• Title/Summary/Keyword: Systems Engineering(SE)

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Fabrication and characterization of optoelectronic device using CdSe nanocrystal quantum dots/single-walled carbon nanotubes (카드뮴 셀레나이드 양자점과 단일벽 탄소나노튜브로 구성된 이종 나노 소재를 기반으로 한 광전소자의 제작 및 특성평가)

  • Shim, Hyung-Cheoul;Jeong, So-Hee;Han, Chang-Soo;Kim, Soo-Hyun
    • Journal of Sensor Science and Technology
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    • v.19 no.2
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    • pp.160-167
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    • 2010
  • In this paper, we fabricated the optoelectronic device based on Cadmium selenide(CdSe) nanocrystal quantum dots (NQDs)/single-walled carbon nanotubes(SWNTs) heterostructure using dieletrophoretic force. The efficient charge transfer phenomena from CdSe to SWNT make CdSe-Pyridine(py)-SWNT unique heterostructures for novel optoelectronic device. The conductivity of CdSe-py-SWNT was increased when it was exposed at ultra violet(UV) lamp, and varied as a function of wavelength of incident light.

A Process Model for the Systematic Development of Safety-Critical Systems (안전중시 시스템을 위한 체계적인 설계 프로세스에 관한 연구)

  • Yoon, Jae-Han;Lee, Jae-Chon
    • Journal of the Korea Safety Management & Science
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    • v.11 no.3
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    • pp.19-26
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    • 2009
  • It is becoming more and more important to develop safety-critical systems with special attention. Examples of the safety-critical systems include the mass transportation systems such as high speed trains, airplanes, ships and so forth. Safety critical issues can also exist in the development of atomic power plants that are attracting a great deal of attention recently as oil prices are sky-rocketing. Note that the safety-critical systems are in general large-scale and very complex for which case the effects of adopting the systems engineering (SE) approach has been quite phenomenal. Furthermore, safety-critical requirements should necessarily be realized in the design phase and be effectively maintained thereafter. In light of these comments, we have considered our approach to developing safety-critical systems to be based on the method combining the systems engineering and safety management processes. To do so, we have developed a design environment by constructing a whole life cycle model in two steps. In the first step, the integrated process model was developed by integrating the SE (ISO/IEC 15283) and systems safety (e.g., hazard analysis) activities and implemented in a computer-aided SE tool environment. The model was represented by three hierarchical levels: the life-cycle level, the process level, and the activity level. As a result, one can see from the model when and how the required SE and safety processes have to be carried out concurrently and iterately. Finally, the design environment was verified by the computer simulation.

A study on the Improvement Direction of Design Phase Entry Criteria Review for Naval Surface Ships & Onboard Weapon Systems R&D Project (함정 및 함정탑재 무기체계 연구개발사업의 설계단계 진입조건 검토 개선 방향)

  • Kwang Yong Hwang;Dong Myung Seol;Bong Wan Choi
    • Journal of the Korean Society of Systems Engineering
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    • v.19 no.1
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    • pp.79-90
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    • 2023
  • In principle, R&D of general weapons systems are led by companies or government-funded organizations. In terms of project execution, the defense R&D planning system was reorganized to conduct SE-based project management by integrating the naval ship project execution procedure into the general weapon system R&D procedure. The development progress was confirmed according to the guide for SE application of DAPA, and a technical review meeting was proposed to enter into the each next phase in the R&D process. This paper focuses on improvement for technical review in terms of technical management based on system engineering for R&D mounted weapon systems and the naval surface ship project in preliminary design and detailed design. So, the improvement direction for reviewing the entry criteria for the R&D weapons systems of the naval ship and mounted weapons is proposed.

A case on the Evaluation of the Effectiveness of Model based Configuration Management System for Small/ Medium-Sized Plant (모델 기반 중소형 플랜트 형상관리 시스템의 효과성 평가 사례)

  • Ha, Ga Yeon;Kim, Jinil;Shin, Junguk;Yeom, Choong Sub
    • Journal of the Korean Society of Systems Engineering
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    • v.17 no.1
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    • pp.107-113
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    • 2021
  • Plant Configuration Management(CM) is an activity to maintain consistency of design requirements, physical configuration, facility configuration information throughout the life cycle of the plant by systematically managing changes that occur during the plant design and operation process. Conformity between information must be ensured not only in the design stage, but also in the case of design changes in the operation and maintenance stages, and thus a computer system capable of efficiently managing them is required. In particular, in consideration of an application to small and medium-sized domestic plants, a computer system that can support configuration management at a low cost is needed. Accordingly, in this study, a configuration management system has been developed to support the management of plant design information and change procedures in the operation stage of small and medium-sized plants. Here, a case for quantitatively evaluating the effectiveness of the developed system is described.

Application of Systems Engineering for Improving the Design Process of Public Halls (공공 홀의 설계 프로세스 향상을 위한 시스템 엔지니어링 적용)

  • Yoshihara, Saki;Toma, Tetsuya
    • Journal of the Korean Society of Systems Engineering
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    • v.11 no.2
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    • pp.115-124
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    • 2015
  • The major challenge of designing public halls or performing arts centers in Japan is meeting the expectations of the regional community; greater stakeholder involvement is required in order to solve this problem. The purpose of this paper is to examine whether stakeholders can become more involved in public hall design by using systems engineering (SE), which has never before been applied when designing public halls. As such, this study redesigned an actual public hall (Iwaki Alios) using an SE approach. The results revealed that applying SE was effective in the creation of a public hall concept.

A Study on the Application System of the Systems Engineering for the Railway Total Safety Project (철도종합안전프로젝트를 위한 시스템엔지니어링 적용 체계 연구)

  • Choi Yo-Chul;Cho Yun-Ok
    • Journal of the Korean Society for Railway
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    • v.9 no.4 s.35
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    • pp.487-492
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    • 2006
  • This paper presents the Case of Systems Engineering Application for the Railway Total-Safety Project. Key points to consider for project are: 1) Establish the SE Based-Project organization system, 2) Define the SE Activities, 3) Manage technically the SE Based-Project, etc. They were of much help that the Railway Total-Safety Project which were efficiently implemented and managed. As I take it, the Systems Engineering is very reasonable approach for the systematical and technical conduct of a project.

SE Case Study in Eagle Acquisition Program (독수리구매사업 시스템엔지니어링 적용사례)

  • Lee, Hi-Jang;Lee, Dong-Seok;Ham, Hyuck-Sang;Rho, Kyun-Hyup;Kwon, Young-Hoon
    • Journal of the Korean Society of Systems Engineering
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    • v.3 no.2
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    • pp.9-16
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    • 2007
  • To Manage the Defense Acquisition Process more efficiently, DAPA has looked over the applying SE process to the Eagle Acquisition Program. Based on comparing 'Requirement' with 'items suggested in the proposal' in RFP and analyzing the result by using Cradle, those items have been discovered with IPT, actualized and corrected. In addition, the computerized data base system makes easier to trace all changed and more efficiency to manage programs. Therefore, this study using SE in other acquisition program.

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A Study on the Analysis of SE Process Implementation for the Light Rail Transit Project (경량전철사업의 시스템엔지니어링 적용 실태분석 연구)

  • Kim, Chul Whan;Han, Myeung-Duk;Lee, Jae Hong
    • Journal of the Korean Society of Systems Engineering
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    • v.8 no.2
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    • pp.1-10
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    • 2012
  • This paper aims to analyze the result of SE Process Implementation on Light Rail Transit(LRT) Project. Currently the Light Rail Transit Project of Korea applies SE to the intermediate phase, that is, E&M phase which is a manufacturing and designing procedure. More seriously, the application effect of SE is not remarkable because it applies to some specific engineering fields like RAMS and it depends on superficial consulting of foreign companies with low SE support capability and investment capital. This study points out that the "Requirement Analysis" and "System Alternative Review" has not been conducted from the initial phase (basic plan and basic design) of the LRT projects. Several projects indicate that the amount of investments for SE activities through the Korea LRT project is relatively very small in comparison with the global capital which is about 10% of total project budget. Furthermore, Korea LRT projects have very few SE professionals and weak SE organization with no government directions and guide book for the efficient implementation of SE for the LRT projects.

Concept Selection of NPP Construction Delay Risk Assessment Methodology Using Systems Engineering Approach

  • Hossen, Muhammed Mufazzal;Kang, Sunkoo;Jung, JC;Kim, Jonghyun
    • Journal of the Korean Society of Systems Engineering
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    • v.11 no.1
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    • pp.9-24
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    • 2015
  • Construction industry faces a lot of inherent uncertainties and issues and the construction phase of nuclear power project is not free from this risk. This paper investigates promising methodologies to be used on nuclear power plant (NPP) construction schedule delay risk assessment by using entry level systems engineering approach. This study contains how the initial concept for the risk assessment methodology has been developed. In this point of view, this work structured on three main phases: needs analysis (NA), concept exploration (CE), and concept definition (CD) through systems engineering (SE) approach. Traditionally, the SE process is applied to technical development programs but this study opens up a new avenue that SE can also be successfully applied to the development and optimization of the risk assessment model. This study provides a rational and systematic process for developing and selecting the best risk assessment model. This paper selects analytic hierarchy process (AHP) method to assess NPP construction schedule delay risk for international project. As conclusion, the proposed concept and selected method can discriminate successfully and clearly among schedule delay risk assessment methods.