• The Transactions of The Korean Institute of Electrical Engineers
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• v.67 no.6
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• pp.794-798
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• 2018

There is a growing need for a care system that can continuously monitor, manage and effectively relieve stress for modern people. In recent years, mobile healthcare devices capable of measuring heart rate have become popular, and many stress monitoring techniques using heart rate variability analysis have been actively proposed and commercialized. In addition, respiratory biofeedback methods are used to provide stress relieving services in environments using mobile healthcare devices. In this case, breathing information should be measured well to assess whether the user is doing well in biofeedback training. In this study, we extracted the heart beat interval signal from the PPG and used the oscillator based notch filter based on the IIR band pass filter to track the strongest frequency in the heart beat interval signal. The respiration signal was then estimated by filtering the heart beat interval signal with this frequency as the center frequency. Experimental results showed that the number of breathing could be measured accurately when the subject was guided to take a deep breath. Also, in the timeing measurement of inspiration and expiration, a time delay of about 1 second occurred. It is expected that this will provide a respiratory biofeedback service that can assess whether or not breathing exercise are performed well.

• Journal of Environmental Science International
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• v.25 no.9
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• pp.1341-1348
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• 2016

The natural environment plays an important role not only in ecological sustainability, but also in human health. Growing attention has been focused on the health benefits of natural environments with increasing scientific evidence in this field. Urban green space has positive effects on individual and community health; thus, it is considered as social infrastructure. The natural environment promotes mental health by relieving psychological stress and depression. Physical health can be improved by experiencing nature, which reduces physiological stress and boosts the immune system. Several international initiatives have been undertaken to improve our understanding in this field and to utilize these benefits for health promotion. Interdisciplinary approaches are needed to promote human health through the natural environment in the fields of science, education, planning and policy.

• Journal of Digital Convergence
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• v.17 no.5
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• pp.287-293
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• 2019

The purpose of this study is to find out whether social support perceived by a health science student affects career stress and to provide basic data for counseling using social support as an effective career guidance. This study subject to 307 students from J university in Jeonju. The survey was conducted by questionnaire. The survey content consisted of social support, career stress, and general characteristics of the subject. The study found that the lower the academic stress, the higher the social support score in the high family socioeconomic status group and the higher the academic stress, the higher the career stress in the general characteristics of the subjects. Based on the results of this study, we have confirmed that social support affects career Stress. Therefore, social support may serve as a protection factor for health science students who received career stress by relieving stress and improving satisfaction with own life.

• Journal of Digital Convergence
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• v.15 no.2
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• pp.405-409
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• 2017

The purpose of this study is to obtain basic data to be used in social welfare intervention for relieving psychological burdens caused by job stress in the eco-boomer generation that will be the center of Korean society in future, by estimating job stress change trajectories of the eco-boomer generation in the convergence era, figuring out predicting factors and examining job stress factors that individuals experience, in accordance with the degree of job stress and the changes. This is a longitudinal study using secondary data and for analysis, the Latent Growth Model(LGM) was applied to the 1st year to the 7th year Korean Welfare Panel Data. Self-esteem was one of job stress predicting factors of the eco-boomer generation. Since most of eco-boomers were students in the early measurement period, the level of job stress was low, but over time, the burden of job increased by gradation. This study has significance by providing an empirical basis for predicting factors of job stress changes of the eco-boomer generation to understand job stress in the eco-boomer generation.

• Journal of Ginseng Research
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• v.47 no.6
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• pp.766-772
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• 2023

Background: Korean Red Ginseng (KRG) is an effective anti-stress treatment. In this study, we investigated the therapeutic potential effects of KRG on relieving stress in a general population using transcriptome analysis. Methods: We conducted an 8-week clinical pilot study on 90 healthy men who reported stress. The study was completed by 43 participants in the KRG group and 44 participants in the placebo group. Participants were randomized 1:1 to the KRG and placebo groups. We evaluated the stress by stress response inventory (SRI) at baseline and 8 weeks. The main outcomes were changes in the levels of neurotransmitters (NTs) and NT-related gene expression. NTs were analyzed using automated (GC) content, and levels of gene expression were measured by reads per kilobase of transcript per million mapped reads (RPKM). Results: The KRG group showed significantly preserved epinephrine decrease compared with placebo group at 8 weeks (changes in epinephrine, KRG vs. placebo; -1623.2 ± 46101.5 vs. -35116.3 ± 86288.2, p = 0012). Among subjects who higher SRI score, meaning stress increased compared to baseline, the KRG group showed a smaller decrease in serotonin than the placebo group (changes in serotonin, KRG vs. placebo; -2627.5 ± 5859.1 vs, -8087.4 ± 7162.4, p = 0.005) and a smaller increase in cortisol than the placebo group (changes in cortisol, KRG vs. placebo; 1912.7 ± 10097.75 vs. 8046.2 ± 8050.6 , p = 0.019) in subgroup analysis. Transcriptome findings indicated that KRG intake affects gene expression related with metabolism of choline, adrenalin, and monoamine. Conclusion: These findings suggest that KRG has beneficial effects on the amelioration of stress response in NTs, and this effect is more prominent in stressful situations. Further clinical studies are required to confirm the anti-stress effect of KRG.

• The Korean Journal of Health Service Management
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• v.13 no.3
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• pp.149-162
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• 2019

Objectives: The purpose of this study was to identify differences in characteristics of the people who frequently drink alone between those in old-city regions and those in other regions in Busan, focusing on socio-demographic factors and the level of drinking according to the types of stress. Methods: The analysis confirmed the differences based on Busan Social Statistics Data in 2012, 2014, and 2016. Frequencies by each variable were presented, and ${\chi}^2$ and logistic regression analysis were also used in the analysis. Results: The residents of Busan showed higher odds ratios of "frequent drinking alone" when they felt considerably higher-than-normal levels of stress. In addition, in the residents of old-city regions, the odds ratios of those who frequently drank alone were not different between people who could easily relieve stress, who experienced economic stress, or who had relationship stress and people who did not. However, higher odds ratios of frequently drinking alone were reported when such participants felt some stress related to work, family, relationships, and so on. Conclusions: Interventions for the appropriate relief of stress caused by different reasons, as well as other stress-relieving methods, should be implemented for the people's benefits.

• Transactions of the Korean Society of Pressure Vessels and Piping
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• v.17 no.2
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• pp.145-156
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• 2021

Ultrasonic Nanocrystal Surface Modification (UNSM) is a peening technology that generates elastic-plastic deformation on the material surface to which a static load of a air compressor and a dynamic load of ultrasonic vibration energy are applied by striking the material surface with a strike pin. In the UNSM-treated material, the structure of the surface layer is modified into a nano-crystal structure and compressive residual stress occurs. When UNSM is applied to welds in a reactor coolant system where PWSCC can occur, it has the effect of relieving tensile residual stress in the weld and thus suppressing crack initiation and propagation. In order to quantitatively evaluate the compressive residual stress generated by UNSM, many finite element studies have been conducted. In existing studies, single-path UNSM or UNSM in a limited area has been simulated due to excessive computing time and analysis convergence problems. However, it is difficult to accurately calculate the compressive residual stress generated by the actual UNSM under these limited conditions. Therefore, in this study, a minimum finite element peening analysis area that can reliably calculate the compressive residual stress is proposed. To confirm the validity of the proposed analysis area, the compressive residual stress obtained from the experiment are compared with finite element analysis results.

• The Journal of the Korea Contents Association
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• v.20 no.1
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• pp.701-710
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• 2020

The purpose of this study is to investigate the moderating effect of anger expression styles on the relationship between school stress and interpersonal problem in adolescent. A total 300 students of middle and high school located in Chungcheongbuk-do completed the questionnaires to assess school stress, anger expression styles, and interpersonal problem during September to October, 2015 and 261 data were used in this report. Using multiple and hierarchical regression analysis, the results indicated that school stress, anger-in and anger-out significantly contributed to interpersonal problem. The interaction effect of school stress and anger expression styles were not significant. But anger-out significantly moderated the impact of school stress on domineering/controlling of interpersonal problem. These findings suggest that the intervention for preventing and relieving interpersonal problem in adolescent should focus on reducing school stress and maladaptive anger expression. Limitations and futre directions were discussed.

• Journal of the Korea Convergence Society
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• v.9 no.12
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• pp.331-336
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• 2018

The purpose of this study is to help female office workers in relieving their stress in rapidly changing modern society and maintaining a healthy and beautiful life by analyzing the complex effects of alternative beauty therapy on stress relaxation targeting 50 female office workers in their 30s to 40s, usually showing a high stress index due to their work. Aroma therapy and dry relax massage were carried out for 15 minutes as a beauty therapy, and stress index of the subjects was confirmed through survey before performing the beauty therapy. The experiment was conducted once a week for four weeks, and the cortisol concentration in saliva was analyzed for the outcome measurement. As a result, average stress index was 3.97 which showed a high value, and the cortisol concentration of the subjects after the experiment decreased significantly (p<0.05), and especially subjects who were married and had caregiving responsibility showed more changes in their cortisol concentration. The above result shows that dry relax massage using aroma is highly effective for mind and body relaxation of women in their 30s to 40s who are significantly stressed. If such beauty measures are applied properly, it is judged to be helpful for managing the stress.

• Asian-Australasian Journal of Animal Sciences
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• v.27 no.10
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• pp.1513-1520
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• 2014

The present aim was to investigate the effects of traditional Chinese medicine prescriptions (TCM) on body temperature, blood physiological parameters, nutrient apparent digestibility and growth performance of beef cattle under heat stress conditions. Twenty-seven beef cattle were randomly divided into three groups as following; i) high temperature control (HTC), ii) traditional Chinese medicine prescriptions I+high temperature (TCM I) and iii) traditional Chinese medicine prescriptions II+high temperature (TCM II) (n = 9 per group). The results showed that the mean body temperature declined in TCM II treatment (p<0.05). Serum $T_3$ and $T_4$ levels with TCM I and TCM II treatments elevated (p<0.05), and serum cortisol levels of TCM I treatments decreased (p<0.05), compared with the HTC group. Total protein, albumin, globulin in TCM II treatments elevated and blood urea nitrogen levels of both TCM treatments increased, but glucose levels of both TCM treatments decreased, compared with the HTC group (p<0.05). The apparent digestibility of organic matter and crude protein with TCM I treatment increased, and the apparent digestibility of acid detergent fiber elevated in both TCM treatments (p<0.05). Average daily feed intake was not different among three groups, however average daily gain increased and the feed:gain ratio decreased with both TCM treatments, compared with the HTC group (p<0.05). The present results suggest that dietary supplementation with TCM I or TCM II improves growth performance of heat stressed beef cattle by relieving heat stress responses and increasing nutrient apparent digestibility.