• 제목/요약/키워드: Coefficient estimate

검색결과 1,426건 처리시간 0.028초

다수의 미지 가상 입력 계수들을 가지는 비선형 시스템에 대한 적응 안정화 (Adaptive stabilization for nonlinear systems with multiple unknown virtual control coefficients)

  • 서상보;정진우;서진헌;심형보
    • 대한전자공학회:학술대회논문집
    • /
    • 대한전자공학회 2009년도 정보 및 제어 심포지움 논문집
    • /
    • pp.76-78
    • /
    • 2009
  • This paper considers the problem of global adaptive regulation for a class of nonlinear systems which have multiple unknown virtual control coefficient. By using a new parameter estimator and backstepping technique, we design a smooth state feedback control law, parameter update laws that estimate the unknown virtual control coefficients, and a continuously differentiable Lyapunov function which is positive definite and proper.

  • PDF

인삼 주요형질의 변이계수 (Coefficient of Variability of Agronomic Characters in Panax ginseng C.A. Meyer)

  • 안상득;최광태
    • Journal of Ginseng Research
    • /
    • 제9권1호
    • /
    • pp.9-14
    • /
    • 1985
  • The aerial parts, stem diameter, stem length, Petiole length, leaf length and leaf width were investigated to estimate coefficient of variability in ginseng at 2 to 4 years grown under the conventional and improved shadings. C.V values of characters such as stem length, petiole length, leaf length and leaf width were decreased with increasing the plant age, while that of steam diameter was increased. C.V. values of aerial part characters were higher in conventional shading than in improved shading, and the variance of c.v. was not significant when above 20 plants were investigated.

  • PDF

유압식 마찰시험기의 성능 평가에 관한 실험적 비교 연구 (An experimental comparison study on performance evaluation for hydraulic pin-on-disk type tribotester)

  • 서만식;이상욱;구영필;조용주
    • 한국윤활학회:학술대회논문집
    • /
    • 한국윤활학회 1998년도 제28회 추계학술대회
    • /
    • pp.285-291
    • /
    • 1998
  • A hydraulic pin-on-disk type tribotester was developed and it's performance was investigated experimentally. The estimate of the performance was accomplished by comparing those of the pneumatic and the dead-weight loading method. The reliability to the performance was conformed. By hydraulic loading method more accra'ate friction coefficient could be got.

  • PDF

FINITE ELEMENT SCHEME FOR THE VISCOUS CAHN-HILLIARD EQUATION WITH A NONCONSTANT GRADIENT ENERGY COEFFICIENT

  • CHOO S. M.;KIM Y. H.
    • Journal of applied mathematics & informatics
    • /
    • 제19권1_2호
    • /
    • pp.385-395
    • /
    • 2005
  • A finite element scheme is considered for the viscous Cahn-Hilliard equation with the nonconstant gradient energy coefficient. The scheme inherits energy decay property and mass conservation as for the classical solution. We obtain the corresponding error estimate using the extended Lax-Richtmyer equivalence theorem.

원 파형과 임의 반복시킨 파형의 비교에 의한 유성음의 피치검출 (The Pitch Extraction of Voiced Speech by the Comparison Between the Original and the Repeated Segmental Waveform.)

  • 배명진;안수길
    • 대한전기학회:학술대회논문집
    • /
    • 대한전기학회 1988년도 전기.전자공학 학술대회 논문집
    • /
    • pp.39-42
    • /
    • 1988
  • In speech signal processing, it is necessary to estimate exactly the pitch. We propose a new algorithm which uses the correlation coefficient between the original and the repeated segmental waveform in the frame as a parameter in the pitch extraction. The correlation coefficient in the frame reflects the periodic component and the transient ratio of the waveform.

  • PDF

적분 슬라이딩 모드 제어기를 이용한 출력 궤환 안정화 (Output Feedback Stabilization using Integral Sliding Mode Control)

  • 오승록
    • 대한전기학회논문지:시스템및제어부문D
    • /
    • 제52권3호
    • /
    • pp.142-147
    • /
    • 2003
  • We consider a single-input-single-output nonlinear system which can be represented in a normal form. The nonlinear system has a modeling uncertainties including the input coefficient uncertainty. A high-gain observer is used to estimate the states variables to reject a modeling uncertainty. A globally bounded output feedback integral sliding mode control is proposed to stabilize the closed loop system. The proposed integral sliding mode control can asymptotically stabilize the closed loop system in the presence of input coefficient uncertainty.

몬테카를로법을 이용한 비선형 확률계수모형의 추정 (Estimation Using Monte Carlo Methods in Nonlinear Random Coefficient Models)

  • 김성연
    • 한국시뮬레이션학회논문지
    • /
    • 제10권3호
    • /
    • pp.31-46
    • /
    • 2001
  • Repeated measurements on units under different conditions are common in biological and biomedical studies. In a number of growth and pharmacokinetic studies, the relationship between the response and the covariates is assumed to be nonlinear in some unknown parameters and the form remains the same for all units. Nonlinear random coefficient models are used to analyze such repeated measurement data. Extended least squares methods are proposed in the literature for estimating the parameters of the model. However, neither objective function has closed form expression in practice. This paper proposes Monte Carlo methods to estimate the objective functions and the corresponding estimators. A simulation study that compare various methods is included.

  • PDF

CONVOLUTION PROPERTIES FOR ANALYTIC FUNCTIONS DEFINED BY q-DIFFERENCE OPERATOR

  • Cetinkaya, Asena;Sen, Arzu Yemisci;Polatoglu, Yasar
    • 호남수학학술지
    • /
    • 제40권4호
    • /
    • pp.681-689
    • /
    • 2018
  • In this paper, we defined new subclasses of Spirallike and Robertson functions by using concept of q-derivative operator. We investigate convolution properties and coefficient estimates for both classes q-Spirallike and q-Robertson functions denoted by ${\mathcal{S}}^{\lambda}_q[A,\;B]$ and ${\mathcal{C}}^{\lambda}_q[A,\;B]$, respectively.

딜라토메터 소산시험 해석에 대한 고찰 및 새로운 해석법 (An Investigation of Dissipation Analysis for Dilatometer & New Interpretation Method)

  • 김영상
    • 한국지반공학회:학술대회논문집
    • /
    • 한국지반공학회 2003년도 봄 학술발표회 논문집
    • /
    • pp.365-368
    • /
    • 2003
  • Despite of the simple equipment and operation, DMT has been widely used to obtain various soil parameters and those parameters have been successfully applied to geotechnical design practice. Among them, the estimation of horizontal coefficient of consolidation is so useful that many researchs recently have been carried out. However, simulation of the penetration of the DMT blade is complex due to the inherent difficulty on analyzing a plane strain deformation of the soil around blade. Therefore, empirical and semi-empirical methods that use the theoretical solution developed fur piezocone with some assumptions have been used to estimate the coefficient of consolidation from Dilatometer dissipation test. In this paper, coefficients of consolidation c$\_$h/ which were obtained using equivalent radius that is same area with the DMT blade and optimization technique are compared with those obtained from Oedometer test and other interpretation methods. It was found that a new method used in this study can give more precise horizontal coefficient of consolidation than other methods do.

  • PDF

피에조콘 소산곡선을 이용한 연약지반의 압밀계수 산정 (Estimation of coefficient of consolidation in soft soils using PCPT dissipation results)

  • 서경범;조성환;이준환
    • 한국지반공학회:학술대회논문집
    • /
    • 한국지반공학회 2010년도 추계 학술발표회
    • /
    • pp.1015-1023
    • /
    • 2010
  • While various PCPT-based methods for the analysis of consolidation were developed, additional laboratory test is needed to estimate the coefficient of consolidation. In this paper, hyperbolic method using PCPT dissipation curve for the estimation of coefficient of consolidation was proposed. To verify proposed method, field settlement test data and PCPT dissipation test data at same site were collected and analyzed. It is observed that proposed method shows good agreement with measured field settlement data.

  • PDF