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Search Results: 1 - 10 of 5117 matches for " Angela Ricciardello "
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Non-reactive strategies in decision-form games
David Carfi`,Angela Ricciardello
Atti della Accademia Peloritana dei Pericolanti : Classe di Scienze Fisiche, Matematiche e Naturali , 2009,
Abstract: In this paper we propose a concept of rationalizable solution for two-playerdecision-form games: the solution by iterated elimination of non-reactivestrategies. Several original theorems are proved about this kind ofsolution. We study the relations between solutions by iterated eliminationof non reactive strategies and game equilibria. We present an existencetheorem for bistrategies surviving the iterated elimination and an existencetheorem for solution by iterated elimination in contracting games. We, also,show that an equilibrium of a game survives iterated elimination of nonreative strategies. At the end we prove a characterization of solvability byiterated elimination of non-reactive strategies.
An algorithm for payoff space in C1-games
David Carfì,Angela Ricciardello
Atti della Accademia Peloritana dei Pericolanti : Classe di Scienze Fisiche, Matematiche e Naturali , 2010,
Abstract: In this paper we present an algorithm implemented by MATLAB, and several examples completely realized by this algorithm, based on a method developed by one of the authors to determine the payoff-space of certain normal-form C1-games. Specifically, our study is based on a method able to determine the payoff space of normal form C1-games in n dimensions, that is for n-players normal form games whose payoff functions are defined on compact intervals of the real line and of class at least C1. In this paper we will determine the payoff space of such normal form C1-games in the particular case of two dimensions. The implementation of the algorithm gives the parametric form of the critical zone of a game in the bistrategy space and in the payoff space and their graphical representations. Moreover, we obtain the parametric form of the transformation of the topological boundary of the bistrategy space and of the transformation of the critical zone. The final aim of the program is to plot the entire payoff space of the considered games. One of the main motivations of our paper is that the mixed extension of a bimatrix game - the most used in the application of Game Theory - is a game of the type considered. For this reason we realized an algorithm that produces the payoff space and the critical zone of a game in normal form supported by a finite family of compact intervals of the real line. Resuming in details, the algorithm returns: the parametric form of the critical zone; the parametric form of the transformation of the topological boundary of the bistrategy space; the parametric form of the transformation of the critical zone. All of them are graphically represented. To prove the efficiency of the algorithm, we show several examples. Our final goal is to provide a valuable tool to study simply but completely normal form C1-games in two dimensions.
Mixed Extensions of decision-form games
David Carfì,Angela Ricciardello
Physics , 2011,
Abstract: In this paper we define the canonical mixed extension of a decision form game. We motivate the necessity to introduce this concept and we show several examples about the new concept. In particular we focus our study upon the mixed equilibria of a finite decision form game. Many developments appear possible for applications to economics, physics, medicine and biology in those cases for which the systems involved do not have natural utility functions but are only capable to react versus the external actions.
Preface: Introducing PISRS
David Carfì,Francesco Musolino,Angela Ricciardello,Daniele Schilirò
Atti della Accademia Peloritana dei Pericolanti : Classe di Scienze Fisiche, Matematiche e Naturali , 2012, DOI: 10.1478/aapp.90s1e1
Abstract: Introductory notes on the Special Issue dedicated to the Permanent International Session of Research Seminars (PISRS) held in 2011 at the DESMaS Department of the University of Messina.
A Novel Measure of Edge Centrality in Social Networks
Pasquale De Meo,Emilio Ferrara,Giacomo Fiumara,Angela Ricciardello
Computer Science , 2013, DOI: 10.1016/j.knosys.2012.01.007
Abstract: The problem of assigning centrality values to nodes and edges in graphs has been widely investigated during last years. Recently, a novel measure of node centrality has been proposed, called k-path centrality index, which is based on the propagation of messages inside a network along paths consisting of at most k edges. On the other hand, the importance of computing the centrality of edges has been put into evidence since 1970's by Anthonisse and, subsequently by Girvan and Newman. In this work we propose the generalization of the concept of k-path centrality by defining the k-path edge centrality, a measure of centrality introduced to compute the importance of edges. We provide an efficient algorithm, running in O(k m), being m the number of edges in the graph. Thus, our technique is feasible for large scale network analysis. Finally, the performance of our algorithm is analyzed, discussing the results obtained against large online social network datasets.
Women entrepreneurship in Romania
Angela ON
Revista Romana de Economie , 2011,
Abstract: Considering entrepreneurship the domain with the greatest potential for creativity and innovation, any investigation on this field is recommended, in order to reveal new aspects that can influence the small enterprises development. From this point of view, female entrepreneurship represents an important source of innovation, only partially exploited or even forgotten.
Impact of Simulated Airborne Soot on Maize Growth and Development  [PDF]
Angela Anda, Berndett Illes
Journal of Environmental Protection (JEP) , 2012, DOI: 10.4236/jep.2012.38092
Abstract: Various effects of the dry deposition of soot on maize were investigated in Keszthely (Hungary) in two consecutive years. In order to be able to study a wider range of weather conditions, some of the plants were placed in a Thornthwaite-Matter type evapotranspirometer and given ad libitum water supplies. Pollution with airborne black carbon was simulated throughout the season by distributing rates of 3 g?m–2 a week using a motorised dust sprayer. Among the plant growth parameters, the leaf area index was increased by 3% - 14%, depending on the year, suggesting that the plants were able to absorb the carbon settling on the leaves. The black carbon reduced the albedo of the canopy by 17.5% - 21.8%, depending on the year, forcing the polluted maize to absorb more energy. Part of this surplus energy was utilised for increased evapotranspiration (3.9% and 11% in the two years) and to raise the surface temperature of the canopy by 1℃ - 2℃ during the mid-day hours. The effect of the contamination on maize was more intense in the hot, dry year. The unfavourable effect of soot on maize fertilisation could be observed as a significant increase in the number of deformed ears, leading to a reduction in grain dry matter. The reduction in dry matter yield for polluted maize grown with irrigation in the evapotranspirometer was far less severe than that on non-irrigated plots, suggesting that irrigation was the most obvious solution for mitigating the negative effects of contamination with airborne soot.
Current Attitudes of Anesthesiologists towards Medically Futile Care  [PDF]
Angela Saettele,Joseph Kras
Open Journal of Anesthesiology (OJAnes) , 2013, DOI: 10.4236/ojanes.2013.34048
Abstract: Purpose: To explore anesthesiologists’ perceptions of the reasons underlying why physicians continue to provide care that they consider futile. Methods: A qualitative study was conducted utilizing a grounded theory approach. Four separate focus groups (2 resident physician groups and 2 attending physician groups) were conducted over a three week span. An interview guide was used consisting of a proposed definition of futility and five open-ended questions. Responses to the five open-ended questions were used to guide follow up questions. Transcribed audio recordings were then analyzed. Results: With data reduction, we were able to separate responses into definitions of futility, stories of cases where futile care was provided, and opinions as to the underlying causes of continuing to provide futile care. A variety of opinions was obtained, suggesting the possibility that different groups (surgeons, anesthesiologists, family members) view questions of futility differently. Conclusions: Complete agreement on a definition of futility does not exist. Even when some agreement exists, there is great difficulty in predicting outcomes in individual cases. Future quantitative studies may provide more evidence of trends in underlying reasons for providing futile care. Focused education efforts may then lead to more agreement between all involved.
Current Attitudes of Anesthesiologists towards Medically Futile Care  [PDF]
Angela Saettele, Joseph Kras
Open Journal of Anesthesiology (OJAnes) , 2013, DOI: 10.4236/ojanes.2013.34048
Abstract:

Purpose: To explore anesthesiologists’ perceptions of the reasons underlying why physicians continue to provide care that they consider futile. Methods: A qualitative study was conducted utilizing a grounded theory approach. Four separate focus groups (2 resident physician groups and 2 attending physician groups) were conducted over a three week span. An interview guide was used consisting of a proposed definition of futility and five open-ended questions. Responses to the five open-ended questions were used to guide follow up questions. Transcribed audio recordings were then analyzed. Results: With data reduction, we were able to separate responses into definitions of futility, stories of cases where futile care was provided, and opinions as to the underlying causes of continuing to provide futile care. A variety of opinions was obtained, suggesting the possibility that different groups (surgeons, anesthesiologists, family members) view questions of futility differently. Conclusions: Complete agreement on a definition of futility does not exist. Even when some agreement exists, there is great difficulty in predicting outcomes in individual cases. Future quantitative studies may provide more evidence of trends in underlying reasons for providing futile care. Focused education efforts may then lead to more agreement between all

Keeping the White Family Together: Racial Disparities in the Out-of-Home Placements of Maltreated Children  [PDF]
Angela M. Kaufman
Advances in Applied Sociology (AASoci) , 2013, DOI: 10.4236/aasoci.2013.38041
Abstract: The likelihood of being removed from the home following a case of maltreatment is much higher for black youth than for whites. Two explanations exist in the literature. The first, black children experience more serious forms of maltreatment and have fewer resources to remedy the maltreatment situation than do whites. The second, there is an underlying racial bias within the child welfare system. The present study examines 789 dependency cases from child welfare services in a large urban county in the Northwest United States. Using multiple logistic regression models, it examines whether race has an effect on child placement within the child welfare system, and whether the factors influencing placement are the same for white and black youth. Findings illustrate a racial disparity in out-of-home placements supporting both of the competing explanations in the current literature. Overall, the present study finds that two separate processes seem to be at play in the placement decisions of maltreated youth, and concludes with possible explanations for this differential treatment.
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