• 제목/요약/키워드: 1996~2010

검색결과 218건 처리시간 0.027초

Comparison of Empirical Magnetopause Location Models with Geosynchronous Satellite Data

  • Park, Eunsu;Moon, Yong-Jae
    • 천문학회보
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    • 제41권1호
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    • pp.44.3-45
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    • 2016

  • In this study, we identify 307 the geosynchronous magnetopause crossing (GMC) using geosynchronous satellite observation data from 1996 to 2010 as well as make an observational test of magnetopause location models using the identified events. For this, we consider three models: Petrinec and Russell (1996), Shue et al. (1998), and Lin et al. (2010). To evaluate the models, we estimate a Probability of Detection (PoD) and a Critical Success Index (CSI) as a function of year. To examine the effect of solar cycle phase, we consider three different time periods: (1) ascending phase (1996-1999), (2) maximum phase (2000-2002), and (3) descending phase (2003-2008). Major results from this study are as follows. First, the PoD values of all models range from 0.6 to 1.0 for the most of years. Second, the PoD values of Lin et al. (2010) are noticeably higher than those of the other models. Third, the CSI values of all models range from 0.3 to 0.6 and those of Shue et al. (1998) are slightly higher than those of the other models. Fourth, the predicted magnetopause radius based on Lin et al.(2010) well match the observed one within one earth radius, while that on Shue et al. (1998) overestimate the observed one by about 2 earth radii. Fifth, the PoD and CSI values of all the models are better for the solar maximum phase than those for the other phases, implying that the models are more optimized for the phase.

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초고속망번호체계 검토

  • 이준호
    • 정보화사회
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    • 통권106호
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    • pp.12-13
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    • 1996

  • 초고속 정보통신망은 정부에서 투자, 2010년까지 정부기관 및 연구소, 공공기관에 정보서비스를 제공하려는 것으로 2010년까지 약 3만개의 기관이 가입할 전망이다. 궁극적으로 초고속 정보통신망(국가망)이 초고속 공중망과 연결돼서 일반 국민들이 정부가 보유하고 있는 정보를 접속할 수 있도록 구축할 계획이다.

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