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Heliocentric Potential (HCP) Prediction Model for Nowscast of Aviation Radiation Dose
Junga Hwang,Kyung-Chan Kim,Kyunghwan Dokgo,Enjin Choi,Hang-Pyo Kim 한국우주과학회 2015 Journal of Astronomy and Space Sciences Vol.32 No.1
It is well known that the space radiation dose over the polar route should be carefully considered especially when the space weather shows sudden disturbances such as CME and flares. The National Meteorological Satellite Center (NMSC) and Korea Astronomy and Space Science Institute (KASI) recently established a basis for a space radiation service for the public by developing a space radiation prediction model and heliocentric potential (HCP) prediction model. The HCP value is used as a critical input value of the CARI-6 and CARI-6M programs, which estimate the aviation route dose. The CARI-6/6M is the most widely used and confidential program that is officially provided by the U.S. Federal Aviation Administration (FAA). The HCP value is given one month late in the FAA official webpage, making it difficult to obtain real-time information on the aviation route dose. In order to overcome this limitation regarding time delay, we developed a HCP prediction model based on the sunspot number variation. In this paper, we focus on the purpose and process of our HCP prediction model development. Finally, we find the highest correlation coefficient of 0.9 between the monthly sunspot number and the HCP value with an eight month time shift.
Hwang, Junga,Dokgo, Kyunghwan,Choi, Enjin,Park, Jong-Sun,Kim, Kyung-Chan,Kim, Hang-Pyo 한국우주과학회 2014 Journal of Astronomy and Space Sciences Vol.31 No.1
There has been a rapid increase of the concern on the space radiation effect on pilots, crew and passengers at the commercial aircraft altitude (~ 10 km) recently. It is because domestic airline companies, Korean Air and Asiana Airlines have just begun operating the polar routes over the North Pole since 2006 and 2009 respectively. CARI-6 and CARI-6M are commonly used space radiation estimation programs which are provided officially by the U.S. federal aviation administration (FAA). In this paper, the route doses and the annual radiation doses for Korean pilots and cabin crew were estimated by using CARI-6M based on 2012 flight records. Also the modeling concept was developed for our own space radiation estimation program which is composed of GEANT4 and NRLMSIS00 models. The GEANT4 model is used to trace the incident particle transports in the atmosphere and the NRLMSIS00 model is used to get the background atmospheric densities of various neutral atoms at the aircraft altitude. Also presented are the results of simple integration tests of those models and the plan to include the space weather variations through the solar proton event (SPE) prediction model such as UMASEP and the galactic cosmic ray (GCR) prediction model such as Badhwar-O’Neill 2010.
독고향,배재남,강민회,DokGo, Hyang,Bae, Jae-Nam,Kang, Min-Hee 한국정신신체의학회 1998 정신신체의학 Vol.6 No.1
Objectives : This study was performed to evaluate the status of psychiatric consultation at a newly opened university hospital, to explore problems related to psychiatric consultation and to contribute for future consultation to be more systematic and more efficient. Methods: The subjects of this study were 284 patients hospitalized at Inha University Hospital between September 1, 1996 and August 31, 1997, who were referred for psychiatric consultation during hospitalization. This study was evaluated demographical characteristics of referred patients, resons for referral, recommendations by psychiatric consultant, clinical diagnoses, psychiatric diagnoses, relationship between referral time and hospitalization following the day of consultation and consultation referral types based upon psychiatrists' reports and patients' medical charts. Results : Most common patients referred to consultation were females aged 20s who visited at the department of internal medicine and related to the risk of suicidal attempts. Mood disorder was the most frequent psychiatric diagnosis, and the most common recommendations were to use psychopharmacological treatment along with outpatient visits. The 30% of subjects were referred to consultation within a day after hospitalization. In the case of consultation referral timing within two days and after three days, there was significant difference between early consultation and shorter hospitalization following the day of consultation. Most frequent type of consultation(29.6%) was categorized as IIIa type(physical complication type as a "Mending" request type). Conclusion : In review of consultation referral timing and consultation referral type of the subjects, who were referred for psychiatric consultation for one year at a newly opened University Hospital, referrals were found to be made within two days after their admission to hospital(50.7%), which was observed to be early request. We found that there was significant association between early consultation and shorter hospitalization following the day of consultation. The physical complication type(29.6%) which belongs to "Mending" request type was found to be the most frequent consultation referral type. This result indicates that more systematic psychiatric consultation is needed for the future.
Simulation Study of Solar Wind Interaction with Lunar Magnetic Fields
Choi, Cheong Rim,Dokgo, Kyunghwan,Woo, Chang Ho,Min, Kyoung Wook The Korean Space Science Society 2020 Journal of Astronomy and Space Sciences Vol.37 No.1
Particle-in-cell simulations were performed to understand the interaction of the solar wind with localized magnetic fields on the sunlit surface of the Moon. The results indicated a mini-magnetosphere was formed which had a thin magnetopause with the thickness of the electron skin depth. It was also found that the solar wind penetrated into the cavity of the magnetosphere intermittently rather than in a steady manner. The solar wind that moved around the magnetosphere was observed to hit the surface of the Moon, implying that it may be the cause of the lunar swirl formation on the surface.