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Prof. Seunghon Ham
Department of Occupational and Environmental Medicine, Gachon University Gil Medical Center, Incheon, Republic of Korea

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Journal article
Published: 01 January 2021 in Annals of Occupational and Environmental Medicine
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ACS Style

Junhyeong Lee; Ui-Jin Kim; YongHo Lee; Eunseun Han; Seunghon Ham; Wanhyung Lee; Won-Jun Choi; Seong-Kyu Kang. Sunlight exposure and eye disorders in an economically active population: data from the KNHANES 2008-2012. Annals of Occupational and Environmental Medicine 2021, 33, 1 .

AMA Style

Junhyeong Lee, Ui-Jin Kim, YongHo Lee, Eunseun Han, Seunghon Ham, Wanhyung Lee, Won-Jun Choi, Seong-Kyu Kang. Sunlight exposure and eye disorders in an economically active population: data from the KNHANES 2008-2012. Annals of Occupational and Environmental Medicine. 2021; 33 ():1.

Chicago/Turabian Style

Junhyeong Lee; Ui-Jin Kim; YongHo Lee; Eunseun Han; Seunghon Ham; Wanhyung Lee; Won-Jun Choi; Seong-Kyu Kang. 2021. "Sunlight exposure and eye disorders in an economically active population: data from the KNHANES 2008-2012." Annals of Occupational and Environmental Medicine 33, no. : 1.

Journal article
Published: 17 April 2020 in Epidemiology and Health
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ACS Style

Seunghon Ham. Prevention of exposure and dispersion of COVID-19 using air purifiers: challenges and concerns. Epidemiology and Health 2020, e2020027 .

AMA Style

Seunghon Ham. Prevention of exposure and dispersion of COVID-19 using air purifiers: challenges and concerns. Epidemiology and Health. 2020; ():e2020027.

Chicago/Turabian Style

Seunghon Ham. 2020. "Prevention of exposure and dispersion of COVID-19 using air purifiers: challenges and concerns." Epidemiology and Health , no. : e2020027.

Journal article
Published: 15 April 2020 in International Journal of Environmental Research and Public Health
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This study compared the association between working hours and self-rated health (SRH) according to sex, socioeconomic status, and working conditions. In all, 25,144 participants were selected from the Korea National Health and Nutrition Examination Survey (KNHANES), conducted from 2010 to 2018. The risks of poor SRH, according to working hours, were investigated using multiple logistic regression. Both short and long working hours were associated with poor SRH. Men working short hours and women working long hours were at risk of poor SRH. Workers with fewer than nine years of education were at risk of poor SRH when working short hours, whereas workers with more than nine years of education were at risk when working long hours. Similarly, simple laborers were at risk of poor SRH when working short hours, while managers and professional workers were at risk when working long hours. When working for short hours, paid employees were at risk of poor SRH. Workers with a non-fixed work schedule showed no risk of poor SRH when working long or short hours. In conclusion, workers working short hours with low education and workers working long hours with high education were at risk of poor SRH. Working conditions were significantly related to the association between SRH and working hours.

ACS Style

Jongha Jeon; Wanhyung Lee; Won-Jun Choi; Seunghon Ham; Seong-Kyu Kang. Association between Working Hours and Self-Rated Health. International Journal of Environmental Research and Public Health 2020, 17, 2736 .

AMA Style

Jongha Jeon, Wanhyung Lee, Won-Jun Choi, Seunghon Ham, Seong-Kyu Kang. Association between Working Hours and Self-Rated Health. International Journal of Environmental Research and Public Health. 2020; 17 (8):2736.

Chicago/Turabian Style

Jongha Jeon; Wanhyung Lee; Won-Jun Choi; Seunghon Ham; Seong-Kyu Kang. 2020. "Association between Working Hours and Self-Rated Health." International Journal of Environmental Research and Public Health 17, no. 8: 2736.

Journal article
Published: 01 January 2020 in Annals of Occupational and Environmental Medicine
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The number of workers in non-standard employment (NSE) is increasing due to industrial change and technological development. Dependent self-employment (DSE), a type of NSE, was created decades ago. Despite the problems associated with this new type of employment, few studies have been conducted on the effects by DSE on health, especially sleep quality. This study aims to determine the relationship between DSE and sleep quality. This study analyzed data of 50,250 wage workers from the fifth Korean Working Conditions Survey. Workers that did not respond or refused to answer any questions related to variables were excluded, and finally 36,709 participants were included in this study. A total of 2,287 workers (6.2%) were compared with non-DSE (34,422; 93.8%) workers, and multiple logistic regression analyses were applied. DSE status had a significant association with difficulty falling asleep (odds ratio [OR]: 1.331, 95% confidence interval [CI]: 1.178-1.504), difficulty maintaining sleep (OR: 1.279; 95% CI: 1.125-1.455), and extreme fatigue after waking up (OR: 1.331; 95% CI: 1.184-1.496). A multiple logistic regression of the variables for sleep quality in DSE showed a significant association with exposure to physical factors for all types of poor sleep quality as well as shift work for difficulty maintaining sleep with extreme fatigue after waking up. Long working hours and emotional labor were also associated with extreme fatigue after waking up. This study shows a significant association between DSE and poor sleep quality, especially when workers were exposed to physical risk factors (noise, vibration, abnormal temperature, etc.) and shift work.

ACS Style

Sang Ha Lee; Dukyun Kang; Junhyeong Lee; Uijin Kim; Seunghon Ham; Wanhyung Lee; Won-Jun Choi; Seong-Kyu Kang. Multidimensional sleep quality of dependent self-employment workers. Annals of Occupational and Environmental Medicine 2020, 32, e6 .

AMA Style

Sang Ha Lee, Dukyun Kang, Junhyeong Lee, Uijin Kim, Seunghon Ham, Wanhyung Lee, Won-Jun Choi, Seong-Kyu Kang. Multidimensional sleep quality of dependent self-employment workers. Annals of Occupational and Environmental Medicine. 2020; 32 (1):e6.

Chicago/Turabian Style

Sang Ha Lee; Dukyun Kang; Junhyeong Lee; Uijin Kim; Seunghon Ham; Wanhyung Lee; Won-Jun Choi; Seong-Kyu Kang. 2020. "Multidimensional sleep quality of dependent self-employment workers." Annals of Occupational and Environmental Medicine 32, no. 1: e6.

Journal article
Published: 06 December 2019 in International Journal of Environmental Research and Public Health
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Exposure to extreme temperature is a critical occupational risk factor. This study aimed to investigate the association between exposure to extreme temperatures and injury at the workplace using data from 92,238 workers (46,175 male and 46,063 female) from the 2014 and 2017 Korean Working Condition Survey. Exposure to extremely high or low temperatures, injury experiences, and personal protective equipment (PPE) wearing behavior were investigated using a questionnaire. Logistic regression analyses were performed to investigate the association between exposure to extreme temperature and injury experience. The association between injury experience and PPE wearing behavior was analyzed for each exposure group. After adjusting for individual and occupational factors, the odds ratios (ORs) for injury experience were 2.06 (95% confidence interval (CI): 1.78–2.38) and 1.64 (95% CI: 1.44–1.85) in both high and low temperature exposure groups, respectively, and 1.45 (95% CI: 1.15–1.83) for those not wearing PPE when exposed to high temperature. There was no significant association shown with wearing PPE and injury experience in the low temperature exposure group. Exposure to extreme temperature tended to increase the risk of injury, and was higher in workers not wearing PPE in high temperature. PPE that can be worn comfortably in high temperature is needed to prevent occupational injury.

ACS Style

Junhyeong Lee; Wanhyung Lee; Won-Jun Choi; Seong-Kyu Kang; Seunghon Ham. Association between Exposure to Extreme Temperature and Injury at the Workplace. International Journal of Environmental Research and Public Health 2019, 16, 4955 .

AMA Style

Junhyeong Lee, Wanhyung Lee, Won-Jun Choi, Seong-Kyu Kang, Seunghon Ham. Association between Exposure to Extreme Temperature and Injury at the Workplace. International Journal of Environmental Research and Public Health. 2019; 16 (24):4955.

Chicago/Turabian Style

Junhyeong Lee; Wanhyung Lee; Won-Jun Choi; Seong-Kyu Kang; Seunghon Ham. 2019. "Association between Exposure to Extreme Temperature and Injury at the Workplace." International Journal of Environmental Research and Public Health 16, no. 24: 4955.

Journal article
Published: 15 November 2019 in Sustainability
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This study aimed to compare sample pretreatment procedures for the identification and quantification of asbestos. The performance of visual estimation and point counting procedures for evaluating asbestos-containing waste was investigated, and the effect of analytical experience was studied. The efficacy of pretreatments for the identification and quantification of asbestos in various sample matrices was compared. To evaluate the effect of experience on analytical accuracy, three analysts with different analytical experiences were selected. There were significant differences in the quantitative analysis results obtained using different pretreatments. False negatives were reported when asbestos, especially amphiboles, were analyzed by a less-experienced analyst. Quantification via point counting and visual estimation resulted in differences in the asbestos content. The results of point counting were more accurate than those of visual estimation for all analysts, regardless of the asbestos type and concentration. Experience in asbestos analysis affected accuracy and precision. The findings show that pretreatment is an important factor in qualitative analysis. Appropriate pretreatments should be assigned based on the properties of the sample. For quantitative analysis, the accuracy of the results depends on the experience of the analyst. Until analysts are fully trained, all their analysis results should be checked by an experienced analyst. Point counting is an adequate quantitative method for analyzing samples with low concentrations.

ACS Style

Seunghon Ham; Sungho Hwang; ChungSik Yoon. Comparison of Methods for Pretreatment and Quantification of Bulk Asbestos Samples for Polarized Light Microscopy Analysis to Evaluate Asbestos-Containing Waste. Sustainability 2019, 11, 6440 .

AMA Style

Seunghon Ham, Sungho Hwang, ChungSik Yoon. Comparison of Methods for Pretreatment and Quantification of Bulk Asbestos Samples for Polarized Light Microscopy Analysis to Evaluate Asbestos-Containing Waste. Sustainability. 2019; 11 (22):6440.

Chicago/Turabian Style

Seunghon Ham; Sungho Hwang; ChungSik Yoon. 2019. "Comparison of Methods for Pretreatment and Quantification of Bulk Asbestos Samples for Polarized Light Microscopy Analysis to Evaluate Asbestos-Containing Waste." Sustainability 11, no. 22: 6440.

Communication
Published: 12 November 2019 in Sustainability
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Firefighters are known to be exposed to a variety of hazardous materials and combustion products during operational and training activities, as well as in fire stations. However, exposure to diesel exhaust emissions, classified as carcinogenic to humans by the International Agency for Research on Cancer (IARC), is also present in the fire station environment. In this study, concentrations of elemental carbon (EC), which is a surrogate of diesel exhaust and indoor air pollutants, has been measured to compare the effect of an exhaust reduction system (ERS) that was installed in the engine bays of two fire stations to mitigate indoor air pollution levels in the garage, duty offices, and dormitory/shower areas. The levels of most pollutants were reduced after the installation of the ERS. Pollutants may disperse inside of fire stations. Therefore, the ERS is a valuable strategy to mitigate pollutant exposure among firefighters and outdoor air pollution using the filtration ability of an ERS. The results of this study suggest that all truck bays should install an ERS to reduce pollutant exposure and that installation is especially necessary for EURO 3 fire vehicles.

ACS Style

Soo Jin Kim; Jihyun Kang; Seunghon Ham. Evaluation of the Effect of an Exhaust Reduction System in Fire Stations. Sustainability 2019, 11, 6358 .

AMA Style

Soo Jin Kim, Jihyun Kang, Seunghon Ham. Evaluation of the Effect of an Exhaust Reduction System in Fire Stations. Sustainability. 2019; 11 (22):6358.

Chicago/Turabian Style

Soo Jin Kim; Jihyun Kang; Seunghon Ham. 2019. "Evaluation of the Effect of an Exhaust Reduction System in Fire Stations." Sustainability 11, no. 22: 6358.

Journal article
Published: 01 January 2019 in Journal of Korean Medical Science
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Mental health problems are a growing issue among customer-facing workers. This study aimed to investigate the workers' symptoms of anxiety, depression, and sleep disturbance caused by customer complaints and the suppression of one's emotions at work. This study used the data from the fifth Korean Working Conditions Survey 2017 database. The subjects comprised 23,128 workers (men, 11,007; women, 12,121). The odds ratios (ORs) and 95% confidence intervals (CIs) were calculated using multiple logistic regression models, to determine the effect of the exposure level of engaging with angry clients and suppressing one's emotions at work on mental health. Among the workers engaging with angry customers, compared to the "Rarely" group as a reference point, the "Always" group showed elevated OR values (at [95% CI]) of 1.52 (1.10-2.10), 1.86 (1.05-3.27), 4.43 (3.11-6.33), 3.74 (2.51-5.55), 3.89 (2.65-5.70) for men workers; and 2.86 (1.94-4.22), 2.55 (1.73-3.75), 3.75 (2.82-4.98), 3.81 (2.84-5.09), 3.84 (2.88-5.12) for women workers, for depression, anxiety, difficulty falling asleep, waking up during sleep, and extreme fatigue after waking up, respectively. For suppressing one's emotions at work, the OR values of the "Always" group were 2.32 (1.53-3.51), 2.46 (1.73-3.50), 2.54 (1.88-3.43), 2.64 (1.92-3.64), 2.42 (1.81-3.24) for men workers; and 2.23 (1.53-3.25), 2.31 (1.61-3.33), 2.26 (1.72-2.96), 1.53 (1.19-1.97), 2.15 (1.62-2.85) for women workers, for depression, anxiety, and difficulty falling asleep, waking up during sleep, and extreme fatigue after waking up, respectively. The emotional labor demanded from customer-facing workers, incurred by facing customer complaints and suppressing one's emotions at work, was found to be significantly associated with the development of depression, anxiety, and sleep disturbance symptoms among the Korean working population.

ACS Style

Dukyun Kang; Jae Won Yang; Won-Jun Choi; Seunghon Ham; Seong-Kyu Kang; Wanhyung Lee. Anxiety, Depression and Sleep Disturbance among Customer-Facing Workers. Journal of Korean Medical Science 2019, 34, e313 .

AMA Style

Dukyun Kang, Jae Won Yang, Won-Jun Choi, Seunghon Ham, Seong-Kyu Kang, Wanhyung Lee. Anxiety, Depression and Sleep Disturbance among Customer-Facing Workers. Journal of Korean Medical Science. 2019; 34 (48):e313.

Chicago/Turabian Style

Dukyun Kang; Jae Won Yang; Won-Jun Choi; Seunghon Ham; Seong-Kyu Kang; Wanhyung Lee. 2019. "Anxiety, Depression and Sleep Disturbance among Customer-Facing Workers." Journal of Korean Medical Science 34, no. 48: e313.

Journal article
Published: 02 October 2018 in International Journal of Occupational and Environmental Health
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ACS Style

SunJu Kim; ChungSik Yoon; Seunghon Ham; Jihoon Park; Ohun Kwon; Nguk Park; Sangjun Choi; Seungwon Kim; Kwonchul Ha; Won Kim. Chemical use in the semiconductor manufacturing industry. International Journal of Occupational and Environmental Health 2018, 24, 109 -118.

AMA Style

SunJu Kim, ChungSik Yoon, Seunghon Ham, Jihoon Park, Ohun Kwon, Nguk Park, Sangjun Choi, Seungwon Kim, Kwonchul Ha, Won Kim. Chemical use in the semiconductor manufacturing industry. International Journal of Occupational and Environmental Health. 2018; 24 (3-4):109-118.

Chicago/Turabian Style

SunJu Kim; ChungSik Yoon; Seunghon Ham; Jihoon Park; Ohun Kwon; Nguk Park; Sangjun Choi; Seungwon Kim; Kwonchul Ha; Won Kim. 2018. "Chemical use in the semiconductor manufacturing industry." International Journal of Occupational and Environmental Health 24, no. 3-4: 109-118.