• Title/Summary/Keyword: Frequence Response

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Optical Receiver Design For Optical Communication Using Cascoded Amplifier with Inductor Peaking Technique (케스코드 증폭기와 인덕터 피킹기술을 이용한 광통신용 광 수신기의 설계)

  • 박정식;이강승;정윤하
    • Proceedings of the IEEK Conference
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    • 1999.06a
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    • pp.305-308
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    • 1999
  • In this paper, a transimpedance optical receiver based on PIN/P-HEMT with cascoded input stage and inductor peaking technique was designed for several giga bits optical communication. Analysis of the receiver shows that cascoded input stage with inductor peaking increase bandwidth without sacrificing low frequence gain. The receiver achieved a low noise characteristic and maximally flat frequence response. It is shown that the 3-dB bandwidth of the designed receiver is 8.3 ㎓ and input equivalent noise current is as low as 16pA/√Hz to 10㎓.

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The Frequence Band on the Pizoelectric Characteristic of the Piezoelectric Ceramic Filter (압전 세라믹 필터의 압전 특성에 의한 대역폭 의존성에 관한 연구)

  • Lee, S.H.;Seok, J.Y.;Ha, S.J.;Ryu, G.H.;Kim, H.G.;Yoo, J.H.
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2002.07b
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    • pp.613-617
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    • 2002
  • The ceramic filters were developed using technology similar to that of quartz crystal and electromechanical filter. However, the key to this development involved the theoretical analysis of vibration modes and material improvements of piezoelectric ceramics. The primary application of ceramic filters has been for consumer-market use. Accordingly, a major emhpasis has involved mass production technology, leading to low-priced devices. A typical ceramic filter includes monolithic resonators and capacitors packaged in unique configurations. Nakazawa developed a double-mode resonator as two acoustically coupled single resonators. And he developed 10.7MHz crystal filters using multi-energy trapping mode of thickness shear vibration. He succeeded in realizing a two-pole band pass filter response without external inductance by splitting a dot electrode to creat coupled symmetric and antisymmetric vibration modes. Accordingly, the simulation for ceramic filter were important. So that, this paper were investigated the pass frequency of filter on the electrode length and thickness of ceramic.

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A Multivariable control design using CDM (CDM을 이용한 다변수 시스템의 제어기 설계)

  • Jung, Dong-Keun;Song, Jeong-Hwa;Kim, Young-Chol
    • Proceedings of the KIEE Conference
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    • 1998.11b
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    • pp.417-419
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    • 1998
  • The ICD(Individual-Channel-Design) is a multivariable control design method based on the classical frequence response, in which the channel decomposition and the loop shaping on frequence domain are introduced. However, in this manner, it is difficult to satisfy time domain specifications such as overshoot, rise time, settling time. To solve the problem, we propose a new design method using CDM(Coefficient Diagram Method). And a new feedforward compensator is introduced for reducing interconnections.

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Frequency Response Method Based Controller Design of High-Speed Pantograph for Improving Transient Response (과도응답 개선을 위한 고속 팬터그래프의 주파수 응답 기법 기반 제어기 설계)

  • Lee, Joo-Won;Jo, Nam-Hoon
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.27 no.7
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    • pp.95-100
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    • 2013
  • In this paper, we propose an active controller for high-speed pantograph in order to improve the transient response. Electrical power is delivered from a catenary to the train via a pantograph and thus it is very important to regulate the contact force between catenary and pantograph. By regarding the catenary displacement as an unknown disturbance input and analyzing the frequency response from the disturbance to contract force. we present an active controller that utilizes the lead compensator and resonant controller. It is shown by the computer simulation that the substantial improvement in transient response can be achieved by the proposed controller.

Dynamic Analysis for Performance Improvement of Line Center (라인센터의 성능향상을 위한 동특성 해석)

  • Cheong, Seon-Hwan;Choi, Seong-Dae;Kweon, Hyun-Kyu;Shon, Jae-Yool
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.2 no.2
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    • pp.75-83
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    • 2003
  • Recently, the machine tools have been needed for high speed and accuracy to increase productivity. The most Important thing to get a more stabilized machine is to know the frequency response which has an effect on manufacture a lot. This problem should be considered seriously by many researchers. There are many application programs about FEM but Just using FEM program to get information of the object is not enough to put our confidence in the stability of the machine tool design. Therefore, the purpose of this research is to make a study for proving one of the ways to design to produce stabilized a machine more efficiently by comparing FRT method and FEM. At these two tests, we can learn about the frequency response area causing resonance and we can reconfirm the result to trust.

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The Effect of Repurchase Intention on Baker Shop Customer's Service Quality Satisfaction (베이커리 이용객의 서비스 품질 만족도가 재 구매에 미치는 영향)

  • Kim, Yong-Sik;Park, Sang-Jun
    • Culinary science and hospitality research
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    • v.11 no.3 s.26
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    • pp.40-55
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    • 2005
  • The purpose of this study was to understand the effect of customers' repurchase intention, extract important factors, systematically analyze them and suggest the direction of bakery industry through studying the customers' satisfaction with bakeries. The researcher modified the questionnaire developed by Park, CH(1998), Lee, JH(2000), Yoon, YC(2000), and Kim SE(2002). In order to assess the level of customers' satisfaction with bakeries, a five point Likert scale was used. The used statistical methods for the data analysis were frequency analysis, reliability analysis, t-test factor analysis, ANOVA, multiple regression analysis. For all analyses of the research question, an alpha level of.05 was used. The major findings obtained from this study were as fellows. First on the factors of reliability and service ability, there was a high difference between males and females, and singles and the married. Second, on the factors of accessibility using convenience, service ability, and service response, there was a high difference among using frequence. Third, on the reliability factors, there was a high difference among average using amount per month. Forth, on the factors of accessibility using convenience, and service response, there was a high difference among types of customers' residing styles. Fifth, on the factors of income level, there was statistically no difference. Lastly, on the factors of accessibility using convenience, tangibleness, and service response, these factors significantly influenced customers' repurchase intention.

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Spectral Analysis of Heart Rate Variability in ECG and Pulse-wave using autoregressive model (AR모델을 이용한 심전도와 맥파의 심박변동 스펙트럼 해석)

  • Kim NagHwan;Lee EunSil;Min HongKi;Lee EungHyuk;Hong SeungHong
    • Journal of the Institute of Convergence Signal Processing
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    • v.1 no.1
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    • pp.15-22
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    • 2000
  • The analysis of power spectrum based on linear AR model is applied widely to quantize the response of autonomic nerve noninvasively, In this paper, we estimate the power spectrum density for heartrate variability of the electrocadiogram and pulse wave for short term data(less than two minute), The time series of heart rate variability is obtained from the time interval(RRI, PPI) between the feature point of the electrocadiogram and pulse wave for normal person, The generated time series reconstructed into new time series through polynomial interpolation to apply to the AR mode. The power spectrum density for AR model is calculated by Burg algorithm, After applying AR model, the power spectrum density for heart rate variability of the electrocadiogram and the pulse wave is shown smooth spectrum power at the region of low frequence and high frequence, and that the power spectrum density of electrocadiogram and pulse wave has similar form for same subject.

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Noise Lowering for a Large Variable Speed Range Use Permanent Magnet Motor by Frequence Shift and Structural Response Evaluation of Electromagnetic Forces

  • Arata, Masanori;Takahashi, Norio;Fujita, Masafumi;Mochizuki, Motoyasu;Araki, Takashi;Hanai, Takashi
    • Journal of Power Electronics
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    • v.12 no.1
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    • pp.67-74
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    • 2012
  • According to electrical output up rating of a permanent magnet motor and request to operate for a large variable speed range, resonance between structural natural vibration and electromagnetic force inside the motor can take place and make noise. This paper describes the mechanism of a resonance between them and noise lowering procedure by frequency shift when they are applied to the reluctance torque largely employed new motor named Permanent magnet Reluctance Motor (PRM).

Frequence Response of ZnO-SAW Filter (ZnO-SAW 필터의 주파수 응답)

  • 김영진;남기홍;조상희;김기완
    • Journal of the Korean Vacuum Society
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    • v.4 no.4
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    • pp.413-416
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    • 1995
  • 고주파 마그네트론 스펏터링법을 이용하여 ZnO막을 제조하고 유리기판 위에 ZnO-SAW필터를 제작하였다. ZnO막의 제조 조건은 고주파 전력 150W, 기판온도 $200^{\circ}C$, 분위기압 5mTorr 및 O2/(Ar+O2)비 50%였다. 한편 IDT(Inter-digital transducer)전극은 전극 폭을 2.56mm, 전극 거리를 2,936mm, λ/8폭을 $8mu$m로 설계하였다. 제작된 ZnO-SAW필터의 주파수 응답을 측정하기 위해 소자는 mount(TO8)에 고정시켰다. ZnO SAW필터의 통과 대역(3 dB대역폭)은 345.2~44.8 MHz로 9.6MHz의 대역 폭을 나타내었으며 중심주 파수는 40 MHz를 나타내었다. 또한 삽입 손실은 39 dB, 통과 대역에서의 리플(ripple)은 $\pm$ 0.8 dB 및 rejection은 17 dB를 나타내었다.

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A Multivariable Control design using Quantitative Feedback Theory (QFT를 이용한 다변수시스템의 제어기 설계)

  • Choi, Yong-Hee;Jung, Jae-Yun;Park, Yong-Sik;Kim, Young-Chol
    • Proceedings of the KIEE Conference
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    • 1999.11c
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    • pp.475-478
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    • 1999
  • In this paper, we propose the robust performance design of multivariable systems within the framework of Quantitative Feedback Theory(QFT) using ICD. The ICD(Individual Channel Design) is a multivariable control method based on the classical frequence response. It is considered to apply feedforward controller for compensating the effect of interconnection between channels. Performance of the proposed method are demonstrated by simulations in appling gas turbine model.

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