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Tesis sobre el tema "Communication errors"
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Mercier, Hugues. "Communication over channels with symbol synchronization errors". Thesis, University of British Columbia, 2008. http://hdl.handle.net/2429/904.
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Synchronization is a problem of fundamental importance for a wide range of practical communication systems including reading media, multi-user optical channels, synchronous digital communication systems, packet-switched communication networks, distributed computing systems, etc. In this thesis I study various aspects of communication over channels with symbol synchronization errors.
Symbol synchronization errors are harder to model than erasures or substitution errors caused by additive noise because they introduce uncertainties in timing. Consequently, the capacity of channels subjected to synchronization errors is a very challenging problem, even when considering the simplest channels for which only deletion errors occur. I improve on the best existing lower and upper bounds for the capacity of the deletion channel using convex and stochastic optimization techniques. I also show that simply finding closed-form expressions for the number of subsequences when deleting symbols from a string is computationally prohibitive.
Constructing efficient synchronization error-correcting codes is also a challenging task. The main result of the thesis is the design of a new family of codes able to correct several types of synchronization errors. The codes use trellis and modified versions of the Viterbi decoding algorithm, and therefore have very low encoding and decoding complexities. They also have high data rates and work for reasonably noisy channels, which makes them one of the first synchronization-correcting codes that have any chance of being used in practical systems.
In the last part of the thesis, I show that a synchronization approach can solve the opportunistic spectrum access problem in cognitive radio, where cognitive users want to communicate in presence of legacy users to whom the bandwidth has been licensed. I also consider the amount of communication required to solve a large class of distributed problems where synchronization errors can occur. More precisely, I study how allowing the parties to solve the problems incorrectly with small probability can reduce the total amount of communication or the number of messages that need to be exchanged.
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FERNANDES, MARCUS VINICIUS DOS SANTOS. "MODELING OF DIGITAL COMMUNICATION CHANNELS UNDER BURST OF ERRORS". PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2010. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=32818@1.
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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIROCOORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
INSTITUTO DE PESQUISA E DESENVOLVIMENTO
PROGRAMA DE EXCELENCIA ACADEMICA
A ocorrência de erros em surto é observada principalmente em canais sem fio. Para a análise e melhor entendimento deste tipo de erro, a fim de se melhorar os projetos de sistemas de comunicações digitais, uma modelagem mais precisa, de canais com esta característica, torna-se necessária. Uma diversidade de métodos de estimação de parâmetros tem sido estudada, principalmente aquelas baseadas nos Modelos Escondidos de Markov (HMM do ingês). Em geral cada método é focado em um sistema de comunicações específico, sobre uma camada específica. Neste trabalho é proposto um novo método baseado em um HMM com uma estrutura particular, que permite a dedução de expressões analíticas para todas as estatísticas de interesse. A estrutura do modelo proposto permite a geração de eventos que ocorrem numa sequência binária de dados sujeita a surtos de erro, de acordo com a definição de surtos de erro do CCITT. O modelo proposto possui um número fixo de apenas sete parâmetros, mas o seu número de estados cresce com um de seus parâmetros, que aumenta a precisão, mas não a complexidade. Este trabalho adotou técnicas de otimização, associadas aos métodos de Máxima Verossimilhança e Particle Swarm Optimization (PSO) a fim de realizar a estimação dos parâmetros do modelo proposto. Os resultados demonstram que o modelo proposto permite a caracterização precisa de canais com memória de diversas origens.
The occurrence of error busts is mainly observed in wireless channels. For analysis and a better understanding of such errors, in order to improve the design of communication systems, an accurate modeling of channels with this characteristic is necessary. A lot of parameter estimation methods have been studied, mainly the ones based on Hidden Markov Models (HMM). In general each method is focused in a specific communication system, on a specific layer. In this work it is proposed a new method based on a HMM with particular structure that allows the deduction of analytical expressions for all statistics of interest. The structure of the proposed model permits the generation of events that occur in a binary data sequence subject to bursts of error concerning CCITT error burst definition. The proposed model has a fixed number of only seven parameters but its number of states increase with one of those parameters that increase the accuracy but not the complexity. This work adopted techniques of optimization associated to Maximum Likelihood (ML) and Particle Swarm Optimization (PSO) to perform the parameter estimation to the proposed model. The results show that the proposed model achieves accurate characterization of channels with memory from many different sources.
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MacDonald, Lightbound Penelope. "An Analysis of Interlanguage Errors in Synchronous/Asynchronous Intercultural Communication Exchanges". Doctoral thesis, Universitat de València, 2004. http://hdl.handle.net/10803/9786.
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This study deals with the computer-aided analysis of interlanguage errors made by the participants in intercultural telematic simulations involving university students and professionals from five European countries. The simulation involves the participants in producing a large amount of written discourse, all in English, which is composed and sent via computers as either synchronous or asynchronous communication. Using the Error Tagging Method and Error Editor developed by the Centre for English Corpus Linguistics at the Université Catholique de Louvain in Belgium, the interlanguage errors, as regards the morphological and lexical aspects, were identified, classified and tagged, while the corrected versions of the deviant forms were added. The following research questions were formulated:1. Are there more errors in the synchronous or asynchronous mode of communication?2. Is there a difference in the type of error to be found in each mode of communication3. Do the different groups have more errors of some types than others?4. Do the different groups make errors that can be associated with their particular first language (L1), in other words, does the L1 influence the type of error predominant in any one group?5. Looking in greater detail at the Spanish participants' output we enquired which errors were salient in these subjects?6. Can we identify the causes of these salient errors in the Spanish L1 group?In the section referring to the theoretical background to our research work, we begin by making reference to the interrelationship of the different functions of language depending on the contextual situation of the communicative event, in our case, as observed in the telematic simulations. We then focus on the notions of communicative competence, and error, from both a historical perspective and with regard to their significance in English as a Foreign Language teaching. The role of Information and Communication Technology in language teaching pedagogy finalises the first section of the thesis.The corpus comprised 42,059 words in the synchronous mode, and 42,625 words in the asynchronous mode.A Correspondence Analysis was carried out with the aim of verifying the relative incidence of error types according to the L1 of the participants by investigating the different variables and their effect on the type and frequency of the errors, depending on the mode of communication. As regards the answers to the research questions formulated, there were indeed more errors in the synchronous mode of communication than the asynchronous, as we hypothesised, although when examining the exact types of errors, some categories were more frequent in the synchronous mode (the formal and grammatical errors, among others), while in the asynchronous, errors of style and lexis were higher. A further analysis of the data revealed that the frequency of error types varied with each different L1 group participating in the simulation, and when the Correspondence Analysis was carried out, this showed that highly relevant associations could be established as regards the relation between participants' L1 and specific error types. After examining the results, we concluded that the L1 of the learners does in fact influence the type of error made. Following this comparative analysis of interlanguage output, we focused on the errors in the corpus made by the Spanish L1 group, classifying them, and commenting on their nature and frequency. The results obtained revealed that mother tongue interference appears to be the cause of a significant number of errors in the formal and lexical categories.La investigación que se llevó a cabo en la elaboración de esta tesis presenta el objetivo fundamental de abordar un análisis exhaustivo de los errores interlingua acaecidos en un tipo de comunicación intercultural donde el discurso es de tipo síncrono -en tiempo real- y, asíncrono -en tiempo diferido. El corpus analizado procede de la comunicación escrita entre grupos multidisciplinares que participan en una simulación telemática -a distancia- a nivel internacional. Los sujetos participantes proceden de cinco universidades europeas localizadas en Noruega, Latvia, Alemania, Francia y España. El estudio demuestra que existen ciertos tipos de errores que se repiten con mayor frecuencia, dependiendo del modo de comunicación. De igual modo, indica que hay categorias de errores que se dan con mayor frecuencia dependiendo de la lengua materna de los sujetos participantes en la simulación. Por último, se llevó a cabo un sub-análisis de los sujetos españoles, cuyo resultado demuestra que la interferencia de la lengua materna es una de las causas principales de los errores formales y léxicos de este grupo de participantes
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Lemer, Claire. "An Examination of the Role of Communication in Paediatric Medication Errors". Thesis, University College London (University of London), 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.498727.
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Martwick, Andrew Wayne. "Clock Jitter in Communication Systems". PDXScholar, 2018. https://pdxscholar.library.pdx.edu/open_access_etds/4375.
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For reliable digital communication between devices, the sources that contribute to data sampling errors must be properly modeled and understood. Clock jitter is one such error source occurring during data transfer between integrated circuits. Clock jitter is a noise source in a communication link similar to electrical noise, but is a time domain noise variable affecting many different parts of the sampling process. Presented in this dissertation, the clock jitter effect on sampling is modeled for communication systems with the degree of accuracy needed for modern high speed data communication. The models developed and presented here have been used to develop the clocking specifications and silicon budgets for industry standards such as PCI Express, USB3.0, GDDR5 Memory, and HBM Memory interfaces.
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Wiggins, Khalyn I. "Spelling Errors in Children with Autism". Scholar Commons, 2010. http://scholarcommons.usf.edu/etd/3475.
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The goal of this study was to examine the spelling errors of children with Autism Spectrum Disorder (ASD) when asked to spell morphologically complex words. Specifically, this study sought to determine if percent accuracy across morphological areas would be similar to patterns noted in typical developing children, correlate with participant age, and correlate to performance on standardized measures of achievement. Additionally, the study wanted to highlight the types of errors made by children with ASD on homonyms and the specific linguistic patterns noted when spelling derivational and inflectional word types.
Participants included 29 children diagnosed with Autism, PDD-NOS, and Asperger’s Disorder, ages 8-15 years. The spelling protocol consisted of 36 words differing in morphological complexity, including homonyms, inflections and derivations. The derivational categories included: no shift, orthographic shift, phonologic shift, and orthographic + phonologic shift words (Carlisle, 2000). Spelling errors were analyzed both quantitatively and qualitatively. The qualitative analysis used a unique coding system, the Phonological, Orthographic, and Morphological Analysis of Spelling (POMAS; Silliman et al., 2006), which identified both the linguistic category of an error, as well as the specific linguistic feature in error.
Results indicated that the spelling errors of children with ASD seemed to follow a developmental pattern that was similar to typically developing children (Carlisle, 1988; 2000). To be specific, phonologic and orthographic+phonologic shift categories evidenced significantly more errors than the no shift, orthographic shift, and inflections categories, which were not significantly different from each other. As expected, academic achievement, as measured by letter-word decoding, spelling, and age, were correlated with morphological spelling ability.
Findings supported the use of the POMAS as a coding measure sensitive to spelling error patterns found in children with ASD. Several common feature errors emerged including: 1) vowel errors, 2) consonant deletions, 3) letter doubling, 4) derivational suffix errors, and 5) whole word substitutions. Overall, this heterogeneous group of spellers fit into three profiles of spelling ability: 1) competent spelling ability, 2) morphologically challenged spellers, and
3) generally challenged spellers. Hence, qualitative investigations of spelling errors play a crucial part in the characterization of spelling skill in children with ASD.
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Niestepski, Michelle Jean. "Grammatical errors : perceptions and responses of students, first-year composition instructors, and business coomunication instructors /". View online ; access limited to URI, 2008. http://0-digitalcommons.uri.edu.helin.uri.edu/dissertations/AAI3314446.
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Hassanzadeh, Nezami Setareh. "A Study of Errors, Corrective Feedback and Noticing in Synchronous Computer Mediated Communication". Thesis, Linköpings universitet, Avdelningen för språk och kultur, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-88411.
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This study investigated the different types of errors that EFL learners produce in chat logs and also analyzed the different types of corrective feedback given by the teacher. An eye tracker was employed to study the eye movements of the participants to see how they notice the corrective feedback. This investigation can assist teachers to act better in online classrooms and helps them understand which type of corrective feedback is most likely to result in uptake based on noticing. The results showed that the most common errors in chat logs were related to grammar. It was also found that both recasts and metalinguistic feedback were noticed most of the time during the chat sessions although only a few of them led to uptake in post task session.
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Wennerström, Hjalmar. "Meteorological impact and transmission errors in outdoor wireless sensor networks". Licentiate thesis, Uppsala universitet, Avdelningen för datorteknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-227639.
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Wireless sensor networks have been deployed outdoors ever since their inception. They have been used in areas such as precision farming, tracking wildlife, and monitoring glaciers. These diverse application areas all have different requirements and constraints, shaping the way in which the sensor network communicates. Yet something they all share is the exposure to an outdoor environment, which at times can be harsh, uncontrolled and difficult to predict. Therefore, understanding the implications of an outdoor environment is an essential step towards reliable wireless sensor network operations. In this thesis we consider aspects of how the environment influence outdoor wireless sensor networks. Specifically, we experimentally study how meteorological factors impact radio links, and find that temperature is most significant. This motivates us to further study and propose a first order model describing the impact of temperature on wireless sensor nodes. We also analyze transmission errors in an outdoor wireless sensor networks, identifying and explaining patterns in the way data gets corrupted. The findings lead to a design and evaluation of an approach for probabilistic recover of corrupt data in outdoor wireless sensor networks. Apart from the experimental findings we have conducted two different outdoor deployments for which large data sets has been collected, containing both link and meteorological measurements.WISENET
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Clopton, Sara L. "Articulation Errors in Childhood Apraxia of Speech". Case Western Reserve University School of Graduate Studies / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=case1212505684.
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Varughese, Suma. "A Study On Effects Of Phase - Amplitude Errors In Planar Near Field Measurement Facility". Thesis, Indian Institute of Science, 2000. http://hdl.handle.net/2005/231.
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Antenna is an indispensable part of a radar or free space communication system. Antenna requires different stringent specifications for different applications. Designed and fabricated for an intended application, antenna or antenna array has to be evaluated for its far-field characteristics in real free space environment which requires setting up of far-field test site. Maintenance of the site to keep the stray reflections levels low, the cost of the real estate are some of the disadvantages.
Nearfield measurements are compact and can be used to test the antennas by exploiting the relationship between near-field and far-field. It is shown that the far-field patterns of an antenna can be sufficiently accurately predicted provided the near-field measurements are accurate. Due to limitation in the near-field measurement systems, errors creep in corrupting the nearfield-measured data thus making error in prediction of the far field. All these errors ultimately corrupt the phase and amplitude data.
In this thesis, one such near-field measurement facility, the Planar Near Field Measurement facility is discussed. The limitations of the facility and the errors that occur due to their limitations are discussed. Various errors that occur in measurements ultimately corrupt the near-field phase and amplitude. Investigations carried out aim at a detailed study of these phase and amplitude errors and their effect on the far-field patterns of the antenna. Depending on the source of error, the errors are classified as spike, pulse and random errors. The location of occurrence of these types of errors in the measurement plane, their effects on the far-field of the antenna is studied both for phase and amplitude errors.
The studies conducted for various phase and amplitude errors show that the near-field phase and amplitude data are more tolerant to random errors as the far-field patterns do not get affected even for low sidelobe cases. The spike errors, though occur as a wedge at a single point in the measurement plane, have more pronounced effect on the far-field patterns. Lower the taper value of the antenna, more pronounced is the error. It is also noticed that the far-field pattern gets affected only in the plane where the error has occurred and has no effect in the orthogonal plane. Pulse type of errors which occur even for a short length in the measurement affect both the principle plane far-field patterns.
This study can be used extensively as a tool to determine to the level to which various error such as mechanical, RF etc need to be controlled to make useful and correct pattern predictions on a particular facility. Thereby, the study can be used as a tool to economise the budget of the facility wherein the parameters required for building the facility need not be over specified beyond the requirement. In general, though this is a limited study, it is certainly a trendsetter in this direction.
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Skaria, Rinku Saju. "Medical Errors in the Operating Room Attributable to Communication Breakdown and its Effects on Patient Safety". Thesis, The University of Arizona, 2014. http://hdl.handle.net/10150/321958.
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Prabhu, Parrikar Utpal M. "On SNR aware analysis and modeling of 802.11b link-level residual errors". Diss., Connect to online resource - MSU authorized users, 2006.
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Thesis (M.S.)--Michigan State University. Dept. of Electrical and Computer Engineering, 2006.Title from PDF t.p. (viewed on Oct. 30, 2009) Includes bibliographic references (p. 46-47). Also issued in print.
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Lockhart, Jennifer Lynn. "The type and frequency of morphosyntax errors in children's narratives". [Johnson City, Tenn. : East Tennessee State University], 2004. http://etd-submit.etsu.edu/etd/theses/available/etd-0326104-115425/unrestricted/LockhartJ041604f.pdf.
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Thesis (M.S.)--East Tennessee State University, 2004.Title from electronic submission form. ETSU ETD database URN: etd-0326104-115425. Includes bibliographical references. Also available via Internet at the UMI web site.
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Dobler, Rodrigo Jaureguy. "FITT : fault injection test tool to validate safety communication protocols". reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2016. http://hdl.handle.net/10183/143198.
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Protocolos de comunicação seguros são essenciais em ambientes de automação industrial, onde falhas não detectadas na comunicação de dispositivos podem provocar danos irreparáveis à vida ou ao meio-ambiente. Esses protocolos seguros devem ser desenvolvidos de acordo com alguma norma de segurança, como a IEC 61508. Segundo ela, faz parte do processo de implementação destes protocolos, a escolha de técnicas adequadas de validação, entre elas a injeção de falhas, a qual deve considerar um modelo de falhas apropriado ao ambiente de operação do protocolo. Geralmente, esses ambientes são caracterizados pela existência de diversas formas de interferência elétrica e eletromagnética, as quais podem causar falhas nos sistemas eletrônicos existentes. Nos sistemas de comunicação de dados, isto pode levar a destruição do sinal de dados e causar estados de operação equivocados nos dispositivos. Assim, é preciso utilizar uma técnica de injeção de falhas que permita simular os tipos de erros de comunicação que podem ocorrer nos ambientes industriais. Dessa forma, será possível verificar o comportamento dos mecanismos de tolerância falhas na presença de falhas e assegurar o seu correto funcionamento. Para esta finalidade, este trabalho apresenta o desenvolvimento do injetor de falhas FITT para validação de protocolos de comunicação seguros. Esta ferramenta foi desenvolvida para ser utilizada com o sistema operacional Linux. O injetor faz uso do PF_RING, um módulo para o Kernel do Linux, que é responsável por realizar a comunicação direta entre as interfaces de rede e o injetor de falhas. Assim os pacotes não precisam passar pelas estruturas do Kernel do Linux, evitando que atrasos adicionais sejam inseridos no processo de recebimento e envio de mensagens. As funções de falhas desenvolvidas seguem o modelo de falhas de comunicação descrito na norma IEC 61508. Esse modelo é composto pelos erros de repetição, perda, inserção, sequência incorreta, endereçamento, corrupção de dados, atraso, mascaramento e falhas de memória em switches.Safe communication protocols are essential in industrial automation environments, where undetected failures in the communication of devices can cause irreparable damage to life or to the environment. These safe protocols must be developed according to some safety standard, like IEC 61508. According to it, part of the process of implementing these protocols is to select appropriate techniques for validation, including the fault injection, which should consider an appropriate fault model for the operating environment of the protocol. Generally, these environments are characterized by the existence of various forms of electric and electromagnetic interference, which can cause failures in existing electronic systems. In data communication systems, this can lead to the destruction of the data signal and cause erroneous operation states in the devices. Thus, it is necessary to use a fault injection technique that allows simulating the types of communication errors that may occur in industrial environments. So, it will be possible to verify the behavior of the fault tolerance mechanisms in the presence of failures and ensure its correct functioning. For this purpose, this work presents the development of FITT fault injector for validation of safety communication protocols. This tool was developed to be used with Linux operating system. The fault injector makes use of PF_RING, a module for the Linux Kernel and that is responsible to perform the direct communication between the network interfaces and the fault injector. Thus the packages do not need to go through the Linux Kernel structures, avoiding additional delays to be inserted into the process of receiving and sending messages. The developed fault injection functions follow the communication fault model described in the IEC61508 standard, composed by the errors of repetition, loss, insertion, incorrect sequence, addressing, data corruption, delay, masking and memory failures within switches. The fault injection tests applied with this model allow to properly validate the fault tolerance mechanisms of safety protocols.
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Duman, Benjamin. "The root causes of errant ordered radiology exams". [Boise, Idaho] : Boise State University, 2009. http://scholarworks.boisestate.edu/td/79/.
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Nisar, Muhammad Mudassar. "Robust low-power signal processing and communication algorithms". Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/33872.
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This thesis presents circuit-level techniques for soft error mitigation, low-power design with performance trade-off, and variation-tolerant low-power design. The proposed techniques are divided into two broad categories. First, error compensation techniques, which are used for soft error mitigation and also for low-power operation of linear and non-linear filters. Second, a framework for variation tolerant low-power operation of wireless devices is presented. This framework analyzes the effects of circuit "tuning knobs" such as voltage, frequency, wordlength precision, etc. on system performance, and power efficiency. Process variations are considered as well, and the best operating tuning knob levels are determined, which results in maximum system wide power savings while keeping the system performance within acceptable limits. Different methods are presented for variation-tolerant and power-efficient wireless communication. Techniques are also proposed for application driven low-power operation of the OFDM baseband receiver.
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Taylor-Hyde, Dr Mary Ellen. "Human Resource Strategies for Improving Organizational Performance to Reduce Medical Errors". ScholarWorks, 2017. https://scholarworks.waldenu.edu/dissertations/3580.
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Preventable medical errors are the third leading cause of death in the United States. Healthcare leaders must consistently promote the delivery of quality and safe care of patients to reduce unnecessary errors and prevent harm. The purpose of this case study was to explore human resource strategies for improving organizational performance to reduce medical errors. The study included face-to-face interviews with 5 healthcare clinical managers who work within a multifaceted health system in the Midwestern region of the United States. Complex adaptive systems theory was used to frame this study. Interview notes, publicly available documents, and audio recordings were transcribed and analyzed to identify themes regarding strategies used by managers to find effective ways for improvement. Four themes emerged: addressing seminal/never events, ongoing training programs, communication/collaboration, and promoting a culture of safety and quality. Results may directly benefit healthcare managers by facilitating successful strategies to reduce preventable medical errors through education, feedback, innovation, and leadership. Implications for social change for healthcare managers include continued training, building a culture of safety, and using collaborative and communicative efforts while making contributions to the best practices within healthcare organizations to reduce the likelihood of medical errors.
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Mills, Pamela Ruth. "Hospital electronic prescribing and medicines administration system implementation into a district general hospital : a mixed method evaluation of discharge communication". Thesis, Robert Gordon University, 2016. http://hdl.handle.net/10059/1581.
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Hospital electronic prescribing and medicines administration (HEPMA) system implementation is advocated by national e-health strategies to produce patient safety benefits. No previous study has evaluated HEPMA implementation impacting discharge information communication or assessed discharge prescribing errors. The aims were to assess HEPMA system implementation impact on medicines related discharge communication and prescribing errors, and to gain the perspective of hospital staff involved in the communication process. Following a narrative literature review, a convergent parallel mixed methods was selected, consisting of interpretative phenomenology and experimental before and after study design. Face-to-face semi-structured interviews of a purposive sample of hospital staff involved in discharge information communication were undertaken using the Theoretical Domains Framework (TDF) as a theoretical lens. In addition a quasi experimental retrospective case notes review, both before and after implementation was completed. Pre-implementation, staff described patient safety concerns with traditional discharge communication processes. They cited frequent prescribing errors, and associated adverse events and hospital readmissions. HEPMA implementation was anticipated to improve patient safety and create more efficient discharge communication. Post-implementation staff articulated improved information quality highlighting fewer omitted medicines and improved patient safety. TDF findings of behaviour change highlighted behavioural alteration including adaption of processes to improve discharge quality. Quantitative data collection (n=159 before and after) confirmed qualitative findings; increased compliance with discharge documentation, for example staff grade recorded increased from 40% to 100% (p<0.001). Prescribing error quantity and severity were reduced; errors reduced from 99% to 23% of patients (p<0.001); only 22% of identified errors likely to cause harm. Omitted medicines decreased from 42% to 11% of patients (p<0.001). The findings contribute original knowledge concerning HEPMA implementation impacting discharge information communication and prescribing errors. The study demonstrated reduced prescribing errors and improved patient safety which potentially impacted health and wellbeing. Qualitative findings and quantitative results are transferable and applicable to other NHS organisations or similar healthcare settings.
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Irshad, Yasir. "On some continuous-time modeling and estimation problems for control and communication". Doctoral thesis, Karlstads universitet, Institutionen för ingenjörsvetenskap och fysik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-26129.
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The scope of the thesis is to estimate the parameters of continuous-time models used within control and communication from sampled data with high accuracy and in a computationally efficient way.In the thesis, continuous-time models of systems controlled in a networked environment, errors-in-variables systems, stochastic closed-loop systems, and wireless channels are considered. The parameters of a transfer function based model for the process in a networked control system are estimated by a covariance function based approach relying upon the second order statistical properties of input and output signals. Some other approaches for estimating the parameters of continuous-time models for processes in networked environments are also considered. The multiple input multiple output errors-in-variables problem is solved by means of a covariance matching algorithm. An analysis of a covariance matching method for single input single output errors-in-variables system identification is also presented. The parameters of continuous-time autoregressive exogenous models are estimated from closed-loop filtered data, where the controllers in the closed-loop are of proportional and proportional integral type, and where the closed-loop also contains a time-delay. A stochastic differential equation is derived for Jakes's wireless channel model, describing the dynamics of a scattered electric field with the moving receiver incorporating a Doppler shift.The thesis consists of five main parts, where the first part is an introduction- Parts II-IV are based on the following articles:
Part II - Networked Control Systems
1. Y. Irshad, M. Mossberg and T. Söderström. System identification in a networkedenvironment using second order statistical properties.
A versionwithout all appendices is published as Y. Irshad, M. Mossberg and T. Söderström. System identification in a networked environment using second order statistical properties. Automatica, 49(2), pages 652–659, 2013.
Some preliminary results are also published as M. Mossberg, Y. Irshad and T. Söderström. A covariance function based approachto networked system identification. In Proc. 2nd IFAC Workshop on Distributed Estimation and Control in Networked Systems, pages 127–132, Annecy,France, September 13–14, 2010
2. Y. Irshad and M. Mossberg. Some parameters estimation methods applied tonetworked control systems.A journal submission is made. Some preliminary results are published as Y. Irshad and M. Mossberg. A comparison of estimation concepts applied to networked control systems. In Proc. 19th Int. Conf. on Systems, Signals andImage Processing, pages 120–123, Vienna, Austria, April 11–13, 2012.
Part III - Errors-in-variables Identification
3. Y. Irshad and M. Mossberg. Continuous-time covariance matching for MIMOEIV system identification. A journal submission is made.
4. T. Söderström, Y. Irshad, M. Mossberg and W. X. Zheng. On the accuracy of acovariance matching method for continuous-time EIV identification. Provisionally accepted for publication in Automatica.
Some preliminary results are published as T. Söderström, Y. Irshad, M. Mossberg, and W. X. Zheng. Accuracy analysis of a covariance matching method for continuous-time errors-in-variables system identification. In Proc. 16th IFAC Symp. System Identification, pages 1383–1388, Brussels, Belgium, July 11–13, 2012.
Part IV - Wireless Channel Modeling
5. Y. Irshad and M. Mossberg. Wireless channel modeling based on stochasticdifferential equations .Some results are published as M. Mossberg and Y. Irshad. A stochastic differential equation forwireless channelsbased on Jakes’s model with time-varying phases, In Proc. 13th IEEEDigitalSignal Processing Workshop, pages 602–605, Marco Island, FL, January4–7, 2009.
Part V - Closed-loop Identification
6. Y. Irshad and M. Mossberg. Closed-loop identification of P- and PI-controlledtime-delayed stochastic systems.Some results are published as M. Mossberg and Y. Irshad. Closed-loop identific ation of stochastic models from filtered data, In Proc. IEEE Multi-conference on Systems and Control,San Antonio, TX, September 3–5, 2008
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Herrán, Stålenbring Jessika. "Corrección de errores en la clase de ELE : Un estudio de la actitud de los alumnos y los profesores hacia la corrección de los errores cometidos en la producción oral en el bachillerato sueco". Thesis, Linnéuniversitetet, Institutionen för språk (SPR), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-99198.
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The present study is an investigation of the correction of the errors made by the pupils when speaking Spanish as a foreign language (ELE) in Swedish High School, in order to make clear how the teacher works with the oral communicative approach, without forgetting the importance of correction. We study the attitudes of teachers and pupils towards correction. We also examinate what are the mistakes that teachers correct and why do they correct these errors while not others. Another question that we seek the answer to is when the teacher corrects the mistakes made by the students during the learning process of ELE. We also study in what situation the teacher corrects the grammatical errors made by the students when speaking. Our hypothesis is that the mistakes that the teacher corrects are the most common ones and those that make it impossible for the communication to progress. We believe that the attitude of the teachers toward the mistakes made by the students is positive, since they know that with the help of the mistakes made, they can discover where the students are in the development of their learning. On the other hand, we think that the attitude of the students is not positive, because they believe it’s embarrassing to make a mistake. Teachers correct mistakes carefully, because they place emphasis on communication, and the importance of expressing oneself correctly is in second place, and the teacher wants to prevent the pupils from being afraid to speak. In order to answer our questions reliably, we use two sources: questionnaires and interviews. 142 pupils and six teachers from three schools are surveyed in the region of Kronoberg and the region of Jönköping. We also interview five of these same teachers and thirteen pupils of the groups already mentioned. The result of the study shows that the teachers and the pupils have a positive attitude towards the correction of the errors made while speaking Spanish. It also shows that the teachers correct only the errors that make it impossible to understand what the pupil wants to say. Also, the research gets the result that the teachers don’t use the CEFR when they are about to correct the errors made by the pupils while they speak Spanish. The teachers don’t correct all the errors made, but often react immediately and make corrections in front of the group.
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Vale, Pamela. "Describing the relationship between the cognitive and linguistic complexity of a mathematical literacy examination and types of student errors". Thesis, Rhodes University, 2013. http://hdl.handle.net/10962/d1001774.
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Much prior research has shown that if students have a poor command of the language in which they are taught and assessed, they experience a complex and deep learning disadvantage (Barton & Neville-Barton, 2003). Abedi (2006) mentions, in particular, that unnecessary linguistic complexity can threaten the validity of examination items and thus compromises the fairness of the assessment for English language learners. In Clarkson’s (1991, p. 31) research it was found that for the English language learners in the study “comprehension errors [made] up a high proportion of the errors made when…students attempt[ed] to solve mathematical word problems”. In an attempt to explore whether this was the case for a group of National Certificate (Vocational) [NC(V)] students at an FET college, the research conducted in this study focused on describing the cognitive and linguistic complexity of Level 4 Mathematical Literacy examination items as well as the types of responses from a sample of students. A mixed-methods case study design was selected. Student errors were classified as either due to mathematical literacy-related sources, or language-related sources and the question was asked as to how the cognitive and linguistic complexity of items might be related to the types of errors made. Statistically significant correlations were found between the linguistic complexity of items and language-related errors, and between the cognitive complexity of items and all types of errors. It was also possible to identify which language features, in particular, were statistically significantly correlated with linguistic complexity, namely: prepositional phrases; words of 7 letters or more and complex/compound sentences. As was expected, the majority of errors were categorised as mathematical literacy-related. However, as many as 19.22% of all errors made were identified as language-related. While the scope of the study prevents any generalisations from being made, the results indicate a need for a larger-scale study of this nature to determine if the complex and deep learning disadvantage mentioned by Barton and Neville-Barton (2003) does exist with regard to the assessment of Mathematical Literacy for NC(V) students who are English language learners (Barton & Neville-Barton, 2003).
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Alves, Sofia Alexandra Micaelo. "Plano de comunicação integrada de marketing para um Laboratório de Análises Clínicas". Master's thesis, Instituto Superior de Economia e Gestão, 2013. http://hdl.handle.net/10400.5/11086.
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Mestrado em MarketingO principal objetivo da Comunicação Integrada de Marketing é juntar todas as ferramentas de marketing e comunicar de forma clara e consistente para que a empresa possa alcançar o público pretendido. Este Plano de Comunicação Integrada de Marketing destina-se a apresentar à população todos os serviços, conhecimento e tecnologia de que dispõe o Laboratório de Análises Clínicas da Faculdade Farmácia da Universidade de Lisboa. Pretende-se aumentar a notoriedade do laboratório bem como a preferência pelo mesmo. Para alcançar este objetivo recorre-se à comunicação interna e junto da comunidade local. Adicionalmente também se pretende comunicar ao nível dos Media, melhorar a comunicação na Internet, aumentar o número de parcerias, organizar eventos e comunicar ao nível da publicidade. Para mensurar os resultados das ações consideram-se indicadores como a quota de mercado, o aumento de utentes no laboratório e um questionário para se compreender de que forma os utentes tomaram conhecimento do laboratório e se ficaram satisfeitos com o serviço que lhes foi prestado.
The main goal of Integrated Marketing Communication is put together all of the marketing tools and communicate the clearest and consistent way that the company can for achieve the people that they want. This Integrated Marketing Communication Plan is meant to present to the population all of the services, knowledge and technology that is at the disposal of the Clinical Analysis Laboratory of the Faculdade de Farmácia - Universidade de Lisboa. It is intended to increase the awareness of the laboratory as well as the preference for the aforementioned one. To reach this goal internal communication tactics and communication with the local community are suggested. It is also intended to communicate with the Media, improving the internet communication, increasing the number of partnerships, organizing events and communicating through publicity. To measure the actions it is planned to take some indicators in consideration as the market share, the increase of users of the laboratory and the level of satisfaction with the service that was provided to them.
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Bowers, Garrett Phyllis Marie. "Using SBAR to Decrease Transfers from the Long-term Care to the Emergency Room". ScholarWorks, 2016. https://scholarworks.waldenu.edu/dissertations/2395.
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Care of the elderly, long-term care resident in the emergency department is an issue of importance because of the overall impact on healthcare costs, potential for negative outcomes for the resident, and the loss of revenue. The purpose of this project was to decrease avoidable transfer of residents to the Emergency Department. Using the Antecedent, Target, Measurement logic model, poor quality assessment data was deemed the antecedent of the avoidable transfer. The goal of the project was the implementation of a standardized process of assessment that would have decreased avoidable transfer of the resident. The project would have involved training of the nursing staff in the use of the Situation Background Assessment and Recommendation tool for collecting and communicating pertinent data. The tool would have been completed at each acute complaint and would have indicated disposition. Data would have been collected by the Education Coordinator and organized for review and comparison with preintervention data. Social change implications would have included enhanced communication, potential for increased nurse and physician satisfaction which could have potentially increased job satisfaction, and improved recruitment and retention. Autonomy and self-pertinence empowers the nurse to be a stronger advocate. Positive outcomes increase when care is provided by those familiar with the patient norms and the setting. Financial savings can have an impact on the cost of healthcare. This project would also have allowed for and encouraged internal review of process and practices. This project was not implemented and so remains inconclusive.
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Carmack, Heather J. "How to Say I'm Sorry: A Study of the Veterans Administration Hospital Association's Apology and Disclosure Program". Ohio : Ohio University, 2008. http://www.ohiolink.edu/etd/view.cgi?ohiou1209039528.
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Psychou, Georgia [Verfasser], Tobias G. [Akademischer Betreuer] Noll, Holger [Akademischer Betreuer] Blume y Tobias [Akademischer Betreuer] Gemmeke. "Stochastic Approaches for Speeding-Up the Analysis of the Propagation of Hardware-Induced Errors and Characterization of System-Level Mitigation Schemes in Digital Communication Systems / Georgia Psychou ; Tobias G. Noll, Holger Blume, Tobias Gemmeke". Aachen : Universitätsbibliothek der RWTH Aachen, 2018. http://d-nb.info/1162503351/34.
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Brothers, Melissa Warner. "Study of a Parent Implemented Language Treatment for Young Children with Cleft Lip and/or Palate". Digital Commons @ East Tennessee State University, 2002. https://dc.etsu.edu/etd/661.
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There is little empirical evidence to indicate the efficacy of early intervention approaches used with young children with cleft lip and/or palate (CLP). The positive effects of a focused stimulation approach have been documented with children having speech and language deficits, although an articulation model has predominated in intervention of young children with CLP. This study examined the effects of a focused stimulation language intervention and a modification of focused stimulation that emphasized stop consonants through overaspiration of stops (Golding-Kushner, 2001). Four mother-child dyads participated in the study. Each mother received training regarding the implementation of the two treatments. The two interventions were counterbalanced among the four dyads and spanned a total of eight weeks in length. Results indicated that both of the treatments increased the vocabulary usage and reduced the number of compensatory articulation errors in the speech of the children.
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Papadakis, Vasilis. "Error detection and error concealment for MPEG2 over communication networks". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0009/MQ39981.pdf.
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Gu, Yuzhou. "Zero-error communication over adder MAC". Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/120387.
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Thesis: M. Eng., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2018.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 53-54).
Adder MAC is a simple noiseless multiple-access channel (MAC), where if users send messages X₁, . . . ,X[subscript h] [epsilon] {0, 1}[superscript n], then the receiver receives Y = X₁ + · · · + X[subscript h] with addition over Z. Communication over the noiseless adder MAC has been studied for more than fifty years. There are two models of particular interest: uniquely decodable code tuples, and B[subscript h]-codes. In spite of the similarities between these two models, lower bounds and upper bounds of the optimal sum rate of uniquely decodable code tuple asymptotically match as number of users goes to infinity, while there is a gap of factor two between lower bounds and upper bounds of the optimal rate of B[subscript h]-codes. The best currently known B[subscript h]-codes for h >/- 3 are constructed using random coding. In this thesis, we study variants of the random coding method and related problems, in hope of achieving B[subscript h]-codes with better rate. Our contribution include the following. 1. We determine the rate achieved by changing the underlying distribution used in random coding. 2. We determine the rate of a list-decoding version of B[subscript h]-codes achieved by the random coding method. 3. We study several related problems about Rényi entropy.
by Yuzhou Gu.
M. Eng.
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Wang, Sy Bor 1976. "Communication error detection using facial expressions". Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/45881.
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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2008.Includes bibliographical references (p. 129-135).
Automatic detection of communication errors in conversational systems typically rely only on acoustic cues. However, perceptual studies have indicated that speakers do exhibit visual communication error cues passively during the system's conversational turn. In this thesis, we introduce novel algorithms for face and body gesture recognition and present the first automatic system for detecting communication errors using facial expressions during the system's turn. This is useful as it detects communication problems before the user speaks a reply. To detect communication problems accurately and efficiently we develop novel extensions to hidden-state discriminative methods. We also present results that show when human subjects become aware that the conversational system is capable of receiving visual input, they become more communicative visually yet naturally.
by Sy Bor Wang.
Ph.D.
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Lu, Yi. "Error correction codes for molecular communication systems". Thesis, University of Warwick, 2016. http://wrap.warwick.ac.uk/88085/.
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Molecular communications (MC) is a bio-inspired paradigm that aims to utilise molecules to exchange information among nano-machines. Given the tiny devices used in a MC system and the feasibility of MC in biological environments, MC can be applied to many applications ranging from the healthcare to manufacturing fields. In order to better realize these applications in the future, this Ph.D. research is dedicated to the investigation of a more functional, precise and reliable Diffusion-based Molecular Communications (DBMC) system. To achieve this goal, the contributions of this thesis are as follows. Firstly, the point-to-point (PTP) DBMC system with the absorbing receiver model is established and investigated. A study of the accuracy of the analytical channel model is also introduced. Secondly, dependent on different types of the transmitter (TX) and receiver (RX), three different communication scenarios are proposed. Thirdly, to enhance the reliability of the information at RX, the Error Correction Codes (ECCs), as the most prominent technique is employed within the DBMC system to control or correct any errors introduced during the transmission process. Fourthly, due to the limitation of the power budget of the nano-machines, the energy efficiency of the system is also taken into account. Finally, a two-receiver broadcast DBMC system is established with an absorbing interfering receiver (RI) and an absorbing target receiver (RT). By analysing the performance of the communication link between TX and RT (target communication link), the impact of the positions of RI on RT is studied. This study indicates that the application of ECCs does enhance the performance of PTP DBMC systems. In addition, the encoder and decoder design, and the BER performance are shown to be the two primary factors for selecting the most suitable ECC for the application. Finally, considering a two-receiver broadcast DBMC system with absorbing receivers, the existence of RI does affect the performance of the target communication link which is crucial result for the field moving forward.
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Ratzer, Edward Alexander. "Error-correction on non-standard communication channels". Thesis, University of Cambridge, 2004. https://www.repository.cam.ac.uk/handle/1810/237471.
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Many communication systems are poorly modelled by the standard channels assumed in the information theory literature, such as the binary symmetric channel or the additive white Gaussian noise channel. Real systems suffer from additional problems including time-varying noise, cross-talk, synchronization errors and latency constraints. In this thesis, low-density parity-check codes and codes related to them are applied to non-standard channels. First, we look at time-varying noise modelled by a Markov channel. A low-density parity-check code decoder is modified to give an improvement of over 1dB. Secondly, novel codes based on low-density parity-check codes are introduced which produce transmissions with Pr(bit = 1) ≠ Pr(bit = 0). These non-linear codes are shown to be good candidates for multi-user channels with crosstalk, such as optical channels. Thirdly, a channel with synchronization errors is modelled by random uncorrelated insertion or deletion events at unknown positions. Marker codes formed from low-density parity-check codewords with regular markers inserted within them are studied. It is shown that a marker code with iterative decoding has performance close to the bounds on the channel capacity, significantly outperforming other known codes. Finally, coding for a system with latency constraints is studied. For example, if a telemetry system involves a slow channel some error correction is often needed quickly whilst the code should be able to correct remaining errors later. A new code is formed from the intersection of a convolutional code with a high rate low-density parity-check code. The convolutional code has good early decoding performance and the high rate low-density parity-check code efficiently cleans up remaining errors after receiving the entire block. Simulations of the block code show a gain of 1.5dB over a standard NASA code.
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Almulhem, Abdulaziz S. "Error correction techniques for ATM communications". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0009/NQ36627.pdf.
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Chen, Meng. "Error resilience in heterogeneous visual communications". College Park, Md. : University of Maryland, 2007. http://hdl.handle.net/1903/7323.
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Thesis (Ph. D.) -- University of Maryland, College Park, 2007.Thesis research directed by: Electrical Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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Bai, Chenyao. "Error control in bacterial quorum communications". Thesis, University of Warwick, 2016. http://wrap.warwick.ac.uk/80028/.
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Quorum sensing (QS) is used to describe the communication between bacterial cells, whereby a coordinated population response is controlled through the synthesis, accumulation and subsequent sensing of specific diffusible chemical signals called autoinducers, enabling a cluster of bacteria to regulate gene expression and behavior collectively and synchronously, and assess their own population. As a promising method of molecular communication (MC), bacterial populations can be programmed as bio-transceivers to establish information transmission using molecules. In this work, to investigate the key features for MC, a bacterial QS system is introduced, which contains two clusters of bacteria, specifically Vibrio fischeri, as the transmitter node and receiver node, and the diffusive channel. The transmitted information is represented by the concentration of autoinducers with on-off keying (OOK) modulation. In addition, to achieve better reliability and energy efficiency, different error control techniques, including forward error correction (FEC) and Automatic Repeat reQuest (ARQ) are taken into consideration. For FEC, this work presents a comparison of the performance of traditional Hamming codes, Minimum Energy Codes (MEC) and Luby Transform (LT) codes over the channel. In addition, it applied several ARQ protocols, namely Stop-N-Wait (SW-ARQ), Go-Back-N (GBN-ARQ), and Selective-Repeat (SR-ARQ) combined with error detection codes to achieve better reliability. Results show that both the FEC and ARQ techniques can enhance the channel reliability, and that ARQ can resolve the issue of out-of-sequence and duplicate packet delivery. Moreover, this work further addresses the question of optimal frame size for data communication in this channel capacity and energy constrained bacterial quorum communication system. A novel energy model which is constructed using the experimental validated synthetic logic gates has been proposed to help with the optimization process. The optimal fixed frame length is determined for a set of channel parameters by maximizing the throughput and energy efficiency matrix.
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Sibayan, Anna Marie. "Prompted and Unprompted Self-Repairs of Filipino Students of Spanish as a Foreign Language". Doctoral thesis, Universitat de Barcelona, 2017. http://hdl.handle.net/10803/454821.
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The present dissertation, which contributes to the dearth of research on the acquisition of Spanish as a foreign language by Filipinos, is a pseudolongitudinal study of their Spanish interlanguage (IL) whose two-fold objective is to provide a descriptive analysis of their developing IL based on errors produced in their speech as influenced by language proficiency levels and crosslinguistic similarity of their other known languages, and to identify the thresholds of their IL based on the prompted and unprompted self-repair of these errors.
Participants of the study were four groups of students learning Spanish in a Philippine university who have had 432 hours, 1,008 hours, 1,872 hours, and 2,160 hours of formal instruction in Spanish, respectively. They were recorded in their own classroom contexts and individually in order to build two complementing oral corpora for the analysis of their speech. For the gathering of monologic data elicitation procedures from the research project El desarrollo del repertorio lingüístico en hablantes no nativos de castellano y catalán (Tolchinsky & Perera, 2006), which form part of the larger research project Developing Literacy in Different Contexts and Different Languages (Berman
& Verhoeven, 2002) was adopted. All 20 recorded classroom sessions and 40 monologic texts were transcribed according to the conventions of a transcription program. Errors were categorized according to their formal linguistic levels (Jarvis & Pavlenko, 2010), while prompted and unprompted self-repairs were identified as a result of classifying teacher feedback based on an adapted taxonomy of recasts and prompts (Lyster & Ranta, 1997). To respond to the objectives the following were analyzed: (a) the distribution of error types and subtypes in relation to the targetlanguage (TL) proficiency, (b) the frequency of attempts to self-repair these errors with and without the prompting of the teacher, (c) the rate of success of prompted and unprompted self-repairs in
relation to TL proficiency, and (d) the effect of crosslinguistic similarity of previously learned languages and their corresponding proficiency levels on error production.
Results showed that morphosyntactic errors were produced the most, followed by lexicalsemantic errors, and lastly, by phonetic-phonological errors, with each proficiency group producing such errors quite differently (e.g., omission of determiners is largely a characteristic of a beginner). Results likewise showed that while TL proficiency has a negative effect on the production of errors, it has no effect on the distribution of error types nor in the recognition of these errors. Teachers and students alike verbally recognized approximately 20% of the errors; teachers called out lexical-semantic errors the most, while students most independently recognized and successfully self-repair morphosyntactic errors. Of the recognized errors, about 60% of teacher-prompted errors and roughly 80% of independently recognized errors were successfully repaired. Albeit inconclusive, TL proficiency may have a positive effect on success in self-repair.
By contrast, SL proficiency was observed to have a positive effect on the production of transfer errors, however, in the case of the multilingual learner, transfer mostly comes from the more objectively similar language and not from the language that he perceives to be more similar to the TL. The implications of these findings for future research and language pedagogy are outlined in the final chapter, which concludes the present dissertation.Esta tesis, que contribuye a la carencia de estudios sobre la adquisición de los filipinos del español como lengua extranjera, tiene el doble objetivo de proporcionar un análisis descriptivo de su interlengua (IL) en desarrollo, partiendo de los errores encontrados en su producción oral influidos por el conocimiento de otros idiomas y el dominio de éstos; y de identificar los límites de su IL partiendo de las autorreparaciones. Se recogieron y transcribieron los datos de interacción en el aula (20 horas) y datos monológicos producidos (40 textos) por cuatro grupos de alumnos de español de una universidad filipina, que habían pertenecientes a los niveles A1-, A1+, B1- y B1+. Para responder a los objetivos, se analizaron los siguientes aspectos: (a) la distribución de los tipos y tipos de errores en relación con el dominio de la lengua objeto (LO), (b) la frecuencia de las autorreparaciones con y sin la ayuda del profesor, (c) la tasa de éxito de las autorreparaciones en relación con el dominio de la LO, y (d) el efecto de la similitud de lenguas previamente aprendidas y del nivel de dominio de dichas lenguas en la producción de errores. Los resultados indican que los errores morfosintácticos son los que aparecen con mayor frecuencia, seguidos, en este orden, por los léxico-semánticos y los fonético-fonológicos. También se observa que si bien el dominio de la LO tiene un efecto negativo en la producción total de errores, no determina la distribución de los tipos de error ni el reconocimiento de estos errores por parte de los aprendices. Por otra parte, los alumnos se autorreparon con más éxito en el caso de aquellos errores que son capaces de identificar por sí mismos en contraste con lo que ocurre con los detectados con la ayuda del profesor. Por el contrario, el dominio de otras lenguas y/o su cercanía tipológica con la LO tienen un efecto positivo en la producción de errores de transferencia. Es decir, cuánto más dominio y más similitud tiene, mayor es su influencia en la producción de errores. Se concluye el trabajo con una discusión de las implicaciones de estos hallazgos.
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Green, Robert James. "Advanced error management in high-speed communication networks". Thesis, University of Birmingham, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.368287.
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Rodrigues, Luís Filipe Abade. "Error correcting codes for visible light communication systems". Master's thesis, Universidade de Aveiro, 2015. http://hdl.handle.net/10773/15887.
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Mestrado em Engenharia Eletrónica e TelecomunicaçõesOver the past few years, the number of wireless networks users has been increasing. Until now, Radio-Frequency (RF) used to be the dominant technology. However, the electromagnetic spectrum in these region is being saturated, demanding for alternative wireless technologies. Recently, with the growing market of LED lighting, the Visible Light Communications has been drawing attentions from the research community. First, it is an eficient device for illumination. Second, because of its easy modulation and high bandwidth. Finally, it can combine illumination and communication in the same device, in other words, it allows to implement highly eficient wireless communication systems. One of the most important aspects in a communication system is its reliability when working in noisy channels. In these scenarios, the received data can be afected by errors. In order to proper system working, it is usually employed a Channel Encoder in the system. Its function is to code the data to be transmitted in order to increase system performance. It commonly uses ECC, which appends redundant information to the original data. At the receiver side, the redundant information is used to recover the erroneous data. This dissertation presents the implementation steps of a Channel Encoder for VLC. It was consider several techniques such as Reed-Solomon and Convolutional codes, Block and Convolutional Interleaving, CRC and Puncturing. A detailed analysis of each technique characteristics was made in order to choose the most appropriate ones. Simulink models were created in order to simulate how diferent codes behave in diferent scenarios. Later, the models were implemented in a FPGA and simulations were performed. Hardware co-simulations were also implemented to faster simulation results. At the end, diferent techniques were combined to create a complete Channel Encoder capable of detect and correct random and burst errors, due to the usage of a RS(255,213) code with a Block Interleaver. Furthermore, after the decoding process, the proposed system can identify uncorrectable errors in the decoded data due to the CRC-32 algorithm.
Ao longo dos últimos anos o número de utilizadores de redes sem fios tem aumentado. Até ao momento, a tecnologia RF (Radio Frequência) dominado este segmento. No entanto, a saturação nessa região do espectro eletromagnético exige tecnologias alternativas para redes sem fios. Recentemente, com o crescimento do mercado da iluminação LED (Díodo Emissor de Luz), as Comunicações por Luz Visível têm atraído as atenções dos investigadores. Em primeiro lugar, é uma fonte de luz eficiente para aplicações de iluminação. Em segundo lugar, o LED é um dispositivo que é facilmente modulado e com grande largura de banda. Por último, permite combinar iluminação e comunicação no mesmo dispositivo, ou seja, permite a implementação de sistemas de comunicação sem fios altamente eficientes. Um dos aspetos mais importantes num sistema de comunicação é a sua fiabilidade quando sujeitos a canais com ruído. Nestes cenários, a informação recebida pode vir afetada de erros. Para garantir o correto funcionamento do sistema, é muito comum o uso de um codificador de canal. A sua função é codificar a informação a ser enviada para melhorar a performance do sistema. O uso de Códigos de Correção de Erros é muito frequente permitindo anexar informação redundante aos dados originais. No recetor, a informação redundante é usada para recuperar possíveis erros na transmissão. Esta dissertação apresenta os passos da implementação de um Codificador de Canal para VLC. Foram consideradas várias técnicas tais como os códigos Reed-Solomon e os códigos Convolucionais, Interleaving (Bloco e Convolucional), CRC e Puncturing. Foi efetuada uma análise das características de cada técnica a fim de avaliar quais as mais apropriadas para o cenário em questão. Numa primeira fase, vários modelos foram implementados em Simulink a fim de simular o comportamento dos mesmos em diferentes cenários. Mais tarde os modelos foram implementados e simulados em blocos de hardware. Para obter resultados de uma forma mais rápida, foram elaborados modelos de co-simulação em hardware. No final, diferentes técnicas foram combinadas para criar um Codificador de Canal capaz de detetar e corrigir erros aleatórios e em rajada, graças ao uso de códigos Reed-Solomon em conjunto com técnicas de Interleaving. Adicionalmente, usando o algoritmo CRC, após o processo de descodficação, o sistema proposto é capaz de identificar possíveis erros que não puderam ser corrigidos.
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Cao, Lei. "Error resilient image coding and wireless communications /". free to MU campus, to others for purchase, 2002. http://wwwlib.umi.com/cr/mo/fullcit?p3052160.
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McPhail, Bernard N. B. (Bernard Nicolas Bruce) Carleton University Dissertation Engineering Electrical. "Error control coding for land mobile communications". Ottawa, 1986.
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Chen, Wu-hsiang Jonas. "Error-resilient techniques for packet video communications /". Thesis, Connect to this title online; UW restricted, 1999. http://hdl.handle.net/1773/5850.
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Murphy, Philippa. "Analyses of communication failures in rail engineering works". Thesis, University of Nottingham, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.275298.
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Ganguly, Amlan. "Transient error resilience in network-on-chip communication fabrics". Online access for everyone, 2007. http://www.dissertations.wsu.edu/Thesis/Spring2007/A_Ganguly_043007.pdf.
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Jibril, Mubarak. "Algebraic codes for error correction in digital communication systems". Thesis, University of Plymouth, 2011. http://hdl.handle.net/10026.1/1188.
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C. Shannon presented theoretical conditions under which communication was possible error-free in the presence of noise. Subsequently the notion of using error correcting codes to mitigate the effects of noise in digital transmission was introduced by R. Hamming. Algebraic codes, codes described using powerful tools from algebra took to the fore early on in the search for good error correcting codes. Many classes of algebraic codes now exist and are known to have the best properties of any known classes of codes. An error correcting code can be described by three of its most important properties length, dimension and minimum distance. Given codes with the same length and dimension, one with the largest minimum distance will provide better error correction. As a result the research focuses on finding improved codes with better minimum distances than any known codes. Algebraic geometry codes are obtained from curves. They are a culmination of years of research into algebraic codes and generalise most known algebraic codes. Additionally they have exceptional distance properties as their lengths become arbitrarily large. Algebraic geometry codes are studied in great detail with special attention given to their construction and decoding. The practical performance of these codes is evaluated and compared with previously known codes in different communication channels. Furthermore many new codes that have better minimum distance to the best known codes with the same length and dimension are presented from a generalised construction of algebraic geometry codes. Goppa codes are also an important class of algebraic codes. A construction of binary extended Goppa codes is generalised to codes with nonbinary alphabets and as a result many new codes are found. This construction is shown as an efficient way to extend another well known class of algebraic codes, BCH codes. A generic method of shortening codes whilst increasing the minimum distance is generalised. An analysis of this method reveals a close relationship with methods of extending codes. Some new codes from Goppa codes are found by exploiting this relationship. Finally an extension method for BCH codes is presented and this method is shown be as good as a well known method of extension in certain cases.
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Fan, Xiaopeng. "Wyner-ziv coding and error control for video communication /". View abstract or full-text, 2009. http://library.ust.hk/cgi/db/thesis.pl?ECED%202009%20FAN.
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Moretti, Marc-Jules Bernard 1964. "Bit error rate computation in optical fiber communications". Thesis, The University of Arizona, 1991. http://hdl.handle.net/10150/278009.
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The focus of this thesis is the computation of bit error rate in an optical fiber communication system when an avalanche photodiode (APD) is used for detection. The use of the APD increases the complexity of the BER calculation because it introduces an additional noise phenomenon: shot noise (plus multiplication noise). There are several methods to compute the BER. This thesis considers three of these methods: the Gaussian approximation, the saddlepoint approximation and a numerical quadrature method. An in-depth analysis of each computation method is presented after a thorough study of APD characteristics, involving its probability density function and its moment generating function. Numerical examples are shown and compared for each method. The examples show that the saddlepoint approximation method can be used to provide an accurate, simple form for the bit error rate, and that the Gaussian approximation tends to underestimate the BER at high gains. Different results with different photodetectors are illustrated throughout the thesis for a better understanding.
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Apollonio, Pietrofrancesco. "Erasure error correcting codes applied to DTN communications". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amslaurea.unibo.it/6852/.
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The space environment has always been one of the most challenging for
communications, both at physical and network layer. Concerning the latter,
the most common challenges are the lack of continuous network connectivity,
very long delays and relatively frequent losses. Because of these problems,
the normal TCP/IP suite protocols are hardly applicable. Moreover, in
space scenarios reliability is fundamental. In fact, it is usually not tolerable
to lose important information or to receive it with a very large delay because
of a challenging transmission channel. In terrestrial protocols, such as TCP,
reliability is obtained by means of an ARQ (Automatic Retransmission reQuest)
method, which, however, has not good performance when there are long
delays on the transmission channel. At physical layer, Forward Error Correction Codes (FECs), based on the insertion of redundant information, are an alternative way to assure reliability.
On binary channels, when single bits are flipped because of channel noise,
redundancy bits can be exploited to recover the original information. In the
presence of binary erasure channels, where bits are not flipped but lost, redundancy can still be used to recover the original information. FECs codes,
designed for this purpose, are usually called Erasure Codes (ECs). It is worth
noting that ECs, primarily studied for binary channels, can also be used at
upper layers, i.e. applied on packets instead of bits, offering a very interesting alternative to the usual ARQ methods, especially in the presence of long
delays. A protocol created to add reliability to DTN networks is the Licklider Transmission Protocol
(LTP), created to obtain better performance on long delay links. The aim of this thesis is the application of ECs to LTP.
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Hassanien, Mohamed A. M. "Error rate performance metrics for digital communications systems". Thesis, Swansea University, 2011. https://cronfa.swan.ac.uk/Record/cronfa42497.
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In this thesis, novel error rate performance metrics and transmission solutions are investigated for delay limited communication systems and for co-channel interference scenarios. The following four research problems in particular were considered. The first research problem is devoted to analysis of the higher order ergodic moments of error rates for digital communication systems with time- unlimited ergodic transmissions and the statistics of the conditional error rates of digital modulations over fading channels are considered. The probability density function and the higher order moments of the conditional error rates are obtained. Non-monotonic behavior of the moments of the conditional bit error rates versus some channel model parameters is observed for a Ricean distributed channel fading amplitude at the detector input. Properties and possible applications of the second central moments are proposed. The second research problem is the non-ergodic error rate analysis and signaling design for communication systems processing a single finite length received sequence. A framework to analyze the error rate properties of non-ergodic transmissions is established. The Bayesian credible intervals are used to estimate the instantaneous bit error rate. A novel degree of ergodicity measure is introduced using the credible interval estimates to quantify the level of ergodicity of the received sequence with respect to the instantaneous bit error rate and to describe the transition of the data detector from the non-ergodic to ergodic zone of operation. The developed non-ergodic analysis is used to define adaptive forward error correction control and adaptive power control policies that can guarantee, with a given probability, the worst case instantaneous bit error rate performance of the detector in its transition fi'om the non-ergodic to ergodic zone of operation. In the third research problem, novel retransmission schemes are developed for delay-limited retransmissions. The proposed scheme relies on a reliable reverse link for the error-free feedback message delivery. Unlike the conventional automatic repeat request schemes, the proposed scheme does not require the use of cyclic redundancy check bits for error detection. In the proposed scheme, random permutations are exploited to locate the bits for retransmission in the predefined window within the packet. The retransmitted bits are combined using the maximal-ratio combining. The complexity-performance trade-offs of the proposed scheme is investigated by mathematical analysis as well as computer simulations. The bit error rate of the proposed scheme is independent of the packet length while the throughput is dependent on the packet length. Three practical techniques suitable for implementation are proposed. The performance of the proposed retransmission scheme was compared to the block repetition code corresponding to a conventional ARQ retransmission strategy. It was shown that, for the same number of retransmissions, and the same packet length, the proposed scheme always outperforms such repetition coding, and, in some scenarios, the performance improvement is found to be significant. Most of our analysis has been done for the case of AWGN channel, however, the case of a slow Rayleigh block fading channel was also investigated. The proposed scheme appears to provide the throughput and the BER reduction gains only for the medium to large SNR values. Finally, the last research problem investigates the link error rate performance with a single co-channel interference. A novel metric to assess whether the standard Gaussian approximation of a single interferer underestimates or overestimates the link bit error rate is derived. This metric is a function of the interference channel fading statistics. However, it is otherwise independent of the statistics of the desired signal. The key step in derivation of the proposed metric is to construct the standard Gaussian approximation of the interference by a non-linear transformation. A closed form expression of the metric is obtained for a Nakagami distributed interference fading amplitude. Numerical results for the case of Nakagami and lognormal distributed interference fading amplitude confirm the validity of the proposed metric. The higher moments, interval estimators and non-linear transformations were investigated to evaluate the error rate performance for different wireless communication scenarios. The synchronization channel is also used jointly with the communication link to form a transmission diversity and subsequently, to improve the error rate performance.
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Karmarkar, Kedar Madhav. "SCALABLE BUS ENCODING FOR ERROR-RESILIENT HIGH-SPEED ON-CHIP COMMUNICATION". OpenSIUC, 2013. https://opensiuc.lib.siu.edu/dissertations/720.
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Shrinking minimum feature size in deep sub-micron has made fabrication of progressively faster devices possible. The performance of interconnects has been a bottleneck in determining the overall performance of a chip. A reliable high-speed communication technique is necessary to improve the performance of on-chip communication. Recent publications have demonstrated that use of multiple threshold voltages improves the performance of a bus significantly. The multi-threshold capture mechanism takes advantage of predictable temporal behavior of a tightly coupled bus to predict the next state of the bus early. However, Use of multiple threshold voltages also reduces the voltage slack and consequently increases the susceptibility to noise. Reduction in supply voltage exacerbates the situation. This work proposes a novel error detection and correction encoding technique that takes advantage of the high performance of the multi-threshold capture mechanism as well as its inbuilt redundancy to achieve reliable high-speed communication while introducing considerably less amount of redundancy as compared to the conventional methods. The proposed technique utilizes graph-based algorithms to produce a set of valid code words. The algorithm takes advantage of implicit set operations using binary decision diagram to improve the scalability of the code word selection process. The code words of many crosstalk avoidance codes including the proposed error detection and correction technique exhibit a highly structured behavior. The sets of larger valid code words can be recursively formed using the sets of smaller valid code words. This work also presents a generalized framework for scalable on-chip code word generation. The proposed CODEC implementation strategy uses a structured graph to model the recursive nature of an encoding technique that facilitates scalable CODEC implementation. The non-enumerative nature of the implementation strategy makes it highly scalable. The modular nature of the CODEC also simplifies use of pipelined architecture thereby improving the throughput of the bus.
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Abdelhamid, Awad Aly Ahmed Sala. "Quantum error control codes". Diss., Texas A&M University, 2008. http://hdl.handle.net/1969.1/85910.
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It is conjectured that quantum computers are able to solve certain problems more
quickly than any deterministic or probabilistic computer. For instance, Shor's algorithm
is able to factor large integers in polynomial time on a quantum computer.
A quantum computer exploits the rules of quantum mechanics to speed up computations.
However, it is a formidable task to build a quantum computer, since the
quantum mechanical systems storing the information unavoidably interact with their
environment. Therefore, one has to mitigate the resulting noise and decoherence
effects to avoid computational errors.
In this dissertation, I study various aspects of quantum error control codes - the key component of fault-tolerant quantum information processing. I present the
fundamental theory and necessary background of quantum codes and construct many
families of quantum block and convolutional codes over finite fields, in addition to
families of subsystem codes. This dissertation is organized into three parts:
Quantum Block Codes. After introducing the theory of quantum block codes, I
establish conditions when BCH codes are self-orthogonal (or dual-containing)
with respect to Euclidean and Hermitian inner products. In particular, I derive
two families of nonbinary quantum BCH codes using the stabilizer formalism. I study duadic codes and establish the existence of families of degenerate quantum
codes, as well as families of quantum codes derived from projective geometries.
Subsystem Codes. Subsystem codes form a new class of quantum codes in which
the underlying classical codes do not need to be self-orthogonal. I give an
introduction to subsystem codes and present several methods for subsystem
code constructions. I derive families of subsystem codes from classical BCH and
RS codes and establish a family of optimal MDS subsystem codes. I establish
propagation rules of subsystem codes and construct tables of upper and lower
bounds on subsystem code parameters.
Quantum Convolutional Codes. Quantum convolutional codes are particularly
well-suited for communication applications. I develop the theory of quantum
convolutional codes and give families of quantum convolutional codes based
on RS codes. Furthermore, I establish a bound on the code parameters of
quantum convolutional codes - the generalized Singleton bound. I develop a
general framework for deriving convolutional codes from block codes and use it
to derive families of non-catastrophic quantum convolutional codes from BCH
codes.
The dissertation concludes with a discussion of some open problems.