• Title/Summary/Keyword: step speed

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A Study on Adaptive Feature-Factors Based Fingerprint Recognition (적응적 특징요소 기반의 지문인식에 관한 연구)

  • 노정석;정용훈;이상범
    • Proceedings of the IEEK Conference
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    • 2003.07e
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    • pp.1799-1802
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    • 2003
  • This paper has been studied a Adaptive feature-factors based fingerprints recognition in many biometrics. we study preprocessing and matching method of fingerprints image in various circumstances by using optical fingerprint input device. The Fingerprint Recognition Technology had many development until now. But, There is yet many point which the accuracy improves with operation speed in the side. First of all we study fingerprint classification to reduce existing preprocessing step and then extract a Feature-factors with direction information in fingerprint image. Also in the paper, we consider minimization of noise for effective fingerprint recognition system.

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Effect of Processing Conditions of ITY on the Physical Properties of Compound Yarn for New Synthetic Fabrics( II ) (ITY 제조공정조건이 신합섬용 복합사의 물성에 미치는 영향(II))

  • 한원희;이승환;이상정;노태철;김승진
    • Textile Coloration and Finishing
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    • v.13 no.2
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    • pp.135-140
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    • 2001
  • Interlace texturing is very useful method to make compound yarns for new synthetic fabrics. In this study, we make the compound ems for peach skin fabric by interlace texturing method. This study surveys relationship between physical properties of interlace textured yarns and process conditions such as air pressure, yarn tension and take-up speed. Nip density, tensile properties and multi-step shrinkage of the various specimens were discussed with process conditions.

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Damping improvement of VR-type motor by exciter control by exciter control (여자제어에 의한 VR 형 스텝모터의 제동특성개선)

  • Kang, Sang-Soo;Hahn, Song-Yop
    • Proceedings of the KIEE Conference
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    • 1987.11a
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    • pp.45-48
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    • 1987
  • In applications of step-motor, the requirements of small-size and strong-power gave birth to feed-back drive to the maximum efficiency and complete damping. In this paper, a new scheme that determines switching times from sensed values of position and speed is presented for simple bang-bang type drive circuit. The optimal values of each phase switching times are obtained using conjugate gradient method.

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Energy Storage And Power Compensation Based on Flywheel WRIM System (플라이휠 유도전동기 시스템을 이용한 에너지 저장 및 전력보상)

  • 김윤호;이경훈;박경수
    • Journal of the Korean Society for Railway
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    • v.2 no.4
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    • pp.32-39
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    • 1999
  • A flywheel system which can compensate electric power is presented. The designed system has a capability of providing real and imaginary power instantaneously as well as storing energy. In this paper, a control algorithm is designed. The designed algorithm is to control the secondary side current of the wound rotor induction motor using voltage-based PWM inverter. The flywheel system has advantages in converter size and power quality improvement comparing to the conventional system.

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Hardware Design of Standard Hash Algorithm HAS-160

  • Youn Choong-Mo;Lee Beom-Geun
    • Journal of information and communication convergence engineering
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    • v.3 no.4
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    • pp.205-208
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    • 2005
  • This paper is about the hardware implementation of the Hash algorithm, HAS-160, which is widely used for Internet security and authentication. VHDL modeling was used for its realization and the operation speed has been increased by the optimized scheduling of the operations required for step operations.

A Stabilisation Scheme of a Stepping Motor for a Fiber Optic Gyrocompass System (광파이버 자이로콤파스 시스템을 위한 스텝핑모터의 안정화)

  • Kwon, Yong-Soo;Jung, Sam
    • Proceedings of the KIEE Conference
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    • 1997.07a
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    • pp.152-154
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    • 1997
  • This paper describes a study of a stabilisation scheme of a stepping motor in the driving systems of the Fiber Optic Gyrocompass absolutely required a constant speed and a precise position control with fine step angle. The new stabilisation scheme combining microstepping control and frequency modulation is developed which enables the experimental machine to be capable of stable running to a stepping frequency in the range 5 times the open-loop stall frequency.

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Color proposal research for High Speed Train' Vehicle Design (고속열차 외장디자인을 위한 색채제안)

  • Lee So-Jung
    • Proceedings of the KSR Conference
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    • 2004.10a
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    • pp.1751-1756
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    • 2004
  • It will say as sense of this research that aid in new design system on our country South Korea type rapid that is developed continuously forward while increase step that do creation with rapid and environment that can not fall in the name of contemporary writings presenting universal color image self-acknowledgement being most nationality that is color image word that is intention enemy the future that image of rapid through such series process thinks.

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A New Anti-windup Strategy for PI Speed Controllers (PI 속도제어기의 새로운 Anti-windup 기법)

  • Yun, Won-Eel;Cho, Jong-Woo;Kim, Heung-Geun
    • Proceedings of the KIEE Conference
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    • 2005.04a
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    • pp.140-142
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    • 2005
  • 본 논문은 산업용 전동기 시스템의 속도제어기에서 계단(Step)입력에 대한 속도의 오버슈트를 억제하는 새로운 방식의 반와인드업(Anti-windup)기법을 소개한다. 비례(P)제어기에서 비례적분(PI)제어기로의 전환 시점에 적분기가 적절한 초기값을 가지게 하여 오버슈트를 상쇄 시키고 빠른 응답 시간을 가지게 하였다. 시뮬레이션을 통하여 제안된 방법의 타당성을 확인하고 기존의 반와인드업 기법과 비교하여 그 우수성을 검증하였다.

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A study on the microstep control of stepping motors (스텝모우터의 미세스텝 제어에 관한 연구)

  • 김도현;최계근;이종각
    • 전기의세계
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    • v.31 no.1
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    • pp.68-73
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    • 1982
  • An accurate mathematical model of permanent magnet stepping motor is proposed. On the basis of this model, micro-stepping control is experimented. A comparison is made between the Data experimented by micro-stepping control and the data predicted by the proposed model and by Leenhouts' earlier model. The result shows that the proposed model is more accurate than the earlier model, and micro-stepping can be attained by dividing a given step electrically, without adding much complexity to the control circuit, or degrading the speed of stepping motors.

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THREE-STEP SPEED CONTROL IN THE INDUCTION MOTOR BY PHASE CONVERSION (상변환에 의한 유도전동기의 3단 속도제어에 관한 연구)

  • Je, Hae-Yeong;Kim, Su-Un
    • Proceedings of the KIEE Conference
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    • 1983.07a
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    • pp.79-82
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    • 1983
  • 상변환에 의한 농형유도전동기의 1/3, 2/3 속도제어 방법에 대하여 연구하였고, 종래의 국수변환 방법과 비교하였다. 1마력, 36슬롯을 모델로 하여 1800, 1200, 600rpm을 얻어 내었으며, 국수변환 방법에 비하여 고정자의 크기, 슬롯수, 동량을 줄일 수 있는 장점을 가지고 있었다.

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