• Title, Summary, Keyword: Systems analysis

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A study of data acquisition system of defense analysis & evaluation by systems engineering process (시스템엔지니어링 프로세스에 의한 국방 분석평가자료 수집체계 연구)

  • Min, Sungki;Choi, Soonhwang
    • Journal of the Korea Society of Systems Engineering
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    • v.1 no.2
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    • pp.69-76
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    • 2005
  • Defense analysis & evaluation includes menace analysis, validation analysis, problem analysis, scientific technical analysis, technical trade-off analysis, alternative analysis, cost analysis, etc. Reliable related data is required to perform these analysis activities efficiently. but in case of these defense analysis & evaluation data acquisition system, the data is insufficient and scattered about each organization. The data of database system is also not utilized sufficiently. Abroad technical data is also low level data such as catalog or military officer's collection. Therefore, this paper propose defense analysis & evaluation data acquisition system by systems engineering process. we also propose construction method of data acquisition system.

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A Study on the Validation Methodology of Network Analysis Applications in Energy Management Systems (계통운영시스템 계통해석 프로그램 검증 방안에 관한 연구)

  • Cho, Yoon-Sung
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.28 no.10
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    • pp.27-36
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    • 2014
  • Network analysis applications in energy management systems play a key role in the economic and reliable operation of power systems. In order to provide operators with useful network information, the accurate results of topology processing, state estimation, power flow, and contingency analysis must be simulated. This paper proposes a validation methodology of network analysis applications in energy management systems. The energy management systems was checked to ensure that it meets the originally specified functions based on the proposed methodology. In addition, the performance of state estimation is evaluated with the reference of the proposed methodology. The proposed methodology is being conducted by energy management systems and the Korean power systems have been utilized for the test systems.

Fault Tree Analysis and Failure Mode Effects Analysis for Software Security Improvements in Mobile Banking Information Systems (모바일 뱅킹 정보시스템의 소프트웨어 보안성 개선을 위한 고장 트리 분석과 고장 유형 영향 분석)

  • Kim, So Young;Kim, Myong Hee;Park, Man-Gon
    • Journal of Korea Multimedia Society
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    • v.18 no.11
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    • pp.1342-1350
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    • 2015
  • Due to rapid development of mobile device technologies, the mobile banking through Internet has become a major service of banking information systems as a security-critical information systems. Recently, lots of mobile banking information systems which handle personal and transaction information have been exposed to security threats in vulnerable security control and management processes, mainly software systems. Therefore, in this paper, we propose a process model for software security improvements in mobile banking information system by application of fault tree analysis(FTA) and failure modes and effects analysis(FMEA) on the most important activities such as 'user authentication' and 'access control' and 'virus detection and control' processes which security control and management of mobile banking information systems are very weak.

A Study on the Enhancement of Accuracy of Network Analysis Applications in Energy Management Systems (계통운영시스템 계통해석 프로그램 정확도 향상에 관한 연구)

  • Cho, Yoon-Sung
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.29 no.12
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    • pp.88-96
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    • 2015
  • This paper describes a new method for enhancing the accuracy of network analysis applications in energy management systems. Topology processing, state estimation, power flow analysis, and contingency analysis play a key factor in the stable and reliable operation of power systems. In this respect, the aim of topology processing is to provide the electrical buses and the electrical islands with the actual state of the power system as input data. The results of topology processing is used to input of other applications. New method, which includes the topology error analysis based on inconsistency check, coherency check, bus mismatch check, and outaged device check is proposed to enhance the accuracy of network analysis. The proposed methodology is conducted by energy management systems and the Korean power systems have been utilized for the test systems.

Integration of Systems Engineering and System Safety Analysis for Developing CBTC System (CBTC 시스템 개발을 위한 시스템엔지니어링과 안전성 분석의 통합)

  • 박중용;박영원
    • Journal of the Korean Society for Railway
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    • v.6 no.1
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    • pp.1-9
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    • 2003
  • This article proposes an integrated systems engineering and safety analysis model for safety-critical systems development. A methodology in system design for safety is considered during the early phase of the development life cycle of systems engineering process. The evolution of the design automation technology has enabled engineers to perform the model-based systems engineering. A Computer-Aided Systems Engineering(CASE) tool, CORE, is utilized to integrate the systems engineering model with a system safety analysis model. The results of the functional analysis phase can drive the analysis of the system safety. An example of Communications-Based Train Control(CBTC) system for an Automated Guided Transit(AGT) system demonstrated an application of the integrated model.

On the Development of Systems Safety Requirements Using Hazard Analysis Results (위험원 분석 결과를 반영한 시스템 안전 요구사항 생성에 관한 연구)

  • Kim, Jae-Chul;Lee, Jae-Chon
    • Journal of the Korea Safety Management & Science
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    • v.13 no.4
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    • pp.9-16
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    • 2011
  • Modern systems become more complex and the demand for systems safety goes up sharply. Thus, the proper handling of the safety requirements in the systems design is getting greatly increased attention these days. Hazard analysis has been one of the active areas of research in connection with systems safety. In this paper, we study a subject on how the hazard analysis results can be incorporated in the systems design. To this end we set up a goal on how to systematically generate safety requirements that should reflect hazard analysis results and be implemented in the systems design and development. To do so, we first review the process for systems design and suggest the associated Model. Then the process and results of hazard analysis are analyzed and Modeled particularly with emphasis on the safety data. The resulting data Model incorporating both the hazard analysis and system life cycle is used in the generation of safety requirements. Based on the developed data Model, the generation of the requirements, the construction of requirements DB, and the change management later on is demonstrated through the use of a computer-aided software tool.

Dynamic analysis of electromechanical system (기전 시스템의 동역학 해석)

  • 김진식;박정훈;임홍재
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.1113-1118
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    • 2004
  • This paper presents the dynamic analysis method for an electromechanical system. The engineer has at his disposal a variety of software simulation tools. However, difficulties arise when the study of the behavior of complex electromechanical systems in combination with coupling element is required. Typical examples of such systems are machines for factory automation, home automation, and office automation. Dynamic systems analysis packages or electronic systems analysis packages offer the restrictive to simulate these mixed systems such electromechanical product. Electronic circuit analysis algorithm is easily incorporated into a multi-body dynamics analysis algorithm. The governing equation of electronic circuit is formulated as a differential algebraic equation form including both electrical and mechanical variables and is simultaneously solved in every time step. This analysis method clearly demonstrates the application potential for mixed electromechanical simulation.

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Safety Analysis and Design Model for a Complex System like ATM(Air Traffic Management) System (ATM(Air Traffic Management) 시스템과 같은 복잡 시스템의 안전 분석 및 설계 모델)

  • Park, Joong-Yong
    • Journal of the Korea Society of Systems Engineering
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    • v.3 no.1
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    • pp.27-31
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    • 2007
  • A complex system like ATM(Air Traffic Management) has safety problem emerging from complex interactions between systems. In complex systems, malfunctions of components are not the only causes of critical accidents. To resolve this problem many researchers have proposed new safety analysis models for complex systems. This research is a way of improving safety analysis model focusing on systems engineering design model for ATM.

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Design of Economic Analysis Module for Waste Heat Recovery based on Systems Engineering Approach (시스템엔지니어링 기반 산업 폐열 발전시스템 경제성 분석 모듈 설계)

  • Kim, Joon Young;Cha, Jae Min;Park, Sung Ho;Shin, Jung Uk;Lee, Tae Kyong
    • Journal of the Korea Society of Systems Engineering
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    • v.14 no.1
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    • pp.1-12
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    • 2018
  • In the energy-guzzling industries such as steel making and cement, power plants utilizing waste heat have been attracting attention to increase energy efficiency. However, the existing economic analysis system doesn't consider the special working fluids and the cost models of the main equipment used in the waste heat recovery power plant. So it is difficult to estimate the plant economics accurately. Therefore, It is required to develop a economic analysis module that can more accurately evaluate for the power plant. In this study, the systems engineering approach was used to design and develop the module that systematically reflects the characteristics of the power plant and various requirements. Specifically, first, the special working fluids and main equipment applied to the power plant were investigated. Next, the cost models for each equipment were developed. Finally, the economic analysis module based on this was developed.

Mismatching Problem between Generic Pole-assignabilities by Static Output Feedback and Dynamic Output Feedback in Linear Systems

  • Kim Su-Wood
    • International Journal of Control, Automation, and Systems
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    • v.3 no.1
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    • pp.56-69
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    • 2005
  • In this paper, it is clearly shown that the two well-known necessary and sufficient conditions mp n as generic static output feedback pole-assignment and mp + d(m+p) n+d as generic minimum d-th order dynamic output feedback pole-assignment on complex field, unbelievably, do not match up each other in strictly proper linear systems. For the analysis, a diagram analysis is newly created (which is defined by the analysis of 'convoluted rectangular/dot diagrams' constructed via node-branch conversion of the signal flow graphs of output feedback gain loops). Under this diagram analysis, it is proved that the minimum d-th order dynamic output feedback compensator for pole-assignment in m-input, p-output, n-th order systems is quantitatively decomposed into static output feedback compensator and its associated d number of arbitrary 1st order dynamic elements in augmented (m+d)-input, (p+d)-output, (n+d)-th order systems. Total configuration of the mismatched data is presented in a Table.