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Detectability Test of H2 Lyman-Werner Band Emission for Far-Ultraviolet Imaging Spectrograph, FIMS
선광일,경욱 민,광선 유,대희 이,수종 박,승한 오,용선 박,용하 김,욱원 남,한원용,인수 육,장현 박,종호 신,호진,Eric J. Korpela,Jerry Edelstein,Kaori Nishikida 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.43 No.42
Molecular hydrogen (H2) is excited by far-ultraviolet (far-UV) photons and emits uorescent emission in the far-UV bands and in the near- and the mid-infrared bands. Observations of H2 in these photodissociation regions (PDRs) are important in tracing star-forming molecular clouds and in understanding the interaction between newly born stars and molecular clouds. We use the typical PDR model of Sternberg to estimate the observing time (or integration time) required to detect PDRs with the Far-ultraviolet IMaging spectrograph (FIMS) onboard KAISTSAT-4, the rst Korean scientic satellite. The observing time is calculated using a formula based on a rigorous hypothesis testing for the detection limit, in contract to the often-used signal-to-noise ratio. The estimated observing time is also compared with the expected exposure time from one-year all-sky survey.
Vortex 하이브리드 로켓의 스월러와 pre-chamber 변화에 따른 연료 후퇴율에 관한 연구
김수종,김진곤 한국항공대학교 항공우주산업기술연구소 2003 航空宇宙産業技術硏究所 硏究誌 Vol.13 No.-
In this paper, an experimental study on the dependence of solid fuel regression rate of vortex hybrid rocket engine on the variation of swirler and pre-chamber was performed. Vortex hybrid rocket engine was designed and 10 types of swirler and 3 types of pre-chamber were used for this study. Experiments were consisted of three different cases. In the first case, the total inlet port area was held identical. Only the number of port was varied at 3, 4 and 5. In the second case, the inlet port diameter was held identical, so that the total inlet area was increased by 1/3 with each additional port. For the variation of pre-chamber, three different types were applied for this study, straight shape, 20 mm converging shape and 30 mm converging shape, respectively.
Synthesis of MgO nanoparticles using starch as precursor medium
김수종,한정화 한양대학교 세라믹연구소 2018 Journal of Ceramic Processing Research Vol.19 No.2
Nanocrystalline magnesium oxide (MgO) particles were prepared through liquid phase precursor (LPP) method usingmagnesium nitrate as starting material and starch as an impregnatig matrix. The materials obtained by LPP method weresubsequently annealed at 500-1,100 oC for 1-3 hrs to improve crystallinity and phase purity. Crystallization and the growth ofparticles were accelerated with increasing calcining temperature. Crystallization of MgO started around 500 oC, which thetemperature is pyrolysis of starch, cubic phase generated at 600 oC. Moreover, above 600 oC, calcining time had influence oncrystal growth. The obtained MgO nanoparticles were characterized by powder X-ray analysis (XRD), infrared (IR)spectroscopy, photoluminescence (PL), and field emission scanning electron microscopy (FE-SEM). The PL emission spectrumof MgO nanoparticles exhibits two emission peaks at 560 and 618 nm which are due to various structural defects. The cubiccrystal structure with crystalline size of 30-150 nm, is obtained at the calcination temperature of 500-900 oC.
Comparative Statics under Uncertainty with the Monotone Likelihood Ratio Order
김수종,류수열 한국경제학회 2004 The Korean Economic Review Vol.20 No.2
In a simple two asset portfolio problem with one-risky and one-safe asset, Landsberger and Meilijson (1990) have shown that a monotone likelihood ratio (MLR) improvement of random returns of the risky asset increases the demand for the asset for all investors with non-decreasing utilities. However, their comparative static statement is made only for the simplest case where the payoff function is linear in both the choice and the random variable. This paper improves the robustness of their result in two ways. One is that the same comparative static statement can also be made for cases of non-linear payoffs. Another improvement is given by extending the admissible set of changes in randomness with the same utility settings. When the concerned payoff is linear in the choice variable, we show that the MLR order is unduly restrictive for the comparative static result and replace it with a more general type of change in randomness, called a “one-side monotone likelihood ratio with respect to a point.”
김수종 대한전자공학회 1977 전자공학회지 Vol.14 No.4
능동과 /또는 결합성 소자를 포함하고 있는 회로망에 대한 일반화된 적선도를 정의하였다. 이 적선도는 신호유선도가 필요없이 전압선도와 전류선도로 부터 직접 구해지며 Mason의 행렬식을 계산하는데 이용되는 선도이다. 그리고 일반성을 갖는 회로망을 예제로 들어 음미하였다. A generalized product graph of the network containing active and/or coupled elements has been presented. This graph is obtained directly from the current graph and voltage graph and can be used to determine the Mason's determinant. An example is presented and discussed.