• 천문학회보
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• 제41권2호
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• pp.67.3-68
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• 2016

An X1.6 flare occurred in AR 12192 on 2014 October 22 around 14:06 UT and was observed by Hinode, IRIS, SDO and RHESSI. We analyze a bright kernel which produces a white light flare (WLF) with continuum enhancement and a hard X-ray (HXR) peak. Taking advantage of the spectroscopic observations of IRIS and EIS, we measure the temporal variation of the plasma properties in the bright kernel in the chromosphere and corona. We found that explosive evaporation was observed when the WLF occurred, even though the intensity enhancement in hotter lines is quite weak. The temporal correlation of the WLF, HXR peak, and evaporation flows indicates that the WLF was produced by accelerated electrons. To understand the white light emission processes, we calculated the deposited energy flux from the non-thermal electrons observed by RHESSI and compared it to the dissipated energy estimated from the chromospheric lines (Mg II triplet) observed by IRIS. The deposited energy flux from the non-thermal electrons is about $3.1{\times}10^{10}erg\;cm^{-2}s^{-1}$ when we assume a cut-off energy of 20 keV. The estimated energy flux from the temperature changes in the chromosphere measured from the Mg II subordinate line is about $4.6-6.7{\times}10^9erg\;cm^{-2}s^{-1}$, 15 - 22 % of the deposited energy. By comparison of these estimated energy fluxes we conclude that the continuum enhancement was directly produced by the non-thermal electrons.

• 한국전자파학회논문지
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• 제26권9호
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• pp.821-827
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• 2015

태양 흑점 폭발로 인해 방출되는 전자파는 지구상 낮 지역의 전파 통신에 장애를 일으킨다. 전세계에서 사용하는 태양 흑점 폭발 경보의 등급은 Geostationary Operational Environmental Satellite의 X선 세기에 따라 분류되고, 통신 장애를 판단한다. 하지만 태양과 직하점이 지구 자전에 따라 변하기 때문에 동일한 경보라도 통신 장애 영향은 같지 않다. 이러한 문제를 해결하기 위해 단파 통신을 전파 스펙트럼으로 수신하고, 통신 두절 여부를 모니터링하는 시스템을 개발하였다. 이 시스템은 단파 스펙트럼을 실시간 측정한 후 매분마다 자동으로 신호대 잡음비를 산출하고, ITU 권고의 간섭기준에 비교하여 통신 두절 시간을 산출한다.

• Journal of Astronomy and Space Sciences
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• 제26권4호
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• pp.479-486
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• 2009

태양 주기 23 기간 동안 발생한 태양 고에너지 양성자 이벤트(Solar Proton Events, SPE)와 그와 연관된 코로나 물질 방출(Corona Mass Ejection, CME) 사이의 상관관계를 통계적으로 살펴보았다. 1997-2006년 동안 일어난 63개의 SPE-CME 데이터 쌍을 조사해 본 결과, CME의 속도는 SPE의 상승 시간(rise time) 및 지속 시간(duration time) 등과 상관 계수가 높게 나타났다. 특별히 CME의 지구방향 인자(earthward direction parameter)는 SPE의 최대 플럭스와 높은 상관 계수를 보여 주었다. 기존의 태양 플레어 세기가 SPE의 세기에 미치는 영향은 CME의 지구방향 인자가 SPE의 플럭스의 세기에 미치는 영향과 그 상관계수가 유사하게 나타났다. 특히 SPE와 CME 지구 방향 인자와의 상관관계가 좋은 데이터들의 공통적인 특성은 모두 매우 빠른(>1400km/s) halo CME인 것으로 나타났다.

• Clinical and Experimental Reproductive Medicine
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• 제32권3호
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• pp.261-268
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• 2005

Objective: To compare the clinical results and pregnancy outcomes of in vitro fertilization (IVF) between GnRH antagonist cycles and GnRH agonist (GnRH-a) cycles including flare-up and long protocol in women with advanced age. Materials and Methods: Retrospective clinical study. From January 2001 to September 2003, IVF cycles of female patient 37 years over were included in this study. GnRH-a long protocol (62 cycles, 61 patients) and GnRH antagonist multi-dose flexible protocol (66 cycles, 51 patients) were compared with the control group of GnRH-a flare-up protocol (151 cycles, 138 patients). IVF cycles for non-obstructive azoospermia (NOA), endometriosis III, IV and polycystic ovarian syndrome (PCOS) were excluded in this study. Clinical results such as total gonadotropin dose, serum E2 on hCG administration, the number of retrieved oocytes and the pregnancy outcomes - clinical pregnancy rate (CPR), implantation rate (IR) and live birth rate (LBR) per embryo transfer - were compared. Results: There were significant differences in the total dose of gonadotropin (GnRH-a flare-up vs. GnRH-a long vs. GnRH-antagonist; 41.8 vs. 54.7 vs. 24.8), serum E2 on hCG administration (1787.2 vs. 1881.6 vs. 788.0), the numbers of retrieved oocytes (8.1 vs. 11.1 vs. 4.5) and endometrial thickness (9.1 vs. 10.4 vs. 8.0) which were significantly lower in GnRH-antagonist cycles. But pregnancy outcomes shows no significant differenced in CPR (25.0% vs. 35.8% vs. 24.5%), IR (11.7% vs. 12.3% vs. 10.1%) and LBR (15.8% vs. 28.3% vs. 15.1%) Conclusion: In women with advanced age, GnRH-antagonist cycles can result in comparable pregnancy outcomes to GnRH-a cycles including flare-up and long protocol. GnRH-a long protocol show higher CPR, IR and LBR than GnRH antagonist multi-dose flexible protocol and flare-up protocol without significant differences.

• 천문학논총
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• 제12권1호
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• pp.47-62
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• 1997

In this paper we present a newly improved telescope control software and a newly developed data analysis software package for effective use of the Solar Flare Telescope(SOFT) The telescope control software permits us to make not only auto tacking of the SOFT, but also quantitative measurement of the solar irradiation, allowing us to provide weather monitorings. In addition we introduce an IDL widget software package for both monochromatioc (MONO version) and polarimetric data (VMG version) analysis. The MONO version is capable of loading FITS files, changing colors and contrast, image processing, displaying plots, and saving displayed plots by selected formats The VMG version, on the other hand provides a calibration of polarimetric data and plots of reduced vector magnetic fields.

• 대한한의학회지
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• 제32권4호
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• pp.159-166
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• 2011

Objectives: This study reports using Hyungbangsabaksan to cure Soyangin Yangdokbalban (陽毒發斑) appealing Systemic Allergic Contact Dermatitis. Methods: After diagnosing the patient showing Papuloerythematous with no blisters in the body as a Soyangin Yangdokbalban (陽毒發斑), we prescribed the patient with Hyungbangsabak-san. We compared the condition of the patient before and after medication with photo shots. Results: After treatment, Papuloerythematous which was seen with the naked eye disappeared and various skin symptoms such as itching and warmth in the flare area also improved. Conclusions: After treatment, the symptoms of the patient who after eating lacquer chicken showed improvement.

• 대한생식의학회:학술대회논문집
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• 대한불임학회 2006년도 제51차 추계학술대회
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• pp.151-152
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• 2006

• 한국우주과학회:학술대회논문집(한국우주과학회보)
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• 한국우주과학회 2009년도 한국우주과학회보 제18권2호
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• pp.37.1-37.1
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• 2009

Solar type II radio burst is regarded as a signature of coronal shock. However its association with coronal mass ejections (CMEs)-driven shock and/or flare blast waves remains controversial. On December 31 2007, SOHO/LASCO and STEREO/COR observed a CME that occurred on the east limb of the Sun. Meanwhile, two type II bursts were observed sequently by KASI/E-Callisto and the Culgoora radio observatory during the CME apparence time. In this study, we estimate kinematics of the two coronal shocks from dynamic spectrum of the multiple type II bursts and compare with the kinematics of the CME derived from the space observations. An origin of the multiple type II bursts is inspected and discussed briefly.

• Journal of Astronomy and Space Sciences
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• 제24권2호
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• pp.125-134
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• 2007

이 연구에서는 태양 및 지자기 활동에 의해 발생한 우주환경변화가 우리나라 위성인 아리랑위성1호(KOMPSAT-1)의 궤도에 미치는 영향을 분석하였다. 인공위성의 궤도변화는 정상적인 상태에서도 자연적인 섭동에 의해 지속적으로 발생하지만, 거대한 태양폭발에 의한 지구 주변 우주환경이 급격히 변화할 때 고층대기의 밀도변화로 인해 크게 발생한다. 특히 이러한 현상은 아리랑위성 1호와 같이 저궤도 상에서 운영되는 위성에 직접적인 영향을 미친다. 이 때, 태양활동에 의한 지구 주변 우주환경의 변화는 크게 두 가지로 구분할 수 있다. 하나는 태양 플레어 (Flare)가 폭발했을 때 고에너지 복사(Radiation)로 인해 지구 고층대기가 가열되어 팽창하고 이런 결과로 고층대기에 있는 중성입자밀도가 급격히 증가하는 것이다. 다른 하나는 코로나 물질 방출(Coronal Mass Ejections) 등에 의해 발생한 지자기폭풍기간 동안 플라즈마 대류와 입자들의 하강으로 전기장이 강해져 상당량의 줄가열(Joule heating)과 하강입자가열(precipitating particle heating)이 발생하고 이로 인해 중성입자밀도가 증가하는 것이다. 두 가지 원인에 대한 영향을 구분하여 알아보기 위해, 우리는 태양 및 지자기 자료를 면밀히 분석하여 2001년에서 2002년 동안 5개의 기간을 선정하였다. 그 결과 위성의 대기저항가속도는 태양의 극자외선(Extreme Ultra-Violet)의 증가와 함께 약 하루 정도의 시간 지연을 가지고 유사하게 변화하고 있음을 확인하였다(R=0.92). 그리고 지자기폭풍이 발생한 기간동안 대기저항가속도는 지자기폭풍에 의한 Dst 변화와 상당히 유사하게 그리고 거의 동시에 급격히 변화하는 것을 확인하였다. 마지막으로 우리는 위성의 대기저항가속도의 변화는 전반적으로는 오랜 기간 동안 고에너지 복사에 의한 효과로 나타나고 있으나 짧은 기간(하루 미만) 동안 크게 발생하는 대기저항가속도의 변화는 지자기폭풍에 의한 효과로 보고 있다.

• 천문학논총
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• 제15권spc2호
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• pp.21-25
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• 2000

The ionosphere, the atmosphere of the earth ionized by solar radiations, has been strongly varied with solar activity. The ionosphere varies with the solar cycle, the seasons, the latitudes and during any given day. Radio wave propagation through or in the ionosphere is affected by ionospheric condition so that one needs to consider its effects on operating communication systems normally. For examples, sporadic E may form at any time. It occurs at altitudes between 90 to 140 km (in the E region), and may be spread over a large area or be confined to a small region. Sometimes the sporadic E layer works as a mirror so that the communication signal does not reach the receiver. And radiation from the Sun during large solar flares causes increased ionization in the D region which results in greater absorption of HF radio waves. This phenomenon is called short wave fade-outs. If the flare is large enough, the whole of the HF spectrum can be rendered unusable for a period of time. Due to events on the Sun, sometimes the Earth's magnetic field becomes disturbed. The geomagnetic field and the ionosphere are linked in complex ways and a disturbance in the geomagnetic field can often cause a disturbance in the F region of the ionosphere. An enhancement will not usually concern the HF communicator, but the depression may cause frequencies normally used for communication to be too high with the result that the wave penetrates the ionosphere. Ionospheric storms can occur throughout the solar cycle and are related to coronal mass ejections (CMEs) and coronal holes on the Sun. Except the above mentioned phenomena, there are a lot of things to affect the radio communication. Nowadays, radio technique for probing the terrestrial ionosphere has a tendency to use satellite system such as GPS. To get more accurate information about the variation of the ionospheric electron density, a TEC measurement system is necessary so RRL will operate the system in the near future.