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COMPARISON OF HELICITY SIGNS IN INTERPLANETARY CMES AND THEIR SOLAR SOURCE REGIONS
조경석,박성홍,임은경,Cho, Kyungsuk,Park, Sunghong,Marubashi, Katsuhide,Gopalswamy, Nat,Akiyama, Sachiko,Yashiro, Seiji,Kim, Roksoon,Lim, Eunkyung 한국천문학회 2012 天文學會報 Vol.37 No.2
If all Coronal mass ejections (CMEs) have flux ropes, then the CMEs should keep their helicity signs from the Sun to the Earth according to the helicity conservation principle. We select 34 CME-ICME pairs whose source active regions (ARs) have continuous SOHO/MDI magnetogram data covering more than 24 hr without data gap during the passage of the ARs near the solar disk centre. The helicity signs in the ARs are determined by estimation of accumulating amounts of helicity injections through the photospheric surfaces in the entire source ARs. The helicity signs in the ICMEs are estimated by applying the cylinder model developed by Marubashi (2000) to 16 second resolution magnetic field data from the MAG instrument onboard the ACE spacecraft. It is found that 30 out of 34 events (88%) are helicity sign-consistent events, while 4 events (12%) are sign-inconsistent. Through a detailed investigation of the AR solar origins of the 4 exceptional events, we find that those exceptional events can be explained by the local AR helicity sign opposite to that of the entire AR helicity (2000 July 28 ICME), incorrectly reported solar source in CDAW (2005 May 20 ICME), or the helicity sign of the pre-existing coronal magnetic field (2000 October 13 and 2003 November 20 ICMEs). We conclude that the helicity signs of the ICMEs are quite consistent with those of the injected helicities in the AR regions where CMEs were erupted.
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.
조경석,권륜영,김록순,Cho, Kyungsuk,Gopalswamy, Nat,Kwon, Ryunyoung,Kim, Roksoon,Yashiro, Seiji 한국천문학회 2012 天文學會報 Vol.37 No.2
We examine the relationship between a type II radio burst that started from an unusually high frequency of 425 MHz (fundamental component) and an associated white-light coronal mass ejection on 2011 February 13. The radio burst had a drift rate of 2.5 MHz/sec, indicating a relatively high shock speed. From SDO AIA observations we find that a loop-like erupting front sweeps across high density coronal loops near the start time of the burst (17:34:15 UT). We find fragmented structures of the type II burst, which indicates the signature of the shock propagating through the multiple loops. The deduced distance of shock formation (0.06 Rs) from flare center and speed of the shock (1100 km $s^{-1}$) using the measured density from AIA/SDO observations are comparable to the height (0.05 Rs, from the solar surface) and speed (700 km $s^{-1}$) of the CME leading edge observed by STEREO/EUVI. We conclude that the type II burst could be onset even in the low corona (41 Mm or 0.06 Rs, above the solar surface) if a fast CME shock passes through the high density loops.
공동주택 마감공사시 발생되는 공간문제 분석에 관한 연구
조경석(Cho Gyoung-Suk),진상윤(Chin Sangyoon),김예상(Kim Yea-Sang) 대한건축학회 2003 大韓建築學會論文集 : 構造系 Vol.19 No.6
Construction builds a space on spaces. Construction requires a space to move, store, and fabricate materials, and to perform works. However, the required property of spaces change as the work progresses. In addition, the work space becomes insufficient where the multiple works are occurred concurrently. Therefore space requirements should be planned and controlled by construction managers to minimize congestions and interferences in a work space. This research identified patterns and reasons of problems related to work spaces during interior works in apartment housing projects. Also the degree of importance and the frequency of occurrence by each type of work space problems were surveyed through questionnaires. The results were compared and analyzed to assess the state of the recognition and to suggest directions for effective management of construction spaces. The results shows that the most demanding problems for improvements are insufficient work spaces and no clean-up after works, which requires planning of daily works and attitude changes through educations. More details and conclusions are discussed in this paper.
조경석(Kyungseok Cho) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The Wave Fan was developed for the past 10 years. In the developing procedures, many leading edge technologies were adapted such as Aeroacoustic analogy prediction, surface pressure measurements, Computational Fluid Dynamics and Laser Doppler Velocitimeter. The Wave Fan is well known because of its unique design. Now the Wave Fan becomes a best in class automotive part in the world and becomes a name of the lower noise fan. But for the specific vehicle application, it needs some modification and optimizations for the best of the system performance. In this paper we can discuss the surface response method to meet customer requirement and to optimize system performance. The uneven blade spacing technique is also applied to minimize the unpleasant discrete tonal noise.