• 제목/요약/키워드: Polarization index

검색결과 177건 처리시간 0.025초

도파로의 편광 의존성에 경계면이 미치는 효과와 편광 독립적인 InP형 배열 도파로 회절 격자 소자를 위한 2차원 광 도파로의 설계 (The interface effects on polarization dependence of waveguide and the design of polarization independent 2 dimensional waveguide on InP for arrayed waveguide grating)

  • 김동철;최정훈;유건호;김형문;주흥로;김홍만
    • 한국광학회지
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    • 제9권5호
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    • pp.307-314
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    • 1998
  • 편광 독립적인 InP형 배열 도파로 회절 격자 소자의 설계를 위하여 경계면이 편광 의존성에 미치는 효과를 살펴보고, 편광 독립적인 InP형 2차원 도파로를 설계하였다. 도파로의 경계면이 편광 의존성에 미치는 효과를 살펴보기 위하여 1차원 도파로에 대하여 넘김 행렬법(Transfer Matrix Method)을 사용하여 파동 방정식을 풀었다. 계산 결과 경계면이 많을수록 복굴절성은 커짐을 보였다. 편광 독립적인 2차원 도파로 설계에는 유효굴절률법(Effective Index Method)을 사용하였다. 고려한 구조는 리지형태(ridge type), 올림층형태(raised strip type), 매립형태(buried type)의 도파로인데, 리지형태와 올림층형태의 구조에는 기존의 유효굴절법을 적용하였고, 매립형태의 도파로는 개선된 유효굴절률법을 적용하였다. 계산 결과로부터 편광 독립적인 2차원 도파로의 폭과 높이를 결정하였고, 주어진 복굴절성의 한계에 대하여 허용될 수 있는 도파로의 폭과 높이의 허용오차도 논의하였다.

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굴절률에 의한 유전상수와 전자에 의한 분극에 대한 상관성 (Correlation between Dielectric Constant and Electronic Polarization by the Reflective Index)

  • 오데레사
    • 한국진공학회지
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    • 제18권1호
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    • pp.24-29
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    • 2009
  • 층간 절연막으로 사용 가능한 SiOC 박막에 대하여 유전상수가 낮아지는 원인을 이온에 의한 분극과 전자에 의한 분극에 대하여 측정하였다. MIS 구조를 이용하여 전형적인 C-V측적법에 의하여 유전상수를 구하였으며, 굴절률을 측정하여 전자에 의한 분극의 효과에 의한 유전상수를 측정하고 서로 비교하였다. SiOC 박막의 화학적인 특성은 FTIR 분석을 이용하였으며, FTIR 분석에서 디컨벌류션한 데이터는 탄소의 함량에 대한 변화를 구하였다. 탄소의 함량변화는 굴절률의 변화와 비슷한 경향성을 나타내었으나, 유전상수와는 반비례하였다. 전자에 의한 분극의 효과는 유전상수가 떨어지는 것에 큰 영향을 주지는 않았으며, 이온에 의한 분극의 효과가 SiOC 박막의 유전상수를 낮게 하는 효과가 더욱 크게 나타났다.

NEW RETRIEVAL METHOD FOR AEROSOL OPTICAL PARAMETERS USING DIRECTIONAL REFLECTANCE AND POLARIZATION DATA BY POLDER ON BOARD ADEOS

  • Kawata, Yoshiyuki;Izumiya, Toshiaki
    • 대한원격탐사학회:학술대회논문집
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    • 대한원격탐사학회 1999년도 Proceedings of International Symposium on Remote Sensing
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    • pp.95-99
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    • 1999
  • We proposed a new retrieval method for aerosol's real part of refractive index, optical thickness, and Angstrom exponent using POLDER's directional reflectance and polarization data. We showed that aerosol's real part of refractive index can be retrieved systematically using multi-directional PR(polarization and reflectance) diagrams in a single infrared band by our algorithm for the first time. We examined the retrieved results, by comparing with the simultaneously measured sky observation data at the study site and we obtained a reasonable agreement between them.

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소득분포 극화의 추정과 검증 (Estimation and Verification for Polarization of Income Distribution in Korea)

  • 유경준
    • KDI Journal of Economic Policy
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    • 제29권3호
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    • pp.1-28
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    • 2007
  • 본고의 분석 결과 지니계수와 양극화지수가 이론적으로는 상이하나, 실증적으로는, 상관관계를 통해서 볼 때, 다른 지수라 보기 어렵다는 점이 확인되었다. 또한 DER지수의 추정을 통해 한국소득분포의 극화를 추정한 결과도 외환위기 전후로 소득분포의 극화가 지니계수로 측정되는 소득불평등도보다 심화되었다고 여길 수 없음이 확인되었다.

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임가의 소득불평등과 양극화 추이 (Trends on Income Inequality and Bi-polarization for Forest Household)

  • 김의경;정병헌;김동현
    • 한국산림과학회지
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    • 제106권4호
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    • pp.497-508
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    • 2017
  • 이 연구는 임가의 소득불평등과 양극화의 추이를 살펴보기 위한 목적으로 수행되었다. 이를 위해 소득불평등도는 지니계수와 엣킨슨 지수를 활용하여 분석하였으며 양극화는 DER 지수를 이용하였다. 그리고 이들 지수들은 임가소득과 함께 이것을 구성하는 하부소득인 임업소득, 겸업소득 그리고 이전소득으로 세분화하여 살펴보았다. 분석결과, 임가의 소득불평등도는 우리나라 전체 가구의 소득불평등도보다 상대적으로 높은 수준으로 분석되었다. 그리고 이전소득을 제외한 임가소득, 임업소득, 겸업소득에 있어서 소득 불평등은 심화되는 것으로 나타났다. 이러한 추세는 양극화에서도 볼 수 있다.

Electrochemical Noise Analysis on the General Corrosion of Mild steel in Hydrochloric Acid Solution

  • Seo, Do-Soo;Lee, Kwang-Hak;Kim, Heung-Sik
    • Corrosion Science and Technology
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    • 제7권6호
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    • pp.319-323
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    • 2008
  • The polarization resistance of mild steel in 0.5M hydrochloric acid has been evaluated by using impedance (Z) and linear polarization (LPR) techniques and compared to the noise resistance obtained from electrochemical noise data. The degree of localization of this general corrosion has also been discussed by evaluating localization index and power spectral density. Polarization resistance obtained by LPR technique ($28\Omega$) was higher than that obtained by impedance technique ($15\Omega$). Noise resistance ($11\Omega$) was much lower than polarization resistance measured by both of above techniques. Higher polarization resistance obtained by LPR technique is generally caused by passivation effect in the presence of scales or deposits which can introduce an increased resistance as can low conductivity electrolytes. The reason why noise resistance is lower than polarization resistance is the effect of background noise detected by using three platinum electrodes cell in 0.5M hydrochloric acid. Slope($-\beta$) of power spectral density (PSD) obtained from analysis of noise data ($-\beta$ = 3.3) was much higher than 2 which indicates mild steel corroded uniformly. Localization index (LI) calculated from statistical analysis (LI=0.08) is much lower than 1 which indicates that mild steel did not corroded locally. However, LI value is still higher than $1x10^{-3}$ and this indicates that mild steel corroded locally in microscopic point of view.

Polarization Insensitive Fiber-Optic Refractometer based on a Side-polished Fiber Coupler with a Thick Glass Waveguide

  • Sohn, Kyung-Rak;Song, Jae-Won;Kim, Hyung-Pyo
    • Journal of the Optical Society of Korea
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    • 제6권3호
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    • pp.117-120
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    • 2002
  • Side-polished single-mode fiber covered with a thick planar-glass-waveguide is studied as a polarization-insensitive fiber-optic refractometer The properties of the device are very sensitive to the index variation of an upper cladding on top of the overlay waveguide. We investigate the spectral response, the polarization properties, and the relationship between the shift in coupling wavelength and the index variation of an upper cladding layer Index resolutions of the order of 10-4 have been achieved.

Research on the Polarization Effects of the Shandong Processing Trade and Strategy to Coordinate Its Development

  • Xiao, Dan Dan
    • Asian Journal of Business Environment
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    • 제3권2호
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    • pp.17-22
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    • 2013
  • Purpose - This dissertation is based on previous research, and analyzes processing trade, which constitutes a major section of foreign trade in Shandong Province. Research design, data, and methodology - The study uses the survey data on polarization, which is a vital index reflecting the unbalanced growth of regional economic development. The article introduces the processing trade polarization index, and the processing trade polarization fluctuation rate, to predict the geographical polarization posture and development trends in Shandong Province. Results -The development of processing trade in Shandong Province shows the level of gradient from east to west. The first-line growth pole has been formed and developed, and the initial formation of the diffusion mechanism has taken place. However, coordination problems in accompanying regional development have become increasingly prominent. Conclusions - This study focuses on the development of processing trade strategy and suggests overall coordination of development objectives, using non-balanced development goals. According to regional characteristics and development objectives of the processing trade in Shandong Province, the region around the city is divided into innovation diffusion region, enhanced growth areas, areas expected to undertake development, and areas to upgrade in four levels, given the different policy proposals.

OPTICAL PROPERTIES OF ASIAN DUST ESTIMATED FROM GROUND BASED POLARIZATION MEASUREMENTS

  • KUSAKA Takashi;NISHISAKA Tomoya
    • 대한원격탐사학회:학술대회논문집
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    • 대한원격탐사학회 2005년도 Proceedings of ISRS 2005
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    • pp.385-387
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    • 2005
  • Polarimetric measurements of the sky radiation by the PSR-I000, which is the multi-spectral polarimeter developed by the Opt Research Corporation and has the same wavelength regions (443nm, 490nm, 565nm, 670nm, 765nm and 865nm) as the ADEOSII/POLDER sensor, have been carried out at the ground station in Kanazawa city, Japan from March to May. First of all, the wavelength dependency of degrees of polarization is examined and it is shown that degrees of polarization measured under the hazy dust cloud are lower than those measured in the clear sky and decrease as the wavelength increases. Next, a new method for estimating optical properties, such as the optical thickness, the number size distribution and the refractive index, of the Asian dust and the ground reflectance from degrees of polarization measured by PSR-I000 is described. Finally, this method is applied to polarization data acquired on April 15,2002. As a result, it is shown that our estimation algorithm provides a good result.

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