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허민,Heo, Min 한국수학사학회 1998 Journal for history of mathematics Vol.11 No.1
It is said that we are teaching mathematics because it is useful, beautiful and culturally valuable and also strengthens the mind. In the paper we consider the role of history of mathematics in accomplishing these purposes.
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허민,Heo, Min 한국수학사학회 2001 Journal for history of mathematics Vol.14 No.1
In this paper we collect applications of secondary school mathematics which can be used in classroom instruction. With these applications we can also show the utility of mathematics.
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태아 심장판막 및 폐 , 대동맥에서의 최대혈류속도의 변화
허민,김동호,서정호 대한산부인과학회 1990 Obstetrics & Gynecology Science Vol.33 No.8
1989년 1월부터 1990년 1월말까지 중앙대학교 의과대학 부속병원 산부인과에 내원한 임부 134명을 대상으로 Doppler 심 초음파를 이용하여 태아의 폐동맥, 대동맥 및 삼첨판, 승모판에서의 최대혈류속도를 비교분석하여 다음과 같은 결론을 얻었다. 1. 태아 폐동맥에서 최대 혈류속도는 임신 31주 이전에는 68.6±9.4cm/sec, 임신 31주 이후에는 70.7±9.7cm/sec로서 두군간에 유의한 증가는 없었다. 2. 태아 대동맥 최대 혈류속도는 임신 31주이전에는 65.0±8.3cm/sec, 임신 31주이후에는 70.0±8.8cm/sec로서 재태기간이 진행됨에 따라 유의한 증가를 보였다(p$lt;0.05). 3. 태아 삼첨판의 최대 혈류속도는 임신 31주이전에는 50.5±6.9cm/sec, 임신 31주 이후에는 52.9±7.7cm/sec로서 유의한 차이는 없었다. 4. 태아 승모판에서 최대혈류속도는 임신 31주이전에는 48.5±7.2cm/sec, 임신 31주이후에는 51.1±9.0cm/sec로서 두군간에 유의한 증가는 없었다. Pulsed Doppler ultrasound technique were used to exame 134 fetuses between 17 and 42 week's gestation in order to compare pulmonany artery and aortic outflow maxmal velocities and tricuspid valve and mitral valve maximal flow velocities. For purposes of analysis, fetuses were devided into two groups: those less than 31 completed weeks and those of 31 completed weeks or more. This study demonstrates differences in fetal maximal flow velocities of pulmonary artery, aorta, mitral valve, tricuspid valve that must be considered in evaluating studies of fetal cardiac physiology. In conclusion, most maximal doppler flow velocities were not significantly different, but maximal doppler flow velocities were greater in aorta, those of 31 compleeted weeks or more than those less than 31 completed weeks,(P$lt;0.05).
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허민,김동호,장은진 대한산부인과학회 1991 Obstetrics & Gynecology Science Vol.34 No.5
중앙대학교부속 용산병원 산부인과에서는 1989년 8월부터 1990년 9월까지 만 14개월동안 자궁근종 환자 51예에서 골반경하 자궁근종절제술을 시행하였다. 빠른 회복기간, 통증의 감소, 경비의 절감, 수술후유착 감소 및 반복수술의 용이성, 미용상의 효과등 많은 장점을 갖고 있으며, 특히 자궁근종이 있는 불임환자나, 임신을 더 원하는 여성, 젊은 여성 등에서는 매우 효과적인 수술방법이 될 수 있음을 경험하였다. Many gynecological procedures can be achieved safely and effectively by pelviscopic surgery. Pelviscopic surgery has been reported to reduce costs and recovery time for patients undergoing a variety of procedures and to minimize tissue handling and bleeding. Pelviscopic myomectomy was performed on 51 patients of myoma uteri at the Department of Obstetrics and Gynecology, College of Medicine, Chung-Ang University from Aug. 1989 to Sep. 1990. The number of myoma was 21 in intramural type and 67 in subserosal type. Mean operative time was 57.5 minutes, the range from 20 minutes to 2 hours 30 minutes. For the future, pelviscopic surgery will be popular surgical method in gynecological diseases.
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허민,Her, Min 한국수학사학회 2020 Journal for history of mathematics Vol.33 No.4
In this paper, we classify the mathematical terms in Korean Standard Unabridged Dictionary into four groups; ① group 1 consists of the terms which coincide with the mathematical terms in the 2015 Editing Material, ② group 2 consists of the terms which are synonyms or old terms or inflection forms of the mathematical terms in the Editing Material, ③ group 3 consists of the terms which do not belong to group 1 or group 2, but relate to the elementary or secondary school mathematics, ④ group 4 consists of the terms which do not relate to the elementary or secondary school mathematics. And then we make a comparative study with the mathematical terms in the Editing Material. In this study, we find out the mathematical terms in the Editing Material, but not in Korean Standard Unabridged Dictionary. And by using synonyms and old terms of the mathematical terms in the Editing Material we guess the rough tendency which terms belong to the Editing Material. By investigating the terms in group 3 and 4, we find out the mathematical terms which may belong to the Editing Material. We also find out the wrong or inconsistent explanations in Korean Standard Unabridged Dictionary.
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허민,고재준,김충혁,Heo, Min,Ko, Jae-jun,Kim, Chung-hyeok 한국전기전자재료학회 2016 전기전자재료학회논문지 Vol.29 No.11
It is highly important issue to use an energy efficiently for sustainable prosperity of mankind. From this point of view, using LED lighting can be a good alternative because it has a lot of advantages such as high efficiency, long life time and eco-friendly manufacturing process. That is the reason why using LED lighting has been encouraged worldwide. However, in situations that LED lighting is replacing traditional lighting quickly, the problem of the flicker of LED lighting has emerged as an important issue. Therefore, in foreign countries like US or Japan in order to ensure the reliability of LED lighting, study for flickering effects of the human body and test methods are have been actively conducted. But related research in domestic situation is an insufficient condition. In this study, a flicker characteristic was measured conventional lamps such as incandescent lamps or fluorescent lamp and 81 items of LED lightings which are distributed in domestic markets.
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A Study on Catalyst Layer Optimization for Anion Exchange Membrane Fuel Cell
허민,김성준,성영은 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Compared with proton exchange membrane fuel cells, anion exchange membrane fuel cells have a lot of research in order to reduce the price of expensive platinum catalysts because the reaction occurs under alkaline conditions and the activity of oxygen reduction is high. However, because of the phenomenon that water is produced in the anode and water is consumed in the cathode, effective water management is very important in increasing performance. Water management efficiency and electrochemical performance will vary greatly depending on the thickness and composition of the catalyst bed. In this study, the optimized catalyst layer structure was analyzed by changing the catalyst of the anode and cathode by using the commercial membrane anion exchange membrane of FuMATech.
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허민,Her Min 한국수학사학회 2005 Journal for history of mathematics Vol.18 No.3
We briefly survey the history of Chinese mathematics which concerns the resolution of right triangles. And we analyse the problems Yucigugosulyodohae(劉氏勾股述要圖解) which is the mathematical book of Chosun Dynasty and contains the 224 problems about right triangles only. Among them, 210 problems are for resolution of right triangles. We also present the methods for generating the Pythagorean triples and constructing polynomial equations in Yucigugosulyodohae which are needed for resolving right triangles. 이 글에서는 중국의 산학서에 나타난 직각 삼각형의 풀이에 관한 연구 결과를 역사적으로 간략히 알아본다. 그리고 직각 삼각형에 관한 문제만을 다룬 조선의 산학서 [유씨구고술요도해]를 중심으로 직각 삼각형의 풀이에 관한 문항들을 분석하고, 문제 풀이를 위한 다항 방정식 작성 방법을 예시하며, 각 문항에서 이용한 피타고라스 삼조들을 조사한다.
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