• Advances in aircraft and spacecraft science
• /
• v.2 no.1
• /
• pp.17-44
• /
• 2015

A modular multidisciplinary analysis and optimization framework has been built with the goal of performing conceptual design of an advanced efficient supersonic air vehicle. This paper addresses the specific challenge of designing this type of aircraft for a long range, supersonic cruise mission with a payload release. The framework includes all the disciplines expected for multidisciplinary supersonic aircraft design, although it also includes disciplines specifically required by an advanced aircraft that is tailless and has embedded engines. Several disciplines have been developed at multifidelity levels. The framework can be readily adapted to the conceptual design of other supersonic aircraft. Favorable results obtained from running the analysis framework for a B-58 supersonic bomber test case are presented as a validation of the methods employed.

• Journal of the Korean Society of Systems Engineering
• /
• v.7 no.2
• /
• pp.21-30
• /
• 2011

The contractor management for the effective defense project is essential factor in the modern defense acquisition project. The occurrence of Improper Businessman causes the reason in which defense acquisition project is unable to be reasonably fulfilled and setback to the deployment of defense weapon system. In this paper, we develop a prediction model for the effective defense project by using the Discriminant Analysis, the Logistic Regression & Artificial Neural Network and analyse the core variables that determine the Improper Businessman in many variables. It is expected that our model can be used to improve the project management capability of defense acquisition and contribute to the establishment of efficient procurement procedure through entry of the reliable domestic manufacturer.

• Proceedings of the KIEE Conference
• /
• 2006.10c
• /
• pp.244-246
• /
• 2006

In this study, we search some parameters well-related to floating-sinking pulse by statistical analysis, because these pulses are frequently used in clinic. Pulse signals were acquired by 3D pulse analyzer and 30 subjects consist of 15 people diagnosed as floating pulse and 15 people diagnosed as sinking pulse by oriental doctors who have over 5 years clinical experience. Then, we made a representative beat template for each subject and, through a peak detection algorithm, we calculated several pulse parameters. To find the parameters related to floating-sinking pulse, we performed statistical testing with 17 parameters through the independence sampling, t-test. As a result, there is the biggest difference between pressure, the maximum pulse pressure, diastolic area(Ad) and float-sink data. (p < .05).

• Journal of Fisheries and Marine Sciences Education
• /
• v.17 no.1
• /
• pp.26-34
• /
• 2005

The purpose of this study was to investigate the influence of physical activity on communication and adaptation to school life of elementary school students. Seventy-two students (male 37; female 35) from two classes participated in the experiment. One class served as an experimental group and the other as a control group. The program consists of 16 sessions. Participants completed the Communication Scale and School Adjustment Scale. The collected data were analyzed by using t-test and covariance analysis. The results of the analysis showed that there were statistically significant differences between elementary school students who participated in physical activity and ones who did not in terms of communication and school life adaptation. Based upon these results, it is concluded that physical activity is effective for communication and school life adaptation of elementary school students.

• Journal of Korean Society of Rural Planning
• /
• v.12 no.1 s.30
• /
• pp.49-58
• /
• 2006

Rearing community youth has been main factors of sustainable agriculture and rural community. The purposes of this study were to analyze the leadership skill and organizational commitment of community youth and to investigate the relationship between leadership skill and organizational commitment. The data were collected from 196 rural youth by stratified random sampling. The study was adopted t-test, ANOVA factor analysis and correlation analysis. The major findings of this study were as follows; First, community youth married, wealthier, and expanded farming area were more likely to have leadership life skills than others. Second, community youth wealthier and expanded farming area were more likely to have organizational commitment than others. Third, group activity, being leader, teaming skill, communication self understanding, decision making, language skill among leadership skills have positively correlated with organizational commitment.

• The Journal of Korean Society for School & Community Health Education
• /
• v.21 no.2
• /
• pp.1-14
• /
• 2020

Objectives: The purpose of this study was to identify factors(perceived health and social support) affecting social capital formation of the elderly. Methods: Samples consisted of 184 people aged over 65 years old in one county of Kyungsangbukdo. Data were analyzed with t-test, ANOVA and regression analysis. Results: First, social support(both emotional support and instrumental support) were significantly different by economic status. Secondly, regression analysis showed that perceived health affected a positive influence on social capital in Model1, which analyzed only perceived health. However, Model2, which analyzed perceived health and social support(emotional support, instrumental support) at the same time, showed that only instrumental support affected social capital formation. Conclusions: It was suggested to develop customized health promotion and job creation are required for social capital formation of the elderly.

• The Research Journal of the Costume Culture
• /
• v.9 no.3
• /
• pp.343-356
• /
• 2001

The purpose of this was to classify consumer groups according to the life styles and analyze buying intention and evaluation criteria of apparel product, opinion to 4p\`s aspect among consumer groups. And it was to clarify relationships between the experience of CATV home shopping and buying intention and evaluation criteria of apparel product, opinion to 4p\`s aspect. The subjects of this study were 270 women living in Chonbuk and Chonnam regardless their experience in CATV home shopping. For data analysis, frequency, percentage, mean, t-test, factor analysis were conducted. The results were as follows; First, the type of life style were classified into the following subdivisions: products confirmed type, price-quality regarded type, time regarded type, new product regarded type. Second, the significant differences among the classified life style groups were found in buying intention, evaluation criteria of apparel product, and opinion to 4p\`s aspect. Third, there were significant differences in buying intention, evaluation criteria of apparel product, and opinion to 4p\`s aspect according to TV home shopping experience.

• The Research Journal of the Costume Culture
• /
• v.5 no.1
• /
• pp.137-150
• /
• 1997

This study examined the effects of demographic characteristics (education, income level) on the relationships among knowledge of textile fibers, information searching behavior on textile fabrics, and information sources of textile materials in children's clothings. The subjects were 307 mothers with preschool children(4∼6years) in Seoul. Data were collected using a self-administered questionnaire and analyzed using T-test analysis of variance, corelations, and crosstabulation analysis. The results indicated that : (1) Educational levels of consumers had significant influences on knowledge of textile fibers, information searching behavior on textile fabric, and information sources of textile materials in children's clothings. (2) There were significant relationship between consumer's knowledge of textile fibers and information searching behavior on textile materials in children's clothings.

• Structural Engineering and Mechanics
• /
• v.5 no.5
• /
• pp.625-634
• /
• 1997

Reinforced concrete (RC) interior beam-column joints with high-strength materials: concrete compressive strength of 100 MPa and the yield strength of longitudinal bars of 685 MPa, were analyzed using three-dimensional (3-D) nonlinear finite element method (FEM). Specimen OKJ3 of joint shear failure type was a plane interior joint, and Specimen 12 of beam flexural failure type was a 3-D interior joint with transverse beams. Though the analytical initial stiffness was higher than experimental one, the analytical results gave a good agreement with the test results on the maximum story shear forces, the failure mode.

• Journal of Families and Better Life
• /
• v.33 no.1
• /
• pp.75-85
• /
• 2015

This study aimed to examine the effects of science activities connected to physical expression on the four-year-old children's creativity. This study conducted an observation of sixty-four children of four years of age attending the kindergartens in the city of Seoul. Thirty-seven were classified in the experimental group and the remaining twenty-seven were in the comparative group. For the statistical analysis of the data collected, the t-test and the analysis of covariance(ANCOVA) were conducted. The findings of this research are as follows. The children of the experimental group who experienced science activities connected to physical expression demonstrated higher score than those of the comparative group in creativity. The result of the research indicates that science activities connected to physical expression, for children, enhances their creativity. Therefore, science activities connected to physical expression can be an effective approach for creativity of young children.