• Title/Summary/Keyword: Installation time

Search Result 2,012, Processing Time 0.035 seconds

A study on real time measuring microscopic movements in sinusoidal phase modulating interferometry using a laser diode (레이저 다이오드를 이용한 정현파 위상변조 간섭에 의한 실시간 극미세 진동 측정에 관한 연구)

  • 구자남;염정덕;지철근
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
    • /
    • 1990.10a
    • /
    • pp.23-27
    • /
    • 1990
  • A new signal processing system for real time displacement measurement in sinusoidal phase modulating interferometry is described. Although sinusoidal phase modulating interferometry is effective in measuring with high accuracy the displacement of an object, conventional signal processing takes a long time. In this method, detection of the object's displacement is easily achieved by sampling the interference signal at those times that satisfy certain conditions and by processing the sampled signals with electric circuits in real time. The delay time of this signal processing system is < 45${\mu}$s. Specially in this paper we describe all electronic circuit and optical system design

  • PDF

A Study of False Contour Noise in Moving Images through Consideration of the Phosphor Decay Time of AC PDP

  • Jeong, Dong-Cheol;Moon, Cheol-Hee
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
    • /
    • v.21 no.9
    • /
    • pp.12-17
    • /
    • 2007
  • The dynamic false contour noise was analyzed with consideration for the phosphor decay time of an ac PDP by computer simulation based on the measurement of the 1/10 phosphor decay times of the primary colors red, green and blue at the main wavelengths of each phosphor. The noise level of dynamic false contour is strongly dependent on phosphor decay time. The noise level decreases incrementally with the phosphor decay time, whereas the noise width increases. The moving velocity of an object does not affect the noise level. The entire experiment was performed under the condition of 8 subfields ADS driving scheme, 2.5[${\mu}sec$] scan speed, and 5[${\mu}sec$] sustain period with VGA grade panel.

A study on real time measuring microscopic movements in sinusoidal phase modulating interferometry using a laser diode (레이저 다이오드를 이용한 정현파 위상변조 간섭에 의한 실시간 극미세 진동 측정에 관한 연구)

  • 강성철;진상규;지철근
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
    • /
    • 1991.10a
    • /
    • pp.33-37
    • /
    • 1991
  • A now signal precessing system for real time displacement measurement in sinusoidal phase modulating interferometry is described. Although sinusoidal phase modulating interferometry is effective in measuring with high accuracy the displacement of an object, conventional signal processing takes along time. In this method, detection of the object's displacement is easily achieved by sampling the interference signal at those times that satisfy certain conditions and by processing the sampled signals with electric circuits in real time. the delay time of this signal processing system is < 45 $\mu$s. Specially in this paper we describe all electronic circuit and optical system design

  • PDF

Design of the Controllers for the Improved Response of Time Delay Systems (시간지연 시스템의 응답특성 개선을 위한 제어기 설계)

  • Lee, Suk-Won;Yang, Seung-Hyun
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
    • /
    • v.19 no.7
    • /
    • pp.15-19
    • /
    • 2005
  • The practical control problems for the lime-delay system is considered. The delay-free characteristics of the Smith Predictor is available only when both the process and it's model are exactly matched. So it does not used widely in practical industrial processes. In this paper, using the 2nd-order plus dead time model in place of the plant model of the Smith Predictor, the proposed controller shows the improved performance in case of the very long time delay. And the range of integral constant of the PI controller is also proposed.

Reconstruction of the Electron Density Profile in O-mode Ultrashort Pulse Reflectometry using a Two-dimensional Finite Difference Time Domain

  • Roh, Young-Su
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
    • /
    • v.27 no.7
    • /
    • pp.52-58
    • /
    • 2013
  • The two-dimensional finite difference time domain algorithm is used to numerically reconstruct the electron density profile in O-mode ultrashort pulse reflectometry. A Gaussian pulse is employed as the source of a probing electromagnetic wave. The Gaussian pulse duration is chosen in such a manner as to have its frequency spectrum cover the whole range of the plasma frequency. By using a number of numerical band-pass filters, it is possible to compute the time delays of the frequency components of the reflected signal from the plasma. The electron density profile is reconstructed by substituting the time delays into the Abel integral equation. As a result of simulation, the reconstructed electron density profile agrees well with the assumed profile.

Real Time Simulator for a Permanent Magnet Synchronous Motor with Power Converter (전력변환기를 이용한 영구자석 동기전동기용 실시간 시뮬레이터)

  • Oh, Hyun-Cheal;Kim, Hag-Wone;Cho, Kwan-Yuhl
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
    • /
    • v.27 no.12
    • /
    • pp.114-124
    • /
    • 2013
  • Recently, the real time simulator to develop the inverter drive board and motor control algorithm for high power induction motor and PM synchronous motor is required. In this paper, the real time simulator based on the voltage control for a PM synchronous motor is proposed. The resistor, inductor, and the induced voltage for the modeling of a PM synchronous motor is implemented by the power converter including the LCL filter and the PWM rectifier. The induced voltage of a PM synchronous motor is simulated by the capacitor voltage of the LCL filter, which is controlled by PI voltage controller and the deadbeat current controller. The operation and the simulated characteristics of the proposed real time simulator for a PM synchronous motor is verified by the simulation.

A Study on the Aerated Submerged Fixed-Film Bioreactor for Military Installation Wastewater Treatment (군용시설물(軍用施設物) 폐수처리(廢水處理)를 위한 고정생물막공법(固定生物膜工法)의 연구(硏究))

  • Suh, Hyung Suk;Ryu, Seong Ho
    • Journal of Korean Society of Water and Wastewater
    • /
    • v.7 no.1
    • /
    • pp.37-45
    • /
    • 1993
  • This research was performed to examined the applicability of a fixed-biofilm process for the wastewater treatment of military installations. Utilizing plastic net media, synthetic wastewater-average $BOD_5$ cocentration was $192mg/l$ treated in the three sets of reactors that have 8 hours, 6 hours, and 4 hours of hydraulic retention time. The results of this experiment showed that the biofilm was not detached easily, and the reactor was not closed by excess biomass. The average soluble $BOD_5$ concentrations of effluent were $6.0mg/l$ with 8 hours of retention time, $11.3mg/l$ with 6 hours of retention time, and $19.4mg/l$ with 4 hours of retention time. Especially it was reduced to $5.7mg/l$ in the second stage reactor with 4 hours of retention time. These resulted that the fixed-biofilm process could be adapted for the treatment of military installation wastewater.

  • PDF

Power System Stability Analysis Using a Hybrid Approach (하이브리드 방법을 이용한 전력계통 안정도 해석)

  • Seo, Gyu-Seok;Park, Ji-Ho
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
    • /
    • v.24 no.10
    • /
    • pp.21-25
    • /
    • 2010
  • This paper explains hybrid method that combines Time domain simulation technique with the direct method of Transient stability analysis. First, it calculate trajectory of real system by Time domain Simulation using OOP(Object Oriented Programming method) and evaluate Transient Energy Function to induce stability index to calculate Transient stability margin. Once the status of system(stable or unstable) has been identified, proper criteria are proposed to stop time-domain simulation to reduce CPU time.

The Study on the Cycling Time for Interbus (인터버스 순환시간 측정에 대한 연구)

  • Park, Jang-Hwan
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
    • /
    • v.18 no.6
    • /
    • pp.170-175
    • /
    • 2004
  • The test on the cycle time of the Interbus, widely used in automobile industry, is evaluated in this paper. The measurement of cycle time is a very Important factor for performance of Interbus. The test was performed by the under normal circumstances and circumstances with EMC. The theoretical cycle time which was derived from mathematical form and from real system with Interbus approach to nearly result. As a result, it is shown that Interbus is deterministic, rapid and reliable system.

The Development of Real-Time Harmonic Analysis Algorithm in Distribution Transformer (배전용 변압기의 실시간 고조파 분석 알고리즘 개발)

  • Park, Chul-Woo
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
    • /
    • v.27 no.3
    • /
    • pp.43-49
    • /
    • 2013
  • Recently harmonics flowing into power system is increasing as the usage of semiconductor equipments and switching mode power equipments are increasing. Harmonics cause problems such as heat increasing and reduction in capacity of transformers, especially the harmonics flowing into a distribution transformer can lead to the lifetime reduction of transformer. In this paper, we are about to develop a device that can monitor harmonics in real-time as it is affixed to a distribution transformer. Unlike the existing expensive harmonic analysis device, a new harmonic analysis algorithm is proposed in order to implement low-cost equipment. The real-time harmonic analysis algorithm proposed in this paper allows implementation on low performance microcontrollers, thus it can monitor the harmonic in real-time as it is individually affixed to the transformer. Therefore, it would improve the reliability of the transformer and stable power system operation would be possible as it can prevent the transformer accidents in advance.