• Title, Summary, Keyword: Tunning

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Stabilization Control of Inverted Pendulum by Self tuning Fuzzy Inference Technique (자기동조 피지추론 기법에 의한 도립진자의 안정화 제어)

  • Shim, Young-Jin;Kim, Tae-Woo;Lee, Oh-Keol;Park, Young-Sik;Lee, Joon-Tark
    • Proceedings of the KIEE Conference
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    • pp.83-85
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    • 1997
  • In this paper, a self-tunning fuzzy inference technique for stabilization of the inverted pendulum system is proposed. The facility of this self-tunning fuzzy controller which has swing-up control mode and a stabilization one, moves a pendulum in an initial natural stable equilibrium point and a cart in arbitrary position, to an unstable equilibrium point and a center of rail. Specially, the virtual equilibrium point(${\phi}_{VEq}$) which describes functionally considers the interactive dynamics between a position of cart and a angle of inverted pendulum is introduced. And comparing with the convention optimal controller, the proposed self-tunning fuzzy inference structure made substantially the inverted pendulum system robust and stable.

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Auto-Tunning of Activation Function in Neural Networks Using Fuzzy Inference (퍼지 추론에 의한 신경회로망 활성화 함수 형상의 자동 조정)

  • Gim, Ine;Jung, Kyung-Kwon;Kim, Joo-Woong;Seo, Won-Ho;Son, Dong-Seol;Eom, Ki-Hwan
    • Proceedings of the IEEK Conference
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    • pp.9-12
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    • 2000
  • In this paper, we propose the auto-tunning method for the gradient of activation function using fuzzy inference. In order to verify the usefulness of the proposed method, we simulated it with one link manipulator system and confirmed the excellency,

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Current-Fed Type Push-Pull High-Frequency Inverter (전류형 Push-Pull 고주파 인버어터)

  • Oh, Seung-Hoon;Lee, Bong-Seop;Lee, Sang-Ho;Lee, Dal-Hae;Lee, Sang-Kwon
    • Proceedings of the KIEE Conference
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    • pp.1123-1125
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    • 1992
  • In this paper, a current fed type Push-Pull high frequency inverter which have used in the past, proposed self tunning circuit. Also, theoretical analysis introduced which use normalization, and a several characteristics or circuit is estimated. Further, a purposed control circuit based on self tunning system is confirmed to be performance by experiment.

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Auto-tunning of a FLC using Neural Networks (신경망을 이용한 서보제어기의 자동조정)

  • Yeon, Jae-Kuen;Yum, Jin-Ho;Nam, Hyun-Do
    • Proceedings of the KIEE Conference
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    • pp.1034-1036
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    • 1996
  • In this paper, an adaptive fuzzy logic controller is presented for auto-tunning of the scaling factors by using learning capability of neural networks. The proposed scheme consists of the FLC which includes the PI-type FLC and PD-type FLC in parallel form and the neural network which learns scale factors of FLC. Computer simulations were performed to illustrate the effectiveness of a proposed scheme. A proposed FLC controller was applied to the second order system and velocity control of the brushless DC motors. For the design of the FLC, tracking error, change of error, and acceleration error are selected as input variables of the FLC and three seal e factors were used in the parallel-type FLC. This scheme can be used to reduce the difficulty in the selection of the scale factors.

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A Study on Self-tunning of PID Controller using Neural Network Theory (신경망이론을 이용한 PID제어기의 자기동조에 관한 연구)

  • Jun, Kee-Young;Hahm, Nyoun-Kun;Sung, Nark-Kuy;Lee, Seung-Hwan;Lee, Hoon-Goo;Han, Kyung-Hee
    • Proceedings of the KIEE Conference
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    • pp.2610-2612
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    • 1999
  • In controlling vector of induction motor, PID controller is required much time as the expert should control manually a gain of controller according to plant or a change of circumstances. Accordingly, this paper has gotten a gain of PID controller used neural network by self-funning method in order to settle above problem. The neural network can describe an input/output features in spite of non-linear system which is hard to get mathematical model by controlling the strength of connection by learning. It has a strong character against a distortion and noise of input information, and is suitable modeling of diver-variable system which is composed of several input/output. This paper has represented the self-tunning method for gain of PID controller used neural network when using PID controller to control speed of induction motor, and has checked strong characters against distortion and noise of input information through simulation.

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Blue organic light emitting diodes with carbazole based small molecules and color tunning by controlled side group

  • Kim, Y.B.;Ahn, Y.J.;Park, J.H.;Khang, M.W.;Woo, H.S.;Park, J.W.
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.514-516
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    • 2003
  • We have fabricated an air stable blue emitting organic electroluminescent devices (OLEDs) with a carbazole based emitting molecule, Bis(3-N-ethylcarbazolyl)terephthalidene (BECP). Our device emits strong blue at 472 nm with the luminance efficiency of near 1 lm/W at a voltage and current density of 8 V and 5.7 mA/cm2, respectively, reaching the brightness up to 5000 cd/m2 at 270 mA/cm2. Finally, in order to tune the emission color from blue to green, we have used Bis(3-N-ethylcarbazolyl)cynoterephthalidene (BECCP), a derivative of BECP by adding cyno group in side chain, and compared the electroluminscence (EL) of OLEDS prepared by BECCP to that of BECP based OLEDs.

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Design of a DC Motor Controller for FA (FA용 직류전동기 제어기 설계)

  • 오진석
    • Journal of the Korean Society of Safety
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    • v.9 no.4
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    • pp.49-57
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    • 1994
  • In this paper, a speed controller using a controller is implemented and applied to a DC motor for FA ( Factory Automation ). The objective of this paper treats the analytical and experimental studies on the improvement of control circuit and control method using a SCR-LEONARD circuit for the speed control of DC motor. This system is concerned with stabilization of single input or single output systems, so the plant (SCR-LEONARD+DC motor) is simplified to the first order system. The parameters for the PID controller are obtained by the transient-response tunning method, and this control scheme has a backward-shift operator. The control algorithms (Chopper+transient response tunning) is used to check the performance of PID Controller through Computer simulations and experiments. The good experiment results show that the direct control of the DC motor applied to industrial field such oi factory automation.

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A Study on the Masses Reduction for the Structural Safety Using Optimal Design Method (최적 설계법을 이용한 구조물 안전을 위한 질량 감소 연구)

  • 신귀수;이기형;정인성
    • Journal of the Korean Society of Safety
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    • v.13 no.1
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    • pp.40-46
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    • 1998
  • This paper is presented that theoretical optimization design method in order to consider mass reduction for the structural safety In this paper, it described methods for reducing vibration in structural safety by the determination of the optimum sizes and locations of tunning masses through formal mathematical optimization techniques. The optimization procedure which employs the tunning masses and corresponding locations is developed. Design variables are systematically changed to achieve low values of shear without a large mass penalty. Three optimization methods ire developed and tested. The first is based on minimizing the modal shaping parameter which indirectly reduce the modal shear amplitudes corresponding to each harmonic of airload. The second method reduces these amplitudes directly and the third method reduces the shear as a function of time during a revolution of the blade. The first method works well for reducing the shear for one mode responding to a single harmonic of the airload but has been found in some bases to be ineffective for more than one mode.

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Spatio- Temporal Join for Trajectory of Moving Objects in the Moving Object Database

  • Lee Jai-Ho;Nam Kwang-Woo;Kim Kwang-Soo
    • Proceedings of the KSRS Conference
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    • pp.287-290
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    • 2004
  • In the moving object database system, spatiotemporal join is very import operation when we process join moving objects. Processing time of spatio-temporal join operation increases by geometric progression with numbers of moving objects. Therefore efficient methods of spatio-temporal join is essential to moving object database system. In this paper, we propose spatio-temporal join algorithm with TB-Tree that preserves trajectories of moving objects, and show result of test. We first present basic algorithm, and propose cpu-time tunning algorithm and IO-time tunning algorithm. We show result of test with data set created by moving object generator tool.

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