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Akademický článek

Vortex preconditioning of the 2021 sudden stratospheric warming: barotropic–baroclinic instability associated with the double westerly jets

Autor: J.-H. Yoo, H.-Y. Chun, M.-J. Kang

Publikováno v: Atmospheric Chemistry and Physics, Vol 23, Pp 10869-10881 (2023)

This study explores the abrupt split of the polar vortex in the upper stratosphere prior to a recent sudden stratospheric warming event on 5 January 2021 (SSW21) and the mechanisms of vortex preconditioning by using the Modern-Era Retrospective Analy

Externí odkaz: https://doaj.org/article/212c37bac88a48dd8076497b0f8fe9f2

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Akademický článek

Contributions of equatorial waves and small-scale convective gravity waves to the 2019/20 quasi-biennial oscillation (QBO) disruption

Autor: M.-J. Kang, H.-Y. Chun

Publikováno v: Atmospheric Chemistry and Physics, Vol 21, Pp 9839-9857 (2021)

In January 2020, unexpected easterly winds developed in the downward-propagating westerly quasi-biennial oscillation (QBO) phase. This event corresponds to the second QBO disruption in history, and it occurred 4 years after the first disruption of 20

Externí odkaz: https://doaj.org/article/cb984ec363c6453da3f7c026dd8e0128

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Akademický článek

Role of equatorial waves and convective gravity waves in the 2015/16 quasi-biennial oscillation disruption

Autor: M.-J. Kang, H.-Y. Chun, R. R. Garcia

Publikováno v: Atmospheric Chemistry and Physics, Vol 20, Pp 14669-14693 (2020)

In February 2016, the descent of the westerly phase of the quasi-biennial oscillation (QBO) was unprecedentedly disrupted by the development of easterly winds. Previous studies have shown that extratropical Rossby waves propagating into the deep trop

Externí odkaz: https://doaj.org/article/22e0855165f949ecb55431dd9f74cc2f

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Akademický článek

GaN based negative capacitance heterojunction field-effect transistors with

Autor: S.-W. Han, S.-K. Eom, M.-J. Kang, H.-S. Kim, K.-S. Seo, H.-Y. Cha

Publikováno v: Results in Physics, Vol 16, Iss , Pp 102950- (2020)

We demonstrated gallium nitride (GaN) based negative capacitance field-effect transistors (NCFETs) that achieve steep switching operation. Ferroelectric phase characteristics were successfully demonstrated using a 10 nm thick undoped-HfO2 ferroelectr

Externí odkaz: https://doaj.org/article/8fcc5fcf6b0f4b01b3bd6d656ce03234

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Akademický článek

Pre-stroke glycemic control is associated with early neurologic deterioration in acute atrial fibrillation-related ischemic stroke

Autor: J.-S. Kim, R.-Y. Kim, J.-K. Cha, H.W. Rha, M.-J. Kang, D.-H. Kim, H.-S. Park, J.-H. Choi, J.-T. Huh, I.-K. Lee

Publikováno v: eNeurologicalSci, Vol 8, Iss , Pp 17-21 (2017)

Background: It has been suggested that AF-related ischemic stroke (IS) that is accompanied by atherosclerotic burden have poorer outcomes. The aim of this study was to investigate the importance of pre-stroke glycemic control (PSGC) on the early neur

Externí odkaz: https://doaj.org/article/43fd018e486e464fa29275c8a65f8599

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Akademický článek

Tuning of a convective gravity wave source scheme based on HIRDLS observations

Autor: Q. T. Trinh, S. Kalisch, P. Preusse, M. Ern, H.-Y. Chun, S. D. Eckermann, M.-J. Kang, M. Riese

Publikováno v: Atmospheric Chemistry and Physics, Vol 16, Pp 7335-7356 (2016)

Convection as one dominant source of atmospheric gravity waves (GWs) has been the focus of investigation over recent years. However, its spatial and temporal forcing scales are not well known. In this work we address this open issue by a systemati

Externí odkaz: https://doaj.org/article/8efd01ef0e8c492589b3123034940935

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