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허민,Heo, Min 한국수학사학회 1997 Journal for history of mathematics Vol.10 No.2
수학사를 연구하고 편집하는 여러 가지 방법론(Historiography of Mathematics)을 소개한다. 수학사를 역사주의 관점에서 연구하는 문화적 수학사와 현대 수학을 중심으로 고려하는 수학적 수학사 및 사회학적 방법으로 접근하는 사회적 수학사를 고찰한다. 그리고 마지막으로 수학사에 대한 최근의 다양한 접근 방법을 소개한다.
허민 광운대학교 기초과학연구소 1997 기초과학연구소논문집 Vol.26 No.-
Many agree that the teaching of mathematics at all levels can be enriched by historical reflection. But in the instructional process the understanding of the process of mathematical creation and of the long grappling with mathematical problems are almost completely lost. Mathematics is by nature a cumulative subject. Exposing students to some of these historical processes has a potential to enliven the subject and to humanize it for them. In this paper we seek to identify and clarify some techniques and pedagogical approaches for using the history of mathematics.
허민,김은희,송인경,이지현,김희수,김진태 대한마취통증의학회 2016 Anesthesia and pain medicine Vol.11 No.4
Background: This study was performed to investigate optimal central venous pressure (CVP) or pulmonary artery occlusion pressure (PAOP) transducer levels in supine and prone positions in pediatric patients. Methods: Chest tomography images of 213 children aged ≤ 10 years were reviewed. Distances from the back to the uppermost blood level of both atria and their ratios to the largest anteroposterior (AP) diameter of the thorax were calculated for the supine position. For the prone position, same distances and ratios were calculated from the anterior chest. Subgroup analysis was performed to evaluate if there were significant differences in each ratio according to age. Results: In the supine position, the ratio of the uppermost blood level of the right atrium (RA) and left atrium (LA) to the largest AP diameter of the thorax was 80–85% and 60–65%, respectively. The ratio of the most posterior blood level of the RA and LA to largest AP diameter of thorax was 45–50% and 55–60%, respectively, from the anterior chest in the prone position. Subgroup differences in each ratio were within the range of 5%. Conclusions: In pediatric patients, CVP and PAOP transducers should be differently placed according to supine and prone positions. The influence of age was minimal on the level of each transducer.
Estrogen이 혈관에 미치는 직접적인 효과의 증거로서 제대혈관 내피세포내 Estrogen 수용체에 대한 연구
허민,박형무,유재형,박용욱,강응택 대한산부인과학회 1994 Obstetrics & Gynecology Science Vol.37 No.2
본 논문은 1993년도 중앙문화연구원 학술연구비에 의하여 연구되었음. 본 논문의 요지는 1993년 대한폐경학회 제2차 학술대회에서 발표되었음. It has been reported that estrogens have a protective role on the cardiovascular system, that is, the reduction of the risk of cardiovascular disease which is the most common cause of death in women over 50 years of age in the industrialized countries. Postmenopausal estrogen replacement therapy reduces the risk of coronary heart disease by 30-70% and risk of stroke by 40%. The exact role of estrogens in the pathogenesis of atherosclerosis and myocardial in farction remains to be defined. This beneficial effect of hormone replacement therapy on the cardiovascular disease is mainly mediated by changes in lipid and lipoprotein metabolism such as decreased total and LDL-cholesterol and increased HDL-cholesterol, which reduce the atherogenesis.But other non-lipid mechanisms also appear to be involved. The current data prove that the vascular endothelium plays a prominent role in the regulation of vascular tone and reactivity by producing several potent locally acting vasoactive peptides. Estrogens have been reported to induce vasodilation in variety of animals. if estrogens are clearly associated with release o certain vasoactive peptides such as prostacyclin or endothelium-derived relaxing factor (EDFR), endothelium may have an another causative mechanism in addition to muscularis of the blood vessel wall for the expression of estrogen actions on the cardiovascular system. To prove this hypothesis, we carried out preliminary study about the status of the estrogen receptors in the vascular endothelium immunohistochemically by using the umbilical vein and endothelial cell culture. Weekly positive reaction of estrogen receptor is noted in the endothelial cells of umbilical veins and arteries in fresh umbilical specimen. intracytoplasmic and intranuclear positive reaction of estrogen receptor in clutured endothelial cells of umbilical vein were clearly identified. These findings suggest that vascular endothelium may be target tisues for estrogen and the effect of estrogens on vascular tissuse may be partially mediated through the actions on endothelium.
허민,이덕용 한국기계기술학회 2016 한국기계기술학회 학술대회논문집 Vol.2016 No.10
IThis study is for the safety display device to the transportation of the road that are installed on the boundary stone. This device includes an upper side that is located and fixed on the boundary stone top, and a side that is fixed on the boundary stone front. Solar cell convert light of solar to electric energy is equipped inside the upper side. the device’s side part is consisted 3 part. the charging unit for charging the electric energy generated from the solar cell to charge the battery, the illuminance sensing unit for detecting the night, and the LED unit for flashing traffic sign in night. furthermore this device can be installed easily on the boundary stone. and it can help driver to aware road and boundary stone by improving visibility in night time.