• 제목/요약/키워드: and photometry

검색결과 500건 처리시간 0.021초

Photometry of the long-period eclipsing polar V1309 Ori

  • Kim, Y.;K. Reinsch;Y. B. Jeon
    • 한국우주과학회:학술대회논문집(한국우주과학회보)
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    • 한국우주과학회 2003년도 한국우주과학회보 제12권2호
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    • pp.24-24
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    • 2003
  • We present preliminary results about the quasi-simultaneous near-infrared light curves of the long-period eclipsing polar V1309 Ori in the J, H, K', and K bands with almost complete orbital phase coverage using the CFHT-IR camera. The optical light curve in the V and R bands, obtained by 1.8m Telescope at BOAO, will be also presented. The shape and the amplitude of the orbital light curve change significantly from optical to near-infrared wavelengths.

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사진 측정에 의한 옷감의 질감 모델링 및 사실적 렌더링 (A realistic modeling and rendering of cloth textures by photometry)

  • 김민수;김명준
    • 한국정보과학회:학술대회논문집
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    • 한국정보과학회 2005년도 가을 학술발표논문집 Vol.32 No.2 (1)
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    • pp.685-687
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    • 2005
  • 본 논문에서는 옷감의 결이 보이는 정도의 자세함을 가지는 옷감의 표면 질감 모델을 제안한다. 촬영한 옷감 이미지에서 "Shape from Shading" 기법을 이용하여 표면의 노말맵과 반사 계수 맵을 추출하고, 이 맵을 짜깁기(tiling)하였을 때 연결자리(Seam)가 보이는 것을 방지하기 위하여 주파수 성분 분석에 의해 맵의 오류 성분을 제거한다. 이 방법을 통하여 다양한 종류의 옷감을 짧은 시간 안에 렌더링 할 수 있게 된다.

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흑연로 원자흡광분석법에 의한 생약중의 Germanium 함량에 관한 연구 (Determination of Germanium in Botanical Drugs by Flameless Atomic Absorption Spectrophotometry)

  • 백남호;이왕규;박만기;박정일
    • 약학회지
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    • 제23권3_4호
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    • pp.141-146
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    • 1979
  • Germanium in various botanical drugs was determined by flameless atomic absorption spectro-photometry with a graphite tube atomizer. The amounts of Ge in Zingiberis Rhizoma and Angelicae Radix were $169{\mu}g/g$ and $146{\mu}g/g$, respectively. The amounts of Ge in some other drugs ranged from $70{\mu}g/g$ to $130{\mu}g/g$. There is much more Ge in botanical drugs than in foods.

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OV 별의 유효온도 (EFFECTIVE TEMPERATURE OF OV STARS)

  • 조순화;윤홍식
    • 천문학회지
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    • 제10권1호
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    • pp.3-12
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    • 1977
  • $Str\ddot{o}mgren$-system colors for 23 OV stars compiled by Crawford have been compared with colors calculated by Mihalas from non-LTE model atmospheres. In this way, effective temperatures of these stars have been determined and plotted against spectral type, $c_1$ (u-b), (b-y), (U-B), and (B-V). Within the accuracy of the observations, effective temperatures derived from the photometry for these 23 main-sequence stars are found to be in good agreement with Contiis spectroscopical temperatures.

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TRIAXIAL BULGES IN BARRED GALAXIES

  • Ann, Hong-Bae
    • 천문학회지
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    • 제28권2호
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    • pp.209-221
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    • 1995
  • We have examined bulge morphology of 104 bright barred galaxies, using V-band surface photometry based on the Kiso Schmidt plates. By measuring the bulge ellipticity and bulge-disk misalignment, we have classified bulges into four morphological types: sphere, oblate spheroid, triaxial ellipsoid, and pseudo triaxial ellipsoid. About half of the observed galaxies are found to have triaxial bulges with mean ellipticity of 0.24. They are distributed uniformly along the Hubble sequence.

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NEAR-IR GIANT BRANCH SLOPE-METALLICITY RELATION OF OPEN CLUSTERS

  • KYEONG JAE-MANN;BYUN YONG-IK
    • 천문학회지
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    • 제34권3호
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    • pp.137-141
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    • 2001
  • We derive a new relationship between the giant branch slope as measured in the color-magnitude diagram (K, J - K) and [Fe/H] metallicity for old open clusters. Previously such relationships have been derived for globular clusters, while similar tendency has been expected for open clusters. New derived correlation, [Fe/H]=-17.2($\pm$0.23)GB slope - 1.95($\pm$0.02), is based on a collection of data for 10 old open clusters. Most clusters behave as expected from the theoretical predictions.

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CCD PHOTOMETRY OF THE GLOBULAR CLUSTER NGC 4372

  • Yim, Hong-Suh;Lee, Young-Wook;Chum, Mun-Suk
    • Journal of Astronomy and Space Sciences
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    • 제11권2호
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    • pp.147-153
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    • 1994
  • We present a deep(B, V) color-magnitude diagram (CMD) of the Galactic globular cluster NGC 4372. According to the recent inside-out picture of Galaxy formation, this cluster is predicted to be one of the oldest globulat clusters in the Galaxy. Our CMD shows a well defined main-sequence extending ∼ 2 magnitudes below the trunoff. Despite the uncertainty that stems from the small sample size of bright stars, comparison with the Revised Yale Isochrones suggests that this cluster may indeed be one of the oldest (∼16.6 Gyrs) globular clusters in our Galaxy.

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