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Expansiveness on invertible iterated Function Systems
구세현,구민희,주항연 충청수학회 2019 충청수학회지 Vol.32 No.4
'In this article, we study the dynamics of invertible iterated function systems on compact spaces. We prove the equivalences for the notions of expansiveness on invertible iterated function systems.
시호 물 추출물의 마우스 골수세포를 이용한 유전독성 평가
전우현,정인권,강수진,구세광,이영준 한국한의학연구원 2012 한국한의학연구원논문집 Vol.18 No.2
In this research, the genotoxic effect of Bupleuri Radix (BR), the dried roots of Bupleurum falcatum Linne has been traditionally used as anti-inflammatory agent, was evaluated using the mouse micronucleus test. BR aqueous extract (yield = 16.52%) was administered once a day for 2 continuous days by oral gavage to male ICR mice at doses of 2,000, 1,000 and 500 mg/kg. Cyclophosphamide (CPA) 70 mg/kg was used as a known genotoxic agent in a positive control. The appearance of a micronucleus (MN) in polychromatic erythrocyte (PCE) is used as an index for genotoxic potential, and PCE ratio is used as an index of cytotoxicity. Although significant (p<0.01) increase of the number of PCE with one or more nuclei (MNPCE) was detected in CPA treated groups, no significant increases of MNPCE numbers were observed in all three different dosages of BR extracts treated mice with over 0.30 of the individual polychromatic erythrocyte ratio in all mice used in this study. The results obtained indicated that BR extract shows no genotoxicity effects up to 2,000 mg/kg dosing levels the limit dosage in rodents.
Allium victorialis Leaf Extract Prevents High Fat Diet Induced Obesity in Mice
구세광,정인권,전우현,김주완 한국임상수의학회 2011 한국임상수의학회지 Vol.28 No.3
The antiobese effects of Allium victorialis (AV) leaf methanol extract were evaluated in a high fat diet (HFD) supplied mice. The changes on the body weight, food consumption, leptin and adiponectin levels as well as the periovarian fat weights and histopathology of adipocytes were examined. The effects were compared with those of a group given 250 mg/kg of metformin. After 91 days of a continuous HFD supply, the mice were significantly showed obesity. However, the obesity induced by the HFD was inhibited by the AV extract treatment at the three different doses (62.5, 125 and 250 mg/kg) respectively. The results suggest that the AV methanol extract is beneficial for improving the diet-induced obesity in humans.
Micronucleus Test of Picrorrhiza Rhizoma Aqueous Extract in Bone Marrow Cells of Male ICR Mice
정인권,전우현,구세광 한국독성학회 2011 Toxicological Research Vol.27 No.2
In this research, the genotoxic effect of Picrorrhiza Rhizoma (PR) aqueous extract was evaluated using the mouse micronucleus test. PR extract was administered once a day for 2 continuous days by oral gavage to male ICR mice at doses of 2000, 1000 and 500 mg/kg. Cyclophosphamide was used as a known genotoxic agent in a positive control. The appearance of a micronucleus (MN) in polychromatic erythrocyte (PCE) is used as an index for genotoxic potential, and PCE ratio is used as an index of cytotoxicity. Although significant (p < 0.01) increase of the number of PCE with one or more nuclei (MNPCE) was detected in cyclophosphamide treated groups, no significant increases of MNPCE numbers were observed in all three different dosages of PR extracts treated mice with over 0.39 of the individual polychromatic erythrocyte ratio in all mice used in this study. The results obtained indicated that PR extract shows no genotoxicity effects up to 2000 mg/kg dosing levels.
피질하 혈관성치매의 진단, 치료 및 예방 : 1례 보고와 함께
최성훈,구세광,전우현,백경민,한창현,전원경,이영준,Choi, Seong-Hun,Ku, Sae-Kwang,Cheon, Woo-Hyun,Baek, Kyung-Min,Han, Chang-Hyun,Kyung, Jeon-Won,Lee, Young-Joon 대한예방한의학회 2010 대한예방한의학회지 Vol.14 No.3
Vascular dementia(VaD) is currently considered to be the second most common type of dementia. VaD is not a single diagnostic entity, but a heterogeneous syndrome which encompasses several clinicopathological forms of dementia resulting from cerebrovascular diseases. A common form of VaD is subcortical VaD which is characterized by lacunar infarcts and deep white matter changes, leading to a progressive decline in memory and cognitive function. The neuropsychological and cognitive profiles of subcortical VaD have been reported relatively homogeneous. At present, subcortical vascular dementia is regarded as the most important subtype of VaD with getting the attention of vascular dementia. The aims of this study are to discuss the concept of subcortical VaD and its importance focusing on diagnosis, prevention and treatment with a case report.
Micronucleus Test of $Scutellariae$ $Radix$ Aqueous Extract in Bone Marrow Cells of Male ICR Mice
정인권,전우현,강수진,구세광,이영준,Chung, In-Kwon,Cheon, Woo-Hyun,Kang, Su-Jin,Ku, Sae-Kwang,Lee, Young-Joon Society of Preventive Korean Medicine 2012 대한예방한의학회지 Vol.16 No.1
Objectives : In this research, the genotoxic effect of $Scutellariae$ $Radix$(SR), the dried roots of $Scutellaria$ $baicalensis$ Georgi has been traditionally used as antipyretic agent, was evaluated using the mouse micronucleus test. Methods : SR aqueous extract(yield = 27.2%) was administered once a day for 2 continuous days by oral gavage to male ICR mice at doses of 2,000, 1,000 and 500 mg/kg. Cyclophosphamide(CPA) 70 mg/kg was used as a known genotoxic agent in a positive control. The appearance of a micronucleus(MN) in polychromatic erythrocyte(PCE) is used as an index for genotoxic potential, and PCE ratio is used as an index of cytotoxicity. Results and Conclusions : Although significant(p<0.01) increase of the number of PCE with one or more nuclei(MNPCE) was detected in CPA treated groups, no significant increases of MNPCE numbers were observed in all three different dosages of SR extracts treated mice with over 0.33 of the individual polychromatic erythrocyte ratio in all mice used in this study. The results obtained indicated that SR extract shows no genotoxicity effects up to 2,000 mg/kg dosing levels - the limit dosage in rodents.
SHADOWING PROPERTY ON MULTI-VALUED DYNAMICAL SYSTEMS
주항연,구세현,박종서 충청수학회 2016 충청수학회지 Vol.29 No.1
In this article, we study various notions on multi-valued dynamical systems. We first investigate important tools to express the systems, and prove that the notion of chain recurrence is equivalent to the notion of nonwandering set on compact metric spaces.
A SHORT REMARK ON CONTROL SYSTEMS
주항연,구세현,Seung Ki Yoo 충청수학회 2016 충청수학회지 Vol.29 No.1
Souza and Tozatti~\cite{So-To-2013} introduce the notions of prolongations and prolongational limit sets on control systems. In this article, we prove the upper semicontinuity of first positive prolongations and first positive prolongational limit sets on control systems.
CHARACTERIZATIONS ON CHAIN RECURRENCES
박종서,구세현 대한수학회 2010 대한수학회보 Vol.47 No.2
It is well known that there is a residual subset J of the space of C1-diffeomorphisms on a compact Riemannian manifold M such that the maps f → chain recurrent set of f and f → number of chain components of f are continuous on J. In this paper we get the flow version of the above results on diffeomorphisms.
Idempotent functions on topological dynamics
주항연,김민영,구세현,박종서 충청수학회 2018 충청수학회지 Vol.31 No.1
In this article, we deal with notion of idempotent in dynamical systems and prove that both closure function and orbital function are idempotent functions on the systems.