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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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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
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A Simulation Program for Protection Coordination in the Power Distribution System with Distributed Generators
Kim, Sang-Ok ; Seo, In-Yong ; Lee, Heung-Ho ; Rho, Dae-Seok ;
Journal of the Korea Society for Simulation, volume 22, issue 1, 2013, Pages 1~8
DOI : 10.9709/JKSS.2013.22.1.001
A higher penetration of renewable energy sources and adoption of renewable portfolio standard(RPS), the penetration of distributed generators(DGs) into power distribution network is becoming a threat for the safe operation of distribution network. The ground fault current of DGs can cause parasitic trip and mal-trip of protective device in the power distribution network. KEPRI has developed a simulation program for current setting of protective devices in DGs connected distribution network. In this study, we analyzed fault currents of a sample network in two cases, i.e. case 1 is for no DG connection, case 2 for a DG connection. We performed protection coordination for relays installed in the network and analyzed the contribution of a DG.
Implementation of Smartphone Adaptor for Real-Time Live Simulations
Kim, Hyun-Hwi ; Lee, Kang-Sun ;
Journal of the Korea Society for Simulation, volume 22, issue 1, 2013, Pages 9~20
DOI : 10.9709/JKSS.2013.22.1.009
Defense M&S for weapons effectiveness is a realistic way to support virtual warfare similar to real warfare. As the war paradigm becomes platform-centric to network-centric, people try to utilize smartphones as the source of sensor, and command/control data in the simulation-based weapons effectiveness analysis. However, there have been limited researches on integrating smartphones into the weapon simulators, partly due to high modeling cost - modeling cost to accomodate client-server architecture, and re-engineering cost to adapt the simulator on various devices and platforms -, lack of efficient mechanisms to exchange large amount of simulation data, and low-level of security. In this paper, we design and implement Smartphone Adaptor to utilize smartphones for the simulationbased weapons effectiveness analysis. Smartphone Adaptor automatically sends sensor information, GPS and motion data of a client's smartphone to a simulator and receives simulation results from the simulator on the server. Also, we make it possible for data to be transferred safely and quickly through JSON and SEED. Smartphone Adaptor is applied to OpenSIM (Open simulation engine for Interoperable Models) which is an integrated simulation environment for weapons effectiveness analysis, under development of our research team. In this paper, we will show Smartphone Adaptor can be used effectively in constructing a Live simulation, with an example of a chemical simulator.
Integrated Hybrid Modeling Methodology and Simulation Engine Design Based on HDEVS Formalism
Kwon, Se Jung ; Sung, Changho ; Song, Hae-Sang ; Kim, Tag Gon ;
Journal of the Korea Society for Simulation, volume 22, issue 1, 2013, Pages 21~30
DOI : 10.9709/JKSS.2013.22.1.021
A hybrid system is a combination of sub systems which have different types of state and time: a typical example is a combination of discrete event and continuous systems. A HDEVS(Hybrid DEVS) formalism was proposed for modeling and analyzing a hybrid system. The HDEVS formalism allows modelers to construct a hierarchical and modular model based on the mathematical set theory. Because the HDEVS formalism was applied to the distributed and interoperated simulators, modelers should make several heterogenous models dividing a target system. Hence, this paper proposes an extended hybrid coupled model of HDEVS formalism and an integrated hybrid modeling methodology in contrast to the existing simulation framework on interoperable simulators. By applying the proposed modeling method, a target system can be translated to a hybrid model in a similar form as the target system. This paper also contains a simulation engine design for the proposed modeling methodlogy and a case study which simulates water tank control systems.
A Simulation Analysis of R.O.K Navy's Inventory Management Model for Repairable Parts
Kim, Sungpil ; Park, Sunju ; Chung, Yerim ;
Journal of the Korea Society for Simulation, volume 22, issue 1, 2013, Pages 31~40
DOI : 10.9709/JKSS.2013.22.1.031
Recent development in science and technology has modernized the weapon systems of ROKN (Republic Of Korea Navy). Although the cost of purchasing, operating, and maintaining the cutting-edge weapon systems has been increased significantly, the national defense expenditure is under a tight budget constraint. In order to maintain the availability of ships with low cost, we need an efficient and scientific method for managing repairable parts. In this study, we propose a simulation model that computes the availability of ship's repairable parts. Our model is based on the METRIC (Multi Echelon Technique Repairable Item Control) model and extends to five sub-models to reflect the realistic situations that arise in the navy, such as planned maintenance, condemnation, lateral transshipment, and cannibalization. We have performed simulations to compute the availability of repairable parts while setting the part-level consistent throughout the five models and carried out two sensitivity analyses. The simulation results show the differences in the part availability in different models. The experiments confirm our claim that ROKN needs an inventory management system that captures the operational characteristics of the navy.
Design Methodology of System-Level Simulators for Wideband CDMA Cellular Standards
Park, Sungkyung ;
Journal of the Korea Society for Simulation, volume 22, issue 1, 2013, Pages 41~51
DOI : 10.9709/JKSS.2013.22.1.041
This tutorial paper presents the design methodology of system-level simulators targeted for code division multiple access (CDMA) cellular standards such as EV-DO (Evolution-Data Only) and broadcast multicast service (BCMCS). The basic structure and simulation flow of system-level simulators are delineated, following the procedure of cell layout, mobile drops, channel modeling, received power calculation, scheduling, packet error prediction, and traffic generation. Packet data transmissions on the forward link of CDMA systems and EV-DO BCMCS systems are considered for modeling simulators. System-level simulators for cellular standards are modeled and developed with high-level languages and utilized to evaluate and predict air interface performance metrics including capacity and coverage.
Investigation of the Force Transmission Affect by Visual Information and Previous Experience in Virtual Environment
Lee, JaeHoon ; Hwang, HoSung ; Yun, WonSik ;
Journal of the Korea Society for Simulation, volume 22, issue 1, 2013, Pages 53~61
DOI : 10.9709/JKSS.2013.22.1.053
The purpose of this paper is to examine how the humans learn and perceive the weight of objects corresponding to visual information in virtual environment. We conducted two kinds of load-on-tasks with two virtual objects that have same weight but different visual cues; have same visual cues but changed weight by trails. We found that the subject could not generate appropriate force for the smaller and changed weight objects in the beginning of the trials. the discrepancy between the expected weight and actual force consequences sue to visually invoked size and previous experience made subjects perceive the small object were heavier. one the other hand, after the tasks were repeated, the subject responded the weights were the same or very similar when the mismatch between the expected weight and the actual weight became vanished. this means that the sensorimotor feedback influences the anticipatory control scheme and weight perception aggressively in virtual environment.
School Bus Routing Problem with Mixed-Load and Dynamic Arrivals
Lee, Young-Ki ; Jeong, Suk-Jae ; Yun, Ho-Young ; Kim, Kyung-Sup ;
Journal of the Korea Society for Simulation, volume 22, issue 1, 2013, Pages 63~75
DOI : 10.9709/JKSS.2013.22.1.063
The School Bus Routing Problem(SBRP) seeks to plan an efficient schedule of a fleet of school buses that must pick up student from various bus stops and deliver them by satisfying various constraints; maximum capacity of the bus, maximum riding time of students, arrival time between a school's time window. By extending the existing SBRP, we consider a case study of SBRP with allowance of mixed-loading and dynamic arrivals reflecting the school bus operation of university in Korea. Our solution procedure is based on constructing the initial solution using sweep algorithm and then improving solution within the framework of the evolutionary approach known as efficient meta-heuristics. By comparing the various scenarios through the constraints relaxation for reflecting the real operational strategies, we assess the merit of our proposed procedure.
Fuzzy Logic-driven Virtual Machine Resource Evaluation Method for Cloud Provisioning Service
Kim, Jae-Kwon ; Lee, Jong-Sik ;
Journal of the Korea Society for Simulation, volume 22, issue 1, 2013, Pages 77~86
DOI : 10.9709/JKSS.2013.22.1.077
Cloud computing is one of the distributed computing environments and utilizes several computing resources. Cloud environment uses a virtual machine to process a requested job. To balance a workload and process a job rapidly, cloud environment uses a provisioning technique and assigns a task with a status of virtual machine. However, a scheduling method for cloud computing requires a definition of virtual machine availabilities, which have an obscure meaning. In this paper, we propose Fuzzy logic driven Virtual machine Provisioning scheduling using Resource Evaluation(FVPRE). FVPRE analyzes a state of every virtual machine and actualizes a value of resource availability. Thus FVPRE provides an efficient provisioning scheduling with a precise evaluation of resource availability. FVPRE shows a high throughput and utilization for job processing on cloud environments.
A Study on the Design Expert System for Research and Development Using Blackboard Inference Model
Jang, Seung Ho ;
Journal of the Korea Society for Simulation, volume 22, issue 1, 2013, Pages 87~95
DOI : 10.9709/JKSS.2013.22.1.087
In the research and development processes of new product, the design objects are frequently redesigned on the basis of experimental results. Most of the conventional CAD systems are based on the computer simulation to reduce the number of redesign. However, these types of CAD systems do not have the functions to infer the cause of trouble in experiments of mock-up and the redesign counterplan of new product. This paper proposes a methodology to establish the DESYR ver. 1(Design Expert SYstem for Research and development) system, which possesses the engineering model of design object in the model database, and refines the model on the basis of experimental results of the prototype. The blackboard inference model has been applied to infer the redesign counterplan. And the validity of DESYR ver. 1 system has been verified by developing the new type of magnetic bearing.