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Your search keyword '"Kwak, Y.-S."' showing total 140 results
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140 results on '"Kwak, Y.-S."'

1. Validation of Ionospheric Specifications During Geomagnetic Storms: TEC and foF2 During the 2013 March Storm Event‐II

Author

Shim, J. S., primary, Song, I.‐S., additional, Jee, G., additional, Kwak, Y.‐S., additional, Tsagouri, I., additional, Goncharenko, L., additional, McInerney, J., additional, Vitt, A., additional, Rastaetter, L., additional, Yue, J., additional, Chou, M., additional, Codrescu, M., additional, Coster, A. J., additional, Fedrizzi, M., additional, Fuller‐Rowell, T. J., additional, Ridley, A. J., additional, Solomon, S. C., additional, and Habarulema, J. B., additional

Published
2023
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11. Polar middle atmospheric responses to medium energy electron (MEE) precipitation using numerical model simulations

Author

Lee, J.-H. (Ji-Hee), Jee, G. (Geonhwa), Kwak, Y.-S. (Young-Sil), Hwang, H. (Heejin), Seppälä, A. (Annika), Song, I.-S. (In-Sun), Turunen, E. (Esa), and Lee, D.-Y. (Dae-Young)

Subjects
energetic electron precipitation (EEP), odd-nitrogen, odd-hydrogen, mesosphere, medium energy electron (MEE), ozone loss
Abstract

Energetic particle precipitation (EPP) is known to be an important source of chemical changes in the polar middle atmosphere in winter. Recent modeling studies further suggest that chemical changes induced by EPP can also cause dynamic changes in the middle atmosphere. In this study, we investigated the atmospheric responses to the precipitation of medium-to-high energy electrons (MEEs) over the period 2005–2013 using the Specific Dynamics Whole Atmosphere Community Climate Model (SD-WACCM). Our results show that the MEE precipitation significantly increases the amounts of NOₓ and HOₓ, resulting in mesospheric and stratospheric ozone losses by up to 60% and 25% respectively during polar winter. The MEE-induced ozone loss generally increases the temperature in the lower mesosphere but decreases the temperature in the upper mesosphere with large year-to-year variability, not only by radiative effects but also by adiabatic effects. The adiabatic effects by meridional circulation changes may be dominant for the mesospheric temperature changes. In particular, the meridional circulation changes occasionally act in opposite ways to vary the temperature in terms of height variations, especially at around the solar minimum period with low geomagnetic activity, which cancels out the temperature changes to make the average small in the polar mesosphere for the 9-year period.

Published
2021

14. Preface

Author

Stoica, A., Kang, B., Ramos, C., Kim, H. k., Cho, H. s., Ma, J., Kim, K. J., Pissinou, N., Gervasi, O., Kim, T. h., Vasilakos, T., Arslan, T., Fang, T., Grosky, W. I., Zhang, Y., Kwak, Y. S., CUZZOCREA, Alfredo Massimiliano, A. Stoica, A. Cuzzocrea. B. Kang, C. Ramos, H.-k. Kim, H.-s. Cho, J. Ma, K.J. Kim, N. Pissinou, O. Gervasi, T. Vasilakos, T. Arslan, W.-c. Fang, W.I. Grosky, Y. Zhang, Y.-S. Kwak, Stoica, A., Cuzzocrea, Alfredo Massimiliano, Kang, B., Ramos, C., Kim, H. k., Cho, H. s., Ma, J., Kim, K. J., Pissinou, N., Gervasi, O., Kim, T. h., Vasilakos, T., Arslan, T., Fang, T., Grosky, W. I., Zhang, Y., and Kwak, Y. S.

Subjects
Future Generation Information Technology
Published
2015

46. First report of leaf spot on kiwifruit caused by Phomasp. in Korea

Author

Kwon, Y, Hong, SW, Kwack, Y-B, and Kwak, Y-S

Abstract

ABSTRACTSmall, dark brown leaf spots consistent with symptoms caused by Phomasp. were observed on kiwifruit (Actinidia deliciosacv. Hayward) at an orchard in Sacheon, South Korea. The causal agent was isolated from the spots and identified by morphological and molecular characteristics by sequencing the internal transcribed spacer region. To establish Koch’s postulates, the pathogen was inoculated on to leaves in a pathogenicity test and reisolated from the developed lesions. Phomasp. has been reported as a causal agent of kiwifruit leaf spot disease in New Zealand and Italy. However, this is the first report of leaf spot disease caused by Phomasp. in Korea.

Published
2016
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50. Survey on Medical Records and EHR in Asia-Pacific Region.

Author

Kimura, M., Croll, P., Li, B., Wong, C. P., Gogia, S., Faud, A., Kwak, Y.-S., Chu, S., Marcelo, A., Chow, Y.-H., Paoin, W., and Li, Y.-C.

Subjects
MEDICAL records, MEDICAL informatics, HOSPITAL records, SURVEYS
Abstract

The article presents a survey conducted in the summer of 2009 to clarify health record background information in the Asia-Pacific region for planning of medical information systems. It has been stated that the purpose of the survey was to know current position of medical records and Electronic Health Record (EHR) at various countries of the region for the benefit of designers and the Information Technology (IT) systems and policy maker of the healthcare.

Published
2011
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