• Journal of the Korean Solar Energy Society
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• v.27 no.3
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• pp.117-125
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• 2007

This study proposes a CFD(Computational Fluid Dynamics) analysis as a method of verification of the designed-data and a supplement of the insufficient experiences in geothermal system, which shows a rapid growth among the renewable energies. The followings are the results. FLUENT 6.2.12 is used as a CFD tool on this study, with the equations of continuity, motion, energy for unsteady flow through pipes and k-epsilon turbulent model. S-type model which has one borehole with diameter 12m by depth 206m and T-type model which has 3 boreholes with $12m{\times}20m{\times}206m$ are proposed, and also the boundary conditions are described. The temperature differences between temperatures by CFD analysis and by on-site measurement are less than 1.5%, this shows a high reliability of CFD analysis process which this study proposes. After 11 days simulation operated 12 hours interval On/Off mode, it is clearly predicted that the outlet temperatures of geothermal pipes are increased by $1.2^{\circ}C$, and $2.2^{\circ}C$ after 4 months. And the outlet temperatures of geothermal pipes increased with increase of the mass flow rates through the pipes. T-type model shows that the 4m distance between boreholes are reasonable because the temperatures at 2m and 6m from boreholes are nearly same.

• Fashion & Textile Research Journal
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• v.19 no.6
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• pp.723-735
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• 2017

The explosive growth rates in sales of climbing clothes-centered outdoor wear has slowed; however, athleisure wear worn while enjoying sports activities is still popular. This research study investigated differences between pursuing benefits of athleisure clothing and purchase intentions of athleisure clothing according to lifestyles, targeting male and female consumers aged 20s-50s. Analytic research data was statistically processed with the use of SPSS 18.0. The factor analysis and reliability analysis, multiple-regression analysis and t-test analysis and descriptive statistics were conducted. The study analyzed the results of pursuing benefits of athleisure clothing according to lifestyle. The study results showed that fashion oriented, health oriented, and sociability oriented factors had significant effects on youth and fashion; however, rational consumption, leisure orientation, sociability orientation, and value oriented factors showed significant effects on everyday clothing functionality. Health orientation and leisure orientation factors also exerted significant effects on comfort; in addition, the factors of fashion oriented, value oriented, rational consumption, and health orientation also had significant effects on ideal body image. This study investigated purchase intentions for athleisure clothing according to lifestyles. The study results revealed that fashion oriented, leisure oriented, private life centered, and health oriented factors also showed significant effects on purchase intentions for athleisure clothing.

• Korean Journal of Construction Engineering and Management
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• v.17 no.2
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• pp.118-126
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• 2016

International construction market have quantitatively increased and have reached up to 700 Bil. US$ through active effort of construction firms and government. In spite of this increase, substantiality issue has been constantly disputed due to qualitative problems such as lack of capability and technical shortage. To overcome these problems, many methods in performing quantitative growth and qualitative substantiality of overseas construction are being researched which showed that selection of subcontractors in general contractor is regarded as a very important success factor. However, it is difficult to make a reasonable decision for selecting the subcontractors due to the lack of evaluation standards and reliability. This study proposes an improved evaluation system through adjustment of the evaluation indicators using correlations analysis and multiple regression analysis with pre-qualification and performance evaluation of 121 firms in 6 countries.

• Journal of Korean Society of Transportation
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• v.25 no.6
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• pp.89-97
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• 2007

The car-dependent traffic system based on highly advanced industrialization and economic growth causes various urban problems including traffic jams, energy consumption, air pollution, noise, car accidents and other issues. Particularly in urban areas, air pollution from motor vehicles is worse than pollution from past industrialization. In this study, therefore, the authors grasped car exhaust reduction effects by using microsimulation and those traffic policies that could make cars flow smoothly, reducing the air pollution in urban areas through analysis on profitability. As a result, the weekday-based car using system has been found most effective as it does not need investment cost. However, this system may be socially unacceptable, as it requires the government to change driver behavior. Therefore, the government needs to first reach a consensus with the citizens regarding this system. This system will also be effective with other alternatives. As a follow-up study, the authors will research citizens' perceived impacts of car exhaust on air pollution through a study on preference and grasp the possibility of applying these study results to real traffic policies.

• Journal of Convergence for Information Technology
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• v.10 no.6
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• pp.35-40
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• 2020

As we enter the society of the future, efforts to increase healthy living are a major area of concern for modern people. In particular, the development of technology for a healthy life that combines ICT technology with a competitive healthcare industry environment is becoming the next growth engine. Therefore, in this paper, artificial intelligence-based data analysis of the examination results was applied in the health examination process. Through this, a research was conducted to build a knowledge base modeling that can improve the reliability of the overall judgment. To this end, an algorithm was designed through deep learning analysis to calculate and verify the test result index. Then, the modeling that provides comprehensive examination information through judgment knowledge was studied. Through the application of the proposed modeling, it is possible to analyze and utilize big data on national health, so it can be expected to reduce medical expenses and increase health.

• Korean journal of food and cookery science
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• v.32 no.6
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• pp.762-772
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• 2016

Purpose: Adolescence is a critical period for growth and development; hence, knowledge about good food habits is essential amongst children. This study was conducted to investigate prevalence of awareness among food sellers, which could probably influence children's health and perceptions on food around schools towards adulterated food management beliefs, competencies, and food safety practices. Methods: Data was collected from 195 dealers around 25 elementary, middle and high schools in Daegu and Gyeongbuk provinces using a self-administered questionnaire in July and August, 2015. The data was analyzed using frequency analysis, one-way analysis of variance, $x^2$-test, factor analysis, and reliability analysis by SPSS Statistics (ver. 23.0). Results: A total of 121 people (62.1%) reported satisfaction of providing information and education on adulterated food. The perception of hazardous substances was found to be related to food poisoning bacteria and viruses (65.6%), heavy metals (42.1%), environmental hormones (36.4%), residual pesticides (27.2%), and irradiated food (26.7%). The perceived score on hygiene practices for processed food seller was $4.04{\pm}0.56/5.00$ and for cooked food seller was $4.09{\pm}0.45$. The capacity of adulterated food management practice of food sellers was significantly correlated with food knowledge on adulteration and public relation capacity, necessity of adulterated food management, and perception of hygiene practices (p<0.01). Similarly, knowledge and public relation capacity were significantly different according to ages (p<0.01). The perception of the necessity of adulterated food management was significantly different according to education levels (p<0.05), and the evaluation of hygiene practices was significantly different according to age (p<0.01). Conclusion: In order to solve the problem of adulterated food, which is one of the four social evils, and to strengthen the capacity of children to solve social problems, various practices like campaign on health promotion, goof food habits, education, and adulterated food management, should be actively promoted not only for children but also for food sellers around the schools.

• Journal of Fashion Business
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• v.17 no.5
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• pp.84-100
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• 2013

The purpose of this study is to classify men's fashion leadership into groups and analyzed the differences for the actual conditions of cosmetics purchasing and evaluation criteria. Questionnaires are being administered from 163 men in their 20's and 30's living in Deagu Metropolitan City and Kyungbook. Frequency, factor analysis, reliability analysis, cluster analysis, ANOVA, Duncan-test, and $X^2$-test are all used for data analysis. Our findings are as follows. Men's fashion leadership is being categorized into fashion opinion leadership, innovative communicator and fashion innovator. Cosmetics evaluation criteria are service/aesthetic, ostentatious, function, and economy. Men's fashion leadership is classified into three groups: fashion laggards, fashion leaders, and fashion followers. Males show no significant differences in the function of cosmetics evaluation criteria by the groups but they show significances in service/aesthetic, ostentatious, and economy. Groups display distinctions between the sub-variables in the actual condition of cosmetics purchasing such the place of purchase, companionship when buying cosmetics, and average monthly purchase amount. Although the cosmetic markets for men show high average growth rates per year, cosmetic interests at the age of twenties and thirties are generally low, and cosmetics are not actively used. The customers' experience of using merchandise not only provide the opportunities of trying beforehand, but also lead to the role of information transfer, thus, it can be positively applied to active marketing. In addition, it can be expected that the low-priced cosmetic markets are guaranteed to obtain loyal customers through repurchasing and maintain long-term relationships by providing fashion followers with several promotional events.

• Journal of Industrial Convergence
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• v.21 no.3
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• pp.17-27
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• 2023

This paper investigated and studied the influence of consultant's competence on CEO's values. There are many studies about relation between consultant's competence and company's accomplishment, but there are lack of research about how consultant's competence effected CEO's Value. The data source used in this study is a questionnaire survey involving 177 CEOs of SME who have experience in consulting. Based on this collected data, we conducted factor analysis, reliability and validity analysis, and hypotheses were verified through correlation analysis and regression analysis. This study shows that consultant's competence affected CEO's values in some ways, and also contributes to both academic and practical implications about corporate management that related sustainable growth between consultant and client.

• Journal of the Korean Crystal Growth and Crystal Technology
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• v.26 no.4
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• pp.155-158
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• 2016

Thermal conductivity is a very important factor for applicability and reliability in electrical devices. In this study, Al/graphite composite is fabricated by a mechanical alloying and heat-treatment and its physical properties are characterized. The XRD peak intensity of the $Al_4C_3$ ceramic phase observed in the heat-treated Al/graphite composite increased with heat-treatment temperature and time. The thermal conductivity of the heat-treated Al/graphite composite sample was very lower than that of the pure Al sample, and increased with heat-treatment temperature and time.

• Transactions of the Korean Society of Mechanical Engineers
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• v.9 no.5
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• pp.539-547
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• 1985

The low-cycle fatigue crack growth behavior of SUS 304 Stainless steel was investigated at 650.deg. C by the nonlinear fracture mechanics. Crack Propagation can be separated in to cycle-dependent and time-dependent, the former is correlated with .DELTA. $J_{f}$ , J-intergral range and the latter is correlated with J', modified J integral. Transition from cycle-dependent to time-dependent crack growth was successfully predicted using the .betha. hypothesis, which was proposed by the authors on the basis of an analysis on the interaction of elastic and creep strain. To investigate the reliability of .betha.-hypothesis, experimenting by the change of stress-level, stress rate and frequency, following conclusions were obtained. (1) High temperature fatigue crack propagation was separated into cycle-dependent and time-dependent. (2) Transition of crack propagation was predicted by .DELTA. $J_{c}$/.DELTA.$_{f}$ or .betha. (3) Lower limit in cycle-dependent crack propagation was obtained..