• 제목/요약/키워드: full-mode

검색결과 880건 처리시간 0.03초

모드정합법을 이용한 20GHz 저손실 이중모드 채널여파기 (A 20 GHz low-loss dual - mode channel filter using mode matching method)

  • 정근욱;이재현;유경완;강성춘
    • 전자공학회논문지D
    • /
    • 제34D권10호
    • /
    • pp.53-59
    • /
    • 1997
  • In this paper, we present a 20 GHz low-loss dual-mode channel filter designed by using mode matching method. The performance of dual-mode channel filter mainly depends on iris characteristics. Therefore the exact design of iris is the key point to get good frequncy response of the filter. MOde matching technique is widely used ot design several kinds of waveguide filters because it is simple in theory and can easily calculate the scattering matrices at the discontinuities with simple structure like iris coupled filters. Additionally the effect for finite thickness of the iris in the dual-mode cavity iflter is analyzed by te full-wave method, providing the exact filter implementation without trial and error.

  • PDF

모드해석을 통한 벽식구조 아파트건물의 System Identification (System dentification of Apartment Buildings with Wall-Slab configuration using Modal Analysis)

  • 장극관;천영수
    • 한국지진공학회논문집
    • /
    • 제2권4호
    • /
    • pp.191-197
    • /
    • 1998
  • This paper described the dynamic characteristics of 20-story apartment buildings from the results of full-scale measurements and analysis. The natural frequencies and mode shapes are quantified by measuring and analyzing ambient vibrations of the structure and compared with the results from dynamic analysis. Comparison with computed mode shapes and frequencies shows good agreement with the experimental results. It proved that it is important to estimate coupling beam and soil parameters through a comparison of the measured results with calculated results.

  • PDF

전단내력 감소식을 이용한 고강도 콘크리트 보의 파괴형식 판정 연구 (Decision of Ultimate Failure Mode of High-Strength Concrete Beams Using Degrading Shear Strength Model)

  • 장일영;송재호;박훈규;황규철
    • 한국콘크리트학회:학술대회논문집
    • /
    • 한국콘크리트학회 2001년도 봄 학술발표회 논문집
    • /
    • pp.207-212
    • /
    • 2001
  • The aim of this study is to present a practical and simple method for decision of ultimate failure mode of high-strength concrete beam members, based on interaction between shear strength and displacement ductility. Four tests were conducted on full-scale beam specimens having concrete compressive strength of 410kgf/$cm^{2}$. Prediction of failure mode from presented method and comparison with test results are also presented

  • PDF

전력계통안정기를 위한 폐-루우프 피이드백을 가진 전-차수 관측기에 기준한 SM-MF 제어기 설계 : Part4 (Design of Full-Order Observer-based SM-MF Controller including CLF for Power System Stabilizer : Part 4)

  • 이상성;박종근
    • 대한전기학회:학술대회논문집
    • /
    • 대한전기학회 1997년도 하계학술대회 논문집 D
    • /
    • pp.1171-1173
    • /
    • 1997
  • This paper presents the sliding mode observer-model following(SMO-MF) power system stabilizer(PSS) for unmeasurable plant state variables. This SMO-MF PSS can be obtained by combining the sliding mode-model following(SM-MF) including closed-loop feedback(CLF) with the linear foil-order observer(LFOO).

  • PDF

Full-HD LCOS Panel의 Cell Gap의 변화에 따른 전기광학적 특성에 대한 연구 (A Study of Electro-optical Characteristics of Full-HD LCOS Panel Depending on Various Cell Gaps)

  • 손홍배;김민석;강정원
    • 대한전자공학회논문지SD
    • /
    • 제46권8호
    • /
    • pp.6-11
    • /
    • 2009
  • VA Mode LC를 사용하는 Full-HD급 LCOS 마이크로디스플레이에서 셀 상하 간격의 변화에 따른 전기광학적 특성의 변화에 관하여 3차원 LC code를 이용하여 연구하였다. 5가지의 다른 셀 상하 간격 (1.4 ${\mu}m$, 1.8 ${\mu}m$, 2.1 ${\mu}m$, 2.4 ${\mu}m$ 그리고 2.8 ${\mu}m$)의 변화에 따라 Reflectance-Voltage 특성, 반사광 및 반사율 분포, Optical Fill Factor 그리고 명암비를 비교하였다. Surface Anchoring 효과에 의해 상하 간격이 증가하면서 반사율은 증가하였으나 Optical Fill Factor와 명암비를 고려할 경우, 중간 수준의 간격인 2.1 ${\mu}m$ 의 특성이 가장 우수함을 확인할 수 있었다. 동일한 구조를 갖고 있는 0.7 인치 LCOS 패널을 제작하여 광학적 측정을 해 본 결과 시뮬레이션 결과와 통일함을 확인할 수 있었다.

산후 2주 축약형 모유수유 적응 측정도구의 구성 타당도, 신뢰도와 측정 불변성 (Breastfeeding Adaptation Scale-Short Form for mothers at 2 weeks postpartum: construct validity, reliability, and measurement invariance)

  • 김선희
    • 여성건강간호학회지
    • /
    • 제26권4호
    • /
    • pp.326-335
    • /
    • 2020
  • Purpose: This study was conducted to evaluate the construct validity, reliability, measurement invariance, and latent mean differences in the Breastfeeding Adaptation Scale-Short Form (BFAS-SF) for use with mothers at 2 weeks postpartum. Methods: This methodological study was designed to evaluate the validity, reliability, and measurement invariance of the BFAS-SF at 2 weeks postpartum, with data collected from 431 breastfeeding mothers. Confirmatory factor analysis and multi-group confirmatory factor analysis were conducted to assess the factor structure and the measurement invariance across employment status, delivery mode, parity, and previous breastfeeding experience, and the latent mean differences were then examined. Results: The goodness of fit of the six-factor model at 2 weeks postpartum was acceptable. Multi-group confirmatory factor analysis supported strict invariance of the BFAS-SF across employment status and delivery mode. Full configural invariance, full metric invariance, and partial scalar invariance across parity and full configural invariance and full metric invariance across previous breastfeeding experience were supported, respectively. The results for latent mean differences suggested that mothers who were employed showed significantly higher scores for breastfeeding confidence. Mothers who had a vaginal delivery showed significantly higher scores for sufficient breast milk and baby's feeding capability. Multiparous mothers showed significantly higher scores for baby's feeding capability and baby's satisfaction with breastfeeding. Conclusion: The validity and reliability of the BFAS-SF at 2 weeks postpartum are acceptable. It can be used to compare mean scores of breastfeeding adaptation according to employment status, delivery mode, and parity.

한반도 지형에 적합한 SAR 위성의 운영모드 설계

  • 신재민;임정흠;김응현;이상곤;이상률
    • 항공우주기술
    • /
    • 제3권2호
    • /
    • pp.34-41
    • /
    • 2004
  • 본 논문에서는 SAR 위성시스템 설계에서 위성의 임무를 적절히 수행할 수 있는 위성의 운영모드 설계를 수행하였다. strip mode, scan mode, fine mode 3가지 모드에 대한 기본적인 고찰이 이루어졌으며 위성의 Look angle 결정을 위해 Incidence angle을 고려한 한반도의 지형적인 고찰도 함께 이루어졌다. 결정된 운영 모드를 이용하기 위해서 위성의 임무 수행지역을 정의하였고 정의된 수행지역은 위성의 레이다 자료의 송수신을 고려하여 결정 되었다. 현재 구성된 사항들은 추후 더욱 상세한 요구사항들과 조건들을 고려하면서 연구될 것이다.

  • PDF