• The Journal of the Korea Contents Association
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• v.21 no.3
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• pp.653-663
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• 2021

The purpose of this study was to examine the effects of ambivalent sexism and focusing manner on self-concept for middle-aged women, and to verify the factors that can help middle-aged women's positive self-concept. The self-concept scale, the focusing manner scale, and the ambivalent sexism scale were used for this study through the online community targeting middle-aged women aged 35 to 55. As a result of the analysis using SPSS 21.0, it was investigated that there was a significant positive correlation between hostile sexism and benevolent sexism. In addition, It was found out that ambivalent sexism had a significant negative effect on self-concept. It was found out that the high hostile sexism of ambialent sexism led to lowering the self esteem, emotional stability, problem solving stability, interpersonal relationship and interpersonal trust of middle-aged women. Focusing manner had a significant positive effect on self concept, but there were differences for each sub-factor. Express, accept, and keeping one's composure had a significant positive effect, while awareness had a negative effect, and reflecting attitude did not have a significant effect. Finally, limitations of this study were discussed.

• Journal of the Korean Society for Railway
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• v.17 no.1
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• pp.28-34
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• 2014

In this paper, a concept design of a rail type ultra-high-speed train is proposed and its dynamic characteristics are analyzed. Instead of the existing solid axle, a new type bogie system and independently rotating wheels are applied in the proposed train. In order to analyze the dynamic characteristics, a multibody dynamic model of a vehicle is developed and the basic validity is verified by eigenvalue analysis. Also, it is shown that the critical speed is improved in comparison to that of existing high-speed train model HEMU-430X. Finally, through 7000R curved track driving analysis at a speed of 550 km/h, the lateral force of the wheels and the derailment quotient are estimated and the applicability of the new concept railway vehicle is confirmed.

• School Mathematics
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• v.12 no.4
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• pp.547-561
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• 2010

Even though statistics is considered as one of the areas of mathematical science in the school curriculum, it has been well documented that statistics has distinct features compared to mathematics. However, there is little empirical educational research showing distinct features of statistics, especially research into the understanding of statistical concepts which are different from other areas in school mathematics. In addition, there is little discussion of a relationship between the ability of mathematical thinking and the ability of understanding statistical concepts. This study extracted some important concepts which consist of the fundamental statistical reasoning and investigated how mathematically high achieving students understood these concepts. As a result, there were both kinds of concepts that mathematically high achieving students developed well or not. There is a weak correlation between mathematical ability and the level of understanding statistical concepts.

• Journal of the Korea Convergence Society
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• v.13 no.1
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• pp.229-234
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• 2022

The non-destructive method of easily evaluating concrete strength through the concept of maturity has been verified by many researchers. The current work introduced such a concept in concrete strength assessment that involved 843 variables and specific values that 11 papers used in experiments, including constant temperatures (5, 10, 20, 30, 40, 50℃) with a W/B range of 18 to 70% and different curing ages (0.5 to 182 days). The classification of concrete as being of normal-strength concrete (40MPa or less), high-strength concrete (40~70MPa), and Super high-strength concrete (70MPa or more) enabled this study to identify the relationship between maturity and concrete strength using the most convenient and easily applicable maturity model in the construction field. A regression formula of lowest guaranteed concrete strength on the basis of maturity was presented.

• Journal of The Korean Association For Science Education
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• v.19 no.2
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• pp.305-314
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• 1999

The effects of three teaching models were compared in this research. One of those is concept change model, another is concept change model based on students learning motivations, the other is traditional teaching method based on science textbooks. The subjects of this research were the 8th grade students of Korean middle school. They were divided into three groups, and tested learning motivations. All of the three groups improved their learning motivations and concept understanding by the classes. Especially, the group of concept change model based on students learning motivations represented most effective improvement of learning motivations. The concept change teaching model and concept change teaching model based on students learning motivations are more effective in concept understanding than traditional teaching method based on textbooks. The students who have high learning motivations improved their concept understanding by the classes of concept change model based on students learning motivations. The students who have low learning motivations improved their learning motivations by the classes of concept change model based on students learning motivations also.

• The Journal of the Convergence on Culture Technology
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• v.6 no.2
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• pp.321-325
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• 2020

The purpose of this study is to re-concept the future battle of the Army, which combines the effects of advanced technology on the concept of combat and the AICBM technology. The "war concept" changes with the times, and can be seen through the following two examples. First, it is a concept that achieves relative superiority by analyzing enemies. A case in point is the U.S. military's development of a "public joint battle" into a "multi-domain operation." Second, it is 'science and technology' that leads to a change in the concept of combat. A case in point is that the firepower warfare on land and sea in World War I developed from World War II to "air warfare" due to the emergence of aircraft. In this regard, the U.S. military is focusing on the concept of fighting in line with the future operational environment based on high-tech science and technology and the construction of the future military through the creation of the "Future Command." Therefore, our military needs to utilize the major technologies of the fourth industrial revolution as an opportunity to develop the concept of future combat, and the future war will greatly affect the development of the concept of advanced science and technology carrying out war, as AIC technology based on the fourth industrial revolution will promote innovation in defense operations in the form of super-connected, super-intelligence and super-integration. Therefore, this study will present the impact of advanced technology on the concept of combat and the concept of battle of the future Army incorporating the technology of AICBM.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2000.06a
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• pp.51-60
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• 2000

High-speed milling machine is being sold mainly in the market of die and mold industries, because it reduces machining time greatly as proportion to the spindle speed of machine tool. From the experimental milling tests, it has been cleared that the ball end mill is quite suitable for high speed milling and also tool wear reduces in higher speed milling condition. And a new milling concept with ultra high speed over 100, 000 rpm is proposed for solving the various problems such as NC cutter path generation and NC feed conformity etc.

• 한국정보디스플레이학회:학술대회논문집
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• 2000.01a
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• pp.5-6
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• 2000

Fringe-field switching (FFS) technology exhibiting a high image quality has been developed. In this paper, one pixel concept, manufacturing process, materials, and electro-optic characteristics of FFS mode comparing with conventional in-plane switching mode, and its possible application to reflective type will be discussed.

• Journal of The Korean Association For Science Education
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• v.19 no.1
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• pp.91-99
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• 1999

The researches related to students' preconceptions and conceptual change model have been reported that students' learning motivation is one of the key variable for the conceptual change. The effects of students learning motivations on conceptual changes were evaluated. Subjects of this study were 8th grade students. and they were divided into 2 groups. One group was taught by traditional teaching method, and the other group by concept change teaching model. After the intervention, learning motivations of the students were testified. The students of high motivation who were taught by concept change teaching model showed higher scores in the concept of chemical change than the students by traditional teaching method. But there was no difference in both groups of students who have low learning motivations. The learning motivations before the intervention. the motivations stimulated by classes. and the degree of concept understanding showed high correlation. The motivations stimulated by classes explain 23.3 % of the degree of concept understanding. The results seems to mean that students learning motivations contribute to the understanding of concepts. Especially confidence of learning as a subcategory of the learning motivation contributes significantly to the understanding of new concepts. In contrast, the traditional teaching methods and the teaching methods of concept change learning theory were not effective for the stimulation of students learning motivations.

• Journal of Gifted/Talented Education
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• v.22 no.4
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• pp.985-1007
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• 2012

The achievement motivations of science gifted students are very important in becoming experts who achieve high level. In this study, 77 8th graders of Science Gifted Education Center were divided into highly motivated and low motivated groups. Multidimensional Perfectionism, Self-Concept, Parenting Behaviors Scale were compared between these 2 groups, and predicting variables were verified through regression analysis. As a result, highly motivated students received higher scores on Perfectionism, self-directed Perfectionism, and other-directed Perfectionism. Self-concept scores were higher on factors of body, moral, personalities, social, and abilities as well. In Parenting Behaviors Scale, only the father's affection factor was influenced. The result of regression analysis revealed that self-directed Perfectionism, social self-concept, and moral self-concept had meaningful predictions. In parameter verification, partially mediated effect of self-directed Perfectionism and social self-concept was verified in the relationship between father's affection factor and achievement motivation. This study confirmed that self-directed Perfectionism of science gifted students has positive effects on adaptation. The importance of social and moral education and the father's affection were found as well.