• 제목/요약/키워드: DOBLE

검색결과 27건 처리시간 0.024초

분산 전원 계통 연계용 보호 IED 설계를 위한 실험 연구 (Experimental Research for Design of Distributed Power System Protection IED)

  • 한철완;오성남;윤기돈;김갑일;손영익
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2005년도 심포지엄 논문집 정보 및 제어부문
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    • pp.90-92
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    • 2005
  • In this paper, we design a digital protection IED(Intelligent Electric Device) for a distributed power system in connection with power grid. The device can measure various elements for protection and communicate with another devices through network. The protection IED is composed of specific function modules: signal process module which converts analog signal from PT and CT handle algorithm to digital one; communication module for connection with another IEDs; input/output module for user-interfaces; main control module for control the whole modules. A general purpose DSP board with TMS320C2812 is used in the IED. Experiments with the power system simulator DOBLE have been made to verily the proposed hardware system.

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분산 전원 계통 연계용 보호 IED의 설계 및 구현 (Realization of Protection IED for Distributed Power System)

  • 한철완;오성남;김갑일;손영익
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2005년도 학술대회 논문집 정보 및 제어부문
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    • pp.517-519
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    • 2005
  • In this paper, we consider a digital protection IED(Intelligent Electric Device) for a distributed power system. The IED can measure various elements for protection and communicate with another devices through network. The protection IED is composed of specific function modules: signal process module which converts analog signal from PT and CT handle algorithm to digital one; communication module for connection with another IEDs; input/output module for user-interfaces. A general purpose DSP board with TMS320C2812 is used in the IED. In order to verify the proposed IED, experimental researches with the power system simulator DOBLE has been carried out for a phase earth fault. The results show an under-voltage relaying algorithm has been realized sucessfully in the hardware system.

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Double Unit Root Tests Based on Recursive Mean Adjustment and Symmetric Estimation

  • Shin, Dong-Wan;Lee, Jong-Hyup
    • Journal of the Korean Statistical Society
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    • 제30권2호
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    • pp.281-290
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    • 2001
  • Symmetric estimation and recursive mean adjustment are considered to construct tests for the doble unit root hypothesis for both parametric and semiparametric time series models. It is shown that simultaneous application of symmetric estimation and recursive mean adjustment yields the most powerful test. Moreover, size property of the semiparametric test based on the simultaneous application is bet among all semiparametric tests.

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80C196KC를 이용한 과전류 계전 알고리즘 구현 (Implementation of an Over-Current Relaying Algorithm Using 80C196KC)

  • 김형규;이봉현;강상희
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2007년도 제38회 하계학술대회
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    • pp.495-496
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    • 2007
  • An Over Current Relayng algorithm using 80c196kc micro processor was realized in this paper. This OCR Algorithm was verified with simulated fault signal. The fault signal was made by EMTP and realized by DOBLE to compare H/W test with S/W test. This simulations showed similar result between H/W and S/W test.

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압축기 익렬 성능해석을 위한 알고리즘과 난류모델의 비교

  • 김석훈;이기수;최정열;김귀순;김유일;임진식
    • 한국추진공학회:학술대회논문집
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    • 한국추진공학회 2000년도 제14회 학술강연논문집
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    • pp.29-29
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    • 2000
  • 가스터빈 엔진의 성능을 제대로 예측하기 위해서는 먼저 주요 구성품인 압축기, 터빈 등의 성능 자료가 충분히 알려져 있어야 한다. 특히 압축기는 조건의 변화에 따라 성능변화가 크므로 엔진 성능예측시 압축기 성능특성은 매우 중요한 요소라 할 수 있다. 압축기의 경우, 유동의 특성상 역압력 구배로 인한 유동의 박리가 발생하는 등 유동현상이 매우 복잡해진다. 이와 같은 2차원 압축기 익력 성능예측을 위하여 압축성, 비압축성 수치해석기법 및 난류 모델을 DCA(doble circular arc) 아음속 압축기 익렬에 적용하여 실험 결과와 비교 검토하였다.

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자기정렬공정에 의한 GaAs/AlGaAs 광위상변조기의 제작 및 특성 측정 (Chatacterization of GaAs/AlGaAs optical phase modulator fabricated by self-aligned process)

  • 김병성;정영철;변영태;박경현;김선호;임동건
    • 한국광학회지
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    • 제7권3호
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    • pp.287-294
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    • 1996
  • MOCVD(metal-organic chemical vapour deposition)방법으로 성장시킨 이중 이종접합구조 GaAs/AlGaAs 웨이퍼를 이용하여 광위상변조기를 제작하였다. 제작과정에서 도파로와 절연층의 형성시 동일 포토레지스트 패턴을 이용하는 자기종렬공정을 개발하여 그 효용성을 입증하였다. Fabry-Perot 간섭법을 이용하여 변조기의 위상변조효율을 측정하였으며 1.31.mu.m파장에서 TE 편광의 경우 22.5.deg./Vmm의 위상변조특성을 얻었다.

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RVEGA SMC를 이용한 Ball-Beam 시스템의 안정화 (Stabilization of Ball-Beam System using RVEGA SMC)

  • 김태우;이준탁
    • 대한전기학회논문지:전력기술부문A
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    • 제48권10호
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    • pp.1327-1334
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    • 1999
  • The stabilization control of ball-beam system is difficult because of its nonlinearity and structural unstability. Futhermore, a series of classical methods such as the PID and the full state feedback controller(FSFC) based on the local linearizations have narrow stabilizable regions. At the same time, the fine tunings of their gain parameters are also troublesome. Therefore, in this paper, three improved design techniques of stabilization controller for a ball-beam system were proposed. These parameter tuning methods in the double PID controller(DPIDC), the FSFC and the a sliding mode controller(SMC) were dependent upon the Real Value Elitist Genetic Algorithm (RVEGA). Finally, by applying the DPIDC, the FSFC and the Real Variable Elitist Genetic Algorithm based Sliding Mode Control(RVEGA SMC) to the stabilizations of a ball-beam system, the performances of the RVEGA SMC technique were showed to be superior to those of two other type controllers.

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Warm standby 고장김내 구조를 지원하는 교환 제어 시스템에서의 가동률 분석 (An availability analysis of switching control system with warm standby fault tolerant architecture)

  • 송광석;여환근;한창호;문태수;이광배;김현욱;윤충화
    • 한국통신학회논문지
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    • 제21권8호
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    • pp.1989-2002
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    • 1996
  • In this paper, we describe several warm standby fault-tolerant models and their operation methods applicable to telephone switching control systems which have dual module structure and need high availability. Unavailabilities of the system implemented by four different methods for each model are computed by using the Markov state model, and then are compared for system performance evaluation. As the results ofsimulations, the warm standby model with triple processors is best in the aspect of data loss, while in most cases the warm standby model with doble processors based on no standby check method provides the highest system avaiability. Periodic changeover increases the system unavailability, but the preriodic standby check on standby module decreases the system unavailability of warm standby model with a single processor and with double processors. On the other hands, the variationas of warm standby model with a single processor and with double processors. On the other hand, the variations of data recovery time and personnel recovery rate have little effect on the system unavailtability.

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The Classification and Age Determination of Ballpoint Pen Inks in Questioned Documents

  • Kim, Nam Yee;Park, Sung Woo;Doble, Philip;Roux, Claude
    • 분석과학
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    • 제17권3호
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    • pp.271-277
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    • 2004
  • The aim of this study was to investigate questioned documents written with blue or black ballpoint pen on paper by nondestructive technique. In this work, 21 blue and 22 black ballpoint pen inks which were purchased on different brands were analyzed by using Microspectrophotometry (MSP). The reflectance spectra were obtained from these ink samples and their shapes and the wavelength of the maximum intensity were compared. In the blue and black ballpoint pen inks, the discriminating powers (DP) were 0.85 and 0.61, respectively. The changes of the reflectance intensity at their wavelength of maximum intensity and their shapes appeared according to the exposure time to sunshine in a laboratory, especially in the blue ballpoint pen inks. Therefore it is possible to distinguish ink entries on the same paper with the relative age in case of questioned letters written with blue ballpoint pen.

PSCAD/EMTDC를 이용한 거리계전기 동특성 시험에 관한 컴포넌트 모델 개발 (Development of User-defined Components for Dynamic Test of Distance Relay Models Using PSCAD/EMTDC)

  • 이홍학;이태영;김호표;노장현;강근수;장성훈;이재욱
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2003년도 추계학술대회 논문집 전력기술부문
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    • pp.242-244
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    • 2003
  • The functional test of protection relays is divided into two kind of test types; the steady-state test and dynamic test. Because the steady-state test is comparatively easy, this test is used to test the characteristics of the relaying elements, operating values, resetting values and etc. using equipment such as Doble. But the dynamic test has to be performed on the test environment with RTDS(real time digital simulator) because of the dynamic characteristics of real protection relays. Therefore, it is not usually easy to perform dynamic test of relays using power system simulation tool based on PC(personal computer) such as PSCAD/EMTDC. This paper discusses how to develop and implement a test model and user-defined components that can be performed dynamic test using PSCAD/EMTDC.

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