• Title/Summary/Keyword: Control Transition

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Translating concurrent programs into petri nets for synthesis of asynchronous circuits (비동기회로 합성을 위한 병행 프로그램의 페트리 넷으로의 변환)

  • 유동훈;이동익
    • Proceedings of the IEEK Conference
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    • 1998.06a
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    • pp.883-886
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    • 1998
  • We introduce a high level synthesis methodlogoy for automatic synthesis of asynchronous circuits form a language based on CSP. The input language is a high level concurrent algorithmic specification that can model complex concurrent control flow, logical and arithmetic computation and communications between them. This specification is translated into petri net which has actions. These actions are refined to synthesize the controllers and to allocate the data resources. We use the automatic synthesis through signal transition graphs (STGs) that allows to take advantage of logic synthsis methods to optimize the circuit.

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Liquid crystal ferroelectric colloids; non-synthetic method of adjusting properties

  • Reznikov, Yuriy;Buchnev, Olexander;Li, Fenghua;West, John
    • 한국정보디스플레이학회:학술대회논문집
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    • 2006.08a
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    • pp.163-166
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    • 2006
  • We found dramatic changes of the properties of LCs by dispersing ferroelectric nanoparticles. Specifically, ferroparticles greatly increase the nematic-isotropic transition temperature, birefringence and dielectric anisotropy of the LC. Ferroelectric nanoparticles/LCs colloids offer a simple and effective means to precisely control the physical properties of LC materials and optimize them for display applications.

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Photoalignment Process of Optical Anisotropic Pentacene Thin Film for Organic TFTs

  • Yu, Chang-Jae;Kim, Sung-Jin;Kim, Chi-Hwan;Lee, Sin-Doo
    • 한국정보디스플레이학회:학술대회논문집
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    • 2005.07b
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    • pp.1351-1354
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    • 2005
  • We report on the photoalignment process of pentacene thin film with optical anisotropy on treated buffer layers. The photopolymer, showing an anchoring transition, was used as a buffer layer to control the structural order of the pentacene molecules. Using the photoelastic modulator, it was found that the grain size and the optical anisotropy of the pentacene thin film were strongly correlated with each other.

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Suggestion for method to improve power consumption of the ZigBee RF4CE platform

  • Woo, Eun-Ju;Moon, Yu-Sung;Kim, Jung-Won
    • Journal of IKEEE
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    • v.22 no.2
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    • pp.476-479
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    • 2018
  • This paper proposes a method for reducing the amount of current consumption by the transceiver based remote control and the ZigBee RF4CE network layer step. We have studied how to improve power efficiency at short transition time through duty rate management. Also, comparing the measured current consumption before and after the improvement, we confirmed the correlation between the data transmission speed improvement and the current reduction.

A method for deciding weighting matrices by considering a steady-state deviation in a LQ tracking problem (정상상태 추적편차를 고려한 가중행렬의 선택)

  • 이진익;전기준
    • 제어로봇시스템학회:학술대회논문집
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    • 1989.10a
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    • pp.473-476
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    • 1989
  • Quadratic weighting matrices have an effect on the transition and steady state responses in a LQ tracking problem. They are usually decided on trial and error in order to get a good response. In this paper a method is presented which calculates a steady - state deviation without solving Riccati equation. By using this method, a new procedure for selecting the weighting matrices is proposed when a tolerance on the steady - state deviation is given.

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A framework for modelling and operation management of robotic assembly cells via knowledge base (지식베이스를 이용한 로보틱 조립셀의 모델링과 운영관리를 위한 프레임 워크)

  • 김대원;고명삼;이범희
    • 제어로봇시스템학회:학술대회논문집
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    • 1988.10a
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    • pp.374-379
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    • 1988
  • We propose a framework for modelling and operation management of robotic assembly cells via knowledge base. In the framework, each component of the cell is considered as a state variable, the relations among the state variables are stored in state transition maps(STMs) and then transformed into the form of knowledge. The assembly job tree(AJT) which includes the precedence relations and the constraints for assembly tasks is also described. Finally, an algorithm is presented to manage the cell operation.

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Emerging Issues of Urban Management and Planning for Seoul

  • Kwon, Won-Yong
    • Journal of the Korean Regional Science Association
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    • v.12 no.2
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    • pp.69-78
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    • 1996
  • This paper intends to raise some of urban policy issues of managing and planning Seoul for the twenty first century. As one of the world's most dynamic megacities, Seoul is faced with at least two trends: one is globalization of the economy, and the other is humanization of urban development in relation to people's quality of life. Given this context, there are emerging issues in a time of transition as the following; pedestrianization, decline of city master plan, micro land use control, citizen involvement, metro-wide management, infrastructure provisions and maintenance, sustainable development, urban information sustaniable development, urban information system, and public-private partnership.

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Vibration control characteristics of epoxy laminate beam utilizing shape memory polyurethane (형상기억 폴리우레탄을 이용한 epoxy laminate beam의 진동제어 특성에 관한 연구)

  • 양재흥;신규철;정용찬;조재환;전병철
    • Proceedings of the Korean Fiber Society Conference
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    • 2001.10a
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    • pp.326-326
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    • 2001
  • Epoxy/glass fiber 복합재는 높은 strength와 stiffness를 갖는 장점이 있지만 impact strained energy를 효율적으로 발산시킬 수 있는 mechanism을 가지고 있지 않기 때문에 damping 능력이 떨어진다 Impact strength와 damping 성능을 증가시키기 위해 사용되어지고 있는 방법은 형상기억 고분자를 이용한 것으로 상대적으로 높은 strength와 impact에 대한 흡수 및 발산을 가지고 있다 형상기억 고분자는 glass transition temperature(G$_{g}$) 근처에서 높은 damping 능력을 가지고 있다. (중략)

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Implementation of a ZVT-PRT Current Controlled Inverters using a Digital Signal Processor (DSP를 이용한 ZVT-PRT 전류제어형 인버터의 구현)

  • 이성룡;전칠환;김상수
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2002.11a
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    • pp.425-429
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    • 2002
  • In this paper, a single-phase inverter using a diode bridge-type resonant circuit to implement ZVT(Zero Voltage Transition) switching is presented. The current control algorithm is analyzed about how to design the circuit with auxiliary switch which can ZVT operation for the main power switch. The simulation and experimental results would be shown to verify the proposed current algorithm, because the main power switch is turn on with ZVT and the hi-directional inverter is operated.

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