• Tunnel and Underground Space
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• v.30 no.1
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• pp.87-97
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• 2020

Fracture toughness of rock is a constant that can indicate the initiation and propagation of cracks due to blasting, excavation, etc. Scaled model tests have been applied to the behavior of tunnels and the stability of limestone mines. Through the scaled model, damaged zone evaluation due to blasting is also carried out, and the scale factor is not applied to the failure-related factors. In this study, DCT (diametral compression test) and finite element method ATENA2D numerical analysis results were compared to determine whether the scale factor could be applied to the fracture toughness of rock. The theoretical values of the scale factor applied to the fracture toughness of the rock and the DCT test results and the numerical results are 0.21~0.46, 0.40, and 0.99MPa ${\sqrt{m}}$ respectively, so these three values should be considered when determining scale factor. It is necessary to derive a suitable scale factor in consideration of the length, time, and mass to which the scale factor is applied, as well as the values of the scale factor of major design factors such as uniaxial compressive strength and density.

• Journal of the Korea Society of Computer and Information
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• v.27 no.6
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• pp.149-155
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• 2022

In this paper, we propose the importance of character education in nursing curriculum. It is quite difficult to define what character is. It is solely because a person's character is very abstract yet comprehensive at the same time. Nevertheless, the East defines character as someone's personality that he or she is naturally born with. Someone's character contains two elements: what he or she was born with, a nature, and how the person has and is to become. The nature is difficult to change through education since one is born with such disposition. However, another half of one's character can be educated to be reformed and developed in the right manner. And this specific education is called character education. Today in Korea, education to cultivate one's character has become a cause celebre, especially when evaluating a nursing department's certification. To be a good nurse, one must not only be skillful but also has the ability to help others or make ethical and clinical judgments. Yet, most nursing departments in Korea out there are overwhelmingly focused on the curriculum related to obtaining licenses and to become a registered nurse. Thus, this is to suggest alleviating such a stress and expanding the curriculum for character education.

• Journal of Korean Elementary Science Education
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• v.34 no.2
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• pp.194-209
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• 2015

본 연구의 목적은 스크래치 프로그래밍을 활용한 초등과학 '작은 생물' STEAM 수업을 개발하고 적용하여, 초등 영재학생의 창의적 인성, 창의적 문제해결력, 과학적 태도의 향상에 어떠한 영향을 미치는지 알아보고자 하였다. 개발한 STEAM 수업은 과학 지식과 스크래치 프로그래밍을 통합한 내용적 융합의 방법을 통해 학습자가 창의적 설계와 감성적 체험을 효과적으로 경험할 수 있도록 설계되었다. 연구 대상은 26명의 초등과학 영재학생들이었으며, 양적 및 질적 접근을 통해 자료를 수집하였다. 7차시의 수업을 적용한 결과, 개발한 STEAM 수업이 창의적 인성 및 과학적 태도에 효과가 있었다. 창의적 인성 하위 요소 중, 독립성에서 효과가 있었으며, 과학적 태도 측면에서는 자발성 및 인내심에서 유의한 상승을 보였다. 본 연구는 생명 과학 및 컴퓨터 프로그래밍처럼 STEAM 수업을 위한 효과적인 수단을 통합하는 일이 과학 기술에 대한 학생들의 창의성과 흥미를 신장시킬 수 있음을 제안한다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2014.07a
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• pp.179-180
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• 2014

본 논문에서는 창의인성을 계발하기 위한 프로그래밍 교육 과정의 필요 요소를 논의하고자 한다. 프로그래밍 학습은 일반적인 상태에서 목적 상태로 변화하기 위한 방안을 구상하여 실행하는 전형적인 문제해결학습의 형태를 띤다. 이러한 프로그래밍 학습이 창의성을 길러주기 위해서는 학습자가 확산적으로 사고할 수 있는 교육내용이 포함되어야 한다. 또한 학습자의 인성을 향상 시키기 위해서는 학습자간의 의사소통과 교류를 강화하는 교수학습방법을 사용하고, 도덕적 논의를 교육 내용에 포함해야 한다.

• Journal of the Korea Institute of Military Science and Technology
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• v.1 no.1
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• pp.154-165
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• 1998

In this paper, the mongrel singular element with 6 node triangle and 8 node quadrilateral element with J-integral are developed and applied to the various plane crack problems for the isotropic material. The convergence nature is excellent for various crack size with even coarse mesh using the direct method. But the results of the mongrel element with J-integral are worse than the former's ones. Fracture tests were conducted on precracked CT specimens. Results show that, for 7075-T6 aluminum wing spar materials, the fracture toughness is 31.06 ksi.inch $\frac{1}{2}$ in the L-T direction.

• Journal of Korean Tunnelling and Underground Space Association
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• v.15 no.6
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• pp.547-557
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• 2013

The mode II fracture toughness and strength due to shear stress are important parameters in the stability of caprock and injection zone with application to geological sequestration of carbon dioxide. In this research, a short beam compression test has been used to determine the shear strength and the mode II fracture toughness for Coconino sandstone. The average value of the shear strength and mode II fracture toughness are estimated to be 23.53 MPa and 1.58 MPa${\surd}$m respectively. The stress intensity factor is suggested by finite element analysis using the displacement extrapolation method. The effect of biaxial stress and water saturation on the fracture toughness has also been investigated. The fracture toughness increases with confining stresses, but decreases by 11.4% in fully saturated condition.

• Journal of Gifted/Talented Education
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• v.22 no.2
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• pp.451-465
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• 2012

The purpose of this study is to analyze the effects of a Goldberg device learning program on primary gifted students' creative personality. Based on the concept of creative personality derived from a literature review, a learning program has been developed and applied to 18 primary gifted class students and 20 invention club students. Creative personality consists of eight components: patience/persistence, confidence, humor, curiosity, imagination, openness, adventurous spirits, and independence. Creative personality tests were conducted before and after Goldberg device learning program lessons. The results of the tests indicate that (1) the Goldberg device learning program affected all eight components of creative personality positively; and (2) the invention club students showed a greater improvement in creative personality than the gifted class students. These findings suggest that Goldberg device learning programs can be effective to learn various scientific principles and improve students' creative personality.

• Journal of the Korean Institute of Gas
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• v.2 no.1
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• pp.74-82
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• 1998

The grain boundary etching method as a technique for assessing degradation of structural materials used at elevated temperature has received much attention since it is simple, inexpensive and easy to apply to real plant components. In this study, the technique is applied to some aged petroleum and chemical plant components such as reactors and drums. As a degradation parameter, intersection number ratio ($N_i/N_o$), is employed. The intersection number ratio ($N_i/N_o$) is defined as the ratio of intersection number ($N_i$) obtained from 5-minute picric acid etched surface to the number ($N_o$) obtained from Nital etched surface. In order to study degradation level, several relationships were measured such as the correlation between shift in ductile brittle transition temperature, $({\Delta}DBTT)_{sp}$ and intersection number ratio, ($N_i/N_o$) and the correlation between the measured ($N_i/N_o$) values and Larson-Miller Parameter values.

• The Bulletin of The Korean Astronomical Society
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• v.30 no.1
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• pp.45.1-45.1
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• 2005

• Electrical & Electronic Materials
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• v.11 no.7
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• pp.604-609
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• 1998