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Search Results: 1 - 10 of 4360 matches for " ELISENDA; MOLINA "
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The Shapley group value
Ramón Flores,Elisenda Molina,Juan Tejada
Mathematics , 2014,
Abstract: Following the original interpretation of the Shapley value (Shapley, 1953a) as a priori evaluation of the prospects of a player in a multi-person interaction situation, we propose a group value, which we call the Shapley group value, as a priori evaluation of the prospects of a group of players in a coalitional game when acting as a unit. We study its properties and we give an axiomatic characterization. Relaying on this valuation we analyze the profitability of a group. We motivate our proposal by means of some relevant applications of the Shapley group value, when it is used as an objective function by a decisionmaker who is trying to identify an optimal group of agents in a framework in which agents interact and the attained benefit can be modeled bymeans of a transferable utility game. As an illustrative examplewe analyze the problem of identifying the set of key agents in a terrorist network.
La escogencia estratégica y su aplicación en la formulación de planes para el manejo de residuos sólidos municipales. Caso de estudio: Municipio Libertador - Distrito Capital
SáNCHEZ,REBECA; BENAIES,ANA M; VILA,ELISENDA; MOLINA,MANUEL;
Revista de la Facultad de Ingeniería Universidad Central de Venezuela , 2006,
Abstract: in venezuela for several decades, graduate school town planning students have focused on urban problem studies, simulation models and plans to ?solve? problems. in most venezuelan cities, urban planning has often not been implemented. even worse, curricula have underestimated methods for structuring problems and for making decisions under pressure and with little data. however, over the last decade, some professors have introduced workshops on the strategic choice approach of j. friend and a. hickling (2002) in the master?s course in town planning policies and local action at the instituto de urbanismo of the universidad central de venezuela. the aim is to allow students to make proposals for the immediate improvement of downtown zones in caracas as there is not enough time to make and approve ?plans?. this case study, the solid waste management in downtown caracas, results from work carried out with professors and students for the libertador municipality. this experience allowed us to make immediate proposals for the decision takers in a short period of time, jointly with the agencies involved in the problems, as well as to identify mid-term studies.
Un modelo de gestión para el saneamiento integral En sectores con alta complejidad en su medio físico y social: énfasis en el componente desechos sólidos
Sánchez,Rebeca; Benaiges,Ana María; Vila,Elisenda; Molina,Manuel;
Revista de la Facultad de Ingeniería Universidad Central de Venezuela , 2009,
Abstract: this paper present a case study carried out in one of caracas? shantytowns; all of which present serious problems in terms of the provision of basic services for the municipalities which make up the capital city, thus making appropriate management models a necessity. the interaction between the institution responsible for solid waste collection and the municipality in question shows the need to design a strategy which includes a participative plan and social control. the analysis and discussion of this problem provides us with the opportunity of changing the main principles of the service management and to implement new strategies to guarantee sanitary conditions. these principles are responsibility and cooperation
Adams operations on higher arithmetic K-theory
Elisenda Feliu
Mathematics , 2009,
Abstract: We construct Adams operations on the rational higher arithmetic K-groups of a proper arithmetic variety. The definition applies to the higher arithmetic K-groups given by Takeda as well as to the groups suggested by Deligne and Soule, by means of the homotopy groups of the homotopy fiber of the regulator map. They are compatible with the Adams operations on algebraic K-theory. The definition relies on the chain morphism representing Adams operations in higher algebraic K-theory given previously by the author. In this paper it is shown that a slight modification of this chain morphism commutes strictly with the representative of the Beilinson regulator given by Burgos and Wang.
A chain morphism for Adams operations on rational algebraic K-theory
Elisenda Feliu
Mathematics , 2008,
Abstract: For any regular noetherian scheme X and every k>0, we define a chain morphism between two chain complexes whose homology with rational coefficients is isomorphic to the algebraic K-groups of X tensored by the field of rational numbers. It is shown that these morphisms induce in homology the Adams operations defined by Gillet and Soule or the ones defined by Grayson.
On uniqueness of characteristic classes
Elisenda Feliu
Mathematics , 2006,
Abstract: We give an axiomatic characterization of maps from algebraic K-theory. The results apply to a class of maps from algebraic K-theory to any suitable cohomology theory or to algebraic K-theory, which includes all group morphisms. In particular, we obtain comparison theorems for the Chern character and Chern classes and for the Lambda and Adams operations on higher algebraic K-theory. We show that the Adams operations defined by Grayson agree with the ones defined by Gillet and Soule.
Injectivity, multiple zeros, and multistationarity in reaction networks
Elisenda Feliu
Quantitative Biology , 2014, DOI: 10.1098/rspa.2014.0530
Abstract: Polynomial dynamical systems are widely used to model and study real phenomena. In biochemistry, they are the preferred choice for modelling the concentration of chemical species in reaction networks with mass-action kinetics. These systems are typically parameterised by many (unknown) parameters. A goal is to understand how properties of the dynamical systems depend on the parameters. Qualitative properties relating to the behaviour of a dynamical system are locally inferred from the system at steady state. Here we focus on steady states that are the positive solutions to a parameterised system of generalised polynomial equations. In recent years, methods from computational algebra have been developed to understand these solutions, but our knowledge is limited: for example, we cannot efficiently decide how many positive solutions the system has as a function of the parameters. Even deciding whether there is one or more solutions is non-trivial. We present a new method, based on so-called injectivity, to preclude or assert that multiple positive solutions exist. The results apply to generalised polynomials and variables can be restricted to the linear, parameter-independent first integrals of the dynamical system. The method has been tested in a wide range of systems.
Patrimonio gastronómico y turismo cultural en el Mediterráneo. Jordi Tresserras y F. Xavier Medina (eds.).
Loscos Presculí, Elisenda
PASOS : Revista de Turismo y Patrimonio Cultural , 2008,
Abstract:
Sitkis : una herramienta bibliométrica para el desarrollo del estado de la cuestión
Tarrats Pons, Elisenda
BiD : Textos Universitaris de Biblioteconomia i Documentació , 2012, DOI: 10.1344/105.000001831
Abstract: En las primeras fases de una investigación es fundamental la detección de los autores y publicaciones más relevantes de la materia objeto de la investigación. Sitkis, como herramienta bibliométrica, facilita el proceso de búsqueda, selección y tratamiento de información científica de alta calidad. A continuación especificamos la descripción de este programa, su funcionamiento, las utilidades principales así como sus limitaciones. Como conclusión destacaríamos su utilidad y conveniencia en el desarrollo del estado de la cuestión de una investigación o de una tesis doctoral.In the initial stages of a research project, identifying the most relevant authors and publications in the particular field of study is fundamental. Sitkis, a bibliometric tool, aids the research process by facilitating the selection and treatment of high quality scientific information. We outline the specifications of the program, describing its operation and identifying its main uses and limitations. In conclusion, we highlight its usefulness and appropriateness in undertaking state-of-the-art reviews of a research field or for a doctoral thesis.
Sitkis : una eina bibliomètrica pel desenvolupament de l'estat de la qüestió
Tarrats Pons, Elisenda
BiD : Textos Universitaris de Biblioteconomia i Documentació , 2012, DOI: 10.1344/105.000001830
Abstract: En les primeres fases d'una investigació, esdevé fonamental la detecció dels autors i publicacions més rellevants de la matèria objecte d'investigació. Sitkis, com a eina bibliomètrica, facilita el procés de recerca, selecció i tractament d'informació científica d'alta qualitat. A continuació especifiquem la descripció d'aquest programari, el funcionament, les utilitats principals, així com les limitacions. Com a conclusió destacaríem la seva utilitat i conveniència en el desenvolupament de l'estat de la qüestió d'una investigació o d'una tesi doctoral.In the initial stages of a research project, identifying the most relevant authors and publications in the particular field of study is fundamental. Sitkis, a bibliometric tool, aids the research process by facilitating the selection and treatment of high quality scientific information. We outline the specifications of the program, describing its operation and identifying its main uses and limitations. In conclusion, we highlight its usefulness and appropriateness in undertaking state-of-the-art reviews of a research field or for a doctoral thesis.
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