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- 저자 : 이홍범 ( Hongbum Lee ) (검색결과 3 건)
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Hydraulic Clutch System의 Mission Profile 및 내구시험모수 결정에 관한 연구
이상천(Sangcheon Lee),허만대(Mandae Hur),이춘곤(Chungon Lee),김재영(Jaeyoung Kim),강지우(Jiwoo Kang),이홍범(Hongbum Lee),소윤섭(Yoonsub So),이종형(Jonghyung Lee),민병길(Byunggil Min),이재열(Jaeyul Lee) 대한기계학회 2009 大韓機械學會論文集A Vol.33 No.5
One of reliability measurements of vehicle is estimated by driving mileage but the reliability of component, such as an hydraulic clutch system, is defined from the number of successful operational cycle. Relationship between these reliability measurement variables(mileage and cycle) should be examined first of all in the reliability estimation of components. Relationship between mileage and cycles is commonly known as linear function. However, the gradient depends on the operational environmental condition. Therefore, estimation of mission profile variable should be done with correlation analysis at the same time. In this paper, we derive mission profile variable of an hydraulic clutch system by field vehicle test and suggest the determination process of durability test parameters of CMC(Clutch Master Cylinder) with mission profile variable.
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이명섭(Myungsub Lee),이재천(Jaecheon Lee),허만대(Mandea Hur),김재영(Jaeyoung Kim),이홍범(Hongbum Lee),소윤섭(YoonSub So) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
This study presents the design and manufacture of Vacuum Clutch Booster(NCS). Since engine torque tends to be increased, manual vehicle clutch load is growing. The objective of this study is to reduce clutch pedal load by using clutch vacuum booster. First, the principle of performance about Vacuum Booster was addressed to keep studying and analytic of booster and to get the parameter of booster’s improvement. Second modeling using MATLAB and calcuate a result. Third manufacture of NCS and then dynamic tests was carried. Compare dynamic test with MATLAB Simulation. In the middle part of the simulation was not able to get a good result because of vacuum ratio and Reaction DISC part(parameter K). As a result, A decrease of 3.62kgf pedal load compared with unused booster was achieved. Furthermore, The additional dynamic’s Modeling of Vacuum Booster program by MATLAB make up to for the clutch control part.
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오유나 ( Yoona Oh ),이홍범 ( Hongbum Lee ),김형우 ( Hyungwoo Kim ) 대한본초학회 2018 大韓本草學會誌 Vol.33 No.6
Objective : Many patients take antihypertensive drugs as well as herbal medicines at the same time in order to treat other symptoms or to keep their well-being. In this study, interactions between herbal medicines and synthetic antihypertensive drugs were analyzed. Methods : To investigate the interaction between herbal medicines and synthetic antihypertensive drugs, three electronic databases, including OASIS, Mediline and Sciencedirect were searched. Experimental and clinical studies on the interaction between herbal medicines and antihypertensive drugs were independently reviewed and included. Results : Analyzing selected studies, twenty herbs were found to interact with antihypertensive drugs. Herbs found to increase the antihypertensive effect were Panax ginseng, Carthamus tinctorius, Magnolia officinalis, Silybum marianum, Scutellaria baicalensis, Schisandra chinensis, Sophora flavescens, Piper nigrum, Curcuma longa, Ginkgo biloba, Juncus effuses and Hydrastis canadensis . In contrast, Commiphora myrrha, Rhodiola rosea, Hypericum perforatum, Eurycoma longifolia, and Daturae metel were found to inhibit the antihypertensive effect. Stephania tetrandra could increase or decrease the effect depending on the type of antihypertensive drug. Epedria sínica was suspected of pharmacodynamic interaction with antihypertensive drug. Glycyrrhiza uralensis has been reported to have serious side effects in combination with antihypertensive drugs. Conclusion : These results imply that when used in combination with herbal medicines and synthetic antihypertensive drugs, proper doses and herbs which are to avoid need to be informed to the patients. Despite concerns about interactions between herbal medicines and synthetic drugs, related research is very limited. More systematic researches are needed to give information on patient safety as well as to guide clinical practice.
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