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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 24, Issue 4 - Dec 2015
Volume 24, Issue 3 - Sep 2015
Volume 24, Issue 2 - Jun 2015
Volume 24, Issue 1 - Mar 2015
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Study of Acquiring the Credibility for Weapon System M&S with V&V Process
Kim, Seok-Woo ; Park, Sanghyuk ;
Journal of the Korea Society for Simulation, volume 24, issue 3, 2015, Pages 1~8
DOI : 10.9709/JKSS.2015.24.3.001
Verification, Validation & Accreditation (VV&A) process is widely applied in various disciplines as a method of acquiring the credibility for M&S tools. The guideline of VV&A states that the detailed process can be established flexibly according to the needs and the availability of resources. For example, DAPA (Defense Acquisition Program Administration) guideline suggests that the accreditation process in the VV&A can be omitted if necessary. On this study, we first introduce and describe V&V process. Accreditation process is omitted due to limited time and resources. However, the proposed V&V is sufficient for our needs. Finally, we apply the proposed process of V&V to the System-Integrated Simulator of "Raybolt", Medium-Range Infantry Missile System, for the acquisition of the M&S credibility.
Analysis of the Flight Trajectory Characteristics of North Korea SLBM
Lee, Kyoung-Haing ; Seo, Hyeong-Pil ; Kwon, Yong-Soo ; Kim, Jiwon ;
Journal of the Korea Society for Simulation, volume 24, issue 3, 2015, Pages 9~16
DOI : 10.9709/JKSS.2015.24.3.009
This research focuses on analysis of the flight trajectory characteristics of SLBM (Submarine Launched Ballistic Missile) of North Korea. Recently, North Korea tested launching of SLBM which is threatening international security. Also it is known that North Korea had possessed the technologies about SLBM since they disassembled submarines out of commission of the former Soviet Union. If the development of the SLBM of North Korea is completed, it should be affected as asymmetric threat to South Korea. Therefore, for active respondence to these threat, it is essential to analyze the SLBM systematically. In this point of view, this work made a SLBM flight model and simulated. In addition, we controled flight trajectories according to adjusting loft angle and described their characteristics. The sea-based ballistic missile defense system is required for an effective response to the flight trajectory of the SLBM from mid-course to terminal phase.
Scheduling Start-up Transient Periods of Dual Armed Cluster Tools
Hong, Kyeung-Hyo ; Kim, Ja-Hee ;
Journal of the Korea Society for Simulation, volume 24, issue 3, 2015, Pages 17~26
DOI : 10.9709/JKSS.2015.24.3.017
A cluster tool used in many kinds of semiconductor processes for improving the performance and the quality of wafers has a simple configuration, but its schedule is not easy because of its parallel processing module, a lack of intermediate buffers, and time constraints. While there have been many studies on its schedule, most of them have focused on full cycles in which identical work cycles are repeated under constant task times. In this research, we suggest strategies of start-up transient scheduling which satisfies time constraints and converges into a desirable steady schedule for full work cycle. The proposed schedules are expected robust under the stationary stochastic task times. Finally, we show that the strategies make schedules enters the desirable steady schedule and robust using the simulation.
Analysis of an M/G/1/K Queueing System with Queue-Length Dependent Service and Arrival Rates
Choi, Doo-Il ; Lim, Dae-Eun ;
Journal of the Korea Society for Simulation, volume 24, issue 3, 2015, Pages 27~35
DOI : 10.9709/JKSS.2015.24.3.027
We analyze an M/G/1/K queueing system with queue-length dependent service and arrival rates. There are a single server and a buffer with finite capacity K including a customer in service. The customers are served by a first-come-first-service basis. We put two thresholds
) on the buffer. If the queue length at the service initiation epoch is less than the threshold
, the service time of customers follows
with a mean of
and the arrival of customers follows a Poisson process with a rate of
. When the queue length at the service initiation epoch is equal to or greater than
and less than
, the service time is changed to
with a mean of
. The arrival rate is still
. Finally, if the queue length at the service initiation epoch is greater than
, the arrival rate of customers are also changed to a value of
and the mean of the service times is
. By using the embedded Markov chain method, we derive queue length distribution at departure epochs. We also obtain the queue length distribution at an arbitrary time by the supplementary variable method. Finally, performance measures such as loss probability and mean waiting time are presented.
Optimal Server Allocation to Parallel Queueing Systems by Computer Simulation
Park, Jin-Won ;
Journal of the Korea Society for Simulation, volume 24, issue 3, 2015, Pages 37~44
DOI : 10.9709/JKSS.2015.24.3.037
A queueing system with 2 parallel workstations is common in the field. Typically, the workstations have different features in terms of the inter arrival times of customers and the service times for the customers. Computer simulation study on the optimal server allocation for parallel heterogeneous queueing systems with fixed number of identical servers is presented in this paper. The queueing system is optimized with respect to minimizing the weighted system time of the customers served by 2 parallel workstations. The system time formula for the M/M/c systems in Kendall's notation is known. Thus, we first compute the optimal allocation for parallel M/M/c systems, comparing the results with those from the computer simulation experiments, and have the same results. The CETI rule is devised through optimizing M/M/c cases, which allocates the servers based on Close or Equal Traffic Intensities between workstations. Traffic intensity is defined as the arrival rate divided by the service rate times the number of servers. The CETI rule is shown to work for M/G/c, G/M/c queueing systems by numerous computer simulation experiments, even if the rule cannot be proven analytically. However, the CETI rule is shown not to work for some of G/G/c systems.
The Utilization of Frequency Response Characteristic for the Detection of Change of Backlash Magnitude
Baek, Joo-Hyun ;
Journal of the Korea Society for Simulation, volume 24, issue 3, 2015, Pages 45~54
DOI : 10.9709/JKSS.2015.24.3.045
This paper presents the influence of backlash can be greatly increased on the frequency response characteristic which is presented as the angular velocity of a motor to the motor input voltage, if the motor input voltage is adequately reduced. And, this paper verifies theoretically, analytically and experimentally the availability on the method of detecting the change of backlash magnitude by investigating on the change of the anti-resonance and resonance frequencies in the frequency response characteristic due to the change of backlash magnitude. The amount of change of anti-resonance frequency is more useful that of resonance frequency when detecting the change of backlash magnitude, because the change of anti-resonance frequency can be measured more stable. This paper also shows the sharp change of resonance frequency can be investigated when the motor input voltage is enough reduced. The work will be useful for the further research on the backlash estimation method of a servo system with a gear reducer.
RUP Model Based SBA Effectiveness Analysis by Considering the V Process and Defense Simulation Hierarchy
Cha, HyunJu ; Kim, Hyung Jong ; Lee, Hae Young ;
Journal of the Korea Society for Simulation, volume 24, issue 3, 2015, Pages 55~60
DOI : 10.9709/JKSS.2015.24.3.055
This paper presents an SBA (simulation-based acquisition) effectiveness analysis environment using the RUP (Relational Unified Process) model. The RUP model has 4 phases which cover the whole development steps such as requirement analysis, design, development and test. By applying the RUP model, SW development can be represented with the iterations of developments for each phase. Such a characteristics of the model would make the model suitable for defense acquisition. In this paper, we show the relation between the RUP model and V process model, which is the foundation for defense acquisition. In order to show how the model could be applied to SBA effectiveness analysis, graphical user interfaces for the analysis are presented at the end of the paper.
Cross-layer Simulation and Analysis for Video Transmission Quality in MANET
Yoon, Hyoup-Sang ;
Journal of the Korea Society for Simulation, volume 24, issue 3, 2015, Pages 61~68
DOI : 10.9709/JKSS.2015.24.3.061
Mobile ad hoc networks (MANETs) are self-organized dynamic networks populated by mobile nodes. This paper presents the improved cross-layer approach to complement the recent works for video transmission services on MANET. We use a statistical design of experiment and analysis in order to investigate interactions between major factors of each layer effectively with minimizing ns-3 simulation run time. The proposed cross-layer approach considers MANET protocol layers (i.e., physical, network and transmission layers) and an application layer (i.e., a video encoder) as factors simultaneously. In addition, the approach defines an objective video quality metric as a response variable. The result of this paper can be applicable as a preliminary research to design an optimized video transmission application which has ability to adjust controllable factors to dynamic uncontrollable factors.
Structural Analysis of the Lower Frame in the Multi-aerial Platform
Kang, Sung-Soo ;
Journal of the Korea Society for Simulation, volume 24, issue 3, 2015, Pages 69~75
DOI : 10.9709/JKSS.2015.24.3.069
This research focuses on structural stability of the multi-aerial platform. In this study, we conduct structural analysis for the lower structures such as sub frame, out-trigger and chassis frame, by using a universal structural analysis program NASTRAN based on 3D CAD data, material properties, load conditions and boundary conditions. We confirm the position of local stress exceeding the yield strength, through structural analysis of 4 cases for load conditions. As the results, it is possible to relax stress concentration in a way such as changing the thickness, reinforcing the material of the lower frames.
A Layered Protection System for a Cloud Storage of Defense M&S Resources
Park, Chanjong ; Han, Seungchul ; Lee, Kangsun ;
Journal of the Korea Society for Simulation, volume 24, issue 3, 2015, Pages 77~87
DOI : 10.9709/JKSS.2015.24.3.077
Defense M&S (Modeling & Simulation) is utilized as a realistic method to analyze MOE (Measure of Effectiveness) of weapon systems by modeling weapons and their operational environment on the computer, and simulating them under various war scenarios. As weapon systems become complex in their structure and dynamics, model engineering are experiencing difficulties to construct simulation models on a computer. A model repository helps model developers to save model development time and cost by systematically storing predefined and already validated models. However, most repositories for Defense M&Shave not been successful partly due to limited accessability, vulnerability to security threats, and low level of dependability. In this paper, we propose W-Cloud (Weapon Cloud), a cloud model repository for reusing predefined weapon models. Clients can access W-Cloud on any platforms and various devices, yet security and confidentiality concerns are guaranteed by employing multi-tier information protection mechanism.
A Study on Simple Methodology of Distruction Effects Analysis 3 Dimensional Building Target's by Weapon Systems
Park, Jinho ; Choi, Sangyeong ; Kim, Yeongho ;
Journal of the Korea Society for Simulation, volume 24, issue 3, 2015, Pages 89~96
DOI : 10.9709/JKSS.2015.24.3.089
In order to use missiles more effectively, assessing methodologies was advanced about weapon effects for various target types. We tried to find out the most effective analysis methodologies for missiles to attack 3 dimensional building target's and analyzed adaptedness as an assessing methodology. There are EFD (Expected Fractional Damage) and SSPD (Single Sortie Probability of Damage) methodologies to assess building target damage. In order to calculate effectiveness we used input parameter such as size of the target and CEP (Circular Error Probable), MAE_bldg (Mean Area of Effects for Building) of weapons and impact angle as encountering condition between the target and the missile. We compared EFD and SSPD, in order to analyze adaptedness as a effective methodology by CEP and MAE. The result was that EFD methodology was more adaptive to assess 3 dimensional building targets by missile systems than SSPD.
Simulation-based Analysis of Electric Power Consumption Efficiency for Self-Driving Roller Conveyor Systems
Kim, Young J. ; Park, Hee N. ; HAM, Won K. ; Park, Sang C. ;
Journal of the Korea Society for Simulation, volume 24, issue 3, 2015, Pages 97~105
DOI : 10.9709/JKSS.2015.24.3.097
This paper is to analyze the efficiency of power consumption in logistic systems that are based on self-driving roller conveyors by the simulation technology. The improvement of the efficiency brings advantages for reducing greenhouse gas emission and logistics costs. A self-driving roller conveyor is operated only when products are loaded on itself. Thus, the self-driving roller conveyor systems consume less electric power than continuous-driving roller conveyor systems. In this paper, we design a DEVS (Discrete-Event based System) based simulation model and construct self-driving roller and continuous-driving roller conveyor models. For the verification and validation of the designed simulation system and conveyor models, we model a corresponding logistic model for the experimental environment and compare between the model and a real system. The main objective of this paper is to describe the power consumption advantage of self-driving roller conveyor based logistic systems using a simulation method.