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조선(朝鮮) 산학자(算學者) 홍정하(洪正夏)의 계보(系譜)
김창일,홍성사,홍영희,Kim, Chang-Il,Hong, Sung-Sa,Hong, Young-Hee 한국수학사학회 2010 Journal for history of mathematics Vol.23 No.3
조선의 가장 위대한 산학자 홍정하(洪正夏)의 수학적 계보와 가계를 조사하여 중인 산원들의 관계를 조사한다. 중인으로 산서를 저술한 산학자 경선징(慶善徵), 이상혁(李尙爀)과 홍정하(洪正夏)는 결혼에 의하여 연결되어 그들의 수학적 업적이 연결될 수 있었음을 보이고, 또 홍정하(洪正夏)의 가계와 인척으로 연결된 중인 산원들의 가계를 밝혀내어 홍정하(洪正夏)의 업적이 중인 산원들에 큰 영향을 끼친 것을 보인다. Hong Jung Ha(洪正夏, 1684~?) is the greatest mathematician in Chosun dynasty and wrote a mathematics book Gu Il Jib(九一集) which excels in the area of theory of equations including Gou Gu Shu. The purpose of this paper is to find his influence on the history of Chosun mathematics. He belongs to ChungIn(中人) class and works only in HoJo(戶曹) and hence his contact to other mathematicians is limited. Investigating his colleagues and kinship relations including the affinity and consanguinity, we conclude that he gave a great influence to those people and find that three great ChungIn mathematicans Gyung Sun Jing(慶善徵, 1684~?), Hong Jung Ha and Lee Sang Hyuk(李尙爀, 1810~?) are all related through marriage.
BCl₃/Cl₂/Ar 플라즈마에서의 Na<SUB>0.5</SUB>K<SUB>0.5</SUB>NbO₃ 박막의 표면반응
김동표(Dong-Pyo Kim),엄두승(Doo-Seung Um),김관하(Gwan-Ha Kim),우종창(Jong-Chang Woo),김창일(Chang-Il Kim) 한국표면공학회 2008 한국표면공학회지 Vol.41 No.6
The etch of (Na0.5K0.5)NbO₃ (NKN) thin film was performed in BCl₃/Cl₂/Ar inductively coupled plasma. It was found that the 1sccm addition BCl3 (5%) into Cl2/Ar plasma caused a non-monotonic behavior of the NKN etch rate. The maximum etch rate of NKN was 95.3 ㎚/min at BCl₃ (1 sccm)/Cl₂ (16 sccm)/Ar (4 sccm), 800 W ICP power, 1 Pa pressure and 400 W bias power. The NKN etch rate shows a monotonic behavior a s the bias power increases. The analysis of the narrow scan spectra o f XPS for both a s-deposited and etched NKN films allowed one to assume ion assisted etch mechanism. The most probable reason for the maximum etch rate can be defined as a concurrence of chemical and physical etch pathways.
압전 캔틸레버 구조를 이용한 도로용 에너지 하베스터의 개발 및 평가
김창일,김경범,전종학,정영훈,조정호,백종후,강인석,이무용,최범진,조영봉,박신서,남산,이영진,Kim, Chang-Il,Kim, Kyung-Bum,Jeon, Jong-Hac,Jeong, Young-Hun,Cho, Jeong-Ho,Paik, Jong-Hoo,Kang, In-Seok,Lee, Moo-Yong,Choi, Beom-Jin,Cho, Young-Bong 한국전기전자재료학회 2012 전기전자재료학회논문지 Vol.25 No.7
A road energy harvester was designed and fabricated to convert mechanical energy from the vehicle load to electrical energy. The road energy harvester is composed of 24 piezoelectric cantilevers and a vehicle load transfer mechanism. Applying a vehicle load transfer mechanism rather than directly installing energy harvesters under roads decreases the area of road construction and allows more energy harvesters to be installed on the side of the road. The power generation amount with respect to the vehicular velocity change was assessed by installing the vehicle load transfer mechanism and the energy harvester in the form of speed bumps and underground. The energy harvester installed in a speed bump form generated power of 7.61 mW at the vehicular velocity of 20 km/h. Also, power generation of the energy harvester installed in the underground form was 63.9 mW at the vehicular velocity of 28 km/h. Although the number of piezoelectric cantilevers was reduced by 1/3 to 24 in comparison to the previous research results with 72 piezoelectric cantilevers, similar power generation characteristic value was obtained within the vehicular velocity of 20 km/h by altering the vehicle load transfer mechanism and cantilever vibration method.
수학과 교과교실의 효율적인 환경 구성과 운영을 위한 방향 탐색
김창일,이봉주,Kim, Chang Il,Lee, Bong Ju 한국수학사학회 2013 Journal for history of mathematics Vol.26 No.1
이 연구는 교과교실제의 안정적인 정착을 위하여 수학과 교과교실을 효율적으로 구성하고 운영하기 위한 방향을 탐색하는 것을 목적으로 한다. 이를 위하여 교과교실제를 운영하는 10개의 시범학교에서 수학교실을 경험한 수학교사를 대상으로 면담을 실시하였다. 면담 결과, 수학교사는 수학과의 특성, 교수 학습 방법, 학교와 학생의 상황 등을 충분히 반영하여 수학과 교과교실 환경의 구성에 대한 계획을 수립하고, 교과교실 환경 구성의 의사결정 과정부터 적극 참여해야 하는 것으로 나타났다. 그리고 수학과 교과교실을 효율적으로 운영하기 위해서는 교과교실을 최대로 활용할 수 있는 구체적인 교수 학습 방법에 대한 지속적인 개발과 연수가 필수적인 것으로 드러났다. The purposes of this article are to discuss how mathematics classroom in the departmentalized classroom system can be established for effective education, and describe current efforts within departmentalized mathematics classrooms toward achieving this goal. A departmentalized mathematics classroom would be most effective in improving education if implemented after comprehensive preplan for the specificity of the subject and characteristics of students depending on their grades and levels in their unique school environment. Continued investigation for effective communication of teaching and learning methods in a mathematics classroom will be a key component to set a departmentalized mathematics classroom up and to improve the quality of education.
Quasi-F 공간과 극소 Quasi-F cover의 역사적 배경
김창일,Kim, Chang-Il 한국수학사학회 2005 Journal for history of mathematics Vol.18 No.4
티코노프공간 X에 대하여 C(X)와 $C^*(X)$는 Riesz-공간이다 C(X)가 순서-코시완비일 필요충분한조건은 X가 quasi-F 공간이고, X가 컴팩트공간이며 QF(X)가 X의 극소 quasi-F cover일 때, C(X)의 순서-코시완비화와 C(QF(X))는 동형이다. 본 논문에서는 quasi-F 공간의 정의와 극소 quasi-F cover의 구성에 관한 동기 및 역사적 배경을 살펴본다. For a Tychonoff space X, C(X) is a Riesz-space. It is well known that C(X) is order-Cauchy complete if and only if X is a quasi~F space and that if X is a compact space and QF(X) is a minimal quasi-F cover of X, then the order- Cauchy completion of C(X) is isomorphic to C(QF(X)). In this paper, we investigate motivations and historical backgrounds of the definition for quasi-spaces and the construction for minimal quasi-F covers.