• Textile Coloration and Finishing
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• v.26 no.3
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• pp.218-229
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• 2014

The wearing comfort of garment is governed by two kinds of characteristics such as moisture and thermal transport properties and mechanical properties of fabrics. The porosity influenced by yarn and fabric structural parameters is known as main factor for wearing comfort of garment related to the moisture and thermal transport properties. This study investigated effect of porosity of composite yarns to the moisture and thermal comfort properties of composite fabrics made of hollow composite DTY and ATY yarns. The theoretical porosity and pore size were inversely proportional to cover factor of fabric, but cover factor was not correlated with experimental pore size. The wicking property of hydrophobic PET filament fabric showed inferior result irrespective of porosity, pore size and cover factor. The drying rate was superior at composite fabrics with high pore size and low cover factor, and pore size was dominant factor for drying property. On the other hand, thermal conductivity of composite fabric was mainly influenced by cover factor and not influenced by porosity. Air permeability was influenced by both porosity and cover factor and was highly increased with increasing porosity and decreasing fabric cover factor.

• Journal of KIISE:Software and Applications
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• v.32 no.11
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• pp.1071-1083
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• 2005

By estimating probability distributions of the good solutions in the current population, some researchers try to find the optimal solution more efficiently. Particularly, finite mixtures of distributions have a very useful role in dealing with complex problems. However, it is difficult to choose the number of components in the mixture models and merge superior partial solutions represented by each component. In this paper, we propose a new continuous evolutionary optimization algorithm with distribution estimation by variational Bayesian mixtures of factor analyzers. This technique can estimate the number of mixtures automatically and combine good sub-solutions by sampling new individuals with the latent variables. In a comparison with two probabilistic model-based evolutionary algorithms, the proposed scheme achieves superior performance on the traditional benchmark function optimization. We also successfully estimate the parameters of S-system for the dynamic modeling of biochemical networks.

• Proceedings of the Korean Society of Machine Tool Engineers Conference
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• 2000.10a
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• pp.434-439
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• 2000

In this paper, in order to study the geometric factor effect of a circular hole near a crack tip in a semi-infinite plate, the Dimensionless Stress Intensity Factor, $F(=\frac K {\sigma {\sqrt{\pi a}}})$ is analyzed at the crack tip using a two Dimensional Boundary Element Method (BEM) program which is known as superior in Fracture Mechanics. Kelvin's solution was used as a fundamental solution in BEM analysis and displacement extrapolation method was used to determine Stress Intensity Factor.

• Journal of the Korean Data and Information Science Society
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• v.19 no.4
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• pp.1059-1071
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• 2008

In a balanced factorial design with a nested factor where crossed factors as well as a nested factor exist simultaneously, powers of the rank transformed FR statistic for testing the main, nested and interaction effects are superior to those of the parametric F statistic. In heavy tailed distributions such as exponential and double exponential distributions, powers of the FR statistic show much higher level than those of the F statistic. Further powers of the F and FR statistic for testing the main effect show the highest level in an absolute size as compared with powers of the F and FR statistic for testing the nested and interaction effects. However powers of the FR statistic for testing the nested and interaction effects rather than the main effect are greater in a relative size than powers of F statistic for the all population distributions.

• Proceedings of the KIEE Conference
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• 1987.07a
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• pp.754-756
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• 1987

In this paper, a new Harmonic Torque Factor(HTF) that represents torque ripple of induction motor is proposed. Trapezoidal PWM is analyzed to torque ripple by HTF and than we obtain optimum triangular factor at some carrier ratio. Six-step, sinusoidal PWM and Trapezoidal PWM are compared and evaluated for choosing a good control strategy of PWM inverter. It turns out that six-step inverter is better than sinusoidal PWM and Trapezoidal PWM when their carrier ratio is 9, and Trapezoidal PWM is superior to sinusoidal PWM. At induction motor is driven by PWM inverter, torque ripples are investigated by computer simulation using d-q two axis model. It is proved that a new Harmonic Torque Factor ix valid.

• Journal of Korea Game Society
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• v.12 no.6
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• pp.71-82
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• 2012

In the middle of global circumstance, having superior workmanship becomes very important factor to be competitive company. Especially, manufacturing development transferred to industry of knowledge service in these days, having superior workmanship is very important factor to determine company's success or failure. Because of this reason, company invests lots of money in recruiting and manages employees in the aspect of total period, such as workmanship training, management and assessment. This study research about development of 'Recruiting Serious Games' and suggests game that makes company conduct recruiting mission for some period and gives practical interview and chance of work through quantitative and qualitative assessment.

• Steel and Composite Structures
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• v.22 no.5
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• pp.1115-1140
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• 2016

This paper proposes an extension of the Improved Forced Based Design procedure to 3D steel structures. The Improved Forced Based Design (IFBD) procedure consists of a more rational sequence of the design checks proposed in Eurocode 8 and involves a more realistic selection of the behaviour factor instead of selecting an empirical value based on the ductility class and lateral resisting system adopted. The design procedure was tested on a group of four 3D steel structures, composed by moment-resisting frames with three storeys height and the same plan configuration in all storeys. The plan configuration was defined in order to target lateral restrained or unrestrained systems as well as plan regular or irregular structures. The same group of structures was also designed according to the force-based process prescribed in Eurocode 8. The member sizes obtained through the two approaches were compared and the seismic performance was assessed through nonlinear static and time-history analyses. The limit states referred to structural and non-structural damage, considering the two levels design approach, which are the serviceability and the ultimate limit states, were examined. The results obtained reveal that the IFBD leads to more economical structures that still comply with the performance requirements prescribed in Eurocode 8.

• Journal of Digital Convergence
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• v.16 no.5
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• pp.105-113
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• 2018

The purpose of this study was to find out the effects of the hotel using experience on customers' purchase and behavior intention. For this study, a total of 306 questionnaires among collected data for customers who hotel using experience at five star hotels located in Seoul from April 1, 2015 to April 30, 2015 was to ensure a valid sample. As a result of the experiments which conducted by factor analysis and regression analysis, it shows 1% level positive significant effects in purchase and continual purchase intention of "emotional experiencer", "physical experience factor", "continuous experience factor", and "superior experience factor", but it is 10% level significant effects in continual purchase intention positively effected continual purchase intention of "physical experience factor". Also, it shows 1% level positive significant effects on hotel customers' intention of reused, intention of suggestion, intention of recommendation of "emotional experiencer", "physical experience factor", "continuous experience factor", and "superior experience factor". From the study, it is expected to build hotel-customer relationship and brand level of awareness for activating customers' loyalty.

• Transactions on Electrical and Electronic Materials
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• v.17 no.3
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• pp.134-138
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• 2016

The fullerene solar cells are becoming a feasible choice due to the advanced developments in donor materials and improved fabrication techniques of devices. Recently, sufficient optimization and improvements in the processing techniques like incorporation of solvent vapor annealing (SVA) with additives in solvents has become a major cause of prominent improvements in the performance of organic solar cell-based devices . On the other hand, the challenge of reduced open circuit voltage (V_oc) remains. This study presents an approach for significant performance improvement of overall device based on organic small molecular solar cells (SMSCs) by following a two step technique that comprises thermal annealing (TA) and SVA (abbreviated as SVA+TA). In case of exclusive use of SVA, reduction in V_oc can be eliminated in an effective way. The characteristics of charge carriers can be determined by the measurement of transient photo-voltage (TPV) and transient photo-current (TPC) that determines the scope for improvement in the performance of device by two step annealing. The recovery of reduced V_oc is linked with the necessary change in the dynamics of charge that lead to increased overall performance of device. Moreover, SVA and TA complement each other; therefore, two step annealing technique is an appropriate way to simultaneously improve the parameters such as V_oc, fill factor (FF), short circuit current density (J_sc) and PCE of small molecular solar cells.

• Journal of Fisheries and Marine Sciences Education
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• v.22 no.3
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• pp.374-387
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• 2010

This study presumed that pre-service elementary teachers' stereotypical attitude toward foreign groups is critical factor to be considered in the context of Korean multicultural education. 422 pre-service elementary school teachers rated repeatedly seven ethnic groups on thirteen semantic differential scales which consist of four factors; attractiveness-unattractiveness, superiority-inferiority, rationality-irrationality, and aggressiveness-compliance. A series of repeated measure MANOVAs were used to test variability in pre-service elementary school teachers' stereotypical attitude across foreign groups. They rated Japanese the most positive, but Chinese the most negative, and others more or less positive in overall attitude. Their ratings of each ethnic group also varied across four attitude factors. Japanese and Whites were classified into the most attractive and superior, and moderately rational and aggressive groups. In contrast, Chinese were rated as the most unattractive, inferior, irrational, and moderately aggressive one. Southeast Asians were rated as attractive, compliant, and inferior one. In contrast, Arabians were rated as unattractive, aggressive, and moderately superior one. Finally, North Koreans were rated moderately superior, the most aggressive and irrational one. All these findings were discussed in terms of multicultural education in Korea.