS cell etched on ground plane under $50{\Omega}$ microstrip line. At the fundamental frequency of 5.8 GHz, 7.6 dBm output power and -82.7 dBc@100kHz phase noise have been measured for oscillator with ring type DGS resonator. We designed the voltage controlled oscillator using proposed the DGS resonator with varactor diodes placed between gaps of DGS. Thus, due to its simple fabrication process and planar type, it is expected that the technique in this paper can be widely used for low phase noise oscillators for both MIC and MMIC applications.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.47 no.12
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• pp.68-74
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• 2010

A sub-${\mu}$W CMOS Wien-Bridge oscillator for ultra low power (ULP) radio applications is presented. The Wien-Bridge oscillator is based on an non-inverting opamp amplifier with a closed-loop gain $1+R_2/R_1$ as a means of providing necessary loop gain. An additional RC network provides appropriate phase shift for satisfying the Barkhausen oscillation condition at the given frequency of 1/($2{\pi}RC$). In this design, we propose a novel loop gain control method based on a variable capacitor network instead of a rather conventional variable resistor network. Implemented in $0.18{\mu}m$ CMOS, the oscillator consumes only 560 nA at the oscillation frequency of 22 kHz.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.21 no.2
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• pp.202-207
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• 2010

In this paper, a novel voltage-controlled oscillator(VCO) using the open loop multiple split ring resonator(OLMSRR) is presented for improving the phase noise, implemented in 130 nm CMOS technology. Compared with the conventional CMOS LC resonator, the proposed CMOS OLMSRR has the larger coupling coefficient value, which makes a higher Q-factor, and has improved the phase noise of the VCO. The proposed CMOS VCO based OLMSRR has the phase noise of -99.67 dBc/Hz @ 1 MHz in the oscillation frequency. Compared with the VCO using the conventional CMOS LC resonator and the proposed VCO using the CMOS OLMSRR structure has been improved in 7 dB. The prototype 24 GHz CMOS VCO is implemented in 130 nm CMOS and occupies a compact die area of $0.7\;mm{\times}0.9\;mm$.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.16 no.8
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• pp.1581-1586
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• 2012

In this paper, a novel resonator using ring type DGS is proposed for improvement of phase noise characteristics that is weak point of oscillator using planar type microstrip line resonator, and oscillator for 5.8GHz band is designed using proposed DGS resonator. The ring type DGS resonator is composed of DGS cell etched on ground plane under $50{\Omega}$ microstrip line. At the fundamental frequency of 5.8GHz, 7.6dBm output power and -82.7 dBc@100kHz phase noise have been measured for oscillator with ring type DGS resonator. The phase noise characteristics of oscillator is improved about 9.5dB compared to one using the general ${\lambda}/4$ microstrip resonator. Because it is possible that varactor diode or lumped capacitor is placed on the gaps of ring type DGS, resonant frequency can be controlled by bias voltage. We can design voltage controlled oscillator using proposed ring type DGS resonator. Thus, due to its simple fabrication process and planar type, it is expected that the technique in this paper can be widely used for low phase noise oscillators for both MIC and MMIC applications.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.42 no.11
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• pp.45-52
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• 2005

In this paper, we propose the PLL system of the local oscillator system for the millimeter wave band's radio astronomy receiving system. The development of the proposed local oscillator system based on the YIG oscillator VCO with $26.5\~40GHz$ specification. This system consists of the oscillator part including the YIG VCO, the harmonic mixer, and the isolator, the RF processing part including the triplexer, limiter, and RF discrimination processor, and the PLL system including YIG modulator and controller. Based on this configuration, we verify the frequency and power stability of the developed local oscillator system according to some temperature variation. From this test results we confirm the stable output frequency and power characteristic peformance of the developed LO system at constant temperature.

• Journal of the Institute of Electronics Engineers of Korea SC
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• v.40 no.6
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• pp.8-15
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• 2003

In this paper, the issue of the differential ring oscillator in designing low phase noise is linearity improvement of delay cell's load resistor. A novel differential delay cell that improves on the Maneatis load is proposed. The linearity improvement of load resistor results in lower phase noise in ring oscillator. For comparison of the phase noise characteristics, Ali Hajimiri's phase noise model is used. In order to have a low ISF(impulse sensitivity function), it is important to have a symmetry between rise time and fall time of oscillation waveform. The ISF value of ing oscillator based on the proposed delay cell is lower than that of the existing ring oscillators. Due to this result, the phase noise is improved by 2~3dBc/Hz for the same power dissipation and oscillation frequency.