• 제목/요약/키워드: Block Diagram

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DEVS 형식론 기반의 Dynamic Reliability Block Diagram과 GPU 가속 기술을 이용한 신뢰도 분석 방법 (GPU-accelerated Reliability Analysis Method using Dynamic Reliability Block Diagram based on DEVS Formalism)

  • 하솔;구남국;노명일
    • 한국시뮬레이션학회논문지
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    • 제22권4호
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    • pp.109-118
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    • 2013
  • 전통적으로 신뢰도 분석에 사용되는 Fault Tree Analysis의 경우 관련 분야의 전문가가 필요하고 작성자의 판단에 따라 신뢰도 분석 결과가 달라진다. 반면, Reliability Block Diagram의 경우 시스템 구성도나 Process Flow Diagram (PFD), Piping and Instrument Diagram (P&ID)을 기반으로 하기에 작성에 필요한 비용과 시간이 절감되는 장점이 있다. 본 논문에서는 Dynamic Reliability Block Diagram과 이산 사건 시뮬레이션에 널리 사용되는 DEVS 형식론을 이용하는 신뢰도 분석 방법을 제안한다. 또한 시스템 모델링 방법론 중 하나인 System Entity Structure/Model Base의 개념을 도입함으로써 다양한 설계 대안에 대한 신뢰도 분석 모델을 자동으로 생성할 수 있도록 하였다. 그리고 Reliability Block Diagram을 이용한 신뢰도 분석 시 오래 소요되는 계산 시간을 단축시키기 위해 GPU 가속 기술을 신뢰도 분석 시뮬레이션에 접목하였다.

Y Block Diagram as a New Process Notation in a GPS Manufacture

  • Lee, Jung-Gyu;Jeong, Seung Ryul
    • 인터넷정보학회논문지
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    • 제20권1호
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    • pp.125-133
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    • 2019
  • Company A should maintain myriad conversion tools for the purpose of making a geometric compilation of navigation maps. Company A is already using complex compilation tools, which are tailored to geographical areas and various GPS models. However, due to frequent requirement and personnel changes, there is an endless challenge for perfect tool configuration and multiple map consolidation. To solve this problem, Company A launched a process automation project using Graphviz, which is an open source workflow graph visualization software. Before implementation, they had to document their current map compilation processes and then match it with the applicable conversion tool. For effective representation of process controls, a new graphical process notation is designed, i.e. Y Block diagram. The authors will compare Y Block diagram with other process notations and explain why Y Block diagram is more useful for tool based business processes such as digital map generation processes.

팩토링 기법을 이용한 신뢰성 구조도의 신뢰도 계산 알고리즘 (A Reliability Computational Algorithm for Reliability Block Diagram Using Factoring Method)

  • 이창훈;김명규;이상천
    • 대한산업공학회지
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    • 제20권3호
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    • pp.3-14
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    • 1994
  • In this study, two reliability computational algorithms which respectively utilize a factoring method are proposed for a system represented by reliability block diagram. First, vertex factoring algorithm is proposed. In this algorithm, a reliability block diagram is considered as a network graph with vertex reliabilities. Second algorithm is mainly concerned with conversion of a reliabilities block diagram into a network graph with edge reliabilities. In this algorithm, the independence of edges is preserved by eliminating replicated edges, and in computing the reliability of a converted network graph, existing edge factoring algorithm is applied. The efficiency of two algorithms are compared for example systems with respect to computing times. The results shows that the second algorithm is shown to be more efficient than the first algorithm.

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시이퀀스 제어계통의 설계법 (A Method of Design for Sequential Control Systems)

  • 황창선
    • 전기의세계
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    • 제18권6호
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    • pp.33-45
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    • 1969
  • The purpose of this paper is design the most important part of sequential control systems, that is, command-treatment part, from the signal-transformation point of view. An orderly procedure is developed by which for sequential control systems the experimental design method can be reduced to the rational design method. Important in this procedure are: 1. To make total block diagram of sequential control systems by determining input and output signals of command-treatment part. 2. To partition over-all block diagram by observing each output signal. 3. To design concretely minimum block diagram by using the operational block diagram. By applying the method for partitioning the circuit to the design, the design method for sequential control systems is organized and done rationally without the aid of experiece.

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Automation of block assignment planning using a diagram-based scenario modeling method

  • Hwang, In Hyuck;Kim, Youngmin;Lee, Dong Kun;Shin, Jong Gye
    • International Journal of Naval Architecture and Ocean Engineering
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    • 제6권1호
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    • pp.162-174
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    • 2014
  • Most shipbuilding scheduling research so far has focused on the load level on the dock plan. This is because the dock is the least extendable resource in shipyards, and its overloading is difficult to resolve. However, once dock scheduling is completed, making a plan that makes the best use of the rest of the resources in the shipyard to minimize any additional cost is also important. Block assignment planning is one of the midterm planning tasks; it assigns a block to the facility (factory/shop or surface plate) that will actually manufacture the block according to the block characteristics and current situation of the facility. It is one of the most heavily loaded midterm planning tasks and is carried out manually by experienced workers. In this study, a method of representing the block assignment rules using a diagram was suggested through analysis of the existing manual process. A block allocation program was developed which automated the block assignment process according to the rules represented by the diagram. The planning scenario was validated through a case study that compared the manual assignment and two automated block assignment results.

단위 모듈 기반의 하드웨어 중복구조 신뢰도 분석 도구 개발 (Development of Reliability Block Diagram Analysis Tool for H/W Redundancy Structure based on Unit Module)

  • 김성수;박상혁;김성환;최기영;하철근;박춘배
    • 한국항공우주학회지
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    • 제37권6호
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    • pp.595-601
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    • 2009
  • 높은 신뢰도를 요구하는 비행제어 시스템은 복잡한 중복구조로 구성된다. 이러한 중복 구조는 시스템의 내고장성(fault tolerant)을 향상시킬 수 있다. 따라서 시스템 설계자는 다양하게 구성될 수 있는 중복구조의 정량적 데이터를 바탕으로 적절한 구조를 선택할 수 있다. 본 논문에서는 중복구조의 특징을 분석하고 신뢰도 해석을 위해 필요한 수학적 모델을 정의하였다. 이렇게 정의된 해석 모델을 적용하여 Simulink 블록 기반의 Reliability Block Diagram 해석 도구를 구성하고, 상용으로 사용되고 있는 도구를 이용하여 분석도구의 타당성을 검증하였다.

신뢰도 경로의 고장열거를 이용한 시스템 신뢰도 계산방법 연구 (Study on a System Reliability Calculation Method Using Failure Enumeration of Reliability Path)

  • 이장일;박기준;천환규;정충민;신동준;서명원
    • 대한기계학회논문집A
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    • 제35권6호
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    • pp.629-633
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    • 2011
  • 항공기, 철도, 선박과 같은 대형 시스템들은 전기, 기계적으로 매우 복잡한 구조를 가졌으며 부품의 수명만을 고려한 기존의 유지보수에서 탈피하여, 고장분석의 시스템화를 통해 장치의 고유수명과는 관계없이 발생 가능한 우발고장도 대처할 수 있는 신뢰성 기반의 유지보수체계를 연구하여야 한다. 본 연구에서는 선행연구로 필요한 복합 시스템의 신뢰도 계산방법에 관한 연구이다. 복합 시스템의 신뢰도를 효과적으로 계산하기 위해 시스템의 RBD(Reliability Block Diagram)를 구성하고 인접행렬을 사용하여 RBD(Reliability Block Diagram)를 행렬로 표현한다. 또한 RBD(Reliability Block Diagram)행렬을 통하여 신뢰도 경로행렬과 고장열거 행렬을 구성하여 시스템의 신뢰도를 계산한다. 본 연구에서 제안한 알고리즘은 자동화, 시스템화가 가능하며 현재 개발하고 있는 신뢰도 정보관리 시스템 및 신뢰성 기반 유지보수 시스템에서 활용될 것이다.

웹 기반 RBD 구현 및 신뢰도 평가기술 (Embodying RBD and Reliability Analysis Technology base on Web)

  • 송준엽;이승우;이후상;조복기
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2003년도 춘계학술대회 논문집
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    • pp.1541-1544
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    • 2003
  • In this study, embodying reliability block diagram based on the web and reliability analysis technology are developed. RBD(reliability Block Diagram) represents the functional relation between elements in any product. Among relations between elements. there are serial, parallel, bridge, and stand by, etc. Advantages of developed system are integrated datum about reliability (NPRD, EPRD, MIL-HDBK 217F, NSWC. OREDA. Bellcore, and domestic institutes & companies datum). graphic user interface for convenience, and the various service analyzes the failure history data of parts.

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자바 애플릿을 이용한 블록 다이어그램식 GUI 개발 (Development of a Block-diagram type GUI in JAVA Applet)

  • 황성환;한형석;이재경;김동성
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2003년도 춘계학술대회 논문집
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    • pp.1751-1754
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    • 2003
  • Due to advances in information technology, even Engineering Simulations can now be performed in web-based JAVA through an integrated operating system called Virtual Machine and the use of byte code, which guarantees the compatibility of identical codes in every computing system and makes it suitable for web-based simulation system development. This paper introduces an implementation embodied in JAVA Applet that allows a block-diagram type GUI that runs in a web browser for use in the dynamics simulation modeling of powertrains of vehicles and multi-body systems. This system is not restrained by any of the H/W and S/W in the user's computer, so that it has the advantage of providing a GUI that allows web-based block-diagram type modeling.

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