Juan Gomez Campos | Universidade de São Paulo (original) (raw)

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Papers by Juan Gomez Campos

PLOS ONE

Measuring event concentration often involves identifying clusters of events at various scales of ... more Measuring event concentration often involves identifying clusters of events at various scales of resolution and across different regions. In the context of a city, for example, clusters may be characterized by the proximity of events in the metric space. However, events may also occur over urban structures such as public transportation and infrastructure systems, which are naturally represented as networks. Our work provides a theoretical framework to determine whether events distributed over a set of interconnected nodes are concentrated on a particular subset. Our main analysis shows how the proposed or any other measure of event concentration on a network must explicitly take into account its degree distribution. We apply the framework to measure event concentration (i) on a street network (i.e., approximated as a regular network where events represent criminal activities); and (ii) on a social network (i.e., a power law network where events represent users who are dissatisfied a...

Universitas Psychologica

Desde la Teoría de Acción Planeada (TAP), el objetivo de este trabajo es analizar si la autoefica... more Desde la Teoría de Acción Planeada (TAP), el objetivo de este trabajo es analizar si la autoeficacia y la percepción de control presentan diferencias predictivas sobre la intención y las conductas preventivas de la enfermedad cardiovascular. La muestra estuvo compuesta por 359 sujetos. Los datos han sido analizados empleando el paquete estadístico EQS 6.1. Los resultados muestran que la autoeficacia influye positiva y significativamente sobre la intención y sobre la conducta, mientras que la percepción de control influye negativa y significativamente sobre la intención de conducta, pero no sobre la conducta preventiva. Este trabajo ha mostrado la conveniencia de distinguir entre autoeficacia y percepción de control en la TAP en la prevención de conductas de salud cardiovascular.

Applied Sciences

We present in this paper a revision of three different methods we conceived in the framework of l... more We present in this paper a revision of three different methods we conceived in the framework of liquid crystal on silicon (LCoS) display optimization and application. We preliminarily demonstrate an LCoS self-calibration technique, from which we can perform a complete LCoS characterization. In particular, two important characteristics of LCoS displays are retrieved by using self-addressed digital holograms. On the one hand, we determine its phase-voltage curve by using the interference pattern generated by a digital two-sectorial split-lens configuration. On the other hand, the LCoS surface profile is also determined by using a self-addressed dynamic micro-lens array pattern. Second, the implementation of microparticle manipulation through optical traps created by an LCoS display is demonstrated. Finally, an LCoS display based inline (IL) holographic imaging system is described. By using the LCoS display to implement a double-sideband filter configuration, this inline architecture d...

Ciències: revista del professorat de ciències de Primària i Secundària

El darrer Nobel de física ha premiat els treball de tres científics que han obert el camí a les c... more El darrer Nobel de física ha premiat els treball de tres científics que han obert el camí a les càmeres digitals i a la transmissió eficient de senyals digitals, la base de la xarxa.

Scientific reports, Jan 26, 2018

We present an experimental method, based on the use of dynamic split-lens configurations, useful ... more We present an experimental method, based on the use of dynamic split-lens configurations, useful for the trapping and spatial control of microparticles through the photophoretic force. In particular, the concept of split-lens configurations is exploited to experimentally create customized and reconfigurable three-dimensional light structures, in which carbon coated glass microspheres, with sizes in a range of 63-75 μm, can be captured. The generation of light spatial structures is performed by properly addressing phase distributions corresponding to different split-lens configurations onto a spatial light modulator (SLM). The use of an SLM allows a dynamic variation of the light structures geometry just by modifying few control parameters of easy physical interpretation. We provide some examples in video format of particle trapping processes. What is more, we also perform further spatial manipulation, by controlling the spatial position of the particles in the axial direction, demon...

Journal of biophotonics, Jan 5, 2017

We highlight the interest of using the Indices of Polarimetric Purity (IPPs) to the inspection of... more We highlight the interest of using the Indices of Polarimetric Purity (IPPs) to the inspection of biological tissues. The IPPs were recently proposed in the literature and they result in a further synthetization of the depolarizing properties of samples. Compared with standard polarimetric images of biological samples, IPPs based images lead to larger image contrast of some biological structures and to a further physical interpretation of the depolarizing mechanisms inherent to the samples. In addition, unlike other methods, their calculation do not require advanced algebraic operations (as is the case of polar decompositions), and they result in three indicators of easy implementation. We also propose a pseudo-coloured encoding of the IPPs information that leads to an improved visualization of samples. This last technique opens the possibility of tailored adjustment of tissues contrast by using customized pseudo-coloured images. The potential of the IPPs approach is experimentally ...

6th International Symposium on Electrets,(ISE 6) Proceedings.

Optics and the Information Age

ABSTRACT

Journal of biomedical optics, May 1, 2017

We present mathematical formulas generalizing polarization gating (PG) techniques. PG refers to a... more We present mathematical formulas generalizing polarization gating (PG) techniques. PG refers to a collection of imaging methods based on the combination of different controlled polarization channels. In particular, we show how using the measured Mueller matrix (MM) of a sample, a widespread number of PG configurations can be evaluated just from analytical expressions based on the MM coefficients. We also show the interest of controlling the helicity of the states of polarization used for PG-based metrology, as this parameter has an impact in the image contrast of samples. In addition, we highlight the interest of combining PG techniques with tools of data analysis related to the MM formalism, such as the well-known MM decompositions. The method discussed in this work is illustrated with the results of polarimetric measurements done on artificial phantoms and real ex-vivo tissues.

Alimentaria Revista De Tecnologia E Higiene De Los Alimentos, 2004

El Nuevo Derecho De La Persona Y De La Familia 2011 Isbn 978 84 9790 841 2 Pags 171 188, 2011

Cuadernos Civitas De Jurisprudencia Civil Vol 1 2009 Isbn 978 84 470 3363 8 Pags 621 627, 2009

Informacio Psicologica, Jun 10, 2013

nº 104 • juliol-desembre • pàgines 100-111 temes d'estudi LA RELEVANCIA DE LA INTELIGENCIA EMOCIO... more nº 104 • juliol-desembre • pàgines 100-111 temes d'estudi LA RELEVANCIA DE LA INTELIGENCIA EMOCIONAL EN LA PREVENCIÓN DEL CONSUMO DE ALCOHOL 100 temes d'estudi nº 104 • juliol-desembre • pàgines 100-111

Siwo Revista De Teologia, Aug 8, 2008

Querido niñito Dios, te quiero decir Que me he portado muy bien este año. Le he hecho caso a mis ... more Querido niñito Dios, te quiero decir Que me he portado muy bien este año. Le he hecho caso a mis papás, me he sacado buenas notas, He puesto atención en clase, no he peleado, He hecho mis tareas, he sido una buena persona Y por eso te quiero pedir los siguientes regalos… 1