94,195 research outputs found
An extension of a uniqueness theorem of J. A. Goldstein
Get PDFAbstractA general uniqueness theorem for the abstract Cauchy problem x′(t) = f(t, x(t)); x(t) = P(t) + o(μ(t)) as t ↓ 0 is proved extending a result due to Goldstein. Applications of this theorem to a partial differential equation of a generalized Euler-Poisson-Darboux type are also discussed
Identifying gene and protein mentions in text using conditional random fields
Get PDFWe present a model for tagging gene and protein mentions from text using the probabilistic sequence tagging framework of conditional random fields (CRFs). Conditional random fields model the probability P(t|o) of a tag sequence given an observation sequence directly, and have previously been employed successfully for other tagging tasks. The mechanics of CRFs and their relationship to maximum entropy are discussed in detail.
We employ a diverse feature set containing standard orthographic features combined with expert features in the form of gene and biological term lexicons to achieve a precision of 86.4% and recall of 78.7%. An analysis of the contribution of the various features of the model is provided
La invariación acústica en las oclusivas sordas del castellano
Get PDFEn este estudio hemos pretendido averiguar si breves estÃmulos CV de proporcionan suficientes Ãndices acústicos para la correcta identificación del punto de articulación en las oclusivas sordas del castellano. Con este objetivo,se sintetizamos una serie de sÃlabas de corta duración (lO, 20, 29 Y 46 ms.) que fueron posterionnente manipuladas, eliminando transiciones y/o explosión, para asà poder valorar el grado de influencia que estos parámetros ejercen en la percepción. Estos estimulos fueron presentados a oyentes en forma de tests perceptivos. Los resultados obtenidos, aunque no tan esperanza-dores como los de Blurnstein & Stevens (1980) para el inglés, nos permiten, sin embargo, corroborar la validez de la hipótesis inicial, es decir, que estÃmulos de muy corta duración bastan a los oyentes a la hora de decidir entre [p] [t] o [kJ además de identificar con facilidad la vocal siguiente
El concepto de desarrollo desviado en L.S. Vygotsky
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Interacción entre alineamiento inverso (jerárquico) y orientación verbal hacia P/T o R en los verbos transitivos del nivacle (Chaco paraguayo)
Get PDFEl objetivo de este trabajo es presentar la interacción, en los verbos transitivos del nivacle, entre el alineamiento inverso (jerárquico) y el macro-papel objeto que distingue entre verbos orientados hacia el tema/paciente, y verbos orientados hacia el recipiente. Por otra parte, el alineamiento inverso prescinde de cualquier morfema directo/inverso, a la vez que aparece un único argumento (ya A, ya P/T o R), elegido según una jerarquÃa de personas 1 > 2 > 3. El análisis se centra en los argumentos prefijados de los verbos de la quinta conjugación, la única que implica dos argumentos en posición de prefijo
Földmérők Savariaban. Javaslat a savariai centuriatio újabb elméleti modelljére.
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Lesions mimicking lacrimal gland pleomorphic adenoma
Get PDFAim: To report a series of patients with lacrimal gland lesions simulating the clinicoradiological features of lacrimal gland pleomorphic adenoma (LGPA). Methods: Multicentre retrospective, interventional case series. Clinical records of all patients with lesions mimicking LGPA seen in five orbital units were reviewed. Results: The study included 14 patients (seven men and seven women) with a mean age of 50.9 years. The diagnosis of LGPA was made in all cases by experienced orbital surgeons, based on clinicoradiological features, and lacrimal gland excision was performed. Postoperative histology revealed lymphoma (four patients), chronic dacryoadenitis (three patients), adenoid cystic carcinoma (two patients), Sjogren's syndrome (two patients), cavernous haemangioma (one patient), benign lymphoid hyperplasia (one patient) and granulomatous dacryoadenitis (one patient). Comparison with the total number of histologically confirmed LGPA cases seen during the study period revealed that 22.6% of cases of suspected LGPA were misdiagnosed based on clinicoradiological criteria. Conclusions: Many different lesions may mimic the clinicoradiological features of LGPA. The accepted clinicoradiological criteria used for the diagnosis of LGPA have a high false-positive rate, even in experienced hands. Based on this study, the authors believe that fine-needle aspiration biopsy or intraoperative biopsy and frozen section diagnosis may help reduce unnecessary lacrimal gland excision.Venkatesh C Prabhakaran, Paul S Cannon, Alan McNab, Garry Davis, Brett O’Donnell, Peter J Dolman, Raf Ghabrial, Dinesh Selv
Asymmetry of acetylcholinesterase and acetylcholine receptor in intact secretory vesicles from adrenal medulla
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