• Title/Summary/Keyword: network base control

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Active vibration isolation of a hydraulic system using the hetero-synaptic neural network (헤테로-시넵틱 신경회로망을 이용한 유압시스템의 진동제어)

  • 정만실;조동우
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1995.04b
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    • pp.273-277
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    • 1995
  • Many hudraulic components have nonlinearities to some extent. These nonlinearities often cause the time delay, thus degrading the performance of the hydraulic control systems and making it difficult to modelthem. In this paper, a new vibration isolation control algorithm that eliminates the necessity of a sophiscated modeling of hydraulic system was proposed. The algotithm is a hybrid type control shecheme consisting of a linear controller and a hetero-synaptic neural network controller. Using this control scheme, simulations and experiments were performed for 1 DOF(Degree of freedom) and 2 DOF vibration isolation. The hybrid type control algorithm can isolate the base vibration signifcantly rather than linear control algorithm. And from the weights in hetero-synaptic neural network, we can get the 2nd equivalent differentialmodel of the hydraulic control system with on-line control operation. This equivalent model provides us with much information, such as stability and the characteristics of the control system.

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Authority control and authority files in the cooperative cataloging (분담목록에서의 전거통제와 전거일파공유)

  • 최달현
    • Journal of Korean Library and Information Science Society
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    • v.25
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    • pp.257-293
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    • 1996
  • This paper reviews various aspects of authouity control system and presents prerequistes for an effective authority control in our future cooperative cataloging. It can be summarized as follows. First, numerous factors affecting authority control must be analyzed and consistent procedures and policies on the authority control have to be established. Second, to make an effective bibiographic data base there must be a standard for the information processing and a systematic organization for information sharing and communicating. Third, for this objective we have to build a MARC format, establish a network for the exchange of automatic authority records among systems, standardize the transcription of multscripts, and establish a centralized automatic authority system for a consistent maintenance of authorityrecords of the union data base. Fourth, it would be one of the best way of achieving cooperative cataloging to set up such a nation-wide authority control system as the NACO in Japan.

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Development of control module for FMS construction (FMS 구축을 위한 제어 module 개발)

  • 최홍태;배용환;박재홍;이석희
    • 제어로봇시스템학회:학술대회논문집
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    • 1992.10a
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    • pp.1090-1095
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    • 1992
  • This paper describes the systematic control method of process information transfer and machine cell control in FMS implementation. We have constructed an experimental FMS computer network and control system. The system hardware consists of host computer to manage process data and information transfer of machine cells, cell control computers to control machine cells(NC lathe, machining center). On the other hand, software is made up of oredr management module, NC program searching and generation module, NC part program error check module and cell control module. In this study, we could arrive at conclusion as following : The first, each task could be accomplihed by the efficient information transfer in hierachical computer network. The second, data base system of part programs and process control data is needed for the efficint information transfer and production management. Lastly, expansion of FMS control system could be achieved by the hierachical and decentralized computer control system.

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Attitude Control of a Simulated Helicopter using a neural network (신경망을 이용한 모형 헬리콥터의 자세제어)

  • 김홍열;하홍곤
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.3 no.2
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    • pp.397-402
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    • 1999
  • In this paper, we derive dynamic equation of a simulated helicopter and propose the control method base on a neural network to control its attitude. The coupling coefficients are adjusted to minimize the error between the output of a control system and the reference value. The gain of the proposed controller are automatically adjusted by the back propagation of a neural network. Simulation results using MATLAB are given in this paper.

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Maximum Torque Control of SynRM Drive with Artificial Neural Network (인공 신경회로망에 의한 SynRM 드라이브의 최대토크 제어)

  • Ko, Jae-Sub;Nam, Su-Myeong;Chung, Dong-Hwa
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.54 no.4
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    • pp.185-191
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    • 2005
  • In this paper, a new approach for the Synchronous Reluctance Motor control which ensures producing Maximum Torque per Ampere(MTPA) over the entire field weakening region is presented. In addition, This paper presents a speed sensorless control scheme of SynRM using artificial neural network. Also, by adjusting the base speed for the field weakening operation according to the flux level, the current and voltage limit, the smooth and precise transition into the field weakening operation can be achieved. The proposed scheme is verified validity through simulation.

Precision Position Control of Piezoactuator Using Inverse Hysteresis Model and Neuro-PID Controller (역히스테리시스 모델과 PID-신경회로망 제어기를 이용한 압전구동기의 정밀 위치제어)

  • 김정용;이병룡;양순용;안경관
    • Journal of Institute of Control, Robotics and Systems
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    • v.9 no.1
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    • pp.22-29
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    • 2003
  • A piezoelectric actuator yields hysteresis effect due to its composed ferroelectric. Hysteresis nonlinearty is neglected when a piezoelectric actuator moves with short stroke. However when it moves with long stroke and high frequency, the hysteresis nonlinearty can not be neglected. The hysteresis nonlinearty of piezoelectric actuator degrades the control performance in precision position control. In this paper, in order to improve the control performance of piezoelectric actuator, an inverse modeling scheme is proposed to compensate the hysteresis nonlinearty. And feedforward - feedback controller is proposed to give a good tracking performance. The Feedforward controller is an inverse hysteresis model, base on neural network and the feedback control is implemented with PID control. To show the feasibility of the proposed controller and hysteresis modeling, some experiments have been carried out. It is concluded that the proposed control scheme gives good tracking performance.

(A Modelling of Policy Based Network Management Object with Active Properties) (능동 특성을 갖는 정책기반 망 관리 객체의 모델링)

  • 최은복
    • Journal of the Korea Computer Industry Society
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    • v.3 no.9
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    • pp.1189-1198
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    • 2002
  • Policy base management system that can satisfy various user's request in distributed system environment recently and manage network resources efficiently is required. Described policy base management information consisted of ECA(Event-Condition-Action) rules so that efficient management of various communication network and consistent management policy may be available in this paper. Policy is consisted of Event, Condition and Actions to achieve when condition is satisfied. And we can present formality of dynamic function of management object as applying policy to ATM congestion control model been applying in real environment.

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Analysis of Effects of Time-Delay in an Inverted Pendulum System Using the Controller Area Network

  • Cho, Sung-Min;Hong, Suk-Kyo
    • 제어로봇시스템학회:학술대회논문집
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    • 2004.08a
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    • pp.1474-1479
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    • 2004
  • In this paper, the design of the network system using the CAN and the analysis of effects of time delay in the system are presented. A conventional implementation technique induces many problems because of the amount and complexity of wiring and maintenance problems. The network system reduces these problems, but it cause another problem; time delay. Time delay in a sampling time does not have much effects on the system, but time delay over the sampling time changes the control frequency and ended up makes the system unstable. It is verified that time delay between each parts has different effects on the entire system. The results from this paper will be a base for studying algorithms to reduce effects of time delay in the system using the CAN.

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DBSCAN-based Energy-Efficient Algorithm for Base Station Mode Control (에너지 효율성 향상을 위한 DBSCAN 기반 기지국 모드 제어 알고리즘)

  • Lee, Howon;Lee, Wonseok
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.23 no.12
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    • pp.1644-1649
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    • 2019
  • With the rapid development of mobile communication systems, various mobile convergence services are appearing and data traffic is exploding accordingly. Because the number of base stations to support these surging devices is also increasing, from a network provider's point of view, reducing energy consumption through these mobile communication networks is one of the most important issues. Therefore, in this paper, we apply the DBSCAN (density-based spatial clustering of applications with noise) algorithm, one of the representative user-density based clustering algorithms, in order to extract the dense area with user density and apply the thinning process to each extracted sub-network to efficiently control the mode of the base stations. Extensive simulations show that the proposed algorithm has better performance results than the conventional algorithms with respect to area throughput and energy efficiency.

A Study on Connection Control using GRE Tunneling Technique in High-speed IP Infrastructure (초고속 IP 기반에서 GRE 터널링 기법을 이용한 접속 제어 연구)

  • Lee Jae-Wan;Kim Hyoung-Jin;Ko Nam-Young
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.10 no.6
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    • pp.1038-1044
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    • 2006
  • Tunneling technique does a role to network authentication or the preservation support of date at high-speed network In order to this, IPsec, SOCKS V5 or GRE tunneling protocol have been using. This paper embodies the offer base of communication service by changing routing route to special IP band for connection interception of harmful service md according to user's needs, by changing routing route to special service at high-speed network. So we measure and analysis action principle of GRE with GRE protocol, the result apply to a service of connection control and authentication base.