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Inhibitory Activity of Medicinal Herbs on Nitric Oxide Synthesis in Activated Macrophages
Hwa Jin Lee,Ji Sun Kim,Changbae Jin,Jae-Ha Ryu 한국생약학회 2005 Natural Product Sciences Vol.11 No.1
nitric oxide synthase (NOS: cNOS and iNOS). The NO produced in large amounts by the iNOS is known to beresponsible for the vasodilation and hypotension observed in septic shock, cancer metastasis and inflammation.The inhibitors of iNOS, thus, may be useful candidates for the treatment of inflammatory diseases accompaniedby the overproduction of NO. We prepared alcoholic extracts of herbal drugs which have been used for thetreatment of inflammation in oriental medicine. We have screened the inhibitory activity of NO production inof herbal drugs, 35 extracts showed the potent inhibitory activity of NO production above 50% at theconcentration of 50 g/mL. The inhibitory activities of NO production were also evaluated for several solventfractions at two diferent concentrations. Especialy, hexane and EtOAc fractions of Alpinia officinarum, Angelicagigas, Ostericum koreanum, Saussurea lappa, Torilis japonica, and hexane fractions of Agrimonia pilosa,Machilus thunbergi, Hydrangea serata, Magnolia obovata, Prunela vulgaris, Tussilago farfara, and EtOACfractions of Perila frutescence showed a significant activity at 10 and/or 25 g/mL. In Western blot analysis, thehexane fractions (5 g/mL) of Magnolia obovata and Saussurea lappa, and EtOAc fractions (20 g/mL) ofHydrangea Serrata, Perilla frutescence and Torilis japonicaactivated macrophages. These plants may be promising candidates for the study of the activity-guided purificationof active compounds and might be useful for the treatment of inflammatory diseases and endotoxemiaaccompanying overproduction of NO.
A New Chromone, 11-Hydroxy-<i>sec</i>-<i>O</i>-glucosylhamaudol from <i>Ostericum koreanum</i>
Park, Yeo Jin,Kim, Hyoung Ja,Lee, Sook Ja,Choi, Ho-Young,Jin, Changbae,Lee, Yong Sup The Pharmaceutical Society of Japan 2007 Chemical & pharmaceutical bulletin Vol.55 No.7
<P>From the ethyl acetate fraction of the roots of <I>Ostericum koreanum</I>, a new chromone, 11-hydroxy-<I>sec</I>-<I>O</I>-glucosylhamaudol (1) along with the known compounds: four chromones, three coumarins, six phenolic compounds, and three quinic acids were isolated. These compounds were assessed for antioxidant activities in the DPPH radical and superoxide anion radical scavenging assay systems. Among isolates, 4-(2-hydroxy-vinyl)-benzene-1,2-diol (12) showed the most potent DPPH radical scavenging activity (IC<SUB>50</SUB>=4.80±0.62 μg/ml) and superoxide anion radical scavenging activity (IC<SUB>50</SUB>=11.05±0.83 μg/ml) in the xanthine/xanthine oxidase system. The antioxidant activities of 12 were comparable to those of quercetin and luteolin.</P>
Development of an autonomous outdoor patrol robot in private road environment
Jiyong Jin,Changbae Jung,Donghyeon Kim,Woojin Chung 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10
Recently, the necessity of an autonomous outdoor patrol robot is increasing. The outdoor navigation is more difficult than an indoor navigation because the outdoor environment is more complex than the indoor environment. Various methods[1-2] for the outdoor navigation were researched. However, it is not easy to implement these methods[1-2], since these solutions require expensive sensors. In this paper, we compute the robot’s pose by using Extended Kalman Filter[3], and extract the road information by using single Laser Range Finder(LRF). The localization, motion control, and the road information are used for a stable navigation. By using the proposed method, the autonomous outdoor patrol robot can navigate successfully in regular road environments.
전차량 모델링 및 하중변화가 고려된 ABS에 대한 연구
이재훈(Jaehoon Lee),이창배(Changbae Lee),국형석(Hyungseok Kook),박기홍(Kihong Park),허승진(Seung-Jin Heo) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
This paper uses a high degree automobile dynamic model to simulate better a real vehicle with an electronic control system based on Rapid-Control Prototyping (RCP). Using this model, this paper studies Anti-lock Brake System(ABS) to improve both braking and steering abilities. Current ABS uses consistent vertical force with a slip ratio, which is a difference between a vehicle's speed and a wheel's, from 0.1 to 0.3. However, because the maximum vertical force depends on a tire model's vertical force, the slip ratio was adjusted as vertical weight changes to improve ABS's performance.