• 제목/요약/키워드: Realtime modeling

검색결과 53건 처리시간 0.038초

수송장비의 실시간 가상 시뮬레이션을 위한 3차원 데이터베이스의 체계적인 구축 프로세스 (A Systematic Construction Process of 3D Database for Realtime Virtual Simulation of Transportation Equipments)

  • 김보현
    • 산업공학
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    • 제16권2호
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    • pp.258-267
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    • 2003
  • Recently, virtual reality technologies have been rapidly developed and realtime virtual simulation methods have been extensively employed for several application areas such as game, sports, manufacturing, military, and so on. A 3D database in realtime virtual simulation plays a key role because it makes users feel reality in virtual space. In a application view of 3D database, a systematic construction approach is required to reduce its construction time and increase its quality. However, many researches have been mostly focused on realtime graphic issues and its key technologies. In virtual simulation of transportation equipments, this paper proposes a systematic construction process of 3D database consisting of four stages as follows: 1) determine the activity space of a equipment, 2) collect data related to 3D database construction, 3) make a 3-dimensional modeling strategy, and 4) generate and evaluate a 3D model. This paper also introduces a new procedure of 3D environment modeling, which summarizes and expands our modeling experiences, to be used as a modeling guide.

CASE 도구를 이용한 ATC 차상 소프트웨어의 UML 모델링 (Modeling of ATC On-Board Software in UML Using CASE Tool)

  • 양찬석;임재식;한재문;김치조;조용기
    • 한국철도학회:학술대회논문집
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    • 한국철도학회 2006년도 추계학술대회 논문집
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    • pp.947-953
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    • 2006
  • ATC on-board equipment require realtime embedded software with high level of safety and reliability. To satisfy these requirements, many techniques are applied to the development of software during the lifecycle. In case of software modeling, object-oriented methodology is widening its niche replacing traditional structured methodology and modeling in UML using a CASE tool is a growing trend. In this paper, we modeled ATC on-board software in UML using Rhapsody, which is a modeling tool for realtime embedded software. We modeled the behavior of ATC on-board equipment based on state machine diagram and validated the model using the animation feature provided in the tool. According to our study, the CASE tool based on UML showed high level of applicability in modeling and verifying the software with complex behavioral characteristics.

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7자유도 센서차량모델 제어를 위한 비선형신경망 (Nonlinear Neural Networks for Vehicle Modeling Control Algorithm based on 7-Depth Sensor Measurements)

  • 김종만;김원섭;신동용
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2008년도 하계학술대회 논문집 Vol.9
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    • pp.525-526
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    • 2008
  • For measuring nonlinear Vehicle Modeling based on 7-Depth Sensor, the neural networks are proposed m adaptive and in realtime. The structure of it is similar to recurrent neural networks; a delayed output as the input and a delayed error between the output of plant and neural networks as a bias input. In addition, we compute the desired value of hidden layer by an optimal method instead of transfering desired values by backpropagation and each weights are updated by RLS(Recursive Least Square). Consequently, this neural networks are not sensitive to initial weights and a learning rate, and have a faster convergence rate than conventional neural networks. This new neural networks is Error Estimated Neural Networks. We can estimate nonlinear models in realtime by the proposed networks and control nonlinear models.

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병렬 유한요소 모형을 이용한 황해의 실시간 조석 및 태풍해일 산정 (Realtime Tide and Storm-Surge Computations for the Yellow Sea Using the Parallel Finite Element Model)

  • 변상신;최병호;김경옥
    • 한국군사과학기술학회지
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    • 제12권1호
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    • pp.29-36
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    • 2009
  • Realtime tide and storm-surge computations for the Yellow Sea were conducted using the Parallel Finite Element Model. For these computations a high resolution grid system was constructed with a minimum node interval of loom in Gyeonggi Bay. In the modeling, eight main tidal constituents were analyzed and their results agreed well with the observed data. The realtime tide computation with the eight main tidal constituents and the storm-surge simulation for Typhoon Sarah(1959) were also conducted using parallel computing system of MPI-based LINUX clusters. The result showed a good performance in simulating Typhoon Sarah and reducing the computation time.

Enhanced Petri-Net을 이용한 실시간 센서 네트워크의 상황 정보 서비스 모델링 (Context-Awareness Service Modeling of Realtime Sensor Network using Enhanced Petri-Net)

  • 이재봉;이홍로
    • 한국공간정보시스템학회 논문지
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    • 제12권1호
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    • pp.28-36
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    • 2010
  • 컴퓨터 환경에서 한 가지 사건으로 상황이 특징 지워지기도 하지만, 일반적 상황 인식은 공간과 시간을 포함하는 다양한 사건들에 의해서 결정되어 진다. 물리적 공간과 상호 작용하는 실시간 센서 네트워크 상황 인식 서비스는 시간적 특성을 포함한다. 상황 인식 서비스 관계 설정 방법으로 실시간 상황 인식을 시공간적으로 취급하는 것이 요구된다. 본 논문은 상황 인식 모델에 시공간적 특성이 포함 되도록 하는 방법을 제안하고, 이를 개선된 Petri-Net을 이용하여 효과를 확인한다. 실시간 센서 네트워크 상황 인식을 위해 기본 Petri-Net, 패턴화된 Petri-Net 및 시공간 Petri-Net 모델 특성을 연구한다. 이 방법을 이용하여 새만금 온도 변화 탐지에 적용예를 보였다. 본 연구를 통해 시공간 Petri-Net을 사용한 응용 개발 뿐 만 아니라 시공간 상황 인식 모델링에 기여 할 것이다.

정보제어넷 기반 클라우드 워크플로우 모델 (A Cloud Workflow Model Based on the Information Control Net)

  • 순카이;안현;김광훈
    • 인터넷정보학회논문지
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    • 제19권3호
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    • pp.25-33
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    • 2018
  • 본 논문에서는 클라우드 컴퓨팅 환경을 기반으로 하는 실시간 엔터프라이즈 워크플로우 관리 시스템을 구현하는데 있어서 반드시 수반되어야 하는 워크플로우 모델링 방법론으로서 정보제어넷 기반 클라우드 워크플로우 모델을 제안한다. 본 논문에서 제안하는 모델은 클라우드 서비스 배치모델을 기반으로 하는 클라우드 워크플로우 아키텍처, 즉 조직 수준 클라우드 배치모델, 커뮤니티 수준 클라우드 배치모델, 공적 수준 클라우드 배치모델, 혼합형 클라우드 배치모델 등으로 분류되는 클라우드 배치모델에 따른 클라우드 워크플로우 아키텍처를 지원하는 것을 목적으로 한다. 이 모델은 전통적으로 엔터프라이즈 워크플로우의 대표적인 정형적 모델링 기법인 정보제어넷 모델링 방법론을 클라우드 배치모델과 연계할 수 있도록 확장시킨 수학적 그래프 모델이다. 결론적으로, 본 논문에서는 제안된 정보제어넷 기반 클라우드 워크플로우 모델을 적용할 수 있는 클라우드 워크플로우 아키텍처와 그에 따른 클라우드 워크플로우 서비스를 설계함으로써 제안된 모델의 적용가능성을 검증한다.

실시간 탈출 시뮬레이션을 지원하는 건축 디자인도구 개발에 관한 연구 (A Study on the Development of Architectural Design Tool supporting Realtime Evacuation Simulation)

  • 이윤길
    • 한국멀티미디어학회논문지
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    • 제18권5호
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    • pp.641-651
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    • 2015
  • This study intends to develop an evacuation simulation system based on BIM in a real-time manner. The proposed system, an add-on module for Revit Architecture and one of the most popular BIM authoring tools, supports the architectural design as well as real-time evacuation simulation of the design alternatives. This paper introduces the developed system, named SafeBIM, and the design process on which it is based. To evaluate the possibilities of the proposed system in the educational field of architectural design, this study included a feasibility test with college students in an architectural design studio.

다변 환경 적응형 비선형 모델링 제어 신경망 (A Controlled Neural Networks of Nonlinear Modeling with Adaptive Construction in Various Conditions)

  • 김종만;신동용
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2004년도 하계학술대회 논문집 Vol.5 No.2
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    • pp.1234-1238
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    • 2004
  • A Controlled neural networks are proposed in order to measure nonlinear environments in adaptive and in realtime. The structure of it is similar to recurrent neural networks: a delayed output as the input and a delayed error between tile output of plant and neural networks as a bias input. In addition, we compute the desired value of hidden layer by an optimal method instead of transfering desired values by backpropagation and each weights are updated by RLS(Recursive Least Square). Consequently, this neural networks are not sensitive to initial weights and a learning rate, and have a faster convergence rate than conventional neural networks. This new neural networks is Error Estimated Neural Networks. We can estimate nonlinear models in realtime by the proposed networks and control nonlinear models. To show the performance of this one, we have various experiments. And this controller call prove effectively to be control in the environments of various systems.

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모션 라이더를 위한 시각 시뮬레이션 시스템의 개발 (Development of a Visual Simulation System for the Motion Rider)

  • 권정훈;권영웅
    • 한국공작기계학회논문집
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    • 제14권5호
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    • pp.55-61
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    • 2005
  • In this paper, we propose the visual simulation system for virtual reality motion rider system. The visual simulation system can apply verity virtual reality system. This paper deals with programs on 3D automatic creation of terrain, road design, and a realtime rendering program for the virtual reality system. For the 3D automatic creation of terrain, DEM data and rectangular grid method are applied. We can make two different road object with the road design program. One of them includes road definition, and the other is obtained by using 'NURBS curve.' Visual simulation is consisted by additional modeling and real-time rendering. We can apply the programs made in this way to visual system of driving simulator.

Applying Formal Methods to Modeling and Analysis of Real-time Data Streams

  • Kapitanova, Krasimira;Wei, Yuan;Kang, Woo-Chul;Son, Sang-H.
    • Journal of Computing Science and Engineering
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    • 제5권1호
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    • pp.85-110
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    • 2011
  • Achieving situation awareness is especially challenging for real-time data stream applications because they i) operate on continuous unbounded streams of data, and ii) have inherent realtime requirements. In this paper we showed how formal data stream modeling and analysis can be used to better understand stream behavior, evaluate query costs, and improve application performance. We used MEDAL, a formal specification language based on Petri nets, to model the data stream queries and the quality-of-service management mechanisms of RT-STREAM, a prototype system for data stream management. MEDAL's ability to combine query logic and data admission control in one model allows us to design a single comprehensive model of the system. This model can be used to perform a large set of analyses to help improve the application's performance and quality of service.