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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korea Society for Simulation
Journal Basic Information
Journal DOI :
The Korea Society for Simulation
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Volume & Issues
Volume 11, Issue 4 - Dec 2002
Volume 11, Issue 3 - Sep 2002
Volume 11, Issue 2 - Jun 2002
Volume 11, Issue 1 - Mar 2002
Selecting the target year
Experimental Design for Port Investment Analysis : A Case Study in a Bulk Terminal
Chang, Young-Tae ;
Journal of the Korea Society for Simulation, volume 11, issue 3, 2002, Pages 1~12
Experimental design in simulation provides an efficient way of economizing simulation runs since a considerable number of simulation runs that originally were planned can be reduced by this approach. This experimental design method is an active area of research together with the output analysis and so no single panacea seems to exist so far. Thus, selection of techniques of experimental design and output analysis more likely depends upon the objective of simulation analysis, budget constraint and sometimes the analyst's subjective judgment. This paper attempts to describe an experimental design methodology for port investment analysis using a case study in a bulk terminal in Korea. Detailed display will be focused on simulation period, warm-up period, the number of replications needed in production runs after brief explanation on the system configuration.
Automated FEA Simulation of Micro Motor
Lee Joon-Seong ;
Journal of the Korea Society for Simulation, volume 11, issue 3, 2002, Pages 13~22
This paper describes an automated evaluation of electrostatic field for micro motors whose sizes range 10 to 103um. Electric field modeling in micro motors has been generally restricted to in-plane two-dimensional finite element analysis (FEA). In this paper, the actual three-dimensional geometry of the micro motor is considered. An automatic FE mesh generation technique, which is based on the fuzzy knowledge processing and computational geometry techniques, is incorporated in the system, together with one of commercial FE analysis codes and one of commercial solid modelers. The system allows a geometry model of concern to be automatically converted to different FE models, depending on physical phenomena to be analyzed, electrostatic analysis and stress analysis and so on. The FE models are then exported to the FE analysis code, and then analyses are peformed. Then, analytical analysis and FE analysis about the torque generated by electrostatic micro motor are performed. The starting torque is proportional to
, the calculated starting torque from the two-dimensional analytical solutions are three times larger than those from the three-dimensional FE solutions.
Quick Semi-Buddy Scheme for Dynamic Storage Allocation in Real-Time Systems
Journal of the Korea Society for Simulation, volume 11, issue 3, 2002, Pages 23~34
Dynamic storage allocation (DSA) is a field fairly well studied for a long time as a basic problem of system software area. Due to memory fragmentation problem of DSA and its unpredictable worst case execution time, real-time system designers have believed that DSA may not be promising for real-time application service. Recently, the need for an efficient DSA algorithm is widely discussed and the algorithm is considered to be very important in the real-time system. This paper proposes an efficient DSA algorithm called QSB (quick semi-buddy) which is designed to be suitable for real-time environment. QSB scheme effectively maintains free lists based on quick-fit approach to quickly accommodate small and frequent memory requests, and the other free lists devised with adaptation upon a typical binary buddy mechanism for bigger requests in harmony for the .improved performance. Comprehensive simulation results show that the proposed scheme outperforms QHF which is known to be effective in terms of memory fragmentation up to about 16%. Furthermore, the memory allocation failure ratio is significantly decreased and the worst case execution time is predictable.
Deriving TrueType Features for Letter Recognition in Word Images
SeongAh CHIN ;
Journal of the Korea Society for Simulation, volume 11, issue 3, 2002, Pages 35~48
In the work presented here, we describe a method to extract TrueType features for supporting letter recognition. Even if variously existing document processing techniques have been challenged, almost few methods are capable of recognize a letter associated with its TrueType features supporting OCR free, which boost up fast processing time for image text retrieval. By reviewing the mechanism generating digital fonts and birth of TrueType, we realize that each TrueType is drawn by its contour of the glyph table. Hence, we are capable of deriving the segment with density for a letter with a specific TrueType, defined by the number of occurrence over a segment width. A certain number of occurrence appears frequently often due to the fixed segment width. We utilize letter recognition by comparing TrueType feature library of a letter with that from input word images. Experiments have been carried out to justify robustness of the proposed method showing acceptable results.
Redundancy Analysis Simulation for EDS Process
Journal of the Korea Society for Simulation, volume 11, issue 3, 2002, Pages 49~58
It takes 2 or 3 months to manufacture memory device. Defect has to exist owing to hundreds of processes. If there are too many defects, the memory has to be rejected. But if there are a few defects, it will be more efficient and cost reducing for the company to use it by repairing. Therefore, laser-repair process is needed for such a reason and redundancy analysis is needed to establish correct target of laser-repair process. The equipment development company had provided the redundancy analysis and each development company had developed and provided separately. So, to analyze the similar type of defects, redundancy analysis time can be very different by the manufacture. The purpose of this research is to strengthen the competitive price and to apply correlation concept in business for reducing the redundancy analysis time to repair the defects
Conveyor Capability Simulation for Semiconductor Diffusion Area
Journal of the Korea Society for Simulation, volume 11, issue 3, 2002, Pages 59~65
Semiconductor wafer fabrication is a business of high capital investment and fast changing nature. To be competitive, the production in a fab needs to be effectively planned and scheduled starting from the ramping up phase, so that the business goals such as on-time delivery, high output volume and effective use of capital intensive equipment can be achieved. Project executed that use conveyor in bay semiconductor A line. But conveyor capability is lacking and rundown happened in equipment. Do design without normal simulation and conveyor system failed. The comparison is peformed through simulation using .AutoMod a window 98 based discrete system simulation software, as a tool for comparing performance of proposed layouts. In this research estimate optimum conveyor capability, there is the purpose.
A Simulation Study on the Number of Operators of Automobile Relay Switch Production
Journal of the Korea Society for Simulation, volume 11, issue 3, 2002, Pages 67~77
In this paper, a production process system simulation of the automobile relay switch manufacturing factory is studied. The status of the present production system is inspected first, and the modified model is simulated next. To inspect the effect of the process parameter change, a simulation program is developed using PROMODEL simulation software plus the EXCEL VBA and Active X Automation function. Using the developed simulation program, user can find the best production condition and alternatives on the production capacity, number of workers, and inspection status considering the defective ratio of the product. The feasibility of the new alternatives is compared with the present system using statistical method.