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박병곤,장정균,성현철,장비호,김강민,한인우,Park, B.G.,Jang, J.G.,Seong, H.C.,Jang, B.H.,Kim, K.M.,Han, I. 한국천문학회 2003 天文學論叢 Vol.18 No.1
A CCD camera for the BOES (Bohyunsan Observatory Echelle Spectrograph) has been developed. The camera consists of a 2048 ${\times}$ 4096 format CCD, a SDSU Gen-I CCD controller, and a continuous flow cryostat (CFC) designed by the ESO. In order to control the CCD under SDSU Gen-I controller, the voltage level of all the biases and clocks were lowered by -6V. The CFC showed cooling time of about 10 hour, after which the chip temperature settled down with variation less than ${\pm}1^{\circ}C$. The final chip temperature is around -105$^{\circ}C$ with the setting value for the CFC as -170$^{\circ}C$.
박병곤,성현철,장정균,장비호,이병철,박윤호,김강민,한인우,Park, B.G.,Seong, H.C.,Jang, J.G.,Jang, B.H.,Lee, B.C.,Park, Y.H.,Kim, K.M.,Han, I. 한국천문학회 2003 天文學論叢 Vol.18 No.1
The characteristics of the BOES (Bohyunsan Observatory Echelle Spectrograph) CCD camera is presented. In order to get optimum gain and readout noise of the CCD, we examine the variation of the gain and readout noise by changing the value of output drain voltage of the CCD and measuring the gain using transfer curve, which is defined as the plot of variance versus mean exposure level of a homogeneous light onto the CCD surface. The gain and readout noises are optimised to be 0.5e$^-$/ADU and 3e$^-$, which is good for highest signal-to-noise ratio and contrast for the low light level characteristics of the BOES. We also measure the dark count of the CCD by getting five dark images with 3600 seconds exposure time. The mean dark count from median stacked dark images is essentially zero. A table of positions of defected pixels is also presented.
안상현,박병곤,김영수,천무영,김호일,성현일,이동욱,김상철,Ahn, S.H.,Park, B.G.,Kim, Y.S.,Chun, M.Y.,Kim, H.I.,Sung, H.I.,Lee, D.W.,Kim, S.C. 한국천문학회 2008 天文學論叢 Vol.23 No.2
Productivity of the Giant Magellan Telescope is estimated based on the annual number of papers produced by the currently operating large telescopes such as the telescope at the ESO La Silla observatory, CFHT, AAT, the Magellan telescopes, ESO VLT, Japanese Subaru, the Gemini telescopes, and the Keck telescopes. We find that the amount of papers produced by a large telescope is roughly proportional to the diameter of its primary mirror. With this fact, we estimate the SCI-paper productivity of the Giant Magellan Telescope by extrapolating the productivity of the above-mentioned large telescopes. Moreover, according to the paper written in 2001 by Benn and Sanchez, the amount of highly-cited papers produced by a large telescope is roughly proportional to the light-gathering power of the telescope or the square of the diameter. Hence, we survey the productivity of Nature-class papers of the large telescopes and extrapolate the relationship to estimate the productivity of the Nature-class papers by using the Giant Magellan telescope of a filled aperture 21.4 meters in diameter. We expect that Korean astronomers will be able to produce annually 60 SCI-class papers and 20 Nature-class papers with high scientific impact by using the telescope-time corresponding to the 10% share of the Giant Magellan Telescope.
김동진,이충욱,김승리,박병곤,Kim, D.J.,Lee, C.U.,Kim, S.L.,Park, B.G. 한국천문학회 2011 天文學論叢 Vol.26 No.1
We constructed a photometric database system which is optimally designed for microlensing events from KMTNet (Korea Microlensing Telescope Network) observation. We developed a framework software for the convenience of archiving, uploading, searching, and downloading of processed photometric data. From various tests for optimal data archiving engines, we found that the MyISAM storage engine shows the best performance. For the high performance of database system, data types of each field are carefully suggested from various combinations of tests especially to correct round-off errors. The developed framework provides the convenience of access to the database server using query forms via web pages, and displays the light curve of selected target for a quick view.
KMTNet 자료처리 시스템 설계와 측광데이터베이스 구축
김동진,이충욱,김승리,박병곤,이재우,Kim, D.J.,Lee, C.U.,Kim, S.L.,Park, B.G.,Lee, J.W. 한국천문학회 2009 天文學論叢 Vol.24 No.1
We have designed data processing server system to include data archiving, photometric processing and light curve analysis for KMTNet (Korea Microlensing Telescope Network). Outputs of each process are reported to the main photometric database, which manages the whole processing steps and archives the photometric results. The database is developed using ORACLE 11g Release 2 engine. It allows to select objects applying any set of criteria such as RA/DEC coordinate and Star ID, etc. We tested the performance of the database using the OGLE photometric data. The searching time for querying 70,000,000 records was under 1 second. The database is fully accessed using query forms via web page.
김동진,이충욱,김승리,박병곤,Kim, D.J.,Lee, C.U.,Kim, S.L.,Park, B.G. 한국천문학회 2013 天文學論叢 Vol.28 No.1
Real-time data reduction pipeline for the Korea Microlensing Telescope Network (KMTNet) was developed by Korea Astronomy and Space Science Institute (KASI). The main goal of the data reduction pipeline is to find variable objects and to record their light variation from the large amount of observation data of about 200 GB per night per site. To achieve the goal we adopt three strategic implementations: precision pointing of telescope using the cross correlation correction for target fields, realtime data transferring using kernel-level file handling and high speed network, and segment data processing architecture using the Sun-Grid engine. We tested performance of the pipeline using simulated data which represent the similar circumstance to CTIO (Cerro Tololo Inter-American Observatory), and we have found that it takes about eight hours for whole processing of one-night data. Therefore we conclude that the pipeline works without problem in real-time if the network speed is high enough, e.g., as high as in CTIO.