• Title/Summary/Keyword: Analysis

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Structural Analysis on the Leaflet Motion Interacted with Blood Flow for Thickness Minimization Design of a Bileaflet Mechanical Heart Valve (기계식 인공심장판막의 경량화 구조설계를 위한 혈액유동과 상호작용하는 판막거동의 구조역학적 특성연구)

  • 권영주;방혜철;김창녕
    • Korean Journal of Computational Design and Engineering
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    • v.6 no.1
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    • pp.59-68
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    • 2001
  • This paper investigates the structural analysis and design of mechanical heart valve through the numerical analysis methodology. In a numerical analysis methodology application to the thickness minimization structural design of mechanical heart valve, fluid analysis is performed for the blood flow through a bileaflet mechanical heart valve. Simultaneously the kinetodynamic analysis is carried out to obtain the appropriate structural condition for the structural analysis. Thereafter the structural static analysis is also carried out to confirm the thickness minimization structural condition(minimum thickness shape of leaflet).

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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)

  • Choe, Sun-Hwang;Min, Seong-Gi
    • 시스템엔지니어링워크숍
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    • s.4
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    • pp.135-140
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    • 2004
  • Defense analysis & evaluation includes menace analysis, validation analysis, problem analysis, scientific technical analysis, technical trad-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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RISK ANALYSIS OF FOREIGN DIRECT INVESTMENTS IN INNOVATIVE PROJECTS: CASE OF UZBEKISTAN

  • Lutfullaevich, Yoziev Golibjon
    • Asia Pacific Journal of Business Review
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    • v.5 no.1
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    • pp.11-19
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    • 2020
  • This study is a review on Risk analysis of foreign direct investments in innovative projects of Uzbekistan. The study will examine SWOT and PESTL analysis as an effective situation analysis tool which plays an important role in the fields of management, marketing, and in any fields of requiring strategic planning. SWOT is an analysis method used to evaluate the 'strengths', 'weaknesses', 'opportunities', 'threats' and PESTL is an analysis tool used for measuring the 'political', 'economical', 'social', 'technological' and 'low' risks involved in a various sphere of economy. In this study, firstly the essence of SWOT and PESTL analysis is explained, secondly the components of SWOT and PESTL analysis is examined. The paper includes risk analysis for further investigation to innovation sector of Uzbekistan economy.

Development of a Static and Dynamic Analysis System for Motor-Integrated High-Speed Spindle Systems Using Timoshenko Theory and Finite Element Method (Timoshenko 이론과 유한요소법을 이용한 모터내장형 고속주축계의 정특성/동특성 해석시스템 개발)

  • 이용희;김석일;김태형;이재윤
    • Journal of the Korean Society for Precision Engineering
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    • v.15 no.8
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    • pp.11-16
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    • 1998
  • Recently, the motor-integrated spindle systems have been used to simplify the machine tool structure, to improve the motion flexibility of machine tool, and to perform the high-speed machining. In this study, a static and dynamic analysis system for motor-integrated high-speed spindle systems is developed based on Timoshenko theory, finite element method and windows programming techniques. Since the system has various analysis modules related to static deformation analysis, modal analysis, frequency response analysis, unbalance response analysis and so on, it is useful in performing systematically the design and evaluation processes of motor-integrated high-speed spindle systems under windows GUI environment.

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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 Korean 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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Development of a Task Analysis Method and Classification of Emergency Tasks for Human Error Analysis in Nuclear Power Plants (원자력발전소 오류분석을 위한 직무분석 방법의 개발 및 직무유형 분류)

  • 정원대;박진균;김재환
    • Journal of the Korean Society of Safety
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    • v.16 no.4
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    • pp.168-174
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    • 2001
  • For human error analysis, the structure and situation of a task should be analyzed in advance. The paper introduces Structured Information Analysis (SIA) as a task analysis method for error analysis, and delineates the result of application on the emergency procedure of Korean Standard Nuclear Plants (KSNPs). From the task analysis about emergency procedure of KSNP, total 72 specific task goals were identified in the level of system function, and 86 generic tasks were classified from the viewpoint of physical sameness of the task description. Human errors are dependent on task types so that the result of task analysis would be used as a basis for the error analysis on the emergency tasks in nuclear power plants.

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Nonlinear finite element analysis of reinforced concrete structures subjected to transient thermal loads

  • Zhou, C.E.;Vecchio, F.J.
    • Computers and Concrete
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    • v.2 no.6
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    • pp.455-479
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    • 2005
  • This paper describes a 2D nonlinear finite element analysis (NLFEA) platform that combines heat flow analysis with realistic analysis of cracked reinforced concrete structures. The behavior models included in the structural analysis are mainly based on the Modified Compression Field Theory and the Distributed Stress Field Model. The heat flow analysis takes into account time-varying thermal loads and temperature-dependent material properties. The capability of 2D nonlinear transient thermal analysis is then implemented into a nonlinear finite element analysis program VecTor2(C) for 2D reinforced concrete membranes. Analyses of four numerical examples are performed using VecTor2, and results obtained indicate that the suggested nonlinear finite element analysis procedure is capable of modeling the complete response of a concrete structure to thermal and mechanical loads.

Verification of Stress Analysis on the Bracket of Bus Bear Chassis

  • Kim, Gyu Sung
    • International journal of advanced smart convergence
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    • v.11 no.4
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    • pp.266-272
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    • 2022
  • Structural stress analysis is performed to confirm the safety of the structures before the construction, and stress analysis is performed to evaluate the safety of various components before the ship or vehicle corresponding to the moving structure is manufactured. In this case, the stress analysis work is performed using the stress analysis software of each company. The results of the stress analysis based on the boundary conditions of the applied loads are analyzed to evaluate the safety of the structure, but the results are difficult to verify because most of the stress analysis software possessed by each company is one. In this paper, we were performed the stress analysis of the bracket applied to the bare chassis of the 30-passenger bus under development is performed by HYPERMESH. In order to verify this, the stress analysis is performed using ANSA/META under the same boundary condition. The stress analysis results of ANSA/META and HYPERMESH showed that they had the same stress distribution and the maximum stress occurred at the same location. Taken together, the results of stress analysis using HYPERMESH were reliable.

The Analysis of View and Daylights for the Design of Public Housing Complexes Using a Residential Environment Analysis System Integrated into a CAD System (주거환경분석시스템의 CAD 시스템 통합을 통한 공동주택단지설계 시 일조 및 조망분석에 관한 연구)

  • Park, Soo-Hoon;Ryu, Jeong-Won
    • Korean Journal of Computational Design and Engineering
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    • v.12 no.2
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    • pp.137-145
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    • 2007
  • This paper concerns about residential environment analysis program implementation for design and analysis on public housing complexes such that view and daylight analysis processes are automated and integrated into existing design routine to achieve better design efficiency. Considering the architectural design trends this paper chooses ArchiCAD as a platform for a CAD system, which contains the concepts such as integrated object-oriented CAD, virtual building and BIM. Residential environment analysis system consists of three components. The first component is the 3D modeling part defining 3D form information for external geographic contour models, site models and interior/exterior of apartment buildings. The second is the parametric library part handling the design parameters for view and daylight analysis. The last is the user interface for the input/output and integration of data for the environment analysis. Daylight analysis shows rendered images as well as results of daylight reports and grades per time and performs the calculations for floor shadow. It separates the site-only analysis from the analysis of site and exterior environmental parameters. View analysis considers horizontal and vertical view angles to produce view image from each unit and uses the bitmap analysis method to determine opening ratio, scenery ratio and void ratio. We could expect better performance and precision from this residential environment analysis system than the existing 2D drawing based view and daylight analysis methods and overcome the existing one-way flow of design information from 3D form to analysis reports so that site design modifications are automatically reflected on analysis results. Each part is developed in a module so that further integration and extension into other related estimation and construction management systems are made possible.

Spatial Analysis Methods for Asbestos Exposure Research (석면노출연구를 위한 공간분석기법)

  • Kim, Ju-Young;Kang, Dong-Mug
    • Journal of Environmental Health Sciences
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    • v.38 no.5
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    • pp.369-379
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    • 2012
  • Objectives: Spatial analysis is useful for understanding complicated causal relationships. This paper focuses trends and appling methods for spatial analysis associated with environmental asbestos exposure. Methods: Literature review and reflection of experience of authors were conducted to know academic background of spatial analysis, appling methods on epidemiology and asbestos exposure. Results: Spatial analysis based on spatial autocorrelation provides a variety of methods through which to conduct mapping, cluster analysis, diffusion, interpolation, and identification. Cause of disease occurrence can be investigated through spatial analysis. Appropriate methods can be applied according to contagiousness and continuity. Spatial analysis for asbestos exposure source is needed to study asbestos related diseases. Although a great amount of research has used spatial analysis to study exposure assessment and distribution of disease occurrence, these studies tend to focus on the construction of a thematic map without different forms of analysis. Recently, spatial analysis has been advanced by merging with web tools, mobile computing, statistical packages, social network analysis, and big data. Conclusions: Because the trend in spatial analysis has evolved from simple marking into a variety of forms of analyses, environmental researchers including asbestos exposure study are required to be aware of recent trends.