인장하중하의 무한체내 타원체 불균질물의 탄성해석

조의일 여수대학교 1998 論文集 Vol.13 No.2

This paper deals with elastic stress distributions and load carrying capacity of intact and cracked ellipsoidal inhomogeneities. Axisymmetric finite element analysis has been carried out on intact and cracked ellipsoidal inhomogeneities in an infinite body under uniaxial tension. For the intact inhomogeneity, as well known as Eshelby's(1957) solution, the stress distribution is uniform in the inhomogeneity and non-uniform in the surrounding matrix. On the other hand, for the cracked inhomogeneity, the stress in the region near crack surface is considerably released and the stress distribution becomes more complex. Average stress in the inhomogeneity represents its load carrying capacity, and the difference of average stresses between the intact and cracked inhomogeneities indicates the loss of load carrying capacity due to cracking damage. It is found that the cracked inhomogeneity with higher aspect ratio still maintains higher load carrying capacity.

Facile Synthesis of ZnO Thin Films at Low Temperatures Using an Additive-Free Electrochemical Oxidation Method

조의제,김동완,임재영 대한금속·재료학회 2020 대한금속·재료학회지 Vol.58 No.9

Because of their simplicity and low equipment costs, various oxidation methods can be used to create metal oxides, but they still require long processing times and/or high temperatures. In this study, a new electrochemical oxidation (ECO) method, which oxidizes metal in DI water with a constant flowing current to both the cathode and anode, was developed to overcome the disadvantages of conventional oxidation methods. The mechanism of the ECO method is discussed. Metallic Zn films were oxidized by the ECO method in DI water for 1 h. The DI water temperature was varied from 30 to 90 oC to determine the optimal temperature for the ECO process. Increasing the temperature of the DI water led to distinct surface changes in the disk-shaped Zn plate. The intensity of diffraction peaks from the ZnO (002) plane gradually increased from 31.67 to 2806.48. The structural and optical properties of the ZnO thin film were enhanced as the temperature of the DI water approached 90 oC, which means that a high-quality ZnO thin film was synthesized using the ECO method at lower temperatures and shorter processing time compared with established oxidation methods. These results confirm the ECO method can be useful for the low-cost fabrication of transparent and flexible optoelectronic devices.

헤로도토스 - 역사이해의 태도 -

조의설 ( Eui Sul Cho ) 한국서양사학회 1958 西洋史論 Vol.1 No.1

자기 연구(self study)를 통한 초등 세계사 교육 실현 방안 탐색

조의호 글로벌교육연구학회 2022 글로벌교육연구 Vol.14 No.1

This study started with the awareness of the need for world history education in elementary social studies education in response to the needs of the global society. However the former studies has been limited to a theoretical research on elementary world history education. Therefore this study aims to discuss field-based implications through teacher’s self-study to explore ways to realize world history education in the actual elementary school field. The results of the researcher's implementation and reflection of world history education for 5th graders with critical colleagues for about a year are as follows. First, the researcher efficiently selected and organized the contents of the education in consideration of the elementary and secondary curriculum, textbooks, students' level and interest, and teacher's PCK. Second, the researcher used an educational method optimized for the situation by considering the characteristics of elementary history classes while conducting teacher-centered explanatory and student-centered inquiry classes at the same time. Third, the researcher became a learning teacher to overcome realistic barriers such as lack of knowledge of world history content, lack of curriculum restructuring ability, and limited time, and tried to fill the gap between ideal and reality in a modest attitude. Based on the results, the implications related to the realization plan of elementary world history education are as follows. First, it is necessary to organize the field of elementary social studies history centering on the theme. Second, integrated lessons in the field of elementary social studies centered on global problems are needed. Third, it is necessary to develop various educational materials that can be used in elementary world history education and support teacher training. 이 연구는 글로벌 사회의 요구에 대응하여 초등 사회과 교육에서도 세계사 교육이 필요하다는 문제의식에서 출발하였다. 이에 본 연구는 그동안 초등 세계사교육에 관한 선험적인 이론적 연구만으로는 한계가 있다고 보고, 실제 초등학교현장에서 세계사 교육의 실현 방안을 탐색하고자, 교사의 자기 연구를 통한 현장기반 함의를 논의하는 데 목적을 두었다. 연구자가 약 1년간 비판적 동료들과 함께 5학년 학생들을 대상으로 세계사 교육을 실행하고 성찰한 결과는 다음과 같다. 첫째, 연구자는 초중등 교육과정과 교과서, 학생의 수준과 흥미, 교사의 교수내용지식을 고려하여 효율적으로 교육 내용을 선정하고 구성하였다. 둘째, 연구자는 교사 중심 설명식과 학생 중심 탐구식 수업을 병행하면서 초등 역사 수업의특성을 고려하며 상황에 최적화된 교육 방법을 활용하였다. 셋째, 연구자는 세계사 내용 지식과 교육과정 재구성력 부족, 한정된 시간 등과 같은 현실적 장벽을극복하기 위해 학습하는 교사가 되어 겸손한 자세로 이상과 현실의 간극을 메우기 위해 노력하였다. 이를 토대로 초등 세계사 교육을 실현 방안과 관련된 시사점을 제안하면 다음과 같다. 첫째, 초등 사회과 역사 영역을 주제 중심으로 편성할 필요가 있다. 둘째, 지구촌 문제를 중심으로 한 초등 사회과 영역 통합형 수업이 필요하다. 셋째, 초등 세계사 교육에 활용할 수 있는 다양한 교육 자료를 개발하고, 교원 연수를 지원해야 한다.

0.5wt% 탄소강을 이용한 해안 야외부식시험과 염수분무시험,가속부식시험의 가속계수에 대한 연구

조의열 ( E Y Cho ),권기봉 ( G B Gwon ),조대형 ( D H Cho ),김종렬 ( J Y Kim ) 한국부식방식학회(구 한국부식학회) 2013 Corrosion Science and Technology Vol.12 No.5

In the industry, accelerated corrosion test is used for the life time prediction. When anti-corrosion test proceeds in real environments, it is difficult that we predict and evaluate the corrosion life time because of the long test time such as 10 years or more time. Accelerated corrosion test and Salt spray test are able to test corrosion life time of products in the laboratory instead of outdoor corrosion test. Experimental procedure is selected for the corrosion standard specimen, exposure of the specimens, measurements of the mass loss and evaluating the mass loss data. As a result, the acceleration factor of the accelerated corrosion test to the outdoor corrosion test is 414.8. Therefore we can predict the corrosion life time of carbon steel during a short time period.

재일교포의 민족어 교육과 언어 사용 양상

조의성 한국어교육학회(구-한국국어교육연구학회) 2009 한국어교육학회 학술발표논문집 Vol.2009 No.1

북한 단어결합론과 옛 소련 단어결합론 : 60 년 문법을 중심으로

조의성(Eui Sung Cho) 국어학회 2001 국어학 Vol.38 No.-

[유해물질 처리 / 자원화] 농어촌 주택에서 석면 함유 슬레이트의 사용 실태

조의호,박재람,김보람,김여경,이동훈,김용진 한국폐기물자원순환학회 2011 한국폐기물자원순환학회 학술대회 Vol.2011 No.1

방송제작진의 시청자 의견 수용행태에 대한 연구

조의진(Eui-Jin Cho) 한국언론학회 2005 한국언론학보 Vol.49 No.1

The current study examined the interactivity between the audience and producers of television programs in the context of changing broadcasting environment caused by development of interactive media. To investigate the interactive relationship the audience and producers, the present study reviewed the literature of interactivity and changing audience concept. Two hundred forty two producers from three broadcasting stations (KBS, MBC, and SBS) participated in the survey. All the participants were involved with producing one of the three types of program, drama, entertainment, and culture/education. The results indicated that, overall, majority of producers seem to think the opinion of audience is valuable, interesting, and influential to other audience. However, about the half of the producers agreed that the opinion of audience is trustworthy and useful and the rest of them did not. Indeed, regardless of types of genre, about the half of the producers turned out that they did not influence by the audience's opinion. Therefore, except the several examples of hit drama, it appeared that the opinion of audience did not so actively affect the production process in general. Expanding the previous anecdotal case studies, the current study attempted to study the interactivity between the audience and the producers systematically and empirically. The implications and the limitations of current research were discussed.

단부 파쇄형 휨 보강에 따른 철근콘크리트 전단벽 휨 성능 평가

조의진,김수용,배백일,최창식 대한건축학회 2020 대한건축학회논문집 Vol.36 No.4

The purpose of this study is to analyze the method of retrofitting flexural strength and the flexural performance of retrofitted shear walls. There are various ways to reinforce the flexural strength of reinforced concrete shear wall structural systems that have already been built, in the case of that, the external force is increased, and the internal force is insufficient. However, there are various problems, such as excessive flexural stiffness after reinforcement and increasing the thickness and length of the wall. We have developed a retrofit method to solve these problems. The wall end is excavated to place the required vertical rebars, and concrete is poured after placing rebars. This is the same concept as creating wall end boundary elements later on. We also studied the anchorage method of reinforcement and the interaction method between the retrofitting end and the existing wall. The flexural test results for the reinforced concrete shear wall using the studied retrofit method can be predicted according to the sectional analysis and FEM analysis, and there are differences in the plastic hinge length, crack propagation, stiffness degradation and energy dissipation due to the bending depending on the vertical rebar ratio of wall end.