• 한국의류학회지
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• 제41권6호
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• pp.1109-1123
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• 2017

This study analyzed a somatotype of teenager's that was suitable to improve the reality of a virtual model size. We analyzed 843 teenagers 12-18 years old from the 6th Size Korea data. First, factor analysis was done for abstracting new criteria and dividing the somatotype; subsequently, we selected the waist height proportion to stature (body proportion) and drop (torso shape). Next, the cluster analysis was done with these criteria; subsequently, 5 body proportion types and 7 torso shapes were distinguished. A virtual model size for 4 somatotype with more than 50 persons was also designed by a regression analysis that constituted sizes for each factor. The designed model size was compared with body size as well as with Clo's virtual model size. The research model showed a high similarity in sizes with body as well as improved reality over the Clo model that presented size problems such as low waist height, bigger bust, and smaller thigh circumference than the real body.

• 대한가정학회지
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• 제49권7호
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• pp.67-80
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• 2011

This study investigated a path model in which men's and women's communication behavior escalating marital conflict (CBEMC) may be influenced directly and indirectly, via negative interpretations of their spouse, by their spouse's problem behavior, the couple's turning toward bids, and dyadic perspective-taking. Self-report data were collected from 498 married men and women who were living in Busan, Korea. Multiple-group analysis revealed that the path model was not equivalent for men and women. Their couple's turning toward bids and dyadic perspective-taking for men, and their spouse's problem behavior and dyadic perspective-taking for women, had direct effects on CBEMC. Further, their spouse's problem behavior and the couple's turning toward bids had indirect effects on CBEMC through negative interpretations in both men and women. The indirect effect of dyadic perspective-taking on CBEMC was significant only for men. Finally, considering total effects, dyadic perspective-taking was the strongest predictor of CBEMC for both genders.

• 대한환경공학회지
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• 제28권7호
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• pp.713-720
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• 2006

일본 관동지역을 대상으로 PCBs의 대기 중 거동을 해석하기 위해 단일 구획상자모델을 사용하였으며, 대기 중 기온과 PCBs의 각 동족체의 거동사이의 관계를 시뮬레이션하였다. 또한 모델을 이용하여 대상 지역에 있어서의 PCBs의 년간 배출량과 침적량을 추산하였으며, 년간 배출량은 3,320 kg, 년간 침적량은 1,480 kg으로 예측되었다. 대기 중 PCBs의 제거기작(이류, 건성-습성 침적 및 반응) 중 이류의 기여는 전체의 약 $20{\sim}38%$로 나타났으며, OH라디칼 반응에 의한 감소는 무시할 정도로 작았다. 본 연구에서 사용한 단일 구획상자모델이 대기 중 PCBs의 거동을 이해하는데 활용될 수 있을 것으로 생각된다.

• Advances in Energy Research
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• 제8권1호
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• pp.21-39
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• 2022

In this study, the first law of thermodynamics was used to establish a one-dimensional (1-D) thermal model for parabolic trough receiver (PTR) taking into account the pressure drop and kinetic energy loss effects of the heat transfer fluid (HTF) flowing inside the absorber tube. The validation of the thermal model with data from the SEGS-LS2 solar collector-test showed a good agreement, which is consistent with the previously established models for the conventional straight and smooth (CSS) receiver where the effects of pressure drop and kinetic energy loss were neglected. Based on the developed model and code, a comparative study of the newly designed parabolic trough S-curved receiver versus the CSS receiver was conducted and solar unit's performances were analyzed. Without any supplementary devices, the S-curved receiver enhances the performance of the parabolic trough module, with a maximum of 0.16% compared to CSS receiver with the same sizes and mass flow rates. Thermal losses were reduced by 7% due to the decrease in the temperature of the outer surface of the receiver tube. In addition, it has been shown that from a mass flow rate of 9.5 kg/s the heat losses of the S-curved receiver remain unchanged despite the improvement in the heat transfer rate.

• KSBB Journal
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• 제4권1호
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• pp.15-16
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• 1989

Dextran gel 섬유인 Sephadex G gels의 크기를 Ogston-Laurent 의 gel model에 의하여 측정한 결과 섬유의 길이는 $12.48{\times}10^{12}(G-200)$ cm/ ml 범위이고, 섬유의 지름과 partial specific volume은 각각 $7.21{\tiems}10^{-8}cm$와 0.586ml/g이었다.

• Advances in environmental research
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• 제7권1호
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• pp.29-37
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• 2018

A simple mathematical model for predicting fixed bed adsorption dynamics is described. The model is characterized by a linear adsorption isotherm and a linear driving force expression for mass transfer. Its analytic solution can be approximated with an algebraic equation in closed form which is easily evaluated by spreadsheet computation. To demonstrate one application of the fixed bed model, a previously published adsorption system is used as a case study in this work. The adsorption system examined here describes chromium breakthrough in a fixed bed adsorber packed with imidazole functionalized adsorbent particles and is characterized by a nonlinear adsorption isotherm. However, the equilibrium behavior of the fixed bed adsorber is in essence governed by a linear adsorption isotherm due to the use of a low influent chromium concentration. It is shown that chromium breakthrough is predicted reasonably well by the fixed bed model. The model's parameters can be easily extracted from independent batch experiments. The proposed modeling approach is very simple and rapid, and only Excel is used for computation.

• Journal of Magnetics
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• 제5권2호
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• pp.27-34
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• 2000

The structure of a series of Cu/Ni is characterized by using a program, SUPREX, to model the x-ray diffraction patterns, multilayers. The samples had nominal layer thickness of 3/3, 7/7, 13.5/13.5, 20/20, 30/30, 50/50, 80/80, 100/100, and 200/200 Angstroms. The diffraction patterns were taken around the (111) peak for the two constituent materials. A kinematical model is used to characterize the diffraction patterns and the parameters for the model are described. An initial model is calculated using initial guesses for the parameters. The model is then fit to the data by reducing $x^2$using the Levenberg-Marquardt algorithm. The samples are shown to be high quality supperlattices.

• 대한임베디드공학회논문지
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• 제7권5호
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• pp.267-275
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• 2012

In this paper, we present the model-based autonomic computing framework for a cyber-physical system which provides a self-management and a self-adaptation characteristics. A development process using this framework consists of two phases: a design phase in which a developer models faults, normal status constrains, and goals of the CPS, and an operational phase in which an autonomic computing engine operates monitor-analysis-plan-execute(MAPE) cycle for managed resources of the CPS. We design a hierachical architecture for autonomic computing engines and adopt the Model Reference Adaptive Control(MRAC) as a basic feedback loop model to separate goals and resource management. According to the GroundVehicle example, we demonstrate the effectiveness of the framework.

• 소성∙가공
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• 제21권7호
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• pp.441-446
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• 2012

A sequential coupled field analysis of electromagnetic free bulging was performed by using FEM. A 2D axi-symmetric electromagnetic model based on the magnetic vector potential is proposed for the calculation of magnetic field and Lorentz's forces. The Newmark integration method is used to calculate the transient dynamic plastic deformation of sheet during free bulging. In the finite element model, the effect of sheet deformation on the electromagnetic field analysis is taken into consideration. In order to confirm the sequential electromagnetic-mechanical coupling analysis, an experiment with an electromagnetic forming apparatus was conducted. The results showed that the final bulge height of the sheet predicted from the proposed method is in good agreement with experimentally measured height.

• 소성∙가공
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• 제17권7호
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• pp.517-522
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• 2008

A visco-plastic self-consistent (VPSC) polycrystal model has been applied to simulate texture simulation and anisotropic properties of DP steels during deep drawing process. In order to evaluate the strain path during deep drawing, a steady state was assumed in the flange part of deep drawn cup. The final stable orientations were strongly dependent on the initial location in the blank. The evolution of anisotropy of DP steel sheets has been demonstrated through comparison of plastic strain rate vector at the different plastic strain levels.