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531 results on '"Choi, Jae-Wook"'

22. Adsorbed oxygen atoms for improving the oxidative dehydrogenation of ethane over B-site-doped layered perovskite La2Ti2O7

Author

Thi Do, Lien, primary, Woong Cha, Hwa, additional, Eun, Jina, additional, Choi, Jae-Wook, additional, Jin Suh, Dong, additional, Yoo, Chun-Jae, additional, Lee, Hyunjoo, additional, Ho Kim, Kwang, additional, Soo Kim, Chang, additional, Kim, Kyeongsu, additional, Chul Ham, Hyung, additional, and Ha, Jeong-Myeong, additional

Published
2024
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24. A Study on the Relationship between Work-Related Health Problems and the Working Conditions of Electronics Industry Workers in South Korea.

Author

Won, Sul A., Choi, Jae Wook, and Kim, Kyung Hee

Subjects
INDUSTRIAL electronics, WORK environment, ELECTRONIC industries, LOGISTIC regression analysis, JOB satisfaction
Abstract

Background: The electronics industry has characteristics, such as the continuous occurrence of new hazards and risk factors due to rapid technological changes, the occurrence of safety and health blind spots due to the outsourcing of work, trade secrets, and a lack of information, so research is needed from a safety and health perspective. This study sought to determine the relationship between work-related health problems and the working conditions of electronics industry workers. Methods: The study subjects were 3354 workers in the electronics industry from the raw data of the 4th to 6th Korean Working Condition Survey (KWCS). The variables were divided into general, occupational, and working environment characteristics, and a logistic regression analysis was conducted to determine the relationship between work-related health problems and working conditions. Results: Among the general and occupational characteristics, gender, education, night work, and working time appropriateness were analyzed as effect factors. In terms of working environment characteristics, physical work risk, musculoskeletal work risk, possibility of risk to work, subjective health impact, and working environment satisfaction were found to have effects on work-related health problems. Conclusions: The results of this study are meaningful in that they identified the effect factors of work-related health problems in the working conditions of workers in the electronics industry, where prior studies are lacking. Therefore, improvements, such as the management of night workers, appropriate working time, reduction in exposure to work risk factors, and improvement in working environment satisfaction, appear to be necessary. [ABSTRACT FROM AUTHOR]

Published
2024
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25. Properties of low-resistivity molybdenum metal thin film deposited by atomic layer deposition using MoO2Cl2 as precursor.

Author

Kim, So Young, Jo, Chunghee, Shin, Hyerin, Yoon, Dongmin, Shin, Donghyuk, Cheon, Min-ho, Lee, Kyu-beom, Seo, Dong-won, Choi, Jae-wook, Park, Heungsoo, and Ko, Dae-Hong

Subjects
ATOMIC layer deposition, MOLYBDENUM, METALLIC films, THIN films, MOLYBDENUM nitrides, COPPER
Abstract

Challenges have arisen in selecting suitable candidates for interconnects and metal contacts due to the exponential increase in metal resistivity at scaled pitches. Molybdenum (Mo) has emerged as a promising alternative to the traditional metals such as copper or tungsten owing to its low electrical resistivity and electron mean free path. In this study, we investigated the formation of a molybdenum film grown by thermal atomic layer deposition (ALD) using a MoO2Cl2 solid precursor and H2 and NH3 gases as the reducing agents. A molybdenum nitride film served as the seed layer on a SiO2 substrate before molybdenum film deposition. The analysis focused on the film's phase, morphology, chemical bonding states, and resistivity across various thicknesses. X-ray diffraction (XRD) confirmed the presence of polycrystalline BCC planes. Our analyses confirmed the successful growth of the molybdenum metal thin film, which, at a thickness of 10 nm, exhibited a record-low resistivity of approximately 13 μΩ cm. [ABSTRACT FROM AUTHOR]

Published
2024
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31. Terahertz nano antenna enabled early transition in VO2

Author

Jeong, Young-Gyun, Kyoung, Ji-Soo, Choi, Jae-Wook, Han, Sang-Hoon, Park, Hyeong-Ryeol, Park, Namkyoo, Kim, Bong-Jun, Kim, Hyun-Tak, and Kim, Dai-Sik

Subjects
Physics - Optics, Condensed Matter - Materials Science
Abstract

We study terahertz transmission through nano-patterned vanadium dioxide thin film. It is found that the patterning allows the lowering of the apparent transition temperature. For the case of the smallest width nano antennas, the transition temperature is lower by as many as ten degrees relative to the bare film, so that the nano patterned hysteresis curves completely separate themselves from their bare film counterparts. This early transition comes from the one order of magnitude enhanced effective dielectric constants by nano antennas. This phenomenon opens up the possibility of transition temperature engineering.

Published
2012

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