• Annals of Occupational and Environmental Medicine
• /
• v.35
• /
• pp.8.1-8.12
• /
• 2023

Background: Prolonged use of visual display terminal (VDT) can cause eyestrain, dry eyes, blurred vision, double vision, headache and musculoskeletal symptoms (neck, shoulder, and wrist pain). VDT working hours among workers have greatly increased during the coronavirus disease 2019 (COVID-19) pandemic. Therefore, this study aimed to investigate the relationship between VDT working hours and headache/eyestrain in wage workers using data from the sixth Korean Working Conditions Survey (KWCS) (2020-2021) conducted during the COVID-19 pandemic. Methods: We analyzed the sixth KWCS data of 28,442 wage workers aged 15 years or older. The headache/eyestrain that occurred in the last year was assessed. The VDT work group included workers who use VDT always, almost always, and three-fourth of the working hours, while the non-VDT work group included workers who use VDT half of the working hours, one-fourth of the working hours, almost never, and never. To analyze the relationship between VDT working hours and headache/eyestrain, the odds ratios (ORs) and 95% confidence interval (CI) were calculated using logistic regression analysis. Results: Among the non-VDT work group, 14.4% workers experienced headache/eyestrain, whereas 27.5% workers of the VDT work group experienced these symptoms. For headache/eyestrain, the VDT work group showed adjusted OR of 1.94 (95% CI: 1.80-2.09), compared with the non-VDT work group, and the group that always used VDT showed adjusted OR of 2.54 (95% CI: 2.26-2.86), compared with the group that never used VDT. Conclusions: This study suggests that during the COVID-19 pandemic, as VDT working hours increased, the risk of headache/eyestrain increased for Korean wage workers.

• The Bulletin of The Korean Astronomical Society
• /
• v.40 no.1
• /
• pp.88.4-89
• /
• 2015

The Double Pulsar (PSR J0737-3039) is the only neutron star-neutron star (NS-NS) binary in which both NSs have been detectable as radio pulsars. The Double Pulsar has been assumed to dominate the Galactic NS-NS binary merger rate $R_g$ among all known systems, solely based on the properties of the first-born, recycled pulsar (PSR J0737-3039A, or A) with an assumption for the beaming correction factor of 6. In this work, we carefully correct observational biases for the second-born, non-recycled pulsar (PSR J0737-0737B, or B) and estimate the contribution from the Double Pulsar on $R_g$ using constraints available from both A and B. Observational constraints from the B pulsar favour a small beaming correction factor for A (~2), which is consistent with a bipolar model. Considering known NS-NS binaries with the best observational constraints, including both A and B, we obtain $R_g=21_{-14}{^+28}$ per Myr at 95 per cent confidence from our reference model. We expect the detection rate of gravitational waves from NS-NS inspirals for the advanced ground-based gravitational-wave detectors is to be $8_{-5}{^+10}$ per yr at 95 per cent confidence. We discuss prospects of gravitational-wave detection based on our results. Implications of PSR J1906+0746, which is likely to be another tight NS-NS binary in the Galactic disc supported by recent observation, are also remarked.

• Journal of the Korean Society of Food Culture
• /
• v.10 no.3
• /
• pp.175-184
• /
• 1995

The awareness of the nutrition labeling of 82 food producers and 668 government officials was assessed and compared, from May to June in 1994, to that of consumers. Compared to 82.4% of cosumers, 48.1% of producers and 47.8% of officials answered that nutrition labeling is necessary. 48% of producers expected a modest food price rise, but 70% thought food sales would not be affected with nutrition labeling. While being worried about the regulatory difficulties and the increased work load given the inadequate implementation of the current food labeling system due to insufficient personnel, 50.2% of officials wanted the new nutrition labeling system to be introduced within $1{\sim}2$ years. Contrary to the general dissatisfaction with the system and the lack of confidence in it on the part of consumers, producers thought that they currently provide sufficient food information for consumers, and that consumers had much confidence in it. Producers and officials were more found worried about consumers' inadequate understanding and inactive use of the system in contrast to the widespread and welcome support on the part of consumers. But it was fully agreed by all that education and awareness is crucial for the successful implementation of nutrition labeling system.

• Journal of Korean Academy of Nursing
• /
• v.27 no.2
• /
• pp.329-340
• /
• 1997

Resourcefulness was analyzed by Walker and Avant's method to make a theoretical framework for nursing. Also, the appropriate Korean terminology was identified.“Resourcefulness”means the ability to use internal and external resources to eliminate or to control stress. '자원동원성' is chosen to be the most appropriate term to reflect the concept of resourcefulness. Upon the concept analysis, availability, controllability, confidence, and self-instruction were identified as the defining characteristics of resourcefulness. Contrary to other work, "availability" means the ability to use the social resources as well as the internal cognitive-behavioral resources. “Controllability” means the ability to delay or control immediate gratification of one's needs or to divert one's own mood in order to solve problem. "Confidence" is the self-efficacy belief in one's control ability. "Self-instruction" is the cognitive ability to instruct oneself positively. Resourcefulness is learned by active experience, vicarious experience, and formal or informal instruction, and it is cued in the presence of a stressful situation or a need for change. As a result of the use of resourcefulness, the target behavior performed immediately and ultimately improve the quality of life or adaptation. Therefore, it is necessary to develop the instrument including the defining attributes identified in this study. Also, it is necessary to simultaneously analyze the related concepts of self-efficacy, self-control, and self-regulation for appropriate use.

• Korean Medical Education Review
• /
• v.18 no.2
• /
• pp.83-89
• /
• 2016

The purpose of this study was to elucidate to what extent the goals of the leadership training program implemented in a medical college were achieved. Study subjects consisted of 74 first-year premedical students at the College of Medicine of The Catholic University of Korea. All participants completed two questionnaires: an 18-item self-leadership questionnaire asking self-expectation, rehearsal, goal setting, self-rewards, self-judgment and constructive thinking, and a 28-item self-efficacy questionnaire asking preference toward difficult work, efficacy of self-control, and confidence before and after the leadership training program. Students also competed a program satisfaction survey after the program. The collected data were analyzed with a paired t-test, descriptive statistics by IBM SPSS ver. 20.0 (IBM Co., Armonk, NY, USA). Students' overall satisfaction with the program scored 4.06 out of 5. The scores of self-leadership and self-efficacy increased after the leadership training program except for 'confidence' in self-efficacy. The results indicate that an intensive leadership program in a short period of time could help to enhance social competencies such as communication skills, empathy, self-reflection, and teamwork of premedical students.

• Journal of Integrative Natural Science
• /
• v.14 no.3
• /
• pp.123-129
• /
• 2021

This research examines the effect of positively skewed population distribution on the two sample t-test through simulation. For simulation work, two independent samples were selected from the same chi-square distributions with 3, 5, 10, 15, 20, 30 degrees of freedom and sample sizes 3, 5, 10, 15, 20, 30, respectively. Chi-square distribution is largely skewed to the right at small degrees of freedom and getting symmetric as the degrees of freedom increase. Simulation results show that the sampled populations are distributed positively skewed like chi-square distribution with small degrees of freedom, the F-test for the equality of variances shows poor performances even at the relatively large degrees of freedom and sample sizes like 30 for both, and so it is recommended to avoid using F-test. When two population variances are equal, the skewness of population distribution does not affect on the t-test in terms of the confidence level. However even though for the highly positively skewed distribution and small sample sizes like three or five the t-test achieved the nominal confidence level, the error limits are very large at small sample size. Therefore, if the sampled population is expected to be highly skewed to the right, it will be recommended to use relatively large sample size, at least 20.

• Safety and Health at Work
• /
• v.12 no.1
• /
• pp.108-113
• /
• 2021

Background: This study aimed to investigate the relationship between changes in employment status and new-onset depressive symptoms through a one-year follow-up of permanent waged workers. Methods: We analyzed the open-source data from the Korea Welfare Panel Study. Using the 2017 data, we selected 2,314 permanent waged workers aged 19 to 59 years without depressive symptoms as a base group. The final analysis targeted 2,073 workers who were followed up in 2018. In 2018, there were five categories of employment status for workers who were followed up: permanent, precarious, unemployed, self-employed, and economically inactive. Multiple logistic regression was used to determine the association between employment status change and new-onset depressive symptoms. Results: Adjusted multiple logistic regression analysis showed that among male workers, workers who went from permanent status to being unemployed (odds ratio: 4.50, 95% confidence interval: 1.19 to 17.06) and from permanent status to being precarious workers (odds ratio: 3.15, 95% confidence interval: 1.30 to 7.65) had significantly high levels of new-onset depressive symptoms compared with those who retained their permanent employment status. There were no significant increases in new-onset depressive symptoms of male workers who went from permanent status to being self-employed or economically inactive. On the other hand, no significant differences were found among female workers. Conclusion: Our study suggests that the change of employment status to precarious workers or unemployment can cause new-onset depressive symptoms in male permanent waged workers.

• Journal of Research and Publication Ethics
• /
• v.5 no.1
• /
• pp.13-18
• /
• 2024

Purpose: Since 2006, social, ethical, and institutional options have been attempted in Korea to establish research ethics; however, the effectiveness of these attempts has not been thoroughly examined. Studies have been conducted abroad to determine the timeliness of social, ethical and institutional alternatives, such as the adoption of laws governing research ethics, the improvement of research ethics education, the bolstering of systems, the introduction of incentive programs, and the creation of social environments that support research ethics. Research design, data, and methodology: Specific facets of research misconduct or research ethics must be investigated and verified. Aspects of moral growth at the person level must be investigated via research ethics and research ethics education. Results: There is an increasing need for the general public to define and uphold research ethics as the impact of research findings on society grows. Researchers can boost their confidence in their ethical judgments and actions by being aware of research ethics. This may lead to confidence in their capacity to make morally sound decisions. Conclusion: By doing this study, the researcher confirmed that ethically correct behavior can lead to and realize self-growth. Researchers may be more interested in and dedicated to their work when they feel that their research might help them mature and develop ethically.

• Journal of Korean Society of Transportation
• /
• v.17 no.2
• /
• pp.193-198
• /
• 1999

An asymptotic distribution of the ratio of two normal vectors is estimated. Using the estimated asymptotic distribution, an approximation method to estimate confidence interval of passenger's value of travel time is proposed. As a result of empirical study the 95% confidence interval of value of travel time of home-to-work trips in city of Seoul is estimated at ￦7341.25$\pm$1945.05/hr.

• East Asian Economic Review
• /
• v.17 no.2
• /
• pp.161-206
• /
• 2013

Since the global financial crisis in 2008, the world economy has been suffering from the Great Recession characterized by high and persistent unemployment as well as drastic fall in asset prices. Real business cycle theory or new-Keynesian economics which has been the dominant paradigm in macroeconomics for the last four decades is unable to explain the high and persistent unemployment during the Great Recession. This implies that the economics of Keynes should be taken seriously again as a tool to explain the Great Recession. Farmer (2012) proposes a new way of interpreting the economics of Keynes by providing it with a solid micro-foundation based on labor markets with search. According to Farmer (2012), aggregate economic activity independently depends on the long-term self-fulfilling expectations about the stock prices. As a consequence, the government or the central bank should implement a policy that influences the public's confidence about the stock market. For an open economy like the Korean economy, it is not only stock price but also the price of asset such as house that matters more for the aggregate economic activity. Households in the Korean economy hold more than 70 percent of their wealth in the form of real estate asset, especially housing asset. This makes the public's confidence about the future prices of houses even more important in explaining the business cycles of the Korean economy. Policymakers should implement policies to improve the confidence of households about the housing market to recover from the recession caused by a fall in house prices. Little theoretical work has been done in explaining fluctuations in the aggregate economic activity from the point of house prices. This paper develops a small open economy model with traded and non-traded capital based on Farmer (2012) and shows that the aggregate economic activity also independently depends on the households' self-fulfilling expectations about the future prices of non-traded asset such as houses.