• Transactions of the Korean Society of Automotive Engineers
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• v.12 no.3
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• pp.109-121
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• 2004

This paper presents an optimal design method for structure-borne durability of a vehicle body structure. Structure-borne durability design requires a new design that can increase fatigue lives of critical areas in a structure and must prohibit transition phenomenon of critical areas that results from modification of the structure at the same time. Therefore, the optimization problem fur structure-borne durability design are consists of an objective function and design constraints of 2 types; type 1-constraint that increases fatigue lives of the critical areas to the required design limits and type 2-constraint that prohibits transition phenomenon of critical areas. The durability design problem is generally dynamic because a designer must consider the dynamic behavior such as fatigue analyses according to the structure modification during the optimal design process. This design scheme, however, requires such high computational cost that the design method cannot be applicable. For the purpose of efficiency of the durability design, we presents a method which carry out the equivalent static design problem instead of the dynamic one. In the proposed method, dynamic design constraints for fatigue life, are replaced to the equivalent static design constraints for stress/strain coefficients. The equivalent static design constraints are computed from static or eigen-value analyses. We carry out an optimal design for structure-borne durability of the newly developed bus and verify the effectiveness of the proposed method by examination of the result.

• Journal of Korean Academy of Nursing
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• v.36 no.2
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• pp.330-340
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• 2006

Purpose: This study was performed to investigate the factors influencing health behavior. Method: Data used in this study was drawn from a 2001 National Health survey done by Korea Institute for Health and Social Affairs. Number of samples were 5,085 people between age 20 years and 69 years in whole country. In this study, we modified Green and Kreuter's Precede-Proceed model to analyse influence of factors in health behavior, Hierarchical regression were used in the analysis. Result: 1) Factors that had statistically significant positive relation with overall health behavior were age, educational level, income level, disease in the family, medical examination, subjective weight, and concern about health, 2) Factors that had statistically significant negative relation with overall health behavior were sex, subjective health, stress, and degree of physical activity. Conclusion: 1) It would be necessary to set the target group for the health promotion in advance. 2) It was very important to adopt easy and efficient methods to change the health behavior of target group, for example, ability to control stress.

• Journal of dental hygiene science
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• v.17 no.5
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• pp.398-404
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• 2017

The present study aimed to examine the influence of mental health factors on oral health factors using data from the Korean National Health and Nutrition Examination Survey (KNHANES). A total of 1,548 elderly individuals aged over 65 years who completed the screening and health questionnaire were selected as the final study participants. The psychological health factors related to perceived oral health status were depression and stress when the gender was controlled, and in terms of gender, both elderly male and female individuals were stressed and depressed. These results suggested that the psychological health of elderly individuals negatively affects not only perceived oral health but also the quality of life. In addition, the psychological health of the elderly individuals should be systematically managed along with oral health care and overall health care and lifestyle. If a comprehensive health management system is available for low-income groups or an elderly person living alone, it should positively affect and improve the quality of life of elderly individuals.

• Journal of Korean Public Health Nursing
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• v.24 no.1
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• pp.82-92
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• 2010

Purpose: This study aimed to identify the incidence and risk factors of suicidal ideation among the elderly in Korea. Methods: This cross-sectional study used secondary data of the 2005 Korean National Health and Nutrition Examination Survey. The participants were 1,097 elderly Koreans who responded to the health survey. Sociodemographics, health related characteristics, and the prevalence of suicidal ideation were obtained through face-to-face interviews. Risk factors of the suicidal ideation were also examined. Descriptive statistics and multivariate logistic regression were used for data analysis. Results: Of the 1,097 respondents, 30.5% had suicidal ideation during the past year. Depression and stress were the important risk factors; others included mobility, pain/discomfort, chronic illness, smoking, sleep, and leisure time physical activity. Sociodemographic characteristics such as gender, education, and marital status affected suicidal ideation. Conclusion: The high frequency of suicidal ideation in the elderly suggests the necessity of community-based interventions directed at depression and stress.

• Journal of Industrial Technology
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• v.7
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• pp.49-58
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• 1987

To investigate the effect of the Retrogression and Reaging (RRA) treatment on the strength and the stress corrosion cracking in AA 7039 the measurement of hardness, tensile properties and the time to failure in a constant rate method were measured. Transmission electron microscope was used to examine the microstructural changes within graln and grain boundary. The results show that the RRA treatment of the T6 condition results in a significant increase in the time to failure without sacrifying the original T6 strength. It is believed that high density and even distribution of precipitates in RRA condition were observed within grain so that the RRA condition could have similar strength to the T6 condition. The presence of fine dispersion of semicohernt ${\eta}^{\prime}$ transition phase is also believed to contribute to that effect. Examination of the grain boundary microstructure shows that the RRA treatments increases significantly the average size of the grain boundary preciptates. It is suggested that the benificial effect of the RRA treatment on the susceptibility to SCC be due to the increase in the size of grain boundary precipitates obtained during the retrogression treatment.

• Korean Journal of Biological Psychiatry
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• v.23 no.1
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• pp.12-17
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• 2016

Neuroinflammation is one of important allostatic loads contributory to the various psychiatric illness. It is mediated mainly by glial cells, which produce both proinflammatory and antiinflammatory cytokines, and the balance of them determines the inflammatory process in the central nervous system. S100 calcium-binding protein B, which is used as an inflammatory marker is also released by glial cells. In the molecular level, oxidative stress contributes to the neuroinflammation. Their disturbances have been revealed in the psychiatric illness and related with the dysregulation of the glutamatergic and monoaminergic systems. There is a possibility to use them as disease markers. The approach for inflammation using antiinflammatory drugs and antioxidants could be connected to the development of disease-modifying treatments. Also, a searching examination about specific subtypes who are vulnerable to inflammation in the patients is required to confirm their efficacy clearly.

• Journal of Welding and Joining
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• v.21 no.5
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• pp.575-581
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• 2003

It has been well known that the ductile cracking of steel would be accelerated by triaxial stress state. Recently, the characteristics of critical crack initiation of steels are quantitatively estimated using the two-parameters, that is, equivalent plastic strain and stress triaxiality, criterion. This study is paid to the fundamental clarification of the effect of geometrical heterogeneity and strength mismatching, which can elevate plastic constraint due to heterogeneous plastic straining, and loading rate on ductile crack initiation behavior. Also, the ductile crack initiation testing were conducted under static and dynamic loading using round bar specimens with circumferential notch and strength mis-matching. The result showed that the nominal strain at ductile crack initiation of circumferential notch specimens small then the round bar specimens for effect of geometrical discontinuity. Also, the nominal strain at ductile crack initiation was decreased with decrease of notch root radius of curvature.

• Journal of Korean Public Health Nursing
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• v.27 no.3
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• pp.551-563
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• 2013

Purpose: This study was conducted in order to investigate the incidence and associated factors of suicidal ideation among the elderly according to residence area. Methods: This cross-sectional study used secondary data from the 2011 Korean National Health and Nutrition Examination Survey (KNHANES V-2). A representative sample of 1,464 men and women aged 65 and over was selected. Rao-scott $X^2$-test, multiple logistic regression models based on sampling scheme of the data were used. Results: Of the 1,464 respondents, 22.4% had experienced suicidal ideation during the past year. Higher incidence of suicidal ideation was observed in rural seniors (23.7%) than in urban seniors (21.1%). The incidence of suicidal ideation showed correlation with age, education level, depression, stress, lying in a sick bed, and current smoking status among elderly living in urban areas. However, among elderly living in rural areas, the incidence of suicidal ideation showed correlation with household income, depression, stress, and daily activity. Conclusion: Based on the results, nurses should manage effective and individualized nursing interventions for elders in planning suicide prevention programs with consideration for residence areas, because there were differences in the factors affecting suicidal ideation among elders according to residence area.

• Journal of Korean Neurosurgical Society
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• v.50 no.1
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• pp.54-56
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• 2011

Ankylosing spondylitis (AS) is frequently associated with inflammatory lesions of the spine and continuous fatigue stress fractures; however, an association with an intraspinal synovial cyst has not been previously reported. A 55-year-old man with a five year history of AS who presented with back pain and a right radiculopathy was admitted to the hospital. Five years previously, he underwent a percutaneous vertebroplasty for an osteoporotic L1 compression fracture, and was diagnosed with AS at that time. Plain radiographs showed aggravated kyphosis and a stress fracture through the ossified posterior element, below the prior vertebroplasty. Magnetic resonance images revealed a right foraminal cystic lesion at the L2-L3 level with effacement of the nerve root. A 1.6 cm cystic lesion that appeared to arise from the L2-L3 facet joint without direct communication was excised from the L2-L3 foramen. Pathological examination confirmed synovial cyst. The patient's symptoms resolved immediately after surgery except for a mild dysesthesia of the right leg. We report herein a rare case of foraminal synovial cyst associated with AS accompanying posterior element fracture with a review of literature.

• Proceeding of Spring/Autumn Annual Conference of KHA
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• 2005.11a
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• pp.367-370
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• 2005

Offer of medical treatment service for recovery or preservation of physical spiritual function of elderly people by sudden population graying developing is essential. Therefore, according to increase of elderly's medical treatment demand, medical treatment service request is augmented. Number of medical treatment service utilization wishes to grope medical treatment service support way for elderly residing cloth elevation laying stress on elderly's Aging in Place in increase trend in this research. If decide, is as following : First, national hospital and public health center were concentrated most on Seoul and kyonggi, and there were many hospitals to south of a river nine, Songpagu, Seochogu, and public health center was expose that is one by one to each nine. Second, in the case of Seoul, elderly population ratio was expose that comparatively high Yeongdeungpo, Chongno, Yongsan, west passage nine is few hospital number relatively in elderly's residential area. Third, need that establish elderly full text clinic on part of general hospital or university hospital equipment. Fourth, must do so that can use access as is easy little more in local community to all elderly who need medical treatment service of visit nursing, visit medical examination and treatment etc.. that consist in present public health center.