회전운동을 하는 끝단질량을 갖는 곡선형상 보의 동적 해석

학위논문(석사)--서울대학교 대학원 :항공우주공학과,1999.Maste

위성 관측을 통한 저위도 이온층 불균일 연구

학위논문(박사) - 한국과학기술원 : 물리학과, 2005.2, [ iv, 109 p. ]This work describes the global distribution and the characteristic features of equatorial plasma irregularities: equatorial plasma bubble (EPB) and low-latitude plasma blob. Primary data set was in-situ measurements of Korea Multi-Purpose Satellite-1 (KOMPSAT-1) at an altitude of 680 km at 2230 LT during the solar maximum period from June 2000 to August 2001. As supplementary data, ionospheric observation of DMSP F13 and F15 was used. EPBs can be observed at all longitudes around the magnetic dip equator in the equinoctial seasons with the peak occurrence in the American-Atlantic-African regions. During the northern summer EPBs occur predominantly in the magnetic north in the Indian and west Pacific regions, but are totally suppressed in the American-Atlantic sectors. During the northern winter EPBs are highly promoted in the America-Atlantic sectors but are suppressed in other longitude sectors, especially, in the Pacific sector. To explain the global EPB distributions, we investigate the growth conditions of Rayleigh-Taylor instability in several longitude sectors using the Mass Spectrometer Incoherent Scatter (MSIS) and International Reference Ionosphere (IRI) models. The simulation results indicate that the global EPB distribution can be understood better by considering the upward plasma drift velocity at post-sunset time weighted by the flux-tube integrated electron content in the lower F region. Meantime, the EPB occurrence is nearly anti-correlated with the degree of asymmetry in latitudinal plasma distribution at 1800 LT, 2130 LT, and 2250. So the asymmetry also can be used as a rough index for EPB forecast. The seasonal-longitudinal change of the asymmetry is in conflict with the current simple theories of inter-hemispheric plasma transport. Some other elements such as the thermospheric parameters should be considered. The relationship between $K_p$ index and EPB occurrence is consistent with existing reports. The effect of 27-day solar cycle is not cl...한국과학기술원 : 물리학과

Identification of emitting species by ultrafast time-resolved fluorescence and its application to excited state dynamics of pigment yellow 101

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A better utilization of medical facilities of CO-poisoning in seoul

학위논문(석사) - 한국과학기술원 : 산업공학과 경영과학 전공, 1981.2, [ [vii], 50, 52 p. ]한국과학기술원 : 산업공학과 경영과학 전공

The effects of industrial safety and working environments on productivity

학위논문(박사) - 한국과학기술원 : 경영과학과, 1985.2, [ v, 183 p. ]한국과학기술원 : 경영과학과

Classification and Causes of East Asian Marine Heatwaves during Boreal Summer

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