• Title/Summary/Keyword: delay effect

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A Study on the improvement of reverberation characteristics using tapped and nested-allpass delay line (Tapped and nested-allpass delay line을 이용한 잔향특성 개선에 관한 연구)

  • Yoon, Jae-Yeun;Park, Jun-Sun;Jin, Yong-Ok
    • Journal of Broadcast Engineering
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    • v.12 no.1 s.34
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    • pp.28-40
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    • 2007
  • In this paper, we proposes an idea for improved sound characteristic which decreasing a problem in previous reverberation algorism structure. To later reflection sound, proposed new reverberation structure, using a lopped and nested all-pass delay line, and it is designed to improve an natural concert hall sound. In addition, In order to have best imaginary sound effect, we extracted the factors by controlling each delay line's delay time, and we realized a proposed new algorithm by using general-purpose DSP. Through several experimental cases, we observed better effect on improvement of linear flatten and reverberation density and decreasing about colorlessness and non-linear sound at previous proposed model about impulse input.

Effect of Outdated Channel Estimates on Multiple Antennas Multiple Relaying Networks

  • Wang, Lei;Cai, Yueming;Yang, Weiwei;Yan, Wei;Song, Jialei
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.9 no.5
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    • pp.1682-1701
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    • 2015
  • In this paper, we propose an intergraded unified imperfect CSI model and investigate the joined effects of feedback delay and channel estimation errors (CEE) for two-hop relaying systems with transmit beamforming and relay selection. We derived closed-form expressions for important performance measures including the exact analysis and lower bounds of outage probability as well as error performance. The ergodic capacity is also included with closed-form results. Furthermore, diversity and coding gains based on the asymptotic analysis at high SNRs are also presented, which are simple and concise and provide new analytical insights into the corresponding power allocation scheme. The analysis indicates that delay effect results in the coding gain loss and the diversity order loss, while CEE will merely cause the coding gain loss. Numerical results verify the theoretical analysis and illustrate the system is more sensitive to transmit beamforming delay compared with relay selection delay and also verify the superiority of optimum power allocation. We further investigate the outage loss due to the CEE and feedback delays, which indicates that the effect of the CEE is more influential at low-to-medium SNR, and then it will hand over the dominate role to the feedback delay.

Robust Trajectory Control of Robot Manipulators Using Time Delay Estimation and Internal Model Concept (로봇 매니퓰레이터를 위한 시간지연추정과 내부모델개념을 결합한 강인제어기에 관한 연구)

  • Cho Geon Rae;Chang Pyung-Hun;Jung Je Hyung
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.28 no.8 s.227
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    • pp.1075-1086
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    • 2004
  • In this paper, Time Delay Control(TDC) for robot manipulators is analyzed and its problems are founded. In order to remedy the problems, the enhanced controller is proposed and analyzed. The effect of friction associated with TDC is reported and its cause is presented. Through the analysis, simulation and experiment, it is shown that the friction effect causes serious degradation in control performance and that it is a result of the error of Time Delay Estimation(TDE) in TDC. In order to remedy the problems, TDC combined with Internal Model Control(IMC) concept is proposed. The proposed compensator is effective enough to handle the bad effect of friction, and is so simple and efficient as to match positive attribute of TDC. The simulation and experimental results show the effectiveness of proposed controller against the friction of the robot manipulators.

The Effect of the Baduk Play Activity Upon a Child's Intelligence, Problem-solving and Delay of Gratification (바둑놀이활동이 유아의 인지능력, 문제해결력 및 만족지연능력에 미치는 효과)

  • Kim, Ba-Ro-Mi;Cho, Bok-Hee
    • Korean Journal of Human Ecology
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    • v.19 no.2
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    • pp.245-256
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    • 2010
  • The purpose of this study is on the effect of the Baduk play activity upon a child's intelligence, problem solving and delay of gratification. 68 participants (36 from the test group and 32 from the regulation group) were selected from 5 year old children who attend two elementary school annexed kindergartens for a pre-test and post-test in order to verify the effect of the Baduk play activity. The Baduk play activity was applied to the test group 3 times a week from the 3rd week of March, 2008 until the 3rd week of October, 2008. In this study, K-WPPSI, CPS and delay of gratification test were used to measure the effect of the activity. As a result, it can be construed that the Baduk play activity gives children a more positive influence upon their activity and overall IQ, ability of problem- solving and delay of gratification.

A Study on the Traffic Effect Zone and Application of Road Occupying Construction (도로 공사중의 교통영향권역 설정 및 적용성에 관한 연구)

  • Lee, Ju-Ho;Lee, Young-Woo;Lim, Chae-Moon
    • Journal of the Korean Society of Industry Convergence
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    • v.6 no.2
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    • pp.131-139
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    • 2003
  • The links operating interrupted flow are intend to yield the traffic between the out flow and inflow part effect zone of street section, we build the delay model using the time gap between under construction and not. We review the applicability of interrupted flow, and thus we can put this data to practical use as the basis data to compute the inducement charge for traffic delay. Also building about traffic effect zone of interrupted flow wouldn't produce at the section beside occupying roads and construction cross section, thus we must review the plan to minimize traffic delay by the construction occupying road. In future there must be advanced the incomplete in this study, and groping for the various alternatives to minimize the traffic delay by the road occupying construction, with developing the various sets of detailed analyzing models, that is analysis on the street strength, crossroads geometrical forms of crossroads, public traffics, pedestrians, occupying types.

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A Case Study on Reason Analysis for Schedule Delay of Apartment House (공동주택의 공기지연 원인분석 사레 연구)

  • Park, Chang-Wook;Yun, Seok-Heon
    • Journal of the Korea Institute of Building Construction
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    • v.9 no.1
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    • pp.89-94
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    • 2009
  • A study was performed the analysis for the schedule delay of the public housing. To perform this study, the first study existing research literature on the cause of the schedule delay was considered. The based on existing study, this study selected the cause of schedule delay. For check of the schedule delay, this study was compared the monthly schedule and the work diary. Survey was conducted for using the selected cause of schedule delay. And the importance was calculated for using the AHP method. In a case site, the cause of the schedule delay was analyzed. The last, the delay cause was presented the map of cause of effect the based on the delay cause of a case site.

Analysis of Response Characteristics of the CAN-Based Feedback Control System Considering the Network Delay Time

  • Jeon, Jong-Man;Kim, Dae-Won
    • 제어로봇시스템학회:학술대회논문집
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    • 2001.10a
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    • pp.119.3-119
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    • 2001
  • When building a network-based real-time control system, a network-induced delay time should be surly considered for real time schedulability to be guaranteed. The network delay time on end-to-end communication has been analyzed theoretically and modeled mathematically from many previous works. There also exist any other delay element not considered before. In this paper, the remote feedback control system using the CAN protocol is proposed to control three axes´ manipulator arm and the application layer of CAN is modeled to analyze the delay elements defined by three types of time delay: Software delay time, Controller delay time, and Access delay time, in details. The analyzed results are used as an important component to determine PID gains of the proposed system. The effect of the delay time on the control performance is evaluated by com paring the response characteristics of the control system through simulation.

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Extraction of Optimal Time-Delay in Adaptive Command Shaping Filter for Flexible Manipulator Control (유연한 매니퓰레이터 제어를 위한 적응형 명령성형 필터의 최적 시간지연 값 추출)

  • Park, Joo-Han;Rhim, Sung-Soo
    • Journal of Institute of Control, Robotics and Systems
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    • v.14 no.6
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    • pp.564-572
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    • 2008
  • The performance of the direct adaptive time-delay command shaping filter depends on the select time-delay. In the previously introduced direct adaptive command shaping filter, however, the time-delay value is fixed and only the magnitudes of the impulses are learned. In this paper, the authors introduce a new scheme to adapt the time-delay which is to be used in conjunction with the direct adaptive command shaping for the improved vibration suppression in flexible motion system. In order to formulate the time-delay adaptation scheme, the authors have analyzed the effect of the time-delay value on the performance of the direct adaptive command shaping filter. By modifying the direct adaptation formula based on the analysis result the authors have established a set of equations to adapt the time-delay toward the optimal value. Simulation results show the effectiveness of the proposed time-delay adaptation approach for the improved vibration suppression.

A study on the impedance effect of nonvolatile memory devices (비휘발성 기억소자의 저항효과에 관한 연구)

  • 강창수
    • Electrical & Electronic Materials
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    • v.8 no.5
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    • pp.626-632
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    • 1995
  • In this paper, The effect of the impedances in SNOSFET's memory devices has been developed. The effect of source and drain impedances measured by means of two bias resistances - field effect bias resistance by inner region, external bias resistance. The effect of the impedances by source and drain resistance shows the dependence of the function of voltages applied to the gate. It shows the differences of change in source drain voltage by means of low conductance state and high conductance state. It shows the delay of threshold voltages. The delay time of low conductance state and high conductance state by the impedances effect shows 3[.mu.sec] and 1[.mu.sec] respectively.

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Effects of Flame Transfer Function on Modeling Results of Combustion Instabilities in a 3 Step Duct System (3단 덕트 시스템에서 화염전달함수가 연소불안정 모델링 결과에 미치는 영향)

  • Hong, Sumin;Kim, Daesik
    • Journal of ILASS-Korea
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    • v.25 no.3
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    • pp.119-125
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    • 2020
  • In this paper, we used Helmholtz solver based on 3D finite element method to quantitatively analyze the effects of change of gain, time delay and time delay spread, which are the main variables of flame transfer function, on combustion instability in gas turbine combustor. The effects of the variable of flame transfer function on the frequency and growth rate, which are the main results of combustion instability, were analyzed by applying the conventional heat release fluctuation model and modified one considering the time spread. The analysis results showed that the change of gain and time delay in the same resonance mode affected the frequency of the given resonance modes as well as growth rate of the feedback instability, however, the effect of time delay spread was not relatively remarkable, compared with the dominant effect of time delay.