• Proceedings of the Korean Information Science Society Conference
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• 2002.04b
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• pp.271-273
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• 2002

현재의 소프트웨어들은 자연의 시스템에서 관찰할 수 있는 다양성과 복잡성을 얻기에는 한계가 있다. 그러나 우리는 소프트웨어가 단순한 규칙, 단순할 구조만으로 구현되어도 결과의 복잡성과 다양성을 나타낼 수 있는 시스템을 필요로 한다 단 논문에서는 소프트웨어의 복잡도나 크기를 늘리지 않고 결과의 복잡성이나 다양성을 얻을 수 있는 방법으로서 상호작용에 기초한 E-O-M 모델을 제안한다. 기본 아이디어는 복잡성이나 다양성은 단일 객체로 구현하기에는 무리이며 많은 객체들간의 상호 작용에 의해 나타나는 창발적 특징이란 것이다.

• Journal of Haehwa Medicine
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• v.13 no.2
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• pp.123-129
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• 2004

We observed the efficacy of natural herbs and mixture in treating atopic dermatitis using anti-human IgE treated Human HMC-I cell model. We selected three herbs, Cynonchum witfordii, Diospyros kaki, Ilite which were used to treat skin disease in Traditional Korea Medicine. Using Human HMC-I cell treated with anti-human IgE, we investigate in vitro whether each herb effects on IL-4, IL-13, TNF-a expression and TNF-a, Histamine secretion value. The results show the possibility that the mixture of three herbs may be better in improving atopic dermatitis condition.

• Structural Engineering and Mechanics
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• v.38 no.3
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• pp.301-314
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• 2011

The paper constitutes the second part of the author's study. The first part (Podworna 2010) formulates four fundamental tasks in dynamics of the bridge-track-train systems. The following cyclic moving loads are considered: a concentrated forces stream (model P), an unsprung masses stream (model M), a single-mass viscoelastic oscillators stream (model $M_o$) and a double-mass viscoelastic oscillators stream (model $MM_o$). Three problems precluding to the numerical simulations have been developed, i.e., prediction of the forced resonances, the parameters of integration of equations of motion, the output results. A computer programme was written in Pascal and numerical research in the scope of the fundamental tasks was worked out. The investigations were focused on adequacy evaluation of the moving load models, P, M, $M_o$, $MM_o$, in predicting dynamic processes in railway bridges.

• Bulletin of the Korean Chemical Society
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• v.34 no.2
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• pp.519-523
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• 2013

When atomic layer deposition (ALD) is performed on a porous material by using an organometallic precursor, minimum exposure time of the precursor for complete coverage becomes much longer since the ALD is limited by Knudsen diffusion in the pores. In the previous report by Min et al. (Ref. 23), shrinking core model (SCM) was proposed to predict the minimum exposure time of diethylzinc for ZnO ALD on a porous cylindrical alumina monolith. According to the SCM, the minimum exposure time of the precursor is influenced by volumetric density of adsorption sites, effective diffusion coefficient, precursor concentration in gas phase and size of the porous monolith. Here we modify the SCM in order to consider undesirable adsorption of byproduct molecules. $TiO_2$ ALD was performed on the cylindrical alumina monolith by using titanium tetrachloride ($TiCl_4$) and water. We observed that the byproduct (i.e., HCl) of $TiO_2$ ALD can chemically adsorb on adsorption sites, unlike the behavior of the byproduct (i.e., ethane) of ZnO ALD. Consequently, the minimum exposure time of $TiCl_4$ (~16 min) was significantly much shorter than that (~71 min) of DEZ. The predicted minimum exposure time by the modified SCM well agrees with the observed time. In addition, the modified SCM gives an effective diffusion coefficient of $TiCl_4$ of ${\sim}1.78{\times}10^{-2}\;cm^2/s$ in the porous alumina monolith.

• Computers and Concrete
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• v.5 no.4
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• pp.401-416
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• 2008

The paper presents a methodology to model three-dimensional reinforced concrete members by means of embedded discontinuity elements based on the Continuum Strong Discontinuous Approach (CSDA). Mixture theory concepts are used to model reinforced concrete as a 3D composite material constituted of concrete with long fibers (rebars) bundles oriented in different directions embedded in it. The effects of the rebars are modeled by phenomenological constitutive models devised to reproduce the axial non-linear behavior, as well as the bond-slip and dowel action. The paper presents the constitutive models assumed for the components and the compatibility conditions chosen to constitute the composite. Numerical analyses of existing experimental reinforced concrete members are presented, illustrating the applicability of the proposed methodology.

• Knowledge Management Research
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• v.23 no.3
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• pp.285-311
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• 2022

In this study, based on the S-O-R framework, how individual's stimuli (i.e., video characteristics, YouTuber characteristics, real-time broadcasting characteristics of YouTube channel) form organisms (i.e., perceived usefulness, perceived pleasure, social presence), leading to viewers' responses (i.e., continuous watching intention, paid sponsorship intention) on real-time YouTube channels. For this purpose, a research model and hypotheses were constructed, and 369 questionnaire data collected from users of real-time broadcasting channel services on the YouTube platform were analyzed. Result findings confirmed that some video/YouTuber/real-time broadcasting characteristics significantly affect viewers' perceived usefulness/perceived pleasure/social presence, and further influence continuous watching/paid sponsorship intentions. Theoretical and practical implications of the findings are discussed in conclusion.

• 제어로봇시스템학회:학술대회논문집
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• 1989.10a
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• pp.1028-1034
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• 1989

A method of analysis of the steady-state performance of induction motor with supply voltage controlled by cyclically-triggered inline thyristors is presented. Phase-variable model and asymmetrical components are not used in this analysis. Instead, Fast Fourier Transform technique and the method of multiple reference frames are employed to obtain the constant-speed performance of I.M. easily.

• Journal of the Korean Institute of Telematics and Electronics
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• v.21 no.4
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• pp.58-64
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• 1984

A simple model for the impurity profile in an ion-implanted channel layer of an enhancement type IGFET is assumed and a simple expression for the threshold voltage derived by using the assumed impurity profile is analyzed in detail. Also, this simple model is applied to simulating the substrate bias dependence of its threshold voltage. Excellent agreement is obtained between theory and experiment on n-channel devices. The error range of threshold voltage between gaussian-profile and box-profile is calculated in this paper and a new method of calculating the depth of ion-implanted Baler D is also introduced.

• Journal of Korean Ophthalmic Optics Society
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• v.4 no.2
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• pp.141-146
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• 1999

We measured and analyzed thermoluminescence spectra of $LaAlO_3$, single crystal by 3 dimensional data for temperature, wavelength and luminescence intensity. $LaAlO_3$, has used as the substrates of YBCO(superconductor) or semiconductors. We could determined the energy of recombination center, that is impossible through analysis of glow curve data. We could obtained the energy through analysis of the spectrum data at peak temperature by Franck-Condon model. The total glow curve was deconvoluted to three glow curves by curve fitting method. The activation energies were 0.54eV, 0.91eV and 1.02eV respectively. The energies of recombination centers were determined with 2.04eV and 2.75eV from the analysis of luminescence intensity data for wavelength.

• Communications of the Korean Mathematical Society
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• v.16 no.4
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• pp.659-666
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• 2001

The aim of this paper is to derive the analytical so-lution of the queue: H$_{r}$/M/c/k/N for machine interference with balking and reneging, and FIFO (first in, first out) service disci-pline.e.