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RISS 인기검색어
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- 저자 : Esim, Emir (검색결과 3 건)
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E.-S. Im,F. Giorgi,J.-B. Ahn,K-H. Chang,Y.-J. Choi 한국기상학회 2010 한국기상학회 학술대회 논문집 Vol.2010 No.10
This study investigates the elevation dependency of the present-day climate and future climate change in temperature and hydrological variables over two target regions such as Alps and Korea. The ECHAM5/MPI-OM (1.875 degree) A1B scenario simulation has been dynamically downscaled by using two different approaches within the framework of RegCM3 modeling system. First, mosaic-type parameterization of subgrid-scale topography and land use (Sub-BATS) is applied over the European Alpine region. The Sub-BATS system is composed of 15 ㎞ coarse-grid cell and 3 ㎞ sub-grid cell. Second, we developed the RegCM3 one-way double-nested system, with the mother domain encompassing the eastern regions of Asia at 60 ㎞ grid spacing and the nested domain covering the Korean Peninsula at 20 ㎞ grid spacing. Both downscaled fine-scale climate simulation over Alps (3 ㎞) and Korea (20㎞) shows reasonable agreement with station-based observations. The simulations exactly capture the strong relationship between the elevation and local climatology as seen in observed temperature and precipitation patterns. The behavior of the elevation dependency shown by the present-day climate simulation is also appeared in the climate change signal. The warming amplifications are highly correlated with elevation. The warming over Korea is more pronounced at higher elevations than at lower elevations during winter, and maximum warming occurs at minimum temperature, showing an asymmetric response between minimum and maximum temperature. A noticeable differential rate of winter warming in response to the elevation can be explained by the snow-albedo feedback. Precipitation, snow and runoff changes also show the relevant topographical modulation under global warming. This study clearly demonstrates the importance of a refined topography for improving the accuracy of the local climatology and suitably reflecting the altitudinal distribution.
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Er, Ozgur,Kilic, Kerem,Esim, Emir,Aslan, Tugrul,Kilinc, Halil Ibrahim,Yildirim, Sahin The Korean Academy of Prosthodonitics 2013 The Journal of Advanced Prosthodontics Vol.5 No.4
PURPOSE. The aim of the present study was to evaluate the effects of posts with different morphologies on stress distribution in an endodontically treated mandibular premolar by using finite element models (FEMs). MATERIALS AND METHODS. A mandibular premolar was modeled using the ANSYS software program. Two models were created to represent circular and oval fiber posts in this tooth model. An oblique force of 300 N was applied at an angle of $45^{\circ}$ to the occlusal plane and oriented toward the buccal side. von Mises stress was measured in three regions each for oval and circular fiber posts. RESULTS. FEM analysis showed that the von Mises stress of the circular fiber post (426.81 MPa) was greater than that of the oval fiber post (346.34 MPa). The maximum distribution of von Mises stress was in the luting agent in both groups. Additionally, von Mises stresses accumulated in the coronal third of root dentin, close to the post space in both groups. CONCLUSION. Oval fiber posts are preferable to circular fiber posts in oval-shaped canals given the stress distribution at the postdentin interface.
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Halil Ibrahim Kilin,Tugrul Aslan,Sahin Yildirim,Emir Esim,Ozgur Er,Kerem Kili 대한치과보철학회 2013 The Journal of Advanced Prosthodontics Vol.5 No.4
PURPOSE The aim of the present study was to evaluate the effects of posts with different morphologies on stress distribution in an endodontically treated mandibular premolar by using finite element models (FEMs). MATERIALS AND METHODS A mandibular premolar was modeled using the ANSYS software program. Two models were created to represent circular and oval fiber posts in this tooth model. An oblique force of 300 N was applied at an angle of 45° to the occlusal plane and oriented toward the buccal side. von Mises stress was measured in three regions each for oval and circular fiber posts. RESULTS FEM analysis showed that the von Mises stress of the circular fiber post (426.81 MPa) was greater than that of the oval fiber post (346.34 MPa). The maximum distribution of von Mises stress was in the luting agent in both groups. Additionally, von Mises stresses accumulated in the coronal third of root dentin, close to the post space in both groups. CONCLUSION Oval fiber posts are preferable to circular fiber posts in oval-shaped canals given the stress distribution at the post-dentin interface.
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