A case for merging the ILP and DLP paradigms

The goal of this paper is to show that instruction level parallelism (ILP) and data-level parallelism (DLP) can be merged in a single architecture to execute vectorizable code at a performance level that can not be achieved using either paradigm on its own. We will show that the combination of the two techniques yields very high performance at a low cost and a low complexity. We will show that this architecture can reach a performance equivalent to a superscalar processor that sustained 10 instructions per cycle. We will see that the machine exploiting both types of parallelism improves upon the ILP-only machine by factors of 1.5-1.8. We also present a study on the scalability of both paradigms and show that, when we increase resources to reach a 16-issue machine, the advantage of the ILP+DLP machine over the ILP-only machine increases up to 2.0-3.45. While the peak achieved IPC for the ILP machine is 4, the ILP+DLP machine exceeds 10 instructions per cycle.Peer ReviewedPostprint (published version

EEES, TIC and teaching planning: A practical approach in the Escuela de Ingeniería Informática in the ULPGC

Este trabajo describe cómo afrontar la planificación y puesta en marcha de una asignatura en el marco del EEES. En ese contexto es necesario diseñar actividades que cubran las horas presenciales y no presenciales de la asignatura, así como una forma de tomar evidencias de la realización de las mismas por parte del estudiante, ya que todas las actividades han ser valoradas de cara a realizar la evaluación. Asimismo se presentan los resultados de los tres años en los que la asignatura se ha venido impartiendo siguiendo la planificación propuesta. En general, la planificación de la asignatura ha tenido una buena acogida por parte de los estudiantes que ven cómo el esfuerzo semanal se ve reconocido y no se juegan la asignatura en un examen final. En promedio, más del 88% de los estudiantes superan la asignatura con esta planificación.This paper describes how to plan a course in the EEES framework, and how to put it into practice. In this context it is necessary to make a scheduling that includes both attending teaching hours and personal working hours, as well as a way to catch evidences of them, as all of them must contribute to the student’s evaluation. It also presents the results of the three years in which the course has been taught following the proposed planning. In general, the planning of the course has been well received by students who perceived that weekly effort is recognized and not played the course in a final exam. On average, over 88% of the students pass the subject with this planning

Recurrence relations and outer relative asymptotics of orthogonal polynomials with respect to a discrete Sobolev type inner product

We investigate algebraic and analytic properties of sequences of polynomials orthogonal with respect to the Sobolev type inner product (f.g)= ∫▒〖f(x)g(x)dμ(x)+∑_(k=1)^K▒∑_(i=0)^(N_k)▒M_█(k.i@) 〗 f^((i) ) (b_k ) g^i (b_k ) where μ is a finite positive Borel measure belonging to the Nevai class, the mass points bk are located outside the support of μ, and Mk,i are complex numbers such that Mk,Nk = 0. First, we study the existence as well as recurrence relations for such polynomials. When the values Mk,i are nonnegative real numbers, we can deduce the coefficients of the recurrence relation in terms of the connection coefficients for the sequences of polynomials orthogonal with respect to the Sobolev type inner product and those orthogonal with respect to the measure μ. The matrix of a symmetric multiplication operator in terms of the above sequence of Sobolev type orthogonal polynomials is obtained from the Jacobi matrix associated with the measure μ. Finally, we focus our attention on some outer relative asymptotics of such polynomials, which are deduced by using the above connection formulasThe second authorwas partially supported by the Research Fellowship Program from Ministerio de Ciencia e Innovación (MTM 2009-12740-C03-01), Spain. The first, second and third authors were partially supported by a grant from Ministerio de Economía y Competitividad. Dirección General de Investigación Científica y Técnica (MTM 2012-36732-C03-01), Spai

EEES, TIC y planificación docente: un caso práctico en la Escuela de Ingeniería Informática de la ULPGC

Este trabajo describe cómo afrontar la planificación y puesta en marcha de una asignatura en el marco del EEES. En ese contexto es necesario diseñar actividades que cubran las horas presenciales y no presenciales de la asignatura, así como una forma de tomar evidencias de la realización de las mismas por parte del estudiante, ya que todas las actividades han ser valoradas de cara a realizar la evaluación. Asimismo se presentan los resultados de los tres años en los que la asignatura se ha venido impartiendo siguiendo la planificación propuesta. En general, la planificación de la asignatura ha tenido una buena acogida por parte de los estudiantes que ven cómo el esfuerzo semanal se ve reconocido y no se juegan la asignatura en un examen final. En promedio, más del 88% de los estudiantes superan la asignatura con esta planificación

Asymptotics for Laguerre-Sobolev type orthogonal polynomials modified within their oscillatory regime

In this paper we consider sequences of polynomials orthogonal with respect to the discrete Sobolev inner product (f.g)_s ∫_°^∞ f(x)g(x) x^(α ) e dx+F(c)ΑG(c)^t, α> 1 where f and g are polynomials with real coefficients A∈ R^2.2 and the vectors F(c), G(c) are A=(■(M&0@0&N)), F(c)=(f(c),f'(c) ) G(c)=(g(c),g'(c)) with M,N ∈ R and the mass point c is located inside the oscillatory region for the classical Laguerre polynomials. We focus our attention on the representation of these polynomials in terms of classical Laguerre polynomials and we analyze the behavior of the coefficients of the corresponding five term recurrence relation when the degree of the polynomials is large enough. Also, the outer relative asymptotics of the Laguerre Sobolev type with re spect to the Laguerre polynomials is analyzed

Ruthenium deposited onto graphitic carbon modified with boron for the intensified photocatalytic production of benzaldehyde

The selective oxidation of added-value aromatic alcohols into aldehydes of high interest via photocatalysis has been postulated as a green and competitive oxidative reaction at mild conditions. This work is focused on the design of a tertiary graphitic carbon nitride (g-C3N4) based photocatalysts competitive for the photocatalytic production of benzaldehyde in an aqueous solution. The polymeric g-C3N4 has been modified in an easy one-pot green synthesis scheme, with the incorporation of boron in the polymeric structure and the deposition of ruthenium nanoparticles. The Ru ratio within 0.5–4% was assessed. The photocatalysts were fully characterized (XRD, FTIR, XPS, N2 isotherms, DRS-UV–visible, and PL) and the photocatalytic activity was assessed in the oxidation of benzyl alcohol to benzaldehyde in an aqueous solution. The incorporation of boron enhanced the selectivity towards benzaldehyde due to enhanced separation charges suggested by the photoluminescence technique; whereas ruthenium improved the reaction rate of the alcohol, affecting negatively the selectivity though. The sample containing 1% of Ru was selected as the optimum in terms of selectivity. The relative contribution of the involved reactive oxidant species was assessed by chemical scavenger tests, highlighting the contribution of the photo-generated holes followed by O2•‾. The analysis of the band’s alignment of the g-C3N4 before the modification with boron and ruthenium supports the enhancement by rising the redox potential of the holes released in the valence band

Asymptotic behavior of the partial derivatives of Laguerre kernels and some applications

The aim of this paper is to present some new results about the asymptotic behavior of the partial derivatives of the kernel polynomials associated with the Gamma distribution. We also show how these results can be used in order to obtain the inner relative asymptotics for certain Laguerre-Sobolev type polynomials.The work of the first author (FM) has been supported by Dirección General de Investigación Científica y Técnica, Ministerio de Economía y Competitividad of Spain, grant MTM 2012-36732-C03-01. The work of the second author (MFPV) has been supported by the Research Fellowship Program, Ministerio de Ciencia e Innovación (MTM 2009-12740-C03-01) and Dirección General de Investigación Científica y Técnica, Ministerio de Economía y Competitividad of Spain, grant MTM 2012-36732-C03-01. The work of the third author (YQ) has been partially supported by Dirección General de Investigación Científica y Técnica, Ministerio de Economía y Competitividad of Spain, grant MTM 2012-36732-C03-01

Towards the photocatalytic production of cinnamaldehyde with phosphorous-tailored graphitic-like carbon nitride

Photocatalysis has emerged as an environmentally friendly technology to develop selective reactions such as the oxidation of alcohol to aldehydes. Graphitic carbon nitride (CN) is a metal-free polymeric structure easily photoactivated under radiation. This work focuses on the enhancement of the photocatalytic activity of bare CN by doping it with phosphorous (P-CN). Different doping levels of P (2–12 wt.) have been explored and the samples were fully characterized by XRD, FTIR, N2 physisorption, elemental analysis, XPS, DRS-UV–visible, and photoluminescence. A better activity and enhanced selectivity were observed in the P-CN samples if compared to the undoped CN in the oxidation of cinnamyl alcohol to cinnamaldehyde in aqueous solution. The presence of P was demonstrated to contribute to a better delocalization of photo-generated charges. Moreover, the reactivity and selectivity of the CN and P-CN samples were analyzed in water-acetonitrile mixtures, appreciating a better selectivity in the presence of acetonitrile to the detriment of the conversion of the cinnamyl alcohol. The photocatalytic oxidation mechanism over P-CN in aqueous media has been tentatively proposed based on the influence of the reactive oxidative species generated in the process by chemical scavenger tests. They suggested the contribution of superoxide radicals with more selectivity than the photo-generated holes, the second reactive species of importance in the overall oxidation scheme. The contribution of hydroxyl radicals was discharged since its presence was negligible in a probe test based on the formation of 2-hydroxy-terephthalic acid.University of Granada - “Precompetitive Research Projects” PPJIA2019-09 and PPJIA2021-34 grant

Boosted Activity of g-C3N4/UiO-66-NH2 Heterostructures for the Photocatalytic Degradation of Contaminants in Water

The combination of graphitic carbon nitride and the metal-organic framework UiO-66-NH2 has been developed with the aim to enhance the photocatalytic activity of pure semiconductors. Different proportions of g-C3N4 and UiO-66-NH2 were combined. Complete characterization analysis of the resulting photocatalytic materials was conducted, including N-2 adsorption isotherms, XRD, FTIR, STEM-EDX microscopy, DRS-UV-visible, and photoluminescence. The photocatalytic activity was tested in an aqueous solution for the removal of acetaminophen as the target pollutant. From the obtained results, less than 50% of UiO-66-NH2 incorporated in the g-C3N4 structure enhanced the photocatalytic degradation rate of both bare semiconductors. Concretely, 75% of g-C3N4 in the final g-C3N4 /UiO-66-NH2 heterostructure led to the best results, i.e., complete acetaminophen elimination initially at 5 mg.L-1 in 2 h with a pseudo-first order rate constant of ca. 2 h(-1). The presence of UiO-66-NH2 in the g-C3N4 enhanced the optoelectronic properties, concretely, the separation of the photo-generated charges was improved according to photoluminescence characterization. The better photo-absorption uptake was also confirmed by the determination of the quantum efficiency values of the heterostructure if compared to either pure g-C3N4 or UiO-66-NH2. This photocatalyst with the best activity was further tested at different pH values, with the best degradation rate at a pH close to the pH(pzc) similar to 4.15 of the solid. Sequential recycling tests demonstrated that the heterostructure was stable after five cycles of use, i.e., 15 h. A high contribution of photo-generated holes in the process of the degradation of acetaminophen, followed marginally by superoxide radicals, was suggested by scavenger tests.University of Granada PPJIA2019-09 PPJIA2021-3

A structural equation model of achievement emotions, coping strategies and engagement-burnout in undergraduate students: a possible underlying mechanism in facets of perfectionism

Achievement emotions that the university student experiences in the learning process can be significant in facilitating or interfering with learning. The present research looked for linear and predictive relations between university students¿ achievement emotions, coping strategies, and engagement-burnout, in three dierent learning situations (classroom, study time, and testing). Hypotheses were identified for a possible model that would analyze the two facets of perfectionism based on these relations. In the case of perfectionistic strivings, the test hypothesis was that positive emotions would predispose the use of problem-focused coping strategies and an emotional state of engagement; in the case of perfectionistic concerns, however, negative emotions would predispose the use of emotion-focused strategies and a state of burnout. A total of 654 university students participated in the study, using an online tool to complete validated questionnaires on the three study variables. All students provided informed consent and corresponding permissions. Given the ex-post facto linear design, the predictions could be verified for each situation by means of logistic regression analyses and Structural Equations Models (SEM). Empirical results lent support, in varying degree, to the proposed theoretical relations. The testing situation was of particular interest. We discuss implications for perfectionism research and for the practice of prevention, education and health care in the university setting