Chaotic image encryption using hopfield and hindmarsh–rose neurons implemented on FPGA

Chaotic systems implemented by artificial neural networks are good candidates for data encryption. In this manner, this paper introduces the cryptographic application of the Hopfield and the Hindmarsh–Rose neurons. The contribution is focused on finding suitable coefficient values of the neurons to generate robust random binary sequences that can be used in image encryption. This task is performed by evaluating the bifurcation diagrams from which one chooses appropriate coefficient values of the mathematical models that produce high positive Lyapunov exponent and Kaplan–Yorke dimension values, which are computed using TISEAN. The randomness of both the Hopfield and the Hindmarsh–Rose neurons is evaluated from chaotic time series data by performing National Institute of Standard and Technology (NIST) tests. The implementation of both neurons is done using field-programmable gate arrays whose architectures are used to develop an encryption system for RGB images. The success of the encryption system is confirmed by performing correlation, histogram, variance, entropy, and Number of Pixel Change Rate (NPCR) tests

Unifying Self- and Other-Repair

Ginzburg J, Fernández R, Schlangen D. Unifying Self- and Other-Repair. In: Proceeding of DECALOG, the 11th International Workshop on the Semantics and Pragmatics of Dialogue (SemDial07). Trento, Italy; 2007

Dysfluencies as intra-utterance dialogue moves

Ginzburg J, Fernández R, Schlangen D. Dysfluencies as intra-utterance dialogue moves. Semantics and Pragmatics. 2014;7

Performance Analysis of 10,000 Residential PV Systems in France and Belgium

The main objective of this paper is to review the state of the art of residential PV systems in France and Belgium. This is done analyzing the operational data of 10650 PV systems (9657 located in France and 993 in Belgium). Three main questions are posed. How much energy do they produce? What level of performance is associated to their production? Which are the key parameters that most influence their quality? During the year 2010, the PV systems in France have produced a mean annual energy of 1163 kWh/kWp in France and 852 kWh/kWp in Belgium. As a whole, the orientation of PV generators causes energy productions to be some 7% inferior to optimally oriented PV systems. The mean Performance Ratio is 76% in France and 78% in Belgium, and the mean Performance Index is 85% in both countries. On average, the real power of the PV modules falls 4.9% below its corresponding nominal power announced on the manufacturer?s datasheet. A brief analysis by PV modules technology has lead to relevant observations about two technologies in particular. On the one hand, the PV systems equipped with Heterojunction with Intrinsic. Thin layer (HIT) modules show performances higher than average. On the other hand, the systems equipped with Copper Indium (di)Selenide (CIS) modules show a real power that is 16 % lower than their nominal value

Detección automática de fallos de operación en instalaciones fotovoltaicas domésticas

El objetivo principal de este trabajo es implementar una herramienta de análisis automático de datos de operación para detectar fallos en instalaciones fotovoltaicas domésticas que disponen de sistemas de monitorización. Para ello se han analizado los datos de productividad de 10.650 sistemas fotovoltaicos (9657 situados en Francia y 993 en Bélgica). El Performance Ratio (PR) promedio ha sido de 76% en Francia y 78% en Bélgica, y el Performance Index (PI) promedio es de 85% en ambos países. La potencia real media de los módulos fotovoltaicos es un 4,9% inferior a su valor nominal anunciado en la ficha técnica del fabricante. Los módulos de heterounión (HIT) muestran productividades superiores a la media, mientras que los módulos de Cobre-Indio-Selenio (CIS) muestran una potencia real un 16% inferior a su valor nominal

Review of the Performance of Residential PV systems in France

The main objective of this paper is to review the state of the art of residential PV systems in France. This is done analyzing the operational data of 6868 installations. Three main questions are posed. How much energy do they produce? What level of performance is associated to their production? Which are the key parameters that most influence their quality? During the year 2010, the PV systems in France have produced a mean annual energy of 1163 kWh/kWp. As a whole, the orientation of PV generators causes energy productions to be some 7% inferior to optimally oriented PV systems. The mean Performance Ratio is 76% and the mean Performance Index is 85%. That is to say, the energy produced by a typical PV system in France is 15% inferior to the energy produced by a very high quality PV system. On average, the real power of the PV modules falls 4.9% below its corresponding nominal power announced on the manufacturer's datasheet. A brief analysis by PV modules technology has led to relevant observations about two technologies in particular. On the one hand, the PV systems equipped with heterojunction with intrinsic thin layer (HIT) modules show performances higher than average. On the other hand, the systems equipped with the copper indium (di)selenide (CIS) modules show a real power that is 16% lower than their nominal value

Scarface’s excess: Style and Latino stereotypes.

El cine de Hollywood del pasado suele estar vinculado a una representación de la realidad cargada de estereotipos. Este tipo de representación está presente en películas de Hollywood de los ochenta pertenecientes a todos los géneros. Siendo uno de estos géneros el cine de gánsteres. El objetivo de esta disertación es explicar cómo la película de gánsteres Scarface es un ejemplo de los estereotipos raciales del cine de Hollywood de esta época. Concretamente, en esta disertación se analizan algunos elementos fílmicos de la película con el propósito de establecer una relación entre dicha película y la representación de los latinoamericanos como un grupo homogéneo, basándose únicamente en su etnia.Para demostrar la tesis de que Scarface es una demostración de los estereotipos raciales sobre los inmigrantes latinoamericanos, se ha realizado un análisis de esta película. Los elementos de la película que han sido analizados son el estilo visual, la puesta en escena, el sonido y las interpretaciones. Esta disertación se centra en ejemplos y aspectos concretos de estos elementos que son relevantes a la hora de demostrar la tesis. Los resultados de este análisis muestran que en esta película el vestuario, el escenario, la decoración, el estilo, el poder y las muertes contribuyen a reforzar estos clichés.Este análisis sugiere que lo que a primera vista parece una película normal sobre gánsteres esconde en su interior aspectos y detalles sobre la estereotipada representación de los personajes latinoamericanos como personas peligrosas, llamativas, excesivas y difíciles de controlar.<br /

Temporal variability of diazotroph community composition in the upwelling region off NW Iberia.

Knowledge of the ecology of N2-fixing (diazotrophic) plankton is mainly limited to oligotrophic (sub)tropical oceans. However, diazotrophs are widely distributed and active throughout the global ocean. Likewise, relatively little is known about the temporal dynamics of diazotrophs in productive areas. Between February 2014 and December 2015, we carried out 9 one-day samplings in the temperate northwestern Iberian upwelling system to investigate the temporal and vertical variability of the diazotrophic community and its relationship with hydrodynamic forcing. In downwelling conditions, characterized by deeper mixed layers and a homogeneous water column, non-cyanobacterial diazotrophs belonging mainly to nifH clusters 1G (Gammaproteobacteria) and 3 (putative anaerobes) dominated the diazotrophic community. In upwelling and relaxation conditions, affected by enhanced vertical stratification and hydrographic variability, the community was more heterogeneous vertically but less diverse, with prevalence of UCYN-A (unicellular cyanobacteria, subcluster 1B) and non-cyanobacterial diazotrophs from clusters 1G and 3. Oligotyping analysis of UCYN-A phylotype showed that UCYN-A2 sublineage was the most abundant (74%), followed by UCYN-A1 (23%) and UCYN-A4 (2%). UCYN-A1 oligotypes exhibited relatively low frequencies during the three hydrographic conditions, whereas UCYN-A2 showed higher abundances during upwelling and relaxation. Our findings show the presence of a diverse and temporally variable diazotrophic community driven by hydrodynamic forcing in an upwelling system

A PHYLOGENETIC PERSPECTIVE OF THE AVIAN TROPHIC DIVERSIFICATION: INTEGRATING PALAEONTOLOGICAL AND NEONTOLOGICAL INFORMATION

From their origin in the Middle Jurassic until the present, birds have undergone one of the most important evolutionary radiations among vertebrates, with the development of great species-level diversity and the occupation of a broad spectrum of ecological niches. Since dietary shifts involve a series of morphophysiological adjustments and reflect the use of the resources, diet represents a key ecological and evolutionary parameter to understand the history of bird clades. This study combines neontological and paleontological dietary information in a phylogenetic context, aiming the understanding the role of feeding habits in bird evolution and their potential relationship with past ecological and evolutionary events. Our findings point towards an omnivorous ancestral diet for the avian clade, which is consistent with dietary information, dental structure and life style of the first birds, such as Archaeopteryx. Our results also show dietary shifts in avian evolutionary history. Faunivores predominate in the avian history, while herbivorous lineages underwent adaptive radiations possibly related to transformation of ecosystems and their plant assemblages worldwide such as the development of the angiosperms during the Cretaceous or the development of grassy environments in the Oligocene. Faunivorous and herbivorous clades arose basically through diversification within lineages, while omnivores evolved due to transitions into the strategy. The capacity to specialize and generate new trophic niches allowed faunivores and herbivores to diversify more than omnivores. Nevertheless, despite this relatively low diversification, the omnivorous strategy appears to be key to the primary processes of bird radiation and fundamental in the evolutionary success of birds.Peer reviewe