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송전철탑의 내풍안전성 평가를 위한 1/2축소부분구조 실험
문병욱,민경원,Moon, Byoung-Wook,Min, Kyung-Won 한국전산구조공학회 2007 한국전산구조공학회논문집 Vol.20 No.5
본 논문에서는 풍하중에 대한 기존 송전철탑의 좌굴 및 구조적 안전성을 평가하기 위해서 축소부분구조 실험을 수행하였다. 원 송전철탑에 작용하는 중력 및 풍하중을 재현하기 위해서 1/2크기의 상사법칙을 적용한 축소모델의 상부에 설치된 삼각형태의 지그를 이용하여 가력하는 방법을 고안하였다. 설계하중에 대한 실험체의 안정성을 평가하기 위해서 예비수치 해석을 수행한 결과, 계산된 주주재의 축력은 허용좌굴하중의 $80{\sim}90%$사이에 분포하고 있음을 확인하였다. 최대허용좌굴 하중의 270%까지 가력한 결과, 주주재의 면외거동을 구속하는데 취약한 절점에서 발생한 국부좌굴로 인하여 송전철탑이 파괴되었다. 하중-변위 곡선, 변위, 부재별 변형률을 검토한 결과, 이러한 국부좌굴의 발생은 동일한 단면내에서도 휨모멘트로 인해 항복응력에 도달하는 시간이 위치별로 다르기 때문에 변형의 불균형에 의해서 발생한 부가적인 편심에 기인한 것으로 판단된다. In this paper, a half-scaled substructure test was performed to evaluate the buckling and structural safety of an existing transmission tower subjected to wind load. A loading scheme was devised to reproduce the dead and wind loads of a prototype transmission tower, which uses a triangular jig that is mounted on the reduced model to which the similarity law of a half length was applied. As a result of the preliminary numerical analysis carried out to evaluate the stability of a specimen for the design load, is was confirmed that the calculated axial forces of tower leg members were distributed to $80{\sim}90%$ of an admissible buckling load. When the substructured transmission tower was loaded by 270% of its maximum admissible buckling load, it was failed due to the local buckling that is occurred in joints with weak constraints for out-of-plane behavior of leg members. By inspection of load-displacement curves, displacements and strains of members, it is considered that this local buckling was due to additional eccentric force by unbalanced deformation because the time that is reached to yielding stress due to the bending moment is different at each point of a same section.
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고순도 PZT 분체의 저온합성법과 그 응용에 관한 연구
이경희,이병하,문병욱 明知大學校 産業技術硏究所 1986 産業技術硏究所論文集 Vol.5 No.-
Formation of powders and piezoelectric properties of Pb (Zro.52 Tio.48) O₃ by chemical methods are described. The chemical methods were accomplished at 30℃∼70℃ for 1∼24 hrs. The PZT specimens of disc shape were sintered respectively at 1100℃, 1150℃, 1200℃ and 1250℃ for 5 hrs. The optimum sintering temperature were found to be between 1200℃ and 1250℃. The dielectric constant of the sintered samples reached a maximum while the dielectric dissipation factor showed a minimum at the sintering temperature of 1200℃. The value of planar coupling coefficient, Kp was about 0.43∼0.47 at 1200℃.
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정형균,문병욱 韓國體育大學校 1998 論文集 Vol.21 No.-
The study aims to improve the handball player skills and have them physical, mental health and sound awareness by understanding the leisure perception of current handball player except for athletic time and providing related data. To achieve that goal, this study collected the sample of 300 high school students and 200 university students, general adults using the cluster sampling method. Total 500 persons was surveyed questionnaire method considering sex, school career, athletic career, and finally 361 persons were decided to be used for this study as the instrument of collection materials, this paper translated the original form of measures of leisure activities developed by witt and Ellis(1987) standardized and used it after correcting and supplementing it fit for the purpose of this study. As the analysis materials of this study, the paper used the analyses methods of technical statistics, averages, standard deviations and unitary variables. As the result of research on the handball player perception extent to leisure through the above method and procedures, this paper reached the following conclusion 1. As for the confidence and controlling power by sex, that of females was indicated a little. higher than of males, and the desire and achievement extent, those of males and females were indicated same. 2. As for the self-confidence, controlling power and achievement extent by school career, those of females were higher than those of males, as for the total perception extent to leisure, that of males was higher. 3. As for the confidence and controlling power by career, those were similar but as for the desire and achievement extent, those player below 5 years were indicate a little higher.
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Agnew의 일반긴장이론을 통한 한국 청소년의 비행 이해
문병욱,황혜원 한국아동권리학회 2006 아동과 권리 Vol.10 No.2
To study the relationship between strains and delinquency in a non-Western national context, the present study integrated information on adolescence in South Korea with prior theoretical and empirical work on general strain theory to explain delinquency. Two types of strain, examination related strain and emotional and physical abuse by teachers, which are usually ignored in studies in the United States, are included as independent variables to increase relevance to the South Korean context. Using 385 adolescents in technical and college preparatory high schools as a sample, the study found that parts of GST are very useful in explaining delinquency:(1) there is a relatively strong direct relationship between emotional and physical abuse by teachers and violence as well as property related delinquency and (2) the interaction between emotional and physical abuse by teachers and delinquent friends is strongly related to violence and property related delinquency.The findings indicate that the efficacy of teachers' use of practices defined in the study as emotional and physical abuse, even if these practices are intended to instruct youth, is highly questionable. ◈본 연구는 청소년들이 경험하는 긴장(strain)과 비행 간의 상관관계를 이해하기 위해, 기존의 일반긴장이론(General Strain Theory)의 이론적 바탕위에 한국의 청소년들이 겪는 문화적 특색을 고려하였다. 외국의 선행연구에서는 다루어지지 않았으나 한국의 상황을 반영하는 두 종류의 긴장(시험관련긴장, 교사의 폭언과 체벌)이 독립변인으로 추가되어 연구되었다.본 연구는 385명의 인문계와 실업계 고등학생들을 대상으로 실시되었으며, 연구결과에 따르면 일반긴장이론은 한국 청소년의 비행을 설명하는데 매우 유용한 것으로 나타났다. 연구결과를 요약하면 다음과 같다. 첫째, 교사의 폭언·체벌은 청소년의 폭력비행이나 재물비행과 유의미한 상관관계가 있는 것으로 나타났다. 둘째, 교사의 폭언·체벌과 불량급우와의 교제 간의 상호작용이 비행에 유의한 영향을 미치는 것으로 조사되었다. 이러한 연구결과에 따라 본 연구는 학생들을 지도하고자 하는 교사의 폭언과 체벌이 기대와 상반된 결과를 보여주며, 따라서 육체적·정서적 처벌의 효율성에 의문을 제기하였다.
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