• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 2003.10a
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• pp.21-24
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• 2003

In hot forming process of the backward end-bulkhead of a pressure hull, the blank diameter and the tool clearance are the critical factors which influence wrinkling defect, forming load and shape completeness of the product. Two F.E.A softwares with the elasto-plastic material model and rigid plastic model were utilized to predict the occurrence of wrinkling defect. Tool clearance was determined by considering the increase of blank thickness, die strength and the stretching effect. Heat treatment condition after the hot forming to recover the original properties of the material was estabilished by specimen-based heat treating experiment.

• Journal of the Korean Home Economics Association
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• v.41 no.9
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• pp.43-54
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• 2003

The purpose of study is to survey the system of the Korean Gangsin-mu shaman costume and its formative character and to fine out the traditional follow patterns of government officials' attires and Po's meaning of it. The overall shape of variety 'Po's in modern times are similar to the traditional ones, but they differ greatly in size, detail color, and ornamental design. The sleeves have slits in the armholes, which can allow the hands to be drawn out easily. In addition, the knot buttons are used in the modern costumes. They are based on different formation skills from those of the traditional The original color of the shaman's costume is not their taste in color but symbolic, modern costumes color show the shaman's taste in color. This change mean a more accentuated visual effect than incantatory meaning. Another reason for color change is also the costume's material. A kind of constituent element uses synthetic fiber in modern times.

• The KSFM Journal of Fluid Machinery
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• v.2 no.3 s.4
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• pp.17-23
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• 1999

In the present numerical analysis, investigation of the effect of blade loadings from design shape on the slip factor variation was studied. Both the Eckardt radial bladed impeller and the backswept impeller were analyzed. In addition, a new design of the blade profile was arbitrarily attempted to generate a center-loading pattern in the original backswept impeller. Three dimensional compressible Navier-Stokes flow analysis with the Baldwin-Lomax turbulence model was applied to get the numerical slip factor at each impeller exit plane using the mass-averaging technique. The numerical slip (actors are in good agreement with the experimental ones and the Wiesner's slip factors deviate further from the numerical and experimental ones in both backswept impellers. Deviation angles and meridional channel loadings are found in no relation with the trend of change of the slip factor. Blade-to-blade loadings in midspan location are, however, found to have a direct relationship, especially at the sections where maximum loadings we to be expected. That information can be utilized in establishing an improved expression for slip factors in the future.

• Journal of Fashion Business
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• v.14 no.1
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• pp.116-131
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• 2010

As our world is becoming more and more globalized, nations tend to turn their interests towards their unique legacy and traditional culture. This research is intended to re-illuminate the Korean beauty through the Lotus Pattern, a traditional factor, from the Chosun Dynasty, and at the same time, analyze how its peculiar representation and figural elements can be reflected in modern fashion designs. The results will be an essential factor in creating exclusive and original designs. Research method was theoretical research from documents and to refer to positive data on preserved relics, and research contents consists of analysis on the use of lotus patterns in artworks that were exhibited during 2000 to 2008 by Korean and foreign artists. Results showed that lotus patterns that were used during the Chosun Dynasty are categorized by shape, composition form, and structural form. Applying these results, a total of 8 works were designed and created.

• Korean Journal of Pharmacognosy
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• v.6 no.3
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• pp.125-129
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• 1975

The pharmacognostical and pharmacological studies of 'Manryong' were carried out, which has been widely used in Chun-Ra Province, Korea and the following results were obtained. 1) The original plant of the bulb MANRYONG is Erythronium japonicum DECNE. (Liliaceae). 2) The internal structure consists of mostly parenchyma containing numerous starch grains, vascular bundles and substituted fibers. 3) The external surface occurs as a yellowish white and slightly bented ovoidal shape. 4) 'Manryong; contains 11 kinds of free amino acids, such as asparagin, tryptophan, cystine, glutamic acid, threonine, glycine, leucine, proline, histidine, methionine, and alanine. 5) Hemolytic action of the crude saponin isolated from 'Manryong' is weaker than that of digitonin. 6) Effects of 'Manryong' extracts on ceruloplasmin were studied and an antidotal activity of the extracts was found in liver intoxicated with carbon tetrachloride.

• Journal of the Korean Society for Precision Engineering
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• v.26 no.3
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• pp.113-121
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• 2009

Behavior of a package of a microwave oven under the clamping condition is evaluated by tests and the finite element analyses. PAM-CRASH software is used for the finite element analyses. Results of the analyses are compared with those of the tests and accuracy is shown to be favorable. Under the clamping condition of the original design, severe deformation occurs and an improved design of the outer case and upper EPS(Expandable Poly Styrene) is proposed to reduce it. Face beads of the outer case are introduced and shape of the upper EPS is modified to reduce the deformation resulting from the clamping load. The improved design model is analyzed and its deformation is shown to be satisfactory. A prototype is produced according to the improved design and tests are performed. Results of the clamping test of the prototype show that the plastic deformation is removed totally.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2005.06a
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• pp.1812-1818
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• 2005

Even though SMA actuators have high power to volume ratio, there exist disadvantages such as hysteresis and saturation. So the model identification for SMA actuators is very difficult. For the qualitative model identification, we described the behavior of SMA actuators using a so-called diagonal model, which can readily expect the turning point of an incomplete phase transformation. For the quantitative model identification, we developed the general dynamics of SMA actuators using the modified Liang's model. Using this dynamics we can describe the hysteresis and the saturation very well. It is also very important to notice that the modified Liang's model maintains a continuous martensite fraction at the change of the phase transformation but the original model cannot.

• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 2003.05a
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• pp.96-98
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• 2003

The evolution of texture and microstructure during continuous confined strip shearing (CCSS) in aluminum 3003 alloy sheets was investigated. The tools of CCSS based on the equal channel angular pressing (ECAP) were designed to provide a constant shear deformation of the order of 0.5 per pass while preserving the original sheet shape. FEM results indicated that the shear formation is not homogeneous throughout the sample thickness, in particular at the surface layers. A randomization of textures took place during the CCSS deformation. Observations by TEM and EBSD revealed the formation of sub-micrometer sized grains after CCSS.

• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 2003.05a
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• pp.323-326
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• 2003

This paper presents a new algorithm that can refine hexahedral elements while maintaining the appropriate connectivity. In the algorithm, at first the regions of mesh to be refined are defined and, then, the zero-thickness element layers inserted into the interfaces between the regions. All the meshes in the regions, in which the zero-thickness layers are inserted, are to be regularized in order to improve the shape of the slender elements on the interfaces. This algorithm is applied to the analysis of plastic deformation process. The results show that the refined mesh gives smaller relative errors than the original mesh.

• Proceedings of the Korean Nuclear Society Conference
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• 1997.05a
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• pp.392-399
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• 1997

An approximation technique was developed for the simulation of free surface flows in non-orthogonal coordinates. The main idea of this approach is to approximate VOF by the second order linear equation in the transformed domain on the assumption that the continuity of free surface would be maintained. The method was justified through a set of numerical test to examine if its original shape could be maintained when the circles are convected in uniform velocity in horizontal direction in curvilinear coordinates. Finally a simple problem was solved by applying the method to CFX4.1 general purpose CFDS code.