• Korean journal of food and cookery science
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• v.28 no.3
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• pp.311-318
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• 2012

The correlation between osteoporosis and reactive oxygen species (ROS)-induced oxidative stress was investigated. Thus, interest in food and plants with antioxidant effects that can reduce damage caused by ROS during bone metabolism is heightening. In this study, the antioxidant effect of Taraxacum mongolicum on proliferation and differentiation of MC3T3-E1 cells under H2O2-induced oxidative stress was studied to investigate its protective effect against oxidative stress and its availability as an antioxidant material related to bone diseases. As a result, total polyphenol and total flavonoid contents of T. mongolicum were 33.65 mg/g and 4.45 mg/g, respectively. The T. mongolicum extract increased proliferation of both MC3T3-E1 cells and differentiated osteoblasts under $H_2O_2$-induced oxidative stress conditions. In addition, two differentiation markers, alkaline phosphatase activity and mineralization level in the T. mongolicum extract, tended to increase. These results indicate that T. mongolicum extract suppressed the damage to osteoblasts under oxidative stress and that it is potential antioxidant materials for preventing bone diseases.

• The Journal of Korean Medicine
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• v.17 no.1 s.31
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• pp.146-170
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• 1996

This study aimed to evaluate the anti-stress effects of Walgukhwan, Walgukhwan+Ejintang and Wal gukhwan+Samultang. The experimental animals treated with each extracts during 15 days before the immobilization stress. And each experimental animals were endowed with 12 hours immobilization stress. Then the brain, blood and urine catecholamine contents and serum total cholesterol, triglyceride and free fatty acid levels were studied. The result were as followed; 1. Walgukhwan, Walgukhwan+Ejintang and Walgukhwan+Samultang were not statistically effective to the changes of the body weight. 2. Walgukhwan was statistically effective to the increase of the blood norepinephrine content as compared with control. 3. Walgukhwan+Ejintang was statistically effective to the increase of the blood and urine norepinephrine contents as compared with control. 4. Walgukhwan+Samultang was statisticallv effective to the increase of the brain, blood and urine norepinephrine contents and also to the increase of the blood and urine dopamine contents as compared with control. 5. Walgukhwan was statistically effective to the increase of the serum free fatty acid level as compared with control. 6. Walgukhwan+Ejintang was statistically effective to the increase of the serum triglyceride and free fatty acid levels as compared with control. 7. Walgukhwan+Samultang was statistically effective to the increase of the serum total cholesterol, triglyceride and free fatty acid levels as compared with control.

• Journal of the Korean Crystal Growth and Crystal Technology
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• v.23 no.2
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• pp.76-80
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• 2013

For further improvement of osseo-integration of bone crystal with a dental implant, a design optimization study is carried out for various holes inside its body to deliver bioactive materials and the effect of bioactive material injection on the bone crystal growing. When bioactive material is absorbed, the bone crystal can grow into holes, which would increase the strength of implant bonding as well as a surface integration. The stress concentrations near the uppermost outlet holes were reduced with increasing the number of outlet holes. A design improvement in the uppermost outlet was shown to be effective in reducing the stress concentration. For design parameters under consideration in this study, total area of outlet of 6.38 $mm^2$ and maximum stress of 1.114 MPa, which corresponds to type 6-C. It is due to the minimization of maximum stress and total area of outlet. The design of the outlet facing down was more effective in reducing the maximum stress value compared with a horizontal symmetry.

• Journal of Biomedical Engineering Research
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• v.15 no.2
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• pp.183-188
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• 1994

In clinical orthopaedics, bone resoption in the cortex is often seen post operatively on X-rays or bone densitometry after total hip replacement (THR) in the form of cortical osteoporosis or atropy. Stress shielding of bone occurs, when a load, normally carried by the bone alone, is shared with an implant as a result, the bone stresses are abnormal and with remodelling analysis this may cause extensive proximal bone resoption, possibly weakening the bone bed to the point of failure. The author made finite element models of the cemented and non-cemented type implanted femoral stem with bone resorption of the proximal medial femur and studied the feed back effect of the various degree of bone resoption to THR system by parametric analysis on the stress of the femoral stem and interface. The results of the present finite element analysis implied that the extent of proximal bone resorption has the effect of more increasing stress on the distal stem tip, cement mantle and interface in both type of femoral stem and this high distal stress possibly can cause the mechanical failure of loosening or failure after THR.

• Journal of East-West Nursing Research
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• v.28 no.1
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• pp.57-66
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• 2022

Purpose: This study examined the effect of emotional intelligence, job stress, and communication ability on nursing performance of nurses caring for cancer patients. Methods: This is a descriptive study involving 185 nurses with an experience of longer than 6 months at K university hospital in B metropolitan city. The data was collected from March 2nd 2021 to March 31st 2021, and analyzed using the descriptive statistics, independent t-test, one-way ANOVA, Pearson correlation coefficients, and stepwise multiple regression. Results: The factors affect the nursing performance of participants were emotional intelligence, total clinical career, communication ability, job stress and satisfaction of current department. The total explanatory power of those variables on the nursing performance was 43.8%. Conclusion: In order to improve nursing performance, it is necessary to apply a program for improving emotional intelligence and communication ability, and for controlling and coping with job stress, considering the career of a nurse taking care for cancer patients. In addition, efficient manpower management and material support at the hospital organization level are required.

• Korean Journal of Environmental Biology
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• v.41 no.4
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• pp.539-549
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• 2023

This study examined the impact of two bacterial strains, H05E-12 and H05R-04, on alleviating non-irrigation-induced stress and its subsequent effects on the fruit productivity of sweet pumpkin plants. When subjected to non-irrigation-induced stress, the lipid peroxidation, proline, total phenol, and total soluble sugar content significantly decreased in plants treated with either H05E-12 or H05R-04 compared to the control. In a greenhouse experiment under non-irrigated conditions, H05E-12-treated plants exhibited higher stomatal conductance than the control, although there was no significant change in the soil plant analysis development(SPAD) value due to treatment. Upon re-watering, an increase in fruit diameter was observed in H05E-12-treated plants, and the L-ascorbic acid content in the fruit also showed a significant increase compared to the control. The H05E-12 strain was identified as Kushneria konosiri. To the best of our knowledge, this is the first report detailing the beneficial effects of K. konosiri on the alleviation of non-irrigation-induced stress and the promotion of plant growth in sweet pumpkin plants.

• Journal of East-West Nursing Research
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• v.21 no.1
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• pp.36-42
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• 2015

Purpose: This study was conducted to identify the level of job stress and to determine factors influencing job stress among nurses currently under Academic Credit Bank (ACB) system. Methods: The participants were 153 nurses who has taken courses of ACB system. Data were collected through self-report questionnaires and then analyzed with t-test, ANOVA, Pearson correlation coefficients, and multiple linear regression with SPSS/WIN 18.0. Results: The score of job stress showed significant differences according to age, marital status, total period of clinical career, and nursing unit. Job stress had significant negative correlation to professional self-concept and organizational commitment. The factors influencing job stress were marital status, professional self-concept, and organizational commitment. Conclusion: The results suggest that various factors should be considered in development and implementation of programs to reduce the job stress of nurses currently under ACB system.

• Journal of Technologic Dentistry
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• v.16 no.1
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• pp.105-113
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• 1994

This study attempted to find out how much stress Dental Technicians of working in Dental Laboratory have built up in the midst of their daily lives are according to their sex, age, duration of work and their kinds of positions. After self-administered questionnaire were distributed by direct to 230 technicians samplely selected from dental laboratories in Seoul and Pusan of whom 163 technicians responded from october 1 through october 13, 1994. Analysis of the data was processed by t-test, $X^2$-test, ANOVA. This results are as follows. 1. Levels of Stress of the total 163 respondents by sex is not higher among male than female(p>.05). 2. Levels of stress - 36.2%(74 Dental technicians) of all Dental technicians were in stress on the whole and 9.2%(15 Dental technicians) of them were in a serious situation by accumulated stress. 3. Realization of stress - 10.1%(16 Dental technicians) of the dental technicians and 89.9%(143 Dental technicians) were found out to be in a dangerous sign or in a situation by accumulated stress. Further studies which a big size and a delicate method of measuring their general characteristics are needed.

• Journal of the Korean Society of Safety
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• v.37 no.1
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• pp.64-69
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• 2022

The study measured a subway construction worker's Macpa stress by Heart Rate Variability measuring instrument and conducted a survey of Korean job stress from subway construction workers. Also, the study analyzed the relationship between Macpa stress index and Korean job stress result and suggested managing stress method for each item. According to National Statistical Office data, the first line subway in Seoul was started to open in 1974. The extended total length is 996 kilometers until 2019. Many aged workers are currently working at subway construction sites due to the avoidance of young workers since the past until now. It means that the elderly has a substantial portion among subway construction workers. The productivity has been adversely affected by health problems due to the aging of workers, job stress due to heavy work, and personal health problems. So, the regulation and policies on job stress health management are being strengthened. The data were measured Macpa stress by machine measuring heart rate variability and conducted Korean job stress survey(shortened) from Sa-sang to Ha-dan line Busan subway construction workers for analyzing the relationship. Independent variable were age, job duration, job position, employment type, working type in this study. Macpa's dependent variable was stress index and Korean job stress survey(shortened)'s dependent variables were job requirements, job autonomy, relationship conflict, job instability, organizational structure, inappropriate compensation, working place culture, and total score. SPSS 12.0 K Statistics Program was used for statistical analysis. Kruskal-wallis test, a nonparametric statistical analysis, was used because the data are difficult to be assumed as normal distribution. As a result, the paper indicated the significant correlation between Macpa stress index and Korean job stress(short version). The elderly workers presented higher Macpa index and higher job stress due to aging and heavy-duty work. The majority workers were daily workers who had unstable working condition and uncertainty about the future. The study suggested a manual that could reduce job stress for subway construction workers and future study deriving management tool through analyzing job stress factor is necessary.

• Journal of the Korean Society of Food Culture
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• v.35 no.5
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• pp.483-492
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• 2020

Dietary components can modulate stress, inflammatory indicators, and health risk. This study examined the relationship among diet, metabolic disease risk, and perceived stress in Korean adult females using the 2017-2018 Korea National Health and Nutrition Examination Survey. A total of 4,353 adult women aged 19-64 years were classified into four groups according to perceived stress level: very high stress group (VHSG, n=225), high stress group (HSG, n=1,079), moderate stress group (MSG, n=2,532), and low stress group (LSG, n=517). Data collection included the sociodemographics, anthropometrics, blood profile, and dietary survey. After adjusting for covariates, those in the VHSG had a higher body mass index (p=0.013) and obesity rate (p=0.053) with a shorter sleep time than the LSG group. The VHSG also tended to have a higher plasma LDL-cholesterol, hsC-reactive protein and lower levels of HDL-cholesterol, vitamin A, and vitamin E than the low stress group. High stress subjects demonstrated increased breakfast skipping frequency (p<0.0001), decreased fiber intake (p=0.001), potassium (p=0.041), and vitamin A (p=0.011) than the low stress ones. Therefore the perceived stress level was associated with the inflammatory indicators, obesity, and lack of anti-inflammatory or antioxidant nutrients. The dietary components may be an important mediator of stress and metabolic disease.