• Title/Summary/Keyword: Control co-simulation

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Behavior of UHPC-RW-RC wall panel under various temperature and humidity conditions

  • Wu, Xiangguo;Yu, Shiyuan;Tao, Xiaokun;Chen, Baochun;Liu, Hui;Yang, Ming;Kang, Thomas H.K.
    • Advances in concrete construction
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    • v.9 no.5
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    • pp.459-467
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    • 2020
  • Mechanical and thermal properties of composite sandwich wall panels are affected by changes in their external environment. Humidity and temperature changes induce stress on wall panels and their core connectors. Under the action of ambient temperature, temperature on the outer layer of the wall panel changes greatly, while that on the inner layer only changes slightly. As a result, stress concentration exists at the intersection of the connector and the wall blade. In this paper, temperature field and stress field distribution of UHPC-RW-RC (Ultra-High Performance Concrete - Rock Wool - Reinforced Concrete) wall panel under high temperature-sprinkling and heating-freezing conditions were investigated by using the general finite element software ABAQUS. Additionally, design of the connection between the wall panel and the main structure is proposed. Findings may serve as a scientific reference for design of high performance composite sandwich wall panels.

Autonomous Mobile Robot System based on a Fuzzy Artificial Immune System (퍼지 인공 면역망 시스템을 이용한 자율이동로봇 시스템)

  • Lee, Dong-Je;Choi, Young-Kui
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2007.10a
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    • pp.257-260
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    • 2007
  • In this paper addresses the low-level behavior of fuzzy control and the high-level behavior selector for Autonomous Mobile Robots (AMRs) based on a Fuzzy Artificial Immune Network. The sensing information that comes from ultrasonic sensors is the antigen it, and stimulates antibodies. There are many possible combinations of actions between action-patterns and external situations. The question is how to handle the situations to decide the proper action. We propose a fuzzy artificial immune network to solve the above problem. and the computer simulation for an AMR action selector shows the usefulness of the proposed action selector.

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Analysis and Design of a Three-port Flyback Inverter using an Active Power Decoupling Method to Minimize Input Capacitance

  • Kim, Jun-Gu;Kim, Kyu-Dong;Noh, Yong-Su;Jung, Yong-Chae;Won, Chung-Yuen
    • Journal of Power Electronics
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    • v.13 no.4
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    • pp.558-568
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    • 2013
  • In this paper, a new decoupling technique for a flyback inverter using an active power decoupling circuit with auxiliary winding and a novel switching pattern is proposed. The conventional passive power decoupling method is applied to control Maximum Power Point Tracking (MPPT) efficiently by attenuating double frequency power pulsation on the photovoltaic (PV) side. In this case, decoupling capacitor for a flyback inverter is essentially required large electrolytic capacitor of milli-farads. However using the electrolytic capacitor have problems of bulky size and short life-span. Because this electrolytic capacitor is strongly concerned with the life-span of an AC module system, an active power decoupling circuit to minimize input capacitance is needed. In the proposed topology, auxiliary winding defined as a Ripple port will partially cover difference between a PV power and an AC Power. Since input capacitor and auxiliary capacitor is reduced by Ripple port, it can be replaced by a film capacitor. To perform the operation of charging/discharging decoupling capacitor $C_x$, a novel switching sequence is also proposed. The proposed topology is verified by design analysis, simulation and experimental results.

Fuzzy Logic Controller Design By Means Of Characteristic Design Parameters in a LASER Surface Hardening Process (단순화된 설계인자에 의한 레이저표면경화공정의 퍼지제어기 설계)

  • 박영준;김재훈;조형석
    • 제어로봇시스템학회:학술대회논문집
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    • 2000.10a
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    • pp.292-292
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    • 2000
  • Since high-power CO$_2$ Laser can be make a high densed energy to Local processing area, manufacturing processes using the laser can be processed for very Localized areas at a very fast rate with minimal or no distortion. Accordingly, the laser has been widely used in the fields of thermal manufacturing processes such as welding, fusion cutting, grooving, and heat treatment of metals. In particular, interest in the laser heat treatment process has grown tremendously in the past few years. In this process, maintaining the uniform hardening depth is important problem to obtain good quality products and to reduce heat induced distortion and residual stress. For achieving this objective, we introduced a new design technique of a fuzzy logic controller that greatly simplified the design procedure by defining several simplified design parameters. In the design procedure, the major design parameters of the controller are characterized by identifying several common aspects. From a series of simulation results, we found that the proposed design technique can be effectively used to design of a fuzzy logic controller for the LASER surface hardening process.

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A Study on Development and Real-Time Implementation of Voice Recognition Algorithm (화자독립방식에 의한 음성인식 알고리즘 개발 및 실시간 실현에 관한 연구)

  • Jung, Yang-geun;Jo, Sang Young;Yang, Jun Seok;Park, In-Man;Han, Sung Hyun
    • Journal of the Korean Society of Industry Convergence
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    • v.18 no.4
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    • pp.250-258
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    • 2015
  • In this research, we proposed a new approach to implement the real-time motion control of biped robot based on voice command for unmanned FA. Voice is one of convenient methods to communicate between human and robots. To command a lot of robot task by voice, voice of the same number have to be able to be recognition voice is, the higher the time of recognition is. In this paper, a practical voice recognition system which can recognition a lot of task commands is proposed. The proposed system consists of a general purpose microprocessor and a useful voice recognition processor which can recognize a limited number of voice patterns. Given biped robots, each robot task is, classified and organized such that the number of robot tasks under each directory is net more than the maximum recognition number of the voice recognition processor so that robot tasks under each directory can be distinguished by the voice recognition command. By simulation and experiment, it was illustrated the reliability of voice recognition rates for application of the manufacturing process.

Economical Design of Water Level Monitoring Network for Agricultural Water Quantification (농업용수 정량화를 위한 경제적 수위계측망 설계)

  • Kim, Sun Joo;Kwon, Hyung Joong;Kim, Il Jung;Kim, Phil Shik
    • Journal of The Korean Society of Agricultural Engineers
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    • v.58 no.5
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    • pp.19-28
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    • 2016
  • This study was to design the optimal locations of the water level monitoring to quantify the agricultural water use in irrigation area supplied from an agricultural reservoir. In most of agricultural areas without TM/TC (Tele-Monitoring and Tele-Control) or monitoring network, irrigation water have been supplied on conventional experience and agricultural reservoir have been operated based on the operating simulation results by HOMWRS (Hydrological Operation Model for Water Resources System). Therefore, this study quantified the amount of agricultural water use in an irrigation area (Musu Reservoir, Jincheon-gun) by establishing water level monitoring network and analyzed the agricultural water saving effect. According to the evaluation of the economic values for water saving effect, the saving agricultural water of 1.7 million ton was analyzed to have economic values of 0.85 million won as water for living, and 1.78 million won as water for industrial use. It is identified to secure economic feasibility of the new water monitoring network by establishing one monitoring point in the entrance, irrigation area and endpoint through the economic analysis.

A Study on the Fuzzy ELDC of Composite Power System Based on Probabilistic and Fuzzy Set Theories

  • Park, Jaeseok;Kim, Hongsik;Seungpil Moon;Junmin Cha;Park, Daeseok;Roy Billinton
    • KIEE International Transactions on Power Engineering
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    • v.2A no.3
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    • pp.95-101
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    • 2002
  • This paper illustrates a new fuzzy effective load model for probabilistic and fuzzy production cost simulation of the load point of the composite power system. A model for reliability evaluation of a transmission system using the fuzzy set theory is proposed for considering the flexibility or ambiguity of capacity limitation and overload of transmission lines, which are subjective matter characteristics. A conventional probabilistic approach was also used to model the uncertainties related to the objective matters for forced outage rates of generators and transmission lines in the new model. The methodology is formulated in order to consider the flexibility or ambiguity of load forecasting as well as capacity limitation and overload of transmission lines. It is expected that the Fuzzy CMELDC (CoMposite power system Effective Load Duration Curve) proposed in this study will provide some solutions to many problems based on nodal and decentralized operation and control of an electric power systems in a competitive environment in the future. The characteristics of this new model are illustrated by some case studies of a very simple test system.

Design Alterations of a Grinder of Semiconductor Wafer for the Improved Stability (반도체 Wafer용 Grinder의 안정화 설계)

  • Kil, Sa Geun;Ro, Seung Hoon;Shin, Yun Ho;Kim, Young Jo;Kim, Geon Hyeong
    • Journal of the Semiconductor & Display Technology
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    • v.16 no.1
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    • pp.91-96
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    • 2017
  • One of the most critical aspects of the modern semiconductor industry is the quality of wafer surface, the roughness of which is mostly caused by the ingot slicing. And the grinding is supposed to be the main process to reduce the surface roughness. The vibrations of the disc surface grinder are the major problem to effectively achieve the required surface quality. In this study, the structure of a disc surface grinder was analyzed through the experiment and the computer simulation to investigate the dynamic characteristics of the machine, and further to alter the design for the improved stability. The result of the study shows that simple design alterations without alternating main body can effectively suppress the vibrations of the machine.

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Application Case of Safety Stock Policy based on Demand Forecast Data Analysis (수요예측 데이터 분석에 기반한 안전재고 방법론의 현장 적용 및 효과)

  • Park, Hung-Su;Choi, Woo-Yong
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.43 no.3
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    • pp.61-67
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    • 2020
  • The fourth industrial revolution encourages manufacturing industry to pursue a new paradigm shift to meet customers' diverse demands by managing the production process efficiently. However, it is not easy to manage efficiently a variety of tasks of all the processes including materials management, production management, process control, sales management, and inventory management. Especially, to set up an efficient production schedule and maintain appropriate inventory is crucial for tailored response to customers' needs. This paper deals with the optimized inventory policy in a steel company that produces granule products under supply contracts of three targeted on-time delivery rates. For efficient inventory management, products are classified into three groups A, B and C, and three differentiated production cycles and safety factors are assumed for the targeted on-time delivery rates of the groups. To derive the optimized inventory policy, we experimented eight cases of combined safety stock and data analysis methods in terms of key performance metrics such as mean inventory level and sold-out rate. Through simulation experiments based on real data we find that the proposed optimized inventory policy reduces inventory level by about 9%, and increases surplus production capacity rate, which is usually used for the production of products in Group C, from 43.4% to 46.3%, compared with the existing inventory policy.

A Study on the Countermeasure Algorithm for Power System Disturbances in Large Scale Fuel Cell Generation System (대용량 연료전지시스템의 계통외란 방지알고리즘에 관한 연구)

  • Choi, Sung-sik;Kim, Byung-ki;Park, Jae-beom;Rho, Dae-seok
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.65 no.5
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    • pp.711-717
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    • 2016
  • Recently, fuel cell generation system with high energy efficiency and low CO2 emission is energetically interconnected with distribution power system. Especially, MCFC(molten carbonate fuel cell) operating at high temperature conditions is commercialized and installed as a form of large scale power generation system. However, it is reported that power system disturbances such as harmonic distortion, surge phenomenon, unbalance current, EMI(Electromagnetic Interference), EMC (Electromagnetic Compatibility) and so on, have caused several problems including malfunction of protection device and damage of control devices in the large scale FCGS(Fuel Cell Generation System). Under these circumstances, this paper proposes countermeasure algorithms to prevent power system disturbances based on the modelling of PSCAD/EMTDC and P-SIM software. From the simulation results, it is confirmed that proposed algorithms are useful method for the stable operation of a large scale FCGS.