Search results for " Segmentation"
showing 10 items of 462 documents
Reassessing segmentation in the Labour Market: an application for Italy 1995-2004.
2011
The aim of this paper is to test for the presence of dualism in a standard wage regression. The disparity in wages between primary and secondary workers, according to labour market segmentation theory, is not provided by worker characteristics, but rather by job characteristics. A standard way to assess this situation is by looking at the estimated coefficients in a standard regression for comparable workers across different labour market segments. In an attempt to avoid arbitrary modelling choices, we deploy mixture regression methods which allow for endogenous determination of the number of existing labour market segments. Using Italian data, our modelling strategy outlines stark differen…
The Euro and European identity: The Spanish and Portuguese case
2001
Abstract The European Union proposes a potential social identity that Spain and Portugal wish to have as part and parcel of their process of modernisation and economic growth. The Euro is the symbol of this desire. As this study shows, in the process of changing to the new currency the pro-European attitudes are far more advanced than any real information citizens may have. As a result of this, the desire to be a European citizen is expressed in the new currency or any other symbol of identity that may strengthen this particular image. The support that citizens give to the Single European Currency comes more from the European identity than from the economic expectations or knowledge of the …
A Cointegration Analysis of Car Advertising and Sales Data in the Presence of Structural Change
2006
Abstract This paper examines whether there is a long‐run stable equilibrium relationship between advertising and sales across the market segments of the UK car industry over the period 1971–2001. In order to achieve this goal, we allow for structural breaks in the series using cointegration techniques. The results show the existence of long‐run equilibrium relationships in all six market segments, although in four of them the relationship is not stable. In general, one structural change is detected in the late 1970s and another in the early 1990s, coinciding with two economic recessions. When we do not account for structural changes, the estimated long‐run elasticities of advertising on sal…
Automatic Segmentation and Enhancement of Pavement Cracks Based on 3D Pavement Images
2019
Pavement cracking is a significant symptom of pavement deterioration and deficiency. Conventional manual inspections of road condition are gradually replaced by novel automated inspection systems. As a result, a great amount of pavement surface information is digitized by these systems with a high resolution. With pavement surface data, pavement cracks can be detected using crack detection algorithms. In this paper, a fully automated algorithm for segmenting and enhancing pavement crack is proposed, which consists of four major procedures. First, a preprocessing procedure is employed to remove spurious noise and rectify the original 3D pavement data. Second, crack saliency maps are segmente…
Au delà de la crise en France, la vulnérabilité des jeunes d'origine maghrébine
2015
International audience; L'objet de cet article est d'appréhender les conséquences de la crise financière de 2008 en comparant les trajectoires de deux cohortes de jeunes, observées sur un horizon temporel de sept ans, et en mobilisant la théorie de la segmentation du marché du travail. Que peut-on dire sur le devenir professionnel des jeunes femmes et jeunes hommes en termes de position sur le marché du travail (emploi, chômage), mais aussi en termes de qualité des postes occupés (contrat et durée de travail, salaire) ? Les nombreux changements d'emplois et retours au chômage soulignent des difficultés plus importantes pour les français d'origine maghrébine. Les problèmes que rencontre cett…
Revista de educación
1975
Cuando se habla de desigualdad de oportunidades en materia de educación puede aludirse a dos cosas: desigualdades ante la escuela y desigualdad a causa de la escuela. La primera es el resultado de múltiples causas, la mayor de las cuales no son económicas y ha permitido una aproximación entre diversas disciplinas. La segunda si son económicas o relacionadas con ellas. Pero viendo que las funciones que no incluían más que la educación como factor deteminante del nivel de beneficios no daban resultados claros cuando se trabajaba con datos individuales, los defensores de la teoría del capital humano han probado a introducir otras variables a su modelo inicial y son: edad;el sexo y la raza; la …
Approximation of Pore Space with Ellipsoids: A Comparison of a Geometrical Method with a Statistical one
2018
We work with tomographic images of pore space in soil. The images have large dimensions and so in order to speed-up biological simulations (as drainage or diffusion process in soil), we want to describe the pore space with a number of geometrical primitives significantly smaller than the number of voxels in pore space. In this paper, we use the curve skeleton of a volume to segment it into some regions. We describe the method to compute the curve skeleton and to segment it with a simple segment approximation. We approximate each obtained region with an ellipsoid. The set of final ellipsoids represents the geometry of pore space and will be used in future simulations. We compare this method …
Automatic research of the capitalization rate for the residential automated valuation: an experimental study in Cosenza (Italy).
2017
When a market oriented approach is not applicable because of the lack of comparable sales data (Ciuna et al. 2014a), International Valuation Standards suggest the use of the Income Approach, which has the task of simulating the market through an economic and financial scheme. The central question of this approach is due to the quantification of the capitalization rate, whereas it is generally extracted in a market segment different from that of the subject. This paper intends to propose an automated valuation model of the capitalization rate based on a real estate database built through a computerized geocoding automatic procedure, starting from the application of statistical models of mult…
Three dimensional reconstruction of intracoronary ultrasound images: roadmapping with simultaneously digitised coronary angiograms
2002
Three dimensional reconstruction of intracoronary ultrasound images offers a better appreciation of the axial relationship of vessel features and permits volumetric assessment, both of which depend critically on the spatial accuracy of the technique. This in turn is dependent on precise longitudinal orientation of the transducer in the vessel. The authors have developed a system which utilises simultaneously digitised fluoroscopic tracking of the radio-opaque transducer to orient the corresponding 2D ICUS images. This system may offer improved spatial accuracy of the three dimensional reconstruction and a means of precise identification of the 2D ICUS image which corresponds with a selected…
An open access database for the evaluation of heart sound algorithms
2016
In the past few decades, analysis of heart sound signals (i.e. the phonocardiogram or PCG), especially for automated heart sound segmentation and classification, has been widely studied and has been reported to have the potential value to detect pathology accurately in clinical applications. However, comparative analyses of algorithms in the literature have been hindered by the lack of high-quality, rigorously validated, and standardized open databases of heart sound recordings. This paper describes a public heart sound database, assembled for an international competition, the PhysioNet/Computing in Cardiology (CinC) Challenge 2016. The archive comprises nine different heart sound databases…