53 resultados para LDPC decoding


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Pós-graduação em Educação - FCT

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Pós-graduação em Geografia - IGCE

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Pós-graduação em Fonoaudiologia - FFC

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Purpose: To investigate parameters related to fluency, reading comprehension and phonological processing (operational and short-term memory) and identify potential correlation between the variables in Dyslexia and in the absence of reading difficulties.Method: One hundred and fifteen students from the third to eighth grade of elementary school were grouped into a Control Group (CG) and Group with Dyslexia (GDys). Reading of words, pseudowords and text (decoding); listening and reading comprehension; phonological short-term and working memory (repetition of pseudowords and Digit Span) were evaluated.Results: The comparison of the groups showed significant differences in decoding, phonological short-term memory (repetition of pseudowords) and answers to text-connecting questions (TC) on reading comprehension, with the worst performances identified for GDys. In this group there were negative correlations between pseudowords repetition and TC answers and total score, both on listening comprehension. No correlations were found between operational and short-term memory (Digit Span) and parameters of fluency and reading comprehension in dyslexia. For the sample without complaint, there were positive correlations between some parameters of reading fluency and repetition of pseudowords and also between answering literal questions in listening comprehension and repetition of digits on the direct and reverse order. There was no correlation with the parameters of reading comprehension.Conclusion: GDys and CG showed similar performance in listening comprehension and in understanding of explicit information and gap-filling inference on reading comprehension. Students of GDys showed worst performance in reading decoding, phonological short-term memory (pseudowords) and on inferences that depends on textual cohesion understanding in reading. There were negative correlations between pseudowords repetition and TC answers and total score, both in listening comprehension.

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Reading is a complex process that involves cognitive and linguistic skills, such as decoding and comprehension. When the skill to understand texts is not performed there is a commitment throughout the learning process interfering with the development of the student as a whole. Ensuring that the student carries out reading efficiently is one of the main challenges of schools. Considering these aspects, this study, through reflection of previous studies, presents the processes involved in reading comprehension, as well as problems that can interfere with these processes, assessment and intervention strategies with the students so that possible difficulties in the educational context can be minimized.

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This study aimed to characterize and to compare the performance of students with an interdisciplinary diagnosis of dyslexia and attention deficit hyperactivity disorder (ADHD) in students with good academic performance on the reading processes. Sixty students from both genders, from 2nd to 4th grades of municipal public schools in Marília - SP participated in this study, they were distributed as follows: GI, 20 students with interdisciplinary diagnosis of dyslexia; GII, 20 students with ADHD and GIII, 20 students with good academic performance, paired according to gender, age and grade level with GI and GII. The students were submitted to the application of the assessment of reading processes (PROLEC) composed by four processes: letters identification, lexical, syntactical and semantic. The results highlighted that the students of GIII showed superior performance comparing with GI and GII. There was difference between GI and GII only in low frequency word reading and non words reading of the lexical process. The inferior performance from GI and GII in the PROLEC tests can be justified by the difficulty on the coding and decoding abilities. In ADHD students this difficulty was due to impaired interaction between the visual, linguistic, attention and auditory processing and in the dyslexic students was due to failure at the phonological mediation process, which depends on the knowledge of rules of grapheme - phoneme conversion to the acquisition of word reading. These changes affect the reading achievement and the comprehension of the read text.

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INTRODUCTION: developmental dyslexia is characterized by impairment in reading and writing of simple words often involving deficits in phonological decoding and spelling. It affects individuals without sensory disabilities, free of significant emotional commitment and adequate educational opportunities. OBJECTIVE: to characterize the performance in activities related to writing observed in children with developmental dyslexia. METHOD: a total of six children (boys and girls) from 3rd to 7th grade from public schools in a city in the state of Sao Paulo, eight to thirteen years of age, participated in this study. Data were collected in CEES - Centro de Estudos de Educação e Saúde of UNESP - in Marília -SP in writing tasks. The results were analyzed descriptively by the score in percentage of correct answers. RESULTS: children with developmental dyslexia presented alterations in relation to the activities: writing of isolated words and writing of dictated words were below expectations for the education level, presenting phonological and orthographic changes. CONCLUSION: it is important that children with school problems make a more specific evaluation concerning these tasks.

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The cataloging process, is responsible for building systems consisting of sets of interconnected elements and combined forms of representation, creating tools to facilitate the flow of information in various informational environments. It presents structures that offer favorable conditions for access to formal codes of symbolic representation and to the channels of information transfer, performing with competence the decoding and encoding of codes and rules used to represent knowledge and to describe information, documents and resources. The objective of this paper is to present the challenge of transforming operational data into consistent information, the role of the forms of representation and the mental constructions for defining the memory markers of users of catalogs. It shows as results the memory markers indicated by three categories of users for the description of a book like resource and points to the need of collaborative and cooperative work in cataloging and to the need of catalog modelling focused on the user.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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The Auditory Evoked Middle Latency Response is one of the most promising objective tests in audiology and in revealing brain dysfunction and neuro-audiologic findings. The main advantages of its clinical use are precision and objectivity in evaluating children. This study aimed to analyze the auditory evoked middle latency response in two patients with auditory processing disorder and relate objective and behavioral measures. This case study was conducted in 2 patients (P1 = 12 years, female, P2 = 17 years old, male), both with the absence of sensory abnormalities, neurological and neuropsychiatric disorders. Both were submitted to anamnesis, inspection of the external ear canal, hearing test and evaluation of Auditory Evoked Middle latency Response. There was a significant association between behavioral test and objectives results. In the interview, there were complaints about the difficulty in listening in a noisy environment, sound localization, inattention, and phonological changes in writing and speaking, as confirmed by evaluation of auditory processing and Auditory Evoked Middle Latency Response. Changes were observed in the right decoding process hearing in both cases on the behavioral assessment of auditory processing; auditory evoked potential test middle latency shows that the right contralateral via response was deficient, confirming the difficulties of the patients in the assignment of meaning in acoustic information in a competitive sound condition at right, in both cases. In these cases it was shown the association between the results, but there is a need for further studies with larger sample population to confirm the data.

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This work focuses on the study of video compression standard MPEG. To this end, a study was undertaken starting from the basics of digital video, addressing the components necessary for the understanding of the tools used by the video coding standard MPEG. The Motion Picture Experts Group (MPEG) was formed in the late '80s by a group of experts in order to create international standards for encoding and decoding audio and video. This paper will discuss the techniques present in the video compression standard MPEG, as well as its evolution. Will be described in the MPEG-1, MPEG-2, MPEG-4 and H.264 (MPEG-4 Part 10), however, the last two will be presented with more emphasis, because the standards are present in most modern video technologies, as in HDTV broadcasts

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Overall, in Brazilian schools, the concept of reading does not take into account its possibilities and its meaning for life. But read is assigning meaning to something , make sense, interact with the text read. Thus, the present study addresses the mechanical reading, that without contextualization, performed on a technique by joining letters and syllables loose and also reading social use, consisting of statements, dialogism , polyphony and heteroglossy. It is known that the mechanical reading brings undesirable consequences, including learning problems, such as lack of attention, concentration, memory, imagination. When the reading is taught in a systematic way, with only the goal of the code decoding of written language, destroys social perspectives and intellectual development. It is common, when you offer the children a book, there the difficult disinterest of textual interpretation, because there is no attribute meaning to the content, and even the ability to interact with the text. With the interest in studying the dialogic reading this and the statements and genres, the present study was based on several authors: Bakhtin (1988, 2000), Schneuwly and Dolz (2000), Faraco (2009) and Ponzio (2009) Jolibert (1994), Bajard (2002; 2007) Foucambert (1997) Martins ( 1985) and Smith ( 1999). Aim for this study the following research question: what are the contributions of Mikhail Bakhtin's theory to the teaching of reading from kindergarten through the first grade of elementary school? Our hypothesis is that if they are guaranteed to pre -school and elementary school beginners diversified materials and new approaches in teaching reading and encouragement to her, will be developed in children a taste for the act of reading, so that they can assign meaning and significance, making reading part of their lives...

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This study establishes that for a given binary BCH code C0 n of length n generated by a polynomial g(x) ∈ F2[x] of degree r there exists a family of binary cyclic codes {Cm 2m−1(n+1)n}m≥1 such that for each m ≥ 1, the binary cyclic code Cm 2m−1(n+1)n has length 2m−1(n + 1)n and is generated by a generalized polynomial g(x 1 2m ) ∈ F2[x, 1 2m Z≥0] of degree 2mr. Furthermore, C0 n is embedded in Cm 2m−1(n+1)n and Cm 2m−1(n+1)n is embedded in Cm+1 2m(n+1)n for each m ≥ 1. By a newly proposed algorithm, codewords of the binary BCH code C0 n can be transmitted with high code rate and decoded by the decoder of any member of the family {Cm 2m−1(n+1)n}m≥1 of binary cyclic codes, having the same code rate.

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A Goppa code is described in terms of a polynomial, known as Goppa polynomial, and in contrast to cyclic codes, where it is difficult to estimate the minimum Hamming distance d from the generator polynomial. Furthermore, a Goppa code has the property that d ≥ deg(h(X))+1, where h(X) is a Goppa polynomial. In this paper, we present a decoding principle for Goppa codes constructed by generalized polynomials, which is based on modified Berlekamp-Massey algorithm.

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In this paper, we introduced new construction techniques of BCH, alternant, Goppa, Srivastava codes through the semigroup ring B[X; 1 3Z0] instead of the polynomial ring B[X; Z0], where B is a finite commutative ring with identity, and for these constructions we improve the several results of [1]. After this, we present a decoding principle for BCH, alternant and Goppa codes which is based on modified Berlekamp-Massey algorithm. This algorithm corrects all errors up to the Hamming weight t ≤ r/2, i.e., whose minimum Hamming distance is r + 1.