• Proceedings of the Korean Society of Precision Engineering Conference
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• 2009.06a
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• pp.355-356
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• 2009

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2008.06a
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• pp.103-104
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• 2008

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2011.06a
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• pp.1459-1460
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• 2011

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2011.06a
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• pp.1605-1606
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• 2011

• Polymer(Korea)
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• v.38 no.6
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• pp.815-819
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• 2014

Scaffolds of tissue engineering should be biocompatible and biodegradable for cell attachment, proliferation and differentiation. In the various scaffold fabrication, 3D printing technique can make the three dimensional scaffold with interconnected pores for cell ingrowth. Polycaprolactone (PCL) is biodegradable polyester with a low melting temperature and has been approved by the Food and Drug Administration (FDA). In this study, PCL scaffold was fabricated by 3D bioprinting system and surface modification of PCL scaffold was controlled by NaOH treatment. Morphological change and wetability of NaOH-treated scaffold were observed by SEM and contact angle measurement system. The remnant of PCL treated with NaOH was measured by ATR-FTIR. In vitro study of scaffolds was evaluated with WST-1 and ALP activity assay. NaOH treatment of PCL scaffolds increased surface roughness, hydrophilicity, cell proliferation and osteogenic differentiation. These results indicate that NaOH-treated PCL scaffold made by 3D bioprinting has tissue engineered potential for the development of biocompatible material.

• Journal of Korean Academy of Fundamentals of Nursing
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• v.16 no.4
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• pp.515-523
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• 2009

Purpose: The purpose of this study was to examine the relationship between work-family conflict, social support, job satisfaction, and organizational commitment which are closely linked to staff turnover from the perspective of married hospital nurses. Method: A survey was conducted using self-report structured questionnaire from 220 married nurses. Data analysis included descriptive statistics, t-test, one-way ANOVA, correlation and multiple linear regression with SPSS Win 17.0 program. Results: Job satisfaction, social support, work-family conflict and age were strong predictors of organizational commitment. These variables explained 46.5% of the variance of the organizational commitment. Higher levels of organizational commitment were associated with greater job satisfaction and social support. Nurse with lower levels of work-family conflict and older age reported a high level of organizational commitment. Conclusion: These results show that improving job satisfaction has the best effect on enhancing nurses' organizational commitment. Also supportive relationships, reduction of work-family conflict and older age were significantly correlated with organizational commitment. Organizations should design more family-friendly policies and provide opportunities for career development to health professionals to induce organizational commitment.

• Journal of Korean Academy of Nursing Administration
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• v.22 no.3
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• pp.303-312
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• 2016

Purpose: The purpose of this study was to identify relationships among self-esteem, social support, nursing organizational culture, experience of workplace bullying, and the consequences of workplace bullying in hospital nurses, and then to provide basic information for developing workplace bullying prevention programs. Methods: Participants were 122 hospital nurses from three general hospitals. Data collection was done during April and May 2015. Data were collected using self-report questionnaires which were used to identify participants' characteristics, self-esteem, social support, nursing organizational culture, and workplace bullying. Results: Approximately one quarter of the nurses had experienced workplace bullying in the past six months. Hierarchical regression analysis showed that experience of workplace bullying (${\beta}=.45$) and self-esteem (${\beta}=-.31$) explained 53.3% of the variance in consequences of workplace bullying. Conclusion: Based on the findings that experiencing workplace bullying and having a low self-esteem were likely to increase workplace bullying in hospital nurses, there is a need to develop prevention and intervention programs on avoiding or dealing with workplace bullying.

• Journal of Korean Academy of Nursing
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• v.33 no.2
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• pp.265-274
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• 2003

Purpose: The purpose of this study is to investigate the role of social support in the experience of job stress among hospital nurses. Method: This study was carefully designed to overcome methodological shortcomings found in past research, and examined two organizational effectiveness variables(job satisfaction and organizational commitment) as outcome variables. The sample used in this study consisted of 602 nurses from 5 general hospitals. Data were collected with self-administered questionnaires and analyzed using hierarchical regression and LISREL technique. Result: It was found that: (a) three job stress variables(workload, role conflict and conflict with other medical staff) have negative effects on job satisfaction and organizational commitment; (b) social support have positive main effects on the two output variables; (c) the negative effects of job stress variables on job satisfaction and organizational commitment are not buffered by social support, and (d) social support mediates the effects of job stress on job satisfaction and organizational commitment, and the size of the mediating effects is small. Conclusion: Further research needs to be done to further refine this study.

• Proceedings of the KSME Conference
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• 2007.05a
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• pp.1265-1270
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• 2007

Conventional methods for fabricating three-dimensional (3-D) scaffolds have substantial limitations. In this paper, we present 3-D scaffolds that can be made repeatedly with the same dimensions using a microstereolithography system. This system allows the fabrication of a pre-designed internal structure, such as pore size and porosity, by stacking photopolymerized materials. The scaffolds must be manufactured in a material that is biocompatible and biodegradable. In this regard, we synthesized liquid photocurable biodegradable TMC/TMP, followed by acrylation at terminal ends. And also, solidification properties of TMC/TMP polymer are to be obtained through experiments. Cell adhesion to scaffolds significantly affects tissue regeneration. As a typical example, we seeded chondrocytes on two types of 3-D scaffold and compared the adhesion results. Based on these results, the scaffold geometry is one of the most important factors in chondrocyte adhesion. These 3-D scaffolds could be key factors for studying cell behavior in complex environments and eventually lead to the optimum design of scaffolds for the regeneration of various tissues, such as cartilage and bone.

• Journal of muscle and joint health
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• v.7 no.1
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• pp.25-39
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• 2000

This study was conducted to compare symptoms, living activities, self-efficacy and family support between rheumatoid arthritis patients and fibromyalgia patients. The subjects were consisted of 150 rheumatoid arthritis patients and 125 fibromyalgia patients at H Rheumatism Clinic. Data were collected by means of structured interview with questionnaires. The results were as follows: 1. Fibromyalgia patients have more symptoms than rheumatoid arthritis patients have. But the latter has more difficulties concerning living activities. 2. Self-efficacy score of fibromyalgia arthritis patients was higher than that of rheumatoid arthritis patients, but both the scores were at moderate level. 3. The level of family support of rheumatoid arthritis patients was moderate, similar as that of fibromyalgia patients. As self-efficacy and family support are important factors to relieve symptoms of both diseases, their promotion holds a key post.