428 research outputs found
Segmentation of bone structures in 3D CT images based on continuous max- ow optimization
In this paper an algorithm to carry out the automatic segmentation of bone structures in 3D CT images
has been implemented. Automatic segmentation of bone structures is of special interest for radiologists and
surgeons to analyze bone diseases or to plan some surgical interventions. This task is very complicated as bones
usually present intensities overlapping with those of surrounding tissues. This overlapping is mainly due to the
composition of bones and to the presence of some diseases such as Osteoarthritis, Osteoporosis, etc. Moreover,
segmentation of bone structures is a very time-consuming task due to the 3D essence of the bones. Usually,
this segmentation is implemented manually or with algorithms using simple techniques such as thresholding and
thus providing bad results. In this paper gray information and 3D statistical information have been combined
to be used as input to a continuous max-
ow algorithm. Twenty CT images have been tested and di erent
coe cients have been computed to assess the performance of our implementation. Dice and Sensitivity values
above 0.91 and 0.97 respectively were obtained. A comparison with Level Sets and thresholding techniques has
been carried out and our results outperformed them in terms of accuracy.Ministerio de ciencia e innovación TEC2010-21619-C04-02Junta de Andalucía P11-TIC-772
SRec, software de animación de la recursividad
SRec es una aplicación que permite la generación automatizada de animaciones de programas basados en la recursividad. Ofrece una gran variedad de facilidades educativas como cargar y guardar animaciones ya generadas, configuración de la información que se muestra en cada momento y una interfaz muy intuitiva. Mitiga el esfuerzo de elaboración de animaciones para los profesores y ayuda a analizar los algoritmos recursivos a los alumnos. Los resultados obtenidos de su utilización en las clases indican una gran aceptación por parte de los alumnos y una mejora en sus evaluaciones académicas.Peer Reviewe
Strategies for Microbial Decontamination of Fresh Blueberries and Derived Products
Increasing consumption of blueberries is associated with appreciation of their organoleptic properties together with their multiple health benefits. The increasing number of outbreaks caused by pathogenic microorganisms associated with their consumption in the fresh state and the rapid spoilage of this product which is mainly caused by moulds, has led to the development and evaluation of alternatives that help mitigate this problem. This article presents different strategies ranging from chemical, physical and biological technologies to combined methods applied for microbial decontamination of fresh blueberries and derived products. Sanitizers such as peracetic acid (PAA), ozone (O3), and electrolyzed water (EOW), and physical technologies such as pulsed light (PL) and cold plasma (CP) are potential alternatives to the use of traditional chlorine. Likewise, high hydrostatic pressure (HHP) or pulsed electrical fields (PEF) successfully achieve microbial reductions in derivative products. A combination of methods at moderate intensities or levels is a promising strategy to increase microbial decontamination with a minimal impact on product quality
Microbiological criteria: Principles for their establishment and application in food quality and safety
Legislation on food safety has led
towards the standardization of food productions
which, together with the existing quality
certifications, aim to increase the level
of protection of public health. It is recognized
the need for the agri-food industry to
have tools to harmonize their productions
and to adequately manage their quality systems
in order to improve consumers’ confidence.
The implementation of microbiological
criteria is focused on facilitating this
harmonization by enabling the discrimination
of defective lots and acting as control
tools at industrial level. Therefore, knowledge
of the principles, components and factors
influencing the efficiency of microbiological
criteria may be helpful to better
understand the consequences of their application.
In the present study the main principles,
methodologies and applications of
microbiological criteria in foods are
addressed for their implementation as a part
of the management quality systems of agrifood
industries. In addition, potential limitations
and impact of microbiological criteria
on food safety are discussed. Finally, an
assessment of the performance of microbiological
criteria at EU level in berries is
described for the compliance of the socalled
risk-based metrics, namely
Performance Objectives and Food Safety
Objectives
How Bees Respond Differently to Field Margins of Shrubby and Herbaceous Plants in Intensive Agricultural Crops of the Mediterranean Area
(1) Intensive agriculture has a high impact on pollinating insects, and conservation strategies targeting agricultural landscapes may greatly contribute to their maintenance. The aim of this work was to quantify the effect that the vegetation of crop margins, with either herbaceous or shrubby plants, had on the abundance and diversity of bees in comparison to non-restored margins. (2) The work was carried out in an area of intensive agriculture in southern Spain. Bees were monitored visually and using pan traps, and floral resources were quantified in crop margins for two years. (3) An increase in the abundance and diversity of wild bees in restored margins was registered, compared to non-restored margins. Significant differences in the structure of bee communities were found between shrubby and herbaceous margins. Apis mellifera and mining bees were found to be more polylectic than wild Apidae and Megachilidae. The abundance of A. mellifera and mining bees was correlated to the total floral resources, in particular, to those offered by the Boraginaceae and Brassicaceae; wild Apidae and Megachilidae were associated with the Lamiaceae. (4) This work emphasises the importance of floral diversity and shrubby plants for the maintenance of rich bee communities in Mediterranean agricultural landscapes
Reorganización de las prácticas de compiladores para mejorar el aprendizaje de los estudiantes
La parte práctica de asignaturas como
Compiladores o Procesadores de Lenguajes (las
trataremos como la misma en el resto de la
comunicación) suele ser bastante costosa, ya que requiere cierto grado de planificación y
continuidad en el trabajo de los estudiantes y las herramientas utilizadas no tienen una conexión clara con los fundamentos teóricos. Nuestra propuesta estructura estas sesiones prácticas en tres tipos: las que se encargan de enlazar teoría y práctica, las que introducen a los estudiantes las herramientas de generación de compiladores y la final donde se desarrolla un compilador de cierta complejidad. Con este enfoque hemos mejorado el porcentaje de éxito en la parte práctica hasta un 86%.Peer Reviewe
SeaClouds: An Open Reference Architecture for Multi-Cloud Governance
A. Brogi, J. Carrasco, J. Cubo, F. D'Andria, E. Di Nitto, M. Guerriero, D. Pérez, E. Pimentel, J. Soldani. "SeaClouds: An Open Reference Architecture for Multi-Cloud Governance". In B. Tekinerdogan et al. (Eds.): ECSA 2016, LNCS 9839, pp. 334–338, 2016.We present the open reference architecture of the SeaClouds solution. It aims at enabling a seamless adaptive multi-cloud management of complex applications by supporting the distribution, monitoring and reconfiguration of app modules over heterogeneous cloud providers.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech
Adaptive Vectorial Filter for Grid Synchronization of Power Converters Under Unbalanced and/or Distorted Grid Conditions
This paper presents a new synchronization scheme for detecting multiple positive-/negative-sequence frequency harmonics in three-phase systems for grid-connected power converters. The proposed technique is called MAVF-FLL because it is based on the use of multiple adaptive vectorial filters (AVFs) working together inside a harmonic decoupling network, resting on a frequency-locked loop (FLL) which makes the system frequency adaptive. The method uses the vectorial properties of the three-phase input signal in the αβ reference frame in order to obtain the different harmonic components. The MAVF-FLL is fully designed and analyzed, addressing the tuning procedure in order to obtain the desired and predefined performance. The proposed algorithm is evaluated by both simulation and experimental results, demonstrating its ability to perform as required for detecting different harmonic components under a highly unbalanced and distorted input grid voltage
Enseñanza de Anatomía de Superficie Mediante la Pintura Corporal
The present project on learning surface anatomy through the body painting method was undertaken because
anatomical knowledge supports medical practice. The appropriate anatomical training of the doctor depends on surface anatomy. We
considered the renovation of teaching strategies and didactic resources to optimize the overall teaching- learning process. 189 first-year
medical students, enrolled in the Trunk and Splanchnology course at the University of Cádiz (Spain) participated in this study. Students
were divided into 5 groups each of 38-41 students. The students were asked to complete a satisfaction questionnaire supplied to each
participant through an on-line platform. On the basis of the results, we recommend the body painting method as an alternative tool for
learning surface and clinical anatomy
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