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남진원 ( Nam¸ Jin Won ) 한국구조물진단유지관리공학회 2020 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.24 No.2
아치 교량 등의 행어 부재는 풍하중에 의해 진동이 발생하고 이로 인해 안전성에 영향을 미칠 수 있다. 특히, 비틀림 등으로 인해 행어에 설치된 진동 방지재가 탈락하는 경우도 발생한다. 본 연구에서는 진동방지재가 설치된 행어의 진동 특성을 파악하기 위하여 가속도계를 이용하여 고유진동수 및 진동 모드를 파악하고 이를 바탕으로 진동방지재의 기능을 검증하였다. H형강으로 제작된 행어에 대해 플랜지 부분에 대칭으로 가속도계를 설치하여 휨모드와 비틀림 모드의 진동 특성을 구분하였다. 계측된 가속도 데이터를 바탕으로 산정한 부재의 고유진동수는 내풍에 대한 목표 비틀림 진동수와 비교하여 안정성을 확인하였다.
차량탑재형 GPR을 이용한 교면포장 및 바닥판 상태평가
서진원 ( Suh¸ Jin-won ),이지영 ( Rhee¸ Ji-young ),옥창권 ( Ock¸ Chang-kwon ) 한국구조물진단유지관리공학회 2003 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.7 No.2
Concrete bridge decks, as well as asphalt pavement, are directly exposed to traffic loads and environmental conditions like rain water and deiceing chemicals causing the deteriorations and corrosion of top rebar. It difficult to detect the deterioration process by visual inspection because asphalt pavement show no sign until cavities are formed after deck deterioration. In this study, the Ground Penetrating Radar(GPR) mounted a van was tested to evaluate the condition of concrete decks as well as asphalt pavement. Test results obtained by GPR were compared with damage by the visual survey and material property of asphalt overlay. The ground penetrating radar data shows promise for producing rapid and accurate condition assessment for bridge decks.
서진원 ( Suh¸ Jin-won ),김용전 ( Kim¸ Tong-jeon ),이지영 ( Rhee¸ Ji-young ) 한국구조물진단유지관리공학회 2002 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.6 No.2
Generally, expansion joint is failed more frequently than other components during service life of the bridge. Retrofits and rehabilitations of expansion joints cause not only high maintenance cost but also intrusion to traffic. Therefore, the application of expansion joint with more superior durability, serviceability and maintenance convenience is required. For this purpose, data on failure of expansion joint installed on highway bridges from 1991 to 2000 was analysed. And visual inspection was performed.
[PB-0062] Isolation of soybean ARGONAUTE protein involved in seed coat color pigmentation
Jinwon Lee(Jinwon Lee),Gyu Tae Park(Gyu Tae Park),Hyun Jo(Hyun Jo),Jeongyun Ko(Jeongyun Ko),Junbeom Park(Junbeom Park),Jeong-Dong Lee(Jeong-Dong Lee),Jong Tae Song(Jong Tae Song) 한국육종학회 2022 한국육종학회 공동학술발표집 Vol.2022 No.-
Jinwon Park 대한조선학회 2019 International Journal of Naval Architecture and Oc Vol.11 No.1
This paper aims to assess the applicability of the Runge Kutta Discontinuous Galerkin-Direct Ghost Fluid Method to the internal explosion inside a water-filled tube, which previously was studied by many researchers in separate works. Once the explosive charge located at the inner center of the water-filled tube explodes, the tube wall is subjected to an extremely high intensity fluid loading and deformed. The deformation causes a modification of the field of fluid flow in the region near the water-structure interface so that has substantial influence on the response of the structure. To connect the structure and the fluid, valid data exchanges along the interface are essential. Classical fluid structure interaction simulations usually employ a matched meshing scheme which discretizes the fluid and structure domains using a single mesh density. The computational cost of fluid structure interaction simulations is usually governed by the structure because the size of time step may be determined by the density of structure mesh. The finer mesh density, the better solution, but more expensive computational cost. To reduce such computational cost, a non-matched meshing scheme which allows for different mesh densities is employed. The coupled numerical approach of this paper has fewer difficulties in the implementation and computation, compared to gas dynamics based approach which requires complicated analytical manipulations. It can also be applied to wider compressible, inviscid fluid flow analyses often found in underwater explosion events.
Effect of Commingled Yarn Type on the Manufacturing of Glass Fiber/Polypropylene Composite Prepreg
Jinwon Cho(조진원),Jaehyeung Park(박재형) 한국고분자학회 2021 폴리머 Vol.45 No.3
본 연구에서는 다른 방식의 커밍글 얀(commingled yarn)과 제직방법을 이용하여 유리섬유와 폴리프로필렌 복합 프리프레그를 제조하고 그 구조 특성과 성질에 대해 살펴보았다. 복합 프레프레그 제조를 위하여 covering 방식과 air textured 방식으로 제조된 두 종류의 커밍글 얀을 이용하여, 평직과 능직으로 직조하였다. 프리프레그 제작 시 커밍글얀 방식과 직조방법에 따라 유리 섬유의 배열이 불규칙적으로 이동됨을 확인하였고, 이는 열가소성 수지인 폴리프로필렌의 높은 점도에 기인한 것이다. 직조된 유리섬유 패턴의 변형은 프리프레그의 기계적 물성에 큰 영향을 미치는 것을 확인하였다. 본 연구에서 확인된 결과들은 향후 하이브리드 섬유를 이용한 프리프레그 개발 시 공정을 설계하는데 도움이 될 것으로 기대된다. Glass fiber/polypropylene (GF/PP) composite prepregs were produced using different types of commingled yarns with different weave patterns. The commingled yarn used in this study was prepared using covering and air textured methods and the prepared commingled yarns were woven into two different weave patterns, plain and twill. The results show the effect of the commingling method and weave pattern on impregnation and alignment of GF in the composite prepregs due to the flow of the highly viscous molten PP resins. The mechanical properties (tensile strength, puncture impact properties, and Izod pendulum impact resistance) of the prepared composite prepregs were also evaluated. The results of this study show that the best tensile and impact resistance properties of composite prepreg is achieved using fabrics with a twill weave pattern made from air textured yarn (ATY) commingled yarns, which ensures the uniformity and alignments of the GF yarns in the composite.