• Asian-Australasian Journal of Animal Sciences
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• v.21 no.6
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• pp.912-916
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• 2008

Pre-slaughter conditions affect poultry meat quality. Therefore, stresses before slaughter like heat stress, struggle and shackling on the shackle line, crating and transport and feed withdrawal are very important for the poultry industry in respect of quality as well as welfare of the birds. However, exposure to heat in oxidative stress can in turn lead to cytotoxicity in meat type birds. Chickens exposed to heat stress before slaughter showed the lowest ultimate pH and birds shackled for a longer time the highest. The abdominal fat content was higher in heat stressed birds. Struggling on the shackle line hastened the initial rate of the pH drop and increased the redness of breast meat. Again, with increasing struggling activity, lactate concentration in breast muscle of chicken increased. Paler meat was found in birds that were transported for a longer time than in those after a small journey or not transported. The pre-slaughter and eviscerated weights were decreased as the length of feed withdrawal period increased.

• Journal of Digital Convergence
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• v.16 no.12
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• pp.467-475
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• 2018

The purpose of this study is to investigate the relationship andropause symptoms, stress, self-esteem and quality of life among middle-aged men. The data were collected from Jun to August 2017. The subjects were 40 to 60 year old males residing in Y city and 198 questionnaires were analyzed. A menopausal man's quality of life was significantly different according to final education, monthly income, exercise status, the scores of quality of life was negatively correlated with those of andropause symptoms and stress, but positively correlated with those of self-esteem. The result of adding six variables that have significantly different quality of life, factors influencing quality of life are self-esteem, stress, andropause symptoms, monthly income and analysis result, explaining 52.3% of the variance. Therefor, The results of this study through repeated research in the future, it will contribute to the development and application of a nursing arbitration program to improve the quality of life for men in menopause.

• Animal cells and systems
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• v.14 no.4
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• pp.267-274
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• 2010

The decrease in sperm quality under heat stress causes a great loss in animal husbandry production. In order to reveal the mechanism underlying the sperm quality decrease caused by heat stress, we first established a mild heat-treated mouse model. Then, the sperm quality was identified. Further, the testicular proteome profile was mapped and compared with the control using 2D electrophoresis and mass spectrometry. Finally, the differential expressed proteins involved in the heat stress response were identified by real-time PCR and Western blotting. The results showed that heat stress caused a significant reduction in mouse sperm quality (P<0.05). Further, 52 protein spots on the 2D gel were found to differ between the heat-shocked tissues and the control. Of these spots, some repair proteins which might provide some explanation for the influence on sperm quality were found. We then focused on Bag-1, Hsp40, Hsp60 and Hsp70, which were found to be differently expressed after heat shock (P<0.05). Further analysis in this heat-shocked model suggests numerous potential mechanisms for heat shock-induced spermatogenic disorders.

• Journal of Sensor Science and Technology
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• v.20 no.2
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• pp.118-123
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• 2011

Heart related diseases mainly caused by heavy work load and increasing stress in human daily life. Therefore, researches on mobile healthcare monitoring for daily life has been carried out. Notably, wearable healthcare monitoring system which has least restriction has been tried to provide an emergency alert of abnormal heart rate. In this study, we developed chair type unconstrained BCG measurement system which able to perform continuous heart status monitoring at the office and daily life in the unconstrained way. Furthermore, adaptive threshold is used to detect the heart rate from BCG signals. The HRV(heart rate variability) is calculated from heart rate interval. ECG signal measured using conventional method and BCG signal measured using unconstraint system are carried out simultaneously for the purpose of performance evaluation. From the comparison result, BCG signal shows a similar heart beat characteristic as ECG signal. This proves the possibility of practical implementation of unconstraint healthcare monitoring system. In addition, medical examination like valsalva maneuver is performed to observe the changes in HRV due to stress. By performing valsalva maneuver, heart is said to be placed under an artificial physical stress condition. Under this artificial physical stress condition, the time and frequency domain of HRV parameters are evaluated.

• Journal of the Korean Society for Precision Engineering
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• v.18 no.5
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• pp.74-83
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• 2001

In this study, internal fatigue crack initiation and propagation behavior were investigated by triple piece spot welded specimen. To estimate fatigue life of the specimen varied with shape and thickness, Crack tip opening angle(CTOA) correlated with stress intensity factor was used as the stiffness parameter. The relation between fatigue life and CTOA can be arranged by the quantitative equation for each specimen by experiment. In addition, the variation of stress distribution was solved and the effect on fatigue crack behavior was examined by finite element method(FEM).

• Journal of Digital Convergence
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• v.18 no.4
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• pp.469-478
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• 2020

The purpose of this study was to investigate the effects of meditation therapy on stress relief and quality of life. The experimental group included 85 Sojucheon meditation members in Gwangju and Jeonnam, and the control group was a survey of 48 members including general office workers and beauty school students. One-way ANOVA was performed for the statistics of differences in study variables between the two groups. The results of the analysis showed a significant difference in stress, and the F test also showed a significant difference in quality of life. Therefore, most of the meditation practitioners have been found that meditation therapy has a positive effect on stress relief and quality of life. These results suggest that Sojucheon meditation therapy is effective in relieving stress and quality of life, and it can be said that it is sufficient to provide a reference of meditation therapy for psychological stability.

• The Korea Journal of Herbology
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• v.30 no.1
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• pp.43-49
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• 2015

Objectives : In this study, the anti-stress effects of ethanolic extract of Opuntiaficus-indica (OF70E) were investigated. Methods : To determine the effects of OF70E on physical stress, changes in whole-body cortisol level or behavior were monitored in zebrafish. After treatment with 0.9% saline or OF70E for 6 min, all fish underwent net handling stress (NHS), which induced physical stress. And then, we conducted open field test (OFT) or sacrificed fish for collecting body fluid from whole-body. We used the cortisol enzyme-linked immunoassay kit to measure the amount of cortisol in each zebrafish sample. Results : In result, compared with normal group which were not treated by NHS, whole-body cortisol levels were significantly increased in stressed-control group. Compared with control group, pretreatment with OF70E at concentrations of 25, 50 and 100 mg/L for 6min significantly inhibited the increase of whole-body cortisol levels induced by NHS(p<0.05). To anti-stress effects of OF70E on behavior, we conducted OFT after the induction of NHS following pretreatment of OF70E. As results of OFT, compared with unstressed-normal group, distance moved was significantly decreased by induction of NHS in stressed-control group (p<0.05). OF70E-pretreatment blocked decreases of distance moved increased by NHS (p<0.05). And meandering movement, immobility and turn angle were significantly increased by NHS in stressed-control group compared with unstressed-normal group (p<0.05). OF70E-pretreatment prevented the increases of meandering movement immobility and turn angle by NHS (p<0.05). Conclusions : In conclusion these results suggest that OF70E-pretreatment may prevent stress responses.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.20 no.5
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• pp.17-26
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• 2021

It is challenging to estimate the fatigue life of construction equipment consisting of a welded joint using field structure test owing to the uncertainty of the S-N curve. IIW recommends different S-N curves for various welded joint types. However, there is no way to define an appropriate curve considering complex design shape and strain gauge characteristics. This paper proposes an equivalent S-N curve method based on the relationship between IIW effective notch stress and virtual stress using finite element analysis. Moreover, a case study was conducted for the excavator fuel tank. The proposed method is expected to enhance accuracy and consistency in calculating the fatigue life for the welded structure of construction equipment.

• Proceedings of the Korean Society of Plant Biotechnology Conference
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• 2005.11a
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• pp.413-413
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• 2005

• Journal of the East Asian Society of Dietary Life
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• v.14 no.6
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• pp.542-550
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• 2004

This study was aimed for examining the changes of eating habit and behavior according to the degree of stress of elementary school students. It was tried to identify their daily stress levels and their relevances with the changes of their eating habits and behaviosr. The subjects were 500 students from fifth and sixth grades in three elementary schools in Seoul. The students surveyed showed to get moderately stressed in general. The stress level of girls were higher than that of boys(p<0.001) in the individual area. The breakfast ratio of the low stressed group(LS) marked higher(p<0.001) than those of both the middle-(MS) and highly-stressed group(HS). In other words, the LS group had regular breakfast. The main reason why they were skipping breakfast was lack of time. The amount of a meal in the HS group was noticeably bigger than the other two groups(p<0.05) and the amount of salt and spices used was higher(p<0.01). The amount of food taken when they got stressed was increased remarkably higher in the HS group and students in that group had snacks as the way of relieving the stress. The HS group displayed higher ratio of the unbalanced diet habit. There were noticeable differences in the eating habit and behavior, i.e. the amount of meals, of salt used and whether eating breakfast or not, in accordance of the levels of stress.