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Synthesis and charaterization of binder for binder jetting additive manufacturing
백재호,편성은,이만식 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
“Additive Manufacturing”(AM), widely known as three dimensional printing(3D printing), is defined as the process of joining materials to make objects from 3D model data, usually layer by layer, as opposed to subtractive manufacturing methodologies. To date, various AM processes have been developed, including Fused Deposition Modeling (FDM), Selective Laser Sintering(SLS), Laminated Object Manufacturing(LOM), and Binder Jetting(BJ). Of them, Binder jetting(BJ) is one of 3D printing technologies to manufacture complex objects, in which a liquid binding agent is ejected to desired position of a substrate (e.g., sand). For this process, properties of a binder used in BJ, and jetting condition have largely various effects on formability of the objects. In this study, binders for 3D printing were synthesized and the resulting jetting characteristics were identified. In addition, the characteristics of making molds suitable for casting were identified using them.
불확실한 $L\ddot{u}$ 카오스 시스템을 위한 적응 퍼지 Bilinear 동기화 제어 설계
백재호,이희진,박민용,Baek, Jae-Ho,Lee, Hee-Jin,Park, Mig-Non 대한전자공학회 2010 電子工學會論文誌-CI (Computer and Information) Vol.47 No.3
본 논문은 불확실한 $L\ddot{u}$ 카오스 시스템의 동기화를 위한 적응 퍼지 bilinear 동기화 제어 설계 방법을 제안한다. $L\ddot{u}$ 카오스 시스템은 알려지지 않은 파라미터를 가지고 있다고 가정한다. 먼저, 불확실한 $L\ddot{u}$ 카오스 시스템을 TS 퍼지 bilinear 모델링을 통해 재구성한다. 불확실한 파라미터를 가진 TS 퍼지 bilinear $L\ddot{u}$ 카오스 시스템을 기반으로한 적응 퍼지 bilinear 동기화 제어 기법을 설계한다. Lyapunov 이론을 통해서 설계된 적응 퍼지 bilinear 동기화 제어 기법을 통한 TS 퍼지 bilinear $L\ddot{u}$ 카오스 시스템과 제안된 슬레이브 시스템 간의 오차 다이나믹 시스템의 안정성을 보장하고 이를 통해서 불확실한 파라미터를 추정 할 수 있는 적응 규칙을 유도한다. 제안된 동기화 제어 기법을 시뮬레이션을 통해서 그 명확성을 보이고자 한다. This paper is proposed an adaptive fuzzy bilinear synchronization design for uncertain $L\ddot{u}$ chaos system. It is assumed that the $L\ddot{u}$ chaos system has unknown parameters. First, The $L\ddot{u}$ chaos system can be reconstructed via TS fuzzy bilinear modeling. We design an adaptive fuzzy bilinear synchronization control scheme based on TS fuzzy bilinear $L\ddot{u}$ chaos system with uncertain parameters. Lyapunov theory is employed to guarantee the stability of error dynamic system between TS fuzzy bilinear $L\ddot{u}$ chaos system and the proposed slave system and to derive the adaptive laws for estimating unknown parameters. Simulation results is given to demonstrate the validity of our proposed synchronization scheme.
정밀산업(TFT-LCD) 공장 내 노광장치의 대형 세대별 동강성 허용규제치 예측 및 평가에 관한 연구
백재호,전종균,박상곤 한국반도체디스플레이기술학회 2011 반도체디스플레이기술학회지 Vol.10 No.4
The lithography system installed inside precision industry’s (e.g. TFT-LCD) production factories are increasing in size, thereby increasing its dynamic load along with it. Such condition causes vibration within the area where the system is installed, which then negatively affects the production line to produce defective products. To prevent this type of situation, the facilities should adopt dynamic design that considers the lithography system’s dynamic load. This study predicts the maximum value allowed for dynamic stiffness (which is a ratio of vibration response against a single unit of the dynamic load) of the lithography system and explains the result of its application on actual structures inside the facilities.
불확실한 Lu 카오스 시스템을 위한적응 퍼지 Bilinear 동기화 제어 설계
백재호,이희진,박민용 대한전자공학회 2010 電子工學會論文誌-CI (Computer and Information) Vol.47 No.3
This paper is proposed an adaptive fuzzy bilinear synchronization design for uncertain Lu chaos system. It is assumed that the Lu chaos system has unknown parameters. First, The Lu chaos system can be reconstructed via TS fuzzy bilinear modeling. We design an adaptive fuzzy bilinear synchronization control scheme based on TS fuzzy bilinear Luchaos system with uncertain parameters. Lyapunov theory is employed to guarantee the stability of error dynamic system between TS fuzzy bilinear Lu chaos system and the proposed slave system and to derive the adaptive laws for estimating unknown parameters. Simulation results is given to demonstrate the validity of our proposed synchronization scheme. 본 논문은 불확실한 Lu 카오스 시스템의 동기화를 위한 적응 퍼지 bilinear 동기화 제어 설계 방법을 제안한다. Lu 카오스시스템은 알려지지 않은 파라미터를 가지고 있다고 가정한다. 먼저, 불확실한 Lu 카오스 시스템을 TS 퍼지 bilinear 모델링을통해 재구성한다. 불확실한 파라미터를 가진 TS 퍼지 bilinear Lu 카오스 시스템을 기반으로한 적응 퍼지 bilinear 동기화 제어 기법을 설계한다. Lyapunov 이론을 통해서 설계된 적응 퍼지 bilinear 동기화 제어 기법을 통한 TS 퍼지 bilinear Lu 카오스 시스템과 제안된 슬레이브 시스템 간의 오차 다이나믹 시스템의 안정성을 보장하고 이를 통해서 불확실한 파라미터를 추정할 수 있는 적응 규칙을 유도한다. 제안된 동기화 제어 기법을 시뮬레이션을 통해서 그 명확성을 보이고자 한다.
백재호,황은주,김은태,박민용 한국지능시스템학회 2009 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.9 No.2
A Heating, Ventilating and Air Conditioning (HVAC) system is a nonlinear multi-input multi-output (MIMO) system. This system is very difficult to control the temperature and the humidity ratio of a thermal space because of complex nonlinear characteristics. This paper proposes an adaptive fuzzy output feedback control based on observer for the nonlinear HVAC system. The nonlinear HVAC system is linearized through dynamic extension. State observers are designed for estimating state variables of the HVAC system. Fuzzy systems are employed to approximate uncertain nonlinear functions of the HVAC system with unavailable state variables. The obtained controller compares with an adaptive feedback controller. Simulation is given to demonstrate the effectiveness of our proposed adaptive fuzzy method.
IT 컨설팅의 변천 및 발전과정에 대한 연구-산업별, 솔루션별, 프로젝트 유형별 IT 컨설팅 프로젝트를 바탕으로-
백재호,서현석,홍성완,조동길,성민정 한국경영과학회 2002 한국경영과학회 학술대회논문집 Vol.2002-A No.-
The purpose of the study is to differentiate and analyze the IT consulting projects conducted and accumulated by the 'A' consulting company into the categories of the industry, the solution and the project type to analyze their trend to forecast of the future. The significance of the study is the successful integration of ten years of project experiences to present the model of "Four level of IT-enabled consulting business" based on the prior study by Venkatraman (1991). The analysis show that the business environment has been changing continuously from the period of the productivity enhancement through process reengineering, to the operational efficiency and integration, through the partnership management, and lastly to the integration of different solutions to extend existing business boundaries As a whole, the development of IT consulting process can be concluded as an effort to acquire the competitive advantage among business to business from the macroeconomic standpoint. The recent trend indicate the number of companies putting more of their attention and resource into IT investment, which the magnitude of IT consulting rises more than ever before.