• 제목/요약/키워드: State-Space

검색결과 3,303건 처리시간 0.042초

추계학적 모의발생기법을 이용한 월 유출 예측 (The Forecasting of Monthly Runoff using Stocastic Simulation Technique)

  • 안상진;이재경
    • 한국수자원학회논문집
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    • 제33권2호
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    • pp.159-167
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    • 2000
  • 본 연구는 낙동강수계인 위천 유역의 최하류 군위 지점에 대해 추계학적 모형인 Box-Jenkin의 승법 ARIMA 모형과 상태공간모형 이론적 토대로 하여 계절별 월 유출량을 모의하였다. 다변량 시계열 모형인 상태공간모형의 입력변수로 월 유효우량과 균등기간의 관측된 월 유출량을 사용하여 군위지점의 월 유출량을 예측한 결과 다변량 시계열 모형인 승법 ARIMA모형에 비하여 표준오차가 작게 나타났으므로, 유효우량과 유출량을 함께 이용하는 상태공간 모형을 이용하여 합리적인 유출량 예측이 가능하도록 하였다. 본 논문은 월 유출량 기록치 및 유효우량 자료를 분석하여 승법 ARIMA 모형 및 상태공간 모형에 적용하였으며, 상태공가 모형의 이론을 적용하여 VAR(P)의 P값을 구하기 위해 시차에 의한 AIC 값을 이용하였다. VARMA 모형은 정준상관계수를 이용한 상태공간 모형을 구하여 구축하였다. 따라서, 본 논문에서는 구축된 상태공간 모형을 사용하여 위천유역의 군위 지점에서 장·단기 유출량을 예측하여 수자원의 장·단기전략 수립에 도움을 주기 위함이다.

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독립적인 이중 출력을 갖는 DC-DC 컨버터의 해석 및 설계 (Analysis and Design of DC-DC Converter with Independent Dual Outputs)

  • 허태원;박지호;김형완;우정인
    • 전기학회논문지P
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    • 제54권4호
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    • pp.171-178
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    • 2005
  • The proposed dual-output DC-DC converter that bases on flyback converter can obtain two output voltage with non-isolated main-output and isolated sub-output at the same time using single-winding high frequency transformer. It can solve problems in multi-winding converter that use one main-switch, and also control quality of isolated sub-output voltage can be improved by additional sub-switch to the second. For analysis and design of the proposed converter system, converters are classified as operation mode from switching state and are become modeling by applying state space averaging method. Steady-state characteristics and dynamic characteristics are analyzed by DC component and perturbation component from state space averaging model. From experiment converter, validity of analysis and design for the propose converter system is confirm.

이동 로봇의 강인 행동 계획 방법 (A Robust Behavior Planning technique for Mobile Robots)

  • 이상형;이상훈;서일홍
    • 로봇학회논문지
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    • 제1권2호
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    • pp.107-116
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    • 2006
  • We propose a planning algorithm to automatically generate a robust behavior plan (RBP) with which mobile robots can achieve their task goal from any initial states under dynamically changing environments. For this, task description space (TDS) is formulated, where a redundant task configuration space and simulation model of physical space are employed. Successful task episodes are collected, where $A^*$ algorithm is employed. Interesting TDS state vectors are extracted, where occurrence frequency is used. Clusters of TDS state vectors are found by using state transition tuples and features of state transition tuples. From these operations, characteristics of successfully performed tasks by a simulator are abstracted and generalized. Then, a robust behavior plan is constructed as an ordered tree structure, where nodes of the tree are represented by attentive TDS state vector of each cluster. The validity of our method is tested by real robot's experimentation for a box-pushing-into-a-goal task.

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이산 시간 스위칭 다이나믹을 이용한 새로운 슬라이딩 모드 제어 시스템의 설계 및 안정도 해석 (Design of new sliding mode control system using discrete-time switching dynamics and its stability analysis)

  • 김동식;서호준;서삼준;박귀태
    • 대한전기학회논문지
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    • 제45권3호
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    • pp.407-414
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    • 1996
  • In this paper we consider the variable structure control for a class of discrete-time uncertain multivariable systems where the nominal system is linear. Discrete-time switching dynamics are introduced so that a new type of state trajectories called sliding mode may exist on the sliding surface by state feedback. The quantitative analysis for the matched uncertainties will show that every response of the system with the proposed switching dynamics is bounded within small neighborhoods of the state-space origin. Also, by the similarity transformation it will be shown that the eigenvalues of the closed-loop systems are composed of those of the subsystems which govern the range-space dynamics and null-space dynamics. It will be also shown that ideal sliding mode can be obtained in the absence of uncertainties due to one-step attraction to the sliding surface regardless of initial position of states. (author). 12 refs., 2 figs.

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RPE 방법을 이용한 다입출력 시스템의 상태공간 극배치 자기동조 제어기 설계 (Design of state space pole assignment self-tuning controller for MIMO systems using RPE method)

  • 강석종;전기준
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 1986년도 한국자동제어학술회의논문집; 한국과학기술대학, 충남; 17-18 Oct. 1986
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    • pp.90-94
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    • 1986
  • This paper describes expansion of the state space pole assignment self-tuning control of SISO systems with system noise and abservation noise to that of MIMO systems. Resursive Prediction Error method is used for both parameter and state estimation in the block controllable canonical form. This simplifies the state feedback law by eliminating the online computation of transformation matrix.

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REPRODUCING KERNEL KREIN SPACES

  • Yang, Mee-Hyea
    • Journal of applied mathematics & informatics
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    • 제8권2호
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    • pp.659-668
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    • 2001
  • Let S(z) be a power series with operator coefficients such that multiplication by S(z) is an everywhere defined transformation in the square summable power series C(z). In this paper we show that there exists a reproducing kernel Krein space which is state space of extended canonical linear system with transfer function S(z). Also we characterize the reproducing kernel function of the state space of a linear system.

냉간압연 다단 압연기의 롤 슬립 모델링 및 상태 관측기 설계 (Modeling and State Observer Design for Roll Slip in Cold Cluster Mills)

  • 강현석;홍완기;황이철
    • 대한기계학회논문집A
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    • 제36권12호
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    • pp.1543-1549
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    • 2012
  • 이 논문은 냉간 압연공정의 다단 압연기에서 각 롤 간의 슬립 현상에 대한 상태공간 모델을 도출하고, 이를 이용하여 롤 간 슬립 상태 관측기 설계에 관한 연구를 수행한다. 먼저 뉴튼의 운동법칙을 이용하여 각 롤들의 회전 운동 방정식을 1계 비선형 미분 방정식으로 기술한 후, 테일러 급수를 이용하여 임의의 동작점에서 상태공간 방정식으로 선형화한다. 다음에는 선형화된 상태공간 방정식에 기초하여 Gopinath 구성법으로 측정 가능한 구동 롤을 제외한 종동 롤의 회전 각속도를 추정하는 최소차원 상태 관측기를 설계한다. 마지막으로 컴퓨터 시뮬레이션을 통하여 상태 관측기로부터 추정된 각 롤 회전각속도와 슬립률의 유용성을 고찰한다.

Health monitoring of multistoreyed shear building using parametric state space modeling

  • Medhi, Manab;Dutta, Anjan;Deb, S.K.
    • Smart Structures and Systems
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    • 제4권1호
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    • pp.47-66
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    • 2008
  • The present work utilizes system identification technique for health monitoring of shear building, wherein Parametric State Space modeling has been adopted. The method requires input excitation to the structure and also output acceleration responses of both undamaged and damaged structure obtained from numerically simulated model. Modal parameters like eigen frequencies and eigen vectors have been extracted from the State Space model after introducing appropriate transformation. Least square technique has been utilized for the evaluation of the stiffness matrix after having obtained the modal matrix for the entire structure. Highly accurate values of stiffness of the structure could be evaluated corresponding to both the undamaged as well as damaged state of a structure, while considering noise in the simulated output response analogous to real time scenario. The damaged floor could also be located very conveniently and accurately by this adopted strategy. This method of damage detection can be applied in case of output acceleration responses recorded by sensors from the actual structure. Further, in case of even limited availability of sensors along the height of a multi-storeyed building, the methodology could yield very accurate information related to structural stiffness.