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Semi-local extraction of ring structures in images of biological hard tissues: application to the Bayesian interpretation of fish otoliths for age and growth estimation ArchiMer
Fablet, Ronan.
This paper deals with the analysis of images of biological tissue that involves ring structures, such as tree trunks, bivalve seashells, or fish otoliths, with a view to automating the acquisition of age and growth data. A bottom-up template-based scheme extracts meaningful ridge and valley curve data using growth-adapted time-frequency filtering. Age and growth estimation is then stated as the Bayesian selection of a subset of ring curves, which combines a measure of curve significativity and an a priori statistical growth model. Experiments on real samples demonstrate the efficiency of the proposed data extraction stage. Our Bayesian framework is shown to significantly outperform previous methods for the interpretation of a data set of 200 plaice...
Tipo: Text Palavras-chave: Bayesian modeling; Automated age and growth estimation; Growth ring extraction; Otolith images; Images of biological hard tissues; Approche bayésienne; Estimation automatiques de l'âge et de la croissance; Extraction automatiques des marques de croissance; Otolithe; Tissus durs.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-1705.pdf
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Statistical Analysis of the Dynamic Structure of China's Economic Sectors Based on Bayesian Modeling OAK
Noda, Hideo; Kyo, Koki; 野田, 英雄; 姜, 興起.
This paper aims to develop an alternative production function-based approach for analyzing economic fluctuations at the sectoral level, by applying Bayesian techniques. To estimate total factor productivity (TFP) and elasticities of output with respect to factors of production, we incorporate smoothness priors into statistical models based on sectoral production functions. In addition, we consider that TFP generally varies smoothly; however in some situations there may be abrupt changes. Therefore, to relieve difficulties resulting from abrupt changes in TFP, a new method, termed the random grouping method, is introduced. Compared with the conventional production function approach, a main advantage of our proposed methods is to make detailed analysis of...
Palavras-chave: Bayesian modeling; Sectoral TFP; Smoothness priors; Random grouping method; Chinese economy.
Ano: 2010 URL: http://ir.obihiro.ac.jp/dspace/handle/10322/3126
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Scientific instruments for climate change adaptation: estimating and optimizing the efficiency of ecosystem service provision AgEcon
Villa, Ferdinando; Bagstad, Kenneth J.; Johnson, Gary W.; Voigt, Brian.
Adaptation to the consequences of climate change can depend on efficient use of ecosystem services (ES), i.e. a better use of natural services through management of the way in which they are delivered to society. While much discussion focuses on reducing consumption and increasing production of services, a lack of scientific instruments has so far prevented other mechanisms to improve ecosystem services efficiency from being addressed systematically as an adaptation strategy. This paper describes new methodologies for assessing ecosystem services and quantifying their values to humans, highlighting the role of ecosystem service flow analysis in optimizing the efficiency of ES provision.
Tipo: Journal Article Palavras-chave: Ecosystem services; Flow analysis; Bayesian modeling; Spatial analysis; Environmental Economics and Policy; Q01; Q54; Q55; Q57.
Ano: 2011 URL: http://purl.umn.edu/117618
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