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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Astronomy and Space Sciences
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The Korean Space Science Society
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Volume & Issues
Volume 23, Issue 4 - Dec 2006
Volume 23, Issue 3 - Sep 2006
Volume 23, Issue 2 - Jun 2006
Volume 23, Issue 1 - Mar 2006
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ASPHERICAL DUST ENVELOPES AROUND OXYGEN-RICH AGB STARS
Suh, Kyung-Won ;
Journal of Astronomy and Space Sciences, volume 23, issue 4, 2006, Pages 303~310
DOI : 10.5140/JASS.2006.23.4.303
We model the aspherical dust envelopes around O-rich AGB stars. We perform the radiative transfer model calculations for axisymmetric dust distributions. We simulate what could be observed from the aspherical dust envelopes around O-rich AGB stars by presenting the model spectral energy distributions and images at various wave-lengths for different optical depths and viewing angles. The model results are very different from the ones with spherically symmetric geometry.
PHOTOMETRIC SOLUTIONS OF W UMA TYPE STARS: GSC2576-0319 AND GSC2584-1731
Lee, Chung-Uk ; Lee, Jae-Woo ; Jin, Ho ; Kim, Chun-Hwey ;
Journal of Astronomy and Space Sciences, volume 23, issue 4, 2006, Pages 311~318
DOI : 10.5140/JASS.2006.23.4.311
High-precision photometric observations were performed in BVI bandpasses using Am robotic telescope at Mt. Lemmon Observatory for two binary stars, which are reclassified as W UMa-type systems from ROTSE(Robotic Optical Transient Search Experiment) follow-up observations and show peculiar light variations. In order to analyze W UMa-type eclipsing binaries systematically, the light curve analysis script using 2005 version of Wilson-Devinney binary code is constructed. The orbital inclinations of GSC2S84-1731 and GSC2576-0319 are
from light-curve analysis, respectively. Spot model is applied to explain the asymmetric light curve for GSC2S84-1731 and the spot parameters are derived.
PHOTOMETRIC OBSERVATIONS AND LIGHT CURVE ANALYSIS OF BL ERIDANI
Han, Won-Yong ; Yim, Hong-Suh ; Lee, Chung-Uk ; Youn, Jae-Hyuck ; Yoon, Joh-Na ; Kim, Ho-Il ; Moon, Hong-Kyu ; Byun, Yong-Ik ; Park, Sun-Youp ;
Journal of Astronomy and Space Sciences, volume 23, issue 4, 2006, Pages 319~326
DOI : 10.5140/JASS.2006.23.4.319
We present light curves of a short period binary system BL Eridani. The light curves were observed with VRI filters by a 50cm wide field robotic telescope at Siding Spring Observatory (SSO), equipped with a 2K CCD camera, which was developed by Korea Astronomy and Space Science Institute (KASI), and Yonsei University Observatory(YUO). The photometric observations were made on 6 nights by automatic operation mode and remote observation mode at SSO and KASI in Korea, respectively. We obtained new VRI CCD light curves and new 5 times of minima, and analyzed the light corves with the Wilson & Deviney (1971) binary 2005 version and derived the new photometric solutions. The mass ratio q=0.48 in this study shows different value with earlier investigators. According to the model analysis, it is considered that the BL Eri system is currently undergoing contact stage of the two binary components, rather than near-contact stage.
GAIN DEGRADATION OF KVN 21-M SHAPED CASSEGRAIN ANTENNA DUE TO MISALIGNMENT OF ANTENNA OPTICS
Chung Moon-Hee ; Byun, Do-Young ; Khaikin Vladimir B. ;
Journal of Astronomy and Space Sciences, volume 23, issue 4, 2006, Pages 327~336
DOI : 10.5140/JASS.2006.23.4.327
In this paper, gain loss of KVN (Korean VLBI Network) 21-m shaped Cassegrain antenna due to misalignment of antenna optics is calculated using ray-tracing method. It enables us to estimate alignment tolerances of feed and sub-reflector positioning. According to numerical results, KVN 21-m shaped Cassegrain antenna's gain loss is more sensitive to positions of feed and sub-reflector than in case of the equivalent classical Cassegrain antenna. The result of calculation is believed to be utilized as a possible guideline when checking the performance of the antenna system.
ANALYSIS ON IMPACTS OF KVN TO GEODETIC VLBI NETWORK
Cho, Jung-Ho ; Park, Jong-Uk ; Park, Pil-Ho ;
Journal of Astronomy and Space Sciences, volume 23, issue 4, 2006, Pages 337~344
DOI : 10.5140/JASS.2006.23.4.337
KVN simulation, which is focused on evaluating the impacts of KVN to geodetic VLBI network, was performed. The KVN is under construction with three radio telescopes VLBI system for radio astronomy and space geodesy. To distinguish the impacts of KVN on global and local scale networks, we designed two different sizes of VLBI networks, namely, KVN-Asia and KVN-Pacific. While the former consisted of Far East Asia region VLBI stations, the latter consisted of pacific region VLBT stations. The primary purpose of our simulation is quantitative evaluation of KVN impacts before and after the participation of KVN in the previous two virtual networks. We selected two different sets of parameters to be estimated in the simulation as indices of evaluating estimation precision: station coordinates and EOPs. The station coordinates are evaluating index for KVN-Asia and the EOPs are another evaluating index for KVN-Pacific. From the simulation results of comparisons between evaluating indexes, 50% and 20% of maximum improvements for KVN-Asia and KVN-Pacific were anticipated respectively. We expect that the space geodetic use of KVN will be focused on the several promising research fields which are proposed through the simulation results.
PRELIMINARY STUDY ON THE PLATE MOTION IN KOREAN PENINSULA WITH NEW KOREAN VLBI ARRAY
Kwak, Young-Hee ; Sasao, Tetsuo ; Cho, Jung-Ho ;
Journal of Astronomy and Space Sciences, volume 23, issue 4, 2006, Pages 345~354
DOI : 10.5140/JASS.2006.23.4.345
Korean Peninsula has been postulated to be on the Eurasian plate(EU). On the other hand, recent seismological works and GPS researches suggest that it is on a separate plate called the Amurian plate (AM). However, the GPS results we inconsistent with each other beyond the estimated statistical errors. Moreover, the estimated plate motion parameter, which we obtained from the velocity data of six Korean GPS stations, was not well agreeing with any existing results. Therefore, independent measurements are required to distinguish those results. In near future, we will have 4 VLBI stations in Korea. This compact Korean VLBI array is capable of achieving good determination of the plate motion parameters if it is located on stable sites. We estimated the precision of the AM motion parameters with the Korean VLBT array. The results showed that the Korean VLBI array would verify the existence of the AM, as far as the observation precision of 0.2-0.5mm/yr for station velocities is achieved. Therefore, new Korean geodetic VLBI array can contribute to crustal deformation studies in East Asia.
KOREAN MARS MISSION DESIGN USING KSLV-III
Song, Young-Joo ; Yoo, Sung-Moon ; Park, Eun-Seo ; Park, Sang-Young ; Choi, Kyu-Hong ; Yoon, Jae-Cheol ; Yim, Jo-Ryeong ; Choi, Joon-Min ; Kim, Byung-Kyo ;
Journal of Astronomy and Space Sciences, volume 23, issue 4, 2006, Pages 355~372
DOI : 10.5140/JASS.2006.23.4.355
Mission opportunities and trajectory characteristics for the future Korean Mars mission have designed and analyzed using KSIV-III(Korea Space Launch Vehicle-III). Korea's first space center, 'NARO space center' is selected as a launch site. For launch opportunities, year 2033 is investigated under considering the date of space center's completion with KSLV series development status. Optimal magnitude of various maneuvers, Trans Mars Injection (TMI) maneuver, Trajectory Correction Maneuver (TCM), Mars Orbit Insertion (MOI) maneuver and Orbit Trim Maneuver(OTM), which are required during the every Mars mission phases are computed with the formulation of nonlinear optimization problems using NPSOL software. Finally, mass budgets for upper stage (launcher for KSIV-III and spacecraft are derived using various optimized maneuver magnitudes. For results, daily launch window from NARO space center for successful Korean Mars mission is avaliable for next 27 minutes starting from Apr. 16. 2033. 12:17:26 (UTC). Maximum spacecraft gross mass which can delivered to Mars is about 206kg, with propellant mass of 109kg and structure mass of 97kg, when on board spacecraft thruster's Isp is assumed to have 290 sec. For upper stage, having structure ratio of 0.15 and Isp value of 280 sec, gross mass is about 1293kg with propellant mass of 1099kg and structure mass of 194kg. However, including 10% margins to computed optimal maneuver values, spacecraft gross mass is reduced to about 148kg with upper stage's mass of 1352kg. This work will give various insights, requiring performances to developing of KSIV-III and spacecraft design for future Korean Mars missions.
DEVELOPMENT OF A LOCAL MEAN TEMPERATURE EQUATION FOR GPS-BASED PRECIPITABLE WATER VAPOR OVER THE KOREAN PENINSULA
Ha, Ji-Hyun ; Park, Kwan-Dong ; Heo, Bok-Haeng ;
Journal of Astronomy and Space Sciences, volume 23, issue 4, 2006, Pages 373~384
DOI : 10.5140/JASS.2006.23.4.373
The Bevis' mean temperature equation (MTE) is generally used in estimating Precipitable Water Vapor (PWV) based on GPS measurements. Because the equation was derived from Worth American meteorological data, however, it may induce errors in PWV if the equation is applied to Korea which has different climate conditions. In this study, we developed a new MTE using local meteorological data. We compared PWVs from the new equation with those from the Bevis and two other local equations. The PWV differences from the four equations increase as a function of surface temperatures at the observation site, reaching up to
AN ANALYSIS OF THE EFFECT ON THE DATA PROCESSING OF KOREA GPS NETWORK BY THE ABSOLUTE PHASE CENTER VARIATIONS OF GPS ANTENNA
Baek, Jeong-Ho ; Lim, Hyung-Chul ; Jo, Jung-Hyun ; Cho, Sung-Ki ; Cho, Jung-Ho ;
Journal of Astronomy and Space Sciences, volume 23, issue 4, 2006, Pages 385~396
DOI : 10.5140/JASS.2006.23.4.385
The International GNSS Service (IGS) has prepared for a transition from the relative phase conte. variation (PCV) to the absolute PCV, because the terrestrial scale problem of the absolute PCV was resolved by estimating the PCV of the GPS satellites. Thus, the GPS data will be processed by using the absolute PCV which will be an IGS standard model in the near future. It is necessary to compare and analyze the results between the relative PCV and the absolute PCV for the establishment of the reliable processing strategy. This research analyzes the effect caused by the absolute PCV via the GPS network data processing. First, the four IGS stations, Daejeon, Suwon, Beijing and Wuhan, are selected to make longer baselines than 1000km, and processed by using the relative PCV and the absolute PCV to examine the effect of the antenna raydome. Beijing and Wuhan stations of which the length of baselines are longer than 1000km show the average difference of 1.33cm in the vertical component, and 2.97cm when the antenna raydomes are considered. Second, the 7 permanent GPS stations among the total 9 stations, operated by Korea Astronomy and Space Science Institute, are processed by applying the relative PCV and the absolute PCV, and their results are compared and analyzed. An insignificant effect of the absolute PCV is shown in Korea regional network with the average difference of 0.12cm in the vertical component.
A SINGULARITY AVOIDANCE STEERING LAW BASED ON THE MINIMIZATION TECHNIQUE
Oh, Hwa-Suk ; Lee, Bong-Un ; Rhee, Seung-Wu ; Lee, Seon-Ho ;
Journal of Astronomy and Space Sciences, volume 23, issue 4, 2006, Pages 397~404
DOI : 10.5140/JASS.2006.23.4.397
Geometric singularity problems are principle difficulties of single-gimbal control moment gyros in spacecraft attitude control. To overcome these singularities, many steering logics have been studied. In this paper, a new null motion steering law is suggested, which is based on the minimization of the directional components of output torque with respect to the required torque. The suggested steering law has been simulated and verified to work well around several critical singular points which have been classified as testing points of avoidance algorithm in previous literatures.
ADAPTIVE BACKSTEPPING CONTROL FOR SATELLITE FORMATION FLYING WITH MASS UNCERTAINTY
Lim, Hyung-Chul ; Bang, Hyo-Choong ; Lee, Sang-Jong ;
Journal of Astronomy and Space Sciences, volume 23, issue 4, 2006, Pages 405~414
DOI : 10.5140/JASS.2006.23.4.405
Satellite formation flying has become a critical issue in the aerospace engineering because it is considered as an enabling technology for many space missions. Thus, many nonlinear control theories have been developed for the tracking problem of satellite formation flying, which include full-nonlinear dynamics, external disturbances and parameter uncertainty. In this study, nonlinear adaptive control law is developed using an adaptive backstepping technique to solve the relative position tracking problem of the satellite formation flying in the presence of mass uncertainty and the bounded external disturbance. Simulation studies are included to demonstrate the proposed controller performance. The proposed controller is shown to guarantee the system stability against the external bounded disturbances in the presence of mass uncertainty.
DETERMINATION OF USER DISTRIBUTION IMAGE SIZE AND POSITION OF EACH OBSERVATION AREA OF METEOROLOGICAL IMAGER IN COMS
Seo, Jeong-Soo ; Seo, Seok-Bae ; Kim, Eun-Kyou ;
Journal of Astronomy and Space Sciences, volume 23, issue 4, 2006, Pages 415~424
DOI : 10.5140/JASS.2006.23.4.415
In this paper, requirements of Meteorological Administration about Meteorological Image. (MI) of Communications, Ocean and Meteorological Satellite (COMS) is analyzed for the design of COMS ground station and according to the analysis results, the distribution image size of each observation area suitable for satellite Field Of View (FOV) stated at the requirements of meteorological administration is determined and the precise satellite FOV and the size of distribution image is calculated on the basis of the image size of the determined observation area. The results in this paper were applied to the detailed design for COMS ground station and also are expected to be used for the future observation scheduling and the scheduling of distribution of user data.
DEVELOPMENT OF A MONITORING SYSTEM FOR AN INFRARED CAMERA
Cha, Sang-Mok ; Moon, Bong-Kon ; Jin, Ho ; Yuk, In-Soo ; Nam, Uk-Won ; Lee, Sung-Ho ; Park, Yung-Sik ; Cho, Seoung-Hyun ; Mok, Seung-Won ; Kim, Chun-Hwey ;
Journal of Astronomy and Space Sciences, volume 23, issue 4, 2006, Pages 425~434
DOI : 10.5140/JASS.2006.23.4.425
The KASINICS (KASI Nea.-Infrared Camera System) is a ground-based instrument developed by the Korea Astronomy and Space Science Institute (KASI). We developed a temperature and vacuum monitoring system for operating the KASINICS. The system consists of hardware and software parts. The acquired data we saved on a hard disk in a real-time mode. This system on also be applied to general cryogenic instruments. We tested our monitoring system for the cooling and vacuum performance of the KASINICS. The results show that our system is efficient and stable for the operation of the KASINICS.
DESIGN & STRUCTURAL ANALYSIS OF MULTI-OPTICAL MOUNT SYSTEME FOR TRACKING/OBSERVING ARTIFICIAL SPACE OBJECTS
Seol, K.H. ; Kim, S.J. ; Jang, M. ; Min, S.W. ; Mun, B.S. ;
Journal of Astronomy and Space Sciences, volume 23, issue 4, 2006, Pages 435~444
DOI : 10.5140/JASS.2006.23.4.435
Since artificial space objects are observable only in a short period of time and the characteristics of their motion is not exactly predictable, it is difficult to obtain both photometric and spectroscopic data by a set of observations. We have, therefore, designed a mount to load multi-optical instruments on the Kyung Hee University (KHU) satellite tracking and observation system for both photometric and spectroscopic observations of artificial space objects. In this paper, we have calculated the deformation of the remodeled mount using structural analyses for the loading of the multi-optical instruments. We have also deduced pointing errors of the mount occurring at tracking and observing artificial space objects. we have derived tracking reliably artificial space objects in our field of view and confirmed structural safety test of mount utilizing equivalent (von-mises) stress distribution.
CONCEPTUAL DESIGN OF ON BOARD DIGITAL BASE PART ON SATELLITE TO EFFECTIVELY INTERFACE THE DATA UPON SATELLITE REMOTE DEVICES
Koo, Cheol-Hea ; Yang, Koon-Ho ; Choi, Seong-Bong ;
Journal of Astronomy and Space Sciences, volume 23, issue 4, 2006, Pages 445~452
DOI : 10.5140/JASS.2006.23.4.445
In this paper, the conceptual design of satellite digital base put which is based upon data interface between satellite on-board computer and remote devices like satellite sub-components is presented. This conceptual design shows the unification of the interface between on-board computer and satellite remote devices and the hierarchical results of the interface level. A comparison of different system and merits and demerits of digital base part coming from this conceptual design is performed.
SPECIFIC ANALYSIS OF WEB CAMERA AND HIGH RESOLUTION PLANETARY IMAGING
Park, Young-Sik ; Lee, Dong-Ju ; Jin, Ho ; Han, Won-Yong ; Park, Jang-Hyun ;
Journal of Astronomy and Space Sciences, volume 23, issue 4, 2006, Pages 453~464
DOI : 10.5140/JASS.2006.23.4.453
Web camera is usually used for video communication between PC, it has small sensing area, cannot using long exposure application, so that is insufficient for astronomical application. But web camera is suitable for bright planet, moon, it doesn't need long exposure time. So many amateur astronomer using web camera for planetary imaging. We used ToUcam manufactured by Phillips for planetary imaging and Registax commercial program for a video file combining. And then, we are measure a property of web camera, such as linearity, gain that is usually using for analysis of CCD performance. Because of using combine technic selected high quality image from video frame, this method on take higher resolution planetary imaging than one shot image by film, digital camera and CCD. We describe a planetary observing method and a video frame combine method.