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Search Results: 1 - 10 of 73687 matches for " Josep Maria Domingo Clua "
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Carles Bosch de la Trinxeria - Narcís Oller: cartes
Josep Maria Domingo Clua
Llengua & Literatura , 1998, DOI: 10.2436/l&l.vi.1267
Les arrels filosòfiques i antropològiques de la "psicologia cultural" de Jerome Bruner
Josep Maria Domingo Curto
Temps d'Educació , 1999,
On Overlappings of Digitized Straight Lines and Shared Steganographic File Systems
Maria Bras-Amoros,Josep Domingo-Ferrer
Transactions on Data Privacy , 2008,
Abstract: We consider the unbounded integer grid and the digitized version of the straight line y=a x+b, with a,b in R being the set of points (i,[a i+b]), i in Z, where [.] is the integer rounding operator ([x]-0.5 less or equal than x less than [x]+0.5). We address the problem of counting the number of points in the integer grid in which two digitized straight lines overlap each other in the particular case when the crossing point of the non-digitized version of the lines has integer coordinates and the slopes belong to the set {a/b:a in {-(N-1),..,(N-1)}, b in {1,..,(N-1)}}, that is, all the possible slopes of the segments between two different points in the N x N grid. Applications of this problem are explained, with a special focus on a shared steganographic system with error correction.
Assessment of Climate Change in Nicaragua: Analysis of Precipitation and Temperature by Dynamical Downscaling over a 30-Year Horizon  [PDF]
Josep Maria Solé, Raúl Arasa, Miquel Picanyol, Ma ángeles González, Anna Domingo-Dalmau, Marta Masdeu, Ignasi Porras, Bernat Codina
Atmospheric and Climate Sciences (ACS) , 2016, DOI: 10.4236/acs.2016.63036
Abstract: The present study has generated and analyzed Climate Change projections in Nicaragua for the period 2010-2040. The obtained results are to be used for evaluating and planning more resilient transport infrastructures in the next decades. This study has focused its efforts to pay attention into the effect of Climate Change on precipitation and temperature from a mean and extreme event perspective. Dynamical Downscaling approach on a 4 km resolution grid has been chosen as the most appropriate methodology for the estimation of the projected climate, being able to account for local-scale factors like complex topography or local land uses properly. We selected MPI-ESM-MR as the global climate model with the best skill scores in terms of precipitation and temperature in Nicaragua. MPI-ESM-MR was coupled to a mesoscale model. We chose WRF mesoescale model as the most appropriate regional model and we optimized their physical and dynamical options in order to minimize the model uncertainty in Nicaragua. For this, model output against the available in-situ measurements from the national meteorological station network and satellite data were compared. Climate change signal was estimated by comparing the different climate statistics calculated from a model run over an historical period, 1980-2009, with a model run over a projected period, 2010-2040. The obtained results from the projected climate show an increase of the mean temperature between 0.6°C and 0.8°C and an increase of the number of days per year with maximum daily temperatures higher than 35°C. Regarding precipitation, annual projected amounts do not change remarkably with respect to the historical period. However, significant changes in the distribution of the precipitation within the wet period (May-October) were observed. Moreover, an increment between 5% and 10% of the number of days without precipitation is expected. Finally, Intensity-Duration-Frequency (IDF) projected curves show an increment of the rainfall intensity and an increment of extreme precipitation event frequency, especially in the Caribbean basin.
Marginality: a numerical mapping for enhanced treatment of nominal and hierarchical attributes
Josep Domingo-Ferrer
Computer Science , 2012,
Abstract: The purpose of statistical disclosure control (SDC) of microdata, a.k.a. data anonymization or privacy-preserving data mining, is to publish data sets containing the answers of individual respondents in such a way that the respondents corresponding to the released records cannot be re-identified and the released data are analytically useful. SDC methods are either based on masking the original data, generating synthetic versions of them or creating hybrid versions by combining original and synthetic data. The choice of SDC methods for categorical data, especially nominal data, is much smaller than the choice of methods for numerical data. We mitigate this problem by introducing a numerical mapping for hierarchical nominal data which allows computing means, variances and covariances on them.
Linear Robust Output Regulation in a Class of Switched Power Converters
Josep M. Olm,Domingo Biel
Mathematical Problems in Engineering , 2010, DOI: 10.1155/2010/724531
Abstract: This article addresses the robust output regulation problem for a class of nonlinear switched power converters after its linearization by means of a change of the control vector variable. The methodology employs a dynamic state feedback control law and considers parametric uncertainty due to unknown values of resistive loads. Restrictions arising from the fact that the control gains exhibit fixed values are taken into account. The proposed technique is exemplified with the output voltage regulation of a Noninverting Buck-Boost converter and tested through realistic numerical simulations.
The Choice of Screening Instrument Matters: The Case of Problematic Cannabis Use Screening in Spanish Population of Adolescents
Danica Thanki,Antónia Domingo-Salvany,Gregorio Barrio Anta,Amparo Sánchez Ma?ez,Noelia Llorens Aleixandre,Josep Maria Suelves,Bego?a Brime Beteta,Julián Vicente
ISRN Addiction , 2013, DOI: 10.1155/2013/723131
Abstract: The aim of this study was to examine the feasibility of problem cannabis use screening instruments administration within wide school surveys, their psychometric properties, overlaps, and relationships with other variables. Students from 7 Spanish regions, aged 14–18, who attended secondary schools were sampled by two-stage cluster sampling (net sample 14,589). Standardized, anonymous questionnaire including DSM-IV cannabis abuse criteria, Cannabis Abuse Screening Test (CAST), and Severity of Dependence Scale (SDS) was self-completed with paper and pencil in the selected classrooms. Data was analysed using classical psychometric theory, bivariate tests, and multinomial logistic regression analysis. Not responding to instruments’ items (10.5–12.3%) was associated with reporting less frequent cannabis use. The instruments overlapped partially, with 16.1% of positives being positive on all three. SDS was more likely to identify younger users with lower frequency of use who thought habitual cannabis use posed a considerable problem. CAST positivity was associated with frequent cannabis use and related problems. It is feasible to use short psychometric scales in wide school surveys, but one must carefully choose the screening instrument, as different instruments identify different groups of users. These may correspond to different types of problematic cannabis use; however, measurement bias seems to play a role too. 1. Introduction Cannabis is the most widely used illicit drug worldwide [1]. Spain is currently the country with the highest last month prevalence of cannabis use among those aged 15–24 in Europe, with consistently high figures since 2005 (17.2–18.6%, [2]) and with the highest prevalence of regular (3–39 times within the past 12 months) and heavy (40 times or more within the past 12 months) use according to 2009/2010 HBSC (Health Behaviour in School-Aged Children, [3]) survey of 15-16-year olds [4]. A range of negative effects of regular cannabis use on adolescent health and psychosocial status have been identified, including adverse effects on psychosocial development and mental health (including developing psychotic symptoms), decrease in academic performance (which can lead to academic failure), and other negative outcomes later in life [5–9]. Since 2009, cannabis as a primary drug has overtaken heroin among those requesting drug treatment for the first time in their lives in the European Union. Its mention as a primary drug further increased in 2010 (accounting for more than 100?000 treatment demands). In this year, 76% of reported treatment
Anatomical features of the urethra and urinary bladder catheterization in female mice and rats. An essential translational tool
Reis, Leonardo Oliveira;Sopena, Josep Maria Gaya;Fávaro, Wagner José;Martin, Mireia Castilho;Sim?o, Ant?nio Felipe Leite;Reis, Rodolfo Borges dos;Andrade, Murilo Ferreira de;Domenech, Josep Domingo;Cardo, Carlos Cordon;
Acta Cirurgica Brasileira , 2011, DOI: 10.1590/S0102-86502011000800019
Abstract: purpose: to present fundamental anatomical aspects and technical skills necessary to urethra and urinary bladder catheterization in female mice and rats. methods: urethral and bladder catheterization has been widely utilized for carcinogenesis and cancer research and still remains very useful in several applications: from toxicological purposes as well as inflammatory and infectious conditions to functional aspects as bladder dynamics and vesicoureteral reflux, among many others. results: animal models are in the center of translational research and those involving rodents are the most important nowadays due to several advantages including human reproducibility, easy handling and low cost. conclusions: although technical and anatomical pearls for rodent urethral and bladder access are presented as tackles to the advancement of lower urinary tract preclinical investigation in a broaden sight, restriction to female animals hampers the male microenvironment, demanding future advances.
Epidemiological characteristics and predictors of late presentation of HIV infection in Barcelona (Spain) during the period 2001-2009
Patricia de Olalla, Christian Manzardo, Maria A Sambeat, Inma Oca?a, Hernando Knobel, Victoria Humet, Pere Domingo, Esteve Ribera, Ana Guelar, Andres Marco, Maria J Belza, Josep M Miró, Joan A Caylà, the HIV Surveillance Group
AIDS Research and Therapy , 2011, DOI: 10.1186/1742-6405-8-22
Abstract: Demographic and epidemiological characteristics of cases reported to the Barcelona HIV surveillance system were analysed. Late presentation was defined for individuals with a CD4 count below 350 cells/ml upon HIV diagnosis or diagnosis of AIDS within 3 months of HIV diagnosis. Multivariate logistic regression were used to identify predictors of late presentation.Of the 2,938 newly diagnosed HIV-infected individuals, 2,507 (85,3%) had either a CD4 cell count or an AIDS diagnosis available. A total of 1,139 (55.6%) of the 2,507 studied cases over these nine years were late presenters varying from 48% among men who have sex with men to 70% among heterosexual men. The proportion of late presentation was 62.7% in 2001-2003, 51.9% in 2004-2005, 52.6% in 2006-2007 and 52.1% in 2008-2009. A decrease over time only was observed between 2001-2003 and 2004-2005 (p = 0.001) but remained constant thereafter (p = 0.9). Independent risk factors for late presentation were older age at diagnosis (p < 0.0001), use of injected drugs by men (p < 0.0001), being a heterosexual men (p < 0.0001), and being born in South America (p < 0.0001) or sub-Saharan Africa (p = 0.002).Late presentation of HIV is still too frequent in all transmission groups in spite of a strong commitment with HIV prevention in our city. It is necessary to develop interventions that increase HIV testing and facilitate earlier entry into HIV care.In the European Union it is estimated that 15-38% of cases of HIV infection are diagnosed late [1] and 30% of infected individuals are not aware of their serological status, with proportions that vary between 12% and 20% in Sweden to more than 50% in Poland [2]. In Spain 56.3% of new diagnoses of HIV infection between 2003 and 2007 required treatment (CD4 < 350 cells/μl) at the time of diagnosis and 30.2% of these presented severe immunosuppression (CD4 < 200 cells/μl) [3].Reducing the time elapsed between infection and the initiation of antiretroviral therapy (ART) is import
Vicenc Torra,Josep Domingo-Ferrer
Transactions on Data Privacy , 2008,
Abstract: Welcome to the first issue of the Transactions on Data Privacy ! The aim of this peer reviewed journal is to provide an international forum for researchers on all topics related to data privacy technologies. TDP has been created with the ambition of becoming soon a privacy journal indexed in all major scientific databases. A volume of The Transactions on Data Privacy will be published every year. Each volume consists on three issues. The journal will publish original and high quality papers. TDP welcomes archival research papers, comprehensive reviews, authoritative tutorials, short notes and comprehensive book reviews. All papers will be peer-reviewed. The journal will accept submissions from multiple disciplines related to the various aspects of data privacy (e.g. statistics, cryptography, database technology, data communication, etc.). Regarding the application papers, contributions to solving privacy problems in the main application areas (e.g. official statistics, electronic commerce and Internet, healthcare, telecommunications, etc.) are welcome. Papers can be theoretical or applied. TDP starts its publication under the sponsorship of the IIIA-CSIC (Artificial Intelligence Research Institute of the Spanish Higher Research Council), the UNESCO Chair in Data Privacy and the Catalan Association of Artificial Intelligence (an ECCAI member). This first issue includes three papers. The inaugural paper by Lane, Heus, and Mulcahy is a position paper on data access and data privacy. The second paper by Muralidhar and Sarathy is about a perturbative method to protect numerical microdata. The third paper by Smith and Elliot is about the protection of tabular data (aggregated data). In the next issues of this year, papers on synthetic data generation, $k$-anonymity, and software for data protection are scheduled.
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