• Title/Summary/Keyword: Modeling&Simulation

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Grid-connected Wind Turbine Generation System Modeling and Simulation Using MATLAB/Simulink (MATLAB/Simulink를 이용한 계통연계 풍력발전 시스템 모델링 및 시뮬레이션)

  • An, Hae-Joon;Kim, Hyun-Goo;Jang, Gil-Soo;Jang, Moon-Seok;Ko, Seok-Whan
    • 한국신재생에너지학회:학술대회논문집
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    • 2008.10a
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    • pp.321-323
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    • 2008
  • This study suggests a modeling of grid-connected wind turbine generation systems and performs simulation according to increase/decrease of real wind speed. MATLAB/Simulink implemented modeling of grid-connected wind turbine generation system. Terminal voltage, grid voltage, and active/reactive power shall be observed following the performance of simulation.

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A Study on Zoning Model Using Web-Cyclone (웹사이클론을 이용한 조닝모듈 개발에 관한 연구)

  • Gwak, Han-Seong;Son, Chang-Back;Lee, Dong-Eun
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2012.11a
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    • pp.115-117
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    • 2012
  • Task based modeling is essential in a construction operation simulation modeling. It allows dealing with local variables or delay factors that affect productivity and improves the reusability of existing operation models. An operation model can secure reality only if it reflects the real construction processes by effectively dealing with zoning issue. However, system users have some difficulties in modeling a construction operation that is consisted of several processes having different production units. Zoning is a major modeling issue when the task based modeling method is implemented using the existing discrete event simulation systems. This paper highlights the difficulty and presents a new method that complements the zoning issues attributed to different production units. The method is described in detail by presenting the flow of entities. It is confirmed that the zoning method effectively deals with the unbalance of production units between processes and facilitates to model an operation model having processes with different production units. The "Zoning module" contributes to increasing accuracy of simulation result.

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Preliminary Simulation Analysis of the LASGIT Experiment (방사성 폐기물의 지중저장을 위한 스웨덴 LASGIT 실험의 예비적인 시뮬레이션 분석)

  • Park, Chan-Hee;Walsh, Robert
    • 한국신재생에너지학회:학술대회논문집
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    • 2011.05a
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    • pp.197.2-197.2
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    • 2011
  • Preliminary analysis on the modeling conditions and the simulation results is conducted only to evaluate the correctness of the simulation configuration further to apply for the LASGIT project. Except for the unrealistic modeling conditions for the relations of capillary pressure and relative permeability against water saturation used previously, the simulation results successfully demonstrate Helium propagation typical for two-phase flow. Further elaborated simulation with more realistic parameters should complete the weak points of the preliminary work.

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Simulation of Benzene-Toluene-Xylene Plant (BTX제조공정의 모사연구)

  • 정해동
    • Journal of the Korea Society for Simulation
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    • v.4 no.1
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    • pp.121-130
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    • 1995
  • This paper deals with modeling and simulation of an industrial benzene-toluene-xylene plant. Because the fractionation unit of benzene-toluene-xylene plant has a narrow range of boiling point and doesn't have any sidecut and side reboiler, we employed boiling point estimation method in the modeling and simulation of the plant. Soave-Redlich-Kwong equation was used in the computation of thermodynamical properties. We solved resulting nonlinear equations by using Newton-Raphson method which is known to show fast convergence. Results of simulation showed good agreement with actual plant operation data.

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Network Security Modeling and Simulation Using the SES/MB Framework (SES/MB 프레임워크를 이용한 네트워크 보안 모델링 및 시뮬레이션)

  • 지승도;박종서;이장세;김환국;정기찬;정정례
    • Journal of the Korea Institute of Information Security & Cryptology
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    • v.11 no.2
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    • pp.13-26
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    • 2001
  • This paper presents the network security modeling methodology and simulation using the hierarchical and modular modeling and simulation framework. Recently, Howard and Amoroso developed the cause-effect model of the cyber attack, defense, and consequences, Cohen has been proposed the simplified network security simulation methodology using the cause-effect model, however, it is not clear that it can support more complex network security model and also the model-based cyber attack simulation. To deal with this problem, we have adopted the hierarchical and modular modeling and simulation environment so called the System Entity Structure/Model Base (SES/MB) framework which integrates the dynamic-based formalism of simulation with the symbolic formalism of AI. Several simulation tests performed on sample network system verify the soundness of our method.

High-level Discrete-event Modeling-based Business Process Simulation for the Scheduling of the Ship Hull Production Design (조선 선체 생산설계 일정 계획을 위한 상세 이산사건 모델링기반 비즈니스 프로세스 시뮬레이션)

  • Son, Myeong-Jo;Kim, Tae-Wan
    • Korean Journal of Computational Design and Engineering
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    • v.18 no.3
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    • pp.224-233
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    • 2013
  • For the scheduling and the job assignment of the ship hull production design which is a process-based work, we suggest the simulation-based scheduling using the discrete-event-based business process simulation. First, we analyze the ship hull production design process from the perspective of a job assignment to make it into the simulation model using DEVS (Discrete Event System Specification) which is the representative modeling method for a discrete-event simulation. Based on the APIs of the open-source discrete-event simulation engine, we implement the simulation using the Groovy script. We develop the scenario generator in which the user defines detail information of the construction drawing and its member blocks, and design engineers information, and the various setting for the simulation including the job assignment strategy. We use the XML files from this scenario generator as inputs of simulation so that we can get simulation result in forms of Gantt chart without changes of the simulation model.

Shadow Modeling using Z-map Algorithm for Process Simulation of OLED Evaporation

  • Lee, Eung-Ki
    • 한국정보디스플레이학회:학술대회논문집
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    • 2004.08a
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    • pp.487-490
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    • 2004
  • In order to simulate OLED evaporation process, modeling of directional distribution of the vaporized organic materials, film thickness distribution profile and pattern-mask shadow effect are required In accordance with many literatures; all of them except shadow effect modeling are studied and developed. In this paper, modeling algorithm of evaporation shadow is presented for process simulation of full-color OLED evaporating system. In OLED evaporating process the offset position of the point cell-source against the substrate rotation axis and the usage of the patterned mask are the principal causes for evaporation shadow. For geometric simulation of shadow using z-map, the film thickness profile, which is condensed on a glass substrate, is converted to the z-map data. In practical evaporation process, the glass substrate is rotated. This physical fact is solved and modeled mathematically for z-map simulation. After simulating the evaporation process, the z-map data can present the shadow-effected film thickness profile. Z-map is an efficient method in that the cross-sectional presentations of the film thickness profile and thickness distribution evaluation are easily and rapidly achieved.

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A Comparative Study of FMS Performance Evaluation Modeling Using FACTOR/AIM (FACTOR/AIM을 이용한 통합자동 생산시스템의 성능분석을 위한 비교연구)

  • Hwang, Heung-Suk
    • IE interfaces
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    • v.9 no.2
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    • pp.191-202
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    • 1996
  • A variety of approaches on performance evaluation modeling have appeared in the technical literature for flexible manufacturing systems(FMS) which can be evaluated only through computer simulation. This study represents a comparative approach for FMS performance evaluation modeling based on reliability, availability and maintainability, and life cycle cost. The methodology proposed in this research includes the following three-step generative approaches. First, a static model to find the initial system configuration is considered under the assumption that the system availability is given as one (failure and maintenance are not considered), and in second step, a stochastic simulation is proposed to serve as a performance evaluation model for FMS with stochastic failure and repair time. In the last step, we developed a simulation modeling using a simulator, FACTOR/AIM to consider a variety of performance factors and dynamic behavior of FMS. Also the applicability and validity of the proposed approaches has been tested and compared through the results of a sample problem using computer programs and procedures developed in each step.

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Modeling of Turbulent Molecular Mixing by the PDF Balance Method for Turbulent Reactive Flows (난류연소 유동장에서의 확률밀도함수 전달방정식을 이용한 난류혼합 모델링)

  • Moon, Hee-Jang
    • Journal of the Korean Society of Combustion
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    • v.2 no.1
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    • pp.39-51
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    • 1997
  • A review of probability density function(PDF) methodology and direct numerical simulation for the purpose of modeling turbulent combustion are presented in this study where particular attention is focused on the modeling problem of turbulent molecular mixing term appearing in PDF transport equation. Existing mixing models results were compared to those evaluated by direct numerical simulation in a turbulent premixed medium with finite rate chemistry in which the initial scalar field is composed of pockets of partially burnt gases to simulate autoignition. Two traditional mixing models, the least mean square estimations(LMSE) and Curl#s model are examined to see their prediction capability as well as their modeling approach. Test calculations report that the stochastically based Curl#s approach, though qualitatively demonstrates some unphysical behaviors, predicts scalar evolutions which are found to be in good agreement with statistical data of direct numerical simulation.

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A Simulation on the Weapon System of Rotorcraft for Improving the Effects of Korean Future Combat System(FCS) (한국형 미래전투체계 효과도 분석을 위한 회전익 무장체계 시뮬레이션)

  • Hong, Jungwan;Park, Sang C.;Kwon, Yongjin
    • Journal of the Korea Institute of Military Science and Technology
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    • v.16 no.4
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    • pp.501-506
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    • 2013
  • This research is to develop a simulation framework to gauge the mission effectiveness of the rotorcraft system that will be a part of Korean future combat system. The rotorcraft system comprises of many subsystems that are very time-consuming and tedious to model. Each subsystem and its characteristics have been modeled using component-based modeling techniques, which enhances its reusability. The entire system is then constructed from the individually modeled component, which significantly reduces the modelling time. The mission effectiveness of the rotorcraft system is simulated using the developed models, and the output indicates that the methodology proposed in this study is useful, which will be suitable for the modeling and simulation of Korean future combat system.