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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Korean Journal of Computational Design and Engineering
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Journal DOI :
Society of CAD/CAM Engineers
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Volume & Issues
Volume 18, Issue 6 - Dec 2013
Volume 18, Issue 5 - Oct 2013
Volume 18, Issue 4 - Aug 2013
Volume 18, Issue 3 - Jun 2013
Volume 18, Issue 2 - Apr 2013
Volume 18, Issue 1 - Feb 2013
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Analytical Osteotomy Model for Three-dimensional Surgical Planning of Opening Wedge High Tibial Osteotomy
Koo, Bon-Yeol ; Park, Byoung-Keon ; Choi, Dong-Kwon ; Kim, Jay-Jung ;
Korean Journal of Computational Design and Engineering, volume 18, issue 6, 2013, Pages 385~398
DOI : 10.7315/CADCAM.2013.385
Opening wedge high tibial osteotomy (OWHTO) is widely used to treat unicompartmental osteoarthritis of the knee caused by degenerative deformations of the anatomical axes of the leg. However, since it is difficult to accurately plan the surgical degrees of adjustment such as coronal correction angle and tibial posterior slope angle to align the axes before the actual procedure, a number of studies have proposed analytical models to solve this problem. While previous analytical models for OWHTO were limited to specific cases, this study proposes an analytical osteotomy model (AOM) and a surgical planning system (SPS) that are suitable for a wide range of tibial morphologies and tibia conditions. The validity and generality of the model were verified in a total of 60 OWHTO cases. Results of the test showed that, as predicted, surgical degrees are affected quite significantly by tibia shape and slope of the resected surface. Comparison of the required surgical degrees and the degrees estimated from virtual surgery simulations using AOM showed a very small average difference of
. SPS, based on AOM, allows the operating surgeon to easily calculate surgical parameters needed to treat a patient.
GPU-accelerated Lattice Boltzmann Simulation for the Prediction of Oil Slick Movement in Ocean Environment
Ha, Sol ; Ku, Namkug ; Roh, Myung-Il ;
Korean Journal of Computational Design and Engineering, volume 18, issue 6, 2013, Pages 399~406
DOI : 10.7315/CADCAM.2013.399
This paper describes a new simulation technique for advection-diffusion phenomena over the sea surface using the lattice Boltzmann method (LBM), capable of predicting oil dispersion from tankers. The LBM is used to solve the pollutant transport problem within the framework of the ocean environment. The sea space is represented by the lattices, where each lattice has the information on oil transportation. Since dispersed oils (i.e., oil droplets) at sea are transported by convection due to waves, buoyancy, and turbulent diffusion, the conservation of mass and many physical oil transport rules were used in the prediction model. Since the LBM is modeled using the uniform lattices and simple rules, it can be easily accelerated by the parallel mechanism, for example, GPU-accelerated method. The proposed model using the LBM is used to simulate a simple pollution event with the oil pollutants of 10,000 kL. The simulation results indicate that the LBM method accelerated with the GPU is 6 times faster than that without the GPU.
Database Modeling for Pre-qualification Management System
Do, Namchul ; Park, JongJin ; Lee, Jeongyoul ; Lee, Jae Hyun ;
Korean Journal of Computational Design and Engineering, volume 18, issue 6, 2013, Pages 407~416
DOI : 10.7315/CADCAM.2013.407
Acting an important risk management tool for main contractors, pre-qualification has served a key marketing tool for subcontractors in various industries. Current industrial environment has required the time intensive pre-qualification ability to small and medium-size subcontractors as a matter of competitive business. In order to support the subcontractors, this paper proposes a database model for pre-qualification management system (PQMS) that automates the pre-qualification process by using information technologies. The modeling process consists of specifications for its requirements, functional modules, and a database model for the PQMS.
Development of Automatic Selection of Assembly Direction and Assembly Sequence Correction System
Park, Hong-Seok ; Park, Jin-Woo ;
Korean Journal of Computational Design and Engineering, volume 18, issue 6, 2013, Pages 417~427
DOI : 10.7315/CADCAM.2013.417
Assembly direction is used in order to confirm the generated assembly sequences in an automatic assembly sequence planning system. Moreover, assembly sequence planners can ascertain the feasibility of a sequence during simulation with assembly direction based in a CAD environment. In other words, assembly direction is essential for sequence optimizing and automatic generation. Based on the importance of assembly direction, this paper proposes a method to select the best direction for the generated assembly sequence using disassembly simulation and geometrical common area between assembled parts. Simultaneously, this idea can be applied to verify the generated assembly sequence. In this paper, the automatic selection of assembly direction and sequence correction system is designed and implemented. The developed algorithms and the implemented system are verified based on case study in the CAD environment.
Multi-View Supporting VR/AR Visualization System for Supercomputing-based Engineering Analysis Services
Seo, Dong Woo ; Lee, Jae Yeol ; Lee, Sang Min ; Kim, Jae Seong ; Park, Hyung Wook ;
Korean Journal of Computational Design and Engineering, volume 18, issue 6, 2013, Pages 428~438
DOI : 10.7315/CADCAM.2013.428
The requirement for high performance visualization of engineering analysis of digital products is increasing since the size of the current analysis problems is more and more complex, which needs high-performance codes as well as high performance computing systems. On the other hand, different companies or customers do not have all the facilities or have difficulties in accessing those computing resources. In this paper, we present a multi-view supporting VR/AR system for providing supercomputing-based engineering analysis services. The proposed system is designed to provide different views supporting VR/AR visualization services depending on the requirement of the customers. It provides a sophisticated VR rendering directly dependent on a supercomputing resource as well as a remotely accessible AR visualization. By providing multi-view centric analysis services, the proposed system can be more easily applied to various customers requiring different levels of high performance computing resources. We will show the scalability and vision of the proposed approach by demonstrating illustrative examples with different levels of complexity.
Layout Method of a Floating Offshore Structure Using the Optimization Technique
Jeong, Se-Yong ; Roh, Myung-Il ; Shin, Hyun-Kyoung ; Ha, Sol ; Ku, Nam-Kug ;
Korean Journal of Computational Design and Engineering, volume 18, issue 6, 2013, Pages 439~450
DOI : 10.7315/CADCAM.2013.439
In the case of a floating offshore structure such as FPSO(Floating, Production, Storage, and Offloading unit), many equipment should be installed in the limited space, as compared with an onshore structure. Recently, the requirement for an optimal layout method of the structure has been raised. Thus, a layout method of the floating offshore structure was proposed in this study. First, an optimization problem for layout design was mathematically formulated, and then an optimization algorithm was implemented based on the genetic algorithm in order to solve it. To evaluate the applicability of the proposed method, it was applied to examples ofFPSO topsides and an offshore wind turbine. As a result, it was shown that the proposed method can be applied to layout design of the floating offshore structure.
A Monitoring System of Energy Usage for Apartment Houses Using Smart TV
Park, Sungsoo ; Jin, Younghoon ; Nam, Sanghun ; Chai, Youngho ;
Korean Journal of Computational Design and Engineering, volume 18, issue 6, 2013, Pages 451~460
DOI : 10.7315/CADCAM.2013.451
Adaptive Mesh Refinement for Dealing with Shock Wave Analysis
Jun, Yongtae ; Lee, Minhyung ;
Korean Journal of Computational Design and Engineering, volume 18, issue 6, 2013, Pages 461~469
DOI : 10.7315/CADCAM.2013.461
Computer simulation with FEM is very useful to analyze hypervelocity impact phenomena that are tremendously expensive or otherwise too impractical to analyze experimentally. Shock physics can be efficiently handled by mesh adaptation which allows finite element mesh to be locally optimized to resolve moving shock wave in explosion. In this paper, an adaptive meshing technique based upon quadtree data structure was applied to resolve ballistic impact phenomena. The technique can adaptively refine a mesh in the neighborhood of a shock and coarsen the mesh for the smooth flow behind the shock according to a criterion. The criterion for refinement and coarsening is based upon the standard deviation of the gradient of shock pressure on the associated field. Shock simulation starts with the rough mesh of the pressure field and mesh density is increased locally under the criterion at each time step. The results show that the mesh adaptation enables to minimize the global computation error of FEM and to increase storage and computational saving compared to the fixed resolution of the conventional static mesh approach.