• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.12
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• pp.8915-8926
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• 2015

The purpose of this study was to find out difference by early childhood teachers' personality and individual factor. Also we wanted to find out the status, need and awareness of character education for early childhood education. Our targets are 194 early childhood teachers who are working in D city in Chungcheongnam-do. We analyzed out data with by SPSS 21.0 program. The results show that First, there was significantly difference in teachers' personality by career and age. Second, while early childhood teachers sympathize importance and need of personality education, absence of methods for practice is obstacle. Third, A high level personality group notices that respect for early children' life, humanity and virtue of relationship is importance virtue. Fourth, Therefore they consider respecting people as aim of personality education and recognize that they need to teach right values through whole area as education contents. Fifth, A low level personality group notices that performance of their duty and manners of early children is needed virtue. They consider manners education as aim and content of personality education also recognize guiding with connecting home teaching is desirable. So, teachers need, above all, chance for reflective thinking by themselves for early childhood character Education.

• Composites Research
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• v.29 no.6
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• pp.328-335
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• 2016

The purpose of this study is to develop fiber reinforced cement matrix composite (ECC) produced with limestone powder in order to achieve high ductility of the composite, and to evaluate flexural performance of structural members made with ECC. Four kinds of mixture proportions were determined on the basis of the micromechanics and a steady state cracking theory considering the matrix fracture toughness and fiber-matrix interfacial characteristics. The mechanical properties of ECC, represented by strain-hardening behavior in uniaxial tension, were investigated. Also, strength property of the composite was experimentally evaluated. Two structural members made with ECC were produced and tested. Test results were compared with those of conventional concrete structural members. Increased limestone powder contents of ECC provides higher ductility of the composites while generally resulting in a lower strength property. ECC structural members exhibited higher flexural ductility, higher flexural load-carrying capacity and tighter crack width compared to conventional structural members.

• The Journal of Korean Philosophical History
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• no.25
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• pp.7-40
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• 2009

The aim of this paper is to establish the theoretical foundation on "the integrative study of the character education for the promotion of social and emotional competencies of children.". Based on the social and emotional learning(SEL), this paper is tried to find out the effective ways to develop children's good character. According to SEL, social and emotional competence is the ability to understand, manage, and express the social and emotional aspects of one's life in ways that enable the successful management of life tasks such as learning, forming relationships, solving everyday problems, and adapting to the complex demands of growth and development. And it is also the process of acquiring and effectively applying the knowledge, attitudes, and skills necessary to recognize and manage emotions. Five key competencies such as self-awareness, social awareness, responsible decision making, self-management, relationship skills are taught, practiced, and reinforced through SEL programming. Both the social and emotional learning movement and the character education share in common the idea that much of human character can be modified for the better through learning. While character educators engage in developing civic virtue and moral character in our youth for more compassionate and responsible society, SEL educators engage in educating for a safe, secure, caring society. To effectively teach social and emotional competencies, the teachers themselves must embrace a teaching and learning philosophy that models the attitudes, feelings, and behaviors we aim to teach.

• Proceedings of the KSME Conference
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• 2003.04a
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• pp.346-351
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• 2003

In this paper, an evaluation method of fracture toughness on interface cracks has been investigated under various mixed-mode conditions of the bonded scarf joints. Two types of the bonded scarf joints with an interface crack were prepared to analyze the stress intensity factors using boundary element method(BEM) and to perform the fracture toughness test. From the results of fracture toughness experiments and BEM analysis, an evaluation method of fracture toughness on interface cracks in the bonded components of dissimilar materials has been proposed and discussed.

• Journal of Korean Association for Spatial Structures
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• v.6 no.2 s.20
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• pp.7-12
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• 2006

최근 환경문제에 대한 해결책으로 목조건물의 해체 및 목재의 재사용에 대한 관심이 높아지고 있다. 목조건물을 접합철물에 의해서 접합할 경우에는 건물의 해체시에 철재를 사용하지 않아 목부재의 절단이 매우 용이하고 목재의 재사용이 용이하도록 하는 장점을 가지고 있다. 대나무의 높은 인성은 목재 접합부의 강도와 안정성 확보를 가능하게 해주고 있다. 대나무 접합물은 2005년 일본 Aichi 세계박람회에서 Japan pavilion Nagakute 전시관 건물이 대나무 접합부를 사용한 목조건물이다.

• Journal of The Korean Association of Information Education
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• v.5 no.1
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• pp.1-13
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• 2001

Several problems occur including lack of humanity, confinement of creativeness, lack of independent learning capability, when elementary students are taught computer, since the they learn only basic functions of computer in general. Accordingly, it is required to have subject-integrated textbook with which they learn curriculum and nurture the humanity as well as creativeness, while studying functions of computer. In light of this, I plan to develop computer textbook, which divided the contents of Hangul 97 and Windows 98, operation system, per subject, and organized them in the order of question to study for himself, part to learn function, formation evaluation, study on subject integration study related to curriculum, part to raise creativeness, and supplementary study, after extracting the contents of curriculum, creative factor and humanity factor suitable for each subjects. By realizing the subject-integrated textbook that enables the interaction by taking advantage of dynamic feature of web, this textbook aims to raise the humanity and creativeness while learning the functions of computer.

• Proceedings of the Korea Concrete Institute Conference
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• 2008.11a
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• pp.753-756
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• 2008

HPFRCC (High-Performance Fiber Reinforced Cementitious Composites), which is relatively more ductile and has the characteristic of high toughness with high fiber volume fractions, can be used in structures subjected to extreme loads and exposed to durability problems. In the case of using PVA(polyvinyl alcohol) fibers, it is noted by former studies that around 2% fiber volume fractions contributes to the most effective performance at HPFRCC. In this study, therefore, compressive and flexural tests were implemented to evaluate the compressive and flexural capacities of HPFRCC while the total fiber volume fractions was fixed at 2% and two different PVA fibers were used with variable fiber volume fractions to control the micro-crack and macro-crack with short and long fibers, respectively. Moreover, specimens reinforced with steel and PVA fiber simultaneously were also tested to estimate their behavior and finally find out the optimized mixture. In the result of these experiments, the specimen consists of 1.6% short fibers (REC 15) and 0.4% long fiber (RF4000) outperformed other specimens. When a little steel fibers added to the mixture with 2% PVA fibers, the flexural capacity was increased, however, when high steel fiber volume fractions applied, the flexural capacity was decreased.

• Journal of the Korea Concrete Institute
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• v.14 no.4
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• pp.449-456
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• 2002

Recently, the application of high strength and high performance concrete has been gradually increased as an important construction material for high rise and huge scaled construction. However, high performance concrete has undesirable characteristics of spalling subjected to high temperature due to its dense microstructure content. A spalling by fire brings surface failure and falling off concrete member. It is considered that spalling by fire should be taken into account for the safety of the concrete structure under fire. Therefore, in this paper, tests are carried out using high performance concrete containing polypropylene(PP) fiber in order to improve the fire resistance performance. PP fiber contents and member sizes are varied. According to experimental results, as for the influence of PP fiber contents, all the test specimens without PP fiber show entire failure in W/C of 35％, while they show nearly sound shape except some kinds of surface fracture in W/C of 55％. When PP fiber is contained more than 0.07％, favorable prevention effects of spatting by fire are obtained. As for the effects of test specimens size, it tends to increase the possibilities of spatting by fire as test specimens become larger. And spatting by fire at the edge of test specimens occurs more frequently than at the surface of test specimens. Residual compressive and tensile strength shows 45∼65 ％ of its original strength at W/C of 35％, and 30∼40％ at W/C of 55 ％.

• Composites Research
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• v.19 no.4
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• pp.15-22
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• 2006

One of the primary factors limiting the application of composite-metal adhesively bonded joints in structural design is the lack of a good evaluation tool for the interfacial strength to predict the load bearing capacity of boned joints. In this paper composite-steel adhesion strength is evaluated in terms of stress intensity factor and fracture toughness of the interface corner. The load bearing capacity of double lap joints, fabricated by co-cured bonding of composite-steel adherends has been determined using fracture mechanical analysis. Bi-material interface comer stress singularity and its order are presented. Finally stress intensities and fracture toughness of the wedge shape bi-material interface corner are determined. Double lap joint failure locus and its mixed mode crack propagation criterion on $K_1-K_{11}$ plane have been developed by tension tests with different bond lengths.

• Journal of the Korean Wood Science and Technology
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• v.42 no.3
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• pp.282-289
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• 2014

After being laminated with a combination of glass fiber reinforced plastic and plywood, the GFRP laminated plate was densificated for 1 hour at $150^{\circ}C$ with pressure of $1.96N/mm^2$. A partial reinforced beam was produced by attaching the 5 GFRP laminated plates to the joint of glulam and the column. In addition, the column to beam joint was produced by using reinforced laminated wooden pin which was made of GFRP sheet and plywood, fiber glass reinforced cylindrical-LVL column. The joint was made of round log, glulam and drift pin as the reference specimen, and its moment resistance was evaluated. As a result, the strength performance of specimens with partial reinforced beams were 1.8 times stronger than the reference specimen on average. Furthermore, rupture was neither occurred on partial reinforced beam nor column. Toughness and stiffness of joints were also fine. The GFRP sheet reinforced laminated plate showed better reinforcement effect than GFRP textile reinforced one. GFRP sheet was inserted into each layer of laminate, and it showed good condition in rotation-angle and strength, therefore it is the most appropriate to reinforce the part of the beam.