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Search Results: 1 - 10 of 232517 matches for " Martín Fernández "
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Análisis del perfecto fuerte en cuatro fragmentos de obras medievales en castellano
Fernández Martín,Patricia;
Boletín de filología , 2009, DOI: 10.4067/S0718-93032009000100003
Abstract: there aim of this paper is twofold: on the one hand, to determinate the frequency of simple past tense forms in strong verbs is to analizes in written spanish texts between xii and xiv century. on the other hand, to verify whether the verbs in modern spanish which keep on using strong forms in simple past tense are the same verbs which undergo a strong process of gramaticalization in numerous idioms or verbal periphrasis. thus, the main conclusion will take into account that the frequency of usage of the simple past tense forms in some strong verbs remains the same in spite of being apparently irregular. this might allow us to think that the more frequently used a word is used, the fewer are the chances that that word changes.
Propuesta de un prototipo participial con base en cuatro perífrasis verbales
Fernández Martín,Patricia;
Boletín de filología , 2012, DOI: 10.4067/S0718-93032012000100002
Abstract: the aim of this paper is to propose a definition of the category 'participle' grounded on the cognitive theory of prototype by means of a quantitative approach. thus, we firstly address the main issues affecting the determination of the dual nature of the participle, namely, its verbal and adjectival status. then, we will explain how to solve such problems on the basis of the theory of prototype so that the category participle may be understood in a continuum whose ends are the full verb and the full adjective -depending on the specific language use where a past participle form is present, it will tend to be closer to one end or the other. finally, as an attempt to search for empirical arguments, we will analyze a corpus based on the assumption that its main prototypical characteristic (which is, at the same time, the key to apprehend its dual nature) is the fact that it can be part of four verbal periphrases (with tener, haber, ser y estar). these periphrases enables the analyst to determine the degree of 'verbality' or 'adjectivity' of the non-personal participle form on the basis of the semantic nature of the auxiliary verbs -especially, if such a form belongs to the third group of participles, namely, perfective adjectives. the main conclusion of the study, insofar as the relations holding between participle forms and the auxiliary verbs listed above are concerned, is the claim that the creation of a 'quantitatively-based prototype' enabling the measurement of the degrees of (a)grammaticality of the relevant utterances collected in a corpus, can give rise to new powerful descriptive trends within linguistic research.
Análisis de un modelo económico de una estrategia poblacional de vacunación gripal en trabajadores sanos
Martín Fernández,Jesus;
Revista Espa?ola de Salud Pública , 2006, DOI: 10.1590/S1135-57272006000300002
Abstract: background: a debate exists as to whether it is advisable to extend the influenza immunization programs to the entire population, possibly due to the economic impact of this measure. this study is aimed at analyzing the cost-benefit ratio of an influenza immunization strategy among our country's working population. methods: economic study from a social standpoint, including the direct and indirect costs (lost productive time, adverse effects) of the immunization. the costs avoided include the loss of productivity (from the human capital standpoint) and the health costs avoided when the infection is prevented. a costs avoided/costs incurred ratio, known as the return rate (rr) is constructed. the costs are converted into constant 2003 euros. the data was compiled from published sources and a sensitivity analysis presented. results: the average cost of each immunization is 13.58 (95% ci 13.54 - 13.62) euros. each case of influenza avoided saves an average expense of 374.71 (95% ci 372.59 - 376.83) euros. every 1,000 immunizations would avoid an average of 29.3 influenza cases (95% ci 29.0 - 29.5 ). the net cost of immunization is 2.60 (95% ci 2.51 - 2.70) euros. the rr has an average value of 0.80 (95% ci 0.79 - 0.81), median 0.74, interquartile range (0.53 - 1.02) euros. in the case of avoiding more than 36 cases of influenza per 1,000 immunizations, the rr takes on values >1. conclusions: the influenza immunization strategy for the working population is solely cost-effective for situations of high influence incidence and high vaccine effectiveness.
Propuesta de un prototipo participial con base en cuatro perífrasis verbales A PROPOSAL FOR A PROTOTYPICAL PARTICIPLE ON THE BASIS OF FOUR VERBAL PERIPHRASES
Patricia Fernández Martín
Boletín de Filología , 2012,
Abstract: El objetivo de este artículo es proponer una definición de la categoría 'participio' recurriendo al modelo cognitivo de 'prototipo' en una perspectiva cuantitativa. Para ello, comenzaremos abordando los principales problemas descriptivos que afectan la determinación de la doble naturaleza del participio: verbal y adjetival. Posteriormente, trataremos de explicar cómo pueden solucionarse dichos problemas desde el modelo cognitivo del prototipo, de manera que la categoría participial sea entendida como inserta en un continuum cuyos extremos son el verbo puro y el adjetivo puro. En función del contexto de lengua en el que se realice, tenderá a acercarse más a un extremo o al otro. Finalmente, para poder sostener la existencia del prototipo con argumentos empíricos, propondremos un análisis de corpus partiendo de una hipótesis base, según la cual la principal característica prototípica de la categoría 'participio' (que es, a la vez, la clave de la realización de su doble naturaleza) es su plasmabilidad en cuatro perífrasis verbales (a saber, tener, haber; ser, estar), que permiten, por la esencia de sus auxiliares, comprobar el grado de 'verbalidad' o 'adjetividad' de la forma no personal, especialmente si esta es mixta (es decir, regular e irregular o trunca). La conclusión principal del estudio apunta a que especialmente en la relación de los participios con los verbos auxiliares citados, la creación de un prototipo cuantitativo que permita medir los grados de (a)gramaticalidad de los enunciados recogidos en un corpus puede dar un gran poder descriptivo a la investigación lingüística del caso. The aim of this paper is to propose a definition of the category 'participle' grounded on the cognitive theory of prototype by means of a quantitative approach. Thus, we firstly address the main issues affecting the determination of the dual nature of the participle, namely, its verbal and adjectival status. Then, we will explain how to solve such problems on the basis of the theory of prototype so that the category participle may be understood in a continuum whose ends are the full verb and the full adjective -depending on the specific language use where a past participle form is present, it will tend to be closer to one end or the other. Finally, as an attempt to search for empirical arguments, we will analyze a corpus based on the assumption that its main prototypical characteristic (which is, at the same time, the key to apprehend its dual nature) is the fact that it can be part of four verbal periphrases (with tener, haber, ser y estar). These periphrases enabl
Análisis del perfecto fuerte en cuatro fragmentos de obras medievales en castellano Analysis of the strong forms in Simple Past in four fragments of Spanish Mediaeval Texts
Patricia Fernández Martín
Boletín de Filología , 2009,
Abstract: En el presente artículo se proponen dos objetivos: i) comprobar el grado de frecuencia de aparición del perfecto fuerte en el período correspondiente en las obras estudiadas y ii) analizar si los verbos que en la actualidad siguen manteniendo las formas fuertes del perfecto son los mismos que aquellos que sufren una fuerte gramaticalización plausible en expresiones idiomáticas o perífrasis verbales. Para ello, se expondrán los resultados del análisis de los cuatro fragmentos de obras medievales y se llegará a la conclusión de que la frecuencia de uso de las formas de perfecto de determinados verbos se mantiene con el paso del tiempo a pesar de su aparente irregularidad. Esto implicará, finalmente, la hipótesis de que cuanto más se usa una palabra, menos probabilidades parece haber de que esa palabra cambie. There aim of this paper is twofold: on the one hand, to determinate the frequency of Simple Past Tense forms in strong verbs is to analizes in written Spanish texts between XII and XIV century. On the other hand, to verify whether the verbs in Modern Spanish which keep on using strong forms in Simple Past Tense are the same verbs which undergo a strong process of gramaticalization in numerous idioms or verbal periphrasis. Thus, the main conclusion will take into account that the frequency of usage of the Simple Past Tense forms in some strong verbs remains the same in spite of being apparently irregular. This might allow us to think that the more frequently used a word is used, the fewer are the chances that that word changes.
Evaluación de las competencias clínicas en una residencia de pediatría con el Mini-CEX (Mini-Clinical Evaluation Exercise)
Fernández Gálvez,Gabriel Martín;
Archivos argentinos de pediatr?-a , 2011,
Abstract: purpose. assess the clinical competence of pediatric residents with the implementation of mini-clinical evaluation exercise (mini-cex), determining its validity, reliability, feasibility and satisfaction of examiners and residents. methods. 14 examiners and 8 residents of pediatrics took part. the mini-cex, a method based on direct observation of residents during their daily training, was used. a nine-point rating scale was used in order to evaluate their skills regarding medical interviewing, physical examination, professionalism, clinical judgment, counselling, organization, overall competence and satisfaction with the method. results. 181 observations were made, an average of 12.92 observations per examiner (range-2-39). each examiner assessed 5.78 residents, (range 2-8). there was an average of 22.6 assessments per resident, range (18-30). the observations took place in outpatient clinic 38.7%, pediatric inpatient unit 19.3%, neonatal intensive care unit 17.1%, neonatal reception unit 14.4% and rooming-in 10.5%. the mean scores were: professionalism 7.15; interviewing 6.64; physical examination 6.67; clinical judgment 6.70; counselling 6.79 and organization 6.73. the overall competence score varied according to experience levels. mean scores were: frst-year residents 6.57; second-year residents 6.87 and third-year residents 7.3; p= 0.004. the score related to ex-aminers's satisfaction was 7.89 and that of the residents was 7.74. the duration of the observation period was 28.35 minutes. cronbach alfa coeffcient was 0.97 showing the high reliability of the assessment method. the anova score for overall competence of all examiners showed statistically signifcant differences, p <0.0001 in relation to stricter or more lenient judgment to evaluate skills. conclusions. the implementation of the mini-cex in the pediatrics residency was feasible and positively accepted by residents and examiners. it allowed the assessment of different levels of performance among resident
Tree-Based Revocation for Certificateless Authentication in Vehicular Ad-Hoc Networks  [PDF]
Pino Caballero-Gil, Francisco Martín-Fernández, Cándido Caballero-Gil
Journal of Computer and Communications (JCC) , 2014, DOI: 10.4236/jcc.2014.29003
Abstract:

This work proposes authentication based on identity as a way to increase the efficiency and security of communications in vehicular ad-hoc networks. When using identity-based cryptography to achieve certificateless authentication, membership revocation is not a trivial problem. Thus, in order to improve the performance of revocation in such networks, the use of a dynamic authenticated data structure based on perfect k-ary hash trees combined with a duplex version of the new standard SHA-3 is here presented. Efficient algorithms in the used revocation trees allow reaching a refresh rate of at most simple updates per inserted node. Consequently, the proposal is especially useful for situations with frequent revocations, which are foreseeable when vehicular ad- hoc networks are widely deployed.

Una muestra literaria del siglo XVIII como testimonios de una realidad en las antillas espa olas: la sociedad de castas
Mercedes ROMáN FERNáNDEZ,Javier MARTíN SILVA
Cuadernos Dieciochistas , 2009,
Abstract: RESUMEN: La emigración a la zona antillana, concretamente en la frontera de Santo Domingo con la futura república de Haití, en tiempos de los Borbones se estudia aquí por las referencias étnicas derivadas de las condiciones históricas y socioculturales que intervinieron en el mestizaje, fundamentalmente por la llegada a aquellas tierras de mujeres. ABSTRACT: Emigration to the Antilles in the era of the Bourbon monarchy in Spain, specifically on the border between Santo Domingo and the future republic of Haiti, is studied here through the ethnic references derived from the historical and socio-cultural conditions involved in miscegenation, mainly the arrival of women in those lands.
Single sperm selection and DNA fragmentation analysis: The case of MSOME/IMSI  [PDF]
Jaime Gosálvez, Beatriz Migueles, Carmen López-Fernández, Fernando Sanchéz-Martín, Pascual Sáchez-Martín
Natural Science (NS) , 2013, DOI: 10.4236/ns.2013.57A002
Abstract:

Sperm of poor quality may affect syngamy after fertilization, embryo development up to the blastocyst stage and reproductive outcome. Subsequently, sperm selection based on morphological characteristics and sperm DNA quality may help to partially avoid these problems. Today, highly efficient sperm selection based on morphological characteristics can be attained using the motile sperm organelle morphology (MSOME) examination, and the spermatozoa selected can be used for ICSI through a fertilization strategy known as intra-cytoplasmic morphologically selected sperm injection (IMSI). The aim of this investigation was to develop a simple methodology to assess sperm DNA fragmentation in single spermatozoa following MSOME/ IMSI, to test the hypothesis that morphologically normal spermatozoa, with an absence of vacuolization, is free of DNA damage. The results indicated that MSOME/IMSI-selected sperm, combined with the Sperm Chromatin Dispersion test (SCD; Oligo-Halosperm), can be reliably used to assess sperm DNA damage in selected single spermatozoa (75% average efficiency), thereby establishing a direct relationship between a good morphological pattern on the sperm and a good DNA quality. Furthermore, results showed spermatozoa presenting a normal morphology and no traces of vacuolization to be fully free of DNA damage. However, traces of vacuolization and more severe morphological alterations were accompanied by significant increases in the proportion of sperm containing a damaged DNA molecule. Interestingly, subtle morphological differences observed between normal and non-vacuolated and normal but vacuolated sperm exhibited significant differrences in the ability of the SCD-Oligo-Halosperm treated sperm to expand DNA fibers following protein depletion.

Dacriocistorrinostomía transcanalicular con láser diodo
Ala?ón Fernández,FJ; Ala?ón Fernández,MA; Martínez Fernández,A; Cárdenas Lara,M;
Archivos de la Sociedad Espa?ola de Oftalmología , 2004, DOI: 10.4321/S0365-66912004000700005
Abstract: purpose: to describe the surgical technique and to evaluate the clinical results of carrying out transcanalicular dacryocystorhinostomies using a diode laser (dcr-tc), including the advantages and limitationss of this technique. methods: 43 dcr-tc were studied and they were analysed using a prospective, interventional, non randomized and non comparative study. we used local and topical anaesthesia in patients with a clinical history of epiphora or dacryocystitis for nasolacrimal obstruction. a diode laser was used to effect a vaporization of the lacrimal sac, osteotomy and vaporization with coagulation of nasal mucosa. the mean duration of surgery was 14 minutes (range 7 to 29 minutes). in all cases, and during a two-month period, bicanalicular intubation was carried out using a silicone tube and prolene filament. follow-up was between 4 to 38 months. the degree of epiphora was evaluated using the munk scale and lacrimal permeability was evaluated using jones i and ii tests by direct videoendoscopic control in all cases. results: 43 dcr-tc were realized, 39 cases are asymptomatic (90.7%). 2 of them (4.65%) had epiphora (degree 2 on the munk scale) and permeable tract. one case (2.32%) presented lower canaliculi obstruction. one patient showed total osteotomy closing . conclusions: transcanalicular dacryocystorhinostomy carried out using a diode laser is a useful method because it does not cause cutaneous scarring, it hardly produces pain and bleeding, it respects the lacrimal pump, it needs less surgical time, it can be carried out in an out-patient surgery and it generates minimal intra and postsurgical morbility.
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