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

  • 정근욱;이재현;유경완;강성춘
    • Journal of the Korean Institute of Telematics and Electronics D
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    • v.34D no.10
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    • pp.53-59
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    • 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.

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

  • 장극관;천영수
    • Journal of the Earthquake Engineering Society of Korea
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    • v.2 no.4
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    • pp.191-197
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    • 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.

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

  • 장일영;송재호;박훈규;황규철
    • Proceedings of the Korea Concrete Institute Conference
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    • 2001.05a
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    • pp.207-212
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    • 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

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

  • Lee, Sang-Seung;Park, Jong-Keun
    • Proceedings of the KIEE Conference
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    • 1997.07c
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    • pp.1171-1173
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    • 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).

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

  • Son, Hong-Bae;Kim, Min-Seok;Kang, Jung-Won
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.46 no.8
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    • pp.6-11
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    • 2009
  • The electro-optical characteristics of the Liquid Crystal on Silicon (hereinafter "LCOS") micro-display on vertically alignment (VA) mode were studied with 3-dimensional LC code. 5 different cell gaps, such as 1.4 ${\mu}m$, 1.8 ${\mu}m$, 2.1 ${\mu}m$, 2.4 ${\mu}m$ and 2.8 ${\mu}m$, were selected. The reflectance-voltage (R-V) characteristics, distribution of reflected light, reflectance, optical fill factor and contrast ratio were calculated and investigated depending on various cell gaps. Due to the surface anchoring effect, higher cell gap showed higher reflectance. However, considering the optical fill factor and contrast ratio, middle-height 2.1 ${\mu}m$ showed the best electro-optical characteristic. 0.7 inch Full-HD LCOS panels having same geometry and material property were fabricated. The reflected light intensity and contrast ratio were measured and the measured results were well-matched to the calculated results.

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

  • Kim, Sun-Hee
    • Women's Health Nursing
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    • v.26 no.4
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    • pp.326-335
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    • 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

  • Shin, Jae-Min;Im, Jeong-Heum;Kim, Eung-Hyun;Lee, Sang-Kon;Lee, Sang-Ryool
    • Aerospace Engineering and Technology
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    • v.3 no.2
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    • pp.34-41
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    • 2004
  • In this paper, the SAR operational mode for achieving mission is designed. Each mode, which is the strip mode, scan mode, and fine mode, is basically considered. Based on the characteristics, which includes incidence angle, of the topography in Korean Peninsula, look angle for SAR satellite is determined. The limited region of operating the mission, which is considered to be able to receive and transmit the radar data, was defined to use determined operational mode. In the future, as considering full requirements and conditions for the SAR satellite, requirements and parameters will be discussed and studied.

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