Search

Your search keyword '"Kim, S. -J"' showing total 3,392 results
Start Over Author "Kim, S. -J" Language english
3,392 results on '"Kim, S. -J"'

5. Aerosol deposition on face masks in an open environment during inhalation.

Author

Lee, Y. J., Moon, M. W., Chung, S., and Kim, S. J.

Subjects
VISCOUS flow, MEDICAL masks, AEROSOLS, AERODYNAMICS, DISPERSION (Chemistry)
Abstract

The aerodynamics of aerosols and their deposition on face masks play a critical role in determining the effectiveness of respiratory protection. While existing studies have focused on the risks associated with aerosol dispersion during exhalation, little attention has been paid to aerosol aerodynamics in an open environment, where aerosols can circumvent masks, during inhalation. This is because mask performance has primarily been evaluated by the particle filtration efficiency in closed pipe setups, which do not account for the aerodynamics of aerosols around the wearer's face. In this study, we conduct experiments in an open environment to investigate the aerosol flow around a face mask and the aerosol deposition under varying inhalation pressures. Our results indicate that an aerosol flow near a mask surface behaves like a viscous flow, stagnating within the range of human inhalation. Within this range, we find that the amount of aerosol deposited can be predicted by modifying existing aerodynamics theory. Using a theoretical model, a critical inhalation pressure is identified at which water aerosols begin to penetrate through a mask. Finally, we propose the aerosol circumvention efficiency as a new metric to assess mask performance in open environments by taking into account the effects of aerosol circumvention. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

8. Exploring the ambiguity of community in disaster risk reduction : a case study of Metro Manila

Author

Kim, S. J.

Subjects
363.34
Abstract

This study investigates the dialectical relationships between state-centred interventions and community-based actions in reducing disaster risks by focusing on everyday practices of the informal settlers living in ‘danger areas’. Past research has reduced the interactions between state and community by focusing on tensions between the two as top-down/bottom-up or knowledge/action. This research attempts to illustrate community-based disaster risk reduction as a process itself in which multiple and contingent paths emerge. To this aim, adopting Lefebvre’s production of space, this research elaborates on the concept of ‘space of risk’, which is distinguished from the term ‘danger areas’. Specifically, the term ‘danger areas’ is defined exclusively by law and is based on scientific knowledge and policy orientation; however, local communities directly involved in a series of disasters are relatively excluded in the construction of meanings. If an urban area is declared a ‘danger area’, the state has a legal basis to evict informal settlers living in that area. Those who determine a danger area have the power to dictate who has access to urban lands. Hence, in conceptualizing ‘space of risk’ as an analytical tool, this thesis highlights the roles of informal settlers in producing this space and, potentially, reproducing existing social relationships. This framework is used to address whether the state potentially depoliticizes community-based actions, how community involvement in disaster risk reduction can bring changes to the state mode of production, and under which conditions community-based actions can obtain political dimension. Empirical narratives are grounded in the city of Metro Manila, the Philippines. Guided by a qualitative case study methodology, fieldwork was conducted in three sites of low-income communities, facing a range of disaster risks. Whilst the government-led relocation plan increases the vulnerability of people and, as a result, depoliticizes community-based actions, the informal settlers living in ‘danger areas’ self-organize, initiate, and participate in disaster risk reduction activities. However, within a community that is disaggregated are sub-communities that develop and pursue their own agendas; especially, the most active participants of disaster risk reduction who negotiate with the governments for basic services or access to land ownership. Thus, when acknowledging different agendas, aspirations, and needs of each group, community-based actions can regain their political dimension.

Published
2015

13. Life in the UK.

Author

Kim, S J

Subjects
CULTURE
Abstract

A personal narrative is presented which explores the author's experiences, observations, and reflections on aspects of British culture, identity, and academia, delving into intimate details and emotions to offer insights into their journey and perspectives.

Published
2024
Full Text
View/download PDF

36. H-dibaryon search by KEK-E522 : Search for the ΛΛ resonance in 12C (K−, K+ΛΛX) using a scintillating fiber active target

Author

Yoon, C. J., Akikawa, H., Aoki, K., Fukao, Y., Funahashi, H., Hayata, M., Imai, K., Miwa, K., Okada, H., Saito, N., Sato, H. D., Shoji, K., Takahashi, H., Taketani, K., Asai, J., Kurosawa, M., Ieiri, M., Hayakawa, T., Kishimoto, T., Sato, A., Shimizu, Y., Yamamoto, K., Yoshida, T., Hibi, T., Nakazawa, K., Ahn, J. K., Choi, B. H., Kim, S. J., Kim, S. H., Park, B. D., Park, I. G., Song, J. S., Yoon, C. S., Tanida, K., Ohnishi, A., Pochodzalla, Josef, editor, and Walcher, Thomas, editor

Published
2007
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results