• Food Science of Animal Resources
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• v.40 no.1
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• pp.1-10
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• 2020

Various processing methods have a great impact on the physiochemical and nutritional properties of meat that are of health concern. Hence, the postmortem processing of meat by different methods is likely to intensify the potential effects on protein oxidation. The influence of meat protein oxidation on the modulation of the systemic redox status and underlying mechanism is well known. However, the effects of processed meat proteins isolated from different sources on gut microbiota, oxidative stress biomarkers, and metabolomic markers associated with metabolic syndromes are of growing interest. The application of advanced methodological approaches based on OMICS, and mass spectrometric technologies has enabled to better understand the molecular basis of the effect of processed meat oxidation on human health and the aging process. Animal studies indicate the involvement of dietary proteins isolated from different sources on health disorders, which emphasizes the impact of processed meat protein on the richness of bacterial taxa such as (Mucispirillum, Oscillibacter), accompanied by increased expression of lipogenic genes. This review explores the most recent evidences on meat processing techniques, meat protein oxidation, underlying mechanisms, and their potential effects on nutritional value, gut microbiota composition and possible implications on human health.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.58 no.4
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• pp.725-734
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• 2009

Maxwell stress tensor is one of the methods which are generally used for electromagnetic force calculation. In this paper, it is presented that Maxwell stress tensor T and n${\cdot}$T have no physical meaning and therefore should not be used as sources of mechanical force for deformations or dynamics. The divergence of Maxwell stress tensor ${\nabla}{\cdot}T$ is the one which can acquire a physical identity and is electromagnetic body force density by an action at a distance like a gravity. This result can be derived from the principle of power balance, and also verified by some thought experiments. The virtual air-gap approach is proposed as a valid solution for the calculation of the body force.

• Journal of Korean Academy of Nursing
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• v.32 no.4
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• pp.570-579
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• 2002

This research study explores the job stress, job satisfaction, and health of women who works in the professional work place and identify the influence of the job stress and job satisfaction on the mental health status focused on the social and psychological structure of the workplace. Method: 535 participants of registered nurses and teachers from 10 General Hospitals and 15 Middle and High School located in Seoul, Korea were completed the modified version of the short form Work-family stress inventory of questionnaire as used for job stress and mental health problems and perceived overall health status and job satisfaction. Result: Job stress was significantly correlated with job satisfaction, overall health, and mental health. There were also significant group differences in job stress and job satisfaction between nurses and teachers. Multiple regression only moderately supported the effect of job stress and job satisfaction on the mental health of professional working women. Also marital status demonstrated a significant factor of group differences in job stress, work-family stress, job satisfaction, and mental health problem. Conclusion: These results suggest that job stress in the work place has profound impact on job satisfaction and health of women who work in the professional job. This study also identified major sources and types of work-related stress on women's health which should be considered in a management for health promotion.

• Journal of the Korean Home Economics Association
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• v.38 no.9
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• pp.93-106
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• 2000

The Purpose of this study was to examine the adolescents'stress and social supports and the relationships of there two factors. Specifically, this study investigated the adolescents'stress and social supports depending on their sex, family status, socio-economic status. The subjects of this study were 467 middle school students in Pusan. Questionnaires were used consisting of adolescents'perceived stress and social supports for data analysis, Cronbach's $\alpha$-coefficient, frequency distribution, percentage, Oneway-ANOVA, t-test and Pearson's γ-coefficient were used. Major findings were as follows: Adolescents'stress were significantly different depending on their sex, father's educational level, family income and family intimacy The source of the adolescents'social support sources were different depending on their sex, family status, father's educational level, mother's educational level, family income and family intimacy. Adolescents'social support types were different depending on family status, lather educational level, mother educational level, father\`s job, family income and family intimacy. There were negative correlation between stress and social supports.

• Journal of Home Health Care Nursing
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• v.19 no.2
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• pp.195-203
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• 2012

Purpose: This study is conducted to investigate the stress level, stress source and stress coping of nursing students in college. Methods: This study was a cross sectional survey and the data was collected from 341 nursing students by means of self-reported questionnaires from April 2 to May 31, 2012. Collected data were analyzed on SPSS win 18.0. Results: The nursing students experienced moderate levels of stress. The source of stress for students came from 'one's own self'. The most common stress coping used by students was 'make a wish'. There were significant differences in the source of stress and the stress coping according to the nursing students' year of school and other general characteristics, such as motivation of entrance and satisfaction in school life. Conclusion: These results suggest that it is important to develop stress management program and strategies based on nursing students' individual characteristics and sources of stress.

• Journal of the Korean Society for Precision Engineering
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• v.27 no.4
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• pp.79-86
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• 2010

Mechanical structures with power sources experience repeated force produced by motors. In result, the life of the pipes reduces and ultimately, the pipes collapse. Such pipes are formed into several shapes and particularly, the U-shape pipe is damaged frequently. In most cases, the U-shape pipe is made with a straight pipe by complicated bending work. During this work process, plastic deformation of the pipe produces residual stress in the pipe. This residual stress significantly affects the fracture behavior of the pipe and induces the change of the stress ratio (min. stress/Max. stress = R). For this reason, residual stress has to be evaluated. In this paper, the residual stress of a U-shaped pipe was evaluated by FEM analysis. In addition, fatigue tests of the U-shaped pipe were performed by using a uniaxial fatigue testing machine. The results of the fatigue test were modified with the results of FEM (Finite Element Method) analysis for residual stress. The modified fatigue test results of the U-shaped pipe were compared with those of a straight pipe.

• Journal of the East Asian Society of Dietary Life
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• v.7 no.1
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• pp.13-20
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• 1997

This study was designed to determine the effects of protein sources on the curation of gastric ulceration, protein metabolism, and nitrogen balance in rats with gastric ulcer induce by restraint and water immersion stress. After the rats were fed 10% casein diet for 3 weeks, four groups of the rats were forced in 5$\times$5$\times$15cm plexiglass cage. The restraint and water immersion stress was carried at 20$\pm$2$^{\circ}C$ for 8-hour. The other one group(control group) was not exposed to stress. After stress 4 kinds of different diets containing 20% protein were given for 5 days. The protein sources were casein, whey protein, soy protein, gluten. The control group was fed to 10% casein diet. The results were as follows ; the weights of rats were not different among the diet groups During the experiment period follows ; the weights of rats were not different among the diet groups during the experiment period (for 5 days). The ulcer index of rats fed 10% gluten and soy protein diet was significantly higher than those of casein and whey protein diet groups(p<0.05). The level of serum albumin was not significantly different among diet groups. But hematocrit and the level of $\alpha$-amino-N, BU and UUN of plant protein diet groups were higher than animal diet groups, the urinary hydroxyproline of soy protein group was the highest and the whey protein was the lowest. The digestibility and BV of nitrogen of gluten diet group were significantly higher than those of casein and whey protein diet groups(p<0.05). The animal proteins had more curative effects of ulcer than plant animals. The results of this study provide useful information concerning diet therapy for the patients with gastrointestinal diseases and the field of enteral diet materials.

• Corrosion Science and Technology
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• v.3 no.3
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• pp.112-117
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• 2004

This work investigated the material properties of Ni-P-B alloy electrodeposits obtained from a Ni sulfamate bath as a function of the contents of the P and B sources($H_3PO_3$ and dimethyl amine borane complex(DMAB), respectively) with/without additives. Chemical composition, residual stress, microstructure and micro hardness were investigated using ICP(inductively coupled plasma) mass spectrometer, flexible strip, XRD, TEM and micro Vickers hardness tester, respectively. From the results of the compositional analysis, it was observed that P and B are incorporated competitively during the electrodeposition and the sulfur from the additive is codeposited into the electrodeposit. The measured residual stress value increased in the order of Ni, Ni-P, Ni-B and Ni-P-B electrodeposits indicating that boron affects the residual tensile stress greater than phosphorus. As the contents of the alloying element sources of P and B increased, crystallinity and the grain size of the electrodeposit decreased. The effect of boron on crystallinity and grain size was also relatively larger than the phosphorus. It can be explained that the boron with a smaller atomic radius contributes to the increase of residual stress in the tensile direction and the larger restraining force against the grain growth more significantly than the phosphorus with a larger atomic radius. Introduction of an additive into the bath retarded crystallization and grain growth, which may be attributed to the change of the grain growth kinetics induced by the additive adsorbed on the substrate and electrodeposit surfaces during electrodeposition.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.29 no.4 s.235
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• pp.526-533
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• 2005

Reliability problem in inkjet printhead, one of MEMS devices, is also very important. To eject an ink drop, the temperature of heater must be high so that ink contacting with surface reaches above $280^{o}C$ on the instant. Its heater is embedded in the thin multi-layer in which several materials are deposited. MEMS processes are the main sources of residual stresses development. Residual stress is one of the factors reducing the reliability of MEMS devices. We measured residual stresses of single layers that consist of multilayer. FE analysis is performed using design of experiment(DOE). Transient analysis for heat transfer is performed to get a temperature distribution. And then static analysis is performed with the temperature distribution obtained by heat transfer analysis and the measured residual stresses to get a stress distribution in the structure. Although the residual stress is bigger than thermal stress, thermal stress is more influential on fatigue life.

• Child Health Nursing Research
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• v.28 no.4
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• pp.269-279
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• 2022

Purpose: This study investigated the factors that influence parenting stress, including hardiness, parent-child interactions, and social support, to provide basic data for developing a program to reduce parenting stress in North Korean refugee mothers. Methods: A descriptive study design was used. Data were collected between September and December 2021, and 123 North Korean refugee mothers participated. Results: The mean scores were 69.42 out of 135 for hardiness, 48.45 out of 144 for interactions, 47.32 out of 90 for social support, and 51.84 out of 90 for parenting stress. The parental distress score was higher than that of child-related stress. Hardiness was significantly related to North Korean refugee mothers' parenting stress. Multiple regression analysis indicated that the explanatory power for hardiness and the number of supporters was approximately 19% for parenting stress (F=6.84, p<.001). As such, the factors with a relatively strong influence on parenting stress were hardiness (β=-.40, p<.001) and having four or more supporters (β=-.27, p=.027). Conclusion: This study's findings suggest the need to identify ways to increase North Korean refugee mothers' psychological hardiness and encourage them to extend their sources of social support and enhance their style of parenting.