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Search Results: 1 - 10 of 3418 matches for " Dennis Kremer "
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Social Network and Inter-Organizational Learning: The Case of a Brazilian Cooperative of Fish-Farmers  [PDF]
Andreia Maria Kremer, Edson Talamini
Social Networking (SN) , 2013, DOI: 10.4236/sn.2013.22010
Abstract: The inter-organizational learning approach has shown considerable growth in recent years. The concepts of trust and cooperation between individuals present in the New Economic Sociology (NES) approach of social relations emerge with great emphasis and are gaining prominence as a facilitator and propellant mechanism in transferring knowledge inside networks. This study aims to analyze the learning networks formed by fish-farmers organized into a cooperative to identify the characteristics of the network through structural analysis and identification of its critical actors. The study was performed with thirteen fish-farmers of a cooperative headquartered inMundo Novocounty, which is located inMato Grosso do Sulstate in the Midwest region of Brazil. Questionnaires and interviews with closed and open questions were used to collect the data. Measures of centrality (for individuals), density and reciprocity (in relations between individuals) were obtained from ORA software. The findings revealed that experience exchanges between fish-farmers, events participation, meetings attendance, speech audience and technical advice are the main forms of inter-organizational learning. Results suggest that the network has low levels of cohesion and that it is not taking advantage of its full potential. It was also found that there is a subgroup within the network that presents a high level of cohesion and shared learning based on cooperative informal relationships. Grounded in findings, suggestions for future research are presented.
Contact Geometry of Hyperbolic Equations of Generic Type
Dennis The
Symmetry, Integrability and Geometry : Methods and Applications , 2008,
Abstract: We study the contact geometry of scalar second order hyperbolic equations in the plane of generic type. Following a derivation of parametrized contact-invariants to distinguish Monge-Ampère (class 6-6), Goursat (class 6-7) and generic (class 7-7) hyperbolic equations, we use Cartan's equivalence method to study the generic case. An intriguing feature of this class of equations is that every generic hyperbolic equation admits at most a nine-dimensional contact symmetry algebra. The nine-dimensional bound is sharp: normal forms for the contact-equivalence classes of these maximally symmetric generic hyperbolic equations are derived and explicit symmetry algebras are presented. Moreover, these maximally symmetric equations are Darboux integrable. An enumeration of several submaximally symmetric (eight and seven-dimensional) generic hyperbolic structures is also given.
Invariant Yang-Mills connections over Non-Reductive Pseudo-Riemannian Homogeneous Spaces
Dennis The
Physics , 2007, DOI: 10.1090/S0002-9947-09-04797-7
Abstract: We study invariant gauge fields over the 4-dimensional non-reductive pseudo-Riemannian homogeneous spaces G/K recently classified by Fels & Renner (2006). Given H compact semi-simple, classification results are obtained for principal H-bundles over G/K admitting: (1) a G-action (by bundle automorphisms) projecting to left multiplication on the base, and (2) at least one G-invariant connection. There are two cases which admit nontrivial examples of such bundles and all G-invariant connections on these bundles are Yang-Mills. The validity of the principle of symmetric criticality (PSC) is investigated in the context of the bundle of connections and is shown to fail for all but one of the Fels-Renner cases. This failure arises from degeneracy of the scalar product on pseudo-tensorial forms restricted to the space of symmetric variations of an invariant connection. In the exceptional case where PSC is valid, there is a unique G-invariant connection which is moreover universal, i.e. it is the solution of the Euler-Lagrange equations associated to any G-invariant Lagrangian on the bundle of connections. This solution is a canonical connection associated with a weaker notion of reductivity which we introduce.
Contact Geometry of Hyperbolic Equations of Generic Type
Dennis The
Mathematics , 2008, DOI: 10.3842/SIGMA.2008.058
Abstract: We study the contact geometry of scalar second order hyperbolic equations in the plane of generic type. Following a derivation of parametrized contact-invariants to distinguish Monge-Ampere (class 6-6), Goursat (class 6-7) and generic (class 7-7) hyperbolic equations, we use Cartan's equivalence method to study the generic case. An intriguing feature of this class of equations is that every generic hyperbolic equation admits at most a nine-dimensional contact symmetry algebra. The nine-dimensional bound is sharp: normal forms for the contact-equivalence classes of these maximally symmetric generic hyperbolic equations are derived and explicit symmetry algebras are presented. Moreover, these maximally symmetric equations are Darboux integrable. An enumeration of several submaximally symmetric (eight and seven-dimensional) generic hyperbolic structures is also given.
Conformal geometry of surfaces in the Lagrangian--Grassmannian and second order PDE
Dennis The
Mathematics , 2010, DOI: 10.1112/plms/pdr023
Abstract: Of all real Lagrangian--Grassmannians $LG(n,2n)$, only $LG(2,4)$ admits a distinguished (Lorentzian) conformal structure and hence is identified with the indefinite M\"obius space $S^{1,2}$. Using Cartan's method of moving frames, we study hyperbolic (timelike) surfaces in $LG(2,4)$ modulo the conformal symplectic group $CSp(4,R)$. This $CSp(4,R)$-invariant classification is also a contact-invariant classification of (in general, highly non-linear) second order scalar hyperbolic PDE in the plane. Via $LG(2,4)$, we give a simple geometric argument for the invariance of the general hyperbolic Monge--Amp\`ere equation and the relative invariants which characterize it. For hyperbolic PDE of non-Monge--Amp\`ere type, we demonstrate the existence of a geometrically associated ``conjugate'' PDE. Finally, we give the first known example of a Dupin cyclide in a Lorentzian space.
?A qué llamamos salud y enfermedad mental en pediatría?: una mirada reflexiva sobre los diagnósticos psiquiátricos y su relación con nuevas teorías de subjetivación en el ni?o
Kremer,Irene;
Archivos argentinos de pediatr?-a , 2011, DOI: 10.5546/aap.2011.412
Abstract: conceptual basis for infant and juvenile psychiatry are discussed taking into account the clear differences in the definition of health and mental illness. it is emphasized that the mind is not simply a biological phenomenon and, thus, there is a need for assessment parameters that include subjective states, as well as a shift from lineal thoughts to complex forms that include the value of experience, fate, and event, amongst other ideas. this allows a change of perspective: the acknowledgement of the positive indicators of mental health and not only the absence of symptoms or disorders.
Polymer dynamics: long time simulations and topological constraints
Kremer, Kurt;
Brazilian Journal of Physics , 2006, DOI: 10.1590/S0103-97332006000500007
Abstract: topological constraints, entanglements, dominate the viscoelastic behavior of high molecular weight polymeric liquids. to give a microscopic foundation of the phenomenological tube, recently a method for identifying the so called primitive path mesh that characterizes the microscopic topological state of (computer generated) conformations of long-chain polymer networks, melts and solutions was introduced. here we give a short account of this approach and compare this to long time simulations.
Los límites de la cosa juzgada en el Derecho de la Unión Europea
Kremer,Carsten;
Revista de derecho (Valparaíso) , 2010, DOI: 10.4067/S0718-68512010000200006
Abstract: this article aims at answering the question whether there is, and if so, to what extent, a limitation to the res iudicata of the national decisions of the member states of the european union. for this, certain important rulings, dating back to the past years, handed down by the court of justice of the european union will be reviewed.
Rorty and Normativity
Alexander Kremer
Human Affairs , 2007, DOI: 10.2478/v10023-007-0007-8
Abstract: The paper summarizes some of the main ideas in Rorty's philosophy and indicates the views he holds on normativity. As a neopragmatic thinker, Rorty wants as little normativity as possible, but this does not mean that he rejects all types of normativity.
Rorty on Science and Politics
Alexander Kremer
Human Affairs , 2009, DOI: 10.2478/v10023-009-0022-z
Abstract: In my paper I will prove my overall thesis that Rorty consistently enforces his politically saturated liberal ironic standpoint in the fields of science and politics from his "Contingency" book (1989). As a neopragmatist thinker he gives priority to politics in the sense of a liberal democracy over everything else. Even philosophy as "cultural politics" serves this purpose. He did not want to create a detailed political philosophy, but the main motive of his philosophy is political. He is charged with complacency, relativism and misinterpreting traditional pragmatism, but I show that this is mistaken. Rorty offers "only" a non-systematic, but logical and permanently developed interpretation of our present world on the basis of knowledge he appropriated and improved by building bridges between pragmatism, analytic and continental philosophy. I will analyze briefly in the first part his neo-pragmatist thoughts on science in connection with his political views. In the second part I will interpret Rorty as a liberal ironist who regards almost everything as contingent, except democracy. He outlines a liberal utopia that means first of all a just society in a Rawlsian sense, but he also develops his idea further in a neo-pragmatic way.
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