• Archives of Pharmacal Research
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• v.29 no.10
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• pp.845-848
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• 2006

Three new sesquiterpene hydroperoxides, 1-[3-(2-hydroperoxy-3-methylbut-3-en)-4-hydroxyphenyl]ethanone (2), $7{\beta}-hydroperoxy-eudesma-11-en-4-ol$ (3), and $7{\alpha}-hydroperoxymanool$ (4), together with three known compounds, germacrone (1), ent-germacra-4(15),5,10(14)-trien-$1{\alpha}$-ol (5) and teucdiol A (6) were isolated from the aerial parts of Aster spathulifolius (Compositae). Their structures were characterized using chemical and spectroscopic methods. The isolated compounds were tested for their cytotoxicity against five human tumor cell lines in vitro using a SRB method. The two new compounds, 3 and 4, showed moderate cytotoxicity against human cancer cells with $ED_{50}$ values ranging from 0.24 to $13.27\;{\mu}g/mL$.

• Bulletin of the Korean Chemical Society
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• v.30 no.5
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• pp.1003-1008
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• 2009

The $O_sO_4$-catalyzed dihydroxylations of a monosubstituted allylic amine and $\gamma-amino-\alpha,\;\beta-unsaturated$ (E)-esters with bulky alkyl groups showed a high anti-selectivity. Since the acyclic conformation of N-acyloxy protected allylic amines was efficiently controlled by a bulky t-Bu or OBO ester group, the anti diastereoselectivity of >12.5:1 was obtained without applying a chiral reagent. The synthetic utility of the present method was demonstrated by a stereoselective and efficient synthesis of an $\alpha$-glucosidase inhibitor 15 from commercially available N-Cbz-L-serine 6 in 11 steps and 31% yield.

• Journal of the Korean Data and Information Science Society
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• v.15 no.2
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• pp.457-465
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• 2004

Ramik[7] introduced a fuzzy goal programming (FGP)problem that generalizes a standard goal programming (GP) problem with fuzzy alternatives, fuzzy objective functions and fuzzy deviation functions for measuring the deviation between attained and desired goals being fuzzy. However, it is known that this FGP tends to produce an approximate solution since it uses an approximate fuzzy multiplication operation to solve the resultant fuzzy model. In this paper, we show that this FGP sometimes leads to the wrong decision. We also propose a procedure that gets the exact solution to overcome these problems. The method is based on $T_M$ (min norm)-based fuzzy operations using $\alpha-cut$ representations. We consider the same example as used in Ramik and investigate how our procedures are compared to Ramik's.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2000.11a
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• pp.279-282
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• 2000

The displacement current measurement has been employed to study the dielectric properties of Langmuir films. A method for determining the dielectric relaxation time $\tau$ of floating monolayers on water surface is presented. The displacement current flowing across monolayers is analyzed using a rod-like molecular model. It's revealed that the dielectric relaxation time $\tau$ of monolayers in the isotropic polar orientational phase is determined using a liner relationship between the monolayers compression speed $\alpha$ and the molecular maximum area $A_{m}$. The compression speed $\alpha$ was about 30, 40, 50mm/minmm/min

• Proceedings of the Korean Powder Metallurgy Institute Conference
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• 2006.09a
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• pp.270-271
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• 2006

Nd-Fe-B type powder was sintered using spark plasma sintering method. Fabricated compact sintered at the temperature of $700\;^{\circ}C$, is found to be a composite magnet with Nd-Fe-Co-B and ${\alpha}-Fe$. The compact sintered at $700\;^{\circ}C$ shows slightly low coercivity and large remanent magnetization comparing to the compact sintered at $600^{\circ}C$ due to the formation of ${\alpha}-Fe$ phase, resulting in the large maximum energy product. Maximum energy product tends to decrease with decreasing thickness of sintered compacts below 0.5 mm in thickness.

• Bulletin of the Korean Mathematical Society
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• v.56 no.5
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• pp.1199-1210
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• 2019

In this paper, we consider a class of inhomogeneous random intersection graphs by assigning random weight to each vertex and two vertices are adjacent if they choose some common elements. In the inhomogeneous random intersection graph model, vertices with larger weights are more likely to acquire many elements. We show the Poisson convergence of the number of induced copies of a fixed subgraph as the number of vertices n and the number of elements m, scaling as $m={\lfloor}{\beta}n^{\alpha}{\rfloor}$ (${\alpha},{\beta}>0$), tend to infinity.

• Tuberculosis and Respiratory Diseases
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• v.44 no.3
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• pp.601-610
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• 1997

Background : Monocytes/macrophages play a central role in determining the host response during Gram-negative infection through secretion of a variety of mediators after stimulation of LPS. Even though cytokine production has been shown to play an important role in host defense during sepsis, cytokine release may also lead to tissue injury. Thus, regulation of macrophage response to LPS is critical for host survival during Gram-negative sepsis. In animals exposed to nonlethal doses of endotoxin, a characteristic hyporesponsiveness to subsequent administration of endotoxin has been observed. This phenomenon was known as 'LPS tolerance'. However, little information is available regarding the underlying mechanism of LPS tolerance. Method : Peripheral blood monocyte(PBMC) was isolated from peripheral blood of normal volunteers by adhesion purification method. To evaluate the conditions to obtain LPS tolerance, preculture was carried out with LPS at 10ng/ml for 24 hours. For stimulation, culture plates were washed two times and were stimulated with LPS at $1{\mu}g/ml$ for 4, 6 and 26 hours. To assess the underlying mechanisms of LPS tolerance, autologous serum, PMA, anti-CD14 Ab, Indomethacin or $PGF_2$ were added to preculture solution respectively. Cytokine concentrations in culture supernatants were measured using ELISA for TNF-$\alpha$ and IL-8 and mRNA of TNF-$\alpha$ and IL-8 were determined by Northern blot analysis. Results : The exposure of PBMC to low dose of LPS suppressed the cytokine production and mRNA expression of TNF-$\alpha$, but not IL-8. Anti-CD14 Ab partially recovered production of TNF-$\alpha$ which was suppressed by preculture with low dose LPS. The preculture with PMA induces LPS tolerance, as preculture with low dose LPS. Conclusion : LPS tolerance to TNF-$\alpha$ is regulated pretranslationally and is influenced by protein kinase C pathway and CD14.

• Herbal Formula Science
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• v.20 no.1
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• pp.25-40
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• 2012

The purpose of this study explain the experimental effects of Guizhishaoyaozhimu-Tang (桂枝芍藥知母湯) that have clinical efficacy in rheumatoid Arthritis. Materials of present study were Guizhishaoyaozhimu-Tang freeze dried powder (GSZT), Sprague-dawley rats (300 g or so, male), various kinds of needing experimental studis. In order to study the therapeutic effects of GSZT, this Prescription (GSZT 500 mg/kg, 1,000 mg/kg) were administered per oral to the rats with the arthritis induced by Freund's complete adjuvant ($0.2m{\ell}/kg$), several experimental items were measured and compared each other ; that is body weight, rate of edema, analgesic effect by hot plate method, WBC, total protein, TNF-${\alpha}$, IL-10 and expression and localization of H&E, COX-2 staining in synovial tissues from rat with rheumatoid arthritis by immunohistochemical staining using polyclonal COX-2 antibodies. Rats were divided into four groups. Normal group was not treated with Freund's complete adjuvant and treated with DDW 1.0 $m{\ell}$, Control group was treated with Freund's complete adjuvant 0.2 $m{\ell}/kg$ and DDW 1.0 $m{\ell}$, Sample A group was treated with Freund's complete adjuvant 0.2 $m{\ell}/kg$ and GSZT (500 $mg/m{\ell}$) $1.0m{\ell}$, Sample B group was treated with Freund's complete adjuvant 0.2 $m{\ell}/kg$ and GSZT (1,000 $mg/m{\ell}$) 1.0 $m{\ell}$. 0 was day that did not start experiment, 14 was day that confirmed rheumatism induced by Freund's complete adjuvant, 28 was day that completed experiment. The following results were obtained in this study ; Sample A group was increased in body weight, escape time and paw licking time statistical significance compared with Control group, and were decreased in edema, WBC, total protein, TNF-${\alpha}$ with statistical significance compared with Control group. Sample B group was increased in escape time with statistical significance compared with Control group, and were decreased in edema, WBC, total protein with statistical significance compared with Control group. Sample A and Sample B groups were increased in IL-10 compared with Control group, and Sample B group was decreased in TNF-${\alpha}$ compared with Control group. And, Control, Sample A and Sample B groups were showed considerable reduction of positive expression in comparison to Normal group. Especially, Sample B group was most significantly reduction of positive expression than the other groups. From above results, I suggest that GuizhiShaoyaoZhimu-Tang can be used for curing rheumatoid arthritis.

• Korean Journal of Microbiology
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• v.33 no.4
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• pp.257-261
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• 1997

To scrutinize the bacterial community composition of Lake Soyang in winter, bacterial numbers belonging to Eubacteria, Proteobacteria and Cytophaga-Flavobacterium group were estimated by using 16S and 23S rRNA targeted oligonucleotide probes. Total bacterial numbers ranged from $0.7{\times}10^6$ to $1.1{\times}10^6cells{\cdot}ml^{-1}$, and vertical profile of total bacteria showed a peak at 5 m depth. The ratio of eubacteria to total bacteria were 34~90% and at 5 m and 10 m depths those were low exhibiting, 39 and 34%, respectively. The percentage of proteobacteria ${\alpha}$-group ranged 10.8~28.7%, ${\beta}$-group 4.5~53.5%, ${\gamma}$-group 4.9~35.5% and Cytophaga-Flavobacterium group 6.1~21.1%. The dominant groups were ${\beta}$-group at 0, 2 and 5 m, ${\gamma}$-group at 10 m, ${\alpha}$-group at 30 m and Cytophaga-Flavobacterium group at 50 m depth. In winter season, Lake Soyang can be divided into three layer, 0~2 m, 5~10 m and 30~50 m, by the bacteria community composition. By this method, new informations about aquatic ecosystem were developed.

• The Korean Journal of Pharmacology
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• v.29 no.1
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• pp.139-148
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• 1993

Both SCC 12 and SCC 13 cell lines were derived from squamous cell carcinoma (SCC) of the skin (Wu and Rheinwald, 1981). In the present study, we compared the inherent invasive activity in their raft cultures where most in vivo characteristics of epidermis can be reproduced by cell culture method. The raft culture of SCC 12 cell line produced many invading colonies within the collagen lattice and basal-like cells in the middle of differentiating cell layers, but no invasive activity was observed in the SCC 13 raft culture. We investigated which factors are implicated in inherent invasive activity of SCC 12 cell line by examining basal levels of type I collagenase, EGF receptor, fibronectin, and its receptor in two cell lines. Among them, only type I collagenase was significantly higher in invasive SCC 12 cells than in non-invasive SCC 13 cells. Furthermore, we tried to investigate mechanisms underlying between SCC 12 cell's inherent invasive activity and its high basal level of type I collagenase. As one of them, discrepancy in TGF alpha mediated responses between two cell lines was observed. In SCC 13 cells, TGF alpha initially stimulated type I collagenase at 12 h after TGF alpha treatment and then its down regulation was followed from 24 h even though TGF alpha was continuously present in the medium. However in SCC 12 cells, TGF alpha continuously stimulated type I collegenase up to 48 h. We propose that defect in EGF receptor's down-regulation may be involved in lack of type I collagenase's down-regulation and its possible connection to invasive activity of SCC 12 cell line.