• 제목/요약/키워드: moving average method

검색결과 548건 처리시간 0.041초

Efficient Interference Control Technology for Vehicular Moving Networks

  • Oh, Sung-Min;Lee, Changhee;Lee, Jeong-Hwan;Park, Ae-Soon;Shin, Jae Sheung
    • ETRI Journal
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    • 제37권5호
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    • pp.867-876
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    • 2015
  • This paper proposes an efficient interference control scheme for vehicular moving networks. The features of the proposed scheme are as follows: radio resources are separated into two resource groups to avoid interference between the cellular and vehicle-to-vehicle (V2V) links; V2V links are able to share the same radio resources for an improvement in the resource efficiency; and vehicles can adaptively adjust their transmission power according to the interference among the V2V links (based on the distributed power control (DPC) scheme derived using the network utility maximization method). The DPC scheme, which is the main feature of the proposed scheme, can improve both the reliability and data rate of a V2V link. Simulation results show that the DPC scheme improves the average signal-to-interference-plus-noise ratio of V2V links by more than 4 dB, and the sum data rate of the V2V links by 15% and 137% compared with conventional schemes.

고속철도교량의 동적응답에 의한 충격계수 평가 (Evaluation of Impact Factor of High-Speed Railway Bridges from Dynamic Response under KTX Running)

  • 윤혜진;진원종;곽종원;황의승;김병석
    • 한국철도학회:학술대회논문집
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    • 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
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    • pp.1636-1640
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    • 2011
  • To consider dynamic magnification effect at the static design stage, impact factor is applied to design load. Current impact factor adopted EUROCODE without domestic verification through theoretical and experimental studies. This study evaluated impact factor of railway bridges from dynamic response under KTX running. Moving Average Method was applied to calculate impact factor. Investigation considering different type of bridges and tracks including velocity was conducted.

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수요반응 프로그램 평가를 위한 CBL 추정 방법 (Estimating method of Customer Baseline Load for an Evaluation of Demand Response Program)

  • 위영민;김지희;주성관
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2009년도 제40회 하계학술대회
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    • pp.551_552
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    • 2009
  • 본 논문에서는 수요반응 프로그램 설계 시 프로그램의 효과를 평가할 때 사용되는 CBL (Customer Baseline Load)의 추정방법으로 일기보정을 고려한 가중이동평균법 (Weighted Moving Average)을 제시하였다. 또한 제안된 방법을 PJM에서 관리하는 지역 전력 수요 데이터를 이용한 사례연구 수행 결과를 예시하였다.

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패킷 손실을 고려한 네트워크 제어 시스템의 안정성 분석 (Stability Analysis of Networked Control Systems with Packet Dropouts)

  • 김재만;박진배;최윤호
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2009년도 제40회 하계학술대회
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    • pp.1731_1732
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    • 2009
  • This paper presents a stability analysis of networked control systems with packet dropouts. The packet dropouts are modeled as a linear function of the stochastic variable satisfying Bernoulli random binary distribution and weighted moving average (WMA). The observer based controller scheme is designed to exponentially mean square stabilize the NCS. Simulation results is provided to show the applicability of the proposed method.

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잡음 ARMA 프로세스의 적응 매개변수추정 (Adaptive Parameter Estimation for Noisy ARMA Process)

  • 김석주;이기철;박종근
    • 대한전기학회논문지
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    • 제39권4호
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    • pp.380-385
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    • 1990
  • This Paper presents a general algorithm for the parameter estimation of an antoregressive moving average process observed in additive white noise. The algorithm is based on the Gauss-Newton recursive prediction error method. For the parameter estimation, the output measurement is modelled as an innovation process using the spectral factorization, so that noise free RPE ARMA estimation can be used. Using apriori known properties leads to algorithm with smaller computation and better accuracy be the parsimony principle. Computer simulation examples show the effectiveness of the proposed algorithm.

ARMA 모델을 이용한 적응 모델예측제어에 관한 연구 (Adaptive model predictive control using ARMA models)

  • 이종구;김석준;박선원
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 1993년도 한국자동제어학술회의논문집(국내학술편); Seoul National University, Seoul; 20-22 Oct. 1993
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    • pp.754-759
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    • 1993
  • An adaptive model predictive control (AMPC) strategy using auto-regression moving-average (ARMA) models is presented. The characteristic features of this methodology are the small computer memory requirement, high computational speed, robustness, and easy handling of nonlinear and time varying MIMO systems. Since the process dynamic behaviors are expressed by ARMA models, the model parameter adaptation is simple and fast to converge. The recursive least square (RLS) method with exponential forgetting is used to trace the process model parameters assuming the process is slowly time varying. The control performance of the AMPC is verified by both comparative simulation and experimental studies on distillation column control.

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LSP 벡터 양자화의 성능 분석과 성능이 향상된 새로운 LSP 벡터 양자화 방법 (Performance Analysis of LSP Vector Quantization and New Improved LSP Vector Quantization Method)

  • 박호종
    • 한국음향학회지
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    • 제17권3호
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    • pp.59-64
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    • 1998
  • 본 논문에서는 LSP 벡터 양자화의 성능에 대하여 분석하고 성능이 향상된 새로운 LSP 벡터 양자화 방법을 제안한다. 먼저, 10msec프레임 구조를 가지고 Moving Average 예측 필터를 사용한 LSP Split 벡터 양자화의 성능을 여러 훈련 방법과 벡터 Split 방법 및 Bit 할당 방법에 따라 비교한다. 다음, Split 벡터 양자화의 문제점을 해결하기 위하여 새로 운 Split 벡터 양자화 검색 방법을 제안한다. 스펙트럼 왜곡지수를 이용한 양자화 성능 측정 결과 새로 제안된 방법이 기존의 방법보다 우수한 양자화 성능을 보인다.

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객체기반 부호화에서 혼합형 부호화방식을 이용한 MF(Model Failure) 객체의 색신호 부호화 (Color coding of MF(model failure) object using hybrid coding method in object based coding)

  • 김동하;이지훈;고성제;이태원
    • 전자공학회논문지S
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    • 제34S권5호
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    • pp.45-51
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    • 1997
  • To trnsmit moving image signals by using an object vased coding technique at the rate of 8kbps~11kbps, it is very important to minimize the bit rates used for the compression of the color information of MF-objects. This paper proposes a hybrid coding method which uses the shpae adaptive coding method and the interframe reference method selectively. Gilge's shape adaptive orthogonal coidng method is utilized for shpae adaptive coding. The interfarame reference method approximates the low-passed signals of the image by gilge's shpae adaptive orthogonalization method and then refers the approximation error signals from the high frequency signal components of th eprevious frame. The proposed method achives the bit rates reduction of 17% compared to the gilge's shape adaptive orthogonalization method and 30% rduction compared to the shape adaptive DCT in average.

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스키마 공진화 기법을 이용한 자율이동로봇의 행동제어 (Behavior Control of Autonomous Mobile Robot using Schema Co-evolution)

  • Sun, Joung-Chi;Byung, Jun-Hyo;Bo, Sim-Kwee
    • 한국지능시스템학회:학술대회논문집
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    • 한국퍼지및지능시스템학회 1998년도 춘계학술대회 학술발표 논문집
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    • pp.123-126
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    • 1998
  • The theoretical foundations of GA are the Schema Theorem and the Building Block Hypothesis. In the Meaning of these foundational concepts, simple genetic algorithm(SGA) allocate more trials to the schemata whose average fitness remains above average. Although SGA does well in many applications as an optimization method, still it does not guarantee the convergence of a global optimum. Therefore as an alternative scheme, there is a growing interest in a co-evolutionary system, where two populations constantly interact and co-evolve in contrast with traditional single population evolutionary algorithms. In this paper, we propose a new design method of an optimal fuzzy logic controller using co-evolutionary concept. In general, it is very difficult to find optimal fuzzy rules by experience when the input and/or output variables are going to increase. So we propose a co-evolutionary method finding optimal fuzzy rules. Our algorithm is that after constructing two population groups m de up of rule vase and its schema, by co-evolving these two populations, we find optimal fuzzy logic controller. By applying the proposed method to a path planning problem of autonomous mobile robots when moving objects exist, we show the validity of the proposed method.

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20세기 우리나라 관측최대강수량의 특성 (Maximum Areal Rainfall of Korea in the 20th Century)

  • 김남원;원유승
    • 한국수자원학회논문집
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    • 제37권5호
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    • pp.425-435
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    • 2004
  • 수자원분야에서 관측최대강수량은 주로 지점최대 강수량에 의해 평가되어 왔으나, 엄밀한 의미에서 강수량이라 함은 면적평균강수량으로 고려되어야 한다. 면적평균강수량은 관측호우의 DAD(rainfall Depth-Area-Duration) 분석을 통하여 계산된 추정치이고, 이로부터 대상면적-지속기간별 면적평균강수량 또는 최대관측강수량을 산정할 수 있다. 본 연구에서는 우리나라 전역을 수문학적으로 동질하다고 가정하여 호우중심의 DAD 분석을 수행하였으며, 이로부터 면적-지속기간별 최대관측강수량의 연도별 변화를 고찰하였다. 또한, 면적-지속기간별고 구성된 시계열로부터 확률강수량을 산정하여, 면적별 IDF와 관측치대강수량의 특성에 대하여 논하였다.