• Restorative Dentistry and Endodontics
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• v.35 no.1
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• pp.13-19
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• 2010

The purpose of this study was to compare the microshear bond strength of a self-etching primer adhesive to dentin prepared with different diamond points, carbide burs and SiC papers, and also to determine which SiC paper yield similar strength to that of dentinal surface prepared with points or burs. Fifty-six human molar were sectioned to expose the occlusal dentinal surfaces of crowns and slabs of 1.2 mm thick were made. Dentinal surfaces were removed with three diamond points, two carbide burs, and three SiC papers. They were divided into one of eight equal groups (n = 7); Group 1: standard diamond point(TF-12), Group 2: fine diamond point (TF-12F), Group 3: extrafine diamond point (TF-12EF), Group 4: plain-cut carbide bur (no. 245), Group 5: cross-cut carbide bur (no. 557), Group 6 : P 120-grade SiC paper, Group 7: P 220-grade SiC paper, Group 8: P 800-grade SiC paper. Clearfil SE Bond was applied on dentinal surface and Clearfil AP-X was placed on dentinal surface using Tygon tubes. After the bonded specimens were subjected to uSBS testing, the mean uSBS (n = 20 for each group) was statistically compared using one-way ANOV A and Tukey HSD test. In conclusion, the use of extrafine diamond point is recommended for improved bonding of Clearfil SE Bond to dentin. Also the use of P 220-grade SiC paper in vitro will be yield the results closer to dentinal surface prepared with fine diamond point or carbide burs in vivo.

• Journal of the Korean earth science society
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• v.22 no.5
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• pp.339-349
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• 2001

The aim of this study is to explore effective teaching strategies through an investigation of the problem-solving abilities and reasons for the unsuccessful problem solving of pre-service teachers. The participants of the study were 60 pre-service teachers who were expected to teach earth science in elementary school (40) and secondary school (20). The participants had taken a course in astronomy before they took part in the present study. The instruments for the study were a paper-and-pencil test and interviews. The results demonstrated that the pre-service teachers' abilities to solve problems were low. The pre-service teachers of the elementary school were inferior to those of the secondary school in their problem solving abilities. The causes for the unsuccessful problem solving were identified as follows: (1) lack of prerequisite knowledge to understand the motions of the moon and the planets, (2) failure to represent problems based on solution principles, (3) failure to apply the knowledge acquired in one setting to another, different setting, (4) frames of reference the frameworks for everyday life situation and for earth science problem situation, and (5) rote-memorization of facts rather than understanding the cause-and-effect relationships. The above causes for unsuccessful problem solving seemed to be related to the characteristics of novice problem solvers in general and of the tasks about the motions of the moon and the planets. Suggestions are made to enhance pre-service teachers' problem solving abilities based on the result of the study.

• Korean Journal of Human Ecology
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• v.6 no.1
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• pp.15-27
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• 1997

The purpose of this study was to examine the effects from social supports and global self-worth on stresses for the children. The subjects were 438 children of the 5th grade in Elementary School and the first grade in Junior High School in Taejeon. The instruments used for this study were Children's Social Support, Global Self-Worth and Stress Scale. The data were analyzed using t-test, Pearson's correlation, multiple regression and path analysis. The main results of the study were as follows; 1. The stresses were different depending on age. When the family and the teacher give higher social supports, the 5th graders have higher global self-worth. When the family gives higher social supports, the stresses were decreased for the 5th graders. When the children have higher global self-worth, the stresses were decreased. 2. When the first graders in Junior High School experienced higher global self-worth and social supports from their friends, family, teacher, the stresses were decreased. 3. The first graders in Junior High School experienced more stresses than the 5th graders in Elementary School in parent-related and academic-related domains. But the first graders in Junior High School experienced less stresses than the 5th graders in Elementary School in friend-related domains. 4. The path analysis showed that social supports from friends and family explained 15% of the stresses for the 5th graders in elementary school. Social support from friends, family, and teacher explained 28% of the stresses for the first graders in Junior High School. 5. For the 5th graders in Elementary School, social supports from friends and family had direct influences on the global self-worth. And the global self-worth had direct influence on children's stresses. But for the first graders in Junior High School, social supports from friends, family, and teacher had direct influences on the global self-worth. And the social supports from friends had direct and indirect effects on children's stresses. 6. For predicting the stresses, the most significant variable was the global self-worth for the 5th graders in Elementary School and the first graders in Junior High School.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.6
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• pp.503-512
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• 2017

The perceived stress of pregnant women is a potential contributor to adverse birth outcomes. Although the importance of the psychosocial well-being of pregnant women has been emphasized, there are fewreliable and valid instruments to measure the stress level of pregnant women in Korea. This study evaluated the psychometric properties of Ahn's pregnancy related stress scale (PSS) that was originally developed in 1984. Two hundred pregnant women completed the survey questionnaire, which was comprised of the PSS, depression scale, and demographic information. Principal component analysis and confirmatory factor analysis was used to test the construct validity. The concurrent validity was evaluated using the correlation with depression scores. Based on exploratory factor analysis and a consideration of conceptual meaning, a five-factor structure was extracted, explaining 57.25% of the variance: physical discomfort, fetus, parenting, spouse relationship, and housework. The goodness-of-fit indices showed an acceptable fit overall with the full model and acceptable internal consistency (Cronbach's alpha =.89). The concurrent validity was confirmed by a comparing with the depression score (r=.48, p <.001). The shortened PSS, as a valid and reliable scale, is recommended to be used to assess pregnancy-related stress and to develop stress managing interventions for pregnant women in clinical settings.

• Women's Health Nursing
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• v.8 no.1
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• pp.20-33
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• 2002

The purpose of this study is to afford basic data for planning a program to strategically prevent adolescent sexual violence by clarifying the concept of sexual violence in adolescence and investigating factors influencing the adolescent attitudes towards sexual violence. Subjects of the study were 288 adolescents between the ages of 14 to 21, living in K city in Chungnam Province. The data was collected for this study between May 30 and June 13, 2001. For this study, the following materials were used as instruments: the types of attitudes toward sexual violence developed by Nam, S. Y.(2000), the antisocial personality by Min, B. K., Choi, S. J., & Lee, G. H.(1978), the self-esteem developed by Rosenberg(1965) and interpreted by Jeon, B. J.(1974), the family support developed by Cobb(1976), the stereotyped sex role and the attitude on sexuality by Kim, E. J.(1997). The data was analyzed, using SPSS 7.5 for Windows Program, descriptive statistics, t-test, ANOVA, and discriminant analysis. The results of this study were as follows: 1. Adolescents of the first type, ones blaming social morals, amounted to 34.7%(100 subjects), the second type, ones blaming the victims, amounted to 22.3%(64 subjects), the third type, ones claiming reform of consciousness, amounted to 25.3%(73 subjects), and the fourth type, ones coping actively, amounted to 17.7%(51 subjects). 2. Attitudes toward sexual violence were influenced a great deal by the sex of the subject. 3. The study revealed that various types of the attitudes toward sexual violence was significantly different from one another, related to antisocial personality(F=2.80, P=.04). Especially the first type and the third type were most different from each other. The latter showed the antisocial personality strongly, compared with the former. 4. Discriminant analysis revealed that the most powerful predictors of attitudes toward sexual violence were the sex of the subject and whether or not they had an antisocial personality. 5. The degree of possibility of identifying a risk group of adolescents was 45.9% and the possibility of identifying a non-risk group was 73.3%. The hit ratio was 67.8%. In conclusion, the results of the study lead us to understand the type of adolescent attitudes toward sexual violence. The results will be useful to furnish a guideline for nursing intervention and education programs to prevent sexual violence in adolescence.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.2
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• pp.173-184
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• 2018

This study was conducted to construct and test structural equation modeling of the causal relationship of job satisfaction of nursing staff with satisfaction, revisit intention and recommendation of the hospital by patients. The data utilized in this study were the second data acquired from the 2012 Public Hospital Evaluation Programme. The subjects of this study were 2,375 nursing staff and 3,433 patients at 39 district public hospitals. The instrument of job satisfaction of nursing staff consisted of five factors and 13 items. The instruments of satisfaction, revisit intention, and recommendation to others of patients consisted of one question on an 11 point scale (0: very negative, 10: very positive). The data were analyzed using SPSS version 20.0 and AMOS version 20.0. Model fit indices for the hypothetical model were suitable for the recommended level: model of in-patient ${\chi}^2$ 904.598 (df=81, p<0.001), GFI 0.938, AGFI 0.900, RMSR 0.076, mode of out-patient ${\chi}^2$ 869.021(df=81, p<0.001), GFI 0.940, AGFI 0.900, RMSR 0.074. In conclusion, nursing staff are the largest group in public hospitals, and they provide direct care to patients. Therefore, job satisfaction of nursing staff should be enhanced to improve satisfaction of patients because their attitude significantly influences patient satisfaction.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.1
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• pp.346-354
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• 2018

In the probe of a medical ultrasound device, three parts were selected randomly by the examiner and the bacteria in the probe were detected by the blood examiners. In addition, the degree of death of the pathogenic bacteria after each disinfection of the detected pathogens, disinfecting ethanol, and disinfecting tissue of the detected pathogens were analyzed quantitatively. The following was detected: S Aureus (32.3 %), Bacillus spp. (26.5 %), Micrococcus spp. (21.5 %), and CNS (20 %). With the conventional probe, S. aureus (26.2 %), a playback curve (24.2 %), and a micron (19.5 %), Micrococcus spp. (15.5 %), and CNS (14.6 %) were observed. In the fan probe, S. aureus (24.7 %), Enterococcus (24.7 %), Enterococcus (17.7 %), and CNS (13.8 %) were detected. The disinfection of the three pathogens detected revealed sterilization of most of the pathogens, and most cases contained at least 91.3 % of the total sterilizing effect (P>0.05). In addition, for the disinfection of Propolis extract and disinfecting tissue, the disinfection effect was lower than that of disinfecting ethanol, but the difference was not statistically significant (P>0.05). The results revealed bacteria on most of the ultrasound probes. Antiseptic disinfection of surgical instruments using an extract of propolis works with results similar to those of ethanol. A blood test along with disinfection can help prevent infection if an ultrasound probe is applied to food.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.13 no.3
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• pp.1170-1177
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• 2012

The purpose of this study was to examine the relations between infant's mothers parenting stress, anger and anger expression patterns: The data for this study was collected from 205 among the 3 to 6 years old infant's mothers who attend to the three kindergartens and seven children's house. The instruments used for this study were a self-report questionnaire, PSI(Parenting Stress Index Short Form by Abidin), Anger and Anger-expression patterns. Regression analysis was the statistical method used for data analysis. Results: There were significant positive correlations in the infant's mothers parenting stress, state-trait anger and anger out/in. The results of multiple regression analysis indicated that infant's mothers parenting stress, state and trait anger were significant variables predicting mother's anger expression patterns. Conclusion: This study suggests that the parental education program are necessary which a infant's mother can express positively about anger and decrease parenting stress.

• The Journal of the Korea Contents Association
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• v.16 no.11
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• pp.499-509
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• 2016

This study was undertaken to investigate the factors that influence post-traumatic growth in patients with breast cancer. The study subjects were 100 outpatients with breast cancer who visited the outpatient clinic of a university hospital. The instruments used for this study were Korean Post-traumatic Inventory (K-PTGI), Modified Medical Outcomes Study Social Support Survey (mMOS-SS), Self-Efficacy Scale for Self-Management of Breast Cancer (SESSM-B) and Cancer Coping Questionnaire (CCQ). The data were analyzed by t-test, ANOVA, Pearson-correlation coefficient, and stepwise multiple regression using SPSS/WIN 21.0. The mean score of post-traumatic growth was $3.4{\pm}0.9$ out of 5. Post traumatic growth had statistically significant correlation with social support, breast cancer self-management self-efficacy, and coping behavior. In stepwise multiple regression analysis, post-traumatic growth was significantly influenced by therapeutic compliance related self-efficacy and positive reframing coping behavior and it was account for 29% of the total variance. These results suggest that these influencing factors should be considered in developing the nursing intervention to improve the post-traumatic growth in patient with breast cancer.

• Journal of the Microelectronics and Packaging Society
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• v.18 no.2
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• pp.49-55
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• 2011

The failure of electronic instruments is mostly caused by heat and shock. This shock causes the crack initiation at the solder joint interface of PCB component which is closely related with the formation of intermetallic compound(IMC). The Ag content in Pb-free Sn-xAg-0.5Cu solder alloy used in this study was 1.0, 1.2 and 3.0 wt.%, respectively. After soldering with PCB component, isothermal aging was performed to 1000 hrs. The growth of IMC layer was observed during isothermal aging. The drop impact property of solder joint was evaluated by impact bending test method. The solder joint made with the solder containing lower Ag content showed better impact bending property compared with that with higher Ag content. On the contrary to this result, the solder joint made with solder containing higher Ag content showed better impact bending property after aging. It should be caused by the formation of fine $Ag_3Sn$, which relieved the impact. It showed consequently the different effect of fine $Ag_3Sn$ and coarse $Cu_6Sn_5$ particles formed in the IMC layer on the impact bending property.