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김백민,최혜선,김성중,최우갑 한국기상학회 2017 Asia-Pacific Journal of Atmospheric Sciences Vol.53 No.1
Co-variability between the Southern Annular Mode (SAM) and the El Niño Southern Oscillation (ENSO) during the austral summer is examined, and it is found that there exists an apparent co-variability of a negative (positive) SAM during the mature period of El Niño (La Niña). However, this co-variability is largely controlled by the small number of strong ENSO cases. When strong ENSO cases are excluded, the correlation becomes nonsignificant. This behavior in the relationship between SAM and ENSO is supported by a series of general circulation model experiments with prescribed sea surface temperature boundary conditions that represent the incremental strengthening of El Niño (La Niña) conditions. The modeled Antarctic sub-polar jet exhibits similar behavior to that identified through observational analysis. Marked changes in both the magnitude and position of the sub-polar jet are largely controlled by particularly strong transient eddy forcing. Planetary wave forcing plays only a minor role in the co-variability, but it can explain in part the asymmetric response of the sub-polar jet between El Niño and La Niña.
김백민,최시영 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
We present the morphology of the polystyrene-b-poly(ethylene oxide) (PS-b-PEO) diblock copolymer and polystyrene homopolymer (PS homo) blends at the air/water interface. Based on the morphology, we construct a phase diagram using two variables, sum of PS mass in PS-b-PEO and mass of PS homo over total polymer mass, φ, and the ratio of molecular weight (Mn) of PS homo to Mn of PS in PS-b-PEO, α. In general, we find out both the increase of domain size and morphology transition from circular to cylindrical to planar morphology as φ increases, and only the similar morphology transition is seen as α goes up. Although this is observed in a typical morphology of PS-b-PEO as the relative PS block ratio and spreading concentration increase, our blends have two different features: 1) we can adjust the morphology easily by controlling the amount and Mn of PS homo; 2) New morphology that we call melt morphology is discovered for small α as PS homo act like plasticizer.