• Structural Engineering and Mechanics
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• 제64권6권
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• pp.695-701
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• 2017

This paper investigates some general properties in the degenerate scale problem of antiplane elasticity or Laplace equation. For a given configuration, the degenerate scale problem is solved by using conformal mapping technique, or by using the null field BIE (boundary integral equation) numerically. After solving the problem, we can define and evaluate the degenerate area which is defined by the area enclosed by the contour in the degenerate configuration. It is found that the degenerate area is an important parameter in the problem. After using the conformal mapping, the degenerate area can be easily evaluated. The degenerate area for many configurations, from triangle, quadrilles and N-gon configuration are evaluated numerically. Most properties studied can only be found by numerical computation. The investigated properties provide a deeper understanding for the degenerate scale problem.

• 한국수학교육학회지시리즈A:수학교육
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• 제43권3호
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• pp.275-289
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• 2004

The purpose of the study is to investigate how children and preservice teachers would make a progress in solving the open-problems related to area. In knowledge-based information age, information inquiry, information construction, and problem solving are required. At the level of elementary school mathematics, area is mainly focused on the shape of polygon such as square, rectangle. However, the shape which we need to figure out at some point would not be always polygon-shape. With this perspective, many open-problems are introduced to children as well as preservice teacher. Then their responses are analyzed in terms of their logical thinking and their understanding of area. In order to make students improve their critical thinking and problem solving ability in real situation, the use of open problems could be one of the valuable methods to apply.

• 한국군사과학기술학회지
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• 제21권2호
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• pp.225-234
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• 2018

In this paper, we consider a problem of partitioning a search area into smaller rectangular regions, so that multiple platforms can conduct search operations independently without requiring unnecessary coordination among themselves. The search area consists of cells where each cell has some prior information regarding the probability of target existence. The detection probability in particular cell is evaluated by multiplying the observation probability of the platform and the target existence probability in that cell. The total detection probability within the search area is defined as the cumulative detection probability for each cell. However, since this search area partitioning problem is NP-Hard, we decompose the problem into three sequential phases to solve this computationally intractable problem. Additionally, we discuss a special case of this problem, which can provide an optimal analytic solution. We also examine the performance of the proposed approach by comparing our results with the optimal analytic solution.

• 대한지구과학교육학회지
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• 제2권1호
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• pp.55-61
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• 2009

This study was designed to explore problem solving process to earth science area by elementary science gifted children, which compared and analyzed the questionnaires and problem solving to earth science area by gifted Science education center, Seoul National University Of Education, The analyzed results showed difference by gender that in the science study level at the time of entrance to the gifted Science education center, male students was the highest in the middle school as 37.5%, and female students in the elementary 6th grade as 61.5%. And male students were investigated to do more precedent study than female students. Secondly, in the problem solving process of earth science related problems, males made most use of problem solving process area(30.3%), and females symbolizing (27.5%) area. Thirdly, comparison of reasoning technology in problem solving process by gender indicated that both sexes made the most use of analytical reasoning (male 62.0%, female 53.6%) to solve problems.

• Journal of Electrical Engineering and Technology
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• 제8권4호
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• pp.744-751
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• 2013

In this paper, Secant method is proposed to solve multi area economic dispatch (MAED) problem. Generator limits of all generators in each area are calculated at given area power demands plus export (or import) using secant method and the generator limits of all generators are modified as modified generator limits. Central economic dispatch (CED) problem is used to determine the output powers of all generators. Here, Secant method is applied to solve the CED problem. The proposed approach has been tested on two-area (two generators in each area) system and four-area (four generators in each area) system. It is observed from various cases that the proposed approach provides optimally best solution in terms of cost with tie line loss with less computational burden.

• Journal of Electrical Engineering and Technology
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• 제9권2호
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• pp.415-422
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• 2014

This paper presents a new approach to solve the multi area unit commitment problem (MAUCP) using an evolutionary programming based particle swarm optimization (EPPSO) method. The objective of this paper is to determine the optimal or near optimal commitment schedule for generating units located in multiple areas that are interconnected via tie lines. The evolutionary programming based particle swarm optimization method is used to solve multi area unit commitment problem, allocated generation for each area and find the operating cost of generation for each hour. Joint operation of generation resources can result in significant operational cost savings. Power transfer between the areas through the tie lines depends upon the operating cost of generation at each hour and tie line transfer limits. Case study of four areas with different load pattern each containing 7 units (NTPS) and 26 units connected via tie lines have been taken for analysis. Numerical results showed comparing the operating cost using evolutionary programming-based particle swarm optimization method with conventional dynamic programming (DP), evolutionary programming (EP), and particle swarm optimization (PSO) method. Experimental results show that the application of this evolutionary programming based particle swarm optimization method has the potential to solve multi area unit commitment problem with lesser computation time.

• 아동학회지
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• 제26권5호
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• pp.281-295
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• 2005

The study investigated cognitive and creative characteristics related to creative problem solving of intellectually gifted and average children. Fourth and 6th graders from elementary schools in I and B cities and gifted classes in K and I cities were administered the KEDI group IQ test and categorized into gifted(above IQ 125) and average(IQ 90-109) groups. A total of 371 children were selected through this procedure and were tested on formal operational tasks, general metacognitive knowledge, creativity characteristics scales, and creative problem solving tasks. Gifted children were superior to average children on all cognitive and creativity characteristics. For the gifted, grade and metacognition were significant predictors of creative problem solving in the verbal area, and all cognitive and creativity characteristics were significant predictors in the math area. For the average children, grade and metacognition were significant predictors of creative problem solving in the verbal area, and only grade was a significant predictor in the math area.

• 한국콘텐츠학회논문지
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• 제20권3호
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• pp.149-163
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• 2020

본 연구는 카지노 주변 체류자의 문제도박이 우울을 통해 자살생각에 미치는 영향과 성별의 조절된 매개효과 분석을 목적으로 수행되었다. 이를 위해 한국도박문제관리센터에서 실시한 카지노 주변 체류자 실태조사 원자료의 표본 298명을 대상으로 Process Macro for SPSS를 활용하여 분석을 수행하였다. 주요 분석 결과는 다음과 같다. 첫째, 카지노 주변 체류자의 문제도박은 자살생각에 정적으로 유의미한 영향을 미쳤다. 둘째, 카지노 주변 체류자의 우울은 문제도박이 자살생각에 미치는 영향을 완전 매개하였다. 셋째, 카지노 주변 체류자의 우울이 자살생각에 미치는 영향을 성별이 조절하는 것으로 나타났다. 넷째, 카지노 주변 체류자의 문제도박이 우울을 통해 자살생각에 미치는 영향에서 성별의 조절된 조건부 매개효과가 확인되었다. 이상과 같은 연구결과를 토대로 카지노 주변 체류자의 문제도박과 자살생각에 대한 개입 방안에 관하여 논의하였다.

• 대한수학교육학회지:수학교육학연구
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• 제25권3호
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• pp.461-472
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• 2015

새 교육과정에서는 평행사변형과 삼각형의 넓이 공식을 귀납 추론으로 지도한다. 귀납적 사고는 수학교육에서 매우 중요한 목표이다. 그러나 귀납적으로 도형의 넓이 공식을 추론하는 데는 많은 문제가 있다. 이론적으로 그리고 초등학교 5학년을 대상으로 한 조사를 통해 그러한 문제를 드러내고, 도형을 변형하는 문제해결 과정으로 넓이 공식을 지도하는 방법을 제안한다.

• 가정과삶의질연구
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• 제7권1호
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• pp.1-14
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• 1989

The purpose of this study was to identify the problems in the consumption life of household over the family life cycle so that they would support to select the consumer education subjects and the establish the long-term household plan. For these purposes, a survey was conducted using questionnaire. The data used in this study included 562 homemakers living in Seoul. Statistics used for data analysis were frequency distribution, Mean, Percentile, One-way Anova, Scheffie-test, Multiple Classification Analysis. Major findings were as follows; 1) In the level of the problems in the consumption life of household, housing problem, durable goods problem, healthy-medical problem and child education problem area were in the low level. Leisure problem and properties management problem area were in the high level. 2) The problems in the consumption life of household differed significantly over the family life cycle. 3) When controlling family monthly income and education level of husband was compared with not-controlling them, the influences of family life cycle on the problems in the consumption life were as follows. (1)At housing problem area, the effect of the FLC was higher in controlling them than not-controlling them. (2) At other problems the effects of the FLC was lower or same in controlling them than not-controlling them.