• Title/Summary/Keyword: Astronomy

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YSTAR Experiments for Optical Transients

  • Chang, Seo-Won;Byun, Yong-Ik;Oh, Se-Heon;Kang, Yong-Woo;Park, Sun-Youp;Han, Won-Yong;Moon, Hong-Kyu;Yim, Hong-Suh
    • The Bulletin of The Korean Astronomical Society
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    • v.31 no.2
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    • pp.35.2-35.2
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    • 2006

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The Mid-infrared View of Red Sequence Galaxies in Abell 2218 with AKARI

  • Ko, Jong-Wan;Im, Myung-Shin;Lee, Hyung-Mok;Lee, Myung-Gyoon;Hopwood, Ros H.;Serjeant, Stephen;Smail, Ian;Hwang, Ho-Seong;Hwang, Na-Rae;Shim, Hyun-Jin;Kim, Seong-Jin;Lee, Jong-Chul;Seo, Hyun-Jong;Goto, Tomotsugu;Hanami, Hitoshi;Matsuhara, Hideo;Takagi, Toshinobu;Wada, Takehiko;Lim, Sung-Soon
    • The Bulletin of The Korean Astronomical Society
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    • v.34 no.1
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    • pp.193-193
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    • 2009

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M101 Supernova

  • Im, Myung-Shin;Pak, Soo-Jong;Park, Won-Kee;Baek, Gi-Seon;Oh, Young-Seok;Kim, Ji-Hoon;Choi, Chang-Su;Hong, Ju-Eun;Jeon, Yi-Seul;Jun, Hyun-Sung;Kim, Do-Hyeong;Kim, Du-Ho;Jang, Min-Sung;Park, Geun-Hong;Yang, Hee-Su;Jeong, Il-Gyo;Lee, Bang-Won;Yang, Hong-Kyu;Sohn, Ju-Bee;Lee, Gwang-Ho;Yoon, Yosep
    • The Bulletin of The Korean Astronomical Society
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    • v.36 no.2
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    • pp.77.2-77.2
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    • 2011

  • We present our follow-up observation of the recently discovered supernova in M101. Being only 6.4 Mpc away from the Earth, the object is a Type-Ia supernova discovered this close in decades. We followed up this event with various observing facilities including on-campus telescopes at Seoul National University, the McDonald observatoy's 2.1m telescope, and UKIRT 4-m telescope. The light curves and the preliminary analysis of the multi-wavelength data will be presented, which cover the wavelengths from optical to NIR.

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Current Status and Future Prospects of Korean VLBI Network (KVN)

  • Jung, Taehyun;Sohn, Bong Won;So, Byunghwa;Oh, Chungsik;Je, Do-Heung;Byun, Do-Young;Jung, Dong-Kyu;Roh, Duk Gyoo;Lee, Euikyum;Kim, Hyo Ryoung;Kim, Hyun-Goo;Byun, Hyungkyu;Chung, Hyunsoo;Yim, In Sung;Kim, Jae-Young;Kim, Jaeheon;Yeom, Jaehwan;Shin, Jaesik;Park, Jeong-Je;Kim, Jeong-Sook;Hwang, Jungwook;Wajima, Kiyoaki;Song, Min-Gyu;Chung, Moon-Hee;Sakai, Nobuyuki;Lee, Sang-Hyun;Lee, Sang-Sung;Oh, Sej-Jin;Wi, Seog Oh;Kim, Seungrae;Kim, Soon-Wook;Lee, Sung-Mo;Kang, Yong-Woo;Minh, Young Chol;Kim, Young-Sik;Yun, Youngjoo
    • The Bulletin of The Korean Astronomical Society
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    • v.46 no.1
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    • pp.60.3-61
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    • 2021

  • The Korean VLBI Network (KVN) consists of three 21m radio telescopes installed in Seoul, Ulsan, and Jeju Island with the world's first 4-channel receiver that can observe four different frequencies (e.g., 22, 43, 86, 129 GHz) simultaneously. This receiving system of KVN is particularly effective in millimeter-wavelength VLBI (mm-VLBI) observations by compensating fast atmospheric fluctuations effectively. This technology is now being enhanced with a compact triple-band receiver, becoming the world standard for a mm-VLBI system. In 2020, KVN supported 54 observing programs (KVN: 28, EAVN: 26) including the 2nd KVN Key Science Program (KSP) which supports 8Gbps data recording rate and the East Asian VLBI Network (EAVN) programs. KVN also participated in the European VLBI Network (EVN) and GMVA (Global Millimeter VLBI Array) sessions regularly. Here, we report current status and future propsects of KVN.

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Design of the Control and Monitoring Architecture for the KVN 4 Channel Receiver System using Profibus

  • Song, Min-Gyu;Byun, Do-Young;Je, Do-Heung;Kang, Yong-Woo;Wi, Seog-Oh;Lee, Sung-Mo;Lee, Jung-Won;Chung, Moon-Hee;Kim, Seung-Rae;Jung, Tae-Hyun;Lee, Eui-Kyum;Lee, Sang-Hyun;Hwang, Jung-Wook
    • The Bulletin of The Korean Astronomical Society
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    • v.43 no.2
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    • pp.57.3-57.3
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    • 2018

  • KVN 수신기는 22/43/86/129GHz 주파수 대역의 우주전파를 관측할 수 있는 4채널 동시 관측 시스템의 핵심으로 다수의 제어 및 모니터 항목이 존재한다. 대표적인 예로 Synthesizer, Pcal, LO, Vacuum, Cryogenic Temperature 등이 있으며 이와 관련된 여러 인스트루먼트가 21m 전파망원경의 하부단에 위치한 수신기실 내에 분산 배치되어 있다. 이에 대한 효율적인 제어를 위해서는 사용자 컴퓨터 관점에서 두 가지 조건이 충족되어야 한다. 첫째, 물리적으로 분산된 인스트루먼트에 대한 접근 및 변경이 용이해야 하고, 둘째는 단일 인터페이스 상에서 다양한 인스트루먼트를 하나로 통합하는 확장성이 보장되어야 한다. 이러한 요건을 고려하여 KVN은 산업 분야에서 널리 쓰이고 있는 프로피버스를 수신기 시스템의 제어를 위한 기반 인터페이스로 활용 중에 있고, 추가 기능 요구에 효율적으로 대처하고 있다. 본 발표에서는 먼저 KVN 수신기 시스템을 구성하는 인스트루먼트에 대해 살펴보고자 한다. 그리고 이를 효율적으로 제어하기 위한 기반 인터페이스로서 프로피버스 구축 및 활용 현황에 대해 논하고자 한다.

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