• Korean Journal of Mathematics
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• v.23 no.1
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• pp.181-197
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• 2015

In this paper, we investigate Lipschitz and asymptotic stability for perturbed nonlinear differential systems.

• Korean Journal of Mathematics
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• v.23 no.2
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• pp.269-282
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• 2015

In this paper, we investigate bounds for solutions of perturbed functional differential systems using the notion of $t_{\infty}$-similarity.

• 대한치주과학회:학술대회논문집
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• 2006.05a
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• pp.23-23
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• 2006

• The Korean Journal of Food And Nutrition
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• v.23 no.2
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• pp.135-140
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• 2010

Acorns have been used as a traditional remed as well as food source. However, few studies on their immunomodulating effects have been reported. In this study, the combined immunomodulative effect of a water extract of acorns was tested on seven to eight weeks old mice(balb/c). The mice were fed ad libitum on a chow diet, and a water extract of the plant mixture was orally administered every other day for four weeks at two different concentrations(50 and 500 mg/kg B.W.). The production of cytokine(IL-$1{\beta}$, IL-6, IL-2, IL-10, IFN-$\gamma$), secreted by macrophages stimulated with LPS or not, detected by ELISA assay using cytokine kit. After 48 h of incubation with mitogen(ConA or LPS) ex vivo study showed that cytokine (IL-$1{\beta}$, IL-6, IL-2, IL-10, IFN-$\gamma$) was detected in both of the 50 and 500 mg/kg B.W. supplementation groups with LPS stimulation. The results of this study may suggest that supplementation with acorn water extract increase immune function by regulating cytokine production capacity by activated macrophages.

• Journal of Life Science
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• v.23 no.5
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• pp.682-688
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• 2013

We investigated a physiological function by fermenting a medicinal mushroom, (Cudrania tricuspidata fruit). A fermentation using lactic acid bacteria and the extracts isolated from 70% ethanol fractionation was included in cultured mouse spleen cells for cytokine secretion. As a result, total polyphenol content improved by 47% by organic acid fermentation. This was regarded as immune activity in fermented C. tricuspidata fruits, as the levels of interleukin (IL)-2 and IL-4 secretion increased. In addition, when the extracts were treated with a stimulant lipopolysaccharide, the secretion of helper T (Th) 1 cytokines IL-2, IL-12, and tumor necrosis factor-${\alpha}$ was suppressed, while the secretion of Th2 cytokines IL-4, IL-5, IL-6, and IL-10 significantly increased. Therefore, this study suggests that fermentative C. tricuspidata fruit extracts can contribute to the suppression of cellular immune reactions induced by the expression of Th1 cells and activation of the expression of Th2 cells inducing humoral immune reactions associated with the antibody generation by B lymphocytes.

• Tuberculosis and Respiratory Diseases
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• v.44 no.4
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• pp.822-835
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• 1997

Background : There have been many in vitro evidences that interleukin-4(IL-4) might be the most important cytokine inducing IgE synthesis from B-cells, and interferon-gamma(IFN-$\gamma$) might be a main cytokine antagonizing IL-4-mediated IgE synthesis. Recently some reports demonstrated that IFN-$\gamma$ might be used as a new therapeutic modality in some allergic diseases with high serum IgE level, such as atopic dermatitis or bronchial asthma. To evaluate the in vivo effect of IFN-$\gamma$ in bronchial asthma we tried a clinical study. Methods : Fifty bronchial asthmatics(serum IgE level over 200 IU/ml) who did not respond to inhaled or systemic corticosteroid treatment, and 17 healthy nonsmoking volunteers were included in this study. The CD 23 expressions of peripheral B-cells, the IL-4 activities of peripheral T-cells, the serum soluble CD23(sCD23) levels, and the superoxide anion(${O_2}^-$) generations by peripheral PMN were compared between bronchial asthmatics and normal subjects. The IL-4 activities of peripheral T-cells were analyzed by T-cell supernatant (T-sup)-induced CD23 expression from tonsil B-cells. In bronchial asthmatics the serum IgE levels and histamine $PC_{20}$ in addition to the above parameters were also compared before and after IFN-$\gamma$ treatment. IFN-$\gamma$ was administered subcutaneously with a weekly dose of 30,000 IU per kilogram of body weight for 4 weeks. Results : The ${O_2}^-$ generations by peripheral PMNs in bronchial asthmatics were higher than normal subjects($8.23{\pm}0.94$ vs $5.00{\pm}0.68\;nmol/1{\times}10^6$ cells, P<0.05), and significantly decreased after IFN-$\gamma$ treatment compared to initial values($3.69{\pm}0.88$ vs $8.61{\pm}1.53\;nmol/1{\times}10^6$ cells, P<0.05). CD23 expression of peripheral B-cells in bronchial asthmatics was higher than normal subjects($47.47{\pm}2.96%$, vs $31.62{\pm}1.92%$, P<0.05), but showed no significant change after IFN-$\gamma$ treatment. The serum sCD23 levels in bronchial asthmatics were slightly higher than normal subjects($191.04{\pm}23.3\;U/ml$ vs $162.85{\pm}4.85\;U/ml$), and 11(64.7%) of 17 patients showed a decreasing pattern in their serum sCD23 levels after IFN-$\gamma$ treatment. However the means of serum sCD23 levels were not different before and after IFN-$\gamma$ treatment. The IL-4 activities of peripheral T-cells in bronchial asthmatics were slightly higher than normal subjects($22.48{\pm}6.81%$ vs $18.90{\pm}2.43%$), and slightly increased after IFN-$\gamma$ treatment($27.90{\pm}2.56%$). Nine(60%) of 15 patients showed a decreasing pattern in their serum IgE levels after IFN-$\gamma$ treatment. And the levels of serum IgE were significantly decreased after IFN-$\gamma$ treatment compared to initial values ($658.67{\pm}120.84\;IU/ml$ vs $1394.32{\pm}314.42\;IU/ml$, P<0.05). Ten(83.3%) of 12 patients showed an improving pattern in bronchial hyperresponsiveness after IFN-$\gamma$ treatment, and the means of histamine $PC_{20}$ were significantly increased after IFN-$\gamma$ treatment compared to initial values ($1.22{\pm}0.29mg/ml$ vs $0.69{\pm}0.17mg/ml$, P<0.05). Conclusion : Our results suggest that IFN-$\gamma$ may be useful as well as safety in the treatment of bronchial asthmatics with high serum IgE level and that in vivo effects of IFN-$\gamma$ may be different from its in vitro effects on the regulations of IgE synthesis or the respiratory burst of PMN.

• Archives of Pharmacal Research
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• v.23 no.6
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• pp.626-632
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• 2000

Brazilin, an active principle of Caesalprenia sappan, was examined for its immunopotentiating effects in multiple low dose streptozotocin (MLD-STZ) induced type diabetic mice. Brazilin was intraperitoneally administered for 5 consecutive days to MLD-STZ induced type 1 diabetic mice. Delayed type hypersensitivity, Con A-induced proliferation of splenocytes and mixed lymphocyte reaction, which had been decreased in diabetic mice, were significantly recovered by the administration of brazilin. Brazilin increased IL-2 production without affecting suppressor cell activity. Con A-induced and IL-2-induced expression of high affinity IL-2 receptors were also enhanced by brazilin. These results indicate that brazilin augments cellular immune responses, which are suppressed in the MLD-STZ induced type I diabetic mice, by increasing IL-2 production and responsiveness of immune cells to IL-2.

• The Journal of Korean Medicine Ophthalmology and Otolaryngology and Dermatology
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• v.23 no.3
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• pp.42-65
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• 2010

Objectives : Betula platyphylla var. japonica extract (BPE) was used to determine the modulation of cytokine secretion, the activation of inflammatory and allergic factor and the inhibition of gene expression. Inflammatory and allergic cytokines as IL-$1{\beta}$, IL-2, IL-4, IL-5, IL-6, IL-8, TNF-${\alpha}$, NO and COX-2 were measured to use effectively on improvement or treatment of atopic dermatitis. Methods : We used NC/Nga mouse induced by atopic dermatitis to observe the effects of BPE on the weight, water and feed, blood test, weight of organs, histological change, total IgE and histological change of main organs. Results : BPE is effective on anti-inflammatory and allergic reaction. However, further study is needed to prove which component of BPE indicates effective pharmacological action. Conclusions : The above results suggest that Phellinus igniarius Quel extract could be applicable for improvement of several skin functions.

• 대학교육
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• s.127
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• pp.23-32
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• 2004

모든 갈등의 해소는 사회윤리의 기본적인 작동원리에 의거하여 당파적.부분적 이익보다 더 큰 사회공동체의 이익을 우선적으로 도모하겠다는 구성원의 자기관리의식에 달려 있다.

• KLA journal
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• v.16 no.5
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• pp.17-23
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• 1975

본고는 1972년도 연세대학교 교육대학원 사서교육전공(제1회) 석사학위 논문의 요약이다.