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차은호,전두진,한상을,Cha, Eun-Ho,Jeon, Doo-Jin,Han, Sang-Eul 한국공간구조학회 2016 한국공간구조학회지 Vol.16 No.4
Recently damage of structures and loss of life by terrorism are internationally increasing. Among these terror that have a possibility to can happen in korea and that can caused lot of human life loss is the vehicle terror. To prevent the vehicle terror, the anti-ram barriers are needed. But domestic standard about anti-ram barriers are not clear. So, in this study, we will utilize and analyze the vehicle impact to evaluate the efficiency of the domestic bollard and suggest the installation standard of those. In Korea, granite, elastic, steel and stainless bollard are used. The performance of those bollard is not available. Elastic bollard couldn't stop the vehicle, and the others just could stop the vehicle only at the speed under 10kph. Therefore, set the variable to reinforce, and evaluate the defence efficiency of bollard. As a result, granite and elastic bollard was not suitable for the anti-ram barriers. Performance of steel bollard increased as thickness grew. So steel bollard should must be thicker than 10T. And the concrete compressive strength effected insignificantly on the defence efficiency, so more than 24MPa compressive concrete be used. Performance of stainless bollard increased as thickness grew. So stainless bollard should must be thicker than 13T.
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차은호(Eunho Cha),진영재(Youngjae Jin) 한국정당학회 2012 한국정당학회보 Vol.11 No.2
제도권 정치에 대한 불신과 불만이 강하게 표출되었던 2011년에는 희망버스, 안철수 열풍, 반값 등록금ㆍ무상급식ㆍ반 FTA 시위 등 다양한 형태의 비제도권 정치행위들이 나타났다. 특히 안철수 열풍이나 무소속 박원순 후보의 서울시장 당선과 같은 기성 정당체제를 벗어나 새로운 대안을 찾으려는 시도들은 기존 정당들에게 커다란 도전이자 위기로 인식되었다. 이러한 비제도권적 접근들이 이전과 달라진 점은 소셜미디어와 연계되어 있다는 것이었다. 나꼼수 역시 팟캐스트라는 소셜미디어를 기반으로 한 방송으로 온라인에서뿐만 아니라 오프라인에서의 집단행동으로 연결되는 여러 이슈들을 쟁점화하였다. 본 논문에서는 정치적 참여 및 집단행동으로의‘나꼼수 현상’이 나타난 동학을 규명하기위해 시민들의 인지 확산과 관련된 다양한‘소셜 데이터(social data)’에 대한‘티핑 포인트’분석을 시도하였다. 그 결과 나꼼수에 대한 일반 시민들의 인지를 높이는 데 있어서 온 ?오프라인상 언론 보도들의 상당한 영향을 확인하였다. 이는 지금까지 소셜미디어의 파급력과 영향력 형성을 독자적인 것으로 여겨졌던 것과 달리, 영향력 형성과정에 있어서 기성 언론의 매개 역할이 중요한 요인으로 작용했다는 것을 의미한다. The purpose of this study is to analyze the dynamics of newly appeared Social Media and political collective behaviors due to the dissatisfaction to institutional politics such as party politics and representative democracy, in Korea 2011. Naggomsu phenomenon as large-scale rallies or collective behavior occurred by the people who perceived Naggomsu via directly listening Podcast or knowing from neighbors, was examined in detail. With this research, we look into the process that social media’s influence such as Naggomsu was forged and diffused, and the dynamics that its influence leads political participation or collective behaviors in Korea society 2011. In order to examine each perception group, social data such as on-line comments written on the downloading page, on and off line news reports regarding Naggomsu, and the number of online fan community of Naggomsu, were analyzed with concept of tipping point. Tipping point is the moment of critical mass, the threshold, the boiling point when ideas and products and messages and collective social phenomena or behaviors suddenly spread like viruses do. This study found that pre-existing media’s report on Naggomsu played a large role in perceptual diffusion of Naggomsu among ordinary citizens.
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고훈범(Ko, Hune-Bum),차은호(Cha, Eun-Ho),오강환(Oh, Kang-Hwan) 대한건축학회 2017 大韓建築學會論文集 : 構造系 Vol.33 No.4
The pullout test certified by the American Society for Testing and Materials(ASTM) is known to be more reliable for estimating concrete strength under construction of concrete structures than other nondestructive testing(NDT) methods such as rebound number, penetration resistance, break-off, and ultrasonic pulse velocity. However, existing equipment needed for the pullout test, known as Lok test or Capo test, require several complex installation steps and expensive loading systems including load cell. We propose a simplified pullout test composed of a break-off type bolt, a standard bolt with a groove on the shaft, as an insert, an insert nut, and a pullout instrument without load cell. This simplified pullout test would be more beneficial due to its low cost, simplicity and convenience. To verify the advantages of the simplified pullout test, three wall specimens were tested with two types of concrete strength, 15MPa and 24MPa, using the Lok test, a general pullout test including load cell, and a simplified pullout test. It was found that the pullout force was very similar in comparison with compressive strength. Therefore, it was verified that the simplified pullout test can be used to replace the Lok test. The prediction equation of groove diameter with the concrete strength was derived as y=6.01x-17.17(y=concrete strength, x=the groove diameter of break-off bolt) through regression analysis. An allowable error can be easily maintained within the specified value if appropriate safety factors are studied and added to the prediction equation.
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철골 프레임의 폭발 및 연쇄붕괴해석을 위한 효율적 모델링 기법
전두진(Jeon, Doo-Jin),차은호(Cha, Eun-Ho),한상을(Han, Sang-Eul) 대한건축학회 2015 大韓建築學會論文集 : 構造系 Vol.31 No.9
The blast analysis is limited to unit members because of its long analysis time. So this paper proposes the effective modeling and simulation technique for blast and collapse analysis of steel frame. In this study, analysis for static and blast load are performed with three kinds of elements such as solid element, plate element and thick plate element. Then, the most efficient element for blast and collapse analysis is determined by comparing the reliability of the results and calculation time. Also, quasi-static is applied to the analysis that has to be carried out by the static and dynamic analysis. The analytical models are the beam(H-294x200x8x12) and column(H-200x200x8x12). As the result, a thick plate element is most efficient for blast analysis. Through this way, blast and collapse analysis are simulated with the imaginary steel frame.
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심재균(Jae Kyun Shim),차은호(Eun Ho Cha),유재욱(Jae Uck You),정재웅(Jae Woong Chung),안정호(Jung Ho Ahn) 대한전자공학회 2015 대한전자공학회 학술대회 Vol.2015 No.6
컴퓨터의 물리 자원을 가상화하는 기술은 지속적으로 연구되어 왔으며 그중에서 네트워크 가상화는 최근 다양한 네트워크 관련 서비스의 활성화로 인해 더욱 주목받고 있다. 가상 네트워크의 대역폭 및 지연시간 성능이 우수한 시스템에 대한 수요가 높아지는 가운데 본 논문은 물리 스위치를 가상 화한 OVS(Open vSwiteh)에 Intel DPDK가 적용된 시스템의 지연시간을 다양한 가상 네트워크 구성에서 측정한 다음, 성능의 가속화가 필요한 부분을 찾고 데이터센터 가상화를 위한 소프트웨어 스위치의 성능향상 방안을 제시한다.
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