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Search Results: 1 - 10 of 328201 matches for " Angel Sánchez "
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Entre la obsesión por la seguridad y la lucha contra la inmigración irregular: A propósito de la nueva Ley de asilo
Angel Sánchez Legido
Revista Electrónica de Estudios Internacionales , 2009,
Abstract: The goal of this contribution is to analyse the new Spanish law on asylum and subsidiary protection. Adopted last October in order to adapt the Spanish legal order to the European asylum policy developments, the new law introduces unquestionable improvements, particularly, the regulation for the first time of the subsidiary protection status and its practical equalization to the right of asylum. However, the obsession with preserving security, on the one hand, and with avoiding the use of asylum for irregular immigration aims, on the other, bring about the persistence in some cases, and new emergence in others, of measures which are questionable, if not hardly compatible with the Geneva Convention relating to the Status of Refugees.
Learning dynamics explains human behavior in Prisoner's Dilemma on networks
Giulio Cimini,Angel Sánchez
Physics , 2014, DOI: 10.1098/rsif.2013.1186
Abstract: Cooperative behavior lies at the very basis of human societies, yet its evolutionary origin remains a key unsolved puzzle. Whereas reciprocity or conditional cooperation is one of the most prominent mechanisms proposed to explain the emergence of cooperation in social dilemmas, recent experimental findings on networked Prisoner's Dilemma games suggest that conditional cooperation also depends on the previous action of the player---namely on the `mood' in which the player currently is. Roughly, a majority of people behaves as conditional cooperators if they cooperated in the past, while they ignore the context and free-ride with high probability if they did not. However, the ultimate origin of this behavior represents a conundrum itself. Here we aim specifically at providing an evolutionary explanation of moody conditional cooperation. To this end, we perform an extensive analysis of different evolutionary dynamics for players' behavioral traits---ranging from standard processes used in game theory based on payoff comparison to others that include non-economic or social factors. Our results show that only a dynamic built upon reinforcement learning is able to give rise to evolutionarily stable moody conditional cooperation, and at the end to reproduce the human behaviors observed in the experiments.
How evolution affects network reciprocity in Prisoner's Dilemma
Giulio Cimini,Angel Sánchez
Physics , 2014,
Abstract: Cooperation lies at the foundations of human societies, yet why people cooperate remains a conundrum. The issue, known as network reciprocity, of whether population structure can foster cooperative behavior in social dilemmas has been addressed by many, but theoretical studies have yielded contradictory results so far---as the problem is very sensitive to how players adapt their strategy. However, recent experiments with the prisoner's dilemma game played on different networks have shown that humans do not consider neighbors' payoffs when making their decisions, and that the network structure does not influence the final outcome. In this work we carry out an extensive analysis of different evolutionary dynamics for players' strategies, showing that the absence of network reciprocity is a general feature of those dynamics that do not take neighbors' payoffs into account. Our results, together with experimental evidence, hint at how to properly model real people's behavior.
Mesoscopic Structure Conditions the Emergence of Cooperation on Social Networks
Sergi Lozano, Alex Arenas, Angel Sánchez
PLOS ONE , 2008, DOI: 10.1371/journal.pone.0001892
Abstract: Background We study the evolutionary Prisoner's Dilemma on two social networks substrates obtained from actual relational data. Methodology/Principal Findings We find very different cooperation levels on each of them that cannot be easily understood in terms of global statistical properties of both networks. We claim that the result can be understood at the mesoscopic scale, by studying the community structure of the networks. We explain the dependence of the cooperation level on the temptation parameter in terms of the internal structure of the communities and their interconnections. We then test our results on community-structured, specifically designed artificial networks, finding a good agreement with the observations in both real substrates. Conclusion Our results support the conclusion that studies of evolutionary games on model networks and their interpretation in terms of global properties may not be sufficient to study specific, real social systems. Further, the study allows us to define new quantitative parameters that summarize the mesoscopic structure of any network. In addition, the community perspective may be helpful to interpret the origin and behavior of existing networks as well as to design structures that show resilient cooperative behavior.
Los modelos del razonamiento moral y la investigación de la ética utilizando internet: la "red de conciencia virtual", un proyecto de investigación inspirado en el coherentismo
Sánchez González, Miguel Angel;
Texto & Contexto - Enfermagem , 2005, DOI: 10.1590/S0104-07072005000100007
Abstract: the research of ethics can be done within the framework of three different models of reasoning. deductivism formulates general principles in order to deduce particular norms and individual judgments. inductivism observes cases and habitual practices to induce general norms and principles. coherentism brings together the moral experiences more significant and the ethical perceptions more reliable in order to elaborate a coherent system. principlist theories are more deductive, whereas casuist procedures are more inductive. this article analyzes the pros and cons of each one of these systems to arrive at the conclusion that the coherentism is the more adequate to give an answer to the moral problems of everyday life. finally we present a research project called "net of virtual conscience" which tries to take advantage of the moral experiences and perceptions of a group of persons working in internet with the webct program offered by the complutense university of madrid.
Los modelos del razonamiento moral y la investigación de la ética utilizando internet: la "red de conciencia virtual", un proyecto de investigación inspirado en el coherentismo
Miguel Angel Sánchez González
Texto & Contexto - Enfermagem , 2005,
Abstract: La investigación de la ética puede hacerse utilizando tres diferentes modelos de razonamiento. El deductivismo, que formula principios generales para deducir normas particulares y juicios individuales. El inductivismo, que observa los casos y las prácticas habituales para inducir normas y principios. Y el coherentismo, que reúne las experiencias morales más significativas y las percepciones éticas más fiables para elaborar un sistema coherente. Así las teorías principialistas son más deductivas, mientras que los procedimientos casuistas son más inductivos. Este artículo analiza las ventajas e inconvenientes de cada uno de estos sistemas, concluyendo que el coherentismo es el sistema más apropiado para responder a los interrogantes morales de la vida cotidiana. Finalmente se presenta un proyecto de investigación denominado "Red de Conciencia Virtual" que intenta aprovechar las experiencias y percepciones morales de un grupo de personas trabajando a distancia en internet, con el programa webct que facilita la Universidad Complutense de Madrid.
Towards a Proper Assignment of Systemic Risk: The Combined Roles of Network Topology and Shock Characteristics
Lasse Loepfe, Antonio Cabrales, Angel Sánchez
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0077526
Abstract: The 2007-2008 financial crisis solidified the consensus among policymakers that a macro-prudential approach to regulation and supervision should be adopted. The currently preferred policy option is the regulation of capital requirements, with the main focus on combating procyclicality and on identifying the banks that have a high systemic importance, those that are “too big to fail”. Here we argue that the concept of systemic risk should include the analysis of the system as a whole and we explore systematically the most important properties for policy purposes of networks topology on resistance to shocks. In a thorough study going from analytical models to empirical data, we show two sharp transitions from safe to risky regimes: 1) diversification becomes harmful with just a small fraction (~2%) of the shocks sampled from a fat tailed shock distributions and 2) when large shocks are present a critical link density exists where an effective giant cluster forms and most firms become vulnerable. This threshold depends on the network topology, especially on modularity. Firm size heterogeneity has important but diverse effects that are heavily dependent on shock characteristics. Similarly, degree heterogeneity increases vulnerability only when shocks are directed at the most connected firms. Furthermore, by studying the structure of the core of the transnational corporation network from real data, we show that its stability could be clearly increased by removing some of the links with highest centrality betweeness. Our results provide a novel insight and arguments for policy makers to focus surveillance on the connections between firms, in addition to capital requirements directed at the nodes.
An Acoustic Modem Featuring a Multi-Receiver and Ultra-Low Power  [PDF]
Antonio Sánchez, Sara Blanc, Pedro Yuste, Angel Perles, Juan José Serrano
Circuits and Systems (CS) , 2015, DOI: 10.4236/cs.2015.61001
Abstract: Wireless technology for underwater communication possesses a wide range of potential application, but it is still a relatively unexplored area in many aspects concerning modems physical design. A step towards future deployment of underwater networks is the reduction of power consumption. Therefore, asynchronous wakeup systems need to be integrated within the physical layer design while avoiding the use of additional transducers. This paper offers a practical and generic solution to adapt data reception and transmission together with asynchronous wakeup sub-systems in acoustic underwater modem architectures using a low power and low cost solution. The proposal has been implemented in a real prototype with success.
DC motion of ac driven sine-Gordon solitons
Niurka R. Quintero,Angel Sánchez
Physics , 1997, DOI: 10.1016/S0375-9601(98)00554-4
Abstract: We investigate the possibility of dc soliton motion sustained by pure ac driving in the sine-Gordon model. We show by means of the collective coordinate formalism that ac driving induces a net dc velocity whose modulus and direction depend on the driving phase. Numerical simulations of the full sine-Gordon equation confirm the correctness and accuracy of this prediction. Non trivial cases when dc soliton motion is transformed into oscillatory as well as the effects of damping are analyzed. Our results settle a long standing issue about the existence and characteristics of this phenomenon, whose possible appearance in other systems is also discussed.
A note on the existence of standard splittings for conformally stationary spacetimes
Miguel Angel Javaloyes,Miguel Sánchez
Physics , 2008, DOI: 10.1088/0264-9381/25/16/168001
Abstract: Let $(M,g)$ be a spacetime which admits a complete timelike conformal Killing vector field $K$. We prove that $(M,g)$ splits globally as a standard conformastationary spacetime with respect to $K$ if and only if $(M,g)$ is distinguishing (and, thus causally continuous). Causal but non-distinguishing spacetimes with complete stationary vector fields are also exhibited. For the proof, the recently solved "folk problems" on smoothability of time functions (moreover, the existence of a {\em temporal} function) are used.
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