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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 19, Issue 4 - Dec 2010
Volume 19, Issue 3 - Sep 2010
Volume 19, Issue 2 - Jun 2010
Volume 19, Issue 1 - Mar 2010
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A Study on Throughput Increase in Semiconductor Package Process of K Manufacturing Company Using a Simulation Model
Chai, Jong-In ; Park, Yang-Byung ;
Journal of the Korea Society for Simulation, volume 19, issue 1, 2010, Pages 1~11
K company produces semiconductor package products under the make-to-order policy to supply for domestic and foreign semiconductor manufacturing companies. Its production process is a machine-paced assembly line type, which consists of die sawing, assembly, and test. This paper suggests three plans to increase process throughput based on the process analysis of K company and evaluates them via a simulation model using a real data collected. The three plans are line balancing by adding machines to the bottleneck process, product group scheduling, and reallocation of the operators in non-bottleneck processes. The evaluation result shows the highest daily throughput increase of 17.3% with an effect of 2.8% reduction of due date violation when the three plans are applied together. Payback period for the mixed application of the three plans is obtained as 1.37 years.
Multibody Dynamics Simulation and Experimental Study on the Tagline Control of a Cargo Suspended by a Floating Crane
Ku, Nam-Kug ; Lee, Kyu-Yuel ; Kwon, Jung-Han ; Cha, Ju-Hwan ; Ham, Seung-Ho ; Ha, Sol ; Park, Kwang-Phil ;
Journal of the Korea Society for Simulation, volume 19, issue 1, 2010, Pages 13~22
This paper describes tagline PD control for reduction of motion for the heavy cargo(load) suspended by a floating crane. The equations of motion are set up considering the 6-degree-of-freedom floating crane and the 6-degree-of-freedom load based on multi-body system dynamics. The tagline mechanism is applied to floating crane to control motion of the heavy cargo(load). The winch, mounted on the deck of floating crane, is used to control the tension of tagline. To generate control force, PD control algorithm is applied. Numerical simulation and experiment is executed to verify the tagline control mechanism. The numerical simulation and experiment shows that the tagline control mechanism reduces the motion of the load suspended by a floating crane.
Image Data Loss Minimized Geometric Correction for Asymmetric Distortion Fish-eye Lens
Cho, Young-Ju ; Kim, Sung-Hee ; Park, Ji-Young ; Son, Jin-Woo ; Lee, Joong-Ryoul ; Kim, Myoung-Hee ;
Journal of the Korea Society for Simulation, volume 19, issue 1, 2010, Pages 23~31
Due to the fact that fisheye lens can provide super wide angles with the minimum number of cameras, field-of-view over 180 degrees, many vehicles are attempting to mount the camera system. Not only use the camera as a viewing system, but also as a camera sensor, camera calibration should be preceded, and geometrical correction on the radial distortion is needed to provide the images for the driver's assistance. In this thesis, we introduce a geometric correction technique to minimize the loss of the image data from a vehicle fish-eye lens having a field of view over
, and a asymmetric distortion. Geometric correction is a process in which a camera model with a distortion model is established, and then a corrected view is generated after camera parameters are calculated through a calibration process. First, the FOV model to imitate a asymmetric distortion configuration is used as the distortion model. Then, we need to unify the axis ratio because a horizontal view of the vehicle fish-eye lens is asymmetrically wide for the driver, and estimate the parameters by applying a non-linear optimization algorithm. Finally, we create a corrected view by a backward mapping, and provide a function to optimize the ratio for the horizontal and vertical axes. This minimizes image data loss and improves the visual perception when the input image is undistorted through a perspective projection.
War-game Simulator Using Event based Web Services
Lee, Jae-Min ; Kim, Byoung-Chul ; Kim, Tae-Sup ; Lee, Kang-Sun ;
Journal of the Korea Society for Simulation, volume 19, issue 1, 2010, Pages 33~39
As future warfare becomes network-centric, war-game simulators require high interoperability between networked forces and dynamic reconfiguration in accordance with war events. In this paper, we propose an event-driven methodology to develop dynamic war-game simulations. Federates are developed by event-driven web services. The event-driven web services consistently sense war events and response them only if they are interested. By the sense-and-response mechanism and asynchronous event processing, we are able to save simulation time. An Anti-Surface-Warfare simulator is constructed to demonstrate the methodology and suggests that event-driven web services are efficient to model and simulate warfare where numerous events are generated from hardware systems and people dispersed on the network.
Development of Power Plant Simulator for Control System Verification & Validation
Byun, Seung-Hyun ; Hwang, Do-Hyun ;
Journal of the Korea Society for Simulation, volume 19, issue 1, 2010, Pages 41~51
A control system has been being developed by korean engineers for 500MW korean standard type fossil power plant with the advent of retrofit of old control system. Simulators have been used for digital I&C system pre-tests and validation tests in nuclear power plants. In this paper, the power plant simulator for control system V&V was developed in order to verify the developed control system prior to application to a power plant. The control models were developed using plant control system data, translator programs, and vendor manuals. The developed simulator was verified by steady-state test, load swing test, transient test and so on.
Dynamic Threshold Determination Method for Energy Efficient SEF using Fuzzy Logic in Wireless Sensor Networks
Choi, Hyeon-Myeong ; Lee, Sun-Ho ; Cho, Tae-Ho ;
Journal of the Korea Society for Simulation, volume 19, issue 1, 2010, Pages 53~61
In wireless sensor networks(WSNs) individual sensor nodes are subject to security compromises. An adversary can physically capture sensor nodes and obtain the security information. And the adversary injects false reports into the network using compromised nodes. If undetected, these false reports are forwarded to the base station. False reports injection attacks can not only result in false alarms but also depletion of the limited amount of energy in battery powered sensor nodes. To combat these false reports injection attacks, several filtering schemes have been proposed. The statistical en-routing filtering(SEF) scheme can detect and drop false reports during the forwarding process. In SEF, The number of the message authentication codes(threshold) is important for detecting false reports and saving energy. In this paper, we propose a dynamic threshold determination method for energy efficient SEF using fuzzy-logic in wireless sensor networks. The proposed method consider false reports rate and the number of compromised partitions. If low rate of false reports in the networks, the threshold should low. If high rate of false reports in networks, the threshold should high. We evaluated the proposed method’s performance via simulation.
Development of Simulator for Analyzing Intercept Performance of Surface-to-air Missile
Kim, Ki-Hwan ; Seo, Yoon-Ho ;
Journal of the Korea Society for Simulation, volume 19, issue 1, 2010, Pages 63~71
In modern war, Intercept Performance of SAM(Surface to Air Missile) is gaining importance as range and precision of Missile and Guided Weapon on information warfare have been improved. An aerial defence system using Surface-to-air Radar and Guided Missile is needed to be built for prediction and defense from threatening aerial attack. When developing SAM, M&S is used to free from a time limit and a space restriction. M&S is widely applied to education, training, and design of newest Weapon System. This study was conducted to develop simulator for evaluation of Intercept Performance of SAM. In this study, architecture of Intercept Performance of SAM analysis simulator for estimation of Intercept Performance of various SAM was suggested and developed. The developed Intercept Performance of SAM analysis simulator was developed by C++ and Direct3D, and through 3D visualization using the Direct3D, it shows procedures of the simulation on a user animation window. Information about design and operation of Fighting model is entered through input window of the simulator, and simulation engine consisted of Object Manager, Operation Manager, and Integrated Manager conducts modeling and simulation automatically using the information, so the simulator gives user feedback in a short time.
Short-term Scheduling Optimization for Subassembly Line in Ship Production Using Simulated Annealing
Hwang, In-Hyuck ; Noh, Jac-Kyou ; Lee, Kwang-Kook ; Shin, Jon-Gye ;
Journal of the Korea Society for Simulation, volume 19, issue 1, 2010, Pages 73~82
Productivity improvement is considered as one of hot potato topics in international shipyards by the increasing amount of orders. In order to improve productivity of lines, shipbuilders have been researching and developing new work method, process automation, advanced planning and scheduling and so on. An optimization approach was accomplished on short-term scheduling of subassembly lines in this research. The problem of subassembly line scheduling turned out to be a non-deterministic polynomial time problem with regard to SKID pattern’s sequence and worker assignment to each station. The problem was applied by simulated annealing algorithm, one of meta-heuristic methods. The algorithm was aimed to avoid local minimum value by changing results with probability function. The optimization result was compared with discrete-event simulation's to propose what pros and cons were. This paper will help planners work on scheduling and decision-making to complete their task by evaluation.
Improving the Performance of the User Creative Contents Retrieval Using Content Reputation and User Reputation
Bae, Won-Sik ; Cha, Jeong-Won ;
Journal of the Korea Society for Simulation, volume 19, issue 1, 2010, Pages 83~90
We describe a novel method for improving the performance of the UCC retrieval using content reputation and user reputation. The UCC retrieval is a part of the information retrieval. The goal of the information retrieval system finds documents what users want, so the goal of the UCC retrieval system tries to find UCCs themselves instead of documents. Unlike the document, the UCC has not enough textual information. Therefore, we try to use the content reputation and the user reputation based on non-textual information to gain improved retrieval performance. We evaluate content reputation using the information of the UCC itself and social activities between users related with UCCs. We evaluate user reputation using individual social activities between users or users and UCCs. We build a network with users and UCCs from social activities, and then we can get the user reputation from the network by graph algorithms. We collect the information of users and UCCs from YouTube and implement two systems using content reputation and user reputation. And then we compare two systems. From the experiment results, we can see that the system using content reputation outperforms than the system using user reputation. This result is expected to use the UCC retrieval in the feature.
A Study on the Battle Management Language Application for the C4I and M&S Interoperation in ROK Forces
Jung, Whan-Sik ; Lee, Jae-Yeong ;
Journal of the Korea Society for Simulation, volume 19, issue 1, 2010, Pages 91~101
Battle Management Language (BML) is defined as an unambiguous language intended to provide for command and control of simulated and live forces in U.S. It has been developed to connect between command and control system and Modeling & Simulation in the U.S., including NATO M&S Working Group. Its goal is to provide situational awareness and offer a path forward for interoperation of C2 systems and simulations. This study deals with BML development in U.S. that begins from army and is being expanded in multinational environment. It also proposes the BML application for C4I and M&S interoperation in the Korean forces. Recent developments of BML in U.S. have shown the potential for interoperation between C2 systems and simulations in a coalition environment. Finally, this study proposes a general BML application method and shows the example of its application to the Korea Joint Command Control System (KJCCS). It provides an architecture and a milestone for BML application in the Korean forces.
High Speed Korean Dependency Analysis Using Cascaded Chunking
Oh, Jin-Young ; Cha, Jeong-Won ;
Journal of the Korea Society for Simulation, volume 19, issue 1, 2010, Pages 103~111
Syntactic analysis is an important step in natural language processing. However, we cannot use the syntactic analyzer in Korean for low performance and without robustness. We propose new robust, high speed and high performance Korean syntactic analyzer using CRFs. We treat a parsing problem as a labeling problem. We use a cascaded chunking for Korean parsing. We label syntactic information to each Eojeol at each step using CRFs. CRFs use part-of-speech tag and Eojeol syntactic tag features. Our experimental results using 10-fold cross validation show significant improvement in the robustness, speed and performance of long Korea sentences.
A Simulation Study of Stochastic Combat Networks
Min, Hyun-Joon ; Hong, Yoon-Gee ;
Journal of the Korea Society for Simulation, volume 19, issue 1, 2010, Pages 113~123
The interest in combat network systems rises among specialists as the military technology advances. This study considers some new elements such as characteristics of weapon systems, force moving rules at the end of each small battle, etc. to improve the accuracy of the analysis of series of mini battle problems. There is a significant difference in MOEs among the scenarios and the models. This study suggests some further works in weapon allocation, moving speed, tactics, weather, and topography which need to be investigated.
A Key Redistribution Method for Enhancing Energy Efficiency in Dynamic Filtering based Sensor Networks
Sun, Chung-Il ; Cho, Tae-Ho ;
Journal of the Korea Society for Simulation, volume 19, issue 1, 2010, Pages 125~131
In wireless sensor networks application, sensor nodes are randomly deployed in wide and opened environment typically. Since sensor networks have these features, it is vulnerable to physical attacks in which an adversary can capture deployed nodes and use them to inject a fabricated report into the network. This threats of network security deplete the limited energy resource of the entire network using injected fabricated reports. A dynamic en-route filtering scheme is proposed to detect and drop the injected fabricated report. In this scheme, node executes the key redistribution to increases the detection power. It is very important to decide the authentication key redistribution because a frequent key redistribution can cause the much energy consumption of nodes. In this paper, we propose a key redistribution determining method to enhance the energy efficiency and maintain the detection power of network. Each node decides the authentication key redistribution using a fuzzy system in a definite period. The proposed method can provide early detection of fabricated reports, which results in energy-efficiency against the massive fabricated report injection attacks.
Simulation Analysis of Control Variates Method Using Stratified sampling
Kwon, Chi-Myung ; Kim, Seong-Yeon ; Hwang, Sung-Won ;
Journal of the Korea Society for Simulation, volume 19, issue 1, 2010, Pages 133~141
This research suggests a unified scheme for using stratified sampling and control variates method to improve the efficiency of estimation for parameters in simulation experiments. We utilize standardized concomitant variables defined during the course of simulation runs. We first use these concomitant variables to counteract the unknown error of response by the method of control variates, then use a concomitant variable not used in the controlled response and stratify the response into appropriate strata to reduce the variation of controlled response additionally. In case that the covariance between the response and a set of control variates is known, we identify the simulation efficiency of suggested method using control variates and stratified sampling. We conjecture the simulation efficiency of this method is better than that achieved by separated application of either control variates or stratified sampling in a simulation experiments. We investigate such an efficiency gain through simulation on a selected model.
Various Quality Fingerprint Classification Using the Optimal Stochastic Models
Jung, Hye-Wuk ; Lee, Jee-Hyong ;
Journal of the Korea Society for Simulation, volume 19, issue 1, 2010, Pages 143~151
Fingerprint classification is a step to increase the efficiency of an 1:N fingerprint recognition system and plays a role to reduce the matching time of fingerprint and to increase accuracy of recognition. It is difficult to classify fingerprints, because the ridge pattern of each fingerprint class has an overlapping characteristic with more than one class, fingerprint images may include a lot of noise and an input condition is an exceptional case. In this paper, we propose a novel approach to design a stochastic model and to accomplish fingerprint classification using a directional characteristic of fingerprints for an effective classification of various qualities. We compute the directional value by searching a fingerprint ridge pixel by pixel and extract a directional characteristic by merging a computed directional value by fixed pixels unit. The modified Markov model of each fingerprint class is generated using Markov model which is a stochastic information extraction and a recognition method by extracted directional characteristic. The weight list of classification model of each class is decided by analyzing the state transition matrixes of the generated Markov model of each class and the optimized value which improves the performance of fingerprint classification using GA (Genetic Algorithm) is estimated. The performance of the optimized classification model by GA is superior to the model before the optimization by the experiment result of applying the fingerprint database of various qualities to the optimized model by GA. And the proposed method effectively achieved fingerprint classification to exceptional input conditions because this approach is independent of the existence and nonexistence of singular points by the result of analyzing the fingerprint database which is used to the experiments.
A Strategy for Validation in Preliminary Design Stage using The Simulation of Model Behavior
Shin, Seung-Hun ; Park, Seung-Kyu ; Choi, Kyung-Hee ;
Journal of the Korea Society for Simulation, volume 19, issue 1, 2010, Pages 153~160
Most part of errors in software development process are included during the stage of requirements definition and design. And correction or elimination of errors from those stages requires much more efforts and costs than those from the later part of software development process. However, despite of the importance of the validation of requirement definition and design stages, several kinds of problem have made it hard to be done successfully. Therefore, in this paper, we introduce a novel validation process for the preliminary design stage. The validation process is based on simulations of model and it can be used to validate requirements and model simultaneously. Models in the validation process will take only the behavior of software and be built on Ptolemy framework. The usability of our validation process is confirmed with a case study over DNS system environment. And the result of simulation shows well-known errors or vulnerabilities can be found with simulations of model which has the behavior of software. This means our validation process can be used as a process to validate requirements and models during the early stage of software development process.
Static Filtering Probability Control Method Based on Reliability of Cluster in Sensor Networks
Hur, Suh-Mahn ; Seo, Hee-Suk ; Lee, Dong-Young ; Kim, Tae-Kyung ;
Journal of the Korea Society for Simulation, volume 19, issue 1, 2010, Pages 161~171
Sensor Networks are often deployed in unattended environments, thus leaving these networks vulnerable to false data injection attacks in which an adversary injects forged reports into the network through compromised nodes. Such attacks by compromised sensors can cause not only false alarms but also the depletion of the finite amount of energy in a battery powered network. Ye et al. proposed the Statistical En-route Filtering scheme to overcome this threat. In statistical en-route filtering scheme, all the intermediate nodes perform verification as event reports created by center of stimulus node are forwarded to the base station. This paper applies a probabilistic verification method to the Static Statistical En-route Filtering for energy efficiency. It is expected that the farther from the base station an event source is, the higher energy efficiency is achieved.