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Simulation of high speed impact into ceramic composite systems using cohesive-law fracture model
Lee, M.,Kim, E.Y.,Yoo, Y.H. Elsevier 2008 International journal of impact engineering Vol.35 No.12
<P><B>Abstract</B></P> <P>A numerical study for the analysis of oblique metal/ceramic/metal three layer composite systems against a long-rod has been performed. The study was done using a three-dimensional dynamic program NET3D, which uses the finite element Lagrangian method with explicit time integration. To model the discrete nature for fracture and damage of brittle materials, we implemented cohesive-law fracture model with a node separation algorithm for the tensile failure and Mohr–Coulomb model for the compressive loading. A tetrahedral element implemented in the code provides more potential fracture surfaces than a hexahedral element. As a verification of the scheme, an oblique impact into the composite system was conducted and the calculated penetration depth and propagating crack paths were found to be in good agreement with experiment. Next a series of three-dimensional numerical simulations have been conduced to examine the ballistic performance of three layer composite systems. The residual velocity and residual length of the rod were computed for different plate thickness ratios of equal areal density. The impact velocities considered are 1.5, 1.8 and 2.2km/s. The oblique angle of the plate is 0° and 45°. The optimum thickness ratios of ceramic to metal are very similar to those obtained from the previous experiment.</P>
Draft Genome Sequence of Pedobacter agri PB92T, Which Belongs to the Family Sphingobacteriaceae
Lee, M.,Roh, S. W.,Lee, H.-W.,Yim, K. J.,Kim, K.-N.,Bae, J.-W.,Choi, K.-S.,Jeon, Y.-J.,Jung, W.-K.,Kang, H.,Hyun, C.-G.,Kim, D. American Society for Microbiology 2012 Journal of Bacteriology Vol.194 No.14
A genetic algorithm for PDA optimal path generation using GPS
Lee, M.,Lee, Y.K.,Rittenhouse, R.G. Elsevier Science, B.V 2012 Applied soft computing Vol.12 No.8
Many web-sites provide a variety of electronic mapping services. Currently, many studies are underway to develop vehicle navigation software for PDA maps using GPS data. Popular among these services is one that computes the optimal route between two locations input by a user. This service of computing the optimal route plays an important role in vehicular navigation and distribution and delivery industries. The calculation and manipulation of the optimal route for navigation and vehicular delivery system improve the efficiency of vehicle use and delivery times, thereby reducing costs. The purpose of this study is to compute the optimal route by considering the direction of distribution vehicles and the delivery location and develop a genetic based algorithm that quickly generates the shortest route for delivery. The algorithm also generates the optimal route for itineraries having several destinations.
Lee, M.,Ryu, Y.H.,Cho, W.G.,Jeon, T.J.,Lyoo, C.H.,Kang, Y.W.,Lee, S.J.,Kim, C.H.,Kim, D.G.,Kang, J.H.,Seo, Y.B.,Yi, C.H.,Lee, K.,Choi, T.H.,Choi, J.Y. Pergamon Press 2014 Applied radiation and isotopes Vol.94 No.-
The purpose of the present study is to investigate the relationship between dopaminergic neuron destruction and 5-HT system changes in a hemiparkinsonian rat model. We performed PET imaging studies with trans-[<SUP>18</SUP>F]Mefway in a hemiparkinsonian model of unilateral 6-hydroxydopamine (6-OHDA) rats. Region-of-interests (ROIs) were drawn in the hippocampus (HP) and cerebellum (CB). HP uptake, the ratios of specific binding to non-specific binding in the HP, and non-displaceable binding potential (BP<SUB>ND</SUB>) in the HP were compared between 6-OHDA and control rats. As a result, unilateral 6-OHDA-lesioned rats exhibited significant bilateral reduction of HP uptake and trans-[<SUP>18</SUP>F]Mefway BP<SUB>ND</SUB> compared to the intact control group. Therefore, the results demonstrate that destruction of the dopaminergic system causes the reduction of the serotonergic system.
The bond survival time variation of polymorphic amyloid fibrils in the mechanical insight
Lee, M.,Baek, I.,Chang, H.J.,Yoon, G.,Na, S. North Holland 2014 Chemical physics letters Vol.600 No.-
The structure-property relationships of biological materials such as amyloid fibrils are important to developing therapeutic strategies for amyloid-related diseases. The mechanical characterization of biological materials can provide insight into such relationships. In this study, polymorphic human islet polypeptide (hIAPP) fibrils were constructed with molecular modeling, and a constant-force bending simulation was performed to characterize the different mechanical behaviors of polymorphic hIAPP protofibrils. Our simulation results showed that, owing to their different intramolecular interactions, the fracture times of polymorphic hIAPP protofibrils depend on polymorphic structures.