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Sung-Shil Lim,Jihyun Kim,Seahee Yune,Jin-Ha Yoon 대한직업환경의학회 2019 대한직업환경의학회지 Vol.31 No.-
Background: The balance between self- and social identity on job value of Korean dance artists, considered as performing artists, was measured to investigate the relationship between balance and depressive symptoms. Methods: Data of 139 dance artists were analyzed for depressive symptoms assessed by their responses to questionnaires from the Center for Epidemiologic Studies Depression (CESD) translated into Korean. The balance score of each aspect of social identity compared to that of self-identity on job value was measured and classified as lower, equal, or higher. Following a graphical approach, we performed locally weighted scatterplot smoothing algorithm, simple linear regression, and quadric equation regression. Results: The mean of CESD was highest in the higher balance group and lowest in the lower balance group. There was a linear relationship between balance score and CESD regarding specific audience, unspecified audience, and unspecified public. Balance score showed no association with other aspects of social identity. In the balance score range of 1 or higher, it was associated with CESD with respect to artist colleague, unspecified audience, and unspecified public. Conclusions: Dance artists should maintain a balance between self- and social identity in job value to prevent depressive symptoms.
Sehyun Yun,Sung-Shil Lim,Jihyun Kim,Young-Kwang Kim,Jong-Uk Won,Jin-Ha Yoon 대한직업환경의학회 2019 대한직업환경의학회지 Vol.31 No.-
Background: We aim to discuss the overall effect of customer service manual (CSM) on service industry workers using Korean Working Condition Survey. Methods: Out of 50,007 total survey participants, 11,946 customer service workers were included in the current study (5613 men, 6333 women). Answers to survey questions were used to define the use of CSM, emotional burden, emotional dissonance, engaging angry customers and other covariates. Emotional burden included either depressive event or stress level. Odds ratio (OR) with 95% confidence interval (95% CI) of experiencing emotional burden was calculated by logistic regression model. Interaction effect between CSM and engaging angry customer on emotional burden was also estimated. Results: Out of 11,946 subjects, total of 3279 (27.4%) have experienced emotional burden. OR (95% CI) of experiencing emotional burden was 1.40 (1.19–1.64) in men and 1.25 (1.09–1.44) in women. There was gender difference in interaction effect between the use of CSM and engaging angry customers. In men, OR (95% CI) was 3.16 (1.38–7.23) with additive effect when always engaging angry customers with CSM compared to rarely engaging without CSM, while in women OR (95% CI) was 8.85 (3.96–19.75) with synergistic effect. Moreover, the risk of depressive event increased only in women with OR (95% CI) 2.22 (1.42–3.48). Conclusions: Our current study highlighted association between emotional burden and CSM in both men and women service workers. Furthermore, women were affected more severely by CSM. The results from current study suggest that CSM should be changed appropriately to benefit workers.
한국산 메밀, 수수, 기장, 율무의 항산화효과 및 돌연변이억제효과
곽충실(Chung Shil Kwak),임수진(Soo Jin Lim),김성애(Sung Ae Kim),박상철(Sang Chul Park),이미숙(Mee Sook Lee) 한국식품영양과학회 2004 한국식품영양과학회지 Vol.33 No.6
한국산 메밀, 수수, 기장, 율무의 돌연변이억제효과와 항산화효과 및 총 flavonoid와 polyphenol 함량을 측정하였다. 이를 위하여 에탄올 추출시료를 얻은 후 Ames test 방법으로 돌연변이 억제효과를 검색하였고, Fe2+로 유도된 지질과 산화 억제율, DPPH 라디칼 소거율 및 MDA-BSA 결합억제율을 측정하는 3가지 방법으로 항산화효과를 검정하고, 총 flavonoid와 polyphenol 함량을 측정한 결과를 요약하면 다음과 같다. 에탄올 추출시료의 IC_(50)에 의한 지질과산화 억제효과를 비교한 결과 메밀(0.174 mg/ assay), 수수(0.241 mg/assay), 율무(1.891 mg/assay), 기장(2.873 mg/assay) 순이었으며 에탄올 추출시료의 IC_(50)을 계산하여 DPPH 라디칼 제거능을 비교한 결과 메밀(0.264 mg/assay), 수수(2.135 mg/assay), 기장(2.902 mg/assay), 율무(4.667 mg/assay) 순이었다. 지질과산화물-단백질 결합 억제효과는 에탄올 추출시료의 IC_(50)을 기준으로 비교한 결과 메밀(3.73 mg/assay), 율무(51.82 mg/assay), 기장(120.59 mg/assay), 수수(449.43 mg/assay)의 순이었다. S. Typhimurium TA98에서 에탄올 추출물 4.5 mg/assay농도에서 2-Nitrofluorene에 의한 직접 돌연변이를 저해하는 비율은 수수(50.2%), 기장(20.3%), 메밀(18.5%), 율무(17.5%)의 순이었으며, S. Typhimurium TA100에서 sodium azide에 의한 직접돌연변이를 저해하는 비율은 기장(100%), 율무(78.6%), 수수(23.7%), 메밀(10.1%)의 순이었다. S. Typhimurium TA98 또는 TA100에서 에탄올 추출물이 2-Anthramine에 의한 간접돌연변이 억제효과는 기장, 수수, 율무, 메밀 모두 우수하였으며, 특히 기장과 수수의 효과가 매우 좋았다. 총 flavonoid 함량은 메밀(1.41 mg/g), 수수(1.17 mg/ g), 기장(0.96 mg/g), 율무(0.66 mg/g) 순이었고, 총 polyphenol 함량은 메밀(3.71 mg/g), 수수(1.76 mg/g), 율무(1.7 mg/g), 기장(1.09 mg/g) 순으로 각각 DPPH 라디칼제거효과 및 지질과산화억제효과의 순과 일치하였다. 총 flavonoid 함량은 DPPH 라디칼 제거효과에 대한 IC_(50) 값과 높은 상관관계(r=-0.9924, p<0.01)를 나타내었다. Dietary intake of whole grains, vegetable and fruit is known to reduce the degenerative chronic diseases, such as cancer and cardiovascular diseases. Antioxidative and antimutagenic effects of the ethanol extract of Korean Millet, Buckwheat, Sorghum and Job's tears were examined by inhibition against iron-induced linoleate peroxidation, DPPH (1,1-diphenyl-2-picrylhydrazyl) radical generation and MDA-BSA (malondialdehyde-bovine serum albumin) conjugation, and Ames test using Salmonella. Buckwheat showed the strongest antioxidative effect in three different systems among these four grains, but it showed the lowest antimutagenic effect. Sorghum was the second to Buckwheat in iron-induced linoleate peroxidation inhibition activity and DPPH radical scavenging activity, and showed very good direct-antimutagenic effect in 2-Nitrofluorene treated Salmonella Typhimurium TA98 and indirect-antimutagenic effect in 2-Anthramine treated Salmonella Typhimurium TA98 and TA100 with hepatic S9 mixture. Millet showed the strongest antimutagenic effect in Salmonella Typhimurium TA98 and TA100 with or without S9. Buckwheat contained the highest total flavonoids and polyphenols, 1.14 mg/g and 3.71 mg/g, respectively. Total flavonoid content in these four grains was negatively correlated with IC_(50) for DPPH radical scavenging antioxidative effect significantly (r=-0.9924, p=0.0076), but not with antimutagenic effect.
Kim, Soojin,Kim, Yangwook,Lim, Sung-Shil,Ryoo, Jae-Hong,Yoon, Jin-Ha Occupational Safety and Health Research Institute 2019 Safety and health at work Vol.10 No.4
Background: There is a lack of statistical analysis investigating the relationship between sleep problems and commute time in Korea. We aimed to analyze the association between representative health symptoms, sleep disturbances, and commute time according to working hours in Korea. Methods: The 4th Korean Working Conditions Survey data were used for analysis, and unpaid family workers and workers who work fewer than three days in a week were excluded. Commute time, working hours, and sleep hours were assessed using self-reported questionnaires. Odds ratios (ORs) with 95% confidence intervals (CIs) for sleep problems were calculated using a multivariate logistic regression model with ≤10 min commute time as the reference group. Results: Among a total of 28,804 workers (men = 14,945, women = 13,859), 2.6% of men and 3.2% of women experienced sleep problems. In both sexes, long commute time (51-60 minutes and >60 minutes) showed an increased OR [men, 2.03 (CI = 1.32-3.13) and 2.05 (CI = 1.33-3.17); women, 1.58 (CI = 1.05-2.39) and 1.63 (CI = 1.06-2.50), respectively]. In stratification analysis of working hours, long commute time (51-60 and > 60 minutes) showed an increased OR in men working >40 hours/week [2.08 (CI = 1.16-3.71) and 1.92 (CI = 1.08-3.41), respectively]. Furthermore, long commute time (41-50, 51-60, and >60 minutes) showed an increased OR in women working >40 hours/week [2.40 (CI = 1.27-4.55), 2.28 (CI = 1.25-4.16), and 2.19 (CI = 1.17-4.16), respectively]. Moreover, commute time >60 minutes showed an increased OR in women working ≤40 hours/week [1.96 (CI = 1.06-3.62)]. Conclusion: This large cross-sectional study highlights that long commute time is related to sleep problems in both sexes. Shorter commute times and decreased working hours are needed to prevent sleep problems in workers.
Seong-Uk Baek,Sung-Shil Lim,Sehyun Yun,Won-Tae Lee,Min-Seok Kim,Jin-Ha Yoon,Jong-Uk Won 대한직업환경의학회 2022 대한직업환경의학회지 Vol.34 No.-
Background: Recently, there has been a call to improve the holistic welfare of dependent contractors (DCs). Thus, our study examined the relationship between DCs and mental health symptoms and how this relationship was modified by age, sex, and income status of workers. Methods: A total of 27,980 workers from the Fifth Korean Working Conditions Survey are included in our study. The participants who reported having depression or anxiety over the last 12 months are defined those who had mental health symptoms. We performed exact matching for age group and sex, followed by conditional logistic regression with survey weights. Finally, stratified analyses by age, sex and income level were conducted. Results: DCs were found to be at increased risk of depression/anxiety compared to other workers. The odds ratio (OR) is 1.52 (95% confidence interval [CI]: 1.06–2.17). In the stratified analyses, vulnerable groups were middle-aged (OR [95% CI]: 1.68 [1.10–2.54]), female (OR [95% CI]: 1.85 [1.20–2.84]), and low-income (OR [95% CI]: 3.18 [1.77–5.73]) workers. Conclusions: Our study’s results reinforce those of other studies that show that DCs are at greater risk of experiencing mental health issues than other workers and that and this risk is greater for middle-aged, female, and low-income workers. These results suggest that appropriate policy efforts should be made to improve the psychological well-being of DCs.