Search results for "Operations"
showing 10 items of 1692 documents
Non-stationarity tests and nonlinear trends
1992
This paper stresses the importance of the hypothesis of linearity of the deterministic component imposed by unit root testing procedures most frequently used in empirical literature. We suggest an empirical testing strategy which reduces the risk of reaching false conclusions due to the misspecification of that component and we apply it to the analysis of the nonstationarity exhibited by real GNP in France. We show that it is possible to find someflexible specifications which enable us to reject the unit root null hypothesis otherwise strongly supported in empirical literature. These specifications might be considered as approximations of the true process generating real GNP and might be us…
Distances, espaces et représentations (une revue)
1990
L'objet de cet article est de donner un aperçu de la manière dont la littérature traite ce rapport entre la forme de la distance et les propriétés de l'espace. Il existe un grand nombre de travaux dans ce domaine et, malgré le volume de ce texte, nous ne pouvons en rendre compte complètement. La section 1 présente les formes de distances les plus connues et montre les déformations qu'elles impliquent par rapport à l'espace réel, observé, ainsi que par rapport à sa représentation la plus commune: l'espace euclidien muni d'une distance euclidienne. La section 2 porte le débat au niveau des modèles de l'économie spatiale. Il y a plusieurs façons de modéliser une même réalité: la représentation…
Classifying efficient alternatives in SMAA using cross confidence factors
2006
Abstract Stochastic multicriteria acceptability analysis (SMAA) is a family of methods for aiding multicriteria group decision making. These methods are based on exploring the weight space in order to describe the preferences that make each alternative the most preferred one. The main results of the analysis are rank acceptability indices, central weight vectors and confidence factors for different alternatives. The rank acceptability indices describe the variety of different preferences resulting in a certain rank for an alternative; the central weight vectors represent the typical preferences favouring each alternative; and the confidence factors measure whether the criteria data are suff…
Stochastic Multicriteria Acceptability Analysis (SMAA)
2010
Stochastic multicriteria acceptability analysis (SMAA) is a family of methods for aiding multicriteria group decision making in problems with uncertain, imprecise or partially missing information. These methods are based on exploring the weight space in order to describe the preferences that make each alternative the most preferred one, or that would give a certain rank for a specific alternative. The main results of the analysis are rank acceptability indices, central weight vectors and confidence factors for different alternatives. The rank acceptability indices describe the variety of different preferences resulting in a certain rank for an alternative, the central weight vectors represe…
A methodology for the reduction of imprecision in the engineering process
1997
Abstract Engineering design is characterized by a high level of imprecision, vague parameters, and ill-defined relationships. In design, imprecision reduction must occur to arrive at a final product specification. Few design systems exist for adequately representing design imprecision, and formally reducing it to precise values. Fuzzy set theory has considerable potential for addressing the imprecision in design. However, it lacks a formal methodology for system development and operation. One repercussion of this is that imprecision reduction is, at present, implemented in a relatively ad-hoc manner. The main contribution of this paper is to introduce a methodology called precision converge…
New Trend to Evaluate the Management of Companies: An Application of the Methodologies of Radar Chart
2014
The methodology of radar chart arises as an alternative answer to traditional measures on management of companies' activities. How to answer to market disruptions? It is a question solved by this methodology, which allows us to measure the management of each area represented on a radar chart by applying principles of plane geometry. In this methodology, a decision on a management area affects to the result of other areas because it has a multidirectional effect. Its application is carried out on a Spanish company.
Cognitive Translation and Interpreting Studies (CTIS)
2021
Factores asociados a los accidentes de motocicleta en Barcelona, España
2019
espanolResumen: Este estudio analizo los accidentes de motocicleta y ciclomotor en Barcelona (Espana). 53.190 informes de conductores de motocicleta y ciclomotor involucrados en accidentes entre los anos 2006 y 2011 fueron extraidos de la base de datos de accidentes con victimas de la Direccion General de Trafico. Estos datos fueron analizados en terminos de sexo, grupos de edad, motivo del desplazamiento, dia de la semana, infracciones de velocidad, uso del casco y lesividad, con el objetivo de estudiar las caracteristicas de los accidentes de motocicleta y ciclomotor en Barcelona y evaluar las diferencias entre conductores varones y mujeres en estos accidentes. La gravedad de los accident…
Evaluating the (Your Country Here) Olympic Medal Count
2013
An Olympic Games is a measurable test of a nation´s sporting power. Medal counts are the object of intense scrutiny after every Olympiad. Most countries celebrate any medal with national glee, since 60% of competing countries will win none. In 2012, 10% of the competing countries won 75% of all medals. Despite this concentration among a few countries, more countries are winning more medals now than 20 years ago, thanks in part to athlete-support and -development programs arising around the globe. Small strong sporting countries like Norway are typified by fairly large variation in medal results from Olympiad to Olympiad and a high concentration of results in a few sports. These are importan…
Towards farm-level health management of offshore wind farms for maintenance improvements
2015
This paper studies a conceptual architecture for health management of offshore wind farms. To this aim, various necessary enablers of a health management sys- tem are presented to improve reliability and availability while optimizing maintenance costs. The main focus lies on improving existing condition monitoring systems based on concepts of condition-based maintenance and relia- bility centered maintenance. A brief review of the rel- evant state-of-the-art is presented and gaps to be filled towards realization of such health management system are discussed.