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3. Perceived Income Changes, Saving Motives, and Household Savings

Author

Shin, Su Hyun and Kim, Kyoung Tae

Abstract

Using the 2007-2009 Survey of Consumer Finances panel dataset, we investigate whether and how changes in perceived income and saving motives are related to demand for household savings in the United States after the Great Recession. Households that perceive their current income as lower, relative to normal years are less likely to save than those who view that their income is the same as the reference point. This result holds only for those who experienced a significant negative income shock during the Great Recession. Among five major saving motives, saving for an emergency is an important factor in explaining the likelihood of saving. This study suggests that financial planners and educators should pay close attention to the role of households' income perception and saving motives and should account for the resulting potential psychological biases in households' saving decisions.

Published
2018

8. Vertical Profiles of PM 2.5 and O 3 Measured Using an Unmanned Aerial Vehicle (UAV) and Their Relationships with Synoptic- and Local-Scale Air Movements.

Author

Hwang, Hyemin, Lee, Ju Eun, Shin, Seung A., You, Chae Rim, Shin, Su Hyun, Park, Jong-Sung, and Lee, Jae Young

Subjects
AIR travel, AIR pollutants
Abstract

The vertical air pollutant concentrations and their relationships with synoptic- and local-scale air movement have been studied. This study measured the vertical profiles of PM2.5 and O3 using an unmanned aerial vehicle during summer in South Korea and analyzed the characteristics of the measured profiles. To understand the impact of synoptic air movements, we generated and categorized the 48 h air trajectories based on HYSPLIT, and we analyzed how the vertical profiles varied under different categories of long-range transport. We found that the vertical PM2.5 concentration has a positive gradient with altitude when more polluted air was transported from China or North Korea and has negative gradient when cleaner air was transported from the East Sea. Unlike PM2.5, the O3 concentration did not depend significantly on the long-range transport scenario because of the short photochemical lifetime of O3 during summer. For local-scale air movements, we found no significant impact of local wind on the measured profiles. [ABSTRACT FROM AUTHOR]

Published
2024
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16. Physicochemical characteristics and seasonal variations of PM2.5 in urban, industrial, and suburban areas in South Korea.

Author

Hwang, Kyucheol, Kim, Jeongho, Lee, Jae Young, Park, Jong-Sung, Park, Sechan, Lee, Gahye, Kim, Chang Hyeok, Kim, Pilho, Shin, Su Hyun, Lee, Kwang Yul, An, Joon-Young, Park, Jungmin, and Kim, Jong Bum

Abstract

Among countries that are a part of the Organization for Economic Co-operation and Development, South Korea is the most exposed to PM2.5. Despite the country having implemented various strategies to limit PM2.5 emissions, its concentrations are still high enough to pose serious environmental and health concerns. Herein, we monitored various physiochemical properties of PM2.5 across different regions in South Korea from January 1 to December 31, 2021. Specifically, the study area consisted of the city center, industrial complexes, and suburban areas. Before analyzing dynamics of emissions specific to each site, the Clean Air Policy Support System data for the three areas were compared to elucidate their respective primary emission sources. The particle concentrations for the three areas were 21.8–26.44 µg/m3, with the highest concentrations being observed in March. All the three areas exhibited high ratios of NO3− across all seasons. The particle number concentrations in the three sites were 1.3–1.5 × 107, and the peak points of the concentrations were different in every site: city center (40 nm), industrial complexes (60 nm), and suburban areas (80 nm). We also conducted potential source contribution function and conditional bivariate probability function analyses. These analyses were conducted to determine the inflow direction of the pollution sources for high PM2.5 episodes. For the episodes that occurred in spring and winter, there were no differences in the PM2.5 concentrations between the three sites. Overall, the insights gained from this study offer a framework for developing air-quality management policies in South Korea, specifically in the context of PM2.5 emissions. [ABSTRACT FROM AUTHOR]

Published
2023
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26. Physicochemical characteristics and seasonal variations of PM2.5in urban, industrial, and suburban areas in South Korea

Author

Hwang, Kyucheol, Kim, Jeongho, Lee, Jae Young, Park, Jong-Sung, Park, Sechan, Lee, Gahye, Kim, Chang Hyeok, Kim, Pilho, Shin, Su Hyun, Lee, Kwang Yul, An, Joon-Young, Park, Jungmin, and Kim, Jong Bum

Abstract

Among countries that are a part of the Organization for Economic Co-operation and Development, South Korea is the most exposed to PM2.5. Despite the country having implemented various strategies to limit PM2.5emissions, its concentrations are still high enough to pose serious environmental and health concerns. Herein, we monitored various physiochemical properties of PM2.5across different regions in South Korea from January 1 to December 31, 2021. Specifically, the study area consisted of the city center, industrial complexes, and suburban areas. Before analyzing dynamics of emissions specific to each site, the Clean Air Policy Support System data for the three areas were compared to elucidate their respective primary emission sources. The particle concentrations for the three areas were 21.8–26.44 µg/m3, with the highest concentrations being observed in March. All the three areas exhibited high ratios of NO3−across all seasons. The particle number concentrations in the three sites were 1.3–1.5 × 107, and the peak points of the concentrations were different in every site: city center (40 nm), industrial complexes (60 nm), and suburban areas (80 nm). We also conducted potential source contribution function and conditional bivariate probability function analyses. These analyses were conducted to determine the inflow direction of the pollution sources for high PM2.5episodes. For the episodes that occurred in spring and winter, there were no differences in the PM2.5concentrations between the three sites. Overall, the insights gained from this study offer a framework for developing air-quality management policies in South Korea, specifically in the context of PM2.5emissions.

Published
2023
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32. Control of Neutrophil Endothelial Transmigration By EC-18 in Chemotherapy Induced Neutropenia

Author

Kim, Jae Wha, primary, Kim, Yong-Jae, additional, Kim, Young-Jun, additional, Yoon, Sun Young, additional, Jeong, Jinseon, additional, Ko, Young-Eun, additional, Shin, Su-Hyun, additional, Yoo, Nina, additional, Kim, Myung-Hwan, additional, Suh, Cheolwon, additional, Sohn, Ki-Young, additional, Kim, Heung-Jae, additional, Han, Yong-Hae, additional, and Chong, Saeho, additional

Published
2015
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