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1,307 results on '"Lee, Sangyoon"'

1. In Search of a Data Transformation That Accelerates Neural Field Training

Author

Seo, Junwon, Lee, Sangyoon, Kim, Kwang In, and Lee, Jaeho

Subjects
Computer Science - Machine Learning, Computer Science - Computer Vision and Pattern Recognition
Abstract

Neural field is an emerging paradigm in data representation that trains a neural network to approximate the given signal. A key obstacle that prevents its widespread adoption is the encoding speed-generating neural fields requires an overfitting of a neural network, which can take a significant number of SGD steps to reach the desired fidelity level. In this paper, we delve into the impacts of data transformations on the speed of neural field training, specifically focusing on how permuting pixel locations affect the convergence speed of SGD. Counterintuitively, we find that randomly permuting the pixel locations can considerably accelerate the training. To explain this phenomenon, we examine the neural field training through the lens of PSNR curves, loss landscapes, and error patterns. Our analyses suggest that the random pixel permutations remove the easy-to-fit patterns, which facilitate easy optimization in the early stage but hinder capturing fine details of the signal., Comment: CVPR 2024

Published
2023

2. A Realistic Talking Human Embodied Agent Mobile Phone Intervention to Promote HIV Medication Adherence and Retention in Care in Young HIV-Positive African American Men Who Have Sex With Men: Qualitative Study

Author

Dworkin, Mark, Chakraborty, Apurba, Lee, Sangyoon, Monahan, Colleen, Hightow-Weidman, Lisa, Garofalo, Robert, Qato, Dima, and Jimenez, Antonio

Subjects
Information technology, T58.5-58.64, Public aspects of medicine, RA1-1270
Abstract

BackgroundAvatars and embodied agents are a promising innovation for human health intervention because they may serve as a relational agent that might augment user engagement in a behavioral change intervention and motivate behavioral change such as antiretroviral adherence and retention in care. ObjectiveThis study aimed to develop a theory-driven talking avatar-like embodied agent mobile phone intervention guided by the information-motivation-behavioral skills model to promote HIV medication adherence and retention in care in young African American men who have sex with men (MSM). MethodsWe performed 5 iterative focus groups in Chicago with HIV-positive African American MSM aged 18-34 years to inform the ongoing development of a mobile phone app. Participants for the focus groups were recruited from 4 University of Illinois at Chicago Community Outreach Intervention Project sites located in different high HIV incidence areas of the city and the University of Illinois at Chicago HIV clinic using fliers and word of mouth. The focus group data analysis included developing an ongoing list of priorities for app changes and discussion between two of the investigators based on the project timeline, resources, and to what extent they served the app’s objectives. ResultsIn this study, 16 men participated, including 3 who participated in two groups. The acceptability for an embodied agent app was universal in all 5 focus groups. The app included the embodied agent response to questions and antiretroviral regimen information, adherence tracking, CD4 count and viral load tracking, motivational spoken messages, and customizability. Concerns that were identified and responded to in the development process included privacy, stigma, avoiding the harsh or commanding tone of voice, avoiding negative motivational statements, and making reminder functions for a variety of health care interactions. ConclusionsAn avatar-like embodied agent mHealth approach was acceptable to young HIV-positive African American MSM. Its relational nature may make it an effective method of informing, motivating, and promoting health behavioral skills. Furthermore, the app’s ease of access, stigma-free environment, and audiovisual format may help overcome some adherence barriers reported in this population.

Published
2018
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7. Prevalence of family history of cancer in the NC-CCAPH consortium of Japan

Author

Abe, Sarah Krull, Ihira, Hikaru, Minami, Tetsuji, Imatoh, Takuya, Inoue, Yosuke, Tsutsumimoto, Kota, Kobayashi, Nozomu, Kashima, Rena, Konishi, Maki, Doi, Takehiko, Teramoto, Masayuki, Kabe, Isamu, Lee, Sangyoon, Watanabe, Makoto, Dohi, Seitaro, Sakai, Yukie, Nishita, Yukiko, Morisaki, Naho, Tachimori, Hisateru, Kokubo, Yoshihiro, Yamaji, Taiki, Shimada, Hiroyuki, Mizoue, Tetsuya, Sawada, Norie, Tsugane, Shoichiro, Iwasaki, Motoki, and Inoue, Manami

Published
2023
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15. CT Kernel Conversion Using Multi-domain Image-to-Image Translation with Generator-Guided Contrastive Learning

Author

Choi, Changyong, Jeong, Jiheon, Lee, Sangyoon, Lee, Sang Min, Kim, Namkug, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Greenspan, Hayit, editor, Madabhushi, Anant, editor, Mousavi, Parvin, editor, Salcudean, Septimiu, editor, Duncan, James, editor, Syeda-Mahmood, Tanveer, editor, and Taylor, Russell, editor

Published
2023
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27. Diversity in productive activities enhances life satisfaction among Japanese community-dwelling older adults: A cross-sectional study

Author

Fujii, Kazuya, primary, Lee, Sangyoon, additional, Katayama, Osamu, additional, Makino, Keitaro, additional, Harada, Kenji, additional, Tomida, Kouki, additional, Morikawa, Masanori, additional, Yamaguchi, Ryo, additional, Nishijima, Chiharu, additional, Misu, Yuka, additional, and Shimada, Hiroyuki, additional

Published
2024
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41. Isotemporal Substitution of Sedentary Behavior With Moderate to Vigorous Physical Activity Is Associated With Lower Risk of Disability: A Prospective Longitudinal Cohort Study

Author

Chiba, Ippei, Lee, Sangyoon, Bae, Seongryu, Makino, Keitaro, Shinkai, Yohei, Katayama, Osamu, Harada, Kenji, Yamashiro, Yukari, Takayanagi, Naoto, and Shimada, Hiroyuki

Subjects
Aged -- Health aspects -- Physiological aspects, Sedentary behavior -- Health aspects, Chronic diseases -- Risk factors -- Diagnosis, Physical fitness -- Health aspects, Health
Abstract

Objective. The purpose of the study was to estimate, using an isotemporal substitution model, the effect of replacing sedentary behavior (SB) with physical activity on the incidence of disability in community-dwelling older adults. Methods. This 2-year longitudinal cohort study enrolled 3691 community-dwelling older adults (57.2% women; mean age = 74.0 [SD = 5.0] years). Individuals with dementia, stroke, Parkinson disease, depression, low Mini-Mental State Examination scores, dependence on basic activities of daily living, and missing data were excluded. Physical activity and potential confounding factors were investigated as a baseline survey of disability incidence, defined by Japanese long-term care insurance certification, for 2 years in 2 regions. Physical activity data (SB, light-intensity physical activity, and moderateto vigorous-intensity physical activity [MVPA]) were measured using triaxial accelerometers for 14 days, and daily mean time spent in each physical activity parameter was computed in increments of 10 minutes. The relationship between baseline physical activity and disability incidence adjusted for potential confounders was analyzed using multilevel Cox proportional hazards regression analyses with an isotemporal substitution model. Results. The disability incidence rate was 3.8%, excluding individuals who could not be followed-up. Replacing 10 minutes of SB per day with MVPA was associated with a decreased disability incidence (hazard ratio = 0.870; 95% CI = 0.766-0.988), whereas no evidence was found for replacing SB with light-intensity physical activity (hazard ratio = 0.980; 95% CI = 0.873-1.10). Conclusions. Replacing SB with MVPA was associated with a lower risk of disability. These findings are helpful for establishing disability prevention strategies. Impact. These results suggest that feasible changes in daily behavior, such as replacing 10 minutes of SB with MVPA daily, might have a protective effect on disability incidence. Clarifying these associations is useful for developing disability prevention strategies and may help reduce the incidence of disability in community-dwelling older adults. Keywords: Epidemiology, Geriatrics, Physical Disability, Introduction Physical inactivity is prevalent worldwide and is a significant risk factor for noncommunicable diseases. (1) Physical inactivity is associated with a higher risk of mortality, poor quality of life, [...]

Published
2022
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46. Japan‐Multimodal Intervention Trial for the Prevention of Dementia: A randomized controlled trial.

Author

Sakurai, Takashi, Sugimoto, Taiki, Akatsu, Hiroyasu, Doi, Takehiko, Fujiwara, Yoshinori, Hirakawa, Akihiro, Kinoshita, Fumie, Kuzuya, Masafumi, Lee, Sangyoon, Matsumoto, Nanae, Matsuo, Koichiro, Michikawa, Makoto, Nakamura, Akinori, Ogawa, Susumu, Otsuka, Rei, Sato, Kenji, Shimada, Hiroyuki, Suzuki, Hiroko, Suzuki, Hiroyuki, and Takechi, Hajime

Published
2024
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47. Association between Hearing Aid Use and Cognitive Function in Persons with Hearing Impairment Stratified by Cardiovascular Risk.

Author

Tomida, Kouki, Lee, Sangyoon, Makino, Keitaro, Katayama, Osamu, Harada, Kenji, Morikawa, Masanori, Yamaguchi, Ryo, Nishijima, Chiharu, Fujii, Kazuya, Misu, Yuka, and Shimada, Hiroyuki

Subjects
*HEARING aids, *HEARING disorders, *CARDIOVASCULAR diseases risk factors, *COGNITIVE ability, *LOGISTIC regression analysis, *HEARING levels
Abstract

The purpose of this study was to conduct a cross-sectional analysis of the association between hearing aid use and cognitive decline in community-dwelling older adults with hearing impairment, stratified by cardiovascular risk level. This cross-sectional study covers 1857 hearing-impaired individuals selected among 10,674 community-dwelling older adults (≥65 years of age) in Japan. We investigate the association between hearing aid use and cognitive decline stratified by cardiovascular risk level, by assessing self-reported hearing impairment and hearing aid use, absolute cardiovascular risk, cognitive function, and potential confounding factors. The association between hearing impairment severity and increased cardiovascular risk, and the benefit of hearing aid use in preventing cognitive decline, were examined in a binomial logistic regression analysis, with the presence of cognitive decline as the objective variable. In the low cardiovascular risk group, hearing aid users had a lower odds ratio for decline in executive function than non-users (odds ratio = 0.61, 95% confidence interval: 0.39–0.98). However, there was no significant association between hearing aid use and cognitive decline in the high cardiovascular risk group (p > 0.05). Among older adults with hearing impairment, hearing aid use was associated with the maintenance of executive function in individuals of low cardiovascular risk. [ABSTRACT FROM AUTHOR]

Published
2024
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