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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korea Society for Simulation
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Journal DOI :
The Korea Society for Simulation
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Volume & Issues
Volume 22, Issue 4 - Dec 2013
Volume 22, Issue 3 - Sep 2013
Volume 22, Issue 2 - Jun 2013
Volume 22, Issue 1 - Mar 2013
Selecting the target year
Exploring the Stability of Predator-Prey Ecosystem in Response to Initial Population Density
Cho, Jung-Hee ; Lee, Sang-Hee ;
Journal of the Korea Society for Simulation, volume 22, issue 3, 2013, Pages 1~6
DOI : 10.9709/JKSS.2013.22.3.001
The ecosystem is the complex system consisting of various biotic and abiotic factors and the factors interact with each other in the hierarchical predator-prey relationship. Since the competitive relation spatiotemporally occurs, the initial state of population density and species distribution are likely to play an important role in the stability of the ecosystem. In the present study, we constructed a lattice model to simulate the three-trophic ecosystem (predatorprey- plant) and using the model, explored how the ecosystem stability is affected by the initial density. The size of lattice space was
, (L=100) with periodic boundary condition. The initial density of the plant was arbitrarily set as the value of 0.2. The simulation result showed that predator and prey coexist when the density of predator is less than or equal to 0.4 and the density of prey is less than or equal to 0.5. On the other hand, when the predator density is more than or equal to 0.5 and the density of prey is more than or equal to 0.6, both of predator and prey were extinct. In addition, we found that the strong nonlinearity in the interaction between species was observed in the border area between the coexistence and extinction in the species density space.
Environmental Data Management and Supply Plan for Building Synthetic Battlefield Environment of Air Combat Simulation
Yang, Ka-Ram ; Hwam, Won K. ; Park, Sang C. ;
Journal of the Korea Society for Simulation, volume 22, issue 3, 2013, Pages 7~14
DOI : 10.9709/JKSS.2013.22.3.007
In this paper, there is a research for providing environmental data to reflect environmental effects to the simulation for the aviation weapon systems by the construction of the synthetic battlefield. The results of the aviation engagement simulation are able to differ by environmental effect. This paper analyzes the real aviation battlefield and designs the synthetic battlefield based on the analysis. In order to construct the designed synthetic battlefield, we collects the real environmental data for the atmosphere and structures the collected data using GIS (Geographic information system interpolation). The main objective of this paper is to design the synthetic battlefield based on the derived environmental factors from the analysis of the real aviation battlefield, and it constructs the designed synthetic battlefield by the collection of real atmosphere data. The constructed synthetic battlefield provides the environmental data which are requested from the distributed simulation system, and it makes the system reflect environmental effects to the simulation.
Efficient Generation of Space Filling Scenarios for Computer Experiments
Yim, Dong-Soon ; Kim, Jung-Hoon ; Choi, Bong-Whan ;
Journal of the Korea Society for Simulation, volume 22, issue 3, 2013, Pages 15~23
DOI : 10.9709/JKSS.2013.22.3.015
In general, simulation models are effectively used in the field of engineering design. The experiment with simulation models to obtain optimal design parameters, however, is a time-consuming task and requires a lot of resources. Hence, meta-models representing the relationships between input variables and performance measures are exploited to efficiently determine the value of design parameters. To construct a meta-model, a number of simulation executions with sample scenarios are required. The number and quality of sample scenarios determine not only the level of efficiency in constructing the meta-model but also accuracy of the model. Space-filling condition is regarded to be an important condition for the quality of scenarios. This paper proposes sample scenario generation methods based on space-filling measures such as maxmin, Audze-Eglais, and centered L2-discrepancy. The performance of these scenario generation methods are evaluated through experiments.
A Study on Improvement of the Logistic System in Social Commerce using Simulation
Gu, Seung-Hwan ; Noh, Seung-Min ; Jang, Seong-Yong ;
Journal of the Korea Society for Simulation, volume 22, issue 3, 2013, Pages 25~33
DOI : 10.9709/JKSS.2013.22.3.025
The research focuses on the method to improve the Logistics considering investigating the present state of the fast growing social commerce. The improving Logistics is the jointed transport system, which proposes the concept of the packaged delivery for customers in same area and the condition-specific benefits as the transport cost and delay period. Customers in this system will obtain the advantage as the decrease of transport cost and social commerce companies will make the effect about growing the number of customer and the sales by the lowest price in the online markets. There are 7 scenarios for simulation. The performance assessment of the results from simulation is carried out by total number of orders, finished number of orders, sales, delivery times, delivery cost, earlier rate of delivery, and fluctuation of number of wrong delivery. The results of the research show that the total number of orders, finished number of orders and sales are increased, while the times and cost of delivery are decreased.
Bottleneck Detection Based on Duration of Active Periods
Kwon, Chi-Myung ; Lim, Sanggyu ;
Journal of the Korea Society for Simulation, volume 22, issue 3, 2013, Pages 35~41
DOI : 10.9709/JKSS.2013.22.3.035
This paper applies an active period based bottleneck detection method to flow shop manufacturing system with limited buffer size. Manufacturing systems are constrained by one or more bottlenecks which degrades the system throughput. Conventional bottleneck detection methods include the waiting time or queue length of production stations and their utilization. Due to the random events such as production time of items, machine failure and repair times, the systems may change over time, and subsequently bottlenecks shift from one station to another station. Active period of working station may cause other stations to wait for productions. Information when and where active periods occur helps to find bottlenecks in production systems. Based on these informations, we predict bottlenecks in applying AweSim simulation language. We compare the simulation results of conventional methods with those obtained from duration of active period method, and duration ratio method of both sole and shift bottleneck periods. Even though simulation results are from simple flow shop model, they are quite promising for predicting bottlenecks of production stations. We hope this study aids in decision making regarding the improving system production yield and allocation of available resources of system.
A Study on the Introduction of Outsourcing of the Delivery System for the Small Service Industry using Simulation
Gu, Seung-Hwan ; Noh, Seung-Min ; Jang, Seong-Yong ;
Journal of the Korea Society for Simulation, volume 22, issue 3, 2013, Pages 43~53
DOI : 10.9709/JKSS.2013.22.3.043
The paper addresses the introduction of outsourcing of delivery service for the small service industries such as delivery based restaurant in order to increase the profit and revenue of the service company, upgrade the delivery satisfaction for the customers, and expand the welfare of the senior people through the work. The chinese restaurants are selected as model service companies, outsourcing of delivery services are suggested for those restaurants and simulation models are developed for all operation systems for them. Some of input data for the simulation are collected from the real world and others are refined through the interview with the field workers. 6 scenarios are established considering the number of deliverers and delivery charges and simulation experiments for each scenario have been done according to the 3 kind of situations of the service companies. The results show that introduction of outsourcing increases the revenue and profit of the service company, decreases the service time for the customers and increases the revenue of the delivery outsourcing company employing the senior people. So delivery outsourcing for the service industries can be considered as a good solution for the welfare problem of the senior people.
Analysis of Relative Importance of HR practice Using Data Mining Method: Focus on Manufacturing Companies
Roh, Jin Soo ; Baek, Seung Hyun ; Jeon, Sang Gil ;
Journal of the Korea Society for Simulation, volume 22, issue 3, 2013, Pages 55~69
DOI : 10.9709/JKSS.2013.22.3.055
Managers are required to adopt and implement the human resource management practice that fit firm's strategy the most, so that optimize overall performance. However, the time and relative resources that any firm has are limited, which demands managers to understand the relative importance of all sorts of HR practice and promote them in an order of their relative importance. This study follows the universal perspective and contingency perspective(according to firm size and strategy type), try to identify the most effective HR practice on performance as well as their relative importance by "CART Ensemble" analysis. The results are as follows. From universal perspective, firms always need to high level of integration between strategy and HR department, decision making participation, autonomy of speed of working, and autonomy of way of working. Contingency perspective also suggested the importance of integration between HRM and strategy. But others are different case by case. This study suggests useful implications for managers.
Operational Scheme for Large Scale Web Server Cluster Systems
Park, Jin-Won ;
Journal of the Korea Society for Simulation, volume 22, issue 3, 2013, Pages 71~79
DOI : 10.9709/JKSS.2013.22.3.071
Web server cluster systems are widely used, where a large number of PC level servers are interconnected via network. This paper focuses on forecasting an appropriate number of web servers which can serve four different classes of user requests, simple web page viewing, knowledge query, motion picture viewing and motion picture uploading. Two ways of serving different classes of web service requests are considered, commonly used web servers and service dedicated web servers. Computer simulation experiments are performed in order to find a good way of allocating web servers among different classes of web service requests, maintaining certain levels of resource utilization and response time.
Shape Design Sensitivity Analysis Case of the Valves installed in the Hydraulic Driving Motor
Noh, Dae-Kyung ; Jang, Joo-Sup ;
Journal of the Korea Society for Simulation, volume 22, issue 3, 2013, Pages 81~87
DOI : 10.9709/JKSS.2013.22.3.081
This paper is about study how to decrese surge pressure that is occurred in excavator driving motor. We used computer simulation program SimulationX. It is also about the way finding design problem and approaching a solution through interpreting shape design sensitivity analysis. Programmes are below. First of all, finding shape fault by analyzing dynamic behavior of valves installed in hydraulic driving motor which is designed now. And drawing variable which is considered sensitive to improve dynamic efficiency among a lot of shape variables. Then, targeting that variable and examining dynamic efficiency stabilization tendency with controlling it. Finally, suggesting the most effective tuning method through variable combination as there are a lot of sensitive variables.