• 한국수학교육학회지시리즈A:수학교육
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• 제38권2호
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• pp.189-197
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• 1999

Discrete mathematics allows students to examine and explore unique, special problem situations which were not used to solve problems by paper-and-pencil procedures or applying common formulas. The use and integration of accessible computer-related technologies such as 'Mathematics' or 'Maple' software programs enables students to explore problem situation dramatically. This study shows that it is possible to introduce computer-based discrete mathematics focused on the Leslie matrix model as modeling age-specific population growth to high school students.

• 대한수학회지
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• 제55권3호
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• pp.705-717
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• 2018

We construct some infinite series of free and nearly free curves using pencils of conics with a base locus of cardinality at most two. These curves have an interesting topology, e.g. a high degree Alexander polynomial that can be explicitly determined, a Milnor fiber homotopy equivalent to a bouquet of circles, or an irreducible translated component in the characteristic variety of their complement. Monodromy eigenspaces in the first cohomology group of the corresponding Milnor fibers are also described in terms of explicit differential forms.

• 한국항해학회지
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• 제22권1호
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• pp.15-22
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• 1998

In this paper, discontinuity parts in microstrip line with $\lambda$/4 open stub and one in crank type have been anlayzed by using FDTD(Finite-Difference Time-Domain) analysis method. The noise components, in this case, are occred at the discontinuites of the given microstrip lines, the complex poles were extracted by the analysis using GPOF (Generalized Pencil-of Function) method from electric field of time domain. It has, then, been found that the noise level and the noise frequency components included in signal could be derived.

• 한국멀티미디어학회:학술대회논문집
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• 한국멀티미디어학회 1998년도 추계학술발표논문집
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• pp.37-41
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• 1998

정보사회의 주 도구인 컴퓨터에서 한글처리의 불완전함으로 인하여 한국인의 사고 체계는 부분적으로 제약을 받고 있다. 이것은 지적 노동 생산성을 저해할 뿐만 아니라 컴퓨터로 표현할 수 없는 글자는 장기적으로 사용이 뜸해져서 결국 사라지게 될 수도 있다. 본 논문은 컴퓨터가 한국인의 사고력을 높여주고 지적 노동 생산성을 극대화할 도구가 될 수 있도록 마치 연필로 글을 쓸 때처럼 자유스럽게 글자를 임의로 조합할 수 있게 하는데 역점을 가지고, 이를 위하여 훈민정음 원리를 적용하여 천지자연의 글자를 표현한다는 원리를 구현함으로써 연필 컴퓨터에 관한 한 가지 구현을 하였다.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 2001년도 춘계학술대회 논문집(한국공작기계학회)
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• pp.393-398
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• 2001

This paper aims to work process of connecting rod die using CAD/CAM/CNC systems. CAD/CAM/CNC systems are consist of CAD(MDT4.0), CAM(Z-MASTER) software and CNC milling machine. CAM software is purpose to G-code generation for CNC programming. Then CAM software and CNC milling machine are connect to RS-232-C cable for data network.

• 충청수학회지
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• 제12권1호
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• pp.147-155
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• 1999

Let {$C_t$} be a pencil of smooth quartics for $t{\neq}0$ degenerating to a plane quartic $C_0$ with an ordinary cusp of multiplicity 3. We compute the stable limit as $t{\rightarrow}0$ of {$C_t$} when the total surface of this family has a triple point at the singular point of $C_0$.

• 한국의학물리학회:학술대회논문집
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• 한국의학물리학회 1999년도 Japanese Journal of Medical Physics
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• pp.220-221
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• 1999

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 1999년도 추계학술대회 논문집 - 한국공작기계학회
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• pp.269-274
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• 1999

This paper aims to DNC application of car fuel tank die working. DNC system is consist of CAD, CAM software and CNC milling machine. CAM software is purpose to G-code generation for CNC programming. Then CAM software and CNC milling machine are connect to RS-232-C cable for networking.

• 한국수학교육학회지시리즈A:수학교육
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• 제39권1호
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• pp.49-58
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• 2000

The purpose of this study is to investigate how to teach algorithms in mathematics class. Until recently, traditional school mathematics was primarily treated as drill and practice or memorizing of algorithmic skills. In an attempt to shift the focus and energies of mathematics teachers toward problem solving, conceptual understanding and the development of number sense, the recent reform recommendations do-emphasize algorithmic skills, in particular, paper-pencil algorithms. But the development of algorithmic thinking provides the foundation for student's mathematical power and confidence in their ability to do mathematics. Hence, for learning algorithms meaningfully, they should be taught with problem solving and conceptual understanding.

• 공업화학
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• 제17권2호
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• pp.170-176
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• 2006

자동차의 유리를 폴리카보네이트로 대체하기 위하여 폴리카보네이트 판 위에 하드 코팅을 시도하였다. 본 연구에서는 (3-glycidoxypropyl)trimethoxysilane (GPTMS), (3-aminopropyl)triethoxysilane (APS), diethylenetriamine (DETA)으로 부터 졸-겔 과정을 이용하여 코팅을 형성하였는데 이 때 가장 우수한 물성을 갖는 조건들을 찾아보았다. GPTMS와 DETA를 사용하였을 때는 연필 경도 2H의 표면이 매우 고른 코팅을 형성할 수 있었으며 GPTMS와 APS를 사용하였을 때에도 역시 연필 경도 2H의 고른 면을 갖는 코팅을 형성할 수 있었다. 그리고 GPTMS와 DETA를 이용하여 형성한 코팅이 매우 우수한 내마모성을 나타내었다.