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403 results on '"Kim, Yong Pyo"'

8. The Korea–United States Air Quality (KORUS-AQ) field study

Author

Crawford, James H, Ahn, Joon-Young, Al-Saadi, Jassim, Chang, Limseok, Emmons, Louisa K, Kim, Jhoon, Lee, Gangwoong, Park, Jeong-Hoo, Park, Rokjin J, Woo, Jung Hun, Song, Chang-Keun, Hong, Ji-Hyung, Hong, You-Deog, Lefer, Barry L, Lee, Meehye, Lee, Taehyoung, Kim, Saewung, Min, Kyung-Eun, Yum, Seong Soo, Shin, Hye Jung, Kim, Young-Woo, Choi, Jin-Soo, Park, Jin-Soo, Szykman, James J, Long, Russell W, Jordan, Carolyn E, Simpson, Isobel J, Fried, Alan, Dibb, Jack E, Cho, SeogYeon, and Kim, Yong Pyo

Subjects
KORUS-AQ, Seoul, Air quality, Ozone, PM2.5, Transboundary pollution
Abstract

The Korea-United States Air Quality (KORUS-AQ) field study was conducted during May-June 2016. The effort was jointly sponsored by the National Institute of Environmental Research of South Korea and the National Aeronautics and Space Administration of the United States. KORUS-AQ offered an unprecedented, multi-perspective view of air quality conditions in South Korea by employing observations from three aircraft, an extensive ground-based network, and three ships along with an array of air quality forecast models. Information gathered during the study is contributing to an improved understanding of the factors controlling air quality in South Korea. The study also provided a valuable test bed for future air quality-observing strategies involving geostationary satellite instruments being launched by both countries to examine air quality throughout the day over Asia and North America. This article presents details on the KORUS-AQ observational assets, study execution, data products, and air quality conditions observed during the study. High-level findings from companion papers in this special issue are also summarized and discussed in relation to the factors controlling fine particle and ozone pollution, current emissions and source apportionment, and expectations for the role of satellite observations in the future. Resulting policy recommendations and advice regarding plans going forward are summarized. These results provide an important update to early feedback previously provided in a Rapid Science Synthesis Report produced for South Korean policy makers in 2017 and form the basis for the Final Science Synthesis Report delivered in 2020.

Published
2021

38. Parameterization of polydisperse aerosol optical properties during hygroscopic growth

Author

Jung, Chang H., Han, Kyung Man, Yoon, Young Jun, Kim, Dongchul, Lee, Ji Yi, Lee, Hyung-Min, Um, J., Lee, S. S., and Kim, Yong Pyo

Subjects
Environmental Chemistry, General Materials Science, Pollution
Abstract

Aerosol water uptake and the related influence on its optical properties owing to the hygroscopic growth of polydisperse aerosols have a significant effect on air quality and climate. This study develops an analytical parameterization for a single hygroscopic optical parameter and the scattering enhancement factor for polydisperse aerosol sizes. Polydisperse lognormal size distributions for geometric mean diameters of 0.05–1 µm and geometric standard deviations of 1.3–2.5 are considered with real refractive indices between 1.35 and 1.6. The analytical expression obtained for the optical parameter is compared to Mie theory and reasonable agreements within the size range investigated in this study are observed. Further, our results show that the analytical expression could express polydispersed aerosol optical properties as a function of geometric mean diameter and geometric standard deviation of a lognormal distribution and the refractive index. The obtained analytical expression can be efficiently used for 3D models with a reduced computational burden. Copyright © 2023 American Association for Aerosol Research

Published
2023
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41. A Smart Sensor Overlay Network for Ubiquitous Computing

Author

Jung, Eui-Hyun, Kim, Yong-Pyo, Park, Yong-Jin, Han, Su-Young, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Rangan, C. Pandu, editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Stajano, Frank, editor, Kim, Hyoung Joong, editor, Chae, Jong-Suk, editor, and Kim, Seong-Dong, editor

Published
2007
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42. An Attribute-Based Naming Architecture for Wireless Sensor Networks Using a Virtual Counterpart Overlay Network

Author

Jung, Eui-Hyun, Kim, Yong-Pyo, Park, Yong-Jin, Cho, Seong-Yun, Han, Su-Young, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Havinga, Paul, editor, Lijding, Maria, editor, Meratnia, Nirvana, editor, and Wegdam, Maarten, editor

Published
2006
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49. Effects of Top and Bottom Electrodes Materials and Operating Ambiance on the Characteristics of MgF x Based Bipolar RRAMs.

Author

Das, Nayan C., Kim, Yong-Pyo, Hong, Sung-Min, and Jang, Jae-Hyung

Subjects
*ELECTRODES, *SURFACE roughness, *RECORDS management
Abstract

The effects of electrode materials (top and bottom) and the operating ambiances (open-air and vacuum) on the MgFx-based resistive random-access memory (RRAM) devices are studied. Experiment results show that the device's performance and stability depend on the difference between the top and bottom electrodes' work functions. Devices are robust in both environments if the work function difference between the bottom and top electrodes is greater than or equal to 0.70 eV. The operating environment-independent device performance depends on the surface roughness of the bottom electrode materials. Reducing the bottom electrodes' surface roughness will reduce moisture absorption, minimizing the impact of the operating environment. Ti/MgFx/p+-Si memory devices with the minimum surface roughness of the p+-Si bottom electrode show operating environment-independent electroforming-free stable resistive switching properties. The stable memory devices show promising data retentions of >104 s in both environments with DC endurance properties of more than 100 cycles. [ABSTRACT FROM AUTHOR]

Published
2023
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