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Search Results: 1 - 10 of 993 matches for " Gisela; Pollini "
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Resistencia a carbapenemes en aislamientos de Pseudomonas aeruginosa: un ejemplo de interacción entre distintos mecanismos
Santella,Gisela; Pollini,Simona; Docquier,Jean-Denis; Almuzara,Marisa; Gutkind,Gabriel; Rossolini,Gian Maria; Radice,Marcela;
Revista Panamericana de Salud Pública , 2011, DOI: 10.1590/S1020-49892011001200008
Abstract: objective: to identify the outer membrane protein absent in the resistant isolates and to determine both the causes of its absence in the membrane and the presence of other mechanisms of carbapenem resistance in clinical isolates of pseudomonas aeruginosa. methods: twenty isolates from an outbreak of p. aeruginosa previously characterized as metallo-beta-lactamase imp-13 producers were studied. all the isolates exhibited equal expression of the imp-13 enzyme, but only five of them were carbapenem-resistant. it was found that the five resistant isolates lacked a outer membrane protein. the oprd and ampc genes were sequenced; the outer membrane proteins were identified using matrix-assisted laser desorption/ionization time-of-flight (maldi-tof) mass spectrometry; the oprd and ampc expressions, as well as the mex efflux system, were assessed by real-time polymerase chain reaction; and finally, the contribution of reduced oprd to carbapenem resistance was determined. results: the absent outer membrane protein in group r was identified as oprd-ts; however, no variations in its expression were observed. the oprd gene presented mutations in the five resistant isolates. the production of ampc pdc-5-type enzyme and the mexab-oprm efflux system was the same in both carbapenem-sensitive and ?resistant isolates. the contribution of the combined presence of imp-13 and reduced oprd to increased resistance was examined. conclusions: different mechanisms contribute to carbapenem resistance in imp-13-producing isolates. the possibility that these imp-13-producing isolates could go undetected poses a latent risk when selecting mutants with added resistance mechanisms in order to enhance carbapenem resistance.
Cooperative Control for Multiple Autonomous Vehicles Using Descriptor Functions
Marta Niccolini,Lorenzo Pollini,Mario Innocenti
Journal of Sensor and Actuator Networks , 2014, DOI: 10.3390/jsan3010026
Abstract: The paper presents a novel methodology for the control management of a swarm of autonomous vehicles. The vehicles, or agents, may have different skills, and be employed for different missions. The methodology is based on the definition of descriptor functions that model the capabilities of the single agent and each task or mission. The swarm motion is controlled by minimizing a suitable norm of the error between agents’ descriptor functions and other descriptor functions which models the entire mission. The validity of the proposed technique is tested via numerical simulation, using different task assignment scenarios.
Social Learning and Rational-Emotive Education: An Exploratory Investigation of Students’ Perspective  [PDF]
Gisela Steins, Anna Haep
Psychology (PSYCH) , 2015, DOI: 10.4236/psych.2015.69107
Abstract: There is no doubt about the relevance of social learning from the perspective of many groups of adults, such as teachers and researchers. However, do students share this evaluation, especially if students are socially disadvantaged? The current study explored whether rational-emotive education (REE) was a suitable concept for social learning with disadvantaged students and what to consider when students’ perspective was involved. Mixed methods were used. Social problem solving was explored with a pre-post design in three groups (Social learning Treatment, Control, and Follow-Up: Social learning Treatment after one year) of 239 seventh and eighth graders. The attitudes of the students in the Treatment Group toward the usefulness of social learning played a crucial role in social problem solving. The reasons for the variance in students’ attitudes were subjected to a content analysis. A key finding was that students expected more entertainment and less formal education so that more effort was needed to motivate students at the beginning of a curriculum. In addition, most students appreciated the opportunity to learn a self-technology such as rational-emotive behavior therapy (REBT) as core element of REE.
SPIDER: Fault Resilient SDN Pipeline with Recovery Delay Guarantees
Carmelo Cascone,Luca Pollini,Davide Sanvito,Antonio Capone,Brunilde Sansò
Computer Science , 2015,
Abstract: When dealing with node or link failures in Software Defined Networking (SDN), the network capability to establish an alternative path depends on controller reachability and on the round trip times (RTTs) between controller and involved switches. Moreover, current SDN data plane abstractions for failure detection (e.g. OpenFlow "Fast-failover") do not allow programmers to tweak switches' detection mechanism, thus leaving SDN operators still relying on proprietary management interfaces (when available) to achieve guaranteed detection and recovery delays. We propose SPIDER, an OpenFlow-like pipeline design that provides i) a detection mechanism based on switches' periodic link probing and ii) fast reroute of traffic flows even in case of distant failures, regardless of controller availability. SPIDER can be implemented using stateful data plane abstractions such as OpenState or Open vSwitch, and it offers guaranteed short (i.e. ms) failure detection and recovery delays, with a configurable trade off between overhead and failover responsiveness. We present here the SPIDER pipeline design, behavioral model, and analysis on flow tables' memory impact. We also implemented and experimentally validated SPIDER using OpenState (an OpenFlow 1.3 extension for stateful packet processing), showing numerical results on its performance in terms of recovery latency and packet losses.
Traffic Management Applications for Stateful SDN Data Plane
Carmelo Cascone,Luca Pollini,Davide Sanvito,Antonio Capone
Computer Science , 2015,
Abstract: The successful OpenFlow approach to Software Defined Networking (SDN) allows network programmability through a central controller able to orchestrate a set of dumb switches. However, the simple match/action abstraction of OpenFlow switches constrains the evolution of the forwarding rules to be fully managed by the controller. This can be particularly limiting for a number of applications that are affected by the delay of the slow control path, like traffic management applications. Some recent proposals are pushing toward an evolution of the OpenFlow abstraction to enable the evolution of forwarding policies directly in the data plane based on state machines and local events. In this paper, we present two traffic management applications that exploit a stateful data plane and their prototype implementation based on OpenState, an OpenFlow evolution that we recently proposed.
Notas sobre la génesis fenomenológica del concepto levinasiano de diacronía
T?3picos , 2009,
Abstract: this work intends to give reason of the generic sense of levinas' notion of diachrony and of the influence of husserl's phenomenology of time in the construction of that category. first, we concentrate ourselves in the 1949 text, le temps et l'autre, in which lévinas introduces the figure of diachrony, and especially in his description of it as a time in which the relation with transcendence is fulfilled. the second thing we deal with more extensively, is the itinerary of the levinasian interpretation of husserl's on the phenomenology of the consciousness of internal time, in order to suggest certain existing connections between the critical interpretation of the husserlian notions of urimpression and of living present and the comprehension of diachronic time as a concrete event anchored in the subject's sensitive existence, which is anarchic as regards the present of representation.
Magallania (Punta Arenas) , 2010, DOI: 10.4067/S0718-22442010000100013
Abstract: the salitroso lake basin (santa cruz) is characterized by the existence of a great number of open air sites, both funerary structures and surface concentrations of archaeological materials. in this opportunity the information regarding the artefactual composition of these concentrations and the spaces between them is presented. the assemblages are located in dunes and the available chronologies date them after 1.600 years bp. the characteristics of artefactual diversity, types and raw materials are presented. technological variability is discussed by means of a techno-morphological and quantitative analysis. this variability is explained within the framework of the late holocene regional humidity drop. it is proposed that during this process the lake basin under study would have been used permanently and semi-permanently in a residential manner by hunter-gatherer groups (go?i 2000).
Los aspectos histórico-libidinales en los ni?os con dificultades atencionales
Anuario de investigaciones , 2006,
Abstract: this paper is based in the plan of doctoral thesis introduced by the author in the faculty of psychology, u.b.a, in the year 2005, whose title is: historic and libidinal aspects in boys and girls consulting because of their attentional disabilities. attentional disabilities, with or without hyperactivity, are described in the bibliography us the main clinical manifestations of the attention deficit disorder with or without hyperactivity ( t.d.a h in spanish - a.d.( h ) .d. in english ). in this research the attentional problems in kids are discussed from a wider perspective, meaning that before aiming at the deficit, this research develops the pre-requisites needed for the attention to arise as a function in a subject; this will allow to deepen on which are the necessary conditions that will make possible for a child to pay attention, thus making possible to help children suffering from these difficulties by deepening on some of the factors that are limiting them. the aim of this paper is to expose the theoretical framework that brings together this research and the methodology that is been used to carry it through. since this research is in progress, i will expound some partial conclusions.
La coordinación en Yukpa
Opción , 2007,
Abstract: this paper attempts to describe, from the typological perspective, the structure of coordination in yukpa, a venezuelan caribbean language spoken by approximately 4.000 people in the west of venezuela, specifically in the perija mountain range in zulia state. it is based on the definitions of sanders (1974), mallinson and blake (1981) and the typology of haspelmath (2000,2004). as supports to the study of the coordination in carribbean languages we also considered hall (1988), monsonyi & monsonyi (2000), gutiérrez (2001), chavier (2005) and sousa (2005); concerning the yukpa, vegamián (1978), obregón & armato (1986) and ni?o (1999). to obtain the proposed objective 80 sentences were reviewed as to conjunctive, disjunctive, adversative and causal coordinates. it was found that this language uses as conjunctive coordinators etet, etperat, eterat and the suffix -rat. the fns and the fvs unite by way of any of these elements; the clauses, on their part, prefer the suffix -rat. as disjunctive coordinators we have waipo -rat and vepo-rat and as causal coordinator ishi. the use of the particle -rat is a common strategy to express the conjunctive, disjunctive and adversative coordinates.
Hexágono versus árbol: casos atípicos en la organización del comercio informal en el Distrito Federal
Zaremberg, Gisela;
Perfiles latinoamericanos , 2010,
Abstract: this paper proposes to provide an explanation for a non-expected phenomenon: only three, of fifty organizations of informal merchants, have the opposite behavior than the others. while the overwhelming majority of those organizations are characterized by a monopolization of leadership, those three show a very horizontal structure. why are those three cases of informal organizations so different from the rest? why are those exceptional organizations headed by leaders that genuinely defend the interests of members, do not try to perpetuate their leadership, and carry out their activities with transparency and accountability? education, the presence of civil society and the construction of formal institutions that impact the distribution of power are the factors we look at in this paper.
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