• Proceedings of the KOR-BRONCHOESO Conference
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• 1979.05a
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• pp.3.2-3
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• 1979

Bone conduction loss is one of the most common complication in chronic otitis media, and is mostly high frequency loss. Of 233 tympanomastoidectomy ears, 187 ears were considered eligible for this study. A histopathological change was examined in the natural otitis media of guinea pigs. It is our intention to analyze the pattern of bone conduction loss in chronic otitis media, and to correlate this findings with clinical and pathological changes in human and animal otitis media. l) In unilateral cases, a significant difference in bone conduction threshold was observed between normal and diseased ears, and between each frequency with significant interaction between 2KHz and 4KHz (p 0.01). 2) Using one way analysis of variance, mean bone conduction was compared with the duration of disease. We observed a significant difference (p 0.05) between each group of duration, except between 11-15 and 15-20 years group. 3) A comparison of bone conduction between stapes loss group and intact stapes group revealed significant t ratio (p 0.01) at each frequency. The effect of stapes loss on each frequency was evaluated, using one way analysis of variance. there were significant difference(p 0.05) between 250Hz and 500Hz. and between 2KHz and 4KHz. 4) A comparison of bone conduction between round window obliteration and nonobliteration group revealed significant t ratio (p 0.01) at each frequency. Using one way analysis of variance. the effect of round window obliteration was evaluated in each frequency. We observed significant difference (p 0.05) between 250Hz and 500Hz. and between 2KHz and 4KHz. 5) A comparison of bone conduction between cholesteatoma and non -cholesteatoma group revealed significant t ratio (p 0.01) only in 2KHz and 4KHz. No significant differency was observed in mean bone conduction. 6) In a histopathological study of natural otitis media in guinea pig, we observed inflammatory infiltration of the round window membrane, serofibrinous precipitate in the scala tympani, and degeneration of the organ of Corti most significant near the basal turn. These changes would explain high tone bone conduction loss in the process of chronic otitis media.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.10
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• pp.6611-6617
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• 2015

The purpose of this study is to compare the marginal and internal fit of metal and zirconia coping which is fabricated by manual and CAD/CAM(Computer Aided Design/Computer Aided Manufacturing). The model is prepared with Urethane material and two abutment teeth are fabricated with a knife and chamfer margin. Silicon replica technique is used to measure the marginal fit of manually fabricated and the CAD/CAM coping. Internal fitting level is measured with a microscope and the image is captured with a CCD camera. The distance between abutment teeth and coping is measured with a callibrated image analyzer software; marginal opening (MO), marginal gap (MG), internal gap (IG) at maximum curvature area, axial gap (AG), and occlusal gap (OG). Two-way ANOVA test is applied to compare fabrication technique and to analysis of abutment pattern. In addition, one-way ANOVA and Scheffe's test is used to analyze each parameter of the test. The result shows that the fit is < $120{\mu}m$ except OG of CAD/CAM and MO of knife margin. The CAD/CAM fabricated coping showed higher fit level at chamfer margin. However, knife margin showed better fitness compared to chamfer margin at MG. AG showed the minimum dimension with a constant result (< $38{\mu}m$).

• Journal of Korean Home Economics Education Association
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• v.28 no.2
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• pp.21-39
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• 2016

The purpose of this study was to investigate the differences in the school life satisfaction of middle school students according to self-directed learning capability and emotion regulation strategy. The subject of this study were 499 middle school students in Daegu. In order to analyze the data, two way ANOVA were employed for analysis and $Scheff{\acute{e}}$ test for post-hoc analysis. The main finding of this study were as follows; First, there were significant differences in the school life satisfaction of middle school students according to self-directed learning capability and behavioral emotion regulation strategy. Second, there were significant differences in the school life satisfaction of middle school students by cognitive emotion regulation strategy. But there were no significant differences in the school life satisfaction according to self-directed learning capability and cognitive emotion regulation strategy. Third, there were significant differences in the school life satisfaction of middle school students according to negative avoidant and emotion regulation strategy. However there were no significant differences in the school life satisfaction according to self-directed learning capability and negative avoidant emotion regulation strategy.

• Journal of the Korean Society for Railway
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• v.12 no.5
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• pp.761-771
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• 2009

This paper performed an empirical study through the survey to investigate the effects of the service orientation of the urban railway-operating company on employees' job satisfaction and customer orientation. For this, the surveyed data was analyzed through factor analysis, reliability analysis, and regression analysis. The difference between railway-operating companies was analyzed by the t-test and the differences between workers in different fields were analyzed by the ANOVA test. The results show that 1) human resource management, employee empowerment, service leadership, and service system are positively related to employees' job satisfaction in the decreasing order, 2) the service system, human resource management, and service leadership are positively related to customer orientation, but employee empowerment is negatively related to customer orientation, 3) the workers of the urban railway-operating company A and B show significant differences in job satisfaction and customer orientation, and 4) the job satisfaction and the customer orientation of the rolling stock maintenance workers was the highest and that of service workers in station was the lowest.

• Journal of the Korean BIBLIA Society for library and Information Science
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• v.29 no.4
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• pp.161-178
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• 2018

The purpose of this study is to explore how the Expert Power of archivists has influence on the job engagement and job satisfaction of record management personnel. The data were collected by survey with 103 record management personnel of office of education in Gwangju from September 2017 to October 2017. To analyze the research data, this study adopted several statistical analysis methods such as factor analysis, reliability analysis, correlation analysis, multiple regression analysis, independent sample T-test, and one-way analysis of variance. Results revealed that professionalism and influence tactics among professionalism, influence tactics, influence requirement be to the archivists Expert Power factors affect the job engagement and job satisfaction of record management personnel. Based on the results of the research, this study suggested the extension of educational training about record management and communication with record mangement personnel.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2005.06a
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• pp.694-697
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• 2005

The design of experiments are used for optimal design of formed tools to machine automobile bearing rubber seal die, which is classified into the high precision rubber mold. The clearance angle, rake angle and the length cutting edge are considered as the factors. The cutting force is selected to be a characteristic value and compared with the mean tool wear and life by repeated experiments. The design of the experiment is based on the repeated one-way factorial design, which finds the significance of the factors and the best level to predict the tool life by using ANOVA and regression.

• Journal of the Korean Society of Marine Environment & Safety
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• v.13 no.3
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• pp.191-198
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• 2007

Marine accidents are increasing as time goes on, in spite of lots of efforts are given. Marine accidents can be classified 3 categories those are ship's condition, navigator's condition and weather condition. In this paper, statistical analysis were carried using marine accidents data from 1997 to 2006. In order to analyze accident rate by time zone, ship's speed and finding distant, SPSS variance analysis was carried out. Results are followed. There was significant difference between time zone 20${\sim}$04 hours and other time zones. The accident rate in daytime was bigger than that at night. In case of the speed at collision, the speed of 5${\sim}$10 knot has significant difference to other speed cases. In finding distant cases, the case of less than 1 mile has significant difference to other distant cases.

• Journal of the Korean Society for Library and Information Science
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• v.51 no.2
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• pp.157-178
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• 2017

The objective of this study is to investigate college student search behavior in an academic library. The theory of planned behavior was applied for identifying relationship among variables on search behavior. Data were collected in an university. For data analysis, ANOVA, factor analysis, regression analysis, cluster analysis were used. The result shows: the theory of planned behavior can be used for finding search intention in an academic library. Student major and library use frequency are different statistically in attitudes, perceived behavioral control, behavioral intention. Student characteristics are divided into four types: conservative, independent, friendship, fashion. Friendship type of students influences search behavior. From cluster analysis, the cluster included friendship and independent types of students and students who have high frequency of library use has more active intention for search in academic library.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.1
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• pp.155-164
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• 2015

The aim of this study was to identify a variables that can affect Commitment to a Career Choice focusing mainly on the satisfaction with one's major in college and personal agency beliefs. This research carried out a survey on a total of 626 students at 4-year public and private university. The information is processed using the SPSSWIN19.0 program, which carried out frequency analysis, reliability measurement, one-way ANOVA, linear regression analysis, multiple moderating regression analysis, and three-step mediate regression analysis. The results of this study showed that groups showing greater satisfaction with their major had a higher level of commitment to a career choice. Personal beliefs was one thing that can achieve partial mediation or complete mediation when it comes to the relationship between the satisfaction of their major and commitment to a career choice.

• The Journal of Sustainable Design and Educational Environment Research
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• v.16 no.3
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• pp.18-26
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• 2017

In order to realize the empathy of the local education community, the education local government should establish the brand design properly in accordance with the enterprise and the large-scale administrative agency and actively use it in the public design strategy and publicity strategy. And the identity and role of education local government that are differentiated from each other can be well communicated and help to achieve the vision. However, the development and utilization of brand design in the provincial education local government is sluggish. In this context, research on urban brand has been carried out variously, but there is no comprehensive analysis on change of education local government brand. The purpose of this research is to analyze the current characteristics of brand design in education local government in order to enhance the image of education direction and to enhance the brand value of education local government.