Search results for "Estimation"

Input-Output Feedback Linearization Control with On-Line Inductances Estimation of Synchronous Reluctance Motors

2021

This paper proposes an adaptive input-output Feedback Linearization (FL) techniques for Synchronous Reluctance Motor (SynRM) drives, taking into consideration the iron losses. As a main original content, this work proposes a control law based on a new dynamic model of the SynRM including iron losses as well as the on-line estimation of the static inductances. The on-line estimation of the SynRM static inductances permits to inherently take into consideration the magnetic saturation phenomena occuring on both axes. The estimation law is obtained thanks to a Lyapunov-based analysis and thus the stability of the entire control system, including the estimation algorithm, is intrinsically guaran…

Low-complexity AoA and AoD estimation in the transformed spatial domain for millimeter wave MIMO channels

2021

La estimación del ángulo de llegada (AoA) y del ángulo de salida (AoD) es fundamental para la búsqueda de celdas, las comunicaciones estables y el posicionamiento en los sistemas celulares de ondas milimétricas (mmWave). Además, el diseño de algoritmos de estimación de AoA/AoD de baja complejidad resulta también de gran importancia en el despliegue de sistemas prácticos para permitir un cálculo rápido y eficiente de la conformación de haz. La estimación paramétrica del canal en ondas milimétricas permite describir la matriz del canal como una combinación de trayectorias de señales dependientes de la dirección, explotando la característica de dispersión de los canales mmWave. En este context…

Quantifying uncertainty in high resolution biophysical variable retrieval with machine learning

2022

The estimation of biophysical variables is at the core of remote sensing science, allowing a close monitoring of crops and forests. Deriving temporally resolved and spatially explicit maps of parameters of interest has been the subject of intense research. However, deriving products from optical sensors is typically hampered by cloud contamination and the trade-off between spatial and temporal resolutions. In this work we rely on the HIghly Scalable Temporal Adaptive Reflectance Fusion Model (HISTARFM) algorithm to generate long gap-free time series of Landsat surface reflectance data by fusing MODIS and Landsat reflectances. An artificial neural network is trained on PROSAIL inversion to p…

Unemployment dynamics and NAIRU estimates for accession countries: A univariate approach

2005

Abstract In this paper we test for hysteresis effects versus the natural rate hypothesis on unemployment rates of new members in the European Union (EU) using unit root tests that account for the presence of level shifts. In addition, we estimate the non-accelerating inflation rate of unemployment (NAIRU) from a univariate perspective. The precision of these NAIRU are investigated by studying two sources of inaccuracy that derive from the estimation of the break points, and the estimation of the autoregressive parameters. The results indicate up to four structural breaks in the NAIRU of transition countries that can be associated with institutional changes from implementing market-oriented …

The effects of wage flexibility on activity and employment in Spain

2018

Abstract In this paper we estimate the macroeconomic effects of the greater wage and firms’ internal flexibility promoted by the economic policies implemented since 2012, which changed markedly Spanish labour regulations. To do so, we propose a structural VAR that allows us to break down changes in main macroeconomic variables into different structural shocks. From a policy perspective, the estimation of the structural shocks allows us to simulate a counterfactual scenario, whereby we conclude that the effects of less rigid labour market are positive and significant. Our results suggest that, if these policies were implemented at the beginning of the crisis, they could have avoided a signif…

Testing for Financial Contagion Between Developed and Emerging Markets During the 1997 East Asian Crisis

2003

In this paper we examine whether during the 1997 East Asian crisis there was any contagion from the four largest economies in the region (Thailand, Indonesia, Korea and Malaysia) to a number of developed countries (Japan, UK, Germany and France). Following Forbes and Rigobon (2002), we test for contagion as a significant positive shift in the correlation between asset returns, taking into account heteroscedasticity and endogeneity bias. Furthermore, we improve on earlier empirical studies by carrying out a full sample test of the stability of the system that relies on more plausible (over)identifying restrictions. The estimation results provide some evidence of contagion, in particular from…

Intertemporal and interprovincial variations in income inequality: Spain, 1973–1991

2002

Goerlich F. J. and Mas M. (2002) Intertemporal and interprovincial variations in income inequality: Spain, 1973–1991, Reg. Studies 36, 1005–1015. The paper presents the main findings on personal income distribution for the Spanish provinces over the period 1973–91. The information comes from the three structural Household Budget Surveys and has been elaborated by the authors on a homogeneous base (available at: http://www.ivie.es). It starts by reviewing the information provided by some dispersion statistics, including kernel density functions, applied to the provincial Gini indices and Lorenz percentiles. It goes on to test, making use of an ANOVA model, two propositions related with inter…

Modelling and Identification of Mg(OH)2 precipitation kinetics from highly concentrated Mg2+ solutions

Identification of Mg(OH)2 precipitation kinetics with population balances and CFD

Estimation of Short Temporal Intervals in Alzheimer's Disease

2000

This study investigated the estimation of short temporal intervals in Alzheimer's disease (AD). Eight patients with dementia of the Alzheimer type, and eight age-matched controls were evaluated in a time-estimation task. The task consisted in the production of three short empty intervals (5, 10, and 25 s). Results indicated that AD patients show deficits both in the accuracy and precision of time judgments: in the three intervals evaluated, the magnitude of absolute error and the variability in time judgments were significantly greater in AD patients than healthy respondents (p < .01). These findings are discussed taking into account the contribution of attentional processes during the perf…