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조경석,조경석,문용재,장비호,김수진,김연한,Park, Y.D.,Cho, K.S.,Moon, Y.J.,Jang, B.H.,Kim, S.J.,Kim, Y.H. 한국천문학회 2003 天文學論叢 Vol.18 No.1
In 2002, a new solar spectroscopic system with the Coelostat type has been installed at Korea Astronomical Observatory. It was designed to observe solar spectra in the range from 3000 to 8000${\AA}$ with the spectral resolution of 1${\AA}$/mm. The system is composed of a 40cm diameter Coelostat with 9m focal length, spectroscopic system with 600groove/mm grating, and a IK ${\times}$ IK CCD detector. By developing observational softwares for this system, we have successfully observed solar Ha spectra. In this paper, we development of telescope control and observational softwares.
김록순,조경석,박영득,문용재,김연한,심경진,Kim, K.S.,Cho, K.S.,Park, Y.D.,Moon, Y.J.,Kim, Y.H.,Sim, K.J. 한국천문학회 2003 天文學論叢 Vol.18 No.1
In this paper, we have re-examined the relative sunspot numbers from June 1987 to December 2002 observed at Korea Astronomy Observatory. For this we determined conversion factors (K) for each year data to derive the relative sunspot numbers. The estimated conversion factor ranges from 0.57 to 1.09 and has a trend to decrease with time, which seem to depend on the several effects such as observational system, observation methods, and experience of an observer. Our analysis shows that the newly-determined relative sunspot numbers are in much better agreements with the international sunspot numbers than the previously-determined ones in which the conversion factors were determined only four times. This result implies that we should determine the conversion factor for each year data. From these investigations, we also identified one and half solar cycles form our relative sunspot number.
김연한,문용재,조경석,박영득,최성환,장비호,김수진,Kim, Y.H.,Moon, Y.J.,Cho, K.S.,Park, Y.D.,Choi, S.H.,Jang, B.H.,Kim, S. 한국천문학회 2006 天文學論叢 Vol.21 No.2
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.
한국천문연구원 Hα 태양전면관측시스템의 바닥고르기 연구
박형민,김연한,봉수찬,박영득,조경석,장비호,최성환,나자경,이승민,채종철,Park, H.M.,Kim, Y.H.,Bong, S.C.,Park, Y.D.,Cho, K.S.,Jang, B.H.,Choi, S.,Nah, J.,Lee, S.M.,Chae, J. 한국천문학회 2008 天文學論叢 Vol.23 No.2
We have performed the flat-fielding correction for the $H{\alpha}$ full-disk monitoring system of KASI (Korea Astronomy and Space Science Institute), which is installed in the Solar Flare Telescope (SOFT) at the top of Bohyun Mountain. For this, we used a new method developed by Chae (2004), to determine the flat pattern from a set of relatively shifted images. Using this method, we successfully obtained the flat pattern for $H{\alpha}$ full-disk observations and compared our result with the image observed in Catania Astrophysical Observatory. The method that we used in this study seems to be quite powerful to obtain the flat image for solar observations. In near future, we will apply this method for the flat-fielding correction of all solar imaging instruments in KASI.
육지용(Yook, J.Y.),양현섭(Yang, H.S.),이창하(Lee, C.H.),조경석(Cho, K.S.),김광일(Kim, K.I.),권혁률(Kwon, H.R.),박용선(Park, Y.S.) 한국소음진동공학회 2011 한국소음진동공학회 논문집 Vol.21 No.7
This paper presents dynamic analysis of FCEV(fuel cell electric vehicle) turbo blower. To analyze the dynamic characteristics of turbo blower, FEA(finite element analysis) and experimental test are performed. Evaluations of stress safety for rotor sleeve and impeller due to rotational force and shrink fit are performed. Rotor dynamic analysis is conducted by Campbell diagram and structure vibration analyses are performed using FEA and experimental test. Through these results, noise sources of turbo blower are verified.