• 재활치료과학
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• 제6권2호
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• pp.71-83
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• 2017

Objective: This study was to develop and verify the effects of the exercise-cognitive combined dual-task training program on cognitive function and depression of the elderly with mild cognitive impairment(MCI). Methods: The subjects were randomly assigned to the exercise-cognitive combined dual-task training group(n=32) or single-task training group(n=31). To identify the effects on cognitive function, general cognitive function, frontal lobe function, and attention/working memory were measured. Depression was evaluated using Korean version of Geriatric Depression Scale. The outcome measurements were performed before and after the 8 weeks of intervention(2 days per week). Results: After 8 weeks, general cognitive function, frontal cognitive function, attention/working memory function, depression of the dual-task training group were significantly increased than those of the single-task training group(p<0.05). Conclusion: The results indicated that an exercise-cognitive combined dual-task training for MCI was effective in improving general cognitive function, frontal /executive function, attention/working memory function and reducing depression.

• 감성과학
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• 제22권4호
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• pp.31-44
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• 2019

본 연구의 목적은 노화에 따른 작업기억능력의 저하에 영향을 받는 자막인식위치에 대해 탐구하는 것이다. 이를 위해, 본 연구에는 주니어 집단(평균 나이: 26세, 표준편차: 3.06, N=27)과 시니어 집단(평균 나이: 61.69세, 표준편차: 4.18, N=26)이 참여했으며, 실험 과제로는 실험 참가자들의 작업기억능력을 측정하기 위한 N-back 과제와 자막인식위치를 측정하기 위한 동영상자막확인 과제가 사용되었다. N-back 과제 수행 결과, 시니어 집단이 주니어 집단보다 과제에 대한 반응속도가 느리고 정답률이 낮게 나타나, 시니어 집단은 주니어 집단에 비해 작업기억능력의 저하가 나타났다는 것을 의미했다. 또한, 동영상자막확인 과제 수행 결과, 노화에 따른 작업기억능력의 저하에 부정적인 영향을 받는 자막위치는 화면의 '좌측-아래'이고 긍정적인 영향을 받는 자막위치는 화면의 '좌측-가운데'으로 나타났다. 나머지 화면 위치에서는 노화에 따른 작업기억능력의 저하에 영향을 받지 않았다. 결과적으로 본 연구 결과를 통해서 연령의 증가에 따른 작업기억능력의 저하에 부정적 혹은 긍정적 영향을 받는 영상 속 자막인식위치에 대해서 살펴볼 수 있었으며, 이는 영상에 자막을 제시해야할 경우 시청자의 연령을 고려하여 자막위치를 선정하면 효율적으로 시청자에게 정보를 제공할 수 있다는 것을 의미했다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제14권12호
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• pp.4748-4762
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• 2020

Recently, the COVID 19 pandemic has affected on our daily lives and society in many ways. Specifically, it has brought rapid changes in the working environment from office working to smart telecommuting. In addition, cloud computing technology and services not only provided ubiquitous access, but also led to a sharing of information, internal-external communication channels, telework, and innovative smart work for the business process. As a result, smart work services based on social cloud networking have spread to the public sector. However, existing academic research examining smart work merely remains to focus on the theoretical conceptualization or to deal with merely several examples of private views. Best practices of smart work services based on cloud computing technology in the public field rarely exists. Moreover, many studies have been differently measured the values of smart work for private and public sectors depending on organizational singularities. Therefore, the study aims to define new theoretical implications and to explore future business strategies and policy directions based on a technical working group's personal psychological subjectivity. The research applied Q methodology, and selected five public organizations in Korea, that they have adopted or currently plan to adopt some part of smart work services.

• 설비공학논문집
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• 제21권9호
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• pp.505-512
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• 2009

A thermosiphon is utilized as a thermal shunt to reduce the cool-down time of a cryogenic system cooled by a two stage cryocooler. The cool-down time reduction by the thermosiphon is determined by the type of working fluid which is directly related to the operating temperature range of the thermosiphon. A mixed working fluid has a potential to widen the operation temperature range of the thermosipohon. In this study, the thermosiphon using N$_2$ and CF$_4$ mixture as the working fluid is fabricated and tested to verify its transient heat transfer performance. The thermosiphon with the mixed working fluid has no noticeable reduction of cool-down time compared with that of the thermosiphon with pure working fluid in this experiment. However, it seems that the thermosiphon with mixed working fluid may have an advantage according to the cooling capacity of a cryocooler, the cooling target temperature and the size of a cooling object.

• Safety and Health at Work
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• 제11권1호
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• pp.118-124
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• 2020

Background: The poultry industry in Pakistan has flourished since the 1960s; however, there are scarce data regarding the impact of occupational exposure on the pulmonary health of farm workers in terms of years working in the industry. The objective of the present study was to assess the effect of poultry environment on the health of occupationally exposed poultry farmers in countries of warm climatic regions, such as Pakistan. This study will also show the effect of exposure to poultry facilities on the health of poultry farmers in the context of low-income countries with a relatively inadequate occupational exposure risk management. Materials and methods: The lung function capacity of 79 poultry workers was measured using a spirometer. Along with spirometry, a structured questionnaire was also administrated to obtain information about age, height, weight, smokers/nonsmokers, years of working experience, and pulmonary health of farm workers. The workers who were directly involved in the care and handling of birds in these intensive facilities were considered and divided into four groups based on their years of working experience: Group I (3-10 months), Group II (1-5 years), Group III (6-10 years), and Group IV (more than 11 years). The forced vital capacity (FVC), forced expiratory volume in one second (FEV1) and the FEV1/FVC ratio were considered to identify lung function abnormalities. Statistical analysis was carried out using independent sample t test, Chi-square test, Pearson's correlation, and linear regression. Results: Based on the performed spirometry, 68 (86 %) of workers were found normal and healthy, whereas 11 (14 %) had a mild obstruction. Of the 11 workers with mild obstruction, the highest number with respect to the total was in Group IV (more than 11 years of working experience) followed by Group III and Group II. Most of the workers were found healthy, which seems to be because of the healthy survivor effect. For the independent sample t test, a significant difference was noticed between healthy and nonhealthy farmers, whereas Chi-square test showed a significant association with height, drugs, and working experience. Linear regression that was stratified by respiratory symptoms showed for workers with symptoms, regression models for all spirometric parameters (FVC, FEV1, and FEV1/FVC) have better predictive power or R square value than those of workers without symptoms. Conclusion: These findings suggest that lung function capacity was directly related to years of working experience. With increasing number of working years, symptoms of various respiratory problems enhanced in the poultry workers. It should be noted that most of the poultry workers were healthy and young, the rationale being that there is a high turnover rate in this profession. The mobility in this job and our finding of 86% of the healthy workers in the present study also proposed healthy worker survivor effect.

• Safety and Health at Work
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• 제15권1호
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• pp.73-79
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• 2024

Background: This study aimed to investigate the relationship between work-related communication devices use during work outside of regular working hours and depressive symptoms in wage workers. Methods: Data from 50,538 workers aged 15 years or older who had participated in the 6th Korean Working Condition Survey (KWCS) were used. The final sample was 32,994 wage workers. The questionnaire asked the respondents how often they used communication devices for work during work outside of regular working hours. Depressive symptoms were assessed using WHO-5 Well-Being Index. Multiple logistic regression analysis was used to analyze the association between work-related communication devices use during work outside of regular working hours and depressive symptoms. Results: The rate of depressive symptoms was highest among workers who did not use work-related communication devices during work outside of regular working hours. After adjusting for socio-demographic and work-related factors, the odds ratio of depressive symptoms among workers who used communication devices when working outside of regular working hours was 1.20 (95% CI: 1.09-1.32); the odds ratio of depressive symptoms in the group not using communication devices for free-time work was 1.66 (95% CI: 1.37-2.00), which was higher than that of the reference group, that is, workers who did not work outside of regular working hours, and was statistically significant. Conclusion: Regardless of whether work-related communication devices are used, working outside of regular working hours increases depressive symptoms. The use of work-related communication devices during work outside of regular working hours can reduce the rate of depressive symptoms.

• 근관절건강학회지
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• 제16권2호
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• pp.135-144
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• 2009

Purpose: The purpose of this study was to develop an exercise program to prevent osteoporosis in working women and to examine its effects on bone mineral density (BMD). Method: The subjects of the study were 55 working women. The experimental group participated three times per week for twelve weeks in this exercise program. T-test and ANOVA, Pearson's correlation coefficients were used to analyze the data. Results: The BMD of the experimental group prior to participating in the exercise program was 0.9301 $(\pm08620)g/cm^2$. However, after the exercise program, the BMD increased to 0.9415 $(\pm1117)g/cm^2$ (t=-2.338, p=.026). Moreover, in relations to BMD and physiological variables, there were significant correlations between BMD and physical activity (r=.294, p=.030), as well as between BMI and physical activity (r=.267, p=.049). Conclusion: In this study, BMD in the experimental group had significantly increased after their participation, while the control group had decreased. Thus, this study showed that the exercise program developed for working women is effective in maintaining BMD and consequently preventing osteoporosis.

• 임상간호연구
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• 제25권2호
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• pp.161-169
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• 2019

Purpose: This study was conducted to examine the effect of a Happiness Self-Coaching program for new graduate nurses working in cancer care units. Methods: A quasi-experimental pretest-posttest, nonequivalent control-group design was applied to conduct the study. Study participants were new graduate nurses employed within 12 months and working as shift employees at G university hospital, located in J city. A total of 21 new graduate nurses participated in the study, 10 in the experimental group, and 11 in the control group. The happiness self-coaching program was conducted weekly for 70 minutes from February 1 to June 6, 2016 for 6 weeks. The experimental group received the Happiness Self-Coaching program through lectures, presentation, group activities, and strength card play. Data were analyzed by using repeated measure ANOVA and paired t-test. Results: The experimental group demonstrated significantly higher happiness (F=6.82, p=.003) and self-efficacy (F=3.38 p=.045) levels compared to the control group. Conclusion: The Happiness Self-Coaching program was effective in enhancing new graduate nurses' happiness and self efficacy. It is recommended that nursing organizations to apply the Happiness Self -Coaching program to facilitate adaption of new graduate nurses in cancer care units.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2005년도 학술발표회(2)
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• pp.1405-1406
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• 2005

• 한국전자파학회논문지
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• 제21권10호
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• pp.1143-1153
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• 2010

본 논문에서는 마이너스 군지연 회로를 이용하여 아날로그 RF 피드백 증폭기의 선형성 개선 대역폭을 증가시킬 수 있는 새로운 방법을 제안한다. 피드백 증폭기는 피드백 경로의 전달 시간 오차로 인하여 선형성 개선 대역폭이 제한되며, 그로 인하여 강력한 선형성 개선 효과에도 불구하고 거의 사용되지 않고 있다. 선행 연구를 통해 설계된 마이너스 군지연 회로의 군지연 특성을 응용하여 기존의 피드백 구조의 한계인 군지연 정합 문제를 해결하였다. 제작된 피드백 증폭기에 2-carrier Wideband Code Division Multiple Access (WCDMA) 신호를 인가하여 측정한 결과, WCDMA 기지국 하향 대역의 50 MHz 대역 전반에 걸쳐서 15 dB 이상의 선형성 개선 효과를 얻을 수 있었다. 평균 출력 전력이 28 dBm일 때 5 MHz 이격된 주파수에서 측정된 인접 채널 누설비(Adjacent Channel Leakage Ratio: ACLR)는 최대 25.1 dB 개선되어 -53.2 dBc로 측정되었다.