• 한국초등과학교육학회지:초등과학교육
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• 제37권2호
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• pp.161-172
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• 2018

This study investigated the changes in representation on analogies that elementary science-gifted students generated by using Algodoo program to explain the electric current. After the students were taught about the 'components in circuit and their function' and 'electric current' with teacher centered analogy and PhET program for 4 class hours, they generated analogies to the electric circuit. Then they compared the similarity between generated analogy and target concept and matched it to the target concept. The result revealed that the battery, light bulb, and electric wire were changed according to the change of representations on free electrons. And they generated more proper analogies reflected the target concept when represented the free electrons by the circular particles than the water. From these results, we can say that generating analogy using Algodoo program is the effective education activity to help students understand abstract concept by visualizing it more easily and simply.

• 부모자녀건강학회지
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• 제8권1호
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• pp.75-88
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• 2005

Purpose: This study was to examine the relationship between perceived the past parent-child relationship(caring and overprotection), present parent-child attachment (communication, confidence, alienation) and self-concept of woman college students. Method: The data was collected from March 15 through 26, 2004. The subjects in this study were 395 students who attended universities located in N and T city. The data analyzed using with SAS program, and analysis of variance, Pearson correlation analysis, multiple regression. Results: Concerning the connection of demographic variables to the past parent-child relations(caring and overprotection), current parent-child attachment(communication, confidence, alienation) made a Significant difference in economic family standard (p<.05), educational level of their fathers(p<.01), birth of order(p<.05) and whether or not they lived with their parents under the same roof(p<.05), past experience of living with their parents under the same roof(p<.01). The relationship of the past parent-child relations(caring and overprotection), and current parent-child attachment(communication, confidence, alienation) made a significant difference to communication(p<.001), confidence(p<.001), alienation(P<.001). The correlation among the past parent-child relations(caring and overprotection), current parent-child attachment(communication, confidence, alienation) and self-concept, caring had significantly positive correlation(p<.001) with communication(r=0.631), confidence(r=0.669) and self-concept(r=0.520), and had significantly negative correlation(p<.001) with overprotection(r=-0.369), alienation(r=-0.531). The overprotection had Significantly negative correlation(p<.001) with communication(r=-0.303) confidence(r=-0.369) and self-concept(r=-0.292), and that had significantly positive correlation(p<.001) with alienation (r=0.275). Overall, the past parent child relations(caring and overprotection) made a 28.2% prediction of self-concept, and the current parent-child attachment(communication, confidence and a sense or alienation) made a 46.1% prediction or self-concept, and their predictability was all significant. Conclusion: This study suggests that perceived the past parent-child relationship(caring and overprotection) is significant influencing factors on present parent-child attachment(communication, confidence, alienation), self-concept. Therefore, nursing strategy is needed to manage these revealed factors.

• Journal of Mechanical Science and Technology
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• 제19권5호
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• pp.1072-1079
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• 2005

Conceptual design is the first step in the overall process of product design. Its intrinsic uncertainty, imprecision, and lack of information lead to the fact that current conceptual design activities in engineering have not been computerized and very few CAD systems are available to support conceptual design. In most of the current intelligent design systems, approach of principle synthesis, such as morphology matrix, bond graphic, or design catalogues, is usually adopted to deal with the concept generation, in which optional concepts are generally combined and enumerated through function analysis. However, as a large number of concepts are generated, it is difficult to evaluate and optimize these design candidates using regular algorithm. It is necessary to develop a new approach or a tool to solve the concept generation. Generally speaking, concept generation is a problem of concept synthesis. In substance, this process of developing design candidate is a combinatorial optimization process, viz., the process of concept generation can be regarded as a solution for a state-place composed of multi-concepts. In this paper, genetic algorithm is utilized as a feasible tool to solve the problem of combinatorial optimization in concept generation, in which the encoding method of morphology matrix based on function analysis is applied, and a sequence of optimal concepts are generated through the search and iterative process which is controlled by genetic operators, including selection, crossover, mutation, and reproduction in GA. Several crucial problems on GA are discussed in this paper, such as the calculation of fitness value and the criteria for heredity termination, which have a heavy effect on selection of better concepts. The feasibility and intellectualization of the proposed approach are demonstrated with an engineering case. In this work concept generation is implemented using GA, which can facilitate not only generating several better concepts, but also selecting the best concept. Thus optimal concepts can be conveniently developed and design efficiency can be greatly improved.

• 전자통신동향분석
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• 제36권3호
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• pp.34-40
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• 2021

For developing a switching device of a new concept that cannot be implemented with a semiconductor device, we introduce the Mott insulator-metal transition (IMT) phenomenon occurring out of the semiconductor regime, such as the temperature-driven IMT, the electric-field or voltage-driven IMT, the negative differential resistance (NDR)-IMT switching generated at constant current, and the NDR-based IMT-oscillation. Moreover, the possibilities of new concept IMT switching devices are briefly explained.

• 전력전자학회논문지
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• 제18권6호
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• pp.587-592
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• 2013

In this paper, the performance improvement of the sensorless control of IPMSM employing the active flux concept by the improved current estimator is presented. The accuracy of the current estimator used in a previous report is degraded when the motor parameters are not known exactly. A simple current estimator derived from estimated flux is proposed to improve the position estimation performance. In order to show the usefulness of the proposed estimation method, the simulation results using Matlab/Simulink and the experiment results are presented.

• Journal of Power Electronics
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• 제2권3호
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• pp.189-198
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• 2002

New concept of energy recovery for plasma display panel (PDP) Is proposed. Different from conventional LC resonant sustaining drivers, the current built up before inverting the polarity of the panel electrodes is utilized to change the panel Polarity together with energy Previously charged in Panel capacitance. This operation Provides zero -voltage-switching of switches and reduction of EMI by rejecting the surge current when the sustain switches are turned on. The build-up current helps to reduce transition time of panel polarity and may produce more stable light waveforms. This method shows a desirable characteristic that the circuit loss is similar to that of series resonant type energy recovery circuit which is very effective method.

• 동의생리병리학회지
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• 제25권5호
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• pp.777-789
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• 2011

This study focuses on seeking a desirable direction for the discussions about identity issue of the current Traditional Korean Medicine(TKM). The identity issue of the current TKM is about asking what exactly the current TKM is, what sets the TKM apart from the other medical systems, and what value the TKM has in the contemporary settings, and seeking suitable answers to all these questions. The most important factor that affects these answers is what kind of the concept of identity we have. Current discussions of the identity issue of the TKM take narrow and inflexible concepts of identity such as "Numerical Identity," or "Qualitative Identity", not suitable for TKM, which is always changing and open to other academic fields. This study suggests that Hannah Arendt's concept of identity is more desirable for the TKM, which highlights pluralism and relations, as well as defining identity as a creative, positive, and open-ended process. In addition, this study also suggests that taking a closer look at the "field", which has previously been hidden behind the discourse on the "modernization", will help in figuring out what exactly the identity of the current TKM is. Lastly, the current discussions about "unification of Eastern and Western medical system", and "Integrative Medicine" in Korea will affect the identity issue of TKM.

• 한국컴퓨터정보학회논문지
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• 제3권2호
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• pp.229-238
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• 1998

현행원가회계시스템의 핵심개념인 경영이익개념은 현행영업이익과 보유이득으로 구성된다. 보유이득의 성격에 대해서는 자본수정설과 이익설의 두가지 견해가 있다. 전자의근거는 조업능력유지개념인 반면, 후자의 근거는 재무자본유지 개념이다. 현행원가회계 주장자들은 그것이 전통회계보다 더욱 유용한 정보를 제공한다고 확신하고 있다. 재무자본지지자들은 현행원가정보가 경영자들의 과거의사결정의 평가에 필요하고, 따라서 그들의 의사결정능력을 개선할 수 있다고 한다. 실물자본지지자들은 기업을 지속적으로 경영하기 위하여 기업의 조업능력이 유지되었는지를 알아야 할 필요성을 강조한다. 역사적원가회계 지지자들은 현행원가회계가 자산을 판매하기 전에 자산가치의 증가를 인식함으로써 전통적인 수익인식원칙을 위반하고, 회계과정에 지나치게 주관성이 개입되어 있다고 믿는다.

• 영재교육연구
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• 제5권2호
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• pp.37-54
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• 1995

The radical development of modern mathematics is due to the appearance of Collection Theory by George Cantor. The Set Theory is independent as an area and also closely interrelated with other areas. So its content becomes a common sense and a basic part across the whole area of modern mathematics. Accordingly, the basic element of modern mathematics is helping young children get familiar with set as early as possible. The thinking of set by which children can categorize, make partial sets and correspondences, understand the general characteristic, and conceptualize the discovered relationships is very important for young children. At this point where the Math education for young children is emphasized under the influence of the modernization movement of Math education, the systematic education for building up the set concept as the basic background of number concept during the early childhood is required. On current mathematics education for young children, graphs, the foundation of geometry, time, and patterns have been included in the traditional and practical content related to numbers. However, the education on collection which is the foundation of number concept is insufficient. A study shows that the level of young children's understanding on set is quite high, but the set concept isn't reflected in current Math curriculum for young children. And basic activities neccesary on building up the set concept, such as categorization, comparison, etc. are conducted in kindergardens but unsatisfactory because of those kindergarden teachers' premature understanding on the set concept. In conclusion, the curriculum for young children should be reorganized based on the set concept as the kernel concept. Also, the reappraisal of the training curriculum and the supplementary efucation for kindergarden teachers are urgent for raising the teaching ability of those kindergarden teachers.

• The Journal of Korean Physical Therapy
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• 제20권4호
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• pp.43-50
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• 2008

Purpose: To investigate the relationship between self-concept and mental health of physical therapy students. Methods: We recruited 179 currently enrolled college freshman, sophomores, and juniors studying physical therapy. The instruments used for this study were Rosenberg's Self-esteem Scale, Choi Chung Hoon's Perceeptual Orientation Scale, and the Mental Health Test modified by Lee. Results: The mean self-concept score was 3.97, a positive self concept, and the mean mental health score was 1.04. The mean dimension score for mental health ranged from: r=0.79$\sim$r=1.29. The relationship between self-concept and the mental health showed a negative correlation (r=-0.693, p<0.01). Conclusion: Modifications to the current program may improve self-concept and the mental health of physical therapy students.