• 한국철도학회논문집
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• 제7권4호
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• pp.356-359
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• 2004

In this paper, as the first step to assess and enhance the reliability of Korea High Speed Train, auxiliary power system is selected and reliability analysis is carried out. The auxiliary power system is classified into subsystems and functional analysis is conducted. Reliability block diagrams are drawn and reliability parametric analysis is performed. Analysis results show that the reliability of auxiliary power system depends on critical items. To grow the system reliability, activities should be concentrated on improvement of critical items.

• 한국철도학회논문집
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• 제3권3호
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• pp.147-153
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• 2000

The train control and monitoring system (TCMS) is an on board computer system in railway vehicles performing the control, supervisory and diagnostic functions of the complete train system. This system replaces a lot of hard-wired relays and minimizes the necessary vehicle wiring thus increasing the reliability of the train. It is also one of more important equipment on vehicle to implement much higher safety and reliability train system. We studied a software design technique of TCMS using a CASE tool that is a kind of safety critical software engineering tool (SCADE). This tool has mainly four functions such as the graphical editor, the document maker, tile automatically code generator, and the test simulator. The several functions of TCMS are implemented in this software easily programmed using a functional block diagram and a graphic programming language. We applied to automatically generated TCMS modules on the SCADE each functional block for the Standard type EMU in Korea. We performed the combination test using TCMS simulator and the running test in Seoul subway 7 Line. We proved that this technique is more useful for the software design of TCMS in urban transit

• 한국산업융합학회 논문집
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• 제22권6호
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• pp.785-795
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• 2019

This paper is a study on the modeling of the quantity estimation model for offshore plant Material handling equipment in FEED(Front End Engineering Design) verification stage using system engineering approach which is an engineering design methods. The relevant engineering execution procedure is not systemized although the operation method and Material handling equipment selection with weight and space constraints is a key part of the FEED. Using the system engineering process, the stakeholder requirements analysis process, the system requirements analysis, and the final system architecture design were sequentially performed, and the process developed through the functional development diagram and Requirement traceability matrix (RTM) was verified. In addition, based on the established process, we propose a Material handling quantity estimation model and Quantity calculation verification Table that can be applied at the FEED verification stage and we verify the applicability through case studies.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2007년도 춘계학술대회 논문집
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• pp.45-57
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• 2007

During the design phase of a system, which requires high reliability and safety such as aircraft, high speed train and nuclear power plant, reliability engineer must set up the target system reliability. To meet a reliability goal for the system, reliability allocation should be done gradually from the system to its element. For this end, first of all, we need to construct functional block diagram based on the design output and PWBS(Project Work Breakdown System). Another important input data for reliability allocation is the relationship between the cost and the reliability. In this study we investigate various reliability allocation models, which can be applicable to aircraft, vehicle, and power plant, and etc. And we suggest a proper reliability allocation model which can be effectively applicable to KTX-II high speed train to achieve the target system reliability.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 1999년도 가을 학술발표논문집 Vol.26 No.2 (3)
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• pp.36-38
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• 1999

하드웨어의 제품 사양에는 제품의 특징, FBD(Functional Block Diagram), 핀의 기능 및 배열, 프로그래밍 모드 및 각 블록의 기능 등이 함께 제시된다. 이 때 다른 사양과는 달리 설계 초기 단계부터 설정되는 가장 개념적인 FBD는 마이크로프로세서의 경우 메모리 인터페이스, 레지스터 파일, 데이터패스, 예외처리기, 각종 제어기, 타이머 등으로 구성된다. FBD의 각 블록들은 여러 명의 설계자들에게 분할되고 이 중 마이크로프로세서 설계의 대부분의 시간을 소비하게 되는 각종 제어기의 설계는 여러 블록이 공동으로 제어 신호를 공유하게 된다. 이 신호에 의해 전체 시스템의 정확성(correctness)이 결정되므로 제어기예서 각 블록에 공급하는 제어 신호는 적절할 타이밍에 정확한 값을 가져야만 한다. 따라서 본 논문은 마이크로프로세서에서의 각 블록에 공급하는 제어 신호는 적절한 타이밍에 정확한 값을 가져야만 한다. 따라서 본 논문은 마이크로프로세서의 FBD를 모델링할 수 있는 시각도구를 제안함으로써 제어 신호에 따른 전체 블록의 유기적인 데이터 흐름을 한 눈에 파악할 수 있도록 한다. 이는 설계초기부터 각 블록들을 설계하는 설계자들간의 공통의 다이어그램인 FBD를 중심으로 설계를 해나감으로써 대화 오류를 감소시키고 제어신호 디버깅을 용이하게 하여 설계시간을 단축시키는 것을 목표로 한다.

• 산업경영시스템학회지
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• 제30권1호
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• pp.1-7
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• 2007

This paper addresses a the maintenance system based on the concept of RAMS (Reliability, Availability, Maintenance, Safety) for the effective maintenance of the urban transit. A systematic approach for developing a cost-effective maintenance strategy based on the component reliability of the system in question is performed according to the following steps : definition of function, functional failures of the systems, construction of RBD (Reliability Block Diagram), and the calculation of reliability indices. The developed preventive maintenance system generates maintenance plan and repair request based on the analysed RAMS data of components and maintenance experience.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 1995년도 VTS and IBS 95 The Korean Institute of Navigation 1995년도
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• pp.55-66
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• 1995

Earlier studies indicated clearly that information obtained from conventional statistics cannot provide guidance on detailed casualty analysis. Much more is needed if casualty statistics are to play a proficient and vigorous role in encouraging safety. Specific difficulties originate from making the causal relationships clear. Fault tree analysis and symbolic modeling of functional block diagram are an efficient aid in safety analysis so that these methods are generally used in other industries. This paper describes the application of these tools in shipping casualties and how to evaluate the relationships between different causes of ship casualties. Thesee methods are proved to be an efficient and useful tools to indicate the relationships between individual physical factors. In addition these models permit easy understanding and recognition of the factors leading to individual casualty

• 한국철도학회논문집
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• 제10권3호
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• pp.319-326
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• 2007

During the design phase of a system, which requires high reliability and safety such as aircraft, high speed train and nuclear power plant, reliability engineer must set up the target system reliability. To meet a reliability goal for the system, reliability allocation should be done gradually from the system to its element. For this end, first of all, we need to construct functional block diagram based on the design output and PWBS(Project Work Breakdown System). Another important input data for reliability allocation is the relationship between the cost and the reliability. In this study we investigate various reliability allocation models, which can be applicable to aircraft, vehicle, and power plant, and etc. And we suggest a proper reliability allocation model which can be effectively applicable to KTX-II high speed train to achieve the target system reliability.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2001년도 춘계학술대회논문집C
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• pp.333-338
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• 2001

Fault tree is a widely used methodology for analyzing product reliability. The fault trees are usually constructed using the experiences of expert reliability engineers in top-down approaches and have different structures according to each expert's subjectivity. In this work it is tried to find a general method for the fault tree construction based on the function tree that is the result of product function deployment. Based on the function tree, the method has the advantage of resulting an objective fault tree since the faults are defined as the opposite concept of functions. The fault tree construction of this work consists of the following steps: 1) definition of product primary function with the viewpoints of product operation and configuration, 2) construction of functional relation chart using a grouping algorithm, 3) abstraction of functional block diagram according to operation sequences and configuration of a product, 4) construction of function tree for each viewpoint, and 5) construction of fault tree by matching the function tree and simplification of the result.

• 한국항해학회지
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• 제25권2호
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• pp.97-106
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• 2001

이 연구는 항만교통정보센터의 시스템 확충 및 연안 선박교통관리제도의 도입에는 많은 비용이 소요되기 때문에 비용과 편익을 비교하여 타당성을 조사하고자 한다. 따라서 비용과 편익을 분석하는데 중요한 기초자료가 되는 사고예방효과를 추정하고자 한다. 추정의 방법은 거제해역에서 발생한 해양사고를 분석하여 원인요소를 도출한 후 이를 설문문항으로 구성하여 항만교통정보센터의 운영요원을 대상으로 설문을 실시한다. 연안 선박교통관리제도의 도입에 의한 사고예방효과는 충돌사고에서 55.572%, 좌초사고에서 51.667%로 추정되었다. 또한 인적요소와 환경요소에 의한 효과는 높지만 기술적 요소에 의한 효과는 미미한 것으로 분석되었다.