Search results for "DISTANCE"
showing 10 items of 1009 documents
DISTATIS: The Analysis of Multiple Distance Matrices
2006
In this paper we present a generalization of classical multidimensional scaling called DISTATIS which is a new method that can be used to compare algorithms when their outputs consist of distance matrices computed on the same set of objects. The method first evaluates the similarity between algorithms using a coefficient called the RV coefficient. From this analysis, a compromise matrix is computed which represents the best aggregate of the original matrices. In order to evaluate the differences between algorithms, the original distance matrices are then projected onto the compromise. We illustrate this method with a "toy example" in which four different "algorithms" (two computer programs …
Capital humain et compétences de base des adultes : production et valorisation
2013
Basic skills are important in current policies because of high costs generated by illiteracy and supported by the society. The aim of the present thesis is to bring a new contribution on this thematic in a microeconomic approach. It consists of two parts. The first one concerns the valorization of basic skills on the labor market, through chapters 1 and 2, while the second one concerns the production of French skills according to the migratory origins, through chapters 3 and 4. Chapter 1 is about the returns to basic skills on the labor market, in terms of overeducation/undereducation and in terms of wages. The central hypothesis is to assume that education, through the diploma, is not a go…
On the Choice of the Most Suitable Period to Map Hill Lakes via Spectral Separability and Object-Based Image Analyses
2023
Technological advances in Earth observation made images characterized by high spatial and temporal resolutions available, nevertheless bringing with them the radiometric heterogeneity of small geographical entities, often also changing in time. Among small geographical entities, hill lakes exhibit a widespread distribution, and their census is sometimes partial or shows unreliable data. High resolution and heterogeneity have boosted the development of geographic object-based image analysis algorithms. This research analyzes which is the most suitable period for acquiring satellite images to identify and delimitate hill lakes. This is achieved by analyzing the spectral separability of the su…
Generalization of novel names for relations in comparison settings: the role of conceptual distance during learning and at test
2018
International audience; Relational categories are notoriously difficult to learn. We studied the impact of comparison on relational concept learning with a novel word learning task in 3- and 4-year olds. We contrasted a no-comparison (single) condition and two comparison conditions. In the latter case, the set of learning pairs was composed of either close or far pairs (e.g., close pair: knife1- watermelon, knife2-orange; far pair: ax-evergreen tree, saw-log, for the “cutter for” relation). We also manipulated the transfer stimuli semantic distance (near or distant semantic domain, e.g., a scissor for a piece of paper in the close case, and a shaver for a face in the far domain case). The n…
Revista electrónica de investigación y evaluación educativa
2016
Este estudio evalúa un procedimiento nuevo para el análisis “micro-sociométrico” de los patrones relacionales de género en el alumnado adolescente, lo que se analiza aplicando Análisis de Correspondencias Múltiples (ACM). El propósito del estudio es desarrollar y validar la Escala de Preferencias Relacionales de Género (EPRG), con el fin de obtener datos válidos y fiables que permitan reconocer la predisposición de las chicas y los chicos adolescentes a relacionarse con sus iguales; y, si las relaciones que establecen están condicionadas por la socialización diferencial de género que propone el patriarcado (Bosch, Ferrer & Alzamora, 2006; Lagarde, 1996; Lomas, 2007; Lorente, 2007; Rodríguez…
Nest aggregation and reproductive synchrony promote Lesser Kestrel Falco naumanni seasonal fitness
2013
Several factors promote coloniality by enhancing the fitness of colony members. In birds, spatial proximity among nests, breeder abundance and reproductive synchrony have been proposed as primary factors responsible for enhanced colonial defence and foraging success, which, in turn, enhance reproductive success. Whether these factors function synergistically or antagonistically remains, however, an open question due to the absence of an integrated analysis of their effects on fitness. We studied a large population of the Lesser Kestrel, Falco naumanni, a facultative colonial species, breeding in colonies of different sizes in their typical pseudo-steppe habitat. We quantified both the singu…
Motivators and Inhibitors of Distance Learning Courses Adoption
2008
The main aim of this chapter is to present an in-depth study of the factors influencing asynchronous distance learning courses purchase decision. We analyse the impact of relations with the Internet, distance course considerations, and perceived shopping risk on the decision to do an online training course. A convenience sample of 111 students attending classroom-taught postgraduate and management training programmes were used in March 2005 to obtain the information necessary to test in the Spanish market the conceptual model proposed by applying logistical regression. The results show that perceived course utility, lack of mistrust in the organising institution (service considerations), an…
Securing AODV routing protocol against black hole attack in MANET using outlier detection scheme
2017
Imposing security in MANET is very challenging and hot topic of research science last two decades because of its wide applicability in applications like defense. Number of efforts has been made in this direction. But available security algorithms, methods, models and framework may not completely solve this problem. Motivated from various existing security methods and outlier detection, in this paper novel simple but efficient outlier detection scheme based security algorithm is proposed to protect the Ad hoc on demand distance vector (AODV) reactive routing protocol from Black hole attack in mobile ad hoc environment. Simulation results obtained from network simulator tool evident the simpl…
ECAR: an Energy/Channel Aware Routing Protocol For Cooperative Wireless Sensor Networks
2011
International audience; The proliferation of low power networks like Wireless Sensor Networks (WSN) rose up new challenges. Power conservation and channel quality become the most important parameters. Obviously, hop count based routing protocols are no more adapted to such networks having power limitations and channel problems. Several alternatives were suggested to cope with these constraints. In MAC layer for example, cooperative protocols were designed to enhance the channel use: the neighbor nodes help the source to retransmit its packets. However, if the path proposed by the routing protocol contains poor channels, the cooperative communications will not save all the packets. Therefore…
Distributed routing and channel allocation in multi-channel multi-hop ad hoc networks
2013
In this paper, we propose a novel routing protocol which is integrated with channel assignment for multi-channel multi-hop wireless ad hoc networks. In such a network, each node is equipped with three transceivers. One is always tuned on a control channel which is responsible for control and broadcast messages, and the other two perform as transmitter and receiver respectively for traffic flows on different data channels. The routing protocol works in an on-demand manner, and the proposed routing discovery process selects a path that potentially traverses nodes with lighter traffic load and lower number of carried flows. With a given number of non-overlapping channels, the optimal solution …