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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 20, Issue 4 - Dec 2011
Volume 20, Issue 3 - Sep 2011
Volume 20, Issue 2 - Jun 2011
Volume 20, Issue 1 - Mar 2011
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A study of Modeling and Simulation for the Availability Optimization of Cloud Computing Service
Jang, Eun-Young ; Park, Choon-Sik ;
Journal of the Korea Society for Simulation, volume 20, issue 1, 2011, Pages 1~8
DOI : 10.9709/JKSS.2011.20.1.001
Cloud computing emerges as a new paradigm for deploying, managing and offering IT resources as a service anytime, anywhere on any devices. Cloud computing data center stores many IT resources through resource integration. So cloud computing system has to be designed by technology and policy to make effective use of IT resources. In other words, cloud vendor has to provide high quality services to all user and mitigate the dissipation of IT resources. However, vendors need to predict the performance of cloud services and the use of IT resources before releasing cloud service. For solving the problem, this research presents cloud service modeling on network environment and evaluation index for availability optimization of cloud service. We also study how to optimize an amount of requested cloud service and performance of datacenter using CloudSim toolkit.
Development of Dynamic Simulator for Light Rail Transit Depot
Yang, Won-Mo ;
Journal of the Korea Society for Simulation, volume 20, issue 1, 2011, Pages 9~18
DOI : 10.9709/JKSS.2011.20.1.009
Recently, in the era of low carbon and green growth, the importance of railway transportation is being emphasized However, there is a lack of research on simulation for railway depot. This paper presents the development of the dynamic simulator for LRT(Light Rail Transit) depot. This study presents explanations of requirement analysis, architecture, database design, simulation algorithm, and design and development of the simulation tool. The dynamic LRT depot simulation tool consists of four modules; a Network Editor to create and modify information regarding railroad, train, signal, turnout, job and station, a Simulator to calculate train movement algorithm, a Reporter to show simulation results in table and graphs, and an Animator to animate simulation results dynamically. It is hoped that this study on general details of structure, design and development of LRT depot dynamic simulator will perform as a good reference to future development of new simulation tools.
Low-Latency Beacon Scheduling Algorithms for Vehicular Safety Communications
Baek, Song-Nam ; Jung, Jae-Il ; Oh, Hyun-Seo ; Lee, Joo-Yong ;
Journal of the Korea Society for Simulation, volume 20, issue 1, 2011, Pages 19~28
DOI : 10.9709/JKSS.2011.20.1.019
The safety applications based on the IEEE 802.11p, periodically transmit the safety-related information to all surrounding vehicles with high reliability and a strict timeline. However, due to the high vehicle mobility, dynamic network topology and limited network resource, the fixed beacon scheduling scheme excess delay and packet loss due to the channel contention and network congestion. With this motivation, we propose a novel beacon scheduling algorithm referred to as spatial-aware(SA) beacon scheduling based on the spatial context information, dynamically rescheduling the beaconing rate like a TDMA channel access scheme. The proposed SA beacon scheduling algorithm was evaluated using different highway traffic scenarios with both a realistic channel model and 802.11p model in our simulation. The simulation results showed that the performance of our proposed algorithm was better than the fixed scheduling in terms of throughput, channel access delay, and channel load. Also, our proposed algorithm is satisfy the requirements of vehicular safety application.
A Storage Method to Enhance Cookie File Security
Sim, Won-Tae ; Choi, Yo-Han ; Seo, Hee-Suk ; Noh, Bong-Nam ;
Journal of the Korea Society for Simulation, volume 20, issue 1, 2011, Pages 29~37
DOI : 10.9709/JKSS.2011.20.1.029
Cookie file can be properly protected by designing security zone to enhance the safety of cookie file vulnerable to cyber attacks. In this paper, the model, in which cookie file is stored in the security area and the current visiting page is closely linked with cookie, is proposed to help users utilize in the same existing way, as well as enhance the security of user cookie files. Even if attacker tries to compromise web browser's cookie folder, the security of other cookies can be preserved. It is possible since the folder has the only cookie for the current web page where user is visiting.
Password Based User Authentication Methodology Using Multi-Input on Multi-Touch Environment
Ju, Seung-Hwan ; Seo, Hee-Suk ;
Journal of the Korea Society for Simulation, volume 20, issue 1, 2011, Pages 39~49
DOI : 10.9709/JKSS.2011.20.1.039
Nowaday, Many equipments like TabletPC, Digital kiosk, ATM using touch-panel service instead of keyboard or button, to support intuitively input for user. Furthermore these days touch-panels recognize up to 5 contact points using recent technology. On this study, I Introduce password input/store methodology on multi-touch environment. On past, User must input password 1 character by 1 character, like [1, 2, 3, 4]. but, on multi-touch environment user can input more than one character at the same time, like [(1,3), 2, (3,4), (1,2,3)]. In result, users can use password more intensely. This study is utilized post security technology study on multi-touch environment.
Locomotion of Dog-like Quadruped Robots: Walk and Trot
Lim, Seung-Chul ; Kim, Kwang-Han ;
Journal of the Korea Society for Simulation, volume 20, issue 1, 2011, Pages 51~59
DOI : 10.9709/JKSS.2011.20.1.051
This paper is concerned with locomotion of dog-like quadruped robots that can adapt to various terrains, mainly dealing with implementation methods and characteristics of static and dynamic gaits. To this end, a 12-DOF robot is built in house, motional trajectories of its body and feet are generated mimicking biological life, and the corresponding leg joint angles are analytically obtained by inverse kinematics. Such joint angle data are then applied to the robot's ADAMS model for computer simulations so that the planned walk and trot gaits are both confirmed dynamically stable. However, contrary to the simulation results, previous trot patterns showed unstable behavior during experiments. This problem led us to analyze the reason, and in the course we discovered the importance of maximally utilizing the concept of WSM rather than ZMP and therefore reducing the gait period to secure the stability of dynamic gaits such as trot.
Simulation Analysis of User Grouping Algorithms for Massive Smart TV Services
Jeon, Cheol ; Lee, Kwan-Seob ; Jou, Wou-Seok ; Jeong, Tai-Kyeong Ted. ; Han, Seung-Chul ;
Journal of the Korea Society for Simulation, volume 20, issue 1, 2011, Pages 61~67
DOI : 10.9709/JKSS.2011.20.1.061
Smart TV System will lead to drastic change of communication and media industries as one of the emerging next generation network services. However, when the number of concurrent users increases rapidly, the issue of service quality degradation occurs because providing services to many users simultaneously stresses both the server and the network. The server limitation can be circumvented by deploying server clusters. but the network limitation is far less easy to cope with, due to the difficulty in determining the cause and location of congestion and in provisioning extra resources. In order to alleviate these problems, a number of schemes have been developed. Prior works mostly focus on reducing user-centric performance metrics of individual connection, such as the round-trip time(RTT), downloading time or packet loss rate, but tend to ignore the network loads caused by the concurrent connections or global network load balance. In this work, we make an in-depth investigation on the issue of user grouping for massive Smart TV services through simulations on actual Internet test-bed, PlanetLab.
A Study for Autonomous Intelligence of Computer-Generated Forces
Han, Chang-Hee ; Cho, Jun-Ho ; Lee, Sung-Ki ;
Journal of the Korea Society for Simulation, volume 20, issue 1, 2011, Pages 69~77
DOI : 10.9709/JKSS.2011.20.1.069
Modeling and Simulation(M&S) technology gets an attention from various parts such as industry and military. Especially, military uses the technology to cope with a different situation from the one in the Cold War and maximize the effect of training against the cost in the new environment. In order for the training based on M&S technology to be effective, the situations of a battlefield and a combat must be more realistically simulated. For this, a technique development on Computer-Generated Forces(CGF) which represents a unit's simulation logic and a human's simulated behaviors is focused. The CGF simulating a human's behaviors can be used in representing an enemy force, experimenting behaviors in a future war, and developing a new combat idea. This paper describes a methodology to accomplish Computer-Generated Forces' autonomous intelligence. It explains the process of applying a task behavior list based on the METT+T element onto CGFs. On the other hand, in the domain knowledge of military field manual, fuzzy facts such as "fast" and "sufficient" whose real values should be decided by domain experts can be easily found. In order to efficiently implement military simulation logics involved with such subjectivity, using a fuzzy inference methodology can be effective. In this study, a fuzzy inference methodology is also applied.
Simulation of Evacuation Dynamics of Three Types of Pedestrians with Morality
Lee, Sang-Hee ;
Journal of the Korea Society for Simulation, volume 20, issue 1, 2011, Pages 79~85
DOI : 10.9709/JKSS.2011.20.1.079
The problem of evacuating pedestrians from a room or channel under panic conditions is of obvious importance in daily life. In recent years, several computer models have been developed to simulate pedestrian dynamics. Understanding evacuation dynamics can allow for the design of more comfortable and safe pedestrian facilities. However, these models do not take into account the type and state of mind of pedestrians. They deal with pedestrians as particles and the state of mind as a social force, which is represented by conservative and long-range interactions between individuals. In this study, I used the lattice model proposed in my previous study to explore the evacuation behavior of pedestrians with morality. In this model, three types of pedestrians are considered: adults, children, and injured people. Collisions between adults and children result in injured people. When the number of injured people continuously in contact with each other reaches a given value k, the injured people are removed from the lattice space. This situation is the same as that in which pedestrians start stepping over injured people. This behavior was interpreted as the morality of pedestrians. Simulations showed that the evacuation showed down and eventually became jammed owing to the injured people acting as "obstacles" in relation to the morality k.
Design, Implementation and Performance Analysis of Event-oriented Execution Environment for DEVS
Kwon, Se-Jung ; Kim, Tag-Gon ;
Journal of the Korea Society for Simulation, volume 20, issue 1, 2011, Pages 87~96
DOI : 10.9709/JKSS.2011.20.1.087
DEVS(Discrete Event Systems Specification) is a set theoretic formalism developed for specifying discrete event system. For execution of DEVS, we need an execution environment, which consists of simulation engine and models interpreted by the simulation engine. Common existing environments use hierarchical scheduling algorithm for DEVS execution. This hierarchical scheduling is a proper algorithm for DEVS execution because of hierarchical and modular characteristics. But this algorithm has overheads owing to message passing and time management. To overcome these overheads, we apply event-oriented simulation to DEVS execution and we remove hierarchical overheads. In eventoriented simulation, the scheduling of model execution is performed by events and event list. We propose three event-oriented execution environments for DEVS and experiment about the performance of our proposed environments in comparison with the existing execution environment using the hierarchical scheduling. The experimental results show our environments works better than existing environment using the hierarchical scheduling.
Simulation Model of Dual-Species Biofilm Growth in Hydrodynamic Flow
Jeon, Won-Ju ; Lee, Sang-Hee ;
Journal of the Korea Society for Simulation, volume 20, issue 1, 2011, Pages 97~105
DOI : 10.9709/JKSS.2011.20.1.097
In rivers and streams, biofilms are thin layers of greenish-brown slime attached to rocks, plants, and other surfaces. Biofilms play key roles in primary production and cycling of nutrients, water quality remediation, suspended sediment removal, and energy flow to higher trophic levels. In the present study, we developed a two-dimensional cellular automata model to simulate mixed biofilms of toxin-sensitive and toxin-producing species in hydrodynamic flow. The flow was generated by a stochastic process for uniform flow and by using the Navier-Stokes equation for non-uniform flow. Minimized local rules governing reproduction and mortality of the species were executed in the self-organizing processes to elucidate interactions between toxin-producing and toxin-sensitive species in competition over nutrients. We briefly discuss the morphology of the simulated biofilm under different flow conditions.
Development of Femtocell Simulator Based on LTE Systems for Interference and Performance Evaluation
Kim, Chang-Seup ; Choi, Bum-Gon ; Koo, Bon-Tae ; Lee, Mi-Young ; Chung, Min-Young ;
Journal of the Korea Society for Simulation, volume 20, issue 1, 2011, Pages 107~116
DOI : 10.9709/JKSS.2011.20.1.107
Recently, femtocell has been concerned as one of effective solutions to relieve shadow region and provide high quality services to users in indoor environments. Even though femtocell offers various benefits to cellular operators and users, many technical issues, such as interference coordination, network synchronization, self-configuration, self-optimization, and so on, should be solved to deploy the femtocell in current network. In this paper, we develop a simulator for evaluating performance of long term evolution (LTE) femtocell systems under various interference scenarios. The simulator consists of a main-module and five sub-modules. The main-module connects and manages five sub-modules which have the functionality managing user mobility, packet scheduling, call admission control, traffic generation, and modulation and coding scheme (MCS). To provide user convenience, the simulator adopts graphical user interface (GUI) which can observes simulation results in real time. We expect that this simulator can contribute to developing effective femtocell systems by supporting a tool for analyzing the effect of interference between macrocell and femtocell.