Objetivos: avaliar a prevalência de alterações auditivas em recém-nascidos de muito baixo peso na Unidade de Tratamento Intensivo Neonatal do Hospital de Clínicas de Porto Alegre e estudar as variáveis que possam estar relacionadas com as alterações da acui-dade auditiva. Métodos: foi realizado um estudo transversal que incluiu todos os recém-nascidos de muito baixo peso admitidos na Unidade de Tratamento Intensivo Neonatal do Hospital de Clínicas de Porto Alegre no período de 1o de setembro de 2001 a 31 de janeiro de 2002. To-dos os pacientes foram submetidos ao exame de otoemissão acústica evocada por produto de distorção no momento da alta hospitalar. O exame foi repetido em 30 dias quando havia alte-ração no primeiro exame. Quando o paciente apresentava o exame de otoemissão acústica al-terada em duas ocasiões, era realizado o potencial auditivo evocado cerebral, considerado al-terado a partir de 35 dB NA. Resultados: foram estudados 96 recém-nascidos. Seis tiveram tanto o exame de otoemissão acústica quanto o potencial auditivo evocado cerebral alterados. A média da idade gestacional foi de 31,5 ± 2,6 semanas, o peso de nascimento variou de 640 a 1.500 g e 57,3% dos pacientes eram do sexo feminino. A idade gestacional e o índice de Apgar no 5o minuto foram inferiores no grupo otoemissão acústica e potencial auditivo evocado cerebral alterados em relação aos demais grupos, atingindo significância limítrofe. Conclusões: a prevalência de perda auditiva nos recém-nascidos de muito baixo peso da Unidade de Tratamento Intensivo Neonatal do Hospital de Clínicas de Porto Alegre foi de 6,3%, tendo sido observadas associações de significância limítrofe com idade gestacional e índice de Apgar no 5o minuto. / Objectives: to evaluate the prevalence of hearing loss in very low birth weight patients in the Neonatal Intensive Care Unit of the Hospital de Clínicas de Porto Alegre and to study the variables that can be related to hearing loss. Methods: a transversal study was carried through including all very low birth weight neonates admitted in the Neonatal Intensive Care Unit of the Hospital de Clínicas de Porto Alegre during September 1, 2000 to January 31, 2002. All patients were undergone to the distortion evoked otoacoustic emission test in the hospital discharge. When the patient presented alteration in this test, it was repeated in 30 days. However, when the patient who presented pathologic otoacoustic emission on two ocasions was undergone to the auditory evoked brain response. This test was considered abnormal from 35 dB NA. Results: we studied 96 neonates. Six children presented alteration in the distortion evoked otoacoustic emission test as well in the auditory evoked brain response. The children age average was 31.5 ± 2.6 weeks, their birth weight was between 640 g and 1,500 g, and 57.3% of the patients were female. The gestational age and the Apgar score at 5 minutes were inferior in the otoacoustic emission and auditory evoked brain response abnormal group related to the other groups, reaching bordering significance. Conclusions: the hearing loss prevalence of the very low birth weight neonates from the Neonatal Intensive Care Unit of the HCPA was 6.3%, and it was observed bordering significance associations related to gestational age and 5 minutes Apgar score.

Submitted by Beatriz Lopez Nunez (beatriz.lopez.nunez@hotmail.com) on 2016-11-01T16:25:24Z No. of bitstreams: 1 Correct_FGV_Beatriz_LopezNunez_Final.pdf: 1662185 bytes, checksum: 503c9199ac7bb99534f37f9232fc2b7c (MD5) / Approved for entry into archive by Fabiana da Silva Segura (fabiana.segura@fgv.br) on 2016-11-01T16:41:46Z (GMT) No. of bitstreams: 1 Correct_FGV_Beatriz_LopezNunez_Final.pdf: 1662185 bytes, checksum: 503c9199ac7bb99534f37f9232fc2b7c (MD5) / Made available in DSpace on 2016-11-01T17:11:05Z (GMT). No. of bitstreams: 1 Correct_FGV_Beatriz_LopezNunez_Final.pdf: 1662185 bytes, checksum: 503c9199ac7bb99534f37f9232fc2b7c (MD5) Previous issue date: 2016 / Previous studies have proven that graphs are often manipulated to feign a better and sometimes unreal image of the company to investors and other users of annual reports, who rely on graphical disclosure in their decision-making process. This paper uses hand collected data from the reports of a representative sample of 57 Brazilian companies that belong to the Bovespa Index in 2014, and presents an empirical analysis of the use and misuse of graphs in their annual reports. Results not only reveal that the usage of graphs in annual reports is very important to Brazilian companies, but also that there is evidence of measurement distortion (favorable deviations for the companies) and presentational enhancement. In addition, the study shows that the lower the corporate’s performance and governance, the higher the probability of measurement distortion. Although there is no evidence of selectivity, the study proves that companies with worse corporate governance are more likely to present this type of distortion. This paper expects to address this issue to preparers and users of annual reports in the country, and to draw attention of accounting regulatory institutions to formulate standard guidelines of graphical disclosure to avoid misleading information through graphs. / Estudos anteriores já provaram que os gráficos são frequentemente manipulados para aparentar uma imagem melhor – e muitas vezes irreal – da empresa para investidores e outros usuários dos relatórios anuais, que dependem da divulgação gráfica em seu processo de decisão. Esta investigação se baseia em dados coligidos a mão dos relatórios de uma amostra de 57 empresas pertencentes ao Índice Bovespa em 2014, e apresenta uma análise empírica do uso e abuso dos gráficos em seus relatórios anuais. Os resultados deste estudo não só revelam que o uso de gráficos em relatórios é de extrema importância para as empresas Brasileiras, mas também evidencia nos gráficos distorção de medida (divergências a favor das empresas) e a violação de princípios em sua construção. Além disso, o estudo demonstra que quanto pior o desempenho e a governança corporativa da empresa, maior a probabilidade de distorção de medida nos gráficos. Apesar de não haver evidência de seletividade, o trabalho prova que é mais provável que exista este tipo de distorção nos gráficos dos relatórios das empresas com pior governança corporativa. Este estudo pretende abordar esta questão aos preparadores e usuários brasileiros de relatórios anuais e chamar atenção das instituições reguladores contábeis para que formulem diretrizes padrões para a divulgação gráfica com o objetivo de evitar informação enganosa através de gráficos.

Literary representation of character in South Africa is not just problematic but also complicated by racial dynamics, which easily lead to prejudiced portrayal by most writers. Mphahlele's reaction to White writing's "distortion" of the image of Blacks, in his critical texts resulted in his being labelled a protest writer. Concerning his creative writing, he admits that he initially couldn't portray the character of a white person roundedly due to limited acquaintance with him. What he only knows about him and therefore depicts in his early writings is the White stereotype. His acquaintance with the White world through varied interaction gives a leverage that improves his portrayal of the White character. Consequently his later works reflect objective representation of characters from different races. The study therefore concludes that he falls outside the bracket of protest writers, as his literary works prove to transcend the limitations of stereotypical character representation. / Afrikaans and Theory of Literature / M.A. (Theory of Literature)

La technologie Ultra WideBand (UWB) sur fibre est une solution prometteuse pour répondre aux enjeux des futurs réseaux de communication WLAN/WPAN. Les caractéristiques de la fibre, incluant son énorme bande passante, offrent la possibilité d'une bonne qualité de service à longue portée. La propagation sans-fil UWB doit être réalisée sous des contraintes de densité spectrale de puissance particulières, imposées par l'autorité de régulation (FCC pour les Etats-Unis). La nouveauté de notre travail provient de I' exploitation des avantages d'un amplificateur optique à semi-conducteurs (SOA) afin d'obtenir une extension de portée à un coût et une complexité limités. Cependant, les effets non linéaires et le bruit d'émission spontanée amplifiée (ASE), intrinsèques à ce type de composant, sont susceptibles de dégrader la performance du système. La réduction de ces effets indésirables a donc été d'une importance centrale dans cette étude. Les non-linéarités du SOA ont été compensées en appliquant une solution de pré-distorsion analogique des formes d'ondes électriques. Un traitement basé sur phaser a également été proposé pour réduire simultanément I' influence de I'ASE et linéariser les caractéristiques du SOA, grâce à des opérations de chirping réparties entre l'émetteur et le récepteur. Avec la transmission Impulse Radio, en raison des propriétés temporelles des formats de modulation, des raies spectrales apparaissent, ce qui peut violer la limite FCC ou réduire I' efficacité énergétique. Une nouvelle technique de randomisation de formes d'ondes a été étudiée, qui s'est révélée efficace pour supprimer ces pics spectraux. Les trois approches ont montré un grand potentiel avec les formats On Off Keying et Pulse Position Modulation, à longue portée optique. Les performances d'une modulation différentielle Chaos Shift Keying ont finalement été examinées; une probabilité d'erreur inférieure a été obtenue expérimentalement en comparaison avec d'autres modulations non cohérentes. / Ultra WideBand (UWB) over fiber is a promising technology for meeting the demands of future wireless local-area networks (WLANs) and wireless personal-area networks (WPANs). Thanks to the enormous bandwidth and fiber characteristics, a high communication quality may be established at long reach. UWB wireless propagation must be achieved with special power and spectral constraints fixed by the regulatory bodies (e.g. US Federal Communication Commission). The novelty of our work originates from exploiting the benefits of a Semiconductor Optical Amplifier (SOA) so as to get a reach extension at limited cost and complexity. However, the inherent nonlinear effects and Amplified Spontaneous Emission (ASE) noise associated to such device may affect the system performance.Overcoming these impairments has been of central importance in this study. SOA nonlinearities have been mitigated by applying analog pre-distortion in electrical domain. Phaser-based processing was also proposed to simultaneously reduce ASE influence and linearize SOA characteristics, thanks to up/down chirping performed on the transmitter/receiver sides. With Impulse Radio UWB transmission, due to the time properties of modulation patterns, discrete lines arise in the corresponding spectrum, which may violate FCC limit or reduce the power efficiency. A new shape randomization technique has been investigated, which proved to be effective in suppressing these spectral spikes. The three approaches have shown a great potential with On Off Keying and Pulse Position Modulation formats at long optical reach.The performance of Differential Chaos Shift Keying was finally examined in the over fiber system, a lower error probability was experimentally achieved in comparison with other non-coherent modulations.

Objetivos: avaliar a prevalência de alterações auditivas em recém-nascidos de muito baixo peso na Unidade de Tratamento Intensivo Neonatal do Hospital de Clínicas de Porto Alegre e estudar as variáveis que possam estar relacionadas com as alterações da acui-dade auditiva. Métodos: foi realizado um estudo transversal que incluiu todos os recém-nascidos de muito baixo peso admitidos na Unidade de Tratamento Intensivo Neonatal do Hospital de Clínicas de Porto Alegre no período de 1o de setembro de 2001 a 31 de janeiro de 2002. To-dos os pacientes foram submetidos ao exame de otoemissão acústica evocada por produto de distorção no momento da alta hospitalar. O exame foi repetido em 30 dias quando havia alte-ração no primeiro exame. Quando o paciente apresentava o exame de otoemissão acústica al-terada em duas ocasiões, era realizado o potencial auditivo evocado cerebral, considerado al-terado a partir de 35 dB NA. Resultados: foram estudados 96 recém-nascidos. Seis tiveram tanto o exame de otoemissão acústica quanto o potencial auditivo evocado cerebral alterados. A média da idade gestacional foi de 31,5 ± 2,6 semanas, o peso de nascimento variou de 640 a 1.500 g e 57,3% dos pacientes eram do sexo feminino. A idade gestacional e o índice de Apgar no 5o minuto foram inferiores no grupo otoemissão acústica e potencial auditivo evocado cerebral alterados em relação aos demais grupos, atingindo significância limítrofe. Conclusões: a prevalência de perda auditiva nos recém-nascidos de muito baixo peso da Unidade de Tratamento Intensivo Neonatal do Hospital de Clínicas de Porto Alegre foi de 6,3%, tendo sido observadas associações de significância limítrofe com idade gestacional e índice de Apgar no 5o minuto. / Objectives: to evaluate the prevalence of hearing loss in very low birth weight patients in the Neonatal Intensive Care Unit of the Hospital de Clínicas de Porto Alegre and to study the variables that can be related to hearing loss. Methods: a transversal study was carried through including all very low birth weight neonates admitted in the Neonatal Intensive Care Unit of the Hospital de Clínicas de Porto Alegre during September 1, 2000 to January 31, 2002. All patients were undergone to the distortion evoked otoacoustic emission test in the hospital discharge. When the patient presented alteration in this test, it was repeated in 30 days. However, when the patient who presented pathologic otoacoustic emission on two ocasions was undergone to the auditory evoked brain response. This test was considered abnormal from 35 dB NA. Results: we studied 96 neonates. Six children presented alteration in the distortion evoked otoacoustic emission test as well in the auditory evoked brain response. The children age average was 31.5 ± 2.6 weeks, their birth weight was between 640 g and 1,500 g, and 57.3% of the patients were female. The gestational age and the Apgar score at 5 minutes were inferior in the otoacoustic emission and auditory evoked brain response abnormal group related to the other groups, reaching bordering significance. Conclusions: the hearing loss prevalence of the very low birth weight neonates from the Neonatal Intensive Care Unit of the HCPA was 6.3%, and it was observed bordering significance associations related to gestational age and 5 minutes Apgar score.

Submitted by DOUGLAS CARVALHO MORAIS (morais.sccp.carvalho@gmail.com) on 2018-04-26T20:36:20Z No. of bitstreams: 1 RETIFICADOR TRIFÁSICO BOOST SEM PONTE DE DIODOS, COM ELEVADO FATOR DE POTÊNCIA E CONTROLE POR RAZÃO CÍCLICA VARIÁVEL.pdf: 3578931 bytes, checksum: 59462e5e8af8153b4c38efb1636c59de (MD5) / Approved for entry into archive by Cristina Alexandra de Godoy null (cristina@adm.feis.unesp.br) on 2018-04-27T12:43:58Z (GMT) No. of bitstreams: 1 morais_dc_me_ilha.pdf: 3578931 bytes, checksum: 59462e5e8af8153b4c38efb1636c59de (MD5) / Made available in DSpace on 2018-04-27T12:43:58Z (GMT). No. of bitstreams: 1 morais_dc_me_ilha.pdf: 3578931 bytes, checksum: 59462e5e8af8153b4c38efb1636c59de (MD5) Previous issue date: 2018-03-02 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / Este trabalho tem como objetivo a proposição de um retificador trifásico boost semi-controlado, com correção ativa do fator de potência, que faça uso de técnicas de controle de razão cíclica variável, visando reduzir o conteúdo harmônico de corrente em baixa frequência. O conversor proposto opera em modo de condução descontínua, desta forma, a corrente de entrada segue uma envoltória senoidal. Além disso, devido ao modo de condução, o conversor apresenta a entrada em condução da chave com corrente nula, diminuindo assim, as perdas por chaveamento. Inicialmente, são apresentados, estudos teóricos da topologia em questão e, por meio de gráficos e equações, verifica-se a distorção harmônica imposta devida à operação com razão cíclica constante. Funções que permitam a variação permanente da razão cíclica, durante um ciclo da rede, serão apresentadas. Tais funções possuem o intuito de minimizar a distorção harmônica da corrente de entrada, com foco principal na 5ª componente harmônica. Resultados de simulação demonstram eficácia das técnicas de controle por razão cíclica variável e apontam redução no conteúdo harmônico de corrente. Resultados experimentais demonstram conteúdo harmônico de corrente em torno de 18% para operação do conversor com razão cíclica constante. A utilização de razão cíclica variável proporciona uma redução no conteúdo harmônico de corrente para 13%, resultando em um aumento do fator de potência. / This work aims propose a three-phase rectifier boost half-controlled, with power factor correction, that makes use variable duty cycle control techniques, in order to reduce the harmonic content of current in low frequency. The proposed converter operates in a discontinuous current conduction mode, this way, the input current is naturally corrected. Moreover, due to the conduction mode, the converter presents entry in conduction of switch with null current, thus decreasing, the losses by switching. Initially, are presented theoretical studies of the topology in question and, through of graphs and equations, the harmonic distortion imposed by operation due constant duty cycle is verified. Functions that allow permanently the variation of duty cycle, during a network cycle, are presented. These functions have as main objective minimize the harmonic distortion in the input current, with focus in the 5th harmonic component. Simulation results demonstrate efficacy of techniques by variable duty cycle control and indicate a reducing of harmonic content of current. Experimental results demonstrate a reducing around 18% for operation with constant duty cycle. The use of variable duty cycle provides a reducing around 13%, resulting in an increase of the power factor.

Made available in DSpace on 2014-12-17T14:56:12Z (GMT). No. of bitstreams: 1 PedroIAN_DISSERT.pdf: 1986241 bytes, checksum: 386b7b9f50f9765c6f2575f4e58ea4e5 (MD5) Previous issue date: 2012-12-11 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico / Due to major progress of communication system in the last decades, need for more precise characterization of used components. The S-parameters modeling has been used to characterization, simulation and test of communication system. However, limitation of S-parameters to model nonlinear system has created new modeling systems that include the nonlinear characteristics. The polyharmonic distortion modeling is a characterizationg technique for nonlinear systems that has been growing up due to praticity and similarity with S-parameters. This work presents analysis the polyharmonic distortion modeling, the test bench development for simulation of planar structure and planar structure characterization with X-parameters / O grande desenvolvimento dos sistemas de comunica??o nas ?ltimas d?cadas trouxe a necessidade de uma caracteriza??o cada vez mais precisa dos componentes utilizados. A modelagem por meio de par?metros-S ? utilizada para caracteriza??o, simula??o e testes de sistemas de comunica??o desde meados dos anos 60. Contudo a limita??o dos par?metros-S para sistemas lineares fez crescer a necessidade por novos tipos de parametriza??es que incluam as caracter?sticas de sistemas n?o lineares. A modelagem por distor??o poli-harm?nica ? uma t?cnica de caracteriza??o aplicada a sistemas n?o lineares que vem ganhando espa?o na literatura por sua praticidade e semelhan?a conceitual com os par?metros-S. Este trabalho apresentar? uma an?lise da modelagem por distor??o harm?nica, o desenvolvimento de um banco de testes para simula??o de estruturas planares e a caracteriza??o destas estruturas por meio de par?metros-X. Com isso pretende-se analisar a utiliza??o, precis?o e efici?ncia da modelagem por distor??o poli-harm?nica para estruturas planares

Este trabalho apresenta a análise e o desenvolvimento experimental de uma estrutura topológica de retificador híbrido trifásico que oferece as características operacionais de imposição de correntes de linha de entrada senoidais, de alto fator de potência, de reduzida distorção harmônica total de corrente e de fornecimento de um barramento CC com tensão regulada utilizando a inovadora técnica de Compensação Série de Tensão no Barramento CC tanto para condições normais de suprimento da rede elétrica como para condições de afundamentos temporários de tensão equilibrados e desequilibrados na rede CA. Para corroborar com a teoria exposta e com as análises de simulação computacional, um protótipo de 5 kW foi construído e ensaios experimentais realizados em laboratório permitiram demonstrar que para condições normais de suprimento da rede CA a solução proposta assegura distorções harmônicas de corrente na ordem de 2% e um fator de potência por fase próximo do valor unitário (0,996), além de ser capaz de regular e manter a tensão no barramento CC constante mesmo durante o transitório provocado por um degrau de carga de alta potência. Durante a ocorrência de afundamentos de tensão, a estrutura é capaz de regular a tensão do barramento CC no valor de referência estabelecido, assegurando elevado fator de potência mesmo durantes estes distúrbios da rede CA de alimentação. Destaca-se que estas características operacionais, além de serem alcançadas com os conversores chaveados que compõem a estrutura processando apenas uma parcela da potência total de saída, tornando o conjunto mais eficiente e robusto, fazem da estrutura proposta uma excelente alternativa para aplicações com elevados níveis de potência envolvendo a alimentação de cargas CC sensíveis aos distúrbios provocados pela rede CA e para aplicações que compreendem a compensação de oscilações de tensão devido às intermitências dos sistemas de microgeração que compõem as redes de distribuição em corrente contínua das microrredes. / This work presents the analysis and the experimental development of a topological structure of three-phase hybrid rectifier, which provides operational characteristics for imposing sinusoidal input line currents, with high power factor, low current total harmonic distortion and providing a DC bus with regulated voltage using the innovative technique of Series Voltage Compensation in the DC Bus for both normal conditions of mains power supply and for temporary sags for balanced and unbalanced voltage ac power supply conditions. In order to corroborate the exposed theory and with computational simulation analysis, a 5 kW prototype was assembled and experimental tests were conducted in laboratory. The results demonstrated that under normal conditions of AC mains supply the proposed solution ensures harmonic distortions about 2 % for the input AC currents and a power factor per phase approximately unitary (0.996). Moreover, the prototype can regulate and maintain the DC bus voltage in a constant value even during the transient caused by a high-power load step. During the occurrence of voltage sags, the structure can regulate the DC bus voltage in the established reference value, ensuring high power factor even during AC mains power supply disturbances. One can emphasize that these operational characteristics, in addition of being achieved with the switched converters that comprise the structure processing only an amount of the total output power, was observed that the whole assembly is more efficient and robust. The proposed structure is an excellent alternative for supplying high power DC loads sensitive to disturbances caused by AC mains and for applications involving voltage oscillations compensation due to intermittences of microgeneration systems that are connected to DC distribution of microgrids. / Tese (Doutorado)

Abstract Wireless sensor networks (WSNs) consisting of battery-powered sensors are increasingly deployed for a myriad of Internet of Things applications, e.g., environmental, industrial, and healthcare monitoring. Since wireless access is typically the main contributor to battery usage, minimizing communications is crucial to prolong network lifetime and improve user experience. The objective of this thesis is to develop and analyze energy-efficient distributed compressed data acquisition techniques for WSNs. The thesis proposes four approaches to conserve sensors' energy by minimizing the amount of information each sensor has to transmit to meet given application requirements. The first part addresses a cross-layer design to minimize the sensors’ sum transmit power via joint optimization of resource allocation and multi-path routing. A distributed consensus optimization based algorithm is proposed to solve the problem. The algorithm is shown to have superior convergence compared to several baselines. The remaining parts deal with compressed sensing (CS) of sparse/compressible sources. The second part focuses on the distributed CS acquisition of spatially and temporally correlated sensor data streams. A CS algorithm based on sliding window and recursive decoding is developed. The method is shown to achieve higher reconstruction accuracy with fewer transmissions and less decoding delay and complexity compared to several baselines, and to progressively refine past estimates. The last two approaches incorporate the quantization of CS measurements and focus on lossy source coding. The third part addresses the distributed quantized CS (QCS) acquisition of correlated sparse sources. A distortion-rate optimized variable-rate QCS method is proposed. The method is shown to achieve higher distortion-rate performance than the baselines and to enable a trade-off between compression performance and encoding complexity via the pre-quantization of measurements. The fourth part investigates information-theoretic rate-distortion (RD) performance limits of single-sensor QCS. A lower bound to the best achievable compression — defined by the remote RD function (RDF) — is derived. A method to numerically approximate the remote RDF is proposed. The results compare practical QCS methods to the derived limits, and show a novel QCS method to approach the remote RDF. / Tiivistelmä Patterikäyttöisistä antureista koostuvat langattomat anturiverkot yleistyvät esineiden internetin myötä esim. ympäristö-, teollisuus-, ja terveydenhoitosovelluksissa. Koska langaton tiedonsiirto kuluttaa merkittävästi energiaa, kommunikoinnin minimointi on elintärkeää pidentämään verkon elinikää ja parantamaan käyttäjäkokemusta. Väitöskirjan tavoitteena on kehittää ja analysoida energiatehokkaita hajautettuja pakattuja datankeruumenetelmiä langattomiin anturiverkkoihin. Työssä ehdotetaan neljä lähestymistapaa, jotka säästävät anturien energiaa minimoimalla se tiedonsiirron määrä, mikä vaaditaan täyttämään sovelluksen asettamat kriteerit. Väitöskirjan ensimmäinen osa tarkastelee protokollakerrosten yhteissuunnittelua, jossa minimoidaan anturien yhteislähetysteho optimoimalla resurssiallokaatio ja monitiereititys. Ratkaisuksi ehdotetaan konsensukseen perustuva hajautettu algoritmi. Tulokset osoittavat algoritmin suppenemisominaisuuksien olevan verrokkejaan paremmat. Loppuosat keskittyvät harvojen lähteiden pakattuun havaintaan (compressed sensing, CS). Toinen osa keskittyy tila- ja aikatasossa korreloituneen anturidatan hajautettuun keräämiseen. Työssä kehitetään liukuvaan ikkunaan ja rekursiiviseen dekoodaukseen perustuva CS-algoritmi. Tulokset osoittavat menetelmän saavuttavan verrokkejaan korkeamman rekonstruktiotarkkuuden pienemmällä tiedonsiirrolla sekä dekoodausviiveellä ja -kompleksisuudella ja kykenevän asteittain parantamaan menneitä estimaatteja. Työn viimeiset osat sisällyttävät järjestelmämalliin CS-mittausten kvantisoinnin keskittyen häviölliseen lähdekoodaukseen. Kolmas osa käsittelee hajautettua korreloitujen harvojen signaalien kvantisoitua CS-havaintaa (quantized CS, QCS). Työssä ehdotetaan särön ja muuttuvan koodinopeuden välisen suhteen optimoiva QCS-menetelmä. Menetelmällä osoitetaan olevan verrokkejaan parempi pakkaustehokkuus sekä kyky painottaa suorituskyvyn ja enkooderin kompleksisuuden välillä mittausten esikvantisointia käyttäen. Neljäs osa tutkii informaatioteoreettisia, koodisuhde-särösuhteeseen perustuvia suorituskykyrajoja yhden anturin QCS-järjestelmässä. Parhaimmalle mahdolliselle pakkaustehokkuudelle johdetaan alaraja, sekä kehitetään menetelmä sen numeeriseen arviointiin. Tulokset vertaavat käytännön QCS-menetelmiä johdettuihin rajoihin, ja osoittavat ehdotetun QCS-menetelmän saavuttavan lähes optimaalinen suorituskyky.

The research of the researching problems was grounded in via questionnaire (totally 270 questionnaires, 30 on each type of the school) which was conducted at Special Secondary School, Secondary Medical School and Grammar School with students of 1., 2., 3. graded in České Budějovice. Hypothesis assumed a heightened risk of arising disorder of food intake, bigger bias in their bodies and a heightened anxiety at the same time at Grammar School students which was also confirmed by the research. The conclusion includes a recommendation of precaution for parents, pedagogues and educators. It could provide them with sufficient amount of information about possible risks and curative procedures. It would be possilbe to emerge arising disorder of food ingake to obviate at all, thanks to.