• Bulletin of the Korean Space Science Society
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• 2006.04a
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• pp.48-48
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• 2006

• Journal of Astronomy and Space Sciences
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• v.11 no.2
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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.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2002.11c
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• pp.2207-2210
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• 2002

무선 전자상거래(M-Commerce) 전자지불 방식의 하나인 전자화폐는 실물 화폐와 유사한 성질을 만족해야 한다. 본 논문에서는 지불된 전자화폐가 악용되었을 때 신뢰센터가 필요로 하는 경우 전자화폐 사용자와 브로커를 연관지을 수 있고 이산대수문제에 기반 한 메타-메시지 복원과 은닉 RSA서명 기법을 이용하여 이미 지불된 금액을 재생성 할 수 있는 알고리즘을 제안한다.

• Proceedings of the Materials Research Society of Korea Conference
• /
• 2007.11a
• /
• pp.137.1-137.1
• /
• 2007

• Proceedings of the Materials Research Society of Korea Conference
• /
• 2007.11a
• /
• pp.137.2-137.2
• /
• 2007

• 대한생식의학회:학술대회논문집
• /
• 2004.11a
• /
• pp.98-98
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• 2004

• 제어로봇시스템학회:학술대회논문집
• /
• 2002.10a
• /
• pp.63.4-63
• /
• 2002

$\textbullet$ Closed System Identification for inherently unstable systems $\textbullet$ Application of Observer/controller Identification (OCID) algorithm to those systems $\textbullet$ An open-loop system model with corresponding controller and observer gains are identified using OCID $\textbullet$ Experimental example of the OCID algorithm for an inverted pendulum system operating in closed-loop $\textbullet$ Modal analysis and time response to the added distrubance are presented to evaluate the performance of the OCID algorithm.

• The Bulletin of The Korean Astronomical Society
• /
• v.34 no.2
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• pp.73.1-73.1
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• 2009

• The Bulletin of The Korean Astronomical Society
• /
• v.34 no.2
• /
• pp.72.1-72.1
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• 2009

• Journal of The Korean Astronomical Society
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• v.16 no.1
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• pp.1-5
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• 1983

Four HII regions of the Sd galaxy NGC 7793 were observed using AAT/IPCS. From these spectra we determined abundances of the elements using observed emission lines and electron temperatures. The calculated abundances show that this galaxy does not show any significant radial abundance gradient. The mean oxygen abundance is very much like the Orion nebulae and the nitrogen abundance is similar to the late type barred spiral galaxy NGC 1313.