• Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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• 2001.10a
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• pp.220-226
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• 2001

It is important to estimate exactly wave forces acting on various types of offshore structures under the severe environmental conditions in the ocean site. This paper presents an easy experimental method which deals with transient waves. The proposed scheme made it possible to generate breaking waves at any position in the wave tank by changing the maximum slope of the component waves. The theoretical and experimental methods were investigated by generating concentrated waves which acted on a single and multiple cylinders. The waves forces increased rapidly when the models encountered breaking waves. The theoretical results underestimates the forces due to breaking waves. Therefore, the effects due to breaking waves should be considered carefully in the design process of a structure under the influence of breaking waves.

• Proceedings of the KSME Conference
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• 2004.11a
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• pp.79-84
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• 2004

Strain energy due to the mechanical interaction between self-accommodation groups of martensitic phase transformation is called interaction energy. Evaluation of the interaction energy should be accurate since the energy appears in constitutive models for predicting the mechanical behavior of shape memory alloy. In this paper, the interaction energy is evaluated in terms of theoretical formulation and explicit finite element calculation. A simple example with two habit plane variants was considered. It was shown that the theoretical formulation assuming elastic interaction between the self-accommodation group and matrix gives larger interaction energy than explicit finite element calculation in which transformation softening is accounted for.

• Journal of the Korean Society of Clothing and Textiles
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• v.25 no.4
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• pp.685-696
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• 2001

The purpose of this study was to establish the marketing strategy, that strengthens the brand royalty of their own in apparel industry and that can induce consumers brand switching against competitive brand. This study was classified into theoretical and experimental study. Experimental study was done, using the survey, to prove the models for consumers responses to brand switching by the theoretical study. It analyzed at last five hundred ninety-two women in the age of twenty to thirty years old who live in Seoul. Followings are the summary of the results revealed through the experimental study. First, brand switching behavior of consumers for formal dress was attributed to two extremes the inner motivation of variety seeking tendency and communication contact, complex variety seeking group, true variety seeking group, derived variety seeking group, and variety avoiding group. Second, the cognition response to marketing communication the types of brand switching shows difference in all communication variables except the service promotion of sales promotion communication. As to attitude response, it was found meaning difference in all communication variables except the sales promotion through price adjustment.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.26 no.8
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• pp.1591-1598
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• 2002

This paper reports on the effects of crankshaft offset on the engine friction. The effects of crank offset are investigated through the theoretical analysis. In this study, the mathematical models are presented fer evaluationg the friction level of each engine parts. Crank offset influences on the side force acted on the piston pin and sliding speed of piston. Crank offset is very effective to reduce the piston skirt friction. With application of crank offset, total engine friction decreases at low engine speed, but that increase as engine speed increases.

• Journal of Ocean Engineering and Technology
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• v.15 no.4
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• pp.8-13
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• 2001

It is important to estimate exactly wave forces acting on various types of offshore structures under the severe environmental conditions in the ocean site. This paper presents an easy experimental method which deals with transient waves. The proposed scheme made it possible to generate breaking waves at any position in the wave tank by changing the maximum slope of the component waves. The theoretical and experimental methods were investigated by generating concentrated waves which acted on a single and multiple cylinders. The waves forces increased rapidly when the models encountered breaking waves. The theoretical results underestimates the forces due to breaking waves. Therefore, the effects due to breaking waves should be considered carefully in the design process of a structure under the influence of breaking waves.

• Journal of the Korean Institute of Landscape Architecture
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• v.24 no.1
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• pp.55-64
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• 1996

The size of leisure space has been determined on the basis of the annual and peak day's number of visitor, turnover rate, and size per visitor. But the past models have no theoretical base and practical errors on the many cases. So, this study was carried out to build and test a new theoretical model for selecting a optimal size of theme park. The basic concept of the model building is the break-even point analysis of cost-volume-profit relation. That is, Gain-Loss of theme park is determined by marginal profit and fixed cost by size. YongIn Farmland was selected as a model test case.

• The Transactions of the Korea Information Processing Society
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• v.7 no.6
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• pp.1852-1860
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• 2000

Distinct from the Markov random field or pseudo 2D HMM models for image analysis, this paper proposes a new model of 2D hidden Markov mesh chain(HMMM) model which subsumes the definitions of and the assumptions underlying the conventional HMM. The proposed model is a new theoretical realization of 2D HMM with the causality of top-down and left-right progression and the complete lattice constraint. These two conditions enable an efficient mesh decoding for model estimation and a recursive maximum likelihood estimation of model parameters. Those algorithms are developed in theoretical perspective and, in particular, the training algorithm, it is proved, attains the optimal set of parameters.

• International Journal of Aeronautical and Space Sciences
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• v.3 no.2
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• pp.24-30
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• 2002

This paper demonstrates a comparison of linear and nonlinear analyses for thermo-optic effects of optical temperature sensor based on the etched silica-based planar waveguide Bragg grating. Topics include theoretical analyses and experiment of the etched planar waveguide Bragg grating optical temperature sensor. Theoretical models with nonlinear than linear temperature effect for the grating response based on waveguide and plate deformation theories agree with experiments to within acceptable tolerance.

• Journal of the Korean Society for information Management
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• v.8 no.2
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• pp.125-138
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• 1991

This paper focuses on issues in the relat~onshlp of library and information science with a closely allied chsciphne, communication studies. It is obvious that researchers in both fields study topics similar in focus, such as information theory, information-seeking behavior includ~ng user studies, systems theory, invisible colleges, the diffusion of knowledge, human interaction with information /communication technologies and the information society. In order to discuss the comparison of theoretical

• Wind and Structures
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• v.2 no.4
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• pp.325-345
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• 1999

In recent years, rainscreen walls based on the pressure equalization principle are often used in building construction. To improve the understanding of the influence of several design parameters on the pressure equalization performance of such wall systems, a theoretical consideration of the problem may be more appropriate. On this basis, this paper presents two theoretical models, one based on mass balance and the other based on the Helmholtz resonator theory, for the prediction of cavity pressure in rigid rainscreen walls. New measures to assess the degree of pressure equalization of rainscreen walls are also suggested. The results show that the model based on mass balance is sufficiently accurate and efficient in predicting the cavity pressure variations. Further, the performance of the proposed model is evaluated utilizing the data obtained from full-scale tests and the results are discussed in detail.