• 산업공학
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• 제18권4호
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• pp.431-443
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• 2005

This paper describes a web-based system called DESIGNER for the analysis and design for automated material handling equipment(MHE) applications in manufacturing. DESIGNER models the processes for system integration, economic analysis, performance analysis, and automated storage/retrieval system(AS/RS) design. Based on the information specified by users, the various analysis modules are invoked to meet the needs of the material handling applications. The results of the analyses provide system users with useful data for material handling system design and decision on investment in automated MHE. Example problems are also presented to demonstrate the use of the system.

• 대한조선학회논문집
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• 제44권4호
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• pp.451-458
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• 2007

A preliminary design approach for superyachts is introduced. The state-of-the-arts of superyachts is investigated and their characteristics are indirectly examined by analyzing the data collected from built vessels. The analysis of data provides a guideline for the establishment of an preliminary hull form of a superyacht. The rules and regulations governing the design and construction of superyachts are collected and considered. A modeling approach for prompt and efficient design is also introduced. A sample hull form of a selected superyacht is constructed using commercial design packages not only to produce a hull form but to analyze the hydrostatic and hydrodynamic performances of the constructed vessel. Various visualization techniques are considered as an efficient tool for design verification.

• Composites Research
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• 제36권3호
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• pp.230-240
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• 2023

전개형 반사판 안테나는 단위 구조물 형태의 반사판이 접힌 상태로 수납되어 발사체에 탑재된 후, 운용궤도에 도달 및 전개되어 임무를 수행하는 위성체이다. 전개형 반사판 안테나는 수납 부피를 줄일 수 있어 발사체의 제한적 수납공간에 대형 우주 구조물을 탑재시킬 수 있으며, 경량소재를 적용할 경우 발사 및 운용 성능 향상에 용이한 장점이 있다. 본 논문에서는 전개형 반사판 안테나를 구성하는 주반사판에 대해 강성 및 강도 등의 구조적 분석을 통해 초기 개념설계를 수행하였다. 탄소섬유 복합재 및 허니콤 코어를 적용하여 경량 복합재 주반사판을 설계하였으며, 적층 패턴 및 형상을 설계 변수로 운용조건에 적합한 주반사판 설계안을 도출하였다. 이후 모드(Modal analysis), 준정적(Quasi-static), 열 구배(Thermal gradient) 및 동적(Dynamic) 거동에 대한 상세 구조해석을 수행하여 경량 복합재 반사판 안테나의 성능을 분석하였다

• 한국정밀공학회지
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• 제28권11호
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• pp.1297-1308
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• 2011

The light-weight design of UTM (Urban Transit Maglev)-02 car-body frames are performed, based on initial configuration. The thicknesses of fourteen sub-structures are defined as design variables and the loading condition is considered according to weight of sub-structures, electronic and pneumatic modules and passengers. For efficient and robust process of design optimization, objective function and constraints are approximated by response surface approximation. Structural analysis is performed at some sampling points to construct the approximated objective function and constraints composed of design variables. Design space is changed to find many optimal candidates and best optimal design can be found eventually. The Matlab Optimization Toolbox is used to find optimal value and sensitivity analysis about each design variable is also performed.

• 한국산학기술학회논문지
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• 제17권8호
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• pp.363-368
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• 2016

고장으로 인한 사고 등으로 막대한 피해를 초래할 수 있어 안전성이 중요시 되는 시스템을 안전중시 시스템이라고 한다. 시스템의 대형화, 복잡도 증가 및 무인화 운영 등으로 인해서 안전 위해 요소가 증가하고 있기 때문에 안전성 확보는 국방 및 다양한 산업분야에서 중요한 문제가 되었다. 이러한 이유로 미 국방부와 IEC 등 국제표준기구 등에서는 안전 관련 표준을 만들어서 안전성 확보의 강조 및 시스템 설계와 안전성 분석의 연계를 제시하고 있다. 또한 많은 연구들에서 안전성 분석 활동이 반영된 시스템 설계 프로세스, 방법론 및 도구가 개발되고 있다. 하지만 현재까지 제시된 시스템 설계와 안전성 분석의 통합 프로세스는 각 계층 수준에 존재하는 시스템 설계 정보를 어떻게 활용하는지 명확하게 제시하지 하지 못했다. 그 결과, 체계적인 방식으로 위험원을 식별하는데 어려움이 따르게 되었다. 이와 같은 문제점을 해결하기 위해서 본 연구에서는 각 계층 수준의 시스템 설계 정보를 기반으로 위험원을 식별하여 안전성을 향상 시키고, 여러 산업 분야에 적용 가능한 시스템 설계와 안전성 분석 활동의 통합 모델을 생성했다. 통합 모델이 체계적으로 안전성 분석을 수행할 수 있는 것을 보여주기 위해서 자동차 시스템을 대상으로 적용한 연구결과를 제시하였다.

• 한국산업정보학회논문지
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• 제14권5호
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• pp.83-89
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• 2009

Management of risks is critical issue in the project management and it is important to ensure that risk management is done in a sensible way. Risk analysis is an activity geared towards risk mitigation in risk management technique. Many techniques to manage, analyze and reduce risks have been done previously but only few have addressed the design analysis to reduce risk and none have attempted to analyze architecture to manage risks. In this paper we try to find a solution through various analyzing various software architectural design concepts. We follow Pressman's method of analyzing architecture design, and then alter it to identify risks which are used in risk analysis process further in risk management process. The risks assessed are analyzed later in the risk management cycle.

• International Journal of Control, Automation, and Systems
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• 제5권5호
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• pp.547-558
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• 2007

This paper proposes a simpler solution to the stabilization problem of a special class of nonlinear underactuated mechanical systems which includes widely studied benchmark systems like Inertia Wheel Pendulum, TORA and Acrobot. Complex internal dynamics and lack of exact feedback linearizibility of these systems makes design of control law a challenging task. Stabilization of these systems has been achieved using Energy Shaping and damping injection and Backstepping technique. Former results in hybrid or switching architectures that make stability analysis complicated whereas use of backstepping some times requires closed form explicit solutions of highly nonlinear equations resulting from partial feedback linearization. It also exhibits the phenomenon of explosions of terms resulting in a highly complicated control law. Exploiting recently introduced Dynamic Surface Control technique and using control Lyapunov function method, a novel nonlinear controller design is presented as a solution to these problems. The stability of the closed loop system is analyzed by exploiting its two-time scale nature and applying concepts from Singular Perturbation Theory. The design procedure is shown to be simpler and more intuitive than existing designs. Design has been applied to important benchmark systems belonging to the class demonstrating controller design simplicity. Advantages over conventional Energy Shaping and Backstepping controllers are analyzed theoretically and performance is verified using numerical simulations.

• 시스템엔지니어링학술지
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• 제1권1호
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• pp.14-19
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• 2005

High temperature vacuum furnaces or high standard electric furnaces demand high technology level and high production cost. Therefore, an iterative design process and the optimization approach under integrated computing environment are required to reduce the development risk. Moreover, it also required to develop an integrated design software that can manage the centralized database system between factory and design department, and the automated furnace design and analysis. The developed software is dedicated to the development of the vacuum (electric) furnaces. Based on the distribute middleware system, the GUI module, the CAD module, the thermal analysis module and the optimization module are integrated. For the DBMS, Microsoft Access is employed, the GUI is developed using Visual Basic language, and AutoCAD is utilized for the configuration design. By investigating the analysis code interface, the analysis and optimization process, and the data communication method, the overall system architecture, the method to integrate the optimizer and ana lysis codes, and the method to manage the data flow are proposed and verified through the optimal furnace design.

• 한국지능시스템학회:학술대회논문집
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• 한국퍼지및지능시스템학회 1993년도 Fifth International Fuzzy Systems Association World Congress 93
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• pp.985-988
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• 1993

An alternative approach to the design of application-driven fuzzy systems is proposed. A broad class of fuzzy systems applications requires a certain fuzzy partition of the input space while it demands for simple numerical quantities. For this class, a dedicated fuzzy system archictecture is presented and a design strategy is proposed. Both the single-input/single-output and multi-input/multi-output cases are considered. Numerical analysis are complete illustrating several aspects of the proposed framework.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2000년도 제15차 학술회의논문집
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• pp.435-435
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• 2000

Light Rail Transit (LRT) system is a complex and large system in which there are many subsystems, interfaces, functions and demanding performance requirements. Because many contractors participate in the development, it is necessary to apply methods of sharing common objectives and communicating effectively among all of the stakeholders. This paper shows not only the methodology and the results of computer-aided systems engineering including requirement management, functional analysis and architecting LRT system, but also propose a tool to help manage a project by linking WBS (Work Breakdown Structure), work organization and PBS (Product Breakdown Structure). The application of computer-aided tool RDD-100 provides the capability to model product design knowledge and decisions about important issues such as architecting the top-level system. The product design knowledge will be essential in integrating the following life-cycle phase activities over the life of the LRT system. Additionally, when a new generation train system is required, the reuse of the database can increase the system design productivity and effectiveness significantly.