• Title/Summary/Keyword: event-based

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Discrete Event Simulation and Its Application to Railway Maintenance Evaluation System (철도차량 유지보수 장비의 Discrete Event Simulation 기반 기초 성능평가 및 적용방안 연구)

  • Mun Hyeong-Seok;Jang Chang-Du;Ha Yun-Seok;Jo Yeong-Cheon
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2005.06a
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    • pp.331-336
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    • 2005
  • A lot of manufacturing knowledge and method have applied to increase manufacturing efficiency in industry field. DES(Discrete Event Simulation) is one of solution to deal with manufacturing problems in factory. Beginning of research, old maintenance system of KNR ( Korea National Railroad) and its technical problems are basically investigated. KNR has maintained railway vehicle with their own solution based on experience. Very advanced railway vehicles such as KTX (Korea Train Express) and TTX(Tilting Train Express) will be difficult to maintain with their old maintenance method. In order to apply knowledge of DES, maintenance field of railway must be considered. Imaginary maintenance machine are selected to variable of DES. Maintenance capability of each machine will be evaluated base on imaginary data from imaginary machine. The machine could be very expensive as well as difficult to replace. Target of research is minimization of number of machine in railway workshop. So basic knowledge of discrete event simulation is introduced. Then five essential stages of discrete event simulation are provided. Each maintenance case defined as event. Each event is discrete and simulated base on different case such as one maintenance line with one machine and one maintenance line with two machines in railway workshop. simple maintenance method, discrete event simulation, will be come out very powerful in complicate maintenance system and will be helpful to reduce maintenance cost as well as maintenance labor.

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Event Detection on Motion Activities Using a Dynamic Grid

  • Preechasuk, Jitdumrong;Piamsa-nga, Punpiti
    • Journal of Information Processing Systems
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    • v.11 no.4
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    • pp.538-555
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    • 2015
  • Event detection based on using features from a static grid can give poor results from the viewpoint of two main aspects: the position of the camera and the position of the event that is occurring in the scene. The former causes problems when training and test events are at different distances from the camera to the actual position of the event. The latter can be a source of problems when training events take place in any position in the scene, and the test events take place in a position different from the training events. Both issues degrade the accuracy of the static grid method. Therefore, this work proposes a method called a dynamic grid for event detection, which can tackle both aspects of the problem. In our experiment, we used the dynamic grid method to detect four types of event patterns: implosion, explosion, two-way, and one-way using a Multimedia Analysis and Discovery (MAD) pedestrian dataset. The experimental results show that the proposed method can detect the four types of event patterns with high accuracy. Additionally, the performance of the proposed method is better than the static grid method and the proposed method achieves higher accuracy than the previous method regarding the aforementioned aspects.

A Method for Mining Interval Event Association Rules from a Set of Events Having Time Property (시간 속성을 갖는 이벤트 집합에서 인터벌 연관 규칙 마이닝 기법)

  • Han, Dae-Young;Kim, Dae-In;Kim, Jae-In;Na, Chol-Su;Hwang, Bu-Hyun
    • The KIPS Transactions:PartD
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    • v.16D no.2
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    • pp.185-190
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    • 2009
  • The event sequence of the same type from a set of events having time property can be summarized in one event. But if the event sequence having an interval, It is reasonable to be summarized more than one in independent sub event sequence of each other. In this paper, we suggest a method of temporal data mining that summarizes the interval events based on Allen's interval algebra and finds out interval event association rule from interval events. It provides better knowledge than others by using concept of an independent sub sequence and finding interval event association rules.

DISCRETE EVENT SYSTEM SIMULATION APPROACH FOR AN OPERATION ANALYSIS OF A HEADEND PROCESS FACILITY

  • Lee, Hyo-Jik;Kim, Sung-Hyun;Park, Byung-Suk
    • Nuclear Engineering and Technology
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    • v.41 no.5
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    • pp.739-746
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    • 2009
  • This paper introduces facility operation modeling and simulation based primarily on a discrete event system modeling scheme. Many modern industrial facilities are so complex that their operational status cannot be estimated by simple calculations. In general, a facility can consist of many processes and transfers of material between processes that may be modeled as a discrete event system. This paper introduces the current status of studies on operation modeling and simulation for typical nuclear facilities, along with some examples. In addition, this paper provides insights about how a discrete event system can be applied to a model for a nuclear facility. A headend facility is chosen for operation modeling and the simulation, and detailed procedure is thoroughly described from modeling to an analysis of discrete event results. These kinds of modeling and simulation are very important because they can contribute to facility design and operation in terms of prediction of system behavior, quantification of facility capacity, bottleneck identification and efficient operation scheduling.

A Study on the Efficiency of the EPCIS using Simulation (시뮬레이션을 이용한 EPCIS의 효율화 방안에 관한 연구)

  • Li, Zhong-Shi;Lee, Chang-Ho
    • Proceedings of the Safety Management and Science Conference
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    • 2010.11a
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    • pp.349-355
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    • 2010
  • EPCIS(EPC Information Services) system is a core component of EPCglobal Architecture Framework offering information of the freights, the time of awareness and the location of awareness on the EPCglobal Network. The role of EPCIS is to exchange information based on EPC. There are four kinds of event data which are object event data, aggregation event data, quantity event data, and transaction event data. These EPCIS events data are stored and managed in EPCIS repository. This paper leads to separate a in-out data overload of integrated EPCIS event and suggests the method to effectively manage EPCIS repository for exchanging data smoothly. In order to verify a effectiveness, we measure the performance of the system using a simple testing simulation by comparing existing method and suggested method.

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A Model Formalization Methodology of Discrete Event Simulation with Formal Tools (형식 도구를 이용한 이산사건 시뮬레이션의 모델 형식화 방법론)

  • ;;Jeong, Young Sik;Baik, Doo Kwon
    • Journal of the Korean Operations Research and Management Science Society
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    • v.17 no.3
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    • pp.79-99
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    • 1992
  • The DEVS (Discrete Event system Specification) formal model for discrete event simulation is a hierarchical, modular model. Because the DEVS formal model has a mathematical structure, it provides a theoretic background of discrete event simulation model. However, the DEVS formal model is difficult to understand because of its mathematical structure. Also, since the DEVS formal model is often constructed by heuristic, subjective method of model designer from the model, a systematic model built-in methodology does not exist. In this paper, we propose the model formalization methodology from an informal model to the DEVS formal model. For this formalization methodology, we introduce formal tools for model construction based on the DEVS ( from an informal model : Event Dependency Graph (EDG) for the event analysis and State Representation Graph(SRG) for the system state analysis.

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A Study on the Measurement of Spatial Density and Structural Characteristic Evaluation using Discrete Event Simulation (이산사건 시뮬레이션을 활용한 공간밀도측정 및 구조특성평가)

  • Yoon, So Hee;Kim, Gun A;Kim, Suk Tae
    • Journal of Korea Multimedia Society
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    • v.20 no.7
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    • pp.1090-1101
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    • 2017
  • This study analyzes spatial density and integration of Space Syntax and Discrete Event Simulation (DEVS) of complex system theory and analyzes spatial structure by property, type and depth. The aim of this study is to secure the validity of the theoretical application. The study evaluated the correlation between spatial density and integration by setting up eight types of analysis models. In addition, analyzed the correlation of structural characteristics and approached the application of discrete event simulation of spatial syntax theory. It is confirmed that the concept of integration of spatial syntax theory and analysis using discrete event simulation are valid as new spatial analysis methodology. Also expect that realistic and concrete predictions will be possible if discrete event simulation evolves into research for space allocation and space efficiency optimization.

A Study on Stream Reactor for the event processing of multimedia streams in context-based (컨텍스트 기반에서의 멀티미디어 스트림의 사건처리를 위한 Stream Reactor연구)

  • Park, Yong-Hee;Kang, Tae-Sung;Lim, Young-Hwan
    • Proceedings of the Korea Information Processing Society Conference
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    • 2000.04a
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    • pp.1166-1171
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    • 2000
  • 기존의 멀티미디어 연구의 실현에 있어 가장 큰 문제라 할 수 있던 성능의 문제가 하드웨어의 급속한 발달로 해결되어 감에 따라 멀티미디어 및 제반 관련기술도 함께 발전되었으며 이에 기반한 multimedia stream에서의 event를 검출하기 위한 다양한 연구들이 진행되어 왔다. 그러나 지금까지의 연구는 주로 전송 및 저장, 검색에 집중되어 연구되어 왔으며 영상인식 등의 Vision관련 연구에서는 멀티미디어 스트리밍 기술과의 연동을 고려하지 않은 연구를 수행함에 따라 검출 가능한 event가 있다고 하더라도 응용영역에 종속적인 인테페이스만을 고려함에 따라 사용자가 이를 기술(記述, description)하거나, 사용자에게 검출 가능한 event를 제시하기 위해 일반화된 방법이 제시되어 있지 않았다. 본 연구에서는 사용자가 검출을 원하는 event를 기술하는 방법과, 시스템에서 검출 가능한 event를 제시하기 위한 방법을 제안하고, 제시되는 방법이 응용영역에 독립적이기 위해 요구되는 사항들과 객체 단위인 이벤트/행위와 처리기 사이의 인터페이스에 관하여 정의한 후 기본적인 동작방식을 제안한다.

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Mediating Effect of Decentering between Centrality of Event and Meaning Reconstruction on Relational Loss Experience (관계상실경험자의 사건중심성과 의미재구성의 관계: 탈중심화의 매개효과)

  • Kim, Soon-Me;Lee, Su-Lim
    • The Journal of the Korea Contents Association
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    • v.20 no.6
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    • pp.445-459
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    • 2020
  • The purpose of this study was to verify the mediating effect of decentering between centrality of event and meaning reconstruction, based on relational loss experiences. To do so, surveys were conducted on 295 people(male: 109, female: 186) who would experience relational loss and be over 20 years old in the country using a questionnaire including a relational loss history checklist, the CES(Centrality of Event Scale), the Decentering Scale and the GMRI(Grief and Meaning Reconstruction Inventory). And the valid data were statistically processed using SPSS 22.0 program. The results of the study was followed. First, both centrality of event and decentering had positive corrleations with meaning reconstruction. Second, decentering completely mediated relationship of centrality of event and meaning reconstruction. Centrality of event had no direct effect on meaning reconstruction and the entire effect of centrality of event on meaning reconstruction was transmitted only through the path of decentering. Based on these results, limitations and implications of this study and suggestions for future studies were discussed.

Discrete Event Simulation for the Initial Capacity Estimation of Shipyard Based on the Master Production Schedule (대일정 생산 계획에 따른 조선소 생산 용량의 초기 평가를 위한 이산사건 시뮬레이션)

  • Kim, Kwang-Sik;Hwang, Ho-Jin;Lee, Jang-Hyun
    • Korean Journal of Computational Design and Engineering
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    • v.17 no.2
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    • pp.111-122
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    • 2012
  • Capacity planning plays an important role not only for master production plan but also for facility or layout design in shipbuilding. Product work breakdown structure, attributes of production resources, and production method or process data are associated in order to make the discrete event simulation model of shipyard layout plan. The production amount of each process and the process time is assumed to be stochastic. Based on the stochastic discrete event simulation model, the production capacity of each facility in shipyard is estimated. The stochastic model of product arrival time, process time and transferring time is introduced for each process. Also, the production capacity is estimated for the assumed master production schedule.