• Proceedings of the Zoological Society Korea Conference
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• 1999.10b
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• pp.246.2-246
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• 1999

No Abstract, See Full Text

• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.887.1_888.1
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• 2009

This paper proposes a core loss analysis method to obtain high accuracy prediction by using Multi-curve representing magnetic properties of a electrical steel in Finite Element Analysis (FEA). Generally, the magnetic prosperities of the electrical steel are measured by Epstein Method based on the international standards that are not good sufficient to predict motor performances. The method only aims to grade products in steel companies The magnetic properties of actual stator core is highly different to those given by steel companies due to the fact that stacking effect, shearing stress, nature anisotropy of electrical steels are not taken into account. In this paper, the magnetic properties are variously measured by three measuring devices, and then the several BH curves and BW curves obtained are used to analyze the core loss of a IPM. The BH curve in the high magnetic field are extrapolated using the mathematical formulation with the maximum saturation magnetic polarization measured

• Journal of Plant Biotechnology
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• v.47 no.2
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• pp.150-156
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• 2020

Weeds play an important role in the survival of viruses and are potential inoculum sources of viral diseases for crop plants. In this study, specimens of Pseudostellaria heterophylla exhibiting symptoms of the cucumber mosaic virus (CMV) were collected in Bonghwa, Korea. The characteristics of the disease were described and leaf RNA was extracted and sequenced to identify the virus. Three CMV contigs were obtained and PCR was performed using specific primer pairs. RNA from positive samples exhibiting CMV leaf symptoms was amplified to determine the coat protein. A sequence comparison of the coat protein gene from the CMV BH isolate shared the highest nucleotide identity (99.2%) with the CMV ZM isolate. Phylogenetic analysis showed that CMV-BH belonged to subgroup IA and that the most closely-related isolate was CMV-ZM. All test plants used for the biological assay were successfully infected with CMV and exhibited CMV disease symptoms such as blistering, mosaic, and vein yellowing. To our knowledge, this is the first report of CMV infection in P. heterophylla from Korea.

• Journal of Korea Technical Association of The Pulp and Paper Industry
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• v.29 no.2
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• pp.36-45
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• 1997

Newly bleaching sequence using oxygen, ozone and hydrogen peroxide has introduced to avoid pollution hazards from chlorinated organic compounds, because chlorine dioxide substitution bleaching was produced a little chlorinated organic substance. Oxygen-type chemicals replaced for chlorine has attracted much research attention. Bleachability of ozone was improved at low temperature and high pulp consistency. In third bleaching followed OZ bleaching, addition of O2 and NaBH4 in alkali extraction was effective than only alkali extraction. Bleachability of pulps in ozone bleaching(Z) was improved at higher consistency and lower temperature The addition O2 and NaBH4 in alkali extraction after OZ bleaching sequence improved brightness, when compared to those obtained by only alkaline extraction. Pulps bleached by ECF bleaching sequences such as OZEoD and OZEopD was obtained by 90% ISO brightness. The brightness of pulp bleached by TCF sequences with the ozone dosage of 1.6% was approached to target brightness (88~90%ISO). Pulps bleached Z stage combined bleaching sequence was reduced the viscosity to a little greater extent. However, physical properties of pulps was not great different compared to those bleached by conventional bleaching sequences. A pollution index of bleaching effluente by ozone combined bleaching sequences was lower than by conventional bleaching sequence, but somewhat higher than multistage bleaching sequences combined C/D stage.

• Journal of Microbiology and Biotechnology
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• v.28 no.3
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• pp.491-497
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• 2018

Lipopolysaccharide (LPS), a component of the cell wall of gram-negative bacteria, elicits the secretion of cytokines, such as interferons, that stimulate the host defense system. Previously, we demonstrated that interferons induce interferon regulatory factors (IRFs) 1, 3, and 7, which regulate the transcription of Noxa and alter the expression profiles of Bcl-2 family proteins in tumors. However, the immediate consequences of LPS stimulation on Noxa and BH3 expression in tumor cells remain uncharacterized. In this study, we determined that LPS induced Noxa expression in CT26 cells. Furthermore, studies in HCT116 parental and HCT116 p53-deficient cells revealed that LPS-mediated Noxa was independent of p53. Meanwhile, IRF1, 3, and 7 in CT26, HCT116 parental, and HT116 p53-deficient cells were upregulated by LPS stimulation, suggesting that LPS induces the expression of these IRFs in a p53-independent manner. The responsiveness of IRF1, 3, 4, and 7 binding to the Noxa promoter region to LPS indicated that IRF1, 3, and 7 activated Noxa expression, whereas IRF4 repressed Noxa expression. Together, these results suggest that LPS directly affects Noxa expression in tumor cells through IRFs, implicating that it may contribute to LPS-induced tumor regression.

• Journal of the Korean Magnetic Resonance Society
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• v.14 no.1
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• pp.38-44
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• 2010

In liquids NMR, $^{1}H$ is the most widely observed nucleus, which is not the case in solids NMR. The reason is due to the strong homo-dipolar interactions between the hydrogen atoms which mask the useful chemical shift information. Therefore we must remove the strong homo-dipolar interactions in order to get structural information, which can be investigated by the isotropic chemical shift. There are two ways of obtaining it. One is the ultra-fast MAS of ca. 70 kHz spinning speed, which has become available only recently. The other way is devising a pulse sequence which can remove the strong homo-dipolar interaction. In the latter way, MAS with a moderate spinning rate of a few kHz, is enough to remove the chemical shift anisotropy. In this report, 1D-CRAMPS and 2D MASFSLG techniques are utilized and their results will be compared. This kind of highresolution $^{1}H$ NMR for solids, should become a valuable analytical tool in the understanding and the developing of a new class of hydrogen storage materials. Here ammonium borane $-NH_{3}BH_{3}$, whose hydrogen content is high, is used as a sample.

• BMB Reports
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• v.39 no.5
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• pp.556-559
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• 2006

The Bcl-2 family of proteins regulates mitochondrial functions during cell death by modulating the efflux of death-promoting proteins such as cytochrome c and endonuclease G. Upon the binding of death ligands to their receptors, caspase-8 cleaves Bid, a BH3-only protein, into tBid that causes the mitochondrial damages resulting in the release of cytochrome c and endonuclease G. Also, another BH3-only protein, hNoxa, has been shown to induce the efflux of cytochrome c from the mitochondria. Whether the efflux proteins from the mitochondria in response to tBid or hNoxa are the same or different, however, has not been addressed. We have demonstrated that endonuclease G activities are not detectable among the proteins released from isolated mitochondria by hNoxa but are detectable in that by tBid. These results suggest that the efflux of proteins from the mitochondria are differentially modulated by tBid and hNoxa.

• Applied Chemistry for Engineering
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• v.26 no.6
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• pp.743-745
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• 2015

Amorphous cobalt phosphates were synthesized with their distinct morphology by controlling the amount of base in the synthetic condition. The crystallinity and morphology of cobalt phosphates were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The prepared cobalt phosphates were applied as a heterogeneous catalyst for generating hydrogen gas from the hydrolysis reaction of sodium borohydride. We found that the catalyst prepared using the least amount of base condition at room temperature showed a plate shape with less than 10 nm thickness, which resulted in the best catalytic activity among all catalysts due to the large surface area.

• Journal of the Korean Chemical Society
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• v.61 no.5
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• pp.244-250
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• 2017

Reduction of (${\pm}$)-3-ketoproline ethyl ester (1) by $NaBH_4$ in the presence of $CaCl_2$ and $MgCl_2$ as the chelating agents gave selective products cis-3(R/S)-alcohols, while reduction by $NaBH_4$ alone or chelated with $NiCl_2$ and $AlBr_3$ gave mixtures of cis- and trans-alcohols. The reduction of (${\pm}$)-1 by various vegetables however, gave exclusively the cis-alcohol as the major and trans-alcohol as the minor. On the contrary, reduction of (${\pm}$)-1 by carrot afforded a mixture of cis- and trans-alcohols, in which the trans-alcohol exists as the major product. In addition, we found that this biocatalyst selectively converted S-enantiomer of (${\pm}$)-1 to the cis-alcohol, and R-enantiomer to a mixture of cis- and trans-alcohols with cis-alcohol as the major product. This fact prompted us to use various fresh plant tissues for stereoselective reduction of diverse types of pyrrolidinones, as its stereoselectivity towards racemic mixtures is higher compared to that using chemical reducing agents.

• Proceedings of the KSEG Conference
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• 2005.04a
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• pp.157-164
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• 2005

BIPS와 Televiewer를 이용하여 10개의 지하수 관측공에서 획득된 1,591개 불연속면을 분석하여 지하수 유동과의 관계를 비교${\cdot}$분석하였다. 연구지역 내의 지형은 산계가 잘 발달된 계곡형 지형이며, 수계의 발달은 매우 미약하다. 연구지역 주변에는 북북동-남남서 방향의 양산단층과 동래단층이 발달되어 있으며, 연구지역 내에는 EW방향의 선구조도 발달되어 있다. 지하수공내에서 조사된 불연속면의 주 방향은 위성사진에서 판독된 선구조의 방향과 대부분 일치한다. 지구통계기법을 이용하여 작성된 지하수위 등고선도에서 추정된 지하수 유동방향과 유향${\cdot}$유속기에서 측정된 지하수 유향은 거의 일치하지만, 단열암반에 발달된 불연속면의 방향과 지하수 유동방향은 2가지로 해석되었다. 첫째는 단열암반에 발달된 불연속면의 방향과 지하수 유동방향이 잘 일치하는 경우(BH-01, 03, 04, 12공), 둘째는 불연속면의 방향과 지하수 유동방향이 잘 일치하지 않는 경우(BH-02, 05, 07, 11) 이다. 지하수 유동방향이 불연속면의 방향과 일치하지 않는 경우는 지형의 변화에 더 영향을 받는 것으로 나타났다. 따라서 단열암반 내에서 지하수의 유동은 단열의 방향성에 영향을 받지만, 지형의 특성에도 큰 영향을 받는다.