• Title/Summary/Keyword: Response correction

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A New Empirical Investigation of Employment, Wages and Output -A Comparative Study of the US and Japan-

  • Sung, Jaewhan
    • Journal of Labour Economics
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    • v.21 no.2
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    • pp.17-46
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    • 1998
  • In this paper, I pursue an empirical analysis of different patterns of employment and wage adjustments to demand changes for the US and Japan. Analyzed are the data in the 70's and 80's, the period that the two countries are believed to show most conspicuous diverging patterns. Using the framework of cointegration and error correction, I establish that in the US it is employment level, while in Japan it is wages, that is more responsive to output fluctuations both in the long run and the short run. All the comparisons on the long run relationships are estimated and tested based on the system cointegrating regressions, and the transition from the short run to the long run responses are investigated using impulse response analysis of the error correction models. I also study differences across genders and establishment sizes within each country. For males and females in Japan, the adjustments are significantly different both in the long run and the short run, but for the firms of different sizes they diverge only in the short run. In contrast to some of the earlier work, the gender effect turns out to be insignificant in the US.

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Characteristics of Boost Active Power Factor Correction Converter (부스트 능동 역률개선 컨버터의 특성)

  • Jang, Jun-Young;Lin, Chi-Ho
    • Journal of Institute of Control, Robotics and Systems
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    • v.21 no.12
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    • pp.1152-1159
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    • 2015
  • Switching power supply systems are widely used in many industrial fields. Power factor correction (PFC) circuits have a tendency to be applied in new power supply designs. The PFC circuit with a boost converter using an input power source is studied in this paper. In a boost PFC circuit, there are two feedback control loops: a current feedback loop and a voltage feedback loop. In this paper, the regulation performance gained by using the output voltage and compensator to improve the transient response presented at the continuous conduction mode (CCM) of the boost PFC circuit is analyzed. The validity of the designed boost PFC circuit is confirmed by both MATLAB simulation and experimental results.

Correction of Fluctuation Pressure by Tube System (튜브시스템에서 변동풍압의 보정)

  • You, Ki-Pyo;Kim, Young-Moon
    • Journal of Korean Association for Spatial Structures
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    • v.2 no.1 s.3
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    • pp.67-73
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    • 2002
  • Measurement of fluctuating pressure by tube system is carefully designed due to the organ-pipe resonance. It is necessary to correct the pressure before analysis. The three method for correction the distortion fluctuation pressure short tube length and the frequency response functions and insert a restrictor in the tube to increase the damping. The first method is useful when the tube length is short. In second method, the distorted signal through the tubing transformed into the frequency domain, dividing by transfer function and inverse fourier transforming back into the time domain gives the required pressure signal. In this paper three types of tubing which have different length of 100cm, 150cm, 200cm were experimented the distorted signal and correct the distortion signal

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FIR ROOM RESPONSE CORRECTION SYSTEM (FIR 필터를 사용한 청취 환경 보정 시스템)

  • Arora Manish;Sung Ho-Young;Lee Hyuck-Jae;Lee Joon-Hyon
    • Proceedings of the Acoustical Society of Korea Conference
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    • autumn
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    • pp.283-286
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    • 2004
  • Due to advances in electronics very high quality audio reproduction is today possible. But the listening environment causes deviation of the audio system from the expected behavior. Firstly the listening Room significantly changes the audio signal frequencies and their phase. Secondly the position of the user in the room affects the perceived sound. With existing DSP technology it is possible to adequately correct these effects. In our work we developed a room correction system, correcting up to 7.1 channels using dual Motorola 56367 fixed point DSP's, implementing position dependent room effects measurement, real time compensation filter design and equalization filtering procedures.

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A Study on Benefit Sides of Demand Response Customer Baseline with Outdoor Temperature Variable about Load Aggregator (수요관리사업자에 대한 외부온도 변화에 따른 수요반응 CBL의 편익에 관한 연구)

  • Kim, Seong-Cheol;Song, Ha-Na
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.28 no.3
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    • pp.44-50
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    • 2014
  • This paper describes reasonable methods by considering change of outdoor temperature into Customer Baseline Load(CBL) of Demand Resources in Smart Demand Resource Market, which controls peak power demand and maintains reliability of power system. The Smart Demand Resouce Market, which KPX(Korea Power Exchange) implement, is explained and then effects for CBL calculated by considering temperature correction factor are established. Finally, four methods for calculation of CBL are proposed and those results are compared and analyzed.

Analysis ana Correction of Experimental Errors in Pseudodynamic Test (유사동적실험 오차의 분석 및 보정)

  • 김남식;이상순;정우정;이동근
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 1992.04a
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    • pp.95-101
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    • 1992
  • The Pseudodynamic test is a new experimental technique for simulating the earthquake response of structures or structural components in the time domain. It is especially efficient for testing structures that are too large, heavy or strong to be tested on a shaking table. But the obtained responses in the Pseudodynamic test are distorted by the experimental errors inevitably during control and measurement procedures. The studies are to investigate the effects of the experimental errors on the Pseudodynamic responses and apply a correction method to the Pseudodynamic testing algorithm. It is shown that the corrected responses using the Equivalent Energy Compensation Method are in a good correlation with the theoretical ones. Thus, the corrected Pseudodynamic responses could be reliable for evaluating the seismic performance of structural systems.

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A study on the thickness correction for symmetrical inductive irises with rounds in rectangular waveguides (구형도파관내의 라운드를 갖는 대칭형 인덕티브 아이리스에 대한 두께 보정에 관한 연구)

  • 유경완;박광량;김재명
    • Journal of the Korean Institute of Telematics and Electronics A
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    • v.32A no.6
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    • pp.1-9
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    • 1995
  • The structures of inductive irises are used commonly in waveguide filter, especially at highter frequencyies, due to low loss and high temperature stability. However, the iris thickness can not be neglected, as it could be at the lower frequencies. Approximate models assuming zero thickness fail to predict the exact behavior of the filter. And current thickness correction is introduced which is valid in the case of thick irises only. Account of the effect of round is normally not taken. So the necessity of finding a relation for the two factors-iris thickness and round-arises in the design of waveguide filters. This paper describes a mutual relation that considers the combined effect of finite thickness and round from the start. In order to test the validity of the changed relation, weveral examples are given. And the measured response of each case is then compared with the predicted reponse. And it is shown that the radius is of perceptible influence on the transmission coefficient through a thick iris.

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A Study on the Characteristics of Control Schemes for STATCON (STATCON 제어방식에 따른 특성 연구)

  • Han, Y.S.;Cha, J.D.;Hong, S.W.;Lee, H.S.;Moon, K.W.;Yoon, S.H.
    • Proceedings of the KIEE Conference
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    • 1998.07f
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    • pp.2076-2078
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    • 1998
  • This paper presents STATCON(Static Condenser) control schemes for voltage regulation, power factor correction and harmonics mitigation. Each control scheme can be applied in the system depending on the system requirements. The 20KVA STATCON is developed and tested in the reduced system model for the verification of three different control algorithms. The results of proposed controls are compared for power factor correction and voltage regulation algorithms. For each algorithm, harmonic mitigation scheme is adopted as a part of control. Finally verification of STATCON for the transient response is implemented by voltage flicker test.

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Analytical solutions to piezoelectric bimorphs based on improved FSDT beam model

  • Zhou, Yan-Guo;Chen, Yun-Min;Ding, Hao-Jiang
    • Smart Structures and Systems
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    • v.1 no.3
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    • pp.309-324
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    • 2005
  • This paper presents an efficient and accurate coupled beam model for piezoelectric bimorphs based on improved first-order shear deformation theory (FSDT). The model combines the equivalent single layer approach for the mechanical displacements and a layerwise modeling for the electric potential. General electric field function is proposed to reasonably approximate the through-the-thickness distribution of the applied and induced electric potentials. Layerwise defined shear correction factor (k) accounting for nonlinear shear strain distribution is introduced into both the shear stress resultant and the electric displacement integration. Analytical solutions for free vibrations and forced response under electromechanical loads are obtained for the simply supported piezoelectric bimorphs with series or parallel arrangement, and the numerical results for various length-to-thickness ratios are compared with the exact two-dimensional piezoelasticity solution. Excellent predictions with low error estimates of local and global responses as well as the modal frequencies are observed.

Structural Vector Error Correction Model for Korean Labor Market Data (구조적 오차수정모형을 이용한 한국노동시장 자료분석)

  • Seong, Byeongchan;Jung, Hyosang
    • The Korean Journal of Applied Statistics
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    • v.26 no.6
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    • pp.1043-1051
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    • 2013
  • We use a structural vector error correction model of the labor market to investigate the effect of shocks to Korean unemployment. We associate technology, labor demand, labor supply, and wage-setting shocks with equations for productivity, employment, unemployment, and real wages, respectively. Subsequently, labor demand and supply shocks have significant long-run and contemporaneous effects on unemployment, respectively.