Fund Finder: A case study of database-to-ontology mapping

The mapping between databases and ontologies is a basic problem when trying to "upgrade" deep web content to the semantic web. Our approach suggests the declarative definition of mappings as a way to achieve domain independency and reusability. A specific language (expressive enough to cover some real world mapping situations like lightly structured databases or not 1st normal form ones) is defined for this purpose. Along with this mapping description language, the ODEMapster processor is in charge of carrying out the effective instance data migration. We illustrate this by testing both the mappings definition and processor on a case study

R2O, an extensible and semantically based database-to-ontology mapping language

We present R2O, an extensible and declarative language to describe mappings between relational DB schemas and ontologies implemented in RDF(S) or OWL. R2O provides an extensible set of primitives with welldefined semantics. This language has been conceived expressive enough to cope with complex mapping cases arisen from situations of low similarity between the ontology and the DB models

Non-extensive radiobiology

The expression of survival factors for radiation damaged cells is based on probabilistic assumptions and experimentally fitted for each tumor, radiation and conditions. Here we show how the simplest of these radiobiological models can be derived from the maximum entropy principle of the classical Boltzmann-Gibbs expression. We extend this derivation using the Tsallis entropy and a cutoff hypothesis, motivated by clinical observations. A generalization of the exponential, the logarithm and the product to a non-extensive framework, provides a simple formula for the survival fraction corresponding to the application of several radiation doses on a living tissue. The obtained expression shows a remarkable agreement with the experimental data found in the literature, also providing a new interpretation of some of the parameters introduced anew. It is also shown how the presented formalism may has direct application in radiotherapy treatment optimization through the definition of the potential effect difference, simply calculated between the tumour and the surrounding tissue.Comment: 8 pages, 1 figure. Sent to MaxEnt 2010. To be submitted for publicatio

Integrable systems with BMS3_{3} Poisson structure and the dynamics of locally flat spacetimes

We construct a hierarchy of integrable systems whose Poisson structure corresponds to the BMS$_{3}$ algebra, and then discuss its description in terms of the Riemannian geometry of locally flat spacetimes in three dimensions. The analysis is performed in terms of two-dimensional gauge fields for $isl(2,R)$. Although the algebra is not semisimple, the formulation can be carried out \`a la Drinfeld-Sokolov because it admits a nondegenerate invariant bilinear metric. The hierarchy turns out to be bi-Hamiltonian, labeled by a nonnegative integer $k$, and defined through a suitable generalization of the Gelfand-Dikii polynomials. The symmetries of the hierarchy are explicitly found. For $k\geq 1$, the corresponding conserved charges span an infinite-dimensional Abelian algebra without central extensions, and they are in involution; while in the case of $k=0$, they generate the BMS$_{3}$ algebra. In the special case of $k=1$, by virtue of a suitable field redefinition and time scaling, the field equations are shown to be equivalent to a specific type of the Hirota-Satsuma coupled KdV systems. For $k\geq 1$, the hierarchy also includes the so-called perturbed KdV equations as a particular case. A wide class of analytic solutions is also explicitly constructed for a generic value of $k$. Remarkably, the dynamics can be fully geometrized so as to describe the evolution of spacelike surfaces embedded in locally flat spacetimes. Indeed, General Relativity in 3D can be endowed with a suitable set of boundary conditions, so that the Einstein equations precisely reduce to the ones of the hierarchy aforementioned. The symmetries of the integrable systems then arise as diffeomorphisms that preserve the asymptotic form of the spacetime metric, and therefore, they become Noetherian. The infinite set of conserved charges is recovered from the corresponding surface integrals in the canonical approach.Comment: 34 pages, 2 figure

Evaluación de la distribución del Gasto Público en un marco Post-Keynesiano para una economía abierta

Un creciente peso económico de los gobiernos a lo largo del mundo junto con una relación negativa entre los niveles de gasto público y el ritmo de crecimiento, abren el interrogante sobre cuál debe ser el papel óptimo del Estado. Desde una óptica postkeynesiana se explora la posibilidad de que la distribución que realice el gobierno de su gasto pueda explicar esta relación negativa al generar dinámicas insostenibles en el largo plazo o que aun pareciendo positivas puedan estar reduciendo el potencial futuro dado un efecto negativo sobre la acumulación de capital físico y humano. Así, para eliminar el efecto negativo de la intervención estatal, bastaría con reestructurar el gasto público, privilegiando aquellas partidas que afecten de forma positiva la productividad al tiempo que generan demanda efectiva en el corto plazo. / Abstract. A heavy economic growth of the governments throughout the world goes hand in hand with a negative relationship between the standard of public spending and the growth rate, raising the question what the ideal role of the state is. From the post-Keynesian point of view the possibility has to be investigated that governments budget spending could explain this negative relationship by generating a long term unsustainable dynamic or even though it appears positive it could be reducing the future potential therefore resulting in a negative effect over the accumulation of physical and human capital. Thus, to eliminate the negative effect of state intervention, it would be sufficient to restructure public spending, favoring those parties that affect in a positive way productivity while generating demand effectively short term.Maestrí

CMOS SPADs selection, modeling and characterization towards image sensors implementation

The selection, modeling and characterization of Single Photon Avalanche Diodes (SPADs) are presented. Working with the standard 180nm UMC CMOS process, different SPAD structures are proposed in combination with several quenching circuits in order to compare their relative performances. Various configurations for the active region and the prevention of the premature edge breakdown are tested, looking for a miniaturization of the devices to implement image sensor arrays without loses in their performance

Financiamiento especulativo de la vivienda en Colombia: un análisis de la dinámica de los precios, 2000-2016

This paper studies the dynamics of housing prices in Colombia from 2000 to 2016. The non-conventional theoretical foundations for price determination are presented, along with two quantitative strategies: 1) a descriptive study of the market and the possible financial fragility that has allowed the increase in prices of new housing; and 2) a VEC econometric model that captures the short and long term price determinants. The paper concludes that the dynamics of housing prices is influenced by mortgage loans and construction costs, and has a strong long-term relationship between current and previous behavior of prices, made evident in speculative financial scenarios.O presente trabalho estuda a dinâmica dos preços da moradia na Colômbia no período de 2000 a 2016. Apresentam-se os fundamentos teóricos não convencionais para a determinação do preço, juntamente com duas estratégias quantitativas: 1) um estudo descritivo do mercado e da possível fragilidade financeira que permitiu o aumento dos preços de imóveis novos, e 2) um modelo econométrico VEC que captura os determinantes de curto e longo prazo do preço. Conclui-se que a dinâmica do preço da moradia é influenciada pelo crédito hipotecário e pelos custos de construção, além de apresentar uma forte relação de longo prazo entre o comportamento atual e prévio dos preços, evidentes nos cenários financeiros especulativos.El presente trabajo estudia la dinámica de los precios de la vivienda en Colombia para el periodo 2000 a 2016. Se presentan los fundamentos teóricos no-convencionales para la determinación del precio, junto con dos estrategias cuantitativas: 1) un estudio descriptivo del mercado y la posible fragilidad financiera que ha permitido el incremento de los precios de la vivienda nueva; y 2) un modelo econométrico VEC que captura los determinantes de corto y largo plazo del precio. Se concluye que la dinámica del precio de la vivienda está influenciada por el crédito hipotecario y los costos de construcción, y presenta una fuerte relación de largo plazo entre el comportamiento actual y previo de los precios, evidentes en los escenarios financieros especulativos

Paisaje de Cañas Lo Figueroa. La armonía entre el paisaje natural y el construido

43 p