• Journal of Technologic Dentistry
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• v.16 no.1
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• pp.105-113
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• 1994

This study attempted to find out how much stress Dental Technicians of working in Dental Laboratory have built up in the midst of their daily lives are according to their sex, age, duration of work and their kinds of positions. After self-administered questionnaire were distributed by direct to 230 technicians samplely selected from dental laboratories in Seoul and Pusan of whom 163 technicians responded from october 1 through october 13, 1994. Analysis of the data was processed by t-test, $X^2$-test, ANOVA. This results are as follows. 1. Levels of Stress of the total 163 respondents by sex is not higher among male than female(p>.05). 2. Levels of stress - 36.2%(74 Dental technicians) of all Dental technicians were in stress on the whole and 9.2%(15 Dental technicians) of them were in a serious situation by accumulated stress. 3. Realization of stress - 10.1%(16 Dental technicians) of the dental technicians and 89.9%(143 Dental technicians) were found out to be in a dangerous sign or in a situation by accumulated stress. Further studies which a big size and a delicate method of measuring their general characteristics are needed.

• Journal of the Korean Home Economics Association
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• v.30 no.4
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• pp.167-182
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• 1992

The purpose of the study was to determine if an abstract color palette was representative of a color scheme of interior environment by which the meaning of colcor could be determined. An abstract color palette was developed by the researchers to show contrast, overlapping, and adjacencies as they might actually appear in an interior environment. Six pictures and six color palettes were used to test the meaning of color. The questionnaire consisted of 21 words to describe the color of interior environment. The sample consisted of 73 undergraduate students of varied majors. A factor analysis was used to identify the structure of color meaning. Five factors; emotional factor, factor of unity, spatial quality factor, factor of complexity, and social evaluation factor were identified. A t-test was used to analyze the difference in responses to the descriptor words for the pictures and palettes. It was found that in 14 of 21 descriptor, there was no significant difference between evaluation of color meaning for the pictures and palettes in 50% or more of the cases.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2000.05a
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• pp.78-81
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• 2000

Metal oxide surge arrester were developed in the late 1970s, and were immediately adopted as significant breakthrough in over voltage protection of power system. Work was continued throughout the world on the design, development and application of metal oxide surge arrester. This paper describes the evaluating test and results of practical use for analyzing the performance of gapless metal oxide surge arresters under various type test. In the result, ZnO element exhibited badness rate of 6.95 percent.

• Journal of the Korean Society of Clothing and Textiles
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• v.21 no.4
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• pp.782-794
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• 1997

The purpose of study were 1) to find whether brand loyalty is reasonable measurement for market segmentation or not, 2) to know consumers' purchasing behavior by marketsegmentation, 3) to draw preference jean product. Objects were 462 high school students who live in Seoul and random sampling referred from "Korean school guide book". The questionnaires were selected from the previous studies and various bibliographies. For statistic analysis, percentage, average, ANOVA, x2-test, Duncantest, paired t-test, and multiple regression were used by SAS package. The results of this study were as follows. 1) Consumers were classified into affective brand loyalty group, familiar brand loyalty group, habitual brand loyalty group, brand interest but no brand loyalty group, and no brand loyalty group. 2) There were notable differences in clothes purchasing behavior variable through market segments' purchasing (requency, price. 3) The most Prefered jean Product is 80,000 won, domestic well-known brand, baggy style and preferable jean product shows different when it classified brand loyalty.d loyalty.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2009.05a
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• pp.259-262
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• 2009

IEC 61850 based substation automation system mainly consists of human machine interface and a various of IEDs in charge of protective and control functions of the substation. Both of them should require the performance verification of IEC 61850 communication services because their communication relation is the same as client and server throughout the digital network. This paper shows a research result on the testing method of basic communication interface of the IEC 61850 based client, which was implemented by the analysis of real communication between HMI and IED of IEC 61850 based substation automation system and refereed to IED IEC 61850 conformance test procedures.

• Journal of the Korean Society for Precision Engineering
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• v.11 no.3
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• pp.105-121
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• 1994

In this paper, we proposed the two-parameter model for predicting the residual strength in CFRP laminated composites subjected to high velocity impact and developed and formulated it based upon Cparino's by using the ratio of impact and the normalized residual strength. Critical indentation was obtained by the statical indentation tests. Impact tests were carried out through air-gun type impact equipment with the velocities varied 30-100m/sec. Projectiles were steel balls with 5 and 7mm in diameter. Test material was carbon/epoxy. The specimens were composed of [ .+-. 45 .deg. /0 .deg. /90 .deg. ]$\_$2/ and [ .+-. 45 .deg. ]$\_$4/stacking sequences and had 0.75$\^$T/*0.26$\^$W/*100$\^$L/(mm) dimension. Results from the proposed model were in good agreement with the test data. And failure mechanism due to high velocity impact is given here to examine the initation and deveolpment of damage by fractography and ultrasonic image system. The effects of the 0 .deg. -direction ply position and the amount to damage area on the residual strength are considered here.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2000.11a
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• pp.568-574
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• 2000

This paper presents the vibration characteristics of a continuous circular cylindrical shell multi-simply supported at arbitrary axial positions for searching design parameters. In this modal test the impulse test method is applied to the excitation of experimental model. Natural frequencies are obtained from the peak points of frequency response function(FRF) through frequency analyzer and vibration behaviors are investigated. FE analysis is performed with ANSYS 5.5 to improve the reliability of experimental results. Their results are compared with experimental results. The effect of dynamic characteristics is analyzed for the number of support point on the shell.

• The Korean Journal of Health Service Management
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• v.14 no.2
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• pp.67-77
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• 2020

Objectives: The Purpose of this study is to investigate the effect of self-leadership on the organizational effectiveness of a dental hygienist who has completed a bachelor's degree of dental hygiene science. Methods: A self-reported questionnaire was completed by 303 dental hygienists in the Jeonbuk area from July 1 to August 31, 2019. Data were analyzed through the chi-square test, t-test, one-way ANOVA, and multiple regression analysis using the SPSS 18.0 program. Results: Subject's age, marital status, and clinical experience had significant effects on self-leadership and organizational effectiveness. It was found that the course completion status of bachelor's degree was related to self-leadership and organizational effectiveness. Conclusions: Completing a bachelor's degree in dental hygiene science impacts self-goal setting and constructive thinking of self-leadership. This also influences job satisfaction and organizational commitment.

• Journal of Fashion Business
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• v.12 no.5
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• pp.141-154
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• 2008

The purpose of this study was to identify factor structure of consumption value, clothing attitudes and the effects of consumption value on clothing attitudes. Questionnaires were administered to 513 college students living in Deagu and Kyungbook province. Data were analyzed by using frequency, factor analysis, multiple regression, t-test, ANOVA, and Scheffe-test. The findings are as follows. Consumption values were composed of five factors such as social value, differentiated individuality, material value, functional value, and circumstances value. Clothing attitudes were composed of five factors such as pursuit of individuality, fashion interests, utility pursuit, appearance conspicuousness, and social approval. The effects of consumption value on each of clothing attitude variables, pursuit of individuality, fashion interests, appearance conspicuousness, and social approval were explained by the factors such as social value, differentiated individuality, and functional value, utility pursuit by social value, functional value, and circumstances value.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.20 no.5
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• pp.351-356
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• 2008

In this study, we had the stress analyses of TBP used in Tall Building and determined the working pressure of TBP. We knew the four fact. First, the place acted maximum stress is axial direction of branched part. Second, working pressure is more than 2.0 MPa. Third, stress in branched part is less than yielding strength at hydrostatic test pressure. Fourth, the ratio(stress/yielding stress at hydrostatic test pressure) is $0.4{\sim}0.6$(KS D 3562 Sch 40), $0.3{\sim}0.4$(KS D 3576 20S).