Éditeur(s) : HAL CCSD
Résumé : This paper studies the biological and economic effects of globalwarming on the French Guiana shrimp …fishery. The sea surface tem-perature is explicitly introduced into four natural growth functions,among which the Cobb-Douglas function best adjusts the availabledata. Besides, a Cobb-Douglas harvest function is also estimated, in-dicating that shrimp production in French Guiana is highly sensitive tothe shrimp stock, which implies that global warming may have strongeconomic implications. We …nally consider a centralized resource man-agement of the French Guiana shrimp …shery, that is undertaken invarious trend scenarios concerning the sea surface temperature. Un-der the most plausible scenario, in which the sea surface temperaturefollows the trend of the last decades, pro…ts and biomass respectivelydecrease and collapse around the end of the 2020’s.
https://hal.univ-antilles.fr/hal-01243305

hal-01243305
https://hal.univ-antilles.fr/hal-01243305
https://hal.univ-antilles.fr/hal-01243305/document
https://hal.univ-antilles.fr/hal-01243305/file/Diop%20et%20al.%20%282015%29.pdf

Éditeur(s) : HAL CCSD Elsevier
Résumé : International audience
The aim of this paper is to investigate the asymptotic behavior of an inertial alternating algorithm based on the composition of resolvents of monotone operators. The proposed algorithm is a generalization of those proposed in Attouch et al. (2007) and Bauschke et al. (2005). As a special case, we also recover the classical alternating minimization algorithm (Acker, 1980), which itself is a natural extension of the alternating projection algorithm of von Neumann (1950) [4]. An application to equilibrium problems is also proposed.
ISSN: 0893-9659

hal-00776658
https://hal.univ-antilles.fr/hal-00776658
DOI : 10.1016/j.aml.2010.01.023

Éditeur(s) : HAL CCSD Réseau « Développement durable et territoires fragiles »
Résumé : La Trame verte et bleue (TVB), nouveau dispositif d'action publique visant à enrayer la perte de biodiversité traduit un renouvellement des référentiels de justification des politiques de conservation et de leur stratégie territoriale. Il s'agit d'intégrer la planification écologique dans l'aménagement de l'ensemble du territoire. Le processus de territorialisation de la TVB met en rapport de multiples niveaux de décision et d'action imbriqués. Il crée de ce fait des configurations inédites de complexité et d'incertitude et implique des innovations en termes de gouvernance que le cadre analytique de la gouvernance adaptative permet d'appréhender. En nous appuyant sur l'exemple du Parc Naturel Régional des Volcans d'Auvergne, nous analysons le rôle que ces institutions sont susceptibles de jouer dans ces dynamiques de changement et d'apprentissage socio-technique et politique qui conditionnent une mise en œuvre effective de la TVB.
Développement Durable et territoires

hal-00979610
https://hal-agroparistech.archives-ouvertes.fr/hal-00979610

Éditeur(s) : HAL CCSD
Résumé : International audience
« Les modes de production agricole traditionnels en Martinique, leviers de développement durable ? »
Le Lamentin, Martinique

hal-01515892
https://hal-agroparistech.archives-ouvertes.fr/hal-01515892

Éditeur(s) : HAL CCSD Maison des Sciences de l'Homme et de la Société, Université de Poitiers ITEEM ICOTEM
Résumé : International audience
Alors que l'espace rural connaît une fréquentation touristique croissante, que le tourisme devient un véritable secteur économique dans certaines campagnes, les agriculteurs sont confrontés à une conjoncture difficile. Bien que le tourisme à la ferme soit encore très peu développé en France, le contexte actuel semble favorable à une diversification des activités, notamment au profit du tourisme vert.
Les nouveaux espaces ruraux de l'Europe atlantique

ISBN : 2-9513060-4-4
hal-01406719
https://hal.archives-ouvertes.fr/hal-01406719
https://hal.archives-ouvertes.fr/hal-01406719/document
https://hal.archives-ouvertes.fr/hal-01406719/file/2000%20les%20agriculteurs%20face%20au%20tourisme.pdf

Éditeur(s) : HAL CCSD Université des Antilles
Résumé : International audience
Cruise tourism is a sector that is rapidly expanding (16 million passengers in 2011). Today, cruising remains an essentially American affair, dominated by North American clients whose preferred destination is the Caribbean Sea. American cruise circuits continue to extend and diversify from the Panama Canal to the edge of Alaska. Meanwhile, cruises strengthen their position on the Mediterranean and Baltic Seas and has launched in East Asia from shores of the South China Sea to major rivers. Between continuity and recomposition, the cruise industry faces several challenges such as the limits of overcapacity (more than 6,000 passengers on board), its relationship with the host territories (ports of call), and the renewal of the “cruise” products.
Le tourisme de croisière est un secteur d’activité en pleine expansion (16 millions de passagers en 2011). De nos jours, la croisière reste encore une affaire essentiellement américaine, dominée par les clientèles nord-américaines, et dont le champ spatial privilégié est la mer des Caraïbes. Les circuits américains de la croisière s’étendent et se diversifient, du canal du Panama aux confins de l’Alaska. Parallèlement, la croisière conforte sa position sur les mers méditerranéenne et baltique et se déploie en Asie orientale, des rivages de la mer de Chine aux grands fleuves. Entre permanences et recompositions, l’industrie de la croisière doit relever plusieurs défis tels que les limites du gigantisme (plus de 6 000 passagers à bord), ses relations avec les territoires d’accueil (les ports d’escales), le renouvellement du produit « croisière ».
ISSN: 1779-0980

Droits : http://creativecommons.org/licenses/by-nc/
hal-01368523
https://hal.univ-antilles.fr/hal-01368523
https://hal.univ-antilles.fr/hal-01368523/document
https://hal.univ-antilles.fr/hal-01368523/file/le-tourisme-de-croisiere-dans-le-monde-permanences-et-recompositions%20%281%29.pdf
DOI : 10.4000/etudescaribeennes.5629

Éditeur(s) : HAL CCSD INRIA
Résumé : National audience
Non seulement les organismes financiers se disputent les meilleurs mathématiciens mais la finance est devenue source de problèmes théoriques inédits en mathématiques.
Les Cahiers de l'INRIA - La Recherche

Droits : info:eu-repo/semantics/OpenAccess
inria-00527579
https://hal.inria.fr/inria-00527579
https://hal.inria.fr/inria-00527579/document
https://hal.inria.fr/inria-00527579/file/inria-n429-avr09.pdf

Éditeur(s) : HAL CCSD Elsevier
Résumé : International audience
Voting rules relying on k-nearest neighbors (k-NN) are an effective tool in countless many machine learning techniques. Thanks to its simplicity, k-NN classification is very attractive to practitioners, as it enables very good performances in several practical applications. However, it suffers from various drawbacks, like sensitivity to "noisy" instances and poor generalization properties when dealing with sparse high-dimensional data. In this paper, we tackle the k-NN classification problem at its core by providing a novel k-NN boosting approach. Namely, we propose a supervised learning algorithm, called Universal Nearest Neighbors (UNN), that induces a leveraged k-NN rule by globally minimizing a surrogate risk upper bounding the empirical misclassification rate over training data. Interestingly, this surrogate risk can be arbitrary chosen from a class of Bregman loss functions, including the familiar exponential, logistic and squared losses. Furthermore, we show that UNN allows to efficiently filter a dataset of instances by keeping only a small fraction of data. Experimental results on the synthetic Ripley's dataset show that such a filtering strategy is able to reject "noisy" examples, and yields a classification error close to the optimal Bayes error. Experiments on standard UCI datasets show significant improvements over the current state of the art.
ISSN: 0925-2312

hal-00664462
https://hal.inria.fr/hal-00664462

Éditeur(s) : HAL CCSD
Résumé : National audience
Séminaire Diva
Amiens, France

hal-01515897
https://hal-agroparistech.archives-ouvertes.fr/hal-01515897

Éditeur(s) : HAL CCSD
Résumé : International audience
The k-nearest neighbors (k-NN) classification rule is still an essential tool for computer vision applications, such as scene recognition. However, k-NN still features some major drawbacks, which mainly reside in the uniform voting among the nearest prototypes in the feature space. In this paper, we propose a new method that is able to learn the "relevance" of prototypes, thus classifying test data using a weighted k-NN rule. In particular, our algorithm, called Multi-class Leveraged k-nearest neighbor (MLNN), learns the prototype weights in a boosting framework, by minimizing a surrogate exponential risk over training data. We propose two main contributions for improving computational speed and accuracy. On the one hand, we implement learning in an inherently multiclass way, thus providing significant computation time reduction over one-versus-all approaches. Furthermore, the leveraging weights enable effective data selection, thus reducing the cost of k-NN search at classification time. On the other hand, we propose a kernel generalization of our approach to take into account real-valued similarities between data in the feature space, thus enabling more accurate estimation of the local class density. We tested MLNN on three datasets of natural images. Results show that MLNN significantly outperforms classic k-NN and weighted k-NN voting. Furthermore, using an adaptive Gaussian kernel provides significant performance improvement. Finally, the best results are obtained when using MLNN with an appropriate learned metric distance.
Proceedings of the 10th Asian Conference on Computer Vision, ACCV 2010, November 8-12, 2010, Queenstown, New Zealand
Queenstown, New Zealand

hal-00664606
https://hal.inria.fr/hal-00664606
https://hal.inria.fr/hal-00664606/document
https://hal.inria.fr/hal-00664606/file/mlnn_accvfinal.pdf

Éditeur(s) : HAL CCSD
Résumé : International audience
https://hal.archives-ouvertes.fr/hal-01625514

hal-01625514
https://hal.archives-ouvertes.fr/hal-01625514

Éditeur(s) : HAL CCSD
Résumé : The mangroves play a vital role in the ecological balance. They provide marine ecosystem resources and are involved in its stabilization and in the coastal protection. They constitute the growth areas of many species that feed marine species and particularly shrimp. We develop a standard fishery model by integrating mangroves area into the analysis. The extended model shows that mangrove plays animportant role in shrimp production and data related to it are well supported by the model. We analyze the e¤ects of mangrove on open access of the French Guiana shrimp fishery and show that mangrove is not the only factor that plays a vital role in the French Guiana shrimp fishery.
https://hal.univ-antilles.fr/hal-01383024

hal-01383024
https://hal.univ-antilles.fr/hal-01383024
https://hal.univ-antilles.fr/hal-01383024v2/document
https://hal.univ-antilles.fr/hal-01383024/file/Diop%20et%20al.%20%282016%29.pdf

Éditeur(s) : HAL CCSD Cnrs
Résumé : International audience
Tourism, Labour, Migration : Relationships and Human Mobility. -- A significant economic reality, the tourism market is at the origin of new and varied migratory paths in an increasingly restrictive international context. Established and emerging tourist destinations provide interesting laboratories in which to analyse the logic of the multiple forms of contemporary mobility. They constitute platforms that receive flows of tourists and workers from which new migratory paths are forged. At the meeting points between various flows, interrelationships, overlappings, and new filiations take shape.
Turismo, trabajo, migración : interrelaciones y lógicas de movilidad. -- Como realidad económica consolidada, el mercado turístico se encuentra en el centro de trayectorias migratorias diversas y renovadas en un contexto internacional cada vez más complejo. Las zonas turísticas -las clásicas y las emergentes- constituyen interesantes laboratorios a la hora de analizar la lógica de las movilidades contemporáneas y sus múltiples recomposiciones.Estos lugares, que reciben flujos de turistas y trabajadores, son una especie de plataformas que generan nuevas corrientes migratorias. En estos puntos de encuentro entre flujos diversos surgen interrelaciones, imbricaciones, filiaciones.
Réalité économique établie, le marché touristique est au coeur de trajectoires migratoires variées et renouvelées dans un contexte international de plus en plus contraignant. Les lieux touristiques, anciens et émergents, constituent d'intéressants laboratoires pour analyser les logiques des mobilités contemporaines et leurs recompositions multiformes. Ils constituent des plates-formes qui reçoivent des flux de touristes et de travailleurs à partir desquelles s'établissent de nouvelles trajectoires migratoires. De ces points de rencontre entre des flux variés où se dessinent des interrelations, des chevauchements, des filiations.
ISSN: 0765-0752

hal-01413567
https://hal.univ-antilles.fr/hal-01413567
https://hal.univ-antilles.fr/hal-01413567/document
https://hal.univ-antilles.fr/hal-01413567/file/2002%20Tourisme%2C%20travail%2C%20migration%20interrelation%20et%20logiques%20mobilitaires.pdf
DOI : 10.4000/remi.1676

Éditeur(s) : HAL CCSD IEEE
Résumé : International audience
Recent works display that large scale image classification problems rule out computationally demanding methods. On such problems, simple approaches like k-NN are affordable contenders, with still room space for statistical improvements under the algorithmic constraints. A recent work showed how to leverage k-NN to yield a formal boosting algorithm. This method, however, has numerical issues that make it not suited for large scale problems. We propose here an Adaptive Newton-Raphson scheme to leverage k-NN, N³, which does not suffer these issues. We show that it is a boosting algorithm, with several key algorithmic and statistical properties. In particular, it may be sufficient to boost a subsample to reach desired bounds for the loss at hand in the boosting framework. Experiments are provided on the SUN, and Caltech databases. They confirm that boosting a subsample -- sometimes containing few examples only -- is sufficient to reach the convergence regime of N³. Under such conditions, N³ challenges the accuracy of contenders with lower computational cost and lower memory requirement.
IEEE International Workshop on Machine Learning for Signal Processing
Southampton, United Kingdom

hal-00959125
https://hal.archives-ouvertes.fr/hal-00959125
https://hal.archives-ouvertes.fr/hal-00959125/document
https://hal.archives-ouvertes.fr/hal-00959125/file/BNNB_mlsp2013.pdf

Éditeur(s) : HAL CCSD
Résumé : International audience
o abstract
http://hal.univ-reunion.fr/hal-01454718

hal-01454718
http://hal.univ-reunion.fr/hal-01454718

Éditeur(s) : HAL CCSD
Résumé : International audience
VI Semana Latinoamarican y Caribeña en la Simon
Caracas, Venezuela

hal-01634310
https://hal.archives-ouvertes.fr/hal-01634310

Éditeur(s) : HAL CCSD Université des Antilles
Résumé : International audience
Tourism in coastal and island environments: Continuity, limits and perspectives Coastlines and islands are particularly affected by the development of tourism worldwide. Between "desire costal" and "fantasy Island", its coveted spaces for both their tangible and intangible dimensions, open to tourism. Attracted by the economic opportunities they so desperately need, more or less aware of their comparative advantage and their limitations, they deliver resources preserved, the most vulnerable, which are the subject of complex relationships and issues.
Les littoraux et les îles sont des espaces particulièrement prisés par le développement du tourisme à travers le monde. Entre " désir de rivages " et " île fantasmée ", ces espaces convoités, tant pour leurs dimensions tangibles qu'intangibles, s'ouvrent au tourisme. Séduits par les opportunités économiques dont ils ont tant besoin, plus ou moins conscients de leur avantage comparatif et de leurs limites, ils livrent des ressources préservées, des plus vulnérables, autour desquelles se construisent de complexes relations et enjeux.
ISSN: 1779-0980

hal-00830502
https://hal.archives-ouvertes.fr/hal-00830502
https://hal.archives-ouvertes.fr/hal-00830502/document
https://hal.archives-ouvertes.fr/hal-00830502/file/etudescaribeennes-5774-19-le-tourisme-dans-les-environnements-littoraux-et-insulaires-permanences-limites-et-perspectives.pdf

Éditeur(s) : HAL CCSD
Résumé : International audience
Service Management

hal-01270575
https://hal.archives-ouvertes.fr/hal-01270575

Éditeur(s) : HAL CCSD
Résumé : International audience
Several assessments of vulnerability and resilience have been attempted at a country level through composite indices but they are barely in accord with a holistic view of sustainable development. We suggest graph theory to structure a network of variables that depict vulnerability and resilience from a sustainable development perspective. Vulnerability is defined as the propensity to incur adverse shocks whereas resilience is the capacity to cope with their negative effects. We identify two control dimensions of vulnerability–resilience (economic and political) and three contingency factors (the social, environmental and the peripheral dimensions). The specificity of the control dimensions is rooted in their impact on all other sides of the pentagon. We propose an algorithm to select the key variables useful in building a composite index that conforms to the structure of these five dimensions while preventing loss of information. An application is provided on Singapore, which has been specified as a typical case of resilience.
Economic Modelling

hal-01291338
https://hal.archives-ouvertes.fr/hal-01291338

Éditeur(s) : HAL CCSD
Résumé : International audience
3rd International Conference on Ecosystem Assessment Management (EAM) and Workshop on the Construction of an Early Warning Platform for Eco-Tourism
Hainan, China

hal-01641004
https://hal.univ-antilles.fr/hal-01641004