Byungduk Jeong - Academia.edu (original) (raw)
Related Authors
Universidade Federal do Rio de Janeiro (UFRJ)
Uploads
Papers by Byungduk Jeong
Information Systems Frontiers, 2009
Current workflow management technology offers rich support for process-oriented coordination of d... more Current workflow management technology offers rich support for process-oriented coordination of distributed teamwork. In this paper, we evaluate the performance of an industrial workflow process where similar tasks can be performed by various actors at many different locations. We analyzed a large workflow process log with state-of-the-art mining tools associated with the ProM framework. Our analysis leads to the conclusion that there is a positive effect on process performance when workflow actors are geographically close to each other. Our case study shows that the use of workflow technology in itself is not sufficient to level geographical barriers between team members and that additional measures are required for a desirable performance.
Lecture Notes in Computer Science, 2007
Information Systems Frontiers, 2009
Current workflow management technology offers rich support for process-oriented coordination of d... more Current workflow management technology offers rich support for process-oriented coordination of distributed teamwork. In this paper, we evaluate the performance of an industrial workflow process where similar tasks can be performed by various actors at many different locations. We analyzed a large workflow process log with state-of-the-art mining tools associated with the ProM framework. Our analysis leads to the conclusion that there is a positive effect on process performance when workflow actors are geographically close to each other. Our case study shows that the use of workflow technology in itself is not sufficient to level geographical barriers between team members and that additional measures are required for a desirable performance.
International Journal for Numerical Methods in Fluids, 2013
Cartesian grid with cut-cell method has drawn attention of CFD researchers owing to its simplicit... more Cartesian grid with cut-cell method has drawn attention of CFD researchers owing to its simplicity. However, it suffers from the accuracy near the boundary of objects especially when applied to viscous flow analysis. Hybrid grid consisting of Cartesian grid in the background, body-fitted layer near the object, and transition layer connecting the two is an interesting alternative. In this paper, we propose a robust method to generate hybrid grid in two-dimensional (2D) and three-dimensional (3D) space for viscous flow analysis. In the first step, body-fitted layer made of quadrangles (in 2D) or prisms (in 3D) is created near the object's boundary by extruding front nodes with a speed function depending on the minimum normal curvature obtained by quadric surface fitting. To solve global interferences effectively, a level set method is used to find candidates of colliding cells. Then, axis-aligned Cartesian grid (quadtree in 2D or octree in 3D) is filled in the rest of the domain. Finally, the gap between body-fitted layer and Cartesian grid is connected by transition layer composed of triangles (in 2D) or tetrahedrons (in 3D). Mesh in transition layer is initially generated by constrained Delaunay triangulation from sampled points based on size function and is further optimized to provide smooth connection. Our approach to automatic hybrid grid generation has been tested with many models including complex geometry and multi-body cases, showing robust results in reasonable time.
Information Systems Frontiers, 2009
Current workflow management technology offers rich support for process-oriented coordination of d... more Current workflow management technology offers rich support for process-oriented coordination of distributed teamwork. In this paper, we evaluate the performance of an industrial workflow process where similar tasks can be performed by various actors at many different locations. We analyzed a large workflow process log with state-of-the-art mining tools associated with the ProM framework. Our analysis leads to the conclusion that there is a positive effect on process performance when workflow actors are geographically close to each other. Our case study shows that the use of workflow technology in itself is not sufficient to level geographical barriers between team members and that additional measures are required for a desirable performance.
Lecture Notes in Computer Science, 2007
Information Systems Frontiers, 2009
Current workflow management technology offers rich support for process-oriented coordination of d... more Current workflow management technology offers rich support for process-oriented coordination of distributed teamwork. In this paper, we evaluate the performance of an industrial workflow process where similar tasks can be performed by various actors at many different locations. We analyzed a large workflow process log with state-of-the-art mining tools associated with the ProM framework. Our analysis leads to the conclusion that there is a positive effect on process performance when workflow actors are geographically close to each other. Our case study shows that the use of workflow technology in itself is not sufficient to level geographical barriers between team members and that additional measures are required for a desirable performance.
International Journal for Numerical Methods in Fluids, 2013
Cartesian grid with cut-cell method has drawn attention of CFD researchers owing to its simplicit... more Cartesian grid with cut-cell method has drawn attention of CFD researchers owing to its simplicity. However, it suffers from the accuracy near the boundary of objects especially when applied to viscous flow analysis. Hybrid grid consisting of Cartesian grid in the background, body-fitted layer near the object, and transition layer connecting the two is an interesting alternative. In this paper, we propose a robust method to generate hybrid grid in two-dimensional (2D) and three-dimensional (3D) space for viscous flow analysis. In the first step, body-fitted layer made of quadrangles (in 2D) or prisms (in 3D) is created near the object's boundary by extruding front nodes with a speed function depending on the minimum normal curvature obtained by quadric surface fitting. To solve global interferences effectively, a level set method is used to find candidates of colliding cells. Then, axis-aligned Cartesian grid (quadtree in 2D or octree in 3D) is filled in the rest of the domain. Finally, the gap between body-fitted layer and Cartesian grid is connected by transition layer composed of triangles (in 2D) or tetrahedrons (in 3D). Mesh in transition layer is initially generated by constrained Delaunay triangulation from sampled points based on size function and is further optimized to provide smooth connection. Our approach to automatic hybrid grid generation has been tested with many models including complex geometry and multi-body cases, showing robust results in reasonable time.