• 한국가스학회지
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• 제16권2호
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• pp.52-59
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• 2012

본 연구에서는 화재로부터 가장 효과적인 소화설비로 평가받고 있는 스프링클러 시스템에 대해 화재 시뮬레이션과 수리계획법에 기반을 한 최적 배치방법을 제안하였다. 사례연구로, $5.2m(L){\times}5.4m(W){\times}2.4m(H)$ 크기의 일반 주거지 형태를 대상공간으로 설정하고, 부주의로 폴리우레탄 소재의 소파에 불이 인화되어 화재가 전이되는 시나리오를 구성하였다. 그리고 스프링클러의 종류와 개수에 따른 소화속도, 온도변화, 표면 열방출률을 시뮬레이션을 통해 분석하고, 공간 균등배분 방법으로 설치된 스프링클러의 설치비와 화재 피해액의 정형화를 바탕으로, 수리계획법을 이용하여 최적 소화성능의 스프링클러 배치시스템을 얻을 수 있었다.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2022년도 추계학술대회
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• pp.185-187
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• 2022

오늘날 4차 산업혁명 시대에서 교육 패러다임의 급격한 변화로 인공지능(이하 AI) 교육이 점점 더 강조되고 있다. 2022 개정 교육과정은 미래사회에서 필요한 기초소양과 역량을 함양할 수 있는 AI 교육을 제시하고 있다. 본 연구에서는 초·중등학교 AI 교육에서 컴퓨팅 사고력 및 수학적 사고력 향상을 위해 다음과 같이 제언하고자 한다. 첫째, 컴퓨팅 사고력 교육 측면에서 학생들이 AI 개념과 원리를 잘 이해하고 실생활의 문제해결을 위한 능력을 키울 수 있는 교수 원리 연구가 필요하다. 둘째, AI를 이해하기 위한 수학적 사고력 측면의 요소로서 학생들이 수식을 이용한 알고리즘과 컴퓨터가 인간처럼 사고하는 과정에서 이루어지는 학습원리를 습득할 수 있는 교육 프로그램이 요구된다. 향후 연구 과제로 교수자와 학습자의 관계에서 나올 수 있는 역량있는 학습 효과성 분석을 통한 기대치에 관한 연구에 대하여 제시하였다.

• 한국수학교육학회지시리즈B:순수및응용수학
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• 제19권4호
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• pp.409-421
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• 2012

In this paper, using an efficient change of variables we refine the Hyers-Ulam stability of the alternative Jensen functional equations of J. M. Rassias and M. J. Rassias and obtain much better bounds and remove some unnecessary conditions imposed in the previous result. Also, viewing the fundamentals of what our method works, we establish an abstract version of the result and consider the functional equations defined in restricted domains of a group and prove their stabilities.

• Korean Journal of Mathematics
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• 제19권2호
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• pp.129-147
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• 2011

In this paper we discuss the zeta-determinants of harmonic oscillators having general quadratic potentials defined on $\mathbb{R}^2$. By using change of variables we reduce the harmonic oscillators having general quadratic potentials to the standard harmonic oscillators and compute their spectra and eigenfunctions. We then discuss their zeta functions and zeta-determinants. In some special cases we compute the zeta-determinants of harmonic oscillators concretely by using the Riemann zeta function, Hurwitz zeta function and Gamma function.

• Kyungpook Mathematical Journal
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• 제56권4호
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• pp.1247-1257
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• 2016

In this paper, we discuss the crossing change operation along exchangeable double curves of a surface-knot diagram. We show that under certain condition, a finite sequence of Roseman moves preserves the property of those exchangeable double curves. As an application for this result, we also define a numerical invariant for a set of surface-knots called du-exchangeable set.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2003년도 춘계전력전자학술대회 논문집(1)
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• pp.97-101
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• 2003

In this paper, we propose a new diagnosis method of DC/UC converter aging. The method is based on parasitic resister change with aging process. we apply to on-line diagnosis of DC/DC converter because of observing not a device but a system. We present the mathematical analysis and experimental study.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2008년도 학술발표회 논문집
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• pp.26-32
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• 2008

Middle Route Project, the largest water conveyance system in China delivers the water of Changjiang River to North China. In order to create canal operation simulation system, mathematical models are established based on the analysis of hydraulics about steady flow, unsteady flow, and check gate. By simulating the canal operation behavior, we improved the check gate control algorithm and predicted the change process of water surface and flow profile which is very valuable to actual canal operation.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1988년도 한국자동제어학술회의논문집(국내학술편); 한국전력공사연수원, 서울; 21-22 Oct. 1988
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• pp.214-218
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• 1988

This paper suggests mathemathical engine model which can simulate generalized gasoline engine. Suggested engine model contains air/fuel inlet element, intake manifold, combustion, engine dynamics. In order to analyze a gasoline engine, physical characteristics of engine and steady state engine data should be controlled. In adaptation for abrupt change of circumstance or drive conditions, this model can analyze important physical phenomena in the intake manifold by computer simulation. This model can also evaluate statuses of drive under various working conditions precisely. Therfore, this model suggests basic datum to evaluate the engine system which are needed in designing and development of engine controller.

• Korean Journal of Mathematics
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• 제16권4호
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• pp.471-480
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• 2008

As students with low basic knowledge of mathematics increase, they have had difficulties in studying statistics theory class. By using recent students' characteristics which prefer seeing directly and checking to thinking logically, we try to change the teaching method into teaching in the computer lab(SAS program). We investigate whether changing the teaching method has effects on students' achievements and interests or not. The purpose of this study is to grope for a better teaching and develop mathematics education's satisfaction and qualification.

• KSBB Journal
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• 제5권4호
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• pp.377-382
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• 1990

The characteristics controlled drug release have been studied for biodegradable polymer matrix. Polymer matrix was prepared from glycerine, prednisolone and dextran. Mathematical analysis of the data showed that the release behavior actually conformed to the Higuchi's diffusion controlled model. The release time was increased as drug loading doses increased, whereas decreased as glycerine concentration increased. The release rate did not change by varying molecular weight of dextran.