Satisfaction with life and the risk of occupational injury

Sung-Min Park,Hwan-Cheol Kim,Shin-Goo Park,Hyun-Suk Jang,Go Choi,Jong-Han Leem 대한직업환경의학회 2018 대한직업환경의학회지 Vol.30 No.-

Background: Occupational injuries increase burden on society as well as personal health. Low satisfaction with life may not only increases the risk of occupational injuries directly, but also influences other factors that increase the risk of occupational injury. Along with previous studies on the risk of occupational injury, we sought to explore the relationship between satisfaction with life and occupational injury. Methods: The study participants were 6234workers health screened at a university hospital in Incheon. Information on occupational injury and satisfaction with life scale (SWLS) was obtained in a self-report format. Participants were allocated to one of four SWLS groups; the dissatisfied group, the slightly dissatisfied group, the slightly satisfied group, and the satisfied group. The analysis was performed using the chi-square test primarily and by logistic regression adjusted for potential confounders. Results: In men, the un-adjusted and adjusted odds ratios (ORs) of low satisfaction with life (SWLS< 20) were 1.98(CI1.55–2.53) and 1.81(CI 1.41–2.32), respectively. When the SWLS were divided into four groups, the adjusted ORs of the slightly satisfied (20–25), slightly dissatisfied(15–19), and dissatisfied(≤14) groups were 1.21, 1.72, and 2.70, respectively. That is ORs tended to increase linearly with decreasing SWLS score (p for trend < 0.001). In women, this relation was of borderline significance at best. When subjects were dichotomized based on SWLS scores, for males, the cured and adjusted RRs of occupational injury in the low satisfaction with life group were1.91 (95% CI: 1.50–2.42) and 1.66 (95% CI: 1.30–2.13), and for females, the adjusted-RR was marginally significant (1.67; 95% CI: 0.93–2.99). When subjects were divided into four groups by SWLS scores, adjusted RRs tended to increase linearly with decreasing SWLS score for males (slightly satisfied: 1.18, 95% CI: 0.77–1.82; slightly dissatisfied: 1.65, 95% CI: 1.08–2.52; dissatisfied: 2.22, 95% CI: 1.44–3.42; p for trend < 0.001) and for females (slightly satisfied: 1.17, 95% CI: 0.42–3.30; slightly dissatisfied: 1.56, 95% CI: 0.56–4.36; dissatisfied: 2.38, 95% CI: 0.84–6.74; p for trend = 0.040). Conclusions: This study suggests that the risk of occupational injury was higher in workers not satisfied with life, and indicates attention to satisfaction with life may promote the health of workers.

Plasma Electrolytic Oxidation of Ti-6Al-4V Alloy after Cyclic ATO Treatment

Sang-Gyu Lim,Han-Cheol Choe 한국표면공학회 2018 한국표면공학회 학술발표회 초록집 Vol.2018 No.11

Evaluation of the relationship between upper incisor exposure and cephalometric variables in Korean young adults

Sung-Hoon Han,Eon-Hwa Lee,Jin-Hyoung Cho,Jong-Moon Chae,Sang-Cheol Kim,Na-Young Chang,Kyung-Hwa Kang 대한치과교정학회 2013 대한치과교정학회지 Vol.43 No.5

Objective: The purpose of this study was to classify Korean young adults into 3 groups on the basis of upper incisor exposure rates (UIERs) and to compare the skeletal, dental, and soft tissue variables. Methods: Samples were obtained from 127 students at the College of Dentistry, Wonkwang University in South Korea. Facial photographs of frontal posed smiles and lateral cephalograms of the subjects were taken. The subjects were divided into 3 groups on the basis of UIERs and 20 measurements were compared among the 3 groups. The correlations between the variables were determined. Results: Male and female subjects showed significant differences in the group distribution. Male subjects showed higher frequencies of low smiles, and female subjects showed higher frequencies of high smiles. The vertical height of the anterior alveolar process of the maxilla directly correlated with the UIER. However, the UIER showed no significant correlation with the vertical height of the anterior basal bone or the inclination of the upper incisor axis. In female subjects, the upper central incisor clinical crown length showed an inverse correlation with the UIER. However, this variable showed no significant correlation with the UIER in male subjects. Conclusions: The UIER was directly correlated with the levator muscle activity of the upper lip and inversely correlated with the upper lip thickness, yet there was no correlation between the UIER and upper lip length at rest.

Effects of Antibiotics on Suppression of Agrobacterium tumefaciens and Plant Regeneration from Wheat Embryo

Han, Si-Nae,Oh, Poo-Reum,Kim, Hong-Sig,Heo, Hwa-Young,Moon, Jun-Cheol,Lee, Sang-Kyu,Kim, Kyung-Hee,Seo, Yong-Weon,Lee, Byung-Moo The Korean Society of Crop Science 2007 Journal of crop science and biotechnology Vol.10 No.2

Antibiotics used for suppressing Agrobacterium in plant transformation procedure might have negligible effects on plant tissues and regeneration. The effects of antibiotics on growth suppression of Agrobacterium and plant regeneration were investigated for enhancing Agrobacterium-mediated transformation using wheat mature embryos. Antibiotics tested, except carbenicillin, were able to suppress that embryos were coated with a layer of Agrobacterium cells in callus induction medium. Agrobacterium growth was suppressed minimally at 50 mg/l of timentin, while cefotaxime and clavamox were completely suppressed at relative high concentration of 250 mg/l. In the treatment of carbenicillin, initiation of growth suppression of Agrobacterium occurred at 750 mg/l of concentration because Agrobacterium KYRT1 contains the carbenicillin resistant gene. In Agrobacterium inoculation, effects of antibiotics were significantly different on the rate of callus induction and shoot formation. Almost embryos were induced calli at 50 mg/l of timentin whereas callus induction rate was achieved above 90% at 100 mg/l and 250 mg/l of cefotaxime and clavamox, respectively. Shoot formation rate was higher in the treatment of timentin than that of cefotaxime and clavamox at 500 mg/l of concentration, respectively. Timentin can be used as a good antibiotics in Agrobacterium-mediated wheat transformation.

A New Phase Drift Anti-islanding Method for Grid-connected Inverter System

Cheol-Hee Yoo,Du-Hee Jang,Sang-Kyoo Han,Dong-Sung Oh,Sung-Soo Hong 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5

Islanding phenomenon of grid-connected photovoltaic (PV) power generation system refer to their independent operation when the utility is disconnectied. Since the islanding phenomenon causes significant hazards to personnel and equipment, PV power generation systems are required to detect and prevent the islanding operation. The islanding detection meethods can be classified into two categories : passive and active methods. If the power mismatch of real and reactive power of between the load and renewable power generation systems are small, the detecting accuracy of passive methods might be lowered. On the other hand, active methods can allegedly deteriorate power quality. This paper proposes a novel anti-islanding method that enables islanding detection by using current command with phase difference. The proposed method is able to not only reduce the non-detection zone (NDZ) but also minimize power quality deterioration. To confirm the validity of the proposed method, this paper presents simulation results, it was recognized that the whole procedure, from removal of the grid to system shutdown, was completed within 0.5 seconds.

Case Reports : Disseminated Cryptococcosis in a Patient with Pituitary Cushing`s Disease

Cheol In Kang,Sung Han Kim,Hong Bin Kim,Myoung Don Oh,Seong Yeon Kim,Kang Won Choe 대한내과학회 2003 The Korean Journal of Internal Medicine Vol.18 No.3

Disseminated cryptococcosis mainly occurs in patients with cell-mediated immunity disorders. A case of disseminated cryptococcosis, in a patient with pituitary Cushing`s disease, is reported. Cultures of blood, cerebrospinal fluid (CSF) and aspirates of a

Factors Affecting the Quality of Life of Korean Cancer Survivors Who Return to the Workplace

Han, Kyu-Tae,Park, Eun-Cheol,Kim, Sun Jung,Jang, Sung-In,Shin, Jaeyong,Kim, Chan Ok,Choi, Jaw Woo,Lee, Sang Gyu Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.20

Background: Although the prevalence of cancer is increasing, it is no longer synonymous with death. The number of cancer survivors is estimated to be increasing due to development in medical treatments and social programs; cancer survivors are increasingly returning to work after long-term unemployment. Thus, we examined the quality of life (QOL) and the factors associated with return of cancer survivors to the workplace. Materials and Methods: This study was performed using the 2008 Community Health Survey administered by the Korea Centers for Disease Control and Prevention (N=548). We used Chi-square tests to compare demographic variables based on self-perceived health status, and analysis of variance (ANOVA) to compare QOL scores among groups. We also performed a mixed-model analysis of the relationship between QOL and factors at the workplaces of cancer survivors. Results: Based on the results of our study, the overall QOL of cancer survivors was associated with 'mutual respect', 'free emotional expression', occupation, and age. Moreover, different trends of QOL according to self-perceived health were identified on additional analysis. In the 'bad' self-perceived health group, QOL was significantly different according to income. The QOL of cancer survivors in the low-income group was lower than in the other groups. Conversely, the 'normal' group had a lower QOL caused by 'no mutual respect' and "no free emotional expression" in the workplace. The QOL in the 'good' group based on self-perceived health was higher in the younger age group. Conclusions: There may be a significant relationship between QOL and workplace factors for cancer survivors, although further study is needed to investigate this relationship in detail. This may facilitate formulation of policy and efforts to prevent and manage the decline in the QOL of cancer survivors returning to work.

Development of Scoring Model on Customer Attrition Probability by Using Data Mining Techniques

Han, Sang-Tae,Lee, Seong-Keon,Kang, Hyun-Cheol,Ryu, Dong-Kyun The Korean Statistical Society 2002 Communications for statistical applications and me Vol.9 No.1

Recently, many companies have applied data mining techniques to promote competitive power in the field of their business market. In this study, we address how data mining, that is a technique to enable to discover knowledge from a deluge of data, Is used in an executed project in order to support decision making of an enterprise. Also, we develope scoring model on customer attrition probability for automobile-insurance company using data mining techniques. The development of scoring model in domestic insurance is given as an example concretely.

Series-Stacked Ripple-Free Resonant DC/DC Converter for Low Voltage Fuel-Cell Applications

Cheol-Hwan Kim,Gyeong-Seop Lim,Joo-Han Park,Muhammad Umer Amjad,Minsung Kim,Sang-Won Lee 전력전자학회 2023 ICPE(ISPE)논문집 Vol.2023 No.-

This paper presents series-stacked ripple-free resonant dc/dc converter for low voltage fuel-cell applications. By connecting two active voltage doublers in series, the proposed circuit achieved very high-voltage gain. Without using extra input inductors, active-clamped push-pull circuit operating with fixed duty-ratio at 0.5 generate the ripple-free input current; this trait extends the lifetime of the fuel-cell. The active power components are turned on and off with soft switching. A 1-kW prototype of the proposed converter is implemented and tested to verify the theoretical analysis.

Emotional labor and job types of male firefighters in Daegu Metropolitan City

Sung Kyu Park,Han Cheol Heo,Joon Sakong,Man Joong Jeon 대한직업환경의학회 2019 대한직업환경의학회지 Vol.31 No.-

Background: Research on the emotional labor of firefighters is actively being carried out, but studies that analyze emotional labor separately by job types, working departments, and other conditions of firefighters are insufficient. The purpose of this study is to investigate the difference in emotional labor level between departments and other conditions of firefighters. Methods: A total of 287 Korean firefighters were included for analysis. The demands of emotional labor and emotional damage were measured using the Korean Emotional Labor Scale. To analyze the conditions and factors affecting the emotional labor level of the firefighters, logistic regression analysis was performed using the emotional labor high risk group as a dependent variable. Results: The average score of overall emotional labor level of the firefighters was 47.2 ± 17.3, and the prevalence of high risk firefighters with emotional labor was 27.1%. It was found that the emergency medical service and administration departments showed a higher prevalence of high risk emotional labor firefighters than did other departments. The result of multiple logistic regression analysis for the high risk emotional labor firefighters showed that the adjusted odds ratio of emergency medical service department compared to the reference group (the rescue department) was 2.89 (95% confidence interval [CI]: 1.02–8.24). Conclusions: Among the firefighters, the emergency medical service department is a high risk factor for emotional labor. Therefore, education and prevention training on emotional labor should be more thorough before work shifts