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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Publications of The Korean Astronomical Society
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Journal DOI :
The Korean Astronomical Society
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Volume & Issues
Volume 21, Issue 2 - Dec 2006
Volume 21, Issue 1 - Jun 2006
Selecting the target year
INTERNATIONAL COOPERATION OF THE COSMIC INFRARED BACKGROUND EXPERIMENT
Lee, D.H. ; Nam, U.W. ; Lee, S. ; Jin, H. ; Yuk, I.S. ; Kim, K.H. ; Pak, S. ;
Publications of The Korean Astronomical Society, volume 21, issue 2, 2006, Pages 21~26
DOI : 10.5303/PKAS.2006.21.2.021
A Korean team (Korea Astronomy and Space Science Institute, Korea Basic Science Institute, and Kyung Hee University) takes part in an international cooperation project called CIBER (Cosmic Infrared Background ExpeRiment), which has begun with Jet Propulsion Laboratory (JPL) in USA and Institute of Space and Astronautical Science (ISAS) in Japan. CIBER is a rocket-borne instrument, of which the scientific goal is to measure the cosmic near-infrared extra-galactic background to search for signatures of primordial galaxy formation. CIBER consists of a wide-field two-color camera, a low-resolution absolute spectrometer, and a high-resolution narrow-band imaging spectrometer. The Korean team is in charge of the ground support electronics and manufacturing of optical parts of the narrow-band spectrometer, which will provide excellent opportunities for science and technology to Korean infrared groups.
FAR-INFRARED CHARACTERISTICS OF GIANT MOLECULAR CLOUDS
Jung, Jae-Hoon ; Kim, Hyun-Goo ; Kim, Bong-Gyu ;
Publications of The Korean Astronomical Society, volume 21, issue 2, 2006, Pages 27~33
DOI : 10.5303/PKAS.2006.21.2.027
Infrared color-color diagram of 10 giant molecular clouds are examined to explore the dust property from the COBE Diffuse Infrared Background Experiment of the 100, 140, and
emission. Four of them, Taurus, Mon OB1, Gem OB1, and Chameleon, show the anti-correlation in
plot and the horizontal distribution in
plot, which disagree with those of theoretical calculation. These could be explained by the depletion of
and the excess of
emission, though no existing dust model could support them. Mean color temperature of the anti-correlation region appears to be lower than that of the linear region, whose temperatures are 15.3, 17.0 K, respectively. And the linear region shows large dispersion in the plot of intensity relation. Both imply that a star formation would be more active, but not homogeneous, in the linear region compared to the anti-correlation region.
HIGH RESOLUTION SPECTRUM OF SYMBIOTIC STAR AG PEGASI
Yoo, Kye-Hwa ;
Publications of The Korean Astronomical Society, volume 21, issue 2, 2006, Pages 35~42
DOI : 10.5303/PKAS.2006.21.2.035
We report a high resolution spectrum of AG Pegasi observed at Bohyunsan Optical Astronomy Observatory (BOAO) on October 2, 2004. Some of permitted emission lines, for example H I, He I, He II, Fe II and Ti II were observed in the spectrum of AG Pegasi in 2004. Lines presented in the longer wavelength region than
are identified. And radial velocities for each element are measured. Then we carefully discuss the geometrical feature of AG Pegasi in October 2004.
FABRICATION AND ALIGNMENT OF PARTS OF THE KASINICS OFFNER SYSTEM
Mok, Seung-Won ; Lee, Sung-Ho ; Yuk, In-Soo ; Park, Young-Sik ; Jin, Ho ; Han, Jeong-Yeo ; Moon, Bong-Kon ; Cha, Sang-Mok ; Kim, Geon-Hee ; Im, Myung-Shin ;
Publications of The Korean Astronomical Society, volume 21, issue 2, 2006, Pages 43~49
DOI : 10.5303/PKAS.2006.21.2.043
The KASINICS (KASI Near Infrared Camera System) is a ground-based Near-Infrared (NIR) imaging instrument developed by the Korea Astronomy and Space Science Institute (KASI). In this paper, we report the test results of the KASINICS camera optics system which is comprised of a 1-1 Offner relay. We measure that the surface RMS fluctuations of the Offner mirrors are at the level of
of the target wavelengths, showing that the mirrors are sufficiently smooth for NIR observations. The alignment of the Offner optics system has been checked too. Our ray-tracing simulations find that the image quality should not degrade more than the pixel size of the KASINICS (
), if a de-centering or a tilt of the Offner mirrors are within 5mm, or
. Our measurement shows that the de-centering or the tilt of the Offner mirrors are less than 1 mm or
, assuring that the KASINICS image quality are not affected by the alignment errors. We have also measured that the optics resolution is
and it does not degrade more than 10% over the detector surface area of 14.3 mm
14.3mm. Overall, we conclude that the KASINICS optics system satisfies the design requirements for NIR imaging observations.
DEVELOPMENT OF KASI SOLAR IMAGING SPECTROGRAPH
Kim, Y.H. ; Moon, Y.J. ; Cho, K.S. ; Park, Y.D. ; Choi, S.H. ; Jang, B.H. ; Kim, S. ;
Publications of The Korean Astronomical Society, volume 21, issue 2, 2006, Pages 51~59
DOI : 10.5303/PKAS.2006.21.2.051
We have successfully developed the KASI (Korea Astronomy and Space Science Institute) Solar Imaging Spectrograph (KSIS), which has been originally upgraded from the KASI solar spectrograph that was able to record solar spectra for a given slit region and to inspect the response function of narrow band filters. A prototype KSIS was developed in 2004 by using a scanning mirror in front of the spectrograph slit and a SBIG ST-8XE CCD camera. Its main disadvantage is that it took a long time (about 13 minutes) to scan a whole active region. In this work, we have upgraded the KSIS by installing a much faster Dalsa 1M15 CCD camera, which gives a data acquisition time of about 2.5 minutes. The software for KSIS was also improved for the new CCD camera on the basis of component-based development method. We have successfully made a test observation for a simple and small active region (AR10910) using the improved KSIS system. Our observations show that H-alpha images for several wavelengths have typical features in a sunspot as well as a H-alpha centerline image is quite similar to a BBSO H-alpha image, demonstrating the capability of the KSIS system.
PERFORMANCE TEST OF THE PROTO-MODEL OF SPACE INFRARED CRYOGENIC SYSTEM
Lee, D.H. ; Yang, H.S. ; Nam, U.W. ; Lee, S. ; Jin, H. ; Kim, D.L. ; Pak, S. ; Kim, B.H. ; Park, S.J. ;
Publications of The Korean Astronomical Society, volume 21, issue 2, 2006, Pages 61~66
DOI : 10.5303/PKAS.2006.21.2.061
We have tested the performance of the Proto-model of Space Infrared Cryogenic System (PSICS), which is a small infrared camera, developed by Korea Astronomy and Space science Institute (KASI), Korea Basic Science Institute (KBSI), Korea Institute of Machinery and Materials (KIMM), and i3system co., as a cooperation project. The purpose of PSICS is to ensure a technology of small infrared cryogenic system for future development of space infrared (IR) cameras. PSICS consists of cryogenic part, IR sensor and electronics part, and optical part. The performance test of each part and the integrated system has been completed successfully. PSICS will be used as a guiding camera for ground-based IR telescopes and a test system for developing a space-borne instrument.
DEVELOPMENT OF THE READOUT CONTROLLER FOR INFRARED ARRAY
Cho, Seoung-Hyun ; Jin, Ho ; Nam, Uk-Won ; Cha, Sang-Mok ; Lee, Sung-Ho ; Yuk, In-Soo ; Park, Young-Sik ; Pak, Soo-Jong ; Han, Won-Yong ; Kim, Sung-Soo ;
Publications of The Korean Astronomical Society, volume 21, issue 2, 2006, Pages 67~74
DOI : 10.5303/PKAS.2006.21.2.067
We have developed a control electronics system for an infrared detector array of KASINICS (KASI Near Infrared Camera System), which is a new ground-based instrument of the Korea Astronomy and Space science Institute (KASI). Equipped with a
InSb array (ALADDIN III Quadrant, manufactured by Raytheon) sensitive from 1 to
, KASINICS will be used at J, H, Ks, and L-bands. The controller consists of DSP(Digital Signal Processor), Bias, Clock, and Video boards which are installed on a single VME-bus backplane. TMS320C6713DSP, FPGA(Field Programmable Gate Array), and 384-MB SDRAM(Synchronous Dynamic Random Access Memory) are included in the DSP board. DSP board manages entire electronics system, generates digital clock patterns and communicates with a PC using USB 2.0 interface. The clock patterns are downloaded from a PC and stored on the FPGA. UART is used for the communication with peripherals. Video board has 4 channel ADC which converts video signal into 16-bit digital numbers. Two video boards are installed on the controller for ALADDIN array. The Bias board provides 16 dc bias voltages and the Clock board has 15 clock channels. We have also coded a DSP firmware and a test version of control software in C-language. The controller is flexible enough to operate a wide range of IR array and CCD. Operational tests of the controller have been successfully finished using a test ROIC (Read-Out Integrated Circuit).
DESIGN OF THE HIGH SPEED INSTRUMENT ROTATOR FOR KHU ARTIFICIAL SPACE OBJECTS MONITORING SYSTEM
Min, S.W. ; Kim, S.J. ; Jang, M. ; Mun, B.S. ; Seol, K.H. ;
Publications of The Korean Astronomical Society, volume 21, issue 2, 2006, Pages 75~79
DOI : 10.5303/PKAS.2006.21.2.075
An alt-azimuth type mount system, developed at the Space Science and Technology Laboratory, Kyung Hee University, has been found to experience some difficulties in monitoring of the artificial space objects. Since the telescope installed on the alt-azimuth mount does not rotate on the same axis as the earth does, this mount system needs an instrument rotator to correct the field rotation. Although there are some commercial instrument rotators already in the market, those are not suitable for our system due to their low interchangeability. In this study, we have designed a new high speed instrument rotator and calculated the deformation of new designed system using structural analyses.
DEVELOPMENT OF THE SOFTWARE FOR 30INCH TELESCOPE CONTROL SYSTEM AT KHAO
Mun, B.S. ; Kim, S.J. ; Jang, M. ; Min, S.W. ; Seol, K.H. ; Moon, K.S. ;
Publications of The Korean Astronomical Society, volume 21, issue 2, 2006, Pages 81~86
DOI : 10.5303/PKAS.2006.21.2.081
Even though 30inch optical telescope at Kyung Hee Astronomy Observatory has been used to produce a series of scientific achievements since its first light in 1992, numerous difficulties in operating of the telescope have hindered the precise observations needed for further researches. Since the currently used PC-TCS(Personal Computer based Telescope Control System) software based on ISA-bus type is outdated, it doesn`t have a user friendly interface and make it impossible to scale. Also accumulated errors which are generated by discordance from input and output signals into a motion controller required new control system. Thus we have improved the telescope control system by updating software and modifying mechanical parts. We applied a new BLDC(brushless DC) servo motor system to the mechanical parts of the telescope and developed a control software using Visual Basic6.0. As a result, we could achieve a high accuracy in controlling of the telescope and use the user friendly GUI(Graphic User Interface).
DETECTOR SIMULATIONS FOR THE COREA PROJECT
Lee, Sung-Won ; Kang, Hye-Sung ;
Publications of The Korean Astronomical Society, volume 21, issue 2, 2006, Pages 87~94
DOI : 10.5303/PKAS.2006.21.2.087
The COREA (COsmic ray Research and Education Array in Korea) project aims to build a ground array of particle detectors distributed over Korean Peninsular, through collaborations of high school students, educators, and university researchers, in order to study the origin of ultra high energy cosmic rays. COREA array will consist of about 2000 detector stations covering several hundreds of
area at its final configuration and detect electrons and muons in extensive air-showers triggered by high energy particles. During the intial phase COREA array will start with a small number of detector stations in Seoul area schools. In this paper, we have studied by Monte Carlo simulations how to select detector sites for optimal detection efficiency for proton triggered air-showers. We considered several model clusters with up to 30 detector stations and calculated the effective number of air-shower events that can be detected per year for each cluster. The greatest detection efficiency is achieved when the mean distance between detector stations of a cluster is comparable to the effective radius of the air-shower of a given proton energy. We find the detection efficiency of a cluster with randomly selected detector sites is comparable to that of clusters with uniform detector spacing. We also considered a hybrid cluster with 60 detector stations that combines a small cluster with
and a large cluster with
. We suggest that it can be an ideal configuration for the initial phase study of the COREA project, since it can measure the cosmic rays with a wide range energy, i.e.,
, with a reasonable detection rate.
RADIO ASTRONOMICAL DATA PROCESSING USING MARK5B
Oh, Se-Jin ; Yeom, Jae-Hwan ; Roh, Duk-Gyoo ; Chung, Hyun-Soo ; Je, Do-Heung ; Kim, Kwang-Dong ; Kim, Bum-Koog ; Hwang, Cheol-Jun ; Jung, Gu-Young ;
Publications of The Korean Astronomical Society, volume 21, issue 2, 2006, Pages 95~100
DOI : 10.5303/PKAS.2006.21.2.095
In this paper, we describe the radio astronomical data processing system implementation using Mark5B and its development. KASI(Korea Astronomy and Space Science Institute) is constructing the KVN (Korean VLBI Network) until the end of 2007, which is the first VLBI(Very Long Baseline Interferometery) facility in Korea and dedicated for the mm-wave VLBI observation. KVN will adopt the DAS (Data Acquisition System) consisting of digital filter with various function and 1Gsps high-speed sampler to digitize the radio astronomical data for analyzing on the digital filter system. And the analyzed data will be recorded to recorder up to 1Gbps data rates. To test this, we have implemented the system which is able to process 1Gbps data rates and carried out the data recording experiment.
DEVELOPMENT OF AN AUTOMATIC PROCESSING PROGRAM FOR BOES DATA II
Kang, Dong-Ii ; Park, Hong-Suh ; Han, In-Woo ; Valyavin, G. ; Lee, Byeong-Cheol ; Kim, Kang-Min ;
Publications of The Korean Astronomical Society, volume 21, issue 2, 2006, Pages 101~112
DOI : 10.5303/PKAS.2006.21.2.101
We developed a new program for automatic continuum normalization of Echelle spectrographic data. Using this algorithm, we have determined spectral continuum of almost BOES data. The first advantage of this algorithm is that we can save much time for continuum determination and normalization. The second advantage is that the result of this algorithm is very reliable for almost spectral type of spectrum. But this algorithm cannot be applied directly to the spectrum which has very strong and broad emission lines, for example Wolf-Rayet type spectrum. We implanted this algorithm to the program which was developed in the previous study. And we introduced more upgraded BOES data reduction program. This program has more convenient graphical user interface environment, so users can easily reduce BOES data. Lastly, we presented the result of study on line profile variation of magnetic Ap/Bp stars analyzed using this program.
CONSTRUCTION OF KOREAN ASTRONOMICAL JOURNAL DB
Sung, Hyun-Il ; Kim, Soon-Wook ; Yim, In-Sung ; Sang, Jian ;
Publications of The Korean Astronomical Society, volume 21, issue 2, 2006, Pages 113~119
DOI : 10.5303/PKAS.2006.21.2.113
The Korean Astronomical Data Center(KADC) in Korea Astronomy and Space Science Institute(KASI) has developed a database of astronomical journals published by the Korean Astronomical Society and the Korean Space Science Society. It consists of all bibliographic records of the Journal of the Korean Astronomical Society(JKAS), Publication of the Korean Astronomical Society(PKAS), and Journal of Astronomy & Space Sciences(JASS). The KADC provides useful search functions in the search page such as search criterion of bibcode, publication date, author names, title words, or abstract words. The journal name is one of the search criterion in which more than one journal can be designated at the same time. The criterion of author name is provided bilingually: English or Korean. The abstract and full text can be downloaded as PDF files. It is also possible to search papers related to a specific research topic published in Korean astronomical journals, provided by the KADC, which often cannot be found the worldwide, Astrophysics Data System(ADS) services. The KADC will become basic infrastructure for the systematic construction of bibliographic records, and hence, make the society of Korean astronomers more interactive and collaborative.