• 제목/요약/키워드: Chracteristics

검색결과 209건 처리시간 0.038초

Al$_2$O$_3$가 첨가된 ZnO의 전기특성변화 (Electrical Chracteristics of $Al_2$O$_3$ doped ZnO)

  • Park, U-Sung-;Park, Choon-Bae-
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 1994년도 추계학술대회 논문집
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    • pp.17-20
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    • 1994

  • Electrical Chracteristics of ZnO doped with Al$_2$O$_3$were investigated using complexe impedence measurements. The electrical conductivity of ZnO samples increased whithin 0.5mol% of Al$_2$O$_3$ doping, but decreased abode 0.5mol%. The increase and decrease of electrical conductivity seem to be the effect of Al$_2$O$_3$ doner doping and increasement of the number of grain boundary ZnO, respectively.

이온 분석기에 의한 ECR 플라즈마의 특성 분석 및 실리콘 식각에 관한 연구 (Characterization of ECR Plasma by Using Ion Analyzer and Its Silicon Etching)

  • 이석현;이호준;황기웅
    • 대한전기학회논문지
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    • 제41권5호
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    • pp.492-501
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    • 1992

  • In this paper, an ion analyzer is used in conjunction with a Langmuir probe to study the chracteristics of ECR plasma such as the ion temperature, ion current density and electron temperature as the operating pressure, ${\mu}$-wave power and axial position change, Silicon etching has been performed with RF-biasing and its etching chracteristics have been discussed in terms of the ion energy distribution function. The maximum value of ion current density appears in the range of 10S0-3T mbar and the broadening of ion energy distribution function increases as pressure increases. Therefore, as pressure decreases, anisotropy increases but selectivity to photoresist decreases.

VCO 공진부의 Q-factor 특성향상에 관한 연구 (A study on the improvement in Q-factor chracteristics of VCO resonance part)

  • 이현종;김인성;민복기;송재성
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2005년도 제36회 하계학술대회 논문집 B
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    • pp.1506-1508
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    • 2005

  • VCO(voltage controlled oscillator) using mobile communication device decides direct characteristics as parts that affect important in stable oscillation and distortion characteristics of system. VCO used 900 MHz band was designed by the transformation of Colpitts circuit form use ADS that consider Q-factor to minimize phase noise. VCO manufactured together evaluation board and voltage control oscillator to FR-4 PCB. VCO experimented chracteristics after control through resonance department tuning. In our research, the designed VCO has 15.5 dBm output level at the bias condition of 6V and 10mA and the operating frequency range of 917 MHz$\sim$937 MHz band. Phase noise is -98.28 dBc/Hz at 1 MHz frequency offset from the carrier.

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ON THE CHARACTERISTIC RING-MODULES

  • Park, Chin-Hong
    • 대한수학회보
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    • 제32권2호
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    • pp.145-152
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    • 1995

  • From now on, we assume that a ring R has an identity 1. We have the following Lemma from Park[2].

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