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1,150 results on '"Lee, Sung Woo"'

151. Multipacting Analysis of Warm Linac RF Vacuum Windows

Author

Toby, George, Kang, Yoon, Kim, Sang-Ho, Lee, Sung-Woo, and Moss, John

Subjects
MC7: Accelerator Technology, Accelerator Physics
Abstract

Multipacting in accelerating structures is a complex phenomenon with which there is much to be understood. While multipacting research efforts have primarily been focused on superconducting radio frequency (SRF) systems, normal conducting accelerating structures that have a higher thermal capacity and a greater vacuum pressure tolerance could benefit from additional investigation. This research details multipacting simulation methods and the results of 3-D electromagnetic simulations of RF vacuum windows used on normal conducting linac (NCL) cavities. Possible techniques for reducing and eliminating multipacting activities in these structures are discussed., Proceedings of the 12th International Particle Accelerator Conference, IPAC2021, Campinas, SP, Brazil

Published
2021
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152. The Spallation Neutron Source Normal Conducting Linac RF System Design for the Proton Power Upgrade Project

Author

Moss, John, Crofford, Mark, Lee, Sung-Woo, Middendorf, Mark, and Toby, George

Subjects
MC7: Accelerator Technology, Accelerator Physics
Abstract

The Proton Power Upgrade (PPU) project at the Spallation Neutron Source will double the available proton beam power from 1.4 to 2.8 MW by increasing the beam energy from 1.0 to 1.3 GeV and the beam current from 26 to 38 mA. The increase in beam current resulted in the need to redesign the existing normal conducting linac (NCL) RF Systems. High-power testing of the existing NCL RF Systems configured to accelerate PPU-level beam provided the data used to make the final design decisions. This paper describes the development and execution of those in-situ tests and the subsequent results., Proceedings of the 12th International Particle Accelerator Conference, IPAC2021, Campinas, SP, Brazil

Published
2021
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162. Risk of Chronic Kidney Disease Associated With Orthostatic Hypotensive Stress: A Community-Based Korean Study.

Author

Ko, Hyun-Lee, Min, Hyang-Ki, and Lee, Sung-Woo

Subjects
DISEASE risk factors, CHRONIC kidney failure, GLOMERULAR filtration rate, SUPINE position, BODY mass index
Abstract

Background The relationship between orthostatic blood pressure (BP) changes and incident chronic kidney disease (CKD) has not been explored in Asian populations. Methods We reviewed the data of 7,039 participants from the Ansung-Ansan cohort study. BP was measured in the supine position and 2 minutes after standing. The change in BP from the supine to upright position was defined as orthostatic BP change. Orthostatic systolic BP (SBP) decline was defined as an orthostatic SBP change of <−2 mm Hg. The primary outcome was the development of CKD, defined as the first event of an estimated glomerular filtration rate <60 ml/min/1.73 m2 at least twice during the follow-up period. Results Of 7,039 participants, 949 (13.5 %) developed incident CKD over a mean of 11.9 years. Although orthostatic diastolic BP change was not associated with incident CKD, every 1 mm Hg increase in orthostatic SBP change was associated with a decreased risk of incident CKD (HR, 0.989; 95% CI, 0.982–0.995; P = 0.001). Orthostatic SBP decline was associated with an increased risk of incident CKD (HR, 1.337; 95% CI, 1.163–1.537; P < 0.001). Older age and diabetes were associated with increased odds of orthostatic SBP decline, whereas male sex and high body mass index were associated with decreased odds of orthostatic SBP decline. Subgroup analysis revealed that orthostatic SBP decline was associated with incident CKD only in non-diabetic participants. Conclusions Orthostatic SBP decline was independently associated with an increased risk of future incident CKD, whereas orthostatic DBP decline was not. [ABSTRACT FROM AUTHOR]

Published
2022
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174. The Prevalence and Emergency Department Utilization of Patients Who Underwent Single and Double Inter-hospital Transfers in the Emergency Department: a Nationwide Population-based Study in Korea, 2016–2018

Author

Kim, Youn-Jung, primary, Hong, Jung Seok, additional, Hong, Seok-In, additional, Kim, June-Sung, additional, Seo, Dong-Woo, additional, Ahn, Ryeok, additional, Jeong, Jinwoo, additional, Lee, Sung Woo, additional, Moon, Sungwoo, additional, and Kim, Won Young, additional

Published
2021
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193. Effect of ambulatory blood pressure monitoring guided antihypertensive treatment on renal progression in patients with chronic kidney disease: a randomized comparative study

Author

Kim, Yunmi, primary, Kim, Jayoun, additional, Lee, Sung Woo, additional, Sung, Suah, additional, Yoo, Tae-Hyun, additional, Lee, Kyu-Beck, additional, Hwang, Young-Hwan, additional, Kim, Taehee, additional, Kang, Sun Woo, additional, Kim, Yeong Hoon, additional, and Oh, Kook-Hwan, additional

Published
2020
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