123,039 research outputs found
Agenda Control in Coalition Formation
No full textTheoretical models of government formation in political science usually assume that the head of state is non-strategic. In this paper, we analyze the power of an agenda setter who chooses the order in which players are recognized to form coalitions in simple games. We characterize those sets of players which can be imposed in the equilibrium coalition and show that the only decisive structures where the agenda setter can impose the presence of any minimal winning coalition are apex games, where a large player forms a winning coalition with any of the small players.Agenda Control; Cabinet Formation; Simple Games
Experimental investigation into the effect of substrate clamping on the piezoelectric behaviour of thick-film PZT elements
No full textThis paper details an experimental investigation of the clamping effect associated with thick-film piezoelectric elements printed on a substrate. The clamping effect reduces the measured piezoelectric coefficient, d33, of the film. This reduction is due to the influence of the d31 component in the film when a deformation of the structure occurs, by either the direct or indirect piezoelectric effect. Theoretical analysis shows a reduction in the measured d33 of 62%, i.e. a standard bulk lead zirconate titanate (PZT)-5H sample with a manufacturer specified d33 of 593pC/N would fall to 227.8pC/N. To confirm this effect, the d33 coefficients of five thin bulk PZT-5H samples of 220µm thickness were measured before and after their attachment to a metallized 96% alumina substrate. The experimental results show a reduction in d33 of 74% from 529pC/N to 139pC/N. The theoretical analysis was then applied to existing University of Southampton thick-film devices. It is estimated that the measured d33 value of 131pC/N of the thick-film devices is the equivalent of an unconstrained d33 of 345pC/N
Trust-based interactions in teams of mobile agents
No full textThis paper introduces a trust model that couples the change in performance in a team of agents to how the agents perceive (or trust) each other. This combination of social dynamics and physical update laws not only changes the performance of the system, but it has the potential to make it deteriorate in a dramatic fashion. In fact, in the two-agent case, it is shown that the system exhibits finite escape time through an invariance result that carries over also to larger systems and more elaborate trust models. The invariance result states that an increase in performance must be accompanied by an increase in the total trust in the network (and vice versa for deteriorating performance). Finally, the connection is made between the proposed model and the belief and group polarization phenomena encountered in group processes driven by social interaction dynamics
Optimizing the Performance of Electrostrictive Ceramics
No full textLCSetter, N Israel Armament Dev Author,Pob 2250,Haifa,Israel Amp74 Times Cited:1 Cited References Count:
Low voltage ferroelectric FET with sub-l00nm copolymer P(VDF-TrFE) gate dielectric for non-volatile IT memory
No full textA polymer based Ferroelectric gate FET at IT nonvolatile memory on bulk silicon is demonstrated. Spin-coated 40nm and lOOnm P(VDF-TrFE) (70%-30%) ultra-thin films have been integrated onto lOnm Si02 layer as gate dielectric into a conventional silicon n-MOSFETs. A IT non-volatile memory cell with an operating voltage as low as 6V, for the thinnest (40nm) gate ferroelectric copolymer dielectric, is demonstrated for the first time. The reported Fe-FET devices have Ion/Ioff ranging from 105 to 10 6 and retention time up to few days. Experiments show reliable memory operation up to 105 cycles and programming time in the order of ms.© 2008 IEEE
1T memory cell based on PVDF-TrFE field effect transistor
No full textInterest in vinylidene fluoride (VDF) co-polymer with trifluorethylene (TrFE) P(VDF-TrFE) as ferroelectric material for memory application is driven by the prospect of having low cost and low operating voltage devices integrated on silicon and, at long term, migrate on flexible substrates. Some previous studies reported FET design using copolymers [1-8] but none of these structures were fully integrated on silicon wafers into a quasi-standard MOSFET fabrication process. We present for the first time the integration of a P(VDF-TrFE) (70%-30%) layer into a standard n-MOS transistor gate stack through a conventional semiconductor technology. This allows us to achieve a one-transistor (IT) Non Volatile Memory (NVM) cell. The operation voltage required for the 100nm organic ferroelectric thickness is less than 12V and a retention time ranging from few hours to few days is reported. © 2008 Materials Research Society
Topological Quantum Field Theory and the Geometric Langlands Correspondence
No full textIn the pioneering work of A. Kapustin and E. Witten, the geometric Langlands program of number theory was shown to be intimately related to duality of GL-twisted N=4 super Yang-Mills theory compactified on a Riemann surface. In this thesis, we generalize Kapustin-Witten by investigating compactification of the GL-twisted theory to three dimensions on a circle (for various values of the twisting parameter t). By considering boundary conditions in the three-dimensional description, we classify codimension-two surface operators of the GL-twisted theory, generalizing those surface operators studied by S. Gukov and E. Witten. For t=i, we propose a complete description of the 2-category of surface operators in terms of module categories, and, in addition, we determine the monoidal category of line operators which includes Wilson lines as special objects. For t=1 and t=0, we discuss surface and line operators in the abelian case.
We generalize Kapustin-Witten also by analyzing a separate twisted version of N=4, the Vafa-Witten theory. After introducing a new four-dimensional topological gauge theory, the gauged 4d A-model, we locate the Vafa-Witten theory as a special case. Compactification of the Vafa-Witten theory on a circle and on a Riemann surface is discussed. Several novel two- and three-dimensional topological gauge theories are studied throughout the thesis and in the appendices.
In work unrelated to the main thread of the thesis, we conclude by classifying codimension-one topological defects in two-dimensional sigma models with various amounts of supersymmetry.</p
Diseño e implementación de modelo de evaluación de desempeño de recurso humano en Publiservic
No full textProyecto para optar al tÃtulo de Ingeniero en Administración con mención en Recursos HumanosRecursos Humanos es una gestión que se ocupa de seleccionar, contratar, formar, emplear y retener a los colaboradores de la organización. El recurso humano poco a poco está adquiriendo mayor relevancia dentro de las empresas, si bien siempre se han necesitado para llevar a cabo las distintas actividades dentro de la organización para poder lograr sus propósitos, no siempre los trabajadores fueron considerados como un factor fundamental dentro de las organizaciones. Hoy en dÃa, las personas son consideradas como el recurso más importante dentro de una empresa, los trabajadores son percibidos como el pilar fundamental dentro de una organización, lo que a esta le permite funcionar de manera integral y eficiente. Los trabajadores agregan un valor a las compañÃas, por lo que es necesario brindarles oportunidades y herramientas que les permitan desarrollarse de tal manera que ellos se sientan necesarios e importantes para la institución en que se desempeñan. Actualmente se sabe que el éxito o fracaso que pueda tener una organización está en función directa por sus trabajadores, es decir todo depende en como ellos se desempeñan y si son o no capaces de generar valor a la empresa a la cual pertenecen. El recurso humano pretende alinear los objetivos de las personas con los de la empresa organizándolos de tal manera que ambos puedan desarrollarse persiguiendo una meta en común, los trabajadores al ser considerados como recurso vivo e inteligente son el
componente esencial para que una empresa pueda realizar sus funciones de manera integral. Una vez que el recurso humano es reconocido como un componente fundamental en las organizaciones, existe la necesidad de saber cómo se están desempeñando en sus labores. Las empresas necesitan un modelo de evaluación de desempeño que entregue resultados confiables, que el sistema sea efectivo, que sea una herramienta al servicio de toda la organización y que elimine por sobre todo la subjetividad, realizando asà evaluaciones con mediciones cuantitativas. Una de las razones por las cuales las empresas deben implementar un sistema de evaluación del desempeño, es para saber si sus trabajadores están contribuyendo al logro de los objetivos o no. Esta investigación desarrolla una propuesta del Proyecto Aplicado de Titulación, el cual está determinado por un diseño y aplicación de un modelo de evaluación de desempeño para los trabajadores de la empresa Publiservic, con el objetivo de poder recompensar el desempeño que estos pudiesen tener al realizar sus labores dentro de la organización, identificar los aspectos a trabajar en ellos y asà poder mejorar el estándar de calidad de la empresa en cuestión. Este modelo de evaluación de desempeño, elimina al cien por ciento la subjetividad de la evaluación, ya que los indicadores a medir y evaluar para cada trabajador son cuantitativos, lo que permite que esta evaluación sea cuantitativa, objetiva y racional. Publiservic no cuenta con una evaluación de desempeño formal, por lo tanto, no existe un registro respecto a la calidad de la actividad que desarrolla o que ha desarrollado cada uno de los trabajadores, es por esta razón que no están establecidas polÃticas de retribución o de incentivo en relación al desempeño, como tampoco existen capacitaciones, para que los trabajadores puedan mejorar su rendimiento. Este proyecto pretende entregar valor a la organización e incidir positivamente en el desempeño de los trabajadores, a conocer el potencial que tiene la empresa con su talento humano, como también estar en conocimiento de las debilidades que estos tienen y poder superarlas de una u otra manera
A Multi-Language Comparison of Influences on Author Verification using Character N-Grams
No full textWe create a new multi-language corpus for author verification based on Wikipedia talkpages, and evaluate the influence that differences in topic and time have on character n-gram author profiles. Topic alignment between two texts is found to increase author verification precision, and an authors writing style is found to change over time, but not more significantly after 3 years than after 1 year.Information ArchitectureWISElectrical Engineering, Mathematics and Computer Scienc
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