• 제목/요약/키워드: Power assistant

검색결과 100건 처리시간 0.028초

Test of Normality Based on the Transformed Lorenz Curve

  • Kang, Suk-Bok;Cho, Young-Suk
    • Communications for Statistical Applications and Methods
    • /
    • 제6권3호
    • /
    • pp.901-908
    • /
    • 1999
  • Using the Transformed Lorenz curve which is introduced by Cho et al.(1999) we propose the test statistic for testing of normality that is very important test in statistical analysis and compare the proposed test statistic with the Shapiro and Wilk's W test statistic in terms of the power of test through by Monte Carlo method.

  • PDF

MTCMOS Post-Mask Performance Enhancement

  • Kim, Kyo-Sun;Won, Hyo-Sig;Jeong, Kwang-Ok
    • JSTS:Journal of Semiconductor Technology and Science
    • /
    • 제4권4호
    • /
    • pp.263-268
    • /
    • 2004
  • In this paper, we motivate the post-mask performance enhancement technique combined with the Multi-Threshold Voltage CMOS (MTCMOS) leakage current suppression technology, and integrate the new design issues related to the MTCMOS technology into the ASIC design methodology. The issues include short-circuit current and sneak leakage current prevention. Towards validating the proposed techniques, a Personal Digital Assistant (PDA) processor has been implemented using the methodology, and a 0.18um process. The fabricated PDA processor operates at 333MHz which has been improved about 23% at no additional cost of redesign and masks, and consumes about 2uW of standby mode leakage power which could have been three orders of magnitude larger if the MTCMOS technology was not applied.

광섬유전송에 의한 Zircaloy-4 봉단마개밀봉의 Nd:YAG LBW의 최적조건에 관한 연구 (A study on the Optimum Conditions of Nd:YAG LBW for Zircaloy-4 End Cap Closure By Optical Fiber Transmission)

  • 김수성;김웅기;이영호
    • Journal of Welding and Joining
    • /
    • 제15권6호
    • /
    • pp.85-95
    • /
    • 1997
  • This study is to investigate the optimum conditions of Nd:YAG laser beam welding for Zircaloy-4 end cap closure by optical fiber transmission. Laser welding parameters which affect the penetration depth and bead width were experimentally examined using the various beam radius by the beam quality analyzer, joint geometries of end cap and the laser parameters which mean pulse width, repetition rate and pulse energy. Also, an optimum welding speed and the effect of assistant gas with varying the flow rate of He were investigated. We found that the laser average power for the end cap welding will be 230W and rotation speed must not exceed 8 RPM, the best position of focus using optical fiber with 600.mu.m will be 2 to 3mm below the surface of the material.

  • PDF

밸브 구동용 고속 리니어 액추에이터 (A Design of High-Speed Linear Actuator for Valve)

  • 성백주
    • 유공압시스템학회논문집
    • /
    • 제8권1호
    • /
    • pp.1-9
    • /
    • 2011
  • The main design factors which effect on operating speed of linear actuator for valve operation are mass of plunger, electromagnetic motive force, inductance, and return spring, and these factors are not independent but related with each other in view point of design and electromagnetic theory. It is impossible to increase the operating speed by only change the value of any one design factor. The change of any one value results in change of any value related it in various design factors. This paper presents a speed increasing method of linear actuator using a solenoid design method by some governing equations which are composed of electromagnetic theory and empirical knowledge and permanent magnets as assistant material, and proved the propriety by experiments.

디지털방식 다중제어 충전기 개발 (Development of Digital Type Battery Charger based on Multi-Mode Control)

  • 변영복;구태근;김은수;조기연;김동희;변동환
    • 전력전자학회:학술대회논문집
    • /
    • 전력전자학회 2001년도 전력전자학술대회 논문집
    • /
    • pp.308-311
    • /
    • 2001
  • Most of the battery charger for electric powered forklift truck are controlled by the method of 3-phased constant current and constant voltage. However, these chargers have several disadvantages like a large charger capacity, and a short battery life time. This paper presents a digital type battery charger based on multi-mode control adding a constant power control and several assistant controls in the conventional control. The whole control system is performed by a low cost one-chip micro-controller and completely digitize. So we can get a high precision control and a good reliability.

  • PDF

An Evaluation of the Accuracy of Maximum Likelihood Procedure for Estimating HIV Infectivity

  • Um, Yonghwan;Haber, Michael-J
    • Communications for Statistical Applications and Methods
    • /
    • 제6권3호
    • /
    • pp.957-966
    • /
    • 1999
  • We evaluate the accuacy and precision of maximum likelihood estimation procedures for infectivity of HIV in partner studies. This is achieved by applying the oricedyre typothetical samples generated by computer. One hundred samples were generated with various combinations of parameters. The estimation procedure was found to be quite accurate. in addition it was found that the power of the test for equality of infectivities for two types of contact depends on sample size and length of observation period but not on the number of observations made on each subject. Tests based on a model for the infectivity had higher power than standard methods for comparing proportions.

  • PDF

Rapid Dynamic Response Flyback AC-DC Converter Design

  • Chang, Changyuan;Wu, Menglin;He, Luyang;Zhao, Dadi
    • Journal of Power Electronics
    • /
    • 제18권6호
    • /
    • pp.1627-1633
    • /
    • 2018
  • A constant voltage AC-DC converter based on digital assistant technology is proposed in this paper, which has rapid dynamic response capability. The converter operates in the PFM (Pulse Frequency Modulation) mode. According to the load state, the compensation current produced by the digital compensation module was injected into the CS pin to adjust the switching pulse width dynamically and improve the dynamic response. The control chip is implemented based on NEC $1{\mu}m$ 5V/40V HVCMOS process. A 5V/1.2A prototype has been built to verify the proposed control method. When the load jumps from idle to heavy, the undershoot time is only 7.4ms.

C-EPS (C-type Electric Power Steering) 시뮬레이터 설계 및 제어 알고리즘 개발 (Design of C-EPS (Column type - Electric Power Steering) Simulator and Development of Control Algorithm)

  • 박명욱;문희창;김정하
    • 제어로봇시스템학회논문지
    • /
    • 제16권6호
    • /
    • pp.566-571
    • /
    • 2010
  • EPS (Electric Power Steering) is important device for improving vehicle's dynamics and static performances. This paper deals with simulator design for C-EPS (Colum type-EPS), development assist and returnability control algorithm. First, C-EPS system model was simply designed because EPS system is complex control system that has many unknown variables. These parameters were simplified through assumptions. Second, C-EPS simulator was designed for development of control algorithm. This simulator has SAS (Steering Angle Sensor), dual torque sensor, dual load cell for measuring rack force, dual linear actuator for generating tire force and Data Acquisition System. Using this simulator, control methods ware tested. Third, control algorithm was designed for torque assist and returnability. Assist torque map and returnability torque map were found by lots of simulation test. These torque maps were tuned for EPS actuator control. The simulation result was compared with non-EPS system result. In this research, the C-EPS simulator was designed for development of control algorithm about torque assistant and returnability. Using this simulator, control algorithm was improved.

C-dump Converter에 의한 차량용 스위치드 릴럭턴스 전동기 구동 시스템의 고성능제어 (High Performance Control of Switched Reluctance Motor Drive System for Automobiles by C-dump Converter)

  • 김도군;윤용호;이태원;원충연;김영렬
    • 전력전자학회:학술대회논문집
    • /
    • 전력전자학회 2003년도 춘계전력전자학술대회 논문집(2)
    • /
    • pp.860-865
    • /
    • 2003
  • Recently, SRMs are used in automobiles for power assistant steering, accessory motion control and traction drives. Especially in the motion control and traction drives, safety and efficiency are of paramount important. The paper describes the essential elements, faced in designing and constructing drive circuits for a switched reluctance motor for automobiles. These converters will be referred to as energy efficient C-dump converter and modified C-dump converter Energy efficient C-dump converter topology eliminate all the disadvantages of the C-dump converter without sacrificing its attractive features, and also provide some additional advantages that have lower number of power devices, full regenerative capability, free-wheeling in chopping or PWM mode, simple control strategy, and faster demagnetization during commutation. The experiments are peformed to verify the capability of proposed control method on 6/4 salient type SRM.

  • PDF

Fuzzy 제어기 기반의 무체인 파워 보조 자전거 개발 (Development of a Fuzzy Control Based Chainless PAS Bicycle)

  • 정회성;김관형;이형기
    • 한국지능시스템학회논문지
    • /
    • 제22권1호
    • /
    • pp.119-125
    • /
    • 2012
  • 본 논문은 친환경 교통수단인 일반적인 체인형 자전거(Bicycle)를 대신할 수 있는 무체인(Chainless) 지능형 파워 보조 시스템(Power Assistant System)을 설계하여 자전거 운전상태에 맞추어 필요한 동력을 지원할 수 있는 전기자전거 모델을 제안 하고자 한다. 무체인 지능형 파워 보조 시스템의 답력 센서(sensor)를 통하여 자전거의 운전상태를 지능적으로 파악 할 수 있는 퍼지제어 알고리즘을 설계하고, 자전거 운전상태에 대한 파워 보조 시스템의 보조 동력을 제어하도록 하였다. 본 논문에서는 사람의 답력에만 의존하는 일반 자전거 시스템에 보조동력을 제공하는 무체인 지능형 전기자전거 모델을 설계하여 제시하였다.