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Search Results: 1 - 10 of 33310 matches for " Daniel Muriel "
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RESE A CRíTICA: LIZCANO, EMMáNUEL (2006). METáFORAS QUE NOS PIENSAN. SOBRE CIENCIA, DEMOCRACIA Y OTRAS PODEROSAS FICCIONES. MADRID: TRAFICANTES DE SUE OS; EDICIONES BAJO CERO
Daniel Muriel
Papeles del CEIC , 2007,
Abstract:
Estados hipermnésicos en la cultura de la memoria y la inflación patrimonializadora: algunos apuntes en torno a la labor experta sobre la memoria de la Guerra Civil Espa ola
Daniel Muriel
Papeles del CEIC , 2010,
Abstract: El presente texto pretende ser la presentación de una hipótesis de trabajo a desarrollar en un contexto social en el que se entrecruzan, por un lado, la constante problematización de las identidades personales y colectivas y, por otro lado, una creciente preocupación por la construcción de relatos y constitución de prácticas relativas a la conservación de elementos —materiales y simbólicos— en riesgo dedesaparecer. Tomando ese punto de partida, la hipótesis buscaría postularse como una respuesta plausible a la siguiente pregunta: es posible desarrollar mecanismos de construcción de identidad y de conservación después de situaciones catastróficas desde un punto de vista social (guerras, dictaduras, catástrofes naturales, atentados)? La hipótesis que aquí se plantea a modo de apuntes viene a contestarafirmativamente: sí es posible generar o reconstruir estrategias de sentido tras la catástrofe o el trauma social pero ni en su totalidad (la representación y la reparación siempre serán parciales) ni en lascondiciones en las que lo hacía con anterioridad a la catástrofe (participación de otros agentes y procesos, como aquellos que son considerados expertos). / In this text I shall introduce a working hypothesis within a social context in which are intertwined the following issues: on the one hand, the constant problematizationof personal and collective identities; on the other,an increasing preoccupation for the composition of accounts and the constitution of practices as regards the conservation of elements in risk of disappearing. From this starting point, the hypothesis would seek, ina plausible way, to answer this interrogation: is it possible to develop mechanisms of identity construction and preservation after, from a social point of view, catastrophic situations (wars, dictatorships, natural catastrophes, terrorist attacks)? The hypothesis presented as a set of reflections comes to respond in anaffirmative way: it is possible to produce or reconstruct meaning strategies after social trauma or catastrophe but neither in its totality (the representation and the reparation will always be partial) nor under the circumstances in which it was used to do it before the catastrophe (other agents and processes participate like, for instance, those considered as experts).
Performing Sociology Through Actor-Network Theory: From Impressionist Cartography to the Dirtiness of Mediations Hacer sociología a través de la teoría del actor-red: de la cartografía impresionista a la suciedad de las mediaciones
Daniel Muriel
Athenea Digital , 2011,
Abstract: In this paper I try to outline the existence of certain problems I have found during my research work, within sociology discipline, when it comes to follow some of the main threads of the complex fabric that constitutes the Actor-Network Theory (ANT). In the same way, I suggest some possible subterfuges to go around those problems. Two are the problems and two are the subterfuges as well destined to tackle them. On the one hand, I face the problem of the magnitude and fidelity that ANT's descriptions demand, thoroughly detailed and local, which clashes with the requirements of sociological theory that seeks abstractions and regularities. The subterfuge I propose is the one called "impressionist cartography". On the other hand, I bump into the difficulty of the irreversibility of mediations and the sanitized representations carried out, sometimes, by ANT. In order to fight this, I use the subterfuge oriented to adopt the premise of the "inevitable dirtiness of mediations". En este artículo intento proponer un esbozo de ciertos problemas que me he encontrado en el transcurro de mi investigación, dentro de la disciplina de la sociología, cuando he intentado seguir algunas de las principales tramas del complejo entramado de la teoría del actor-red (ANT), así como de los subterfugios que planteo para bordearlos. Dos son los problemas y dos los posibles subterfugios para abordarlos. Por un lado, me encuentro con el problema de la envergadura y fidelidad de las descripciones que exige la ANT, muy localizadas y minuciosas, que choca con los requerimientos de la teoría sociológica que busca regularidades y abstracciones. El subterfugio que planteo es el de la "cartografía impresionista". Por otro lado, me topo con la dificultad de la irreversibilidad de las mediaciones y las higienizantes representaciones que lleva a cabo en ocasiones la ANT. Para combatir esto, utilizo el subterfugio de adoptar la premisa de la "inevitable suciedad de las mediaciones".
Manejos de realidad y sus condiciones de (im)posibilidad: tres vías hacia la sociedad del conocimiento Handling reality: three paths to understanding the knowledge society
Daniel Muriel
Athenea Digital , 2009,
Abstract: En este texto planteo diversas modos de caracterizar la sociedad del conocimiento, entendida como una hipótesis, un punto de partida, que puede ayudarnos a entender la realidad social contemporánea tras la crisis de la modernidad que es visible a partir de la segunda mitad del siglo XX. Para ello, coloco en el centro de la discusión el concepto manejos de realidad, definido como todas esas prácticas semiótico-materiales por las que se intenta influir de alguna manera sobre el mundo que nos rodea, centrándome, a nivel epistemológico, en aquellos manejos de realidad de gran envergadura: las prácticas científico-políticas. De estas reflexiones iniciales extraigo tres caminos concretos que nos pueden llevar a la materialización (o no) de la hipótesis sociedad del conocimiento, ninguno de ellos excluyente, al contrario, solapándose en muchos puntos: las vía sociológico-moderna, la articulatorio-actancial y la genealógica. The "knowledge society" hypothesis is a useful heuristic for understanding contemporary society after the crisis of modernity that arose in the second half of the 20th century. I shall examine the ways in which reality can be handled (reality handlings), that is, all those material-semiotic practices through which we try to influence the world that surrounds us. I shall focus especially on the epistemological problems of current scientific and political practices. I conclude with three specific, but not mutually exclusive avenues that might (or might not) help us fully articulate the idea of the "knowledge society": the modern-sociological, the actantial-articulative, and the genealogical.
(In)transitabilidades hacia la sociedad del conocimiento: una lectura crítica de la producción sociológica moderna
Muriel, Daniel
CONfines de relaciones internacionales y ciencia política , 2005,
Abstract: Este artículo pretende realizar una aproximación al concepto de sociedad del conocimiento e intenta sortear los riesgos que implica hacerlo desde una concepción modernista de la sociología. Se hará un repaso, entonces, por las distintas formas con las que la sociología a intentado nominar el cambio de época desde el inicio de la segunda mitad del siglo XX. Finalmente, todos los esfuerzos irán dirigidos a advertir al lector sobre los peligros que encierra seguir la vía sociológico-moderna para llegar a una sociedad del conocimiento plausible, como herramienta conceptual que nos ayude a pensar determinadas problemáticas contemporáneas. *** The purpose of this article is to develop an approximation of the concept of a society of knowledge while trying to avoid the risks that this implies when using a modernist perspective of sociology. The author reviews the different major phases of change described by modern sociologists since the second half of the 20th century. The article provides a critical review of modern sociological thought in relation to a plausible formulation of a knowledgable society as a conceptual tool that helps us to understand certain contemporary problems.
Mechanisms of pressure-diuresis and pressure-natriuresis in Dahl salt-resistant and Dahl salt-sensitive rats
Daniel A Beard, Muriel Mescam
BMC Physiology , 2012, DOI: 10.1186/1472-6793-12-6
Abstract: The mechanism of pressure-diuresis and pressure-natriuresis that emerges from simulation of the integrated systems is that relatively small increases in glomerular filtration that follow from increases in renal arterial pressure cause relatively large increases in urine and sodium output. Furthermore, analysis reveals the minimal differences between the experimental cases necessary to explain the observed data. It is determined that differences in renal afferent and efferent arterial resistances are able to explain all of the qualitative differences in observed flows, filtration rates, and glomerular pressure as well as the differences in the pressure-natriuresis and pressure-diuresis relationships in the three groups. The model is able to satisfactorily explain data from all three groups without varying parameters associated with glomerular filtration or solute transport in the nephron component of the model.Thus the differences between the experimental groups are explained solely in terms of difference in blood flow regulation. This finding is consistent with the hypothesis that, if a shift in the pressure-natriuresis relationship is the primary cause of elevated arterial pressure in the Dahl S rat, then alternation in how renal afferent and efferent arterial resistances are regulated represents the primary cause of chronic hypertension in the Dahl S rat.Animal models of salt- and/or angiotensin II-induced chronic hypertension have revealed shifts in the observed pressure-natriuresis and pressure-diuresis relationships to higher pressures, as well as altered renal blood flow regulation [1-6]. The salt-sensitive Dahl S (SS) rat is a widely studied example of an animal that develops hypertension, associated with a shift of the pressure-natriuresis relationship (relationship between sodium excretion and arterial pressure) to higher pressures, when fed a high-salt diet. When maintained on high salt (e.g., 8% NaCl in chow) the kidneys of these animals are found to excr
Whether and Where to Code in the Wireless Relay Channel
Xiaomeng Shi,Muriel Medard,Daniel E. Lucani
Computer Science , 2011,
Abstract: The throughput benefits of random linear network codes have been studied extensively for wirelined and wireless erasure networks. It is often assumed that all nodes within a network perform coding operations. In energy-constrained systems, however, coding subgraphs should be chosen to control the number of coding nodes while maintaining throughput. In this paper, we explore the strategic use of network coding in the wireless packet erasure relay channel according to both throughput and energy metrics. In the relay channel, a single source communicates to a single sink through the aid of a half-duplex relay. The fluid flow model is used to describe the case where both the source and the relay are coding, and Markov chain models are proposed to describe packet evolution if only the source or only the relay is coding. In addition to transmission energy, we take into account coding and reception energies. We show that coding at the relay alone while operating in a rateless fashion is neither throughput nor energy efficient. Given a set of system parameters, our analysis determines the optimal amount of time the relay should participate in the transmission, and where coding should be performed.
When Both Transmitting and Receiving Energies Matter: An Application of Network Coding in Wireless Body Area Networks
Xiaomeng Shi,Muriel Medard,Daniel Lucani
Computer Science , 2010,
Abstract: A network coding scheme for practical implementations of wireless body area networks is presented, with the objective of providing reliability under low-energy constraints. We propose a simple network layer protocol for star networks, adapting redundancy based on both transmission and reception energies for data and control packets, as well as channel conditions. Our numerical results show that even for small networks, the amount of energy reduction achievable can range from 29% to 87%, as the receiving energy per control packet increases from equal to much larger than the transmitting energy per data packet. The achievable gains increase as a) more nodes are added to the network, and/or b) the channels seen by different sensor nodes become more asymmetric.
On the Relationship between Transmission Power and Capacity of an Underwater Acoustic Communication Channel
Daniel E. Lucani,Milica Stojanovic,Muriel Médard
Mathematics , 2008,
Abstract: The underwater acoustic channel is characterized by a path loss that depends not only on the transmission distance, but also on the signal frequency. As a consequence, transmission bandwidth depends on the transmission distance, a feature that distinguishes an underwater acoustic system from a terrestrial radio system. The exact relationship between power, transmission band, distance and capacity for the Gaussian noise scenario is a complicated one. This work provides a closed-form approximate model for 1) power consumption, 2) band-edge frequency and 3) bandwidth as functions of distance and capacity required for a data link. This approximate model is obtained by numerical evaluation of analytical results which takes into account physical models of acoustic propagation loss and ambient noise. The closed-form approximations may become useful tools in the design and analysis of underwater acoustic networks.
Random Linear Network Coding For Time Division Duplexing: Energy Analysis
Daniel E. Lucani,Milica Stojanovic,Muriel Médard
Mathematics , 2009,
Abstract: We study the energy performance of random linear network coding for time division duplexing channels. We assume a packet erasure channel with nodes that cannot transmit and receive information simultaneously. The sender transmits coded data packets back-to-back before stopping to wait for the receiver to acknowledge the number of degrees of freedom, if any, that are required to decode correctly the information. Our analysis shows that, in terms of mean energy consumed, there is an optimal number of coded data packets to send before stopping to listen. This number depends on the energy needed to transmit each coded packet and the acknowledgment (ACK), probabilities of packet and ACK erasure, and the number of degrees of freedom that the receiver requires to decode the data. We show that its energy performance is superior to that of a full-duplex system. We also study the performance of our scheme when the number of coded packets is chosen to minimize the mean time to complete transmission as in [1]. Energy performance under this optimization criterion is found to be close to optimal, thus providing a good trade-off between energy and time required to complete transmissions.
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