• Journal of Astronomy and Space Sciences
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• 제39권4호
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• pp.127-139
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• 2022

Irregular mare patches (IMPs), recently discovered on the Moon, are eruptions of magma on the lunar surface, and their origins are still in question. While prior studies on IMPs have mainly focused on optical image analysis, in this study, an analysis of the characteristics of minerals is performed exemplary for the first time. Modified Gaussian model (MGM) deconvolution was applied to the infrared spectrum to confirm the properties of the mafic mineral. Mafic minerals were analyzed for 6 olivine-rich (Ol-rich) IMPs out of 91 currently reported, and only 4 of them yielded results of significance. All four sites showed more abundance of Fe than Mg, and manifested a weak relationship with Mg-suite rock. However, a problem was discovered during the MGM application process due to pilot implementation. In order to solve this problem, it is required to adjust the MGM initial condition settings more precisely and to increase the signal to noise ratio of the observation data. Moreover, it is necessary to analyze the mineral properties for all IMPs considering minerals other than Ol and utilize them to deduce the origin of the IMPs.

• 충청수학회지
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• 제28권3호
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• pp.397-408
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• 2015

In this paper, we solve the Hyers-Ulam stability problem for the following cubic type functional equation $$f(rx+sy)+f(rx-sy)=rs^2f(x+y)+rs^2f(x-y)+2r(r^2-s^2)f(x)$$in quasi-Banach space and non-Archimedean space, where $r={\neq}{\pm}1,0$ and s are real numbers.

• 대한수학회보
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• 제23권2호
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• pp.141-148
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• 1986

In [1], M. Guignard considered a constraint set in a Banach space, which is similar to that in [2] and gave a first order necessary optimality condition which generalized the Kuhn-Tucker conditions [3]. Sufficiency is proved for objective functions which is either pseudoconcave [5] or quasi-concave [6] where the constraint sets are taken pseudoconvex. In this note, we consider a psedoconvex programming problem in a Hilbert space. Constraint set in a Hillbert space being pseudoconvex and the objective function is restrained by an operator equation. Then we use the methods similar to that in [1] and [6] to obtain a necessary and sufficient optimality condition.

• 대한수학회지
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• 제36권6호
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• pp.1145-1168
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• 1999

The purpose of this paper is to study the complete submanifolds with restricted space-like and time-like holomorphic bisectional curvatures in an indefinite locally symmetric K hler manifold.

• 대한수학회지
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• 제38권1호
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• pp.135-146
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• 2001

Let M(sup)n be a space-ike submanifold in a de Sitter space M(sub)p(sup)n+p (c) with constant scalar curvature. We firstly extend Cheng-Yau's Technique to higher codimensional cases. Then we study the rigidity problem for M(sup)n with parallel normalized mean curvature vector field.

• 충청수학회지
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• 제21권1호
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• pp.29-48
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• 2008

We deal with the classification problem of real hypersurfaces in a complex hyperbolic space. In order to classify real hypersurfaces in a complex hyperbolic space we characterize a real hypersurface M in $H_n(\mathbb{C})$ whose structure vector field is not principal. We also construct extrinsically homogeneous real hypersurfaces with four distinct curvatures and their structure vector fields are not principal.

• 컴퓨터교육학회논문지
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• 제14권6호
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• pp.41-51
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• 2011

정보기술이 발전함에 따라 정보교육은 정보과학의 원리와 개념을 효과적으로 가르치기 위한 교육과정으로 개정되었다. 개정된 교육과정에 따라, 프로그래밍 언어를 활용한 알고리즘 사고 학습 및 문제해결능력 향상의 효과를 검증하는 연구들이 진행되고 있다. 그러나 학습자의 수준과 능력을 고려한 프로그래밍 교육에 대한 연구는 부족한 편이다. 따라서 본 연구는 대학교 3학년을 대상으로 학습자의 문제해결과정 각 단계가 프로젝트 완성도에 미치는 영향을 분석하였다. 문제해결 수준에 따른 프로젝트 완성도의 차이를 분석한 결과, 문제해결 수준이 높은 집단이 낮은 집단보다 프로젝트 완성도가 높은 것으로 나타났다. 문제해결과정 각 단계가 프로젝트 완성도에 미치는 영향을 분석한 결과, 문제발견 요인이 프로젝트 완성도에 유의미한 영향을 미치는 것으로 나타났다. 본 연구는 학습자의 프로젝트 완성도에 영향을 미치는 문제해결과정 단계를 탐색하여, 문제를 발견하는 활동과 반성적 성찰을 통한 문제해결 검토 과정이 중요함을 제안하였다.

• 한국과학교육학회지
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• 제14권1호
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• pp.85-102
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• 1994

The purpose of this study was to analyze students' physics problem solving processes and to find the patterns of their problem spaces when high school and university students solved the physics problems. A total of 51 students in a high school and in two universities participated in this study. Their thinking processes in solving 5 physics problems on electric circuit were recorded by using 'thinking aloud' method and were transferal into protocols. 'The protocols were analyzed by the coding system of problem solving process. One of the major theoretical contributions of the computer simulation approach to problem solving is the idea of problem space. Such a concept of problem space was applied to physics problems on electric circuit in this study, and students' protocols were analyzed by the basic problem spaces which were made up from the item analysis by the researcher. The results are as follows: 1) On the average 4.0 test items among 5 ones were solved successfully by all subjects, and all of the items were solved correctly by only 19 persons among all of them. 2) In regard to the general steps of problem solving process, there was little difference for each item between the good solvers and the poor ones. But according to the degree of difficulty of task there was a good deal of difference. For a complex problem all of 4 steps were used by most of students, but for a simple one only 3 steps except evaluating step were used by most of them. 3) It was found in this study that most of students used mainly the microscopic approach, that is, a method of applying Ohm's law on electric circuit simply and immediately, not using the properties of electric circuits. And also it was observed that most of students used the soloing tom below, that is, a solving path in which they were the first to calculate physical Quantities of circuit elements, before they caught hold of the meaning of the given problem regardless of the degree of difficulty.

• 한국실내디자인학회논문집
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• 제20권6호
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• pp.321-330
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• 2011

The purpose of this study is to propose how the interior of the child psychiatric therapy Environment should be designed according to different problems that children have. For the purpose, this research has been conducted with a literature review and an empirical survey. The subjects of the survey were 100 children, 58 male and 42 female, who were using child psychiatric therapy centers located in Busan. Findings are as follows: (1) Children with behavior problem($C_b$) showed a significantly higher satistaction with the entrance and the information in a given child psychiatric therapy space than children with emotional problem ($C_e$) did. (2) Spatial attitude of $C_e$ and $C_b$ were significantly differed. (3) Colors that were being preferred by $C_e$ were cold colors, for example, blue and indigo. While, $C_b$ were preferring warm colors such as red and yellow. (4) There was difference in the image of a entrance and classrooms at the child psychiatric therapy center that children had in mind, the two groups of children were quite differently feeling about the size and noise of the therapy space.

• 한국항공우주학회지
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• 제35권5호
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• pp.412-418
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• 2007

본 논문에서는 충돌각 구속조건을 갖는 비행체 호밍 제어 유도법칙에 대한 역최적 문제를 제시한다. 편향비례항법 유도법칙의 이득과 LQ 문제에서의 가중치와의 관계를 규명하고, Riccati 방정식으로부터 제어입력이 LQ 최적제어가 되기 위한 영역을 제시한다. 이를 근거로 종말 구속조건을 만족하는 호밍 유도법칙의 제어이득이 최적제어법칙이 되기 위한 범위를 제안한다. 이론적 해석 결과의 타당성은 3-DOF 모의시험을 통하여 확인한다.