• Journal of Mechanical Science and Technology
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• v.20 no.1
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• pp.94-109
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• 2006

An improved meshfree method called the Petrov-Galerkin natural element (PG-NE) method is introduced in order to secure the numerical integration accuracy. As in the Bubnov-Galerkin natural element (BG-NE) method, we use Laplace interpolation function for the trial basis function and Delaunay triangles to define a regular integration background mesh. But, unlike the BG-NE method, the test basis function is differently chosen, based on the Petrov-Galerkin concept, such that its support coincides exactly with a regular integration region in background mesh. Illustrative numerical experiments verify that the present method successfully prevents the numerical accuracy deterioration stemming from the numerical integration error.

• Korean Journal of Clinical Pharmacy
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• v.3 no.2
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• pp.157-162
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• 1993

The present study was designed to examine the effect of tested preparation, WY-91 (consisting of ginseng extract, ganoderma extract and Royal jelly) on alcohol-induced unusual metabolism(such as blood glucose(BG), triBlyceride(TG), and blood urea nitrogen(BUN) level in blood) and nrperinlental liver injury($CCl_4$ and high fat diet) in mice. WY-91 lowered the level of blood glucose (BG),triglyceride(TG) and blood urea nitrogen(BUN) induced by alcohol in a dose-dependent manner. This preparation could protect hepatic function from a damages caused by high fat diet and $CCl_4$ administration(p.o.).

• Journal of Astronomy and Space Sciences
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• v.21 no.3
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• pp.191-200
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• 2004

The accuracy of CCD observations obtained at the Korean 1.8m telescope has been studied. Seventeen comparison stars in the vicinity of the cataclysmic variable BG CMi have been measured. The 'artificial' star has been used instead of the 'control' star, what made possible to increase accuracy estimates by a factor of 1.3-2.1 times for 'good' and 'cloudy' nights, respectively. The algorithm of iterative determination of accuracy and weights of few comparison stars contributing to the artificial star, has been presented. The accuracy estimates for 13-mag stars are around $0.^m002$ mag for exposure times of 30 sec.

• Journal of Microbiology and Biotechnology
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• v.10 no.5
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• pp.721-723
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• 2000

The phospholipase $A_2$-catalyzed transesterification of phosphatidylcholine (PC, 95%) with nervonic acid (NA, 95%) was successfully carried out in an organic solvent. The maximum yield after 48 h was 10.3% (w/w) at $50^{\circ}C$ with an initial water activity ($a_w$) of 0.16, and a molar ratio of NA to PC of 20 in 5 ml ethyl acetate.

• Journal of Microbiology and Biotechnology
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• v.1 no.4
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• pp.227-231
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• 1991

A gene coding for a $\beta$-galactosidase of Bacillus subtilis HP-4 was cloned in E. coli JM109 by inserting HindIII digested fragment of B. subtilis HP-4 chromosomal DNA into the site of pBR322 and selecting recombinant transformant showing blue color on X-gal plate. The recombinant plasmid, named pBG109, was found to contain the 1.4 Kbp HindIII fragment originated from B. subtilis HP-4 chromosomal DNA by Southern hybridization. The cloned gene was stably maintained and expressed in E. coli JM109 and the pBG109 encoded $\beta$-galactosidase had the same enzymatic properties as those of $\beta$-galactosidase produced by B. subtilis HP-4.

• Proceedings of the Korea Information Assurance Society Conference
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• 2004.05a
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• pp.59-64
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• 2004

In this paper a design and an implementation of a crypto chip which implements SEED and Triple-DES algorithms are described. We designed it by VHDL(VHSIC Hardware Description Language) which is a designed system-description language. To apply the chip to various application, four operating Modes such as ECB, CBC, CFB, and CFB are supported. The chip was designed by the Virtex-E XCV2000E BG560 of Xilinx and we confirmed result of it at the FPGA implementation by functional and timing simulation using the Xilinx Foundation Series 3.li.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2006.10a
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• pp.315-316
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• 2006

• The Journal of the Petrological Society of Korea
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• v.2 no.1
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• pp.41-52
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• 1993

We report adventages of employing MgO as a differentiation index for the Namwon granitic complex. It is shown to be much more sensitive than the usual Harker index. The complex can be divided into two groups on the basis of $TiO_2$/MgO ratio. The low $TiO_2$/MgO group consists of hornblende biotite tonalite-granodiorite, porphyritic hornblende biotite granodiorite (PHBGd) and part of biotite granite (loBG). PHBGd shows its own distinct variation in the low group. This group is characterized in most cases by the presence of hornblende, even if it occurs as a trace amount. The high $TiO_2$/MgO group consists of part of biotite granite (hiBG) and two mica granite. The major element differences between rock types are also apparent in biotite chemistry. These chemical data indicate that at least two distinct origins of magma are rquired for the complex. Two kinds of biotite granite revealed in this study show distinct geographic distribution, suggesting that a new geologic map should be made.

• Proceedings of the KSME Conference
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• 2003.11a
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• pp.1274-1279
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• 2003

In this paper, a new meshfree technique which improves the numerical integration accuracy is introduced. This new method called the Petrov-Galerkin natural element(PG-NE) is based on the Voronoi diagram and the Delaunay triangulation which is based on the same concept used for conventional natural element method called the Bubnov-Galerkin natural element(BG-NE). But, unlike BG-NE method, the test shape function is differently chosen from the trial shape function. The proposed technique ensures that the numerical integration error is remarkably reduced.

• Journal of the Korean Society for Precision Engineering
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• v.26 no.4
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• pp.33-38
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• 2009