• IEIE Transactions on Smart Processing and Computing
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• 제5권1호
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• pp.22-28
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• 2016

Multi-loop control of a boost converter needs a current-sensing circuit to detect the inductor current. Current sensorless multi-loop control reduces the cost, size and weight of the converter. The Luenberger observer (LO) is widely used to estimate the inductor current for current sensorless control of a switching converter. However, the design of the LO-based sensorless multi-loop control has not been well presented, so far. In this paper, a closed-loop characteristics evaluation method is proposed to design an LO-based current sensorless multi-loop control for boost converters. Simulations show evaluations of the closed-loop characteristics. Practical experiments on a digital processor confirm the simulations.

• 한국컴퓨터정보학회:학술대회논문집
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• 한국컴퓨터정보학회 2014년도 제49차 동계학술대회논문집 22권1호
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• pp.299-302
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• 2014

현대사회에서 인간은 스마트폰에서 발생하는 디지털 효과음과 함께 살아간다. 그러나 이러한 디지털 소음때문에 자의와 상관없이 타인에게 피해를 주고 있다. 이러한 디지털 소음공해를 방지하기 위해 이미 몇몇 응용프로그램이 존재한다. 하지만 사용자의 욕구를 만족시켜주는 것은 없었다. 이러한 연유로, 사용자들의 요구사항을 충분히 반영하여 디지털 소음공해 방지를 위한 안드로이드 플랫폼 기반의 새로운 모바일 응용프로그램을 제시한다. 본 응용프로그램의 사용으로 인하여 타인의 생활에 방해를 주는 행동이 줄어들 것으로 예상된다.

• 산업공학
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• 제20권4호
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• pp.438-447
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• 2007

This paper presents an aspect-oriented approach to simulation design and analysis in system design phase for integrated logistics system simulation. The integrated logistics system composed of AS/RS (Automated Storages and Retrieval System), AGVs (Automated Guided Vehicle System), STVs (Sorting Transfer Vehicle System) and Conveyor System is designed by using the aspect-oriented approach and UML (Unified Modeling Language). The multi-factorial design of experiments and regression analysis are used for design parameters of the system and Evolution Strategies is used to verify each parameter. Aspect-oriented approach for the integrated logistics system simulation shows the advantages of code reusability, extendible, modulation, easy improvement and a better design technique.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2004년도 ICCAS
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• pp.1843-1846
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• 2004

This paper considers a robust observer-based $H_{\infty}$ controller design method for descriptor systems with parameter uncertainties using just one LMI condition. The sufficient condition for the existence of controller and the controller design method are presented by a perfect LMI condition in terms of all variables using singular value decomposition, Schur complement, and change of variables. Therefore, one of the main advantages is that a robust observer-based $H_{\infty}$ controller is found by solving one LMI condition compared with existing results. Numerical example is given to illustrate the effectiveness of the proposed controller design method.

• International Journal of Naval Architecture and Ocean Engineering
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• 제6권2호
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• pp.484-495
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• 2014

This paper introduces the use of network theory to model and analyze disparate ship design information. This work will focus on a ship's distributed systems and their intra- and intersystem structures and interactions. The three system to be analyzed are: a passageway system, an electrical system, and a fire fighting system. These systems will be analyzed individually using common network metrics to glean information regarding their structures and attributes. The systems will also be subjected to community detection algorithms both separately and as a multiplex network to compare their similarities, differences, and interactions. Network theory will be shown to be useful in the early design stage due to its simplicity and ability to model any shipboard system.

• 한국산업정보학회논문지
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• 제17권3호
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• pp.43-49
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• 2012

현재 운용되고 있는 리가시 시스템에 대한 요구명세서는 대부분 자료흐름도를 사용하고 있어, 시스템의 유지 보수를 위해서는 자료흐름도로부터 획득한 정보에 의존하지 않을 수 없다. 본 논문에서는 자료흐름도로부터 데이터베이스 테이블 설계순서를 추출하는 추출기를 설계, 구현하였다. 추출기는 자료흐름도를 입력 받아 저장하고, 이를 방향그래프로 변환하여 데이터베이스 테이블 설계순서를 추출하여 제시한다. 구현된 추출기는 실제 운용 중인 소프트웨어 시스템에 적용함으로써 실제 적용가능성을 보였다.

• 한국실내디자인학회논문집
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• 제14호
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• pp.137-149
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• 1998

Human history show the whole society changed rapidly and found that the momentum and foundation of such change is " the advanced technology ",which is, the advanced knowledge. The world is newly established based upon openess, spaclalization and globalization, and the each nation and company should have to adopt all the existing frames to follow the new world reality. Today is the changing period from industrial society to information society, and information technology plays a great role. As the information society moves ahead, world economy and social infrastructure will be based upon network society and various information systems will make an integrated information system. This paper presents that to establish interior design related information in the age of information with radical change of previous way of thinking, cooperative information exchange system. Also substantial and effective communication systems should be made and continuing cooperation system of interior design information area should be formulated.d be formulated.

• Asia pacific journal of information systems
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• 제2권1호
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• pp.17-33
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• 1992

This paper provides a framework for evaluating business information systems. The framework identifies three evaluation domains: IS business value, IS expenses, and IS functionality. Discussions of each category encompass what to be measured, how to measure, and how to judge the measured value. Then, the framework classifies three categories of individual information systems based on IS life cycle: industry-common, industry-similar, and firm-specific. This categorization is used to match the role of an individual system with the focus of evaluation efforts. The framework can contribute to the systematic design of evaluation programs for business information systems.

• 경영정보학연구
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• 제1권2호
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• pp.55-71
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• 1999

• 한국기계가공학회지
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• 제14권3호
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• pp.74-84
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• 2015

The core activities of a bicycle manufacturer are design, engineering analysis, and manufacturing. Therefore, it is important to develop a configuration design system for bicycles in order to automate the design process and facilitate the use of design data in engineering analysis and manufacturing. In this paper, we present a method to develop a bicycle configuration design system based on the part-shape information model. The proposed method enables the construction of a CAD library using modeling functions with equations and parameters that are common to most 3D mechanical CAD systems. Furthermore, the part-shape information model ensures the independence between the configuration design system and the library, making it possible to extend the CAD library flexibly without changing the system architecture.