A Monte Carlo method for accelerating the computation of animated radiosity sequences

Realistic rendering animation is known to be an expensive processing task when physically-based global illumination methods are used in order to improve illumination details. This paper presents an acceleration technique to compute animations in radiosity environments. The technique is based on an interpolated approach that exploits temporal coherence in radiosity. A fast global Monte Carlo pre-processing step is introduced to the whole computation of the animated sequence to select important frames. These are fully computed and used as a base for the interpolation of all the sequence. The approach is completely view-independent. Once the illumination is computed, it can be visualized by any animated camera. Results present significant high speed-ups showing that the technique could be an interesting alternative to deterministic methods for computing non-interactive radiosity animations for moderately complex scenarios

"Sóc" a la professió infermera

El propòsit de la present investigació és conèixer el model Salutogènic i la seva aplicació en el treball diari dels professionals d’infermeria. La disciplina infermera es caracteritza pel tracte amb les persones, el seu paradigma està basat en les cures cap a aquestes. Aquest fet causa que formin part de la professió els estímuls estressants tant de l’ambient com de l’interior dels professionals i és important que aquests prenguin consciència d’aquesta realitat i desenvolupin recursos i mecanismes que possibilitin realitzar les cures de gran qualitat. Creiem que el model Salutogènic i el seu constructe principal, el Sentit de Coherència ens col·loquen en bon camí per poder aprofundir en aquest tema. (Extret de la introducció)

Funcions densitat i semblança molecular quàntica: nous desenvolupaments i aplicacions

La present tesi, tot i que emmarcada dins de la teoria de les Mesures Semblança Molecular Quántica (MQSM), es deriva en tres àmbits clarament definits: - La creació de Contorns Moleculars de IsoDensitat Electrònica (MIDCOs, de l'anglès Molecular IsoDensity COntours) a partir de densitats electròniques ajustades. - El desenvolupament d'un mètode de sobreposició molecular, alternatiu a la regla de la màxima semblança. - Relacions Quantitatives Estructura-Activitat (QSAR, de l'anglès Quantitative Structure-Activity Relationships). L'objectiu en el camp dels MIDCOs és l'aplicació de funcions densitat ajustades, ideades inicialment per a abaratir els càlculs de MQSM, per a l'obtenció de MIDCOs. Així, es realitza un estudi gràfic comparatiu entre diferents funcions densitat ajustades a diferents bases amb densitats obtingudes de càlculs duts a terme a nivells ab initio. D'aquesta manera, l'analogia visual entre les funcions ajustades i les ab initio obtinguda en el ventall de representacions de densitat obtingudes, i juntament amb els valors de les mesures de semblança obtinguts prèviament, totalment comparables, fonamenta l'ús d'aquestes funcions ajustades. Més enllà del propòsit inicial, es van realitzar dos estudis complementaris a la simple representació de densitats, i són l'anàlisi de curvatura i l'extensió a macromolècules. La primera observació correspon a comprovar no només la semblança dels MIDCOs, sinó la coherència del seu comportament a nivell de curvatura, podent-se així observar punts d'inflexió en la representació de densitats i veure gràficament aquelles zones on la densitat és còncava o convexa. Aquest primer estudi revela que tant les densitats ajustades com les calculades a nivell ab initio es comporten de manera totalment anàloga. En la segona part d'aquest treball es va poder estendre el mètode a molècules més grans, de fins uns 2500 àtoms. Finalment, s'aplica part de la filosofia del MEDLA. Sabent que la densitat electrònica decau ràpidament al allunyar-se dels nuclis, el càlcul d'aquesta pot ser obviat a distàncies grans d'aquests. D'aquesta manera es va proposar particionar l'espai, i calcular tan sols les funcions ajustades de cada àtom tan sols en una regió petita, envoltant l'àtom en qüestió. Duent a terme aquest procés, es disminueix el temps de càlcul i el procés esdevé lineal amb nombre d'àtoms presents en la molècula tractada. En el tema dedicat a la sobreposició molecular es tracta la creació d'un algorisme, així com la seva implementació en forma de programa, batejat Topo-Geometrical Superposition Algorithm (TGSA), d'un mètode que proporcionés aquells alineaments que coincideixen amb la intuïció química. El resultat és un programa informàtic, codificat en Fortran 90, el qual alinea les molècules per parelles considerant tan sols nombres i distàncies atòmiques. La total absència de paràmetres teòrics permet desenvolupar un mètode de sobreposició molecular general, que proporcioni una sobreposició intuïtiva, i també de forma rellevant, de manera ràpida i amb poca intervenció de l'usuari. L'ús màxim del TGSA s'ha dedicat a calcular semblances per al seu ús posterior en QSAR, les quals majoritàriament no corresponen al valor que s'obtindria d'emprar la regla de la màxima semblança, sobretot si hi ha àtoms pesats en joc. Finalment, en l'últim tema, dedicat a la Semblança Quàntica en el marc del QSAR, es tracten tres aspectes diferents: - Ús de matrius de semblança. Aquí intervé l'anomenada matriu de semblança, calculada a partir de les semblances per parelles d'entre un conjunt de molècules. Aquesta matriu és emprada posteriorment, degudament tractada, com a font de descriptors moleculars per a estudis QSAR. Dins d'aquest àmbit s'han fet diversos estudis de correlació d'interès farmacològic, toxicològic, així com de diverses propietats físiques. - Aplicació de l'energia d'interacció electró-electró, assimilat com a una forma d'autosemblança. Aquesta modesta contribució consisteix breument en prendre el valor d'aquesta magnitud, i per analogia amb la notació de l'autosemblança molecular quàntica, assimilar-la com a cas particular de d'aquesta mesura. Aquesta energia d'interacció s'obté fàcilment a partir de programari mecanoquàntic, i esdevé ideal per a fer un primer estudi preliminar de correlació, on s'utilitza aquesta magnitud com a únic descriptor. - Càlcul d'autosemblances, on la densitat ha estat modificada per a augmentar el paper d'un substituent. Treballs previs amb densitats de fragments, tot i donar molt bons resultats, manquen de cert rigor conceptual en aïllar un fragment, suposadament responsable de l'activitat molecular, de la totalitat de l'estructura molecular, tot i que les densitats associades a aquest fragment ja difereixen degut a pertànyer a esquelets amb diferents substitucions. Un procediment per a omplir aquest buit que deixa la simple separació del fragment, considerant així la totalitat de la molècula (calcular-ne l'autosemblança), però evitant al mateix temps valors d'autosemblança no desitjats provocats per àtoms pesats, és l'ús de densitats de Forats de fermi, els quals es troben definits al voltant del fragment d'interès. Aquest procediment modifica la densitat de manera que es troba majoritàriament concentrada a la regió d'interès, però alhora permet obtenir una funció densitat, la qual es comporta matemàticament igual que la densitat electrònica regular, podent-se així incorporar dins del marc de la semblança molecular. Les autosemblances calculades amb aquesta metodologia han portat a bones correlacions amb àcids aromàtics substituïts, podent així donar una explicació al seu comportament. Des d'un altre punt de vista, també s'han fet contribucions conceptuals. S'ha implementat una nova mesura de semblança, la d'energia cinètica, la qual consisteix en prendre la recentment desenvolupada funció densitat d'energia cinètica, la qual al comportar-se matemàticament igual a les densitats electròniques regulars, s'ha incorporat en el marc de la semblança. A partir d'aquesta mesura s'han obtingut models QSAR satisfactoris per diferents conjunts moleculars. Dins de l'aspecte del tractament de les matrius de semblança s'ha implementat l'anomenada transformació estocàstica com a alternativa a l'ús de l'índex Carbó. Aquesta transformació de la matriu de semblança permet obtenir una nova matriu no simètrica, la qual pot ser posteriorment tractada per a construir models QSAR.

Reencantar a educação : a educação básica e a ressocialização dos presos

Esta dissertação teve como objetivo descrever a educação básica no contexto do sistema penitenciário de Salvador em termos de processos educacionais e da Proposta Político-Pedagógica (PPP) com vistas à ressocialização do preso. Especificamente: a) descrever a realidade educacional do sistema penitenciário; b) analisar o processo educacional, método em termos de restauração pessoal, quanto à ressocialização do apenado. Em termos de percurso metodológico, quanto à natureza da pesquisa, trata-se de um estudo qualitativo. Organizou-se a dissertação, dando-lhe coerência e direção. A fundamentação teórica foi organizada delimitando-se os pontos essenciais da investigação. Em termos de tipo de pesquisa qualitativa, trata-se de estudo de caso, o qual vai-se valer, em termos de coleta de dados, da observação, entrevistas, narrativas e análise de documentos. Há que se observar que se torna difícil a situação de reintegração social do regresso, principalmente no tocante à sua recolocação profissional, pois vive-se hoje a realidade de um desemprego generalizado com elevado contingente de trabalhadores desempregados, e que ainda na maioria das vezes ainda contam com experiência profissional. A situação torna-se difícil para uma pessoa que traz consigo o estigma de ex-presidiário, e que na maioria das vezes não tem qualquer qualificação profissional. A „recuperação‟ do preso passa pela manutenção de sua referência com o mundo exterior, tais como a família, o meio de trabalho, o bairro onde reside. Quanto mais essas referências forem afastadas (e o são), mais difícil será sua readaptação posterior à sociedade. Pode ser que, após um longo período, adaptado pelas forças de sua instituição total, o mesmo já não consiga se adaptar a uma sociedade livre.

Museums as service providers

The present paper discusses the complex understanding of Museum as an entity that provides services. Indeed we are far from seeing museums fully acting as services since the rationale of the way they operate derives from the permanent concession of grants either from state budgets or from beneficent institutions. In order to do this, we use reflections presented in previous papers, where we considered these issues separately; we now believe they will gain some coherence when articulated with the reflection on museums seen in their possible, albeit inadequately assumed, condition as service providers.We shall consider some aspects of the introduction in museums of the new information and communication technologies (NICT) as part of this process. On the one hand, these technologies open doors, and some museums take good advantage of that; but on the other hand their being used in a limited way does not enable the realisation of the role they can play, with multiple benefits from the organisational point of view, fostering innovation and creating new service concepts that are more aware of the world we live in.

Teoría de la interpretación y legitimidad del Tribunal Constitucional (Tema Central)

En este artículo se reflexiona acerca de la posibilidad de establecer la existencia, en la actividad hermenéutica de los Tribunales Constitucionales, de unas directrices o guías interpretativas que una vez especificadas puedan ser utilizadas como parámetro para controlar la juridicidad de la reconducción de la vida constitucional efectiva a las reglas de la Constitución. Todo ello pasando, en primer lugar, por el estudio de dos problemáticas: el papel de la jurisprudencia en el sistema de fuentes y los criterios de interpretación como instrumentos aptos para impedir o facilitar que dicha jurisprudencia pueda ser considerada fuente del Derecho, y, en segundo lugar, de los diferentes instrumentos hermenéuticos que se configuran como enlace entre disposición y norma y sus resultados interpretativos. Todo para llegar a demostrar que la utilización de los diferentes criterios de interpretación no puede ser evaluada por medio de un parámetro externo, como el de la teoría dogmática de la interpretación, sino que ellos se controlan por sí mismos, es decir, que el único control posible es un control de coherencia de su aplicación.

Manuela, la impensable: un diálogo entre Amor y gloria: el romance de Manuela Sáenz y el Libertador Simón Bolívar (1952), de María Jesús Alvarado, y Manuela Sáenz, la divina loca (195?), de Olga Briceño (Estudios)

En este artículo se analiza el diálogo que establecen las intelectuales latinoamericanas con la Historia oficial por medio de determinadas ficciones de archivo publicadas en la década de 1950. Al respecto, es importante tener en cuenta que tras la adquisición de derechos civiles por parte de las mujeres latinoamericanas en las décadas de 1930 y 1940 –cuando conquistaron el derecho al voto, ingresaron masivamente a las universidades y se erigieron como posibles representantes de los intereses públicos–, las intelectuales del continente demandaron la adscripción a alguna genealogía histórica que les proporcionara coherencia y profundidad identitaria. En muchas ocasiones debieron echar mano del discurso literario para negociar su existencia presente con el pasado histórico y ampliar los límites de la fundación continental con la visibilización de las voces y subjetividades femeninas. En este marco se publican los dos libros que componen el corpus: Manuela Sáenz, la divina loca (195?), de la venezolana Olga Briceño, y Amor y gloria: el romance de Manuela Sáenz y el Libertador Simón Bolívar (1952), de la peruana María Jesús Alvarado. Estas lecturas permitirán reflexionar en torno al proceso de historización de la alteridad demandado por las nuevas ciudadanas del continente, determinar sus alcances y la subjetividad resultante de este enfrentamiento.

The UK-Canada Agreement on mutual support of missions abroad: loyalty compromised? CEPS Commentary, 18 October 2012

The UK and Canada recently signed a Memorandum of Understanding aimed at allowing the two countries to optimise their respective diplomatic resources by sharing embassy and consulate sites, the joint acquisition, supply and use of services, as well as collaboration on crisis response, consular services, security, diplomatic mail, information management and IT. This CEPS Commentary argues that the MoU on Mutual Support of Missions Abroad runs counter to the spirit of loyal cooperation, in particular in the realm of EU foreign policy. It also raises challenges to coherence, consistency and effectiveness of EU action in policy areas concerning visas, trade and consular protection. Moreover, the agreement may throw a spanner in the works of EU solidarity and the creation of a stronger EU identity, both internally and externally

Which economic model for a water-efficient Europe? Report of a CEPS Task Force. CEPS Task Force Report, 27 November 2012

This CEPS Task Force Report focuses on how to improve water efficiency in Europe, notably in public supply, households, agriculture, energy and manufacturing as well as across sectors. It presents a number of recommendations on how to make better use of economic policy instruments to sustainably manage the EU’s water resources. Published in the run-up to the European Commission’s “Blueprint to Safeguard Europe’s Waters”, the report contributes to the policy deliberations in two ways. First, by assessing the viability of economic policy instruments, it addresses a major shortcoming that has so far prevented the 2000 EU Water Framework Directive (WFD) from becoming fully effective in practice: the lack of appropriate, coherent and effective instruments in (some) member states. Second, as the Task Force report is the result of an interactive process involving a variety of stakeholders, it is able to point to the key differences in interpreting and applying WFD principles that have led to a lack of policy coherence across the EU and to offer some pragmatic advice on moving forward.

A comparison of recent reanalysis datasets using objective feature tracking: Storm tracks and tropical easterly waves

Data from four recent reanalysis projects [ECMWF, NCEP-NCAR, NCEP - Department of Energy ( DOE), NASA] have been diagnosed at the scale of synoptic weather systems using an objective feature tracking method. The tracking statistics indicate that, overall, the reanalyses correspond very well in the Northern Hemisphere (NH) lower troposphere, although differences for the spatial distribution of mean intensities show that the ECMWF reanalysis is systematically stronger in the main storm track regions but weaker around major orographic features. A direct comparison of the track ensembles indicates a number of systems with a broad range of intensities that compare well among the reanalyses. In addition, a number of small-scale weak systems are found that have no correspondence among the reanalyses or that only correspond upon relaxing the matching criteria, indicating possible differences in location and/or temporal coherence. These are distributed throughout the storm tracks, particularly in the regions known for small-scale activity, such as secondary development regions and the Mediterranean. For the Southern Hemisphere (SH), agreement is found to be generally less consistent in the lower troposphere with significant differences in both track density and mean intensity. The systems that correspond between the various reanalyses are considerably reduced and those that do not match span a broad range of storm intensities. Relaxing the matching criteria indicates that there is a larger degree of uncertainty in both the location of systems and their intensities compared with the NH. At upper-tropospheric levels, significant differences in the level of activity occur between the ECMWF reanalysis and the other reanalyses in both the NH and SH winters. This occurs due to a lack of coherence in the apparent propagation of the systems in ERA15 and appears most acute above 500 hPa. This is probably due to the use of optimal interpolation data assimilation in ERA15. Also shown are results based on using the same techniques to diagnose the tropical easterly wave activity. Results indicate that the wave activity is sensitive not only to the resolution and assimilation methods used but also to the model formulation.

New perspectives on the Northern Hemisphere winter storm tracks

The aim of this paper is to explore the use of both an Eulerian and system-centered method of storm track diagnosis applied to a wide range of meteorological fields at multiple levels to provide a range of perspectives on the Northern Hemisphere winter transient motions and to give new insight into the storm track organization and behavior. The data used are primarily from the European Centre for Medium-Range Weather Forecasts reanalyses project extended with operational analyses to the period 1979-2000. This is supplemented by data from the National Centers for Environmental Prediction and Goddard Earth Observing System 1 reanalyses. The range of fields explored include the usual mean sea level pressure and the lower- and upper-tropospheric height, meridional wind, vorticity, and temperature, as well as the potential vorticity (PV) on a 330-K isentropic surface (PV330) and potential temperature on a PV = 2 PVU surface (theta(PV2)). As well as reporting the primary analysis based on feature tracking, the standard Eulerian 2-6-day bandpass filtered variance analysis is also reported and contrasted with the tracking diagnostics. To enable the feature points to be identified as extrema for all the chosen fields, a planetary wave background structure is removed at each data time. The bandpass filtered variance derived from the different fields yield a rich picture of the nature and comparative magnitudes of the North Pacific and Atlantic storm tracks, and of the Siberian and Mediterranean candidates for storm tracks. The feature tracking allows the cyclonic and anticyclonic activities to be considered seperately. The analysis indicates that anticyclonic features are generally much weaker with less coherence than the cyclonic systems. Cyclones and features associated with them are shown to have much greater coherence and give tracking diagnostics that create a vivid storm track picture that includes the aspects highlighted by the variances as well as highlighting aspects that are not readily available from Eulerian studies. In particular, the upper-tropospheric features as shown by negative theta(PV2), for example, occur in a band spiraling around the hemisphere from the subtropical North Atlantic eastward to the high latitudes of the same ocean basin. Lower-troposphere storm tracks occupy more limited longitudinal sectors, with many of the individual storms possibly triggered from the upper-tropospheric disturbances in the spiral band of activity.

Can the frequency of blocking be described by a red noise process?

The frequency of persistent atmospheric blocking events in the 40-yr ECMWF Re-Analysis (ERA-40) is compared with the blocking frequency produced by a simple first-order Markov model designed to predict the time evolution of a blocking index [defined by the meridional contrast of potential temperature on the 2-PVU surface (1 PVU ≡ 1 × 10−6 K m2 kg−1 s−1)]. With the observed spatial coherence built into the model, it is able to reproduce the main regions of blocking occurrence and the frequencies of sector blocking very well. This underlines the importance of the climatological background flow in determining the locations of high blocking occurrence as being the regions where the mean midlatitude meridional potential vorticity (PV) gradient is weak. However, when only persistent blocking episodes are considered, the model is unable to simulate the observed frequencies. It is proposed that this persistence beyond that given by a red noise model is due to the self-sustaining nature of the blocking phenomenon.

Fidelity in interpretation: Lord Hoffmann and the adventure of the empty house

This paper explores Dworkin's 'law as a chain novel' analogy and considers the recent work of Dworkin and MacCormick through close scrutiny of two recent judgments of Lord Hoffmann, in Barlow Clowes v Eurotrust International [2005] UKPC 37 and Barker v Corus [2006] UKHL 20. The aim is to examine Dworkin's theory in the context of recent English private law decisions and determine whether Lord Hoffmann's approach to interpretation is consistent with that of Dworkin (as his Lordship has contended in the past). It is argued that Lord Hoffmann's treatment of recent decisions on which he himself sat raises significant questions regarding fidelity, coherence and the institutional structure of the House of Lords.

Development of a method fon non-destructive testing of fruits using scanning laser vibrometry (SLV)

Quality control on fruits requires reliable methods, able to assess with reasonable accuracy and possibly in a non-destructive way their physical and chemical characteristics. More specifically, a decreased firmness indicates the presence of damage or defects in the fruit or else that the fruit has exceeded its “best before date”, becoming unsuitable for consumption. In high-value exotic fruits, such as mangoes, where firmness cannot be easily measured from a simple observation of texture, colour changes and unevenness of fruits surface, the use of non-destructive techniques is highly recommendable. In particular, the application of Laser vibrometry, based on the Doppler effect, a non-contact technique sensitive to differences in displacements inferior to the nanometre, appears ideal for a possible on-line control on food. Previous results indicated that a phase shift can be in a repeatable way associated with the presence of damage on the fruit, whilst a decreased firmness results in significant differences in the displacement of the fruits under the same excitation signal. In this work, frequency ranges for quality control via the application of a sound chirp are suggested, based on the measurement of the signal coherence. The variations of the average vibration spectrum of a grid of points, or of point-by-point signal velocity allows the go-no go recognition of “firm” and “over-ripe” fruits, with notable success in the particular case of mangoes. The future exploitation of this work will include the application of this method to allow on-line control during conveyor belt distribution of fruits.