• The Journal of Special Children Education
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• v.21 no.1
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• pp.271-297
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• 2019

Purpose: The purpose of this study was to examine the effects of a multi-strategy intervention program on addition of multi-digits with regrouping for high school students with intellectual disabilities (ID) attending a special school. Method: The multi-strategy program consisted of various intervention strategies with consideration of diverse characteristics of students with ID. In this study, A-B design was used to investigate the effects of the program for three students with ID. Results & Conclusion: The results indicated that the multi-strategy program was effective for increasing the rate of correct responses on the (two-digit number) + (one-digit number) questions with regrouping among high school students with ID. Also the multi-strategy intervention program was partially effective for the additions of multi-digits with bigger place value among the students with ID. Based on the results of this study, implications for practice and suggestions were discussed in details.

• Communications of Mathematical Education
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• v.24 no.3
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• pp.543-562
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• 2010

The purpose of this thesis is to analyze the error happening in the process of solving the simultaneous inequality with two unknown qualities and to propose the correct teaching method. We first introduce a problem about the simultaneous inequality with two unknown qualities. And we will see the solution which a student offers. Finally we propose the correct teaching method by analyzing the error happening in the process of solving the simultaneous inequality with two unknown qualities. The cause of the error are a wrong conception which started with the process of solving the simultaneous equality with two unknown qualities and an insufficient curriculum in connection with the simultaneous inequality with two unknown qualities. Especially we can find out the problem that the students don't look the interrelation between two valuables when they solve the simultaneous inequality with two unknown qualities. Therefore we insist that we must teach students looking the interrelation between two valuables when they solve the simultaneous inequality with two unknown qualities.

• The Journal of the Acoustical Society of Korea
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• v.18 no.4
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• pp.71-77
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• 1999

Exact forward modeling of acoustic propagation is crucial in MFP such as inverse problems and various other acoustic applications. As acoustic propagation in shallow water environments become important, range dependent modeling has to be considered of which PE method is considered as one of the most accurate and relatively fast. In this paper higher order numerical rode employing the PE method is developed. To approximate the depth directional operator, Galerkin's method is used with partial collocation to lessen necessary calculations. Linearization of tile depth directional operator is achieved via expansion into a multiplication form of (equation omitted) approximation. To approximate the range directional equation, Crank-Nicolson's method is used. Final1y, numerical self stater is employed. Numerical tests are performed for various occan environment scenarios. The results of these tests are compared to exact solutions, OASES and RAM results.

• Journal of the Korean Institute of Telematics and Electronics D
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• v.36D no.12
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• pp.1-10
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• 1999

In this paper, we analyzed the radiation patterns of a monopole antenna mounted on the complex structures by using FDTD method associated with 3-D PML absorbing boundary condition. In order to validate the proposed FDTD code, the radiation patterns of monopole antenna mounted on cylinders and spheres were compared with the exact solutions of $Carter^{[1]}$ and $Harrington^{[2]}$. For all case considered, the predicted radiation pattern exhibited excellent agreement with exact solution. To be able to model the more complex structures, the proposed FDTD methods are combined with BRL-CAD. And this procedures is applied to predict the radiation patterns of a wire antenna attached to the top of a Blackhawk helicopter.

• The KIPS Transactions:PartD
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• v.12D no.1 s.97
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• pp.81-90
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• 2005

Given a model and a property, model checking determines whether the model satisfies the property. In case the model does not satisfy the property model checking gives a counterexample which explains where the violation occurs. Since counterexamples are useful for model debugging as well as model understanding, counterexample generation is one of the indispensable components in the model checking tool. This paper presents efficient counterexample generation techniques when a safety property is falsified. These techniques are used to solve Push Push games which consist of 50 games. As a result, all the games are solved with the proposed techniques. However, with the original NuSMV, 42 games are solved but 8 failed. In addition, we obtain $86{\%}$ time improvement and $62{\%}$ space improvement compared to the original NuSMV in solving the game.

• Journal of the Korean Institute of Intelligent Systems
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• v.8 no.5
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• pp.51-60
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• 1998

There have been several recent studies concerning the stability of fuzzy control system and the synthesis of stabilizing fuzzy controllers. This paper reports on a related study nf the TS (Takagi-Sugeno) fuzzy systems, and it is shown that the controller synthesis problems for the nonlinear systems described by the TS fuzzy model can be reduced to convex problems involving LMIs (linear matrix ineclualities). After classifying the TS fuzzy systems into three families based on how diverse their input matrices are, different controller synthesis procedure is given for each of these families. A numerical example is presented to illustrate the synthesis procedures developed in this paper.

• Journal of the Korean School Mathematics Society
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• v.25 no.1
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• pp.79-104
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• 2022

It is very important to help students learn by examining how well students solve math problems. Therefore, in this study, four methods(error analysis by problem type, schematization analysis, area graph analysis, and broken line graph analysis) were constructed to analyze how the connectivity between concepts of middle school functions affects the problem solving results. The students' learning situation was visually expressed to enable intuitive understanding. This analysis method makes it easy to understand the evaluation results of students. It can help students learn by understanding their learning situation. It will be useful in mathematics teaching and learning as it can help students to monitor their own problems and make a self-directed learning plan.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2005.05a
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• pp.1052-1058
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• 2005

연구개발 프로그램을 체계적으로 평가하려는 노력은 선진국의 경우 이미 상당히 정착된 단계에 이르고 있으며, 국내에서도 1999년부터 국가 연구개발 프로그램의 효율성 제고를 목적으로 국가과학기술위원회 조사${\cdot}$분석${\cdot}$평가를 실시하고 있다. 이러한 배경에는 정부 내에서 연구개발 프로그램이 다원화되고 다양화되고 있는 가운데 국가 전체적인 차원의 전략적 중요성은 계속 높아지고 있기 때문인 것으로 풀이된다. 따라서 본 연구에서는 일반적인 프로그램 평가 모형을 고찰하고, 특히 국가 연구개발 프로그램 특성을 고려하여 연구개발 성과(Performance), 프로세스(Process), 사람(People)의 체계적인 평가를 위한 개념적 모형으로서 ${\ulcorner}$연구개발 프로그램 행동-프로세스 모형${\lrcorner}$을 제시하고자 한다.

• Journal of the Korean Professional Engineers Association
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• v.31 no.1
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• pp.17-28
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• 1998

누설 검출기들 중에서 검출 감도가 가장 민감한 것은 '헬륨 양이온 질량 분석계 누설 검출기(줄인 이름, '헬륨 누설검출기')'이다. 이 글은 헬륨 누설 검출기의 주요 부분을 이루고 있는 질량 분석계의 측정 원리를 요약하여 소개한 것이다. 누설 검사의 항목들은 검사의 필요에 따라 대개 시험 물체에서 누설의 크기와 시험 방법을 바탕으로 하여 대규모 누설, 총량 누설, 소규모 누설 그리고 미세 누설 등으로 나뉘어지며, 미세 누설들은 누설 검출기의 최소 검출 가능 누출률이 $10^{-8}$ std ㎤ s$^{-1}$ 보다 작은 범위에 있는 것들로서, 그들의 누설 시험은 헬륨 누설 검출기를 써서 하게 된다. 따라서, 헬륨 누설 검출기의 심장은 바로 질량 분석계이며, 질량 분석계의 원리를 이해하는 것은 곧, 헬륨 누설 검출기를 다루는 기술의 바탕을 다지는 것이라고 말할 수 있을 것이다. 여기서는 헬륨 질량 분석계의 원리를 쉽게 풀이하고, 그런 검출기를 써서 누설검사를 하는 데 바탕이 될 모습들을 함께 요약한다.약한다.

• Korea journal of population studies
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• v.16 no.1
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• pp.59-68
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• 1993

본 연구는 1980년대 우리나라 출산력의 급격한 변동을 설명하기 위하여 1988년 한국보건사회 연구원에서 실시한 전국규모의 출산력 및 가족보건조사자료를 기초로 출산순위진도 측정방법에 의하여 출산력을 분석한 것이다. 본 연구 결과에서는 년도별 출산력과 출산순위분포, 출산순위별 진도율 등을 측정하였고, 그 결과를 요약하면 다음과 같다. 1980년 초에는 출산력이 2.8에서 1986년 이후에 대체수준이하인 1.8로 계속적인 하향추세를 보였다. 출산순위별 진도율에서는 둘째에서 세째아이로 진도한 비율이 1980년초에서 1986년사이에 약 71%가 감소하였고, 세째순위에서 네째순위로 33%가 감소하였다. 세째이상으로 진도한 비율의 감소율이 90%를 상회하고 이중 둘째에서 세째사이의 변동율이 50%를 나타내었다. 출산순위분포에서는 둘째아이에 64%가 집중되어 있으며 출산진도율은 결혼에서 첫째아이로 진도되는 확률이 90%, 첫째에서 둘째로 85%, 둘째에서 세째로는 18%가 나타냈다. 이러한 현상은 최근 한국부인의 82%가 둘째아이에서 단산하는 경향을 보이고 한자녀만 갖는 확률은 15%로 풀이되고 있다.