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Gustafsson, Alex, and Carl Stensson. "The Performance of Post-Quantum Key Encapsulation Mechanisms : A Study on Consumer, Cloud and Mainframe Hardware." Thesis, Blekinge Tekniska Högskola, Institutionen för datavetenskap, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-21849.
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Background. People use the Internet for communication, work, online banking and more. Public-key cryptography enables this use to be secure by providing confidentiality and trust online. Though these algorithms may be secure from attacks from classical computers, future quantum computers may break them using Shor’s algorithm. Post-quantum algorithms are therefore being developed to mitigate this issue. The National Institute of Standards and Technology (NIST) has started a standardization process for these algorithms. Objectives. In this work, we analyze what specialized features applicable for post-quantum algorithms are available in the mainframe architecture IBM Z. Furthermore, we study the performance of these algorithms on various hardware in order to understand what techniques may increase their performance. Methods. We apply a literature study to identify the performance characteristics of post-quantum algorithms as well as what features of IBM Z may accommodate and accelerate these. We further apply an experimental study to analyze the practical performance of the two prominent finalists NTRU and Classic McEliece on consumer, cloud and mainframe hardware. Results. IBM Z was found to be able to accelerate several key symmetric primitives such as SHA-3 and AES via the Central Processor Assist for Cryptographic Functions (CPACF). Though the available Hardware Security Modules (HSMs) did not support any of the studied algorithms, they were found to be able to accelerate them via a Field-Programmable Gate Array (FPGA). Based on our experimental study, we found that computers with support for the Advanced Vector Extensions (AVX) were able to significantly accelerate the execution of post-quantum algorithms. Lastly, we identified that vector extensions, Application-Specific Integrated Circuits (ASICs) and FPGAs are key techniques for accelerating these algorithms. Conclusions. When considering the readiness of hardware for the transition to post-quantum algorithms, we find that the proposed algorithms do not perform nearly as well as classical algorithms. Though the algorithms are likely to improve until the post-quantum transition occurs, improved hardware support via faster vector instructions, increased cache sizes and the addition of polynomial instructions may significantly help reduce the impact of the transition.Bakgrund. Människor använder internet för bland annat kommunikation, arbete och bankärenden. Asymmetrisk kryptering möjliggör att detta sker säkert genom att erbjuda sekretess och tillit online. Även om dessa algoritmer förväntas vara säkra från attacker med klassiska datorer, riskerar framtida kvantdatorer att knäcka dem med Shors algoritm. Därför utvecklas kvantsäkra krypton för att mitigera detta problem. National Institute of Standards and Technology (NIST) har påbörjat en standardiseringsprocess för dessa algoritmer. Syfte. I detta arbete analyserar vi vilka specialiserade funktioner för kvantsäkra algoritmer som finns i stordator-arkitekturen IBM Z. Vidare studerar vi prestandan av dessa algoritmer på olika hårdvara för att förstå vilka tekniker som kan öka deras prestanda. Metod. Vi utför en litteraturstudie för att identifiera vad som är karaktäristiskt för kvantsäkra algoritmers prestanda samt vilka funktioner i IBM Z som kan möta och accelerera dessa. Vidare applicerar vi en experimentell studie för att analysera den praktiska prestandan av de två framträdande finalisterna NTRU och Classic McEliece på konsument-, moln- och stordatormiljöer. Resultat. Vi fann att IBM Z kunde accelerera flera centrala symmetriska primitiver så som SHA-3 och AES via en hjälpprocessor för kryptografiska funktioner (CPACF). Även om befintliga hårdvarusäkerhetsmoduler inte stödde några av de undersökta algoritmerna, fann vi att de kan accelerera dem via en på-plats-programmerbar grind-matris (FPGA). Baserat på vår experimentella studie, fann vi att datorer med stöd för avancerade vektorfunktioner (AVX) möjlggjorde en signifikant acceleration av kvantsäkra algoritmer. Slutligen identifierade vi att vektorfunktioner, applikationsspecifika integrerade kretsar (ASICs) och FPGAs är centrala tekniker som kan nyttjas för att accelerera dessa algortmer. Slutsatser. Gällande beredskapen hos hårdvara för en övergång till kvantsäkra krypton, finner vi att de föreslagna algoritmerna inte presterar närmelsevis lika bra som klassiska algoritmer. Trots att det är sannolikt att de kvantsäkra kryptona fortsatt förbättras innan övergången sker, kan förbättrat hårdvarustöd för snabbare vektorfunktioner, ökade cachestorlekar och tillägget av polynomoperationer signifikant bidra till att minska påverkan av övergången till kvantsäkra krypton.
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Saengsawang, Oraphan, Andreas Schüring, Ton Dammers, David Newsome, Marc-Olivier Coppens, and Siegfried Fritzsche. "Diffusion of n-pentane in zeolite ZK5." Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-193574.
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Saengsawang, Oraphan, Andreas Schüring, Ton Dammers, David Newsome, Marc-Olivier Coppens, and Siegfried Fritzsche. "Diffusion of n-pentane in zeolite ZK5." Diffusion fundamentals 6 (2007) 31, S. 1-2, 2007. https://ul.qucosa.de/id/qucosa%3A14206.
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Saengsawang, Oraphan, Pieter C. M. M. Magusin, Tawun Remsungnen, Arthorn Loisruangsin, Siegfried Fritzsche, Andreas Schüring, and Supot Hannongbua. "Rotational motion of n-Pentane in H-ZK5." Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-195613.
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Saengsawang, Oraphan, Pieter C. M. M. Magusin, Tawun Remsungnen, Arthorn Loisruangsin, Siegfried Fritzsche, Andreas Schüring, and Supot Hannongbua. "Rotational motion of n-Pentane in H-ZK5." Diffusion fundamentals 2 (2005) 34, S. 1-2, 2005. https://ul.qucosa.de/id/qucosa%3A14364.
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Tavares, Filho Sérgio Rodrigues. "Simulação de estrutura e cálculo de propriedades de Zn5(OH)8Cl2.H2O e Zn5(OH)8(NO3)2.2H2O utilizando métodos ab initio." Universidade Federal de Juiz de Fora (UFJF), 2013. https://repositorio.ufjf.br/jspui/handle/ufjf/5515.
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FAPEMIG - Fundação de Amparo à Pesquisa do Estado de Minas Gerais
Muitos compostos lamelares, como os hidróxidos duplos lamelares e os hidroxissais lamelares, vem ganhando cada vez mais atenção devido às suas inúmeras aplicabilidades no ramo de catálise, troca iônica e precursores para óxidos. Os dois compostos estudados aqui possuem sítios octaédricos e tetraédricos de zinco, sendo classificados por Louër et al. como hidroxissais do tipo II. O hidroxicloreto de zinco (Zn5(OH)8Cl2.H2O) é romboédrico e possui ocorrência natural sendo designado como simonkolleite. Enquanto que o hidroxinitrato de zinco diidratado (Zn5(OH)8(NO3)2.2H2O) é monoclínico e não possui ocorrência natural. Seus nitratos não se encontram coordenados aos zincos tetraédricos, como é o caso do composto Zn5(OH)8Cl2.H2O. Ao invés disso, suas moléculas de água se encontram coordenadas nos tetraedros e, para balancear a carga positiva das lamelas, esses nitratos se encontram na região interlamelar. Esses dois hidroxissais e uma modificação do hidroxinitrato de zinco com moléculas de amônia coordenadas aos tetraedros (BENARD, 1995) foram estudados por simulação computacional. O pacote Quantum ESPRESSO, baseado na Teoria do Funcional da Densidade (DFT – Density Functional Theory) com funções de onda planas e condições periódicas de contorno foi utilizado para a condução dos cálculos. As moléculas de água foram retiradas das estruturas hidratadas otimizadas e essas foram reotimizadas. Todos os dados experimentais foram comparados com os dados retirados das estruturas simuladas e um bom acordo foi obtido. A estrutura simulada do composto desidratado de Zn5(OH)8(NO3)2.2H2O não correspondeu à estrutura obtida pelo processo de calcinação, como foi visto pela análise termodinâmica do processo de desidratação. Porém, pôde ser concluído que essa estrutura corresponde ao mínimo local, pela ausência de frequências imaginárias. Cálculos de pós-processamento puderam ser conduzidos para uma análise das interações existentes nos compostos e das espécies químicas presentes neles. Os cloretos e os nitratos de ambos os compostos se mostraram equivalentes quimicamente, como foi visto pelo cálculo de pDOS (projected Density of States). As hidroxilas das células unitárias puderam também ser classificadas em dois grupos a partir de suas semelhanças químicas. Pôde-se concluir também com esse trabalho que o modelo de diminuição da célula unitária (DEYSE, 2012) foi capaz de diminuir os custos computacionais e prever certas propriedades dos compostos estudados.
Many layered compounds, like the double hydroxides and the hydroxide salts, have been gaining attention lately due to their various applicabilities in catalysis, anionic exchange and oxide precursors. The studied compounds here have octahedral and tetrahedral sites, which have been classified as type-2 hydroxide salts by Louër et al. Zinc hydroxide chloride monohydrate (Zn5(OH)8Cl2.H2O) is rhombohedric and is found in the nature as a mineral so-called simonkolleite. Whereas zinc hydroxide nitrate dihydrate (Zn5(OH)8(NO3)2.2H2O) is monoclinic and does not have natural occurrence. Their nitrates are not coordinated to the tetrahedral zincs, whereas the chlorides of Zn5(OH)8Cl2.H2O are grafted to the tetrahedral zincs. Their water molecules are grafted to the tetrahedrons and, in order to balance the charges, the nitrates are located in the interlayer region. Those hydroxide salts and a modification of the zinc hydroxide nitrate with ammonia molecules grafted to the tetrahedros (BENARD, 1995) have been studied by computational simulation. The Quantum ESPRESSO package based in the Density Functional Theory (DFT) with waveplanes and periodic boundary conditions was used for the calculations. The water molecules were removed from the optimized hydrate structures and, later on, those were re-optmized. All the experimental data were compared with the ones obtained by simulated structures and a good agreement was shown. The simulated dehydrate structure of Zn5(OH)8(NO3)2.2H2O did not correspond to the structure obtained by calcination, as it was shown by the thermodynamical analysis of the calcination process. However, it was concluded that this structure corresponds to a local minimum due to the lack of imaginary frequencies. Post-processing calculations were conducted in order to analyze the compounds' interactions and the chemical species. The chlorides and nitrates of both compounds were chemically equivalents, as it was shown by the pDOS calculations (projected Density of States). The hydroxyls of the unit cells could be classified in two groups based on their chemical equivalence. It could also be concluded with this work that the unit cell reduction method (DEYSE, 2012) was able to reduce the computational costs and to predict certain properties of the studied compounds.
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Castles, Nicola Jane. "The transmission of classical and patristic texts in late Anglo-Saxon and early Norman England." Thesis, University of St Andrews, 1993. http://hdl.handle.net/10023/2785.
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This thesis consists of a general introduction to the historical and palaeographical background to the subject of the transmission of Classical and Patristic texts in late Anglo-Saxon and early Norman England, followed by five chapters each dealing with a classical or patristic author. Each chapter lists the information we have available on manuscripts containing the author's work, and conclusions are drawn as to the transmission of that work. In the case of five texts, Persius, Satirae; Augustine, Enchiridion; Gregory, Cura pastoralis and Moralia and Isidore, Synonymar portions of each MS are taken and compared in detail with each other and with the modern printed edition, and a stemma is constructed on the basis of evidence thus obtained. A conclusion draws together the information on the transmission of such manuscripts throughout the eighth to twelfth centuries. There are two appendices: the first contains brief notes on texts by Classical and Patristic authors of which there are not enough copies to form stemmata, while the second takes the form of a short analysis of the use of the letter k in the margins of some insular MSS studied. There are also indices nominum et manuscriptorum. The work is divided into two volumes after Chapter Three.
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Kartal, Melis. "Honest Equilibria in Reputation Games: The Role of Time Preferences." American Economic Association, 2018. http://epub.wu.ac.at/6067/4/online.pdf.
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New relationships are often plagued with uncertainty because one of the players has some private information about her "type". The reputation literature has shown that equilibria that reveal this private information typically involve breach of trust and conflict. But are these inevitable for equilibrium learning? I analyze self-enforcing relationships where one party is privately informed about her time preferences. I show that there always exist honest reputation equilibria, which fully reveal information and support cooperation without breach or conflict. I compare these to dishonest reputation equilibria from several perspectives. My results are applicable to a broad class of repeated games.
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QUEIROGA, Luciano Nóbrega. "AVALIAÇÃO DA CAPACIDADE PREDITIVA DO MODELO DE PREVISÃO DE INSOLVÊNCIA DE UMA INSTITUIÇÃO FINANCEIRA: O MODELO PEREIRA DA SILVA DE PREVISÃO DE INSOLVÊNCIA E O TERMÔMETRO DE KANITZ." Universidade Federal de Pernambuco, 2003. https://repositorio.ufpe.br/handle/123456789/5800.
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Previous issue date: 2003Os bancos, na sua atividade de captar e emprestar recursos, estäo sujeitos a diversos tipos de risco. À medida que cresce o volume de clientes e de operações, aumenta a dependência de sistemas de avaliação de riscos de clientes, que sejam capazes de agilizar e racionalizar as análises, mas precisos nas suas atribuições de rating. O presente trabalho avalia o sistema de risco de crédito de uma grande instituição bancária brasileira, questionando a precisão do seu modelo para empresas do comércio varejista e atacadista do Nordeste brasileiro. O desempenho do modelo é, também, comparado ao de outras duas formulações bastante exploradas na literatura acadêmica, os modelos Kanitz e o modelo Z1C de Pereira da Silva. Foi utilizada a técnica de Back Testing para Erros do Tipo I e II , para os três modelos, em amostras de devedores com operações em atraso há mais de 60 dias e tomadores com limites de crédito há mais de 120 dias. A pesquisa propõe elucidar dúvidas dos analistas e gestores do banco que, por vezes, questionam a precisão da classificação para determinados clientes, havendo situações em que é sugerida mudança do risco atribuído. Outro problema que motiva a pesquisa é a reconhecida necessidade tornar mais técnicas as decisões de empréstimos, por parte de analistas e gerentes, mediante o aprofundamento das ferramentas utilizadas pelo banco e de disponibilização de conhecimentos sobre crédito. Além de proporcionar consolidação de informações, parcialmente tratadas em diversos compêndios e produções acadêmicas, o trabalho mostrou que o modelo da instituição financeira tem nível de acerto elevado para empresas não propensas à perdas, mas precisão insuficiente para tomadores com possibilidade de default. Contudo, o modelo do banco é mais eficiente do que os dois outros testados
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Zheng, Bibo. "Multiresolution fixation of a binocular vision system." Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-07112009-040450/.
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Arrale, Abdikarim M. (Abdikarim Mohamed). "Z1 Dependence of Ion-Induced Electron Emission." Thesis, University of North Texas, 1993. https://digital.library.unt.edu/ark:/67531/metadc277977/.
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Knowledge of the atomic number (Zt) dependence of ion-induced electron emission yields (Y) can be the basis for a general understanding of ion-atom interaction phenomena and, in particular, for the design of Zrsensitive detectors that could be useful, for example, in the separation of isobars in accelerator mass spectrometry. The Zx dependence of ion-induced electron emission yields has been investigated using heavy ions of identical velocity (v = 2 v0, with v0 as the Bohr velocity) incident in a normal direction on sputter-cleaned carbon foils. Yields measured in this work plotted as a function of the ion's atomic number reveal an oscillatory behavior with pronounced maxima and minima. This nonmonotonic dependence of the yield on Zx will be discussed in the light of existing theories.
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Ramraj, Riona. "Exploring star formation in dwarf galaxies at Z1." Master's thesis, University of Cape Town, 2014. http://hdl.handle.net/11427/9183.
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Includes bibliographical references.This dissertation presents the first H α measurements of star formation rates (SFRs) for dwarf galaxies at z~1 (when the Universe was approximately half its current age) using the Hubble Space Telescope (HST).We target a sample derived from the Redshift One LDSS3 Emission Line Survey (ROLES), which used [OII]3727 as a tracer of star formation to target very low stellar masses (M~10 8:5M) at this epoch. In this dissertation, we study these low mass ROLES galaxies using near-infrared slitless spectroscopy from HST. We target and measure the luminosity of the H α emission line. Even though H_ is a more direct SFR indicator, H α derived SFRs still need to be corrected for dust which is normally done using Balmer decrement measurements that are not available for our spectra. We find that using SED-fitted dust estimates, in the V-band, underestimates the extinction in high mass galaxies, in agreement with a recent result obtained by Price et al. (2013). We instead derive an empirical mass-dependent dust correction to take into account the extra extinction needed in high mass galaxies. We compare our dust corrected H α SFRs to the [OII] SFRs from ROLES. The [OII] SFRs were calculated using a mass-dependent empirical correction derived for galaxies in the Local Universe (Gilbank et al. 2010a). We find that the empirically corrected [OII] SFRs agree quite well with our dust corrected H α SFRs, having a slope of 1.6±0.7. This confirms that the mass-dependent empirical correction to [OII] works at z~1. We study the H α SSFR-mass relation for galaxies. We confirm previous results that at similar redshifts, low mass galaxies form their stars later and on longer timescales than high mass galaxies. However, our study probes down to lower limiting SFRs and lower stellar masses than any other previous studies, placing tighter constraints on galaxy evolution at this epoch.
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Zimmerman, Rosalind Kane. "Maize alpha-amylase: purification and properties and induction by gibberellic acid." Thesis, Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/80140.
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Alpha-amylase synthesis can be induced in wheat and barley half-seeds by addition of gibberellic acid (GA) to the incubation medium. In maize, induction in de-embryonated kernels by exogenous GA has been reported in some studies but not others.
Alpha-amylase induction was investigated in maize by measuring activity in extracts from whole and de-embryonated kernels incubated with and without GA during germination. Alpha-amylase activity was first detected on the 3rd day of germination in whole kernels and GA-treated endosperms and on the 4th day in the controls. Thereafter both whole kernels and GA-treated endosperms followed approximately the same time course in α-amylase activity with the control lagging a day behind. Studies indicated that maximum α-amylase activity occurred on the 7th day in whole kernels and GA-treated endosperms and the 8th in control endosperms.
Maize α-amylase was purified using differential solubility, column chromatography, glycogen precipitation and polyacrylamide gel electrophoresis, of these, the best purification method was glycogen precipitation.
Maize α-amylase exhibited isozymes. The isozyme patterns were qualitatively similar in all samples and throughout incubation. Wheat and barley α-amylase isozymes have been divided into two groups on the basis of a number of characteristics. Genetics analysis revealed these isozymes to be the result of two multigene families. To shed light on the genetic basis of the maize α-amylase isozymes, physicochemical characterization was initiated. Studies of pH and temperature profiles and optima showed no differences between maize isozymes. The pH optima was pH 5 and the temperature optima was about 37°C.Master of Science
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Li, Ning. "Computer methods for the study of Han4-Z14 : an intelligent approach to the computing of Chinese writing history." Thesis, University of Kent, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.358744.
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Thiboutot, Steve. "Courbes elliptiques, représentations galoisiennes et l'équation x2+y3=z5." Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=27423.
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The diophantine equation sp2 + y sp3 = z sp5 eqno(1) as an infinite number of integer solutions with gcd(x,y,z) = 1. Call (F, G, H) a parametrised solutions of (1) if F, G, and H are non-trivial homogeneous polynomials in Q (s, t) with gcd(F, G, H) = 1 and $F(s, t) sp2 + G(s, t) sp3 = H(s, t) sp5$ for all s, t $ in$ Z. The integer solutions of (1) may be written as a disjoint union of parametrised solutions. A theorem of Beukers states that the number N of such parametrised solutions is finite. However, only few parametrised solutions of (1) are known. Establishing a link between the mod 5 Galois representations coming from some elliptic curves and the parametrised solutions of (1), we find new parametrised solutions and indicate a way to find a bound for N.
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Ferreira, Graziele. "Comunidade de pescadores artesanais no Lago de Itaipu - conflitos territoriais na Colônia Z11 de São Miguel do Iguaçu/PR." Universidade Estadual do Oeste do Parana, 2014. http://tede.unioeste.br:8080/tede/handle/tede/34.
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Previous issue date: 2014-04-11This research aims to analyze the formation of the fishing territory in Itaipu Lake, specifically in the fishing town of Colony Z11, in São Miguel do Iguaçu, Paraná State, Brazil. The element that motivated the study was the understanding of the formation process of this fishing territory: a territory built (from flooding), imposed on the population, with varied uses and conflicts involving different actors with different interests, such as artisanal fishermen and small farmers, Ministry of Fisheries and Aquaculture, Fishing Colony and ItaipuBinacional. For this study, the methodology used was based on literature reading, on statistics survey of artisanal fisheries in Brazil and in the Itaipu Lake, as well as on public policy in the fishing sector, on the historical process of fishing colonies, and on field work that include interviews and questionnaires. From our results, it is worth noting that the fisherman of Colony Z 11 is a fisherman because of the reality imposed; he fishes in an artificial lake, a territory full of varied subjects and conflicts; practices pluriactivities; lives in a discontinuous community (geographically distant from each other); and fishing, besides craft, is an important source of income. Nevertheless, reality shows the activity weakened by the difficulties in the extraction, production and marketing of fish circuit. In the riverine communities of Itaipu Lake, many family farmers, farm workers and even urban farmers began to engage in fishing activities frequently since the formation of Itaipu Lake. This new alternative income and life spans customs, way of life, now interrelated, forming a new territory as a result of upgrading and new power relations. This new social subject reinvents itself and expands territorially, in a conflictual space.
Esta pesquisa objetiva analisar a formação do território da pesca no Lago de Itaipu, especificamente na localidade pesqueira da Colônia Z11, do município de São Miguel do Iguaçu, Estado do Paraná, Brasil. O elemento que motivou o estudo foi a compreensão do processo de formação deste território pesqueiro: um território construído (a partir do alagamento), imposto à população, com variados usos e conflitos, que envolvem variados agentes com diferentes interesses, como os pescadores artesanais e os pequenos agricultores, o Ministério da Pesca e Aquicultura, a Colônia de Pescadores e a Itaipu Binacional. Para este estudo, a metodologia utilizada baseou-se em leituras bibliográficas, no levantamento de dados estatísticos da pesca artesanal no Brasil e no Lago de Itaipu, bem como nas políticas públicas do setor pesqueiro, no processo histórico das colônias de pesca, e nos trabalhos de campo que contemplam entrevistas e aplicação de questionários. Dos resultados obtidos, cabe destacar que o pescador da Colônia Z 11 é pescador pela realidade imposta; pesca em um lago artificial, um território repleto de sujeitos variados e de conflitos; pratica a pluriatividade; vive em comunidade descontínua (distante geograficamente uns dos outros); e a pesca, além de um ofício, é importante fonte de renda. Não obstante, a realidade mostra a atividade fragilizada pelas dificuldades no circuito da extração, produção e comercialização do pescado. Nas comunidades ribeirinhas ao Lago de Itaipu, muitos agricultores familiares, trabalhadores rurais e até urbanos passaram a exercer a atividade pesqueira frequentemente a partir da formação do lago de Itaipu. Essa nova alternativa de renda e de vida abarca costumes, modo de viver, agora inter-relacionados, formando um novo território, como resultado da readaptação e das novas relações de poder. Esse novo sujeito social reinventa-se e amplia-se territorialmente, em um espaço conflituoso.
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Belaribi, Smail. "Stratigraphy, sedimentology and diagenesis of Z1-Z2 units, UK North Sea." Thesis, University of Newcastle Upon Tyne, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.297496.
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Schönfeld, Susanne, and Andreas Reinstaller. "The effects of gallery and artist reputation on prices in the primary market for art: a note." Inst. für Volkswirtschaftstheorie und -politik, WU Vienna University of Economics and Business, 2005. http://epub.wu.ac.at/342/1/document.pdf.
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This paper advances a decision theoretical foundation for pricing scripts by means of a simple model of product differentiation implementing the undercut-proof equilibrium concept. We argue that while sociological factors play undoubtedly an important role, economic analysis can complement the insights from economic sociology on pricing in the primary art market. Our model analyzes the effects of the gallery's and the artist's reputation on the price the gallery charges. The results suggest that prices positively correlate with an artist's reputation and negatively correlate with a gallery's reputation. The model may therefore explain the results of recent empirical studies that have led to similar results. (author's abstract)Series: Department of Economics Working Paper Series
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Fink, Gerhard, and Nigel Holden. "Collective culture shock. Contrastive reactions to radical systemic change." Forschungsinstitut für Europafragen, WU Vienna University of Economics and Business, 2002. http://epub.wu.ac.at/802/1/document.pdf.
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Many countries are going through severe transitions as they move from one system of economic management to another, experiencing a traumatic state which we term collective culture shock. Taking a cue from psychology, we suggest that collective culture shock can be seen as comprising four components: integration, assimilation, separation, and marginalisation. The movement towards free market economic systems calls for complex institutional adjustments, but these seem very difficult for societies to introduce in a systematic way. In order to exemplify collective culture shock, we examine four countries (including one country group): Russia, East Central Europe, South Africa, and Japan. Our treatment of these countries will show how collective culture shock is the product of complex economic, social and political forces specific to each situation. We hope to demonstrate that the phenomenon of collective culture shock is an important conceptual tool for managers responsible for international business strategy to help them to understand the complexities of change - or rather resistance to change - in transitional economies. (author's abstract)Series: EI Working Papers / Europainstitut
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Lee, Martin Robert. "The sedimentology and diagenesis of the Raisby Formation (Z1 carbonate), northern England." Thesis, University of Newcastle upon Tyne, 1990. http://hdl.handle.net/10443/3631.
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The Raisby Formation is the basal Zechstein (Upper Permian) carbonate, that crops out in northeast England. It was deposited in environments ranging from shallow water, above wave base, into a deeper water carbonate slope. The shallow water sediments are skeletal wackestones and packs tones which contain some sandstone horizons, whereas those deposited in deeper waters are mudstones, incorporating resedimented carbonates of variable thickness and extent. Many slope sediments were lithified early, forming nodular horizons. These cements, dominantly high magnesian calcite and aragonite, also occluded intra-skeletal pores, and were followed by the precipitation of framboidal pyrite. Early lithification of slope sediments had a significant influence on their stability, and response to resedimentation. Much of the Raisby Formation which was deposited on lower parts of the slope, was removed during an episode of catastrophic slope failure close to the end of first cycle carbonate deposition. During early burial, some sediments which were lithified early, neomorphosed to low-magnesian calcite microspar, which at a few localities was accompanied by the formation of coarsely crystalline calcite concretions. At the same time, or slightly earlier, sediments which did not lithify early, and some of those which did, were dolomitized and replaced by gypsum and anhydrite. Replacement by both dolomite and calcium sulphates was directly related to the deposition of the Hartlepool Anhydrite Formation. During burial, following calcium sulphate precipitation, the formation was relatively diagenetically inactive. Patchy Cu-Pb-Zn mineralization may have resulted from thermochemical reduction of anhydrite, in association with methane, and base metal-rich fluids derived from the Palaeozoic basement. During Tertiary uplift of the formation, a meteoric aquifer was established, which led to dissolution and calcitization of dolomite, anhydrite, and gypsum, and the precipitation of calcite cements. The calcite cements are associated with different types of iron and clay minerals and internal sediments. Luminescence petrography and stable isotope geochemistry demonstrate that most calcitization and calcite cementation was concentrated in two areas of the aquifer; a distal zone where fluids of elevated temperatures calcitized dolomite, gypsum and anhydrite, and precipitated pyrite, marcasite, barite and fluorite, and a proximal zone in which calcite cementation and dolomite calcitization was driven by CO₂degassing of calcite saturated, oxic groundwaters.
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Rashid, Mamunur. "Inference on Logistic Regression Models." Bowling Green State University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1214165101.
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Van, Duysen Jean-Claude. "Relations entre la microstructure et les propriétés mécaniques d'un acier ferritique au chrome-molybdène à basse teneur en carbone de type Z10 CDNbV 9-2." Grenoble 2 : ANRT, 1987. http://catalogue.bnf.fr/ark:/12148/cb37610569x.
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Zohrabyan, Larisa. "Développement des cristaux liquides stabilisé par des polymères pour les applications en photonique." Thesis, Université Laval, 2008. http://www.theses.ulaval.ca/2008/25219/25219.pdf.
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Van, Duysen Jean-Claude. "Relations entre la microstructure et les propriétés mécaniques d'un acier ferritique au chrome-molybdène à basse teneur en carbone de type Z10 CD Nb V9-2." Paris 11, 1987. http://www.theses.fr/1987PA112133.
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L'évolution des caractéristiques mécaniques au cours de traitements de vieillissement de longue durée entre 400 et 625°C ainsi que le comportement en fluage à 500 et 550°C de l'acier ferritique Z 10 CD Nb V 9-2 (commercialisé sous l'appellation EM 12) sont essentiellement régis par la précipitation d'une phase riche en Fe, Cr, Mo et par l'appauvrissement en molybdène de la solution solide qui résulte de cette précipitation. Cette phase intermétallique n'est identique à aucune phase connue jusqu’ici.
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Uribe, Erazo Javier Martín. "Sistema de re-inyección de agua producida aplicada a la plataforma Offshore Z1-8-A." Bachelor's thesis, Universidad Nacional Mayor de San Marcos, 2013. https://hdl.handle.net/20.500.12672/12574.
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Describe la implementación del nuevo sistema de re-inyección de agua de formación, en la plataforma albacora de BPZ exploración y producción S.R.L. El Lote Z1 es un área de concesión para exploración y explotación de hidrocarburos, ubicada sobre el zócalo continental en el Noroeste del Perú, frente a la costa de los distritos de Tumbes, Zarumilla y Zorritos, en la región Tumbes; tiene una extensión de 2 994,67 km2. La plataforma Z1-8-A Albacora es una instalación de exploración y explotación de hidrocarburos, ubicada en el Lote Z1; se encuentra ubicada en el mar, a 29 km de la población de Zorritos y a 25 km a la Caleta La Cruz. BPZ Exploración & Producción S.R.L. en adelante BPZ cuenta actualmente con facilidades de producción de agua, gas Asociado y crudo en plataforma AX08-Albacora ubicada en el Lote Z1-8-A.Trabajo de suficiencia profesional
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Nascimento, Deíse Santos do. "Mediação da Informação: estudo das práticas na Colônia de Pescadores “Benjamin Constant” Z5 em Lucena-PB." Universidade Federal da Paraíba, 2017. http://tede.biblioteca.ufpb.br:8080/handle/tede/9700.
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This is an ethnographic research of artisanal fisheries in the municipality of Lucena-Pb and aimed to analyze the practices of information of mediation developed by the Fishery Community "Benjamin Constant, Z-5" for artisanal fisheries, and aims specifically to map the activities of fishermen on the beach of Lucena; to characterize the socioeconomic profile of fishermen and managers from the fishery community; to observe in what is based the relationship established between fishery community and fishermen; to understand aspects present in oral narratives of managers and fishermen from fishery community that can constitute as barriers in the process of information of communication; to present guidelines for the construction of an information regime and an information policy which promotes conversation between the fishermen from fishery community, the local fishermen and other institutions operating in the fisheries sector. This paper has as theoretical reference the literature from the fields of Science of Information and Sociology, through the point of view of sociological theory of secret from George Simmel, specifically addressing the three aspects of this theory: the secret, silence and conflict, and based on information as a social phenomenon, with support in the social paradigm from Capurro, regime and policy of information and studies from mediation of information. From the methodological point of view, the approach is ethnographic and qualitative, in which it was used the action research, the participant observation and the oral history to collect data, which were analyzed, emphasizing the significance of the facts and speeches as values the method of content analysis. The presentation of the analysis of the data was performed in two stages: initially the data collected through the registration effected with the fishermen and managers of the colony of fishermen and then performed the analysis made from the oral history narratives, with the lines and graphical representation, for best viewing set up relations and aspects of sociability. The final considerations present our impressions about the research field and the investigated object, and displays directions for future managers to make a more participative management, prioritizing the implementation of information practices that meets the needs of artisanal fisheries from the fishery community "Benjamin Constant", Z5.
Trata-se de uma pesquisa etnográfica realizada com pescadores artesanais no município de Lucena-Pb e teve como objetivo geral analisar as práticas de mediação da informação desenvolvida pela Colônia de Pescadores “Benjamin Constant, Z-5” para os pescadores artesanais e, como objetivos específicos: fazer o mapeamento dos pescadores em atividade na praia de Lucena; caracterizar o perfil socioeconômico dos pescadores e dos gestores da Colônia de pesca; observar como se constitui a relação estabelecida entre a Colônia de pesca e os pescadores; compreender nas narrativas orais dos gestores da Colônia de Pesca e, dos pescadores, os aspectos que possam se constituir como barreiras no processo de comunicação da informação; apresentar diretrizes para a construção de um regime de informação e uma política de informação que promova o diálogo entre a Colônia de pescadores, os pescadores locais e demais instituições que atuam no segmento da pesca. Teve como base teórica a literatura da área Ciência da Informação e da Sociologia, pelo olhar da teoria sociológica do segredo de George Simmel, abordando especificamente os três aspectos desta teoria: o segredo, o silêncio e o conflito, pautando-se na informação como um fenômeno social, com respaldo no paradigma social de Capurro, do regime e política de informação e dos estudos de mediação da informação. Do ponto de vista metodológico, a abordagem é etnográfica e qualitativa, a partir da utilização da pesquisa-ação, da observação participante e da história oral para a coleta dos dados, os quais foram analisados priorizando-se o significado dos fatos e das falas, como preza o método de análise de conteúdo. A apresentação da análise dos dados foi realizada em dois momentos: incialmente coletou-se os dados através do cadastramento efetivado com os pescadores e gestores da colônia de pescadores e, em seguida, apresentou-se a análise feita a partir das narrativas da história oral, com a exposição das falas e representação gráfica, para melhor visualização de relações constituídas e dos aspectos de sociabilidade. As considerações finais abordam as impressões acerca do campo da pesquisa e do objeto investigado apresentando, conforme proposto num dos objetivos específicos, direcionamentos para que os futuros gestores possam fazer uma administração mais participativa, priorizando a realização de práticas de informação que atendam as necessidades dos pescadores artesanais, associados à Colônia de pescadores “Benjamin Constant”, Z5.
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Stephany, Fabian. "It Deepens Like a Coastal Shelf: Educational Mobility and Social Capital in Germany." Springer, 2018. http://dx.doi.org/10.1007/s11205-018-1937-9.
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The prospects for the next Generation - whether young people, regardless of
their backgrounds, have equal chances of social success - pose a momentous problem for
modern societies. Inequality of opportunity, often reflected by social immobility, is a threat
to the egalitarian promise and the stability of your society. This work argues that social
capital transmission plays an important role for the chances of social success in Western
societies. For the example of Germany, it is reasoned that weak social capital environments
deepen existing disadvantages. Even though all levels of education are easily accessible
and affordable, Germany has one of the lowest levels of educational mobility among the
industrialized countries of the world. Problems appear to be systematic, since the decision
regarding entry into higher secondary education is made at early age and is left, in most
cases, with the parents, who rely on their own educational trajectory. Outside of the school
environment, differences in social capital inheritance explain educational immobility. With
the use of the German Socio-Economic Panel survey from 1984 to 2014, various analyses
about the relation between social capital and educational success are performed. Social
capital, which is helpful for educational and social success, clearly depends on the educational
family background. This indirect link has been disregarded in past contributions.
Alternative forms of schooling, such as comprehensive and all-day education, as well as a
delay of the decision regarding entry into higher education, could help improving unequal
social capital inheritance.
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Clebsch, Daniel Paulo. "Aspectos da utilização de zymomonas mobilis Z1-81 floculante na produção de etanol e glucose-frutose oxidorredutase /." Florianópolis, SC, 1998. http://repositorio.ufsc.br/xmlui/handle/123456789/77949.
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Grande, Pedro Luis. "Estudo do alcance de íons pesados (29 menor ou igual Z1 menor ou igual 83) em alvos de berílio, carbono e dióxido de silício." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 1989. http://hdl.handle.net/10183/29703.
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Neste trabalho estudamos experimentalmente, através da técnica de retroespalhamento de Rutherford, a distribuição de vários elementos C295. 2.15 83) implantados em filmes de Be, C e SiOz, na faixa de energia entre 10 e 400keV. Os resultados experimentais foram comparados com as predições teóricas desenvolvidas por Ziegler. Biersack e Littmark C2BL). Nossos resultados apresentam várias características distintas: para substratos de SiOz, obtivemos um acordo muito bom entre valores teóricos e experimentais do alcance projetado Rp e alguns desvios na largura do perfil de implantação ARp. Contudo, para os alvos de C e Be. encontramos grandes discrepâncias com os cálculos de ZBL. Para Bi, Pb, Au, Yb, Er, Eu e Cu em C e para Bi, Pb e Cu em Be. os valores experimentais de alcance excedem os teóricos em mais de 40%, ficando em média entre 25 e 30%. As diferenças são praticamente independentes da energia de implantação. Além disso, as larguras longitudinais do perfil de implantação também são fortemente subestimadas pelos cálculos Cchegando até a um fator 2). É mostrado que esses desacordos não podem ser atribuídos a imprecisões no potencial elástico ZBL ou ao poder de freamento eletrônico ZBL. Entretanto, se considerarmos a inclusão de colisões inelásticas no cálculo do poder de freamento nuclear, o poder de freamento total pode ser significativamente reduzido, nos casos de íons pesados incidindo em alvos leves. Como conseqüência deste tratamento, conseguimos obter um excelente acordo com os nossos resultados experimentais.We have experimentally studied by using the Rutherford backscattering technique the range profiles of a variety of elements C29 5. 214 <83) implanted into Be, C and SiOz films at energies ranging from 10 to 400keV. The experimental results were compared with the predictions developed by Ziegler, Biersack and Littmark CZBL). Our results show several distinct features : for SiOz substrates , we have obtained an overall good agreement between the theoretical and experimental values of the projected ranges CRO and some deviations in the projected range stragglings CàRp). Instead for C and Be targets, we have found large discrepancies with the ZBL calculations. In fact, for Pb, Bi, Au, Yb, Er, Eu and Cu into C film and for Bi, Pb and Cu into Be film, the experimental range values exceed the theoretical oves by as much as 40% and on average around 25-30% . The differences are independent of the implantation energy. In addition, the range stragglings are also strongly under-estimated by the calculations Creaching up to a factor 2). It is shown that this disagreements can not be attributed to inaccuracies of the ZDL elastic potential or to the 2BL electronic stopping power. However if we consider the inclusion of inelastic collisions in the calculation of the nuclear stopping power, the total stopping power and the scattering angles CC.M. system) can be significantly reduced, mainly in the case of heavy ions impinging into light targets. As a consequence of this treatment, we have obtained an excellent agreement with our experimental data.
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Hromatka, Heike, and Andreas Resch. "Kreativwirtschaft in Wien - eine Jahrhundertperspektive." WU Vienna University of Economics and Business, 2005. http://epub.wu.ac.at/3454/1/ci_hromatka_resch.pdf.
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Im vorliegenden Paper werden erstmals die endgültigen Ergebnisse der Wiener Arbeitsstättenzählung 2001 herangezogen um die Beschäftigtenzahlen in den Wiener Creative Industries (CI), gegliedert nach der "Wiener Definition" zu erstellen. Gegenüber der bisher vorliegenden, auf einer vorläufigen Auswertung basierenden Auszählung erhöht sich die Gesamtzahl der in den Wiener CI Beschäftigten um 13 Prozent auf 135.631.
Dieses neue Ergebnis dient als Ausgangsbasis für den Vergleich mit den CI-Beschäftigtenzahlen im Jahr 1910 für das Beschäftigungsdaten aus der damaligen Volkszählung vorliegen. Bei dem Vergleich treten methodische und inhaltliche Probleme auf, so dass die Bereiche Bekleidungserzeugung und -handel sowie Software/Multimedia/Spiele/Internet ausgespart werden. In den so definierten CI ist die Beschäftigtenzahl von 79.601 (1910) auf 93.155 Personen (2001) gestiegen, während die Gesamtzahl der Erwerbstätigen in Wien (jeweiliger Gebietsstand) von rd. einer Million auf 820.000 Personen und die Einwohnerzahl von rd. zwei Millionen auf 1,6 Millionen zurückgegangen ist.
Die Beschäftigtenzahl im Kernbereich "Content Origination" ist im Verlauf des 20. Jahrhunderts nur geringfügig gewachsen, von rd. 37.700 (1910) auf 41.100 (2001). Der Bereich "Manufacturing and Reproduction" wies mit einem Rückgang um 29,8 Prozent (von rd. 31.100 auf 21.900 Beschäftigte) eine wesentlich schwächere Schrumpfung als der gesamte Sekundärsektor auf. Zugleich konnte der Bereich "Exchange" mit einem Anstieg der Beschäftigtenzahl um 180 Prozent (von rd. 10.800 auf 30.200) erheblich stärker zulegen als der Handel generell. Diese Daten machen deutlich, dass von den CI in der Jahrhundertentwicklung stark positive Effekte auf die vor- und nachgelagerten Bereiche ausgingen, während der Kernbereich Content Origination im Hinblick auf die Beschäftigtenzahlen weitgehend stagnierte.(Autorenref.)Series: Creative Industries in Vienna: Development, Dynamics and Potentials
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Hölzl, Werner. "Entrepreneurship, Entry and Exit in Creative Industries: an explorative Survey." WU Vienna University of Economics and Business, 2005. http://epub.wu.ac.at/3453/1/Hoelzl_EntryExit.pdf.
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Petutschnig, Matthias. "Future Orientation and Taxes: Evidence from Big Data." WU Vienna University of Economics and Business, Universität Wien, 2015. http://epub.wu.ac.at/4483/1/SSRN%2Did2563548.pdf.
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The paper analyses whether various aspects of a country's tax system have a positive or negative
influence on individuals' attitudes towards the future. These attitudes are measured by an analysis
of Google search queries derived from Google Trends which allow constructing an online futureorientation
index for a sample of 58 countries. There results of this analysis indicate that capital
gains taxes and value added taxes discourage future-oriented behaviour. Also, high personal income
tax rates at the lowest income brackets discourage, whereas - surprisingly - the top marginal rates
could positively influence an individual's future orientation. The paper contributes to existing
research in three ways: First, it expands the existing tax literature by providing evidence that taxes
can influence very fundamental personal values, such as individuals' general attitudes towards their
future. Second, it contributes to a vast body of cross-cultural studies on future orientation by
introducing tax law. Third, by using Internet search patterns the paper introduces these large,
automatically gathered data sets into scientific tax research, thereby opening the possibility for
further research opportunities. (author's abstract)Series: WU International Taxation Research Paper Series
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Alex, Jürgen. "Zum Einfluß elementarer Sätze der mathematischen Logik bei Alfred Tarski auf die Entstehung der drei Computerkonzepte des Konrad Zuse." Doctoral thesis, Universitätsbibliothek Chemnitz, 2006. http://nbn-resolving.de/urn:nbn:de:swb:ch1-200600901.
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Sampath, Vinodh Rajan. "Quantifying scribal behavior : a novel approach to digital paleography." Thesis, University of St Andrews, 2016. http://hdl.handle.net/10023/9429.
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We propose a novel approach for analyzing scribal behavior quantitatively using information about the handwriting of characters. To implement this approach, we develop a computational framework that recovers this information and decomposes the characters into primitives (called strokes) to create a hierarchically structured representation. We then propose a number of intuitive metrics quantifying various facets of scribal behavior, which are derived from the recovered information and character structure. We further propose the use of techniques modeling the generation of handwriting to directly study the changes in writing behavior. We then present a case study in which we use our framework and metrics to analyze the development of four major Indic scripts. We show that our framework and metrics coupled with appropriate statistical methods can provide great insight into scribal behavior by discovering specific trends and phenomena with quantitative methods. We also illustrate the use of handwriting modeling techniques in this context to study the divergence of the Brahmi script into two daughter scripts. We conduct a user study with domain experts to evaluate our framework and salient results from the case study, and we elaborate on the results of this evaluation. Finally, we present our conclusions and discuss the limitations of our research along with future work that needs to be done.
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Lin, She Thon, and 許琮琳. "Quadratic Residue Codes Over Z16." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/70092676802196155067.
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碩士國立成功大學
數學系
87
SUMMARY Abstract-Quadratic residue codes over Z16 are Z16 -cyclic cyclic codes. We define such codes in terms of their idempotents and show that these codes also have many good properties which are analogous in many respects to properties of quadratic residue codes over a field.
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Rossi, Adam Joshua. "Demographic and Psychiatric Correlates of Suicide Attempt in a Nationally Representative Sample." Thesis, 2019. https://doi.org/10.7916/d8-an3c-zh15.
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The increasing prevalence of suicidal behaviors in the United States inflicts massive emotional and economic costs in the United States (CDC, 2012). Efforts to detect and prevent these behaviors have not resulted in overall reduction of these costs, and could be enhanced with new approaches to assessing risk for specific suicide outcomes (Klonsky & May, 2014). Several contemporary theories of suicide make distinctions between suicide outcomes (i.e., suicidal ideation, suicide attempt, suicide death) that are often conflated in studies of suicide risk (Joiner, 2005; O'Connor & Kirtley, 2018). The present research, borne of these theories, sought to examine whether known demographic and psychiatric risk factors for suicide help distinguish between respondents of a nationally-representative survey measure, who reported either a history of suicidal ideation, a history of suicide attempt, or neither of these experiences. Significant differences were observed when comparing individuals reporting a history of attempt or ideation with individuals reporting no suicide history across many of these factors. Significant associations were also observed when comparing those reporting a history of ideation and those reporting a history of attempt, suggesting that these factors may provide some degree of incremental validity for the detection of risk, specifically for suicide attempt. Demographically, race/ethnicity and level of education yielded the most significant distinctions between those reporting a history of ideation and history of attempt. Psychiatrically, antisocial and borderline personality disorders and a history of mania yielded the most significant distinctions between those reporting a history of ideation and history of attempt. These results could be applied in developing screening measures for individuals at increased risk for making suicide attempts, which carry their own emotional and economic costs when not resulting in death, and are also highly associated with eventual mortality by suicide. These applications as well as study limitations will be discussed in detail.
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"Coupled resonator decoupling networks for compact antenna arrays of advanced communication systems." 2014. http://repository.lib.cuhk.edu.hk/en/item/cuhk-1290678.
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Developements in next-generation advanced communication systems and devices have triggered multi-antenna systems for improved data throughput and transmission reliability. According to Shannon's theorem, to improve the channel capacity of a communication system, one method is to broaden the system bandwidth. Another method is to use the multiple-input-multiple-output (MIMO) technology. This technology uses multiple antennas at both transmitter and receiver to improve the channel capacity by several folds. Therefore, compact and broadband multi-antenna systems are very promising for future high-capacity wireless communication systems.In parallel to advances in MIMO technologies, there is an irreversible trend that more and more communication protocols together with their respective antennas and radio transceivers are integrated into one compact unit. The radio systems of different protocols may work in very closely adjacent frequency bands or even overlapped bands. The coexistence of these multiple antennas has also become a concern from both industry and academic communities.
However, since the number of antenna elements is increasing in more and more compact devices, the physical limitation on inter-element spacing cannot be easily transcended, which will lead to destructive mutual coupling interference as well as pattern/spatial dependent correlation. In a multi-antenna system, the signals at all antenna ports are coded differently either to increase the packet rate or simply because that they belong to different radio transceivers. If unwanted signals are coupled to the ports, the signal-to-noise ratio will be deteriorated. Furthermore, the far-field patterns of closely spaced antennas are highly correlated and the signal envelope correlation will become significantly large. All these negative impacts will greatly diminish the channel capacity and the data throughput. Such drawbacks restrain the use of multiple antenna systems. It is therefore vital to develop a simple, broadband and effective decoupling technique for compact multiple antenna systems/arrays in advanced communication systems.
The major objectives of this thesis are (1) to innovate a new antenna decoupling technique called shunt type of coupled resonator decoupling networks (S-CRDNs) for wireless mobile terminal antennas; (2) to develop the synthesis theory and the design methodologies of the shunt type of CRDNs (S-CRDN) for various of antenna arrays; (3) to extend the theory and the design concept to dual band S-CRDNs, three port S-CRDNs and a LTCC S-CRDN module for mobile terminal applications; (4) to develop a cascaded type of coupled resonator decoupling networks (C-CRDN) for base station and wireless routers antennas; (5) to innovate a novel decoupling technique for multiple element antenna arrays with dummy antennas arrays; and more importantly, (6) to explore innovative applications with experimentally verified superiority.
Based on the characteristics of the coupled antennas, the synthesis theory of S-CRDNs starts from a set of required admittance polynomials, the targeted coupling matrix can be obtained from the polynomials analytically for a second-order S-CRDN. Possible coupling topologies of S-CRDNs include, but not limited to, a second-order all pole S-CRDN, a second-order S-CRDN with source-load coupling, a high-order S-CRDN network for dual band applications and a three port S-CRDN for three-element antenna arrays. Moreover, the concept of a “one-fit-all” S-CRDN module base on LTCC technology is also proposed and investigated, which makes an integrated S-CRDN module antenna independent as long as the frequency range matches.
The general theory of C-CRDN is developed in this thesis based on the circuit model of a 4-port coupled resonators network, which is proposed to solve the antenna decoupling problem between two base station antennas, to which a high level of isolation between two adjacent frequency bands is required, for the first time. This type of CRDN is particularly useful when one antenna transmitting very high power energy in a vicinity to a receiver antenna that works in an adjacent frequency band with very high sensitivity.
A decoupling technique with appropriately designed dummy elements and their passive complex loading is also proposed in this thesis. The technique employs the characteristics of non-radiating antenna elements (dummy elements). Multiple dummy elements can be introduced to alter the mutual coupling characteristic the radiating antennas in the original compact array. Therefore, this technique is more suitable for decoupling problem of an array with multiple elements. It is demonstrated that for a four-element compact array, four dummy elements are sufficient to decouple the four radiating elements in a broadband sense. Additionally, each radiating element can be independently matched. This decoupling technique can be extended to antenna arrays with a high number of radiating elements.
Finally, necessary and important figures of merit for benchmarking a multiple element antenna array are introduced. Prototypes of multi-antenna systems with and without using proposed decoupling techniques are fabricated, measured and compared. A large number of experimental results have demonstrated the superiority and the significance of the proposed decoupling techniques for compact antenna arrays of advanced wireless communication systems.
下一代無線通訊系統與設備的飛速發展，極大的促進了多天線系統的開發與應用。多天線系統天生具有高數據吞吐率，并能夠確保傳輸的穩定性。根據香農定律，若想要提高一個系統的信道容量，要麼可以展寬系統帶寬，要麼可以適用多輸入多輸出（MIMO）系統。MIMO技術在發射端和接收端安置多個天線，以同時發送多路數據，大大提高了數據的吞吐率和信道容量。理想的狀態下，信道容量隨著收發天線的個數可以線性成倍增加。因此，新一代的小型化多天線系統正在成為未來發展的趨勢。
與此同時，現今無線通訊系統的發展趨勢越來越朝著小型化，集成化以及多功能化發展。這就意味著，越來越多的通信協議及其收發機和天線，將會集成到一個越來越小的終端設備上。另外由於頻譜資源的稀缺，這些共同工作的系統的頻帶越來越寬，頻帶之間的距離也越來越近。這些多天線的共存問題，也日益成為學術界和工業界關心的焦點問題。
但是，當終端的尺寸越來越小，而天線的個數越來越多的時候，天線之間的物理距離這個瓶頸是無法逾越的。如此受限的距離，不但造成了天線之間的相互干擾較大，也造成了他們方向圖和信道的強相關。在多天線系統中，各個天線處的信號編碼是不同的（包括提高數據速率和提高通信可靠性兩種不同的模式）。如果無用的信號耦合到了不該到的端口或者天線處，就會極大的影響信噪比和通信質量。另外，如果多天線的方向圖和信道是相關的話，信號的包絡相關性就會變得異常的大。這些都是嚴重影響多天線系統的性能的因素。因此，設計一種簡單的，寬帶的，有效的解耦技術，對於多天線系統是至關重要的。
本論文的主要目標是：（1）開發一種新的天線解耦技術，叫做並聯型耦合諧振腔解耦網絡，專門針對手機終端。（2）研究針對此解耦網絡的綜合設計手段，以針對不同的多天線陣列，都能有效的設計。（3）將此技術推廣到雙頻，多頻，多端口的多天線系統中。并研究利用低溫共燒陶瓷技術實現此類器件的小型化。（4）開發另一種級聯型耦合諧振腔解耦網絡，專門針對基站和路由器應用。（5）開發一種利用“假”天線進行解耦的新型技術。更重要的是（6）在實際使用場景中驗證所提出的各種解耦技術的有效性。
並聯型耦合諧振腔解耦網絡的綜合方法，需要受限根據耦合天線的特性和參數，得到一組電抗多項式，對於二階的網絡，所需要的耦合係數可以有這些多項式解析得到。實際上，並聯型耦合諧振腔解耦網絡的拓撲結構是多樣的，其中包括：兩階無交叉耦合型，兩階有交叉耦合及源負載耦合型，高階針對多頻的網絡以及三端口的網絡，專門針對三單元天線陣列。從並聯型耦合諧振腔解耦網絡，可以衍生出一種非常重要的基於低溫共燒陶瓷技術的“全能型”解耦網絡。這種網絡在頻率確定的情況下，可以適應各種不同的天線形式和耦合，非常適合在手機終端上廣泛採用。
本論文還討論了針對級聯型耦合諧振腔解耦網路的一般理論，以及其對應的電路模型和網絡參數。這種類型的網絡非常適合解決需要極高隔離度的基站天線解耦問題。這種網絡在本文中是業界首次提出的針對發射天線對領進頻帶接收機強幹擾的微波無緣網絡解決方案。
另外，一種採用“假”天線配合其電抗負載進行解耦的方法也將在文中提到。這種技術利用了並不輻射的“假”天線的寄生特性，通過引入若干不同空間排布的假天線陣，來解決原有天線陣的強互耦問題。這種方法的優越性是可以針對多種不同單元數和不同陣列排布的陣列。
最後，本文將會一一討論多種評估多天線系統性能指標的參數。包括隔離度，效率，包絡相關性，信道容量乃至吞吐率。作為比較，多種多天線系統，包括採用解耦網絡技術和不採用解耦網路技術的天線陣的各種性能參數，都在文中做了詳細比較。大量的實驗證明了採用解耦網絡的多天線系統的優越性。
Zhao, Luyu.
Thesis (Ph.D.)--Chinese University of Hong Kong, 2014.
Includes bibliographical references.
Abstracts also in Chinese.
Title from PDF title page (viewed on 26, October, 2016).
Detailed summary in vernacular field only.
Detailed summary in vernacular field only.
Detailed summary in vernacular field only.
Detailed summary in vernacular field only.
Detailed summary in vernacular field only.
Detailed summary in vernacular field only.
Detailed summary in vernacular field only.
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"A potential mechanism for follicle activation in zebrafish: the role of IGF-I/Ybx1 in the primary growth follicle of zebrafish." 2015. http://repository.lib.cuhk.edu.hk/en/item/cuhk-1291476.
Full textAbstract:
A critical step in mammalian ovarian follicle development is the transition of gonadotropin-independent preantral follicles to the gonadotropin-dependent antral follicles. However, the molecular mechanisms underlying the transition or early follicle activation are largely unknown. Using zebrafish as the model, we have recently identified Y-box binding protein 1 (YB-1, Ybx1/ybx1), a transcription factor and mRNA binding protein, in early developing oocytes whose expression level was very high in the gonadotropin-independent primary growth (PG) stage but drastically diminished at the beginning of the gonadotropin-dependent secondary growth (SG) stage, i.e., previtellogenic (PV) stage. This has raised interesting questions on the role of Ybx1 in follicle activation as well as how it is controlled. To provide clues to these issues, we first analyzed the regulation of Ybx1 during PG-to-PV transition under IGF-I treatment and the associated signaling pathways. IGF-I, an endocrine/paracrine factor in the growth axis, stimulats Ybx1 phosphorylation via PI3K/Akt but not MAPK pathway in PG follicles. Interestingly, the phosphorylation correlated well with the decline of Ybx1 protein level and the activation of the follicle from the PG follicle pool. This, together with our finding that zebrafish Ybx1 is exclusively produced in PG oocytes in large amount but suddenly disappears during PG-to-PV transition, has prompted us to wonder what the relationship between Ybx1 phosphorylation and degradation. Further experiments showed that Akt directly binds and phosphorylates Ybx1, leading the regulation of Ybx1, including its phosphorylation, cleavage, translocation and degradation, which in turn regulates gene expression and protein synthesis.In summary, as a multifunctional protein that may play a critical role in early follicle development, Ybx1 is subject to regulation by external factors such as IGF-I, which stimulated Ybx1 phosphorylation via PI3K/Akt but not MAPK pathway. Once Ybx1 is phosphoylated by Akt in the cytoplasm of PG follicle, on one hand, it will be cleaved and translocated to the nucleus to regulate gene expression. On the other hand, the phosphor-Ybx1 can also be degraded through the Ub-proteasome pathway, leading the release of free mRNA to further translation. All these promote the synthesis of many growth- and differentiation-related proteins, which will facilitate early follicle activation. Our findings suggest that the oocyte may serve as the headquarter to programme follicle activation and that the oocyte Ybx1 protein may play a critical role in this event. The delineation of the signaling pathways involved in IGF-I-induced Ybx1 phosphorylation and the regulation of Ybx1 as well as its function in gene transcription and protein synthesis during PG-to-PV transition will provide insight into the mechanism of early follicle activation and puberty initiation.
哺乳动物卵巢卵泡发育的一个关键步骤是从促性腺激素非依赖的窦前卵泡向促性腺依赖的窦状卵泡的转变过程。但是这一早期卵泡激活的分子机制却不是非常清楚。利用斑马鱼为模型，我们在早期发育的卵母细胞中发现一种名叫Y-box结合蛋白1 （YB-1, Ybx1/ybx1）的转录因子和mRNA 结合蛋白，它在促性腺激素不依赖的初级生长期卵泡（PG）中大量表达，但是在促性腺激素依赖的第二生长期卵泡（SG）,也叫卵黄发生前期(PV)中表达量大大降低。这引发我们猜想YB-1 可能在早期卵泡激活（PG-to-PV 转变）中发挥着重要作用，并且想知道它的这一表达量的巨变是如何被调控的。为了弄清楚这些问题，我们首先分析了IGF-I 处理下Ybx1 在PG-to-PV 的转变中是怎样被调控的，以及相关的信号通路。我们发现在PG 阶段，IGF-I 这种存在于生长轴中的内分泌／旁分泌因子，通过PI3K/Akt 而不是MAPK 通路促进Ybx1 的磷酸化。有趣的是，这种磷酸化的升高正好伴随着Ybx1 蛋白水平的下降以及PG 卵泡的激活。结合我们之前的发现：斑马鱼Ybx1 只在PG 卵母细胞中大量表达但在PG-to-PV 的转变过程中突然消失，促使我们猜想Ybx1 磷酸化和它的降解之间应该存在一定的关系。进一步的实验表明Akt 激酶直接结合并磷酸化Ybx1,导致一系列对Ybx1 调控，包括它的磷酸化，切割，转位以及降解，所有这些又将促进基因的表达调控及蛋白的合成。
总之， 多功能蛋白Ybx1 可能在早期卵泡发育过程中发挥着至关重要的作用。外界刺激因子，如IGF-I，通过PI3K/Akt 而非MAPK 途径促进Ybx1 磷酸化。一旦Ybx1 在PG 卵泡细胞质中被Akt 磷酸化，一方面Ybx1 将会被切割并且转位到细胞核中去调节基因表达，另一方面，磷酸化的Ybx1 还会通过泛素蛋白酶途径被降解，从而释放出mRNA 去进一步的翻译。所有这些将促进许多生长和分化相关的蛋白合成，从而促进早期卵泡的激活。我们的研究结果表明，卵母细胞很可能是程序性卵泡激活的核心部分，存在于卵母细胞中的Ybx1 蛋白在这一过程中起着关键作用。研究IGF-I 参与诱导的Ybx1 磷酸化的信号通路以及在PGto-PV 转变过程中对Ybx1 蛋白的调控和它在基因表达及蛋白合成中的作用，将有力的帮助我们弄清早期卵母细胞激活及青春期的启动机制。
Zhang, Lingling.
Thesis Ph.D. Chinese University of Hong Kong 2015.
Includes bibliographical references (leaves 104-127).
Abstracts also in Chinese.
Title from PDF title page (viewed on 06, October, 2016).
Detailed summary in vernacular field only.
Detailed summary in vernacular field only.
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"A study on nonverbal behaviors of humanoid robots." 2015. http://repository.lib.cuhk.edu.hk/en/item/cuhk-1291490.
Full textAbstract:
As humanoid robots move from science fictions to reality, and are gradually being used in education, health care, and entertainment areas, interactions between humans and humanoid robots are becoming critically important. Previous findings show that in human-robot interactions (HRI) people tend to communicate with humanoid robots as if they were humans, which requires humanoid robots to be behaviorally more humanlike and socially more sophisticated. Non-verbal behaviors (e.g. gaze cues and gestures) are essential communication signals in human-human interactions (HHI), and they are equally important in HRI. This thesis reports a study on nonverbal behaviors of humanoid robots in hope to facilitate more natural HRI. Through extensive HHI and HRI experiments, intuitive robot gaze cues and gestures are studied, and their impacts on HRI are demonstrated.Gaze cues can subtly mediate how human-human handovers take place. We conjecture that such effect also exists in human-robot handovers. Based on observations of the giver’s gaze behaviors during human-human handovers, several typical gaze patterns are extracted and transferred to a PR2 humanoid robot for carrying out robot-to-human handovers. In two consecutive HRI experiments the robot hands objects to human receivers while using different gaze patterns. Results show that where the robot gazes at and how it changes its gaze direction during the handover can significantly affect human receivers’ reaching time for the handed object and their subjective experience (likeability, anthropomorphism, etc.) of the handover.
Emblematic gestures are frequently used in HHI, because their meanings are self-contained and can be understood without spoken words, such as waving. We conjecture that emblematic gestures are also applicable to humanoid robots during HRI. Several commonly used emblematic gestures are identified and transferred to a NAO humanoid robot to be evaluated by human subjects. Results show that the perceived meanings of the robot’s emblematic gestures are generally consistent with the perceived meanings of a human’s emblematic gestures, but the recognition rate in the robot case is lower. To improve this situation, two design methods are implemented, i.e. by hand-puppeteering (designers manipulate the robot’s limbs with hands as if manipulating a puppet) and by motion mapping (human gesture trajectories are captured by an RGB-D sensor, and corresponding joint trajectories are mapped to the robot’s joints). Results show that gestures designed from the motion mapping method are faster and have larger range of motion, while gestures designed from the hand-puppeteering method are perceived subjectively as more likeable and as better conveying semantic meaning.
This research contributes to the design of humanoid robots’ nonverbal behaviors with theoretically and empirically grounded methodologies, and offers better understandings of gaze cues and gestures in both HHI and HRI. Findings from this research provide instructive and valuable references for many practical application scenarios involving interactive robots.
人形機器人從科幻小說變成現實，逐漸被應用於教育、醫療、娛樂等領域，這使得人們與人形機器人之間的交互變得至關重要。之前的研究發現，在人-機器人交互中，人們傾向於以與人溝通的方式與人形機器人溝通，這就需要人形機器人具有更加似人的行為和社交類經驗。非語言行為（例如注視和手勢）在人-人交互中是必要的溝通信號，在人-機器人交互中這些行為也同樣重要。本論文致力於研究人形機器人的非語言行為，以期促進更自然的人-機器人交互。通過廣泛的人-人交互和人-機器人交互實驗，我們研究了直觀的機器人注視行為和手勢行為，並展示了這些行為對人-機器人交互的影響。
注視信號在人-人傳遞物品時能夠起到微妙的調節作用，我們推測這種作用也存在於人-機器人傳遞物品的過程中。通過觀察人-人傳遞物品時物品給予者的注視行為，我們提取了幾種典型的注視行為模式，並將這些注視行為轉化到一台PR2 人形機器人上，來進行機器人向人傳遞物品的實驗。在兩次人-機器人交互實驗中，受試者接收由機器人傳遞的物品，在此過程中機器人會使用不同的注視行為模式。實驗結果表明，機器人注視哪裡以及如何改變它的注視方向，能夠顯著影響接收者伸手接物品的時間以及他們對於傳遞物品這一事件的主觀感受（喜愛程度，似人程度等）。
象徵性手勢廣泛應用於人-人交互中，這類手勢具有獨立的含義、可以不依賴於語言而被人理解，比如揮手。我們推測在人-機器人交互中象徵性手勢也可為人形機器人所用。我們將幾個常用的象徵性手勢轉化到一台NAO 人形機器人上，並由受試者進行評估。實驗結果表明，人們對機器人的象徵性手勢的理解與對人的象徵性手勢的理解大致相同，但在機器人情形下的識別率較低。為了改善這種狀況，我們提出了兩種設計方法，即通過手把手操縱（設計者像操縱木偶一樣操縱機器人的肢體來獲得手勢動作），和通過動作映射（用RGB-D 傳感器捕捉人的手勢軌跡，將相應的關節軌跡映射到機器人的關節上）。實驗結果表明，通過動作映射方法設計的手勢速度更快、動作幅度更大，通過手把手操縱方法設計的手勢在主觀上更令人喜愛、更好地傳達了語義含義。
本研究為人形機器人的非語言行為設計提供了基於理論和實驗的方法論，有助於更好地理解人-人交互和人-機器人交互中的注視行為和手勢行為。本論文的研究成果對多種涉及交互式機器人的實際應用場合具有寶貴的指導價值。
Zheng, Minhua.
Thesis Ph.D. Chinese University of Hong Kong 2015.
Includes bibliographical references (leaves 139-159).
Abstracts also in Chinese.
Title from PDF title page (viewed on 07, October, 2016).
Detailed summary in vernacular field only.
Detailed summary in vernacular field only.
Detailed summary in vernacular field only.
Detailed summary in vernacular field only.
40
"Proactive serving decreases user delay exponentially." 2014. http://repository.lib.cuhk.edu.hk/en/item/cuhk-1290668.
Full textAbstract:
In online service systems, delay experienced by a user from the service request to the service completion is one of the most critical performance metrics. To improve user delay experience, in this thesis, we investigate a novel aspect of system design: proactive serving, where the system can predict future user request arrivals and allocate its capacity to serve these upcoming requests proactively. This approach is complementary to the conventional capacity boosting mechanism and is motivated by recent industrial and academic advances. In particular, we investigate the fundamentals of proactive serving from a queuing theory perspective.First, most importantly, we show that under proactive serving the average user delay decreases exponentially (in the prediction window size) for a wide range of queuing models. Furthermore, the delay reduction is robust against prediction errors. We also show that both the variance of user delay and the tail of user delay decrease exponentially under proactive serving, which are also important user delay experience metrics.
We then show that proactive serving is more effective in decreasing user delay than capacity boosting in light workload regime. In particular, the average user delay decays inverse-proportionally in system capacity, but exponentially in the prediction window size in proactive serving.
Finally we demonstrate how to leverage proactive serving in system design from a optimization point of view, e.g., how many resources are dedicated to proactive serving. The results provide useful engineering insights to system designers.
Our trace-driven simulation results demonstrate the practical power of proactive serving: for example, under the YouTube data trace of 1000 different videos, the average user delay can be decreased by 50% when the system predicts 100 seconds ahead. Our results provide useful insights for proactive serving and justify its increasing applications in practical systems.
對於在線服務系統，由於系統服務造成的用戶延遲是衡量系統性能的重要指標。提高用戶的延遲體驗的傳統方法是提高系統中服務器的性能。在本論文中，我們研究一種新穎的叫做“前瞻性服務”的方法用來提高用戶的延遲體驗。前瞻性服務是指系統在預測用戶需求的基礎上，在用戶產生需求之前，系統已經將服務送到用戶手中。前瞻性服務是傳統方法的有力補充。我們從排隊論的角度研究前瞻性服務對用戶的延遲的提高。
首先，對於多种排隊系統，我們證明前瞻性服務能夠指數性降低用戶的平均延遲。而且前瞻性服務對於用戶需求預測的誤差具有魯棒性。我們同時也證明了前瞻性服務能夠指數性降低用戶的延遲方差和尾概率。
然後，我們證明前瞻性服務在系统低负载时比傳統方法在降低用戶的平均延遲上更加有效。前瞻性服務能夠指數性降低用戶的平均延遲。而通過提高系統服務器性能，只能反比例降低用戶的平均延遲。
最後，我們從優化的角度分析怎樣在系統設計中利用前瞻性服務，給系統設計者提供有用的建議。
我們基於實際數據的仿真結果驗證了前瞻性服務在實際系統的作用。例如，基於Youtube數據的仿真表明，如果系統能提前一百秒預測用戶的需求，那麼前瞻性服務能夠降低一半的用戶延遲。
Zhang, Shaoquan.
Thesis (Ph.D.)--Chinese University of Hong Kong, 2014.
Includes bibliographical references (leaves 103-108).
Abstracts also in Chinese.
Title from PDF title page (viewed on 02, December, 2016).
Detailed summary in vernacular field only.
Detailed summary in vernacular field only.
Detailed summary in vernacular field only.
Detailed summary in vernacular field only.
Detailed summary in vernacular field only.
41
Komňacká, Lucie. "Komparace českých televizních zpravodajských stanic ČT 24 a Z1." Master's thesis, 2010. http://www.nusl.cz/ntk/nusl-282001.
Full textAbstract:
Diploma thesis "Comparison of Czech Television news channels ČT24 and Z1" deals with collation of two channels aimed at continuous news broadcasting: public service ČT24 and private Z1. The thesis explores in what ways is signified dissimilar targeting at different goal groups of viewers. Analysed is not only the whole broadcasting scheme of both channels, but mainly the content of primetime news broadcasts, particularly in two specific periods: firstly at the beginnings of telecasting of the surveyed channels and secondly after one year of broadcasting in September 2009. The thesis attempts to determine the congruent features as well as the differences of the channels, using quantitative analysis it depicts the pattern of primetime news broadcasts with regard to formal and thematic aspect. In detail the thesis focuses on economical, foreign and regional broadcast and for instance the exploitation of live broadcasting. Since the analysis was accomplished in two different time periods the thesis also deals with changes in programme schemes and primetime news that were taken in action within the surveyed period. The theoretical part of the thesis generally focuses on the role, development and contribution of the news channels in the society. Consequently it describes two possible viewpoints of motivation to...
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López, Zadicoff Pablo D. "Polarización en el consumo de (ciertos) bienes de lujo." Tesis, 2009. http://hdl.handle.net/10915/3315.
Full textAbstract:
El trabajo explora la posibilidad teórica de que la demanda de ciertos bienes presente una curva de Engel en forma de S. Se desarrolla un modelo donde la utilidad depende de dos funcionalidades, así como del nivel de estatus. Se plantea que existen tres bienes, uno de los cuales posee aplicación dual en términos de estatus y funcionalidad. Asimismo los agentes poseen un consumo autónomo de estatus el cuál es función de su dotación de riqueza. Bajo el modelo planteado, se exploran las condiciones que esta función de transformación riqueza-estatus debe satisfacer para originar demandas con comportamiento no monótono ante variaciones de ingreso. Asimismo se postula a dos grupos de bienes (teléfonos celulares y calzado deportivo) como candidatos a exhibir el comportamiento analizado, y se contrasta la hipótesis con datos de consumo para Argentina.
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Hsiao, Chi-Yuan, and 蕭智元. "Electrical Properties and Microstructure of Rare Earth-doped Z5 U -BME Capacitors." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/71488247426402784642.
Full textAbstract:
碩士國立交通大學
電子研究所
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The Z5U Ni electrode ceramic capacitors with the main composition of (Ba,Ca)(Ti,Zr)O3 system were studied. Since the capacitor with Ni electrode should be fired in a reducing atmosphere to prevent the oxidation of Ni, thay have a problem in that the electrical properties is far worse than that of the capacitors with Pd electrode due to the formation of oxygen vacancies in the ceramic bodies of capacitors. The influence of rare-earth additives, such as Dy and Ho on the electrical properties and microstructure of (Ba,Ca)(Ti,Zr)O3 composition capacitor was investigated. Addition of Dy2O3 has little effect in the shift of Curie point and the increasing of k value,but the effect of grain growth inhibition was not found. The Curie peak of the samples co-fired with Ni electrode is more depressed than the samples without co-fired with Ni which are painted with In-Ga alloy. We assume this difference was probably caused by diffusion of Ni into the dielectrics during co-firing with Ni electrode. On the other hand, Curie point of the samples painted with Cu electrode is different than the samples co-fired with Ni electrode or painted with In-Ga alloy.
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Petrides, Loizos. "Developing and managing the artist´s career: the visual artist as entrepreneur." Doctoral thesis, 2017. http://hdl.handle.net/10071/17069.
Full textAbstract:
Este estudo investiga o impacto de processos do mercado (galerias, feiras, e leilões de arte) e
decisões curatoriais nas carreiras de artistas visuais. O estudo contribui para a literatura sobre o
empreendedorismo artístico, introduzindo o conceito de "business level entrepreneurship" e as
qualidades de proatividade, capacidade de gestão, e networking relacionadas com este conceito. O
contexto do estudo é o mundo artístico de Lisboa e a sua análise melhora a compreensão das
complexidades inerentes e as interações de artistas com outros agentes e processos no mundo de
arte. Esta análise contribui para a literatura adicionando ao paradigma global conhecimentos
obtidos através deste contexto artístico. Na revisão da literatura, uma abordagem multidisciplinar
é utilizada para analisar a complexidade do funcionamento do mercado de arte ocidental. Na parte
empírica, foram realizadas 28 entrevistas semiestruturadas com agentes do mundo artístico (14
artistas, 7 agentes do mercado e 7 institucionais) que foram analisadas seguindo as diretrizes da
análise temática. A visibilidade do trabalho do artista é o tema principal deste estudo, e os meios
para alcançá-la são a afiliação galerística do artista e a presença do seu trabalho em feiras e
instituições. Este estudo demonstra que o artista que possui qualidades empresariais pode
desenvolver uma carreira com mais visibilidade, reconhecimento, e sucesso no mercado. O estudo
tem implicações para a carreira artística e a sua internacionalização, e oferece recomendações de
pesquisa relacionadas com o conceito de "business level entrepreneurship".This study researches the impact of market-based processes (galleries, art fairs, auctions), and curatorial-led decisions on the career development of visual artists, including its internationalization. The study contributes to the arts entrepreneurship literature by introducing the concept of "business level entrepreneurship" and the qualities of proactiveness, managerial capability, and networking associated with it. The context of the study is the Lisbon art world and its examination enhances the understanding of the intricacies of the art world and the interactions of artists with other art world agents and processes. It also expands the relevant literature aiming to enrich the global paradigm by adding insight obtained from this art world. For the literature review, a multi-disciplinary approach is used to reveal the complexity of the workings of the western art market. For the research, 28 semi-structured interviews with art world agents (14 artists and 14 market/institutional agents) were conducted and analyzed using thematic analysis. Visibility for the artist’s work is the main theme, and the artist’s gallery affiliation, art fair participation, and institutional presence, are means to achieve it. This research demonstrates that the artist possessing entrepreneurial qualities at the business level can develop a career with more visibility, recognition, and market success. The study has implications for artists and their careers, provides recommendations for state policies for visual arts, and suggests research topics for further developing the concept of "business level entrepreneurship".
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LIN, JING-XI, and 林景熙. "CaO-ZrO2 -TiO2 三元氧化物Ca2 Zr5 Ti2 O16 CaZrTi2 O7 的玻璃陶瓷及結晶釉的開發與研究." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/61466793183240362118.
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馬麗英. "小樣本二維配對二項參數差之標準化Z1檢定." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/51966168080215992208.
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Jaume, David. "Evolución de la segregación escolar en Argentina." Tesis, 2011. http://hdl.handle.net/10915/18221.
Full textAbstract:
El trabajo lleva a cabo un análisis empírico exhaustivo del nivel y evolución de la segregación escolar en Argentina desde el año 1992 al año 2010, centrándose particularmente en los alumnos pertenecientes a familias del 20% más pobre de la población. Con ese fin se proponen dos nuevas metodologías al estudio de la segregación: las curvas de segregación percentílicas y la utilización de micro descomposiciones. Los resultados obtenidos son alarmantes: la segregación se incrementó entre 30% y 100% dependiendo del índice y el nivel educativo analizado. Este aumento guarda una estrecha relación con los cambios en las características de las familias en el nivel primario, no así en el nivel secundario.
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Ribeiro, Mariana Sofia Góis. "Determinantes de elisão fiscal das empresas localizadas em países pertencentes à OCDE: A influência do National Culture Model de Hofstede." Master's thesis, 2018. http://hdl.handle.net/10071/18752.
Full textAbstract:
Este estudo pretende explorar o impacto que as diferenças culturais poderão ter na prática de atividades de elisão fiscal, existindo alguns estudos já publicados que estudaram a relação entre as diferenças culturais e espetros mais agressivos do planeamento fiscal.
O objetivo do estudo é identificar o grupo de variáveis que possui maior impacto quando se determina o nível de elisão fiscal das empresas, localizadas em países pertencentes à Organização para a Cooperação e Desenvolvimento Económico (OCDE), procedendo ainda à introdução de variáveis que caracterizem as diferenças culturais dos países, verificando se diferentes países, e consequentemente diferentes culturas, influenciam o nível de tax avoidance.
Existem características que tornam este estudo diferenciador:
• A relação que procura estabelecer entre o Modelo de Cultura Nacional de Hofstede e a elisão fiscal;
• A introdução de duas dimensões do Modelo que não foram incluídas em nenhum dos estudos que suportam este trabalho.
Através dos resultados é possível traçar um perfil das empresas tax avoiders que são as empresas que têm menor dimensão, menor rentabilidade, não auditadas por Big4 e com taxas de imposto nominal inferiores, porém com um nível de alavancagem superior e maior investimento em investigação e desenvolvimento.
Os resultados que foram obtidos com a inclusão do Modelo de Cultura Nacional de Hofstede permitem afirmar que valores reduzidos nas dimensões Power Distance Index, Masculinity, Uncertainty Avoidance Index e Long-Term Orientation, bem como valores elevados nas dimensões Individualism e Indulgence versus Restraint estão associados a sociedades cujas empresas pretendem diminuir a sua carga tributária.The main objective of this study is to explore the impact of international cultural differences on the use of mechanisms related with tax avoidance. There are some studies that try to explore the relationship between cultural differences and aggressive mechanisms of tax planning. The goal of this study is to identify the group of variables that have more importance when it is determined the tax avoidance level of companies located in countries belonging to the Organisation for Economic Co-operation and Development (OECD), and with the introduction of dimensions that recognise the cultural differences, explore if different countries, and so different cultures, have impact on the tax avoidance level. This study has some characteristics which are innovative: • Explores the relationship between National Culture Model, from Hofstede, and tax avoidance; • The introduction of two dimensions of the Model that weren’t included in any of the studies that support this work. From the results it is possible to profile companies that are tax avoiders, which are the smaller, least profitable, non-audited by big4 and with lower statutory tax rates, and at the same time have higher indebtedness level and higher investment in research and development. The results that were derived with the inclusion of the National Culture Model, from Hofstede, allowed to conclude that lower levels in the dimensions of Power Distance Index, Masculinity, Uncertainty Avoidance Index and Long-Term Orientation, as well as higher levels on Individualism and Indulgence versus Restraint are associated with countries which companies wish to reduce its tax burden.
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Listopad, Francisca Simões Synek. "Innovation in museums: an analysis to the Portuguese museums." Master's thesis, 2019. http://hdl.handle.net/10071/19834.
Full textAbstract:
Since the first decade of the 21st century, European countries have stopped being primarily concerned with securing funding for museums. In addition, we are currently living in a “fast-paced world” where people are looking for virtual and immediate experiences. Such paradigm contributes to making it increasingly difficult to bring public to museums. How can museums survive in the present context? Any Western society recognizes the importance of culture, however, the policies implemented by the states, mainly by the Portuguese, do not translate this idea.
This dissertation intends to analyze a group that contributes to the Portuguese culture, in this case, the museums. In addition to the latter, this research aims to focus on the themes of innovation (within the museological scope) and the economic sustainability of the above-mentioned institutions. In terms of analysis, the research in question is devoted to the study of innovative practices and conceptions that are present in four case studies. The museums elected are the Communications Museum, the Ílhavo Maritime Museum, the National Press Museum and the Portimão Museum.
This project will conclude that a Museum innovates and its innovative policies contribute to its economic sustainability. This dissertation has the ambition of stimulating a reflection on these themes within the national community, which may arouse the interest of both non-governmental organizations and governmental agents.Desde a primeira década do século XXI que os países europeus não se encontram preocupados em garantir o financiamento de museus. Adicionalmente, vivemos num “mundo acelerado” em que as pessoas procuram experiências virtuais e imediatas. Tal paradigma contribui para que seja cada vez mais difícil levar o público a museus. Como é que os museus conseguem sobreviver no contexto presente? Qualquer sociedade ocidental reconhece a importância da cultura, no entanto, as políticas implementadas pelos Estados, principalmente pelo português, não traduzem essa ideia. Esta dissertação pretende analisar um núcleo que contribui para a cultura em Portugal, neste caso, os museus. Para além dos últimos, o trabalho em questão pretende focar-se nas temáticas da inovação (em sede do âmbito museológico) e da sustentabilidade económica das instituições acima referidas. Em termos de análise, a investigação em causa é dedicada ao estudo das práticas e conceções inovadoras que se encontram presentes em quatro casos de estudo. Os quatro museus eleitos são o Museu das Comunicações, o Museu Marítimo de Ílhavo, o Museu Nacional da Imprensa e o Museu de Portimão. Conduzir este projeto e verificar que o Museu inova e que essa contribui para a sustentabilidade económica é também uma forma de impulsionar uma reflexão a propósito destes temas no seio da comunidade nacional, o que poderá despertar o interesse tanto de organizações não-governamentais como de agentes governamentais.
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Simon, Koci. "Cross-cultural competency model for digital nomads: a study of digital nomads living in Czech Republic." Master's thesis, 2017. http://hdl.handle.net/10071/17381.
Full textAbstract:
The goal of this master thesis is to develop a competency model for Digital Nomads and
evaluate its components in Czech culture.
The research is based on primary and secondary data. Secondary data was collected
from relevant literature. The primary data was collected via interview and questionnaire. The
quantitative method was used to evaluate the components of the cross-cultural competency
model by Johnson, Lenartowicz and Apud (2006). The qualitative research aims to compare
the reality of the Digital Nomad experience with the current cross-cultural competency model
and to further explore competencies.
The research has 4 parts: data collection via interviews and a questionnaire with a
sample group of 7 digital nomads from different countries, analysis of data collected during the
interviews and questionnaire, evaluation of cross-cultural competencies, identification of crosscultural competencies and the development a of cross-cultural competence model.
The dimensions, categories and particular elements of cross-cultural competency
model are following: knowledge about informational technology, business and local
infrastructure, culture, law and language, skills such as self-management or ability to socialize
and aptitudes, personal traits and external factorsO objetivo desta tese de mestrado é desenvolver um modelo de competências para digital nomads e avaliar os seus componentes na cultura Checa. A pesquisa é baseada em informação primária e secundária. Informação secundária é recolhida da literatura. A informação primária é recolhida via entrevista e questionários. O método quantitativo tenta avaliar os componentes de competências multiculturais do modelo de Johnson, Lenartowicz e Apud (2006). A pesquisa quantitativa procura comparar a realidade com o modelo de competências multicultural e explorar competências. A pesquisa tem 4 partes: recolha de dados via entrevistas e questionários com um grupo amostral de 7 nomadas digitais de diferentes países, análise de dados recolhidos durante as entrevistas e questionários, avaliação multicultural das competências, identificação multicultural das competências e eventualmente o desenvolvimento multicultural do modelo das competências. As dimensões, categorias e elementos específicos de competências multiculturais são as seguintes: conhecimento sobre tecnologia informacional, negócios e infraestruturas locais, culturas, leis e linguagens,habilidades como auto-gerência ou habilidade de socializar e aptitudes, traços pessoais e factores externos.