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Zhang, Hao. "PhD thesis on liquidity of bond market." Thesis, City University London, 2013. http://openaccess.city.ac.uk/2983/.
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This thesis consists of empirical and theoretical studies on the liquidity of bond markets. In the first study, we present an extended model for the estimation of the effective bid-ask spread that improves the existing models and offers a new direction of generalisation. The quoted bid-ask spread represents the prices available at a given time for transactions only up to some relatively small trade size. Trades can be executed inside or outside the quoted bid-ask spread. Thus, we extend Roll's model to include multiple spreads of different sizes and their associated probabilities. The extended model is estimated via a Bayesian approach, and the fit of the model to a time series of a year of corporate bond transaction data is assessed by a Bayesian model selection method. Results show that our extended model fits the data better. Our second study examines the relationships between different liquidity proxies and the non-default corporate yield spread as well as the effective bid-ask spread. We first separate the non-default component of bond spreads from the default one by using the information contained in credit default swaps. We then apply our state-space extension of the Roll model to disentangle the unobservable non-default yield spread from the effective bid-ask spread. The empirical results show that the non-default yield spread has a nonlinear relationship with time to maturity and a positive correlation with the bid-ask spread as well as with the default risk, and therefore may reflect the future expected liquidity. We find that the effective bid-ask spread is related to bond characteristics associated with illiquidity (e.g. timeto-maturity and issue amount) and trading activity measures (e.g. daily turnover, and daily average trade size), indicating that transactions costs are more likely to be associated with the current level of liquidity rather than the future expected liquidity. We also find that the non-default component accounted for a bigger proportion of the yield spread before the financial crisis 2007 - 2009, whereas during the crisis credit risk played a more influential role in determining the yield spread. Common factors such as the underlying volatility and CDS spread explain more of the variation in the non-default yield spread and the bid-ask spread than idiosyncratic factors such as timeto-maturity, issue size, and trading activity proxies do. The third study presents an equilibrium model in which the heterogeneity of liquidity among bonds is determined endogenously. In particular we show that bonds differ in their liquidity despite having identical cash flow, riskiness and issue amount. Under certain conditions, we show that investors have strong preference for concentrating trading on a small number of bonds. We conjecture that the identity of the ones which are traded may result from a `Sunspot' equilibrium where it is optimal for traders to randomly label a subset of the bonds as the `liquid' ones and concentrating trading on them. We also show that changing the model assumptions leads to different equilibrium configurations where trading is spread over the bonds. In addition, by utilising the concepts of stochastic dominance, utility indifference pricing, and some specific assumptions on asset value and order arrival rate, the equilibrium prices and bid-ask spreads can be quantified.
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Dunkels, Adam. "Programming Memory-Constrained Networked Embedded Systems. PhD thesis." Doctoral thesis, Västerås : Department of Computer Science and Electronics, Mälardalen University, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-173.
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Pocknee, David Antony. "How to compose a PhD thesis in music composition." Thesis, University of Huddersfield, 2017. http://eprints.hud.ac.uk/id/eprint/34371/.
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I start from the principle that composition is a historical lineage of techniques that have traditionally been applied to music but need not be. To illustrate this, I apply composition principles to the writing of this PhD thesis. In describing this process, I draw parallels between the music work I have composed during 2013-2017 and the process of thesis writing. Along the way, I show how quantization is not only central to my composition practice but fundamental to the act of composing; I rethink the basic epistemological principles of PhD research, using John Cage's ideology of chance and Arthur Koestler's idea of bisociation; I develop a new set of categories for classifying artworks that use combinatorics, under the umbrella neologism 'completism'; expand upon James Tenney's ideas to create a new typology of musical form based on completist principles; and finish by composing the bibliography, font, page-layout, semantics, word choice, and syntax of the Conclusion of this thesis.
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Sporre, Cecilia, and Inger M. Jonsson. "The Conscious Meal “– ideas for studies in a PhD-thesis." Örebro universitet, Restaurang- och hotellhögskolan, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-25617.
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Posterpresentation: IFHE World Congress 2012 , 16-21 juli Melbourne Australia International Federation for Home Economics Global Wellbeing Global creativity and innovation: Developing capacities for sustainable futures Abstract “The Conscious Meal “– ideas for studies in a PhD-thesis PhD Student Cecilia M Sporre, Associate Professor Inger M Jonsson, The School of Hospitality, Culinary arts & Meal Science, Örebro University, Sweden Aim The aim is to discuss ideas for a newly started PhD thesis. The focus is on a rather tacit concept -“The Conscious Meal”- that was the description of a meal consisting of taste, nutrition and aesthetic expressions in the 1980´s. This holds for the curriculum of Culinary Arts and Meal Science in Sweden. Is it possible to deepen, develop and consolidate this concept and use it in information about food and meals? Methods At The School of Hospitality, Culinary Arts & Meal Science in Örebro University, Sweden, the basis of the education is Science, Practical skills and Aesthetics. These three forms of knowledge is the fundamental platform for the subject. The unique method used in education and research is named FAMM (Five Aspects Meal Model, i.e. the room, meeting, product, control management system giving the atmosphere). The method can be used as a planning and analysis tool for public and private meals. Another useful method is the original and the applied versions of the French Sapere method; an experimental method using raw materials from the food sector, studying and working with the individual components and sensory experiences in the meal. Possible methods to discuss the concept with key groups will be interviews, research circles, focus groups, observations, and maybe analysis on grounded theory etc. Results/findings To be discussed; Ideas of studies Study I: Daily meals for people with intellectual disability in community living – results forthcoming Study II: Culinary Success Factors – results forthcoming Study III: The meal as a pedagogical tool Study IV: Children’s meals Conclusions New skills and influences affect our approach to the meal of today. Developing the concept of “The Conscious Meal” could give tools for education and eating guidelines in a holistic way. This may raise the awareness both in public and private meals.<br>Ideas for studies in a PhD-thesis
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Skubała, Anna. "Evolution of compost stability tu real time : PhD thesis summary." Rozprawa doktorska, [s.n.], 2018. http://dlibra.tu.koszalin.pl/Content/1093.
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Kobaka, Janusz. "Mineral composite model with randomly distributed fibres : PhD thesis summary." Rozprawa doktorska, [s.n.], 2014. http://dlibra.tu.koszalin.pl/Content/1067.
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Kraśniewski, Jarosław. "Measurements of transient thermal characteristics of microwave transistors : PhD thesis summary." Rozprawa doktorska, [s.n.], 2009. http://dlibra.tu.koszalin.pl/Content/1196.
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Król, Maciej R. "Studies of concrete properties based on geopolymer binders : PhD thesis summary." Rozprawa doktorska, [s.n.], 2017. http://dlibra.tu.koszalin.pl/Content/1039.
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Kruzel, Marcin. "Modeling of refrigerants condensation in vertical pipe minichannel : PhD thesis summary : [synopsis]." Rozprawa doktorska, [s.n.], 2018. http://dlibra.tu.koszalin.pl/Content/1038.
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Urbanowicz, Mirosław. "Influence parameters of ignition arrangement on profile of engine : PhD thesis summary." Rozprawa doktorska, [s.n.], 2015. http://dlibra.tu.koszalin.pl/Content/1057.
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Rypina, Łukasz. "Analysis end modeling of microcutting titanium alloys processes : PhD thesis summary : [synopsis]." Rozprawa doktorska, [s.n.], 2016. http://dlibra.tu.koszalin.pl/Content/1051.
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Wojszczyk, Rafał. "Model of quality assessment of implementation of design patterns : PhD thesis summary." Rozprawa doktorska, [s.n.], 2018. http://dlibra.tu.koszalin.pl/Content/1073.
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Nair, Nisha. "Geophysical characterization of tectonic elements along the western continental margin of India and the Andaman-Sumatra Arc- Trench system." Thesis, IIG, 2010. http://localhost:8080/xmlui/handle/123456789/1583.
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Jayashree, B. "Studies of temporal and spatial structures of ultra-low-frequency (ULF) waves in earths magnetosphere." Thesis, IIG, 2010. http://localhost:8080/xmlui/handle/123456789/1581.
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Basavaiah, Nathani. "Study of earth's interior through geomagnetic methods-satellite derived geopotential field anomalies." Thesis, IIG, 1993. http://localhost:8080/xmlui/handle/123456789/1565.
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Peinl, Hannes [Verfasser]. "Essays on mitigation options: Forestry, CCS and Renewable Energy : PhD Thesis / Hannes Peinl." Berlin : epubli GmbH, 2015. http://d-nb.info/1072596180/34.
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RODRIGUES, VIVIANE MERLINO. "TRANSVERSAL PATHS: DÉCIO PIGNATARI S PHD THESIS AND LYGIA PAPE S MASTERS DISSERTATION." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2017. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=33752@1.
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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO<br>COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>PROGRAMA DE SUPORTE À PÓS-GRADUAÇÃO DE INSTS. DE ENSINO<br>Com a análise das produções e das trajetórias acadêmicas de dois expoentes da Vanguarda Construtiva Brasileira – Décio Pignatari e Lygia Pape – o presente trabalho discute a relação entre arte e indústria a partir dos anos 1950. Ambos trabalharam como artistas, designers e professores universitários. Acreditavam que o artista moderno devia integrar-se à coletividade de diversos modos, incluindo a participação nos meios de produção e nas mídias de massa. Como docentes, iniciaram suas carreiras ministrando semiótica. Posteriormente, Pignatari caminhou para as teorias da literatura e da comunicação enquanto Pape se dedicou ao ensino de linguagem visual. Tanto um quanto o outro lecionaram em cursos de graduação e pós-graduação. Seus textos acadêmicos, embora pouco examinados em profundidade como parte do Projeto Construtivo, trazem importantes reflexões acerca da crise da arte na era da reprodutibilidade técnica, propondo saídas para este impasse. Por esta razão, são analisados os ideais expostos na tese de doutorado Semiótica e Literatura (USP-1973), de Décio Pignatari, e na dissertação de mestrado Catiti-Catiti, na terra dos brasis (UFRJ-1980), de Lygia Pape. Busca-se compreender seus posicionamentos perante o questionamento do belo como categoria central da estética, observando os reflexos da Semiótica de. C. S. Peirce nos temas abordados por Pignatari e as marcas da Fenomenologia de M. Merleau-Ponty no pensamento de Pape. Investigam-se, então, suas posturas em defesa da invenção artística, considerando as duas diferentes perspectivas sobre este conceito. Livros de W. Benjamin, M. Bense e M. Pedrosa estão entre referenciais teóricos centrais das duas pesquisas.<br>This research verifies the connections between constructive arts and industries after the 1950 s. Particularly, the work aims to inquire the productions and the academic trajectories of two important members of the Brazilian Constructive Vanguard – Décio Pignatari and Lygia Pape. Both of them were artists, designers and professors. In their view, the modern artist should contribute to industrial society in many different ways, because all creative activities were related. As college members, they began teaching semiotics. Lately, Pignatari dedicated his career to literature and communication theories and Pape became interested in visual linguistics education. It is worthwhile to mention that they were educators in graduation and post-graduation courses. Their academic papers discuss the art crisis in the age of mechanical reproduction, proposing ways to overcome this challenge. However, these texts were rarely mentioned as a part of Brazilian Constructive Project. Therefore, this investigation analyses Décio Pignatari s PHD Thesis called Semiótica e Literatura (USP-1973), and Lygia Pape s Masters Dissertation untitled Catiti-Catiti, na terra dos brasis (UFRJ-1980). Initially, their arguments lead to the questioning of the beauty concept as a central aesthetic category. In this sense, C. S. Peirce s semiotics impacts Pignatari s thoughts, and M. Merleau-Ponty s phenomenology marcs Pape s ideals. Lately, this work examines their claims for artistic invention, revealing two different perspectives on this concept. Books written by W. Benjamin, M.Bense and M. Pedrosa integrate their theoretical frameworks.
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Patyk, Sylwia. "Forces analysis rolling burnishing rough surfaces with triangular outlines asperity : PhD thesis summary." Rozprawa doktorska, [s.n.], 2015. http://dlibra.tu.koszalin.pl/Content/1059.
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Wysocki, Włodzimierz. "Agent-objekt model of support for the software dewelopment process : PhD thesis summary." Rozprawa doktorska, [s.n.], 2018. http://dlibra.tu.koszalin.pl/Content/1048.
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Pikuła, Katarzyna. "Restoration of Parnowskie Lake using the pulverizing aeration technique : PhD thesis summary : [synopsis]." Rozprawa doktorska, [s.n.], 2016. http://dlibra.tu.koszalin.pl/Content/1052.
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Ziebell, Robert-Christian. "Digital transformation of HR - History, implementation approach and success factors - Cumulative PhD Thesis." Doctoral thesis, Universitat Politècnica de València, 2019. http://hdl.handle.net/10251/117608.
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[ES] La digitalización de los procesos de RRHH en soluciones basadas en la nube progresa continuamente. Esta tesis examina tales transformaciones, deriva un modelo de proceso concreto e identifica los factores críticos de éxito.
La metodología utilizada para la investigación es de carácter cualitativo. Como base y medida preparatoria para abordar las cuestiones de investigación, se llevó a cabo un amplio estudio bibliográfico en el ámbito de los recursos humanos, con especial atención a las publicaciones sobre la gestión electrónica de los recursos humanos (en adelante, "e-HRM"). Basándose en este conocimiento y en la combinación de una amplia experiencia práctica con proyectos de transformación de RRHH, se publicó un estudio que presenta el desarrollo histórico de e-HRM y que ha derivado en un modelo de procesos optimizado que tiene en cuenta los requisitos técnicos de RRHH así como las limitaciones de la nueva tecnología de la nube. Posteriormente, se entrevistó a varios expertos en RRHH que ya habían adquirido experiencia de primera mano con los procesos de RRHH en un entorno de nube para averiguar qué factores de éxito eran relevantes para dicha transformación de RRHH.
Las principales conclusiones de esta tesis son la derivación de un modelo de procedimiento de proyecto de mejores prácticas para la transformación de los procesos de RRHH en una solución basada en la nube y la identificación de obstáculos potenciales en la implementación de dichos proyectos. Además, se elaboran los motivos de dicha transformación, los factores que impulsan el proceso dentro de una organización, el grado actual de digitalización de los recursos humanos, los parámetros operativos y estratégicos necesarios y, en última instancia, el impacto en los métodos de trabajo. Como resultado, se realiza una evaluación del uso de las métricas de HR y se derivan nuevas ratios potenciales.<br>[CAT] La digitalització dels processos de RRHH en solucions basades en el núvol progressa contínuament. Aquesta tesi examina tals transformacions, deriva un model de procés concret i identifica els factors crítics d'èxit.
La metodologia utilitzada per a la investigació és de caràcter qualitatiu. Com a base i mesura preparatòria per a abordar les qüestions d'investigació, es va dur a terme un ampli estudi bibliogràfic en l'àmbit dels recursos humans, amb especial atenció a les publicacions sobre la gestió electrònica dels recursos humans (en endavant, "e-HRM "). Basant-se en aquest coneixement i en la combinació d'una àmplia experiència pràctica amb projectes de transformació de RRHH, es va publicar un estudi que presenta el desenvolupament històric d'e-HRM i que ha derivat en un model de processos optimitzat que té en compte els requisits tècnics de RRHH així com les limitacions de la nova tecnologia del núvol. Posteriorment, es va entrevistar a diversos experts en RRHH que ja havien adquirit experiència de primera mà amb els processos de RRHH en un entorn de núvol per esbrinar quins factors d'èxit eren rellevants per a aquesta transformació de RRHH.
Les principals conclusions d'aquesta tesi són la derivació d'un model de procediment de projecte de millors pràctiques per a la transformació dels processos de RRHH en una solució basada en el núvol i la identificació d'obstacles potencials en la implementació d'aquests projectes. A més, s'elaboren els motius de la transformació, els factors que impulsen el procés dins d'una organització, el grau actual de digitalització dels recursos humans, els paràmetres operatius i estratègics necessaris i, en última instància, l'impacte en els mètodes de treball . Com a resultat, es realitza una avaluació de l'ús de les mètriques de HR i es deriven nous ràtios potencials.<br>[EN] The digitisation of HR processes into cloud-based solutions is progressing continuously. This thesis examines such transformations, derives a concrete process model and identifies the critical success factors.
The methodology used for the investigation is of a qualitative nature. As a basis and preparatory measure to address the research questions, an extensive literature study in the HR field was carried out, with a special focus on publications on electronic human resources management (hereinafter e-HRM). Based on this knowledge and the combination of extensive practical experience with HR transformation projects, a study was published which presents the historical development of e-HRM and derived an optimised process model taking into account the technical HR requirements as well as the limitations of the new cloud technology. Subsequently, several HR experts who had already gained first-hand experience with HR processes in a cloud environment were interviewed to find out which success factors were relevant for such an HR transformation.
Main findings of this thesis are the derivation of a best-practice project procedure model for the transformation of HR processes into a cloud-based solution and the identification of potential obstacles in the implementation of such projects. In addition, the motives for such a transformation, the drivers within an organisation, the current degree of HR digitisation, the necessary operational and strategic parameters and ultimately the impact on working methods are worked out. As a further result, an assessment of the use of HR metrics is given and potential new key figures are derived.<br>Ziebell, R. (2019). Digital transformation of HR - History, implementation approach and success factors - Cumulative PhD Thesis [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/117608<br>TESIS
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Tjondronegoro, Dian W. "PhD Thesis: "Content-based Video Indexing for Sports Applications using Multi-modal approach"." Thesis, Deakin University, 2005. https://eprints.qut.edu.au/2199/1/PhDThesis_Tjondronegoro.pdf.
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Triggered by technology innovations, there has been a huge increase in the utilization of video, as one of the most preferred types of media due to its content richness, for many significant applications. To sustain an ongoing rapid growth of video information, there is an emerging demand for a sophisticated content-based video indexing system. However, current video indexing solutions are still immature and lack of any standard. One solution, namely annotation-based indexing, allows video retrieval using textual annotations. However, the major limitations are the restrictions of pre-defined keywords that can be used and the expensive manual work on annotating video. Another solution called feature-based indexing allows video search by low-level features comparison such as query by a sample image. Even though this approach can use automatically extracted features, users would not be able to retrieve video intuitively, based on high-level concepts. This predicament is caused by the so-called semantic gap which highlights the fact that users recall video contents in a high-level abstraction while video is generally stored as an arbitrary sequence of audio-visual tracks.
To bridge the semantic gap, this thesis will demonstrate the use of domain-specific approach which aims to utilize domain knowledge in facilitating the extraction of high-level concepts directly from the audiovisual features. The main idea behind domain-specific approach is the use of domain knowledge to guide the integration of features from multi-modal tracks. For example, to extract goal segments from soccer and basketball video, slow motion replay scenes (visual) and excitement (audio) should be detected as they are played during most goal segments. Domain-specific indexing also exploits specific browsing and querying methods which are driven by specific users/applications’ requirements. Sports video is selected as the primary domain due to its content richness and popularity. Moreover, broadcasted sports videos generally span for hours with many redundant activities and the key segments could make up only 30% to 60% of the entire data depending on the progress of the match.
This thesis presents a research work based on an integrated multi-modal approach for sports video indexing and retrieval. By combining specific features extractable from multiple (audio-visual) modalities, generic structure and specific events can be detected and classified. During browsing and retrieval, users will benefit from the integration of high-level semantic and some descriptive mid-level features such as whistle and close-up view of player(s). The main objective is to contribute to the three major components of sports video indexing systems. The first component is a set of powerful techniques to extract audio-visual features and semantic contents automatically. The main purposes are to reduce manual annotations and to summarize the lengthy contents into a compact, meaningful and more enjoyable presentation. The second component is an expressive and flexible indexing technique that supports gradual index construction. Indexing scheme is essential to determine the methods by which users can access a video database. The third and last component is a query language that can generate dynamic video summaries for smart browsing and support user-oriented retrievals.
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Singh, Nicola. "On the 'thesis by performance' : a feminist research method for the practice-based PhD." Thesis, Northumbria University, 2016. http://nrl.northumbria.ac.uk/36132/.
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This doctoral project challenges the conventions of academic enquiry that, by default, still largely shape the procedures of practice-based PhDs. It has been submitted in the form of a ‘thesis by performance’ - a thesis that can only be realized through live readings that present knowledge production as something done in and around bodies and their contexts. The aim has been to reposition institutional and educational knowledge in an intimate, subjective relationship with the body, particularly the researchers own body. The ideas gathered together in this ‘thesis by performance’ address the body and its context using material that was sometimes appropriated, sometimes invented and sometimes autobiographically constructed. From the start, these approaches and sources were used to directly address those listening in the present, the ‘now’ in which words were spoken. An approach influenced by feminist thinkers in the arts, Kathy Acker, Chris Kraus, Katrina Palmer and Linda Stupart. The methodological development of the research has been entirely iterative – developed through the making and presenting of performance texts. Each text was presented live as part of mixed-media installations, experimenting with how language and voice can be visualised and choreographed. Consequently, the resulting ‘thesis by performance’ is a doctoral submission unimpeded by a printed script - only an introductory statement and two appendices are available outside of a live reading. In this way the process of performance can inspire new terms of reference in the field of postgraduate practice-led research entirely on its own terms.
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Laskowska-Bury, Joanna. "Selected physico-mechanical properties fiber reinforced composit produced on waste aggregate : PhD thesis summary." Rozprawa doktorska, [s.n.], 2017. http://dlibra.tu.koszalin.pl/Content/1040.
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Kasperowicz, Maciej. "The basics use of pressure water stream in fish processing : PhD thesis summary : [synopsis]." Rozprawa doktorska, [s.n.], 2016. http://dlibra.tu.koszalin.pl/Content/1055.
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Krystosik, Przemysław. "Static and stability problems of steel frames with semi-rigid joints : PhD thesis summary." Rozprawa doktorska, [s.n.], 2014. http://dlibra.tu.koszalin.pl/Content/1072.
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Michalkiewicz, Jarosław. "Algorithms and methods of training neurol network basedon modified Kolmogorov's theorem : PhD thesis summary." Rozprawa doktorska, [s.n.], 2014. http://dlibra.tu.koszalin.pl/Content/1070.
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Fijałkowska, Diana. "Energetic parameters variability of shrubby willow depending on its cultivation : PhD thesis summary : [synopsis]." Rozprawa doktorska, [s.n.], 2013. http://dlibra.tu.koszalin.pl/Content/1086.
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Altuna, Jon. "Cyclostationary blind equalisation in mobile communications." Thesis, University of Edinburgh, 1998. http://hdl.handle.net/1842/1375.
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Blind channel identification and equalisation are the processes by which a channel impulse response can be identified and proper equaliser filter coefficients can be obtained, without knowledge of the transmitted signal. Techniques that exploit cyclostationarity can reveal information about systems which are nonminimum phase; nonminimum phase channels cannot be identified using only second-order statistics (SOS), because these do not contain the necessary phase information. Cyclostationary blind equalisation methods exploit the fact that, sampling the received signal at a rate higher than the transmitted signal symbol rate, the received signal becomes cyclostationary. In general, cyclostationary blind equalisers can identify a channel with less data than higher-order statistics (HOS) methods, and unlike these, no constraint is imposed on the probability distribution function of the input signal. Nevertheless, cyclostationary methods suffer from some drawbacks, such as the fact that some channels are unidentifiable when they exhibit a number of zeros equally spaced around the unit circle. In this thesis the performance of a cyclostationary blind channel identification algorithm combined with a maximum-likelihood sequence estimation receiver is analysed. The simulations were conducted in the pan-European mobile communication system GSM environment and the performance of the blind technique was compared with conventional channel estimation methods using training. It is shown that although blind equalisation techniques can converge in a few hundred symbols in a time-invariant channel environment, the degradation with respect to methods with training is still considerable. Yet, the fact that a dedicated training sequence is not needed makes blind techniques attractive, because the data used for training purposes can be re-allocated as information data. In the concluding part of this thesis a new blind channel identification algorithm which combines methods that exploit cyclostationarity implicitly and explicitly is presented. It is shown that the properties of cyclostationary statistics are exploited in the new algorithm, and enhance the performance of the technique that solely exploits fractionally-spaced sampling. The algorithm is robust in the presence of correlated noise and interference from adjacent users.
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Rouse, Thomas S. "Multi-hop relaying networks in TDD-CDMA systems." Thesis, University of Edinburgh, 2004. http://hdl.handle.net/1842/1365.
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The communications phenomena at the end of the 20th century were the Internet and mobile telephony. Now, entering the new millennium, an effective combination of the two should become a similarly everyday experience. Current limitations include scarce, exorbitantly priced bandwidth and considerable power consumption at higher data rates. Relaying systems use several shorter communications links instead of the conventional point-to-point transmission. This can allow for a lower power requirement and, due to the shorter broadcast range, bandwidth re-use may be more efficiently exploited. Code division multiple access (CDMA) is emerging as one of the most common methods for multi user access. Combining CDMA with time division duplexing (TDD) provides a system that supports asymmetric communications and relaying cost-effectively. The capacity of CDMA may be reduced by interference from other users, hence it is important that the routing of relays is performed to minimise interference at receivers. This thesis analyses relaying within the context of TDD-CDMA systems. Such a system was included in the initial draft of the European 3G specifications as opportunity driven multiple access (ODMA). Results are presented which demonstrate that ODMA allows for a more flexible capacity coverage trade-off than non-relaying systems. An investigation into the interference characteristics of ODMA shows that most interference occurs close to the base station (BS). Hence it is possible that in-cell routing to avoid the BS may increase capacity. As a result, a novel hybrid network topology is presented. ODMA uses path loss as a metric for routing. This technique does not avoid interference, and hence ODMA shows no capacity increase with the hybrid network. Consequently, a novel interference based routing algorithm and admission control are developed. When at least half the network is engaged in in-cell transmission, the interference based system allows for a higher capacity than a conventional cellular system. In an attempt to reduce transmitted power, a novel congestion based routing algorithm is introduced. This system is shown to have lower power requirement than any other analysed system and, when more than 2 hops are allowed, the highest capacity. The allocation of time slots affects system performance through co-channel interference. To attempt to minimise this, a novel dynamic channel allocation (DCA) algorithm is developed based on the congestion routing algorithm. By combining the global minimisation of system congestion in both time slots and routing, the DCA further increases throughput. Implementing congestion routed relaying, especially with DCA, in any TDD-CDMA system with in-cell calls can show significant performance improvements over conventional cellular systems.
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Atkey, Robert. "Substructural simple type theories for separation and in-place update." Thesis, University of Edinburgh, 2006. http://hdl.handle.net/1842/892.
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This thesis studies two substructural simple type theories, extending the "separation" and "number-of-uses" readings of the basic substructural simply typed lambda-calculus with exchange. The first calculus, lambda_sep, extends the alpha lambda-calculus of O'Hearn and Pym by directly considering the representation of separation in a type system. We define type contexts with separation relations and introduce new type constructors of separated products and separated functions. We describe the basic metatheory of the calculus, including a sound and complete type-checking algorithm. We then give new categorical structure for interpreting the type judgements, and prove that it coherently, soundly and completely interprets the type theory. To show how the structure models separation we extend Day's construction of closed symmetric monoidal structure on functor categories to our categorical structure, and describe two instances dealing with the global and local separation. The second system, lambda_inplc, is a re-presentation of substructural calculus for in-place update with linear and non-linear values, based on Wadler's Linear typed system with non-linear types and Hofmann's LFPL. We identify some problems with the metatheory of the calculus, in particular the failure of the substitution rule to hold due to the call-by-value interpretation inherent in the type rules. To resolve this issue, we turn to categorical models of call-by-value computation, namely Moggi's Computational Monads and Power and Robinson's Freyd-Categories. We extend both of these to include additional information about the current state of the computation, defining Parameterised Freyd-categories and Parameterised Strong Monads. These definitions are equivalent in the closed case. We prove that by adding a commutativity condition they are a sound class of models for lambda_inplc. To obtain a complete class of models for lambda_inplc we refine the structure to better match the syntax. We also give a direct syntactic presentation of Parameterised Freyd-categories and prove that it is soundly and completely modelled by the syntax. We give a concrete model based on Day's construction, demonstrating how the categorical structure can be used to model call-by-value computation with in-place update and bounded heaps.
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Strauch, Paul E. "Nonlinear noise cancellation." Thesis, University of Edinburgh, 1997. http://hdl.handle.net/1842/1376.
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Noise or interference is often assumed to be a random process. Conventional linear filtering, control or prediction techniques are used to cancel or reduce the noise. However, some noise processes have been shown to be nonlinear and deterministic. These nonlinear deterministic noise processes appear to be random when analysed with second order statistics. As nonlinear processes are widespread in nature it may be beneficial to exploit the coherence of the nonlinear deterministic noise with nonlinear filtering techniques. The nonlinear deterministic noise processes used in this thesis are generated from nonlinear difference or differential equations which are derived from real world scenarios. Analysis tools from the theory of nonlinear dynamics are used to determine an appropriate sampling rate of the nonlinear deterministic noise processes and their embedding dimensions. Nonlinear models, such as the Volterra series filter and the radial basis function network are trained to model or predict the nonlinear deterministic noise process in order to reduce the noise in a system. The nonlinear models exploit the structure and determinism and, therefore, perform better than conventional linear techniques. These nonlinear techniques are applied to cancel broadband nonlinear deterministic noise which corrupts a narrowband signal. An existing filter method is investigated and compared with standard linear techniques. A new filter method is devised to overcome the restrictions of the existing filter method. This method combines standard signal processing concepts (filterbanks and multirate sampling) with linear and nonlinear modelling techniques. It overcomes the restrictions associated with linear techniques and hence produces better performance. Other schemes for cancelling broadband noise are devised and investigated using quantisers and cascaded radial basis function networks. Finally, a scheme is devised which enables the detection of a signal of interest buried in heavy chaotic noise. Active noise control is another application where the acoustic noise may be assumed to be a nonlinear deterministic process. One of the problems in active noise control is the inversion process of the transfer function of the loudspeaker. This transfer function may be nonminimum phase. Linear controllers only perform sub-optimally in modelling the noncausal inverse transfer function. To overcome this problem in conjunction with the assumption that the acoustic noise is nonlinear and deterministic a combined linear and nonlinear controller is devised. A mathematical expression for the combined controller is derived which consists of a linear system identification part and a nonlinear prediction part. The traditional filtered-x least mean squares scheme in active noise control does not allow the implementation of a nonlinear controller. Therefore, a control scheme is devised to allow a nonlinear controller in conjunction with an adaptive block least squares algorithm. Simulations demonstrate that the combined linear and nonlinear controller outperforms the conventional linear controller.
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Nedev, Nedko H. "Analysis of the impact of impulse noise in digital subscriber line systems." Thesis, University of Edinburgh, 2003. http://hdl.handle.net/1842/1366.
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In recent years, Digital subscriber line (DSL) technology has been gaining popularity as a high speed network access technology, capable of the delivery of multimedia services. A major impairment for DSL is impulse noise in the telephone line. However, evaluating the data errors caused by this noise is not trivial due to its complex statistical nature, which until recently had not been well understood, and the complicated error mitigation and framing techniques used in DSL systems. This thesis presents a novel analysis of the impact of impulse noise and the DSL framing parameters on transmission errors, building on a recently proposed impulse noise model. It focuses on errors at higher protocol layers, such as asynchronous transfer mode (ATM), in the most widely used DSL version, namely Asymmetric DSL (ADSL). The impulse noise is characterised statistically through its amplitudes, duration, inter-arrival times, and frequency spectrum, using the British Telecom / University of Edinburgh / Deutsche Telekom (BT/UE/DT) model. This model is broadband, considers both the time and the frequency domains, and accounts for the impulse clustering. It is based on recent measurements in two different telephone networks (the UK and Germany) and therefore is the most complete model available to date and suited for DSL analysis. A new statistical analysis of impulse noise spectra from DT measurements shows that impulse spectra can be modelled with three spectral components with similar bandwidth statistical distributions. Also, a novel distribution of the impulse powers is derived from the impulse amplitude statistics. The performance of a generic ADSL modem is investigated in an impulse noise and crosstalk environment for different bit rates and framing parameters. ATM cell and ADSL frame error rates, and subjective MPEG2 video quality are used as performance metrics. A new modification of a bit loading algorithm is developed to enable stable convergence of the algorithm with trellis coding and restricted subtone constellation size. It is shown that while interleaving brings improvement if set at its maximum depth, at intermediate depths it actually worsens the performance of all considered metrics in comparison with no interleaving. No such performance degradation is caused by combining several symbols in a forward error correction (FEC) codeword, but this burst error mitigation technique is only viable at low bit rates. Performance improvement can also be achieved by increasing the strength of FEC, especially if combined with interleaving. In contrast, trellis coding is ineffective against the long impulse noise error bursts. Alien as opposed to kindred crosstalk degrades the error rates and this is an important issue in an unbundled network environment. It is also argued that error free data units is a better performance measure from a user perspective than the commonly used error free seconds. The impact of impulse noise on the errors in DSL systems has also been considered analytically. A new Bernoulli-Weibull impulse noise model at symbol level is proposed and it is shown that other models which assume Gaussian distributed impulse amplitudes or Rayleigh distributed impulse powers give overly optimistic error estimates in DSL systems. A novel bivariate extension of the Weibull impulse amplitudes is introduced to enable the analysis of orthogonal signals. Since an exact closed-form expression for the symbol error probability of multi-carrierQAM assuming Bernoulli-Weibull noise model does not exist, this problem has been solved numerically. Multi-carrier QAM is shown to perform better at high signal-to-noise ratio (SNR), but worse at low SNR than single carrier QAM, in both cases because of the spreading of noise power between subcarriers. Analytical expressions for errors up to frame level in the specific case of ADSL are then derived from the impulse noise model, with good agreement with simulation results. The Bernoulli-Weibull model is applied to study the errors in single-pair highspeed DSL (SHDSL). The performance of ADSL is found to be better when the burst error mitigation techniques are used, but SHDSL has advantages if low bit error rate and low latency are required.
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Piątkowski, Michał. "Analysis of the losd-bearing capacity of truss girders with geometric imperfections : PhD thesis summary." Rozprawa doktorska, [s.n.], 2019. http://dlibra.tu.koszalin.pl/Content/1182.
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Smuga-Kogut, Małgorzata. "Method for the preparation of bioethanol from rye straw using ionic liquid : PhD thesis summary : [synopsis]." Rozprawa doktorska, [s.n.], 2014. http://dlibra.tu.koszalin.pl/Content/1319.
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Just, Krzysztof. "Metodology of the design the structure and controlling of the linear mechatronic device : PhD thesis summary." Rozprawa doktorska, [s.n.], 2017. http://dlibra.tu.koszalin.pl/Content/1050.
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Ślączka, Magdalena. "Biodegradation of selected hormonal modulators under technological processes and natural environmental conditions : PhD thesis summary : [synopsis]." Rozprawa doktorska, [s.n.], 2013. http://dlibra.tu.koszalin.pl/Content/1077.
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Dorywalski, Krzysztof. "Spectroscopic ellipsometry system in application tothe properties studies of wide-bandgap optoelectronic materials : PhD thesis summary." Rozprawa doktorska, [s.n.], 2014. http://dlibra.tu.koszalin.pl/Content/1069.
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Staruch, Anna. "Studies on deformability of a road base formed from selected natural aggregates : PhD thesis summary : [synopsis]." Rozprawa doktorska, [s.n.], 2013. http://dlibra.tu.koszalin.pl/Content/1083.
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Zedeler, Anne. "Palmitoylation and raft localization of the retrovirus Moloney MLV R-peptide studied by mutagenesis : PhD thesis /." Cph. : Department of Pharmacology, The Danish University of Pharmaceutical Sciences, 2005. http://www.dfuni.dk/index.php/Anne_Zedeler/1733/0/.
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Hasan, Khandaker Tabin. "A User Centric Interface for the Management of Past, Present and Future Events [PhD thesis presentation]." Doctoral thesis, Università degli studi di Trento, 2011. https://hdl.handle.net/11572/369241.
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Events have been categorized, modeled and recorded by researchers and practitioners for many centuries. Life and events are always being the philosopher's topic of debate. For us, event is any happening worth of remembering. This thesis makes an in-depth philological query of the nature of events and their intricate relationship to other events in the tapestry of complex social structures. We tried to understand our life events from grainy to vast in nature and size. Causation and effects are investigated and a simplified model is proposed for a user centric personal event management system which is fundamentally different from any existing system. Facts as a priori and stories as a posteriori has been separated by formal definition. Novel visualization and interaction is proposed to meet every individual's needs. The concept of lifelines has been introduced for the organizational requirements of a single person's life events that made it possible to distinguish from being the part of an event and being the witness of an event. This visualization model made it easier to manage causal relationships between events. Rich and intuitive interaction has been developed and proposed through the user-centric design process.
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Hasan, Khandaker Tabin. "A User Centric Interface for the Management of Past, Present and Future Events [PhD thesis presentation]." Doctoral thesis, University of Trento, 2011. http://eprints-phd.biblio.unitn.it/568/2/Event_Centric_Interface-PhD_presentation.v2.pdf.
Full textAbstract:
Events have been categorized, modeled and recorded by researchers and practitioners for many centuries. Life and events are always being the philosopher's topic of debate. For us, event is any happening worth of remembering. This thesis makes an in-depth philological query of the nature of events and their intricate relationship to other events in the tapestry of complex social structures. We tried to understand our life events from grainy to vast in nature and size. Causation and effects are investigated and a simplified model is proposed for a user centric personal event management system which is fundamentally different from any existing system. Facts as a priori and stories as a posteriori has been separated by formal definition. Novel visualization and interaction is proposed to meet every individual's needs. The concept of lifelines has been introduced for the organizational requirements of a single person's life events that made it possible to distinguish from being the part of an event and being the witness of an event. This visualization model made it easier to manage causal relationships between events. Rich and intuitive interaction has been developed and proposed through the user-centric design process.
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Ong, Kian P. "Signal processing for airborne bistatic radar." Thesis, University of Edinburgh, 2003. http://hdl.handle.net/1842/1370.
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The major problem encountered by an airborne bistatic radar is the suppression of bistatic clutter. Unlike clutter echoes for a sidelooking airborne monostatic radar, bistatic clutter echoes are range dependent. Using training data from nearby range gates will result in widening of the clutter notch of STAP (space-time adaptive processing) processor. This will cause target returns from slow relative velocity aircraft to be suppressed or even go undetected. Some means of Doppler compensation for mitigating the clutter range dependency must be carried out. This thesis investigates the nature of the clutter echoes with different radar configurations. A novel Doppler compensation method using Doppler interpolation in the angle-Doppler domain and power correction for a JDL (joint domain localized) processor is proposed. Performing Doppler compensation in the Doppler domain, allows several different Doppler compensations to be carried out at the same time, using separate Doppler bins compensation. When using a JDL processor, a 2-D Fourier transformation is required to transform space-time domain training data into angular-Doppler domain. Performing Doppler compensation in the spacetime domain requires Fourier transformations of the Doppler compensated training data to be carried out for every training range gate. The whole process is then repeated for every range gate under test. On the other hand, Fourier transformations of the training data are required only once for all range gates under test, when using Doppler interpolation. Before carrying out any Doppler compensation, the peak clutter Doppler frequency difference between the training range gate and the range gate under test, needs to be determined. A novel way of calculating the Doppler frequency difference that is robust to error in pre-known parameters is also proposed. Reducing the computational cost of the STAP processor has always been the desire of any reduced dimension processors such as the JDL processor. Two methods of further reducing the computational cost of the JDL processor are proposed. A tuned DFT algorithm allow the size of the clutter sample covariance matrix of the JDL processor to be reduced by a factor proportional to the number of array elements, without losses in processor performance. Using alternate Doppler bins selection allows computational cost reduction, but with performance loss outside the clutter notch region. Different systems parameters are also used to evaluate the performance of the Doppler interpolation process and the JDL processor. Both clutter range and Doppler ambiguity exist in radar systems operating in medium pulse repetitive frequency mode. When suppressing range ambiguous clutter echoes, performing Doppler compensation for the clutter echoes arriving from the nearest ambiguous range alone, appear to be sufficient. Clutter sample covariance matrix is estimated using training data from the range or time or both dimension. Investigations on the number of range and time training data required for the estimation process in both space-time and angular-Doppler domain are carried out. Due to error in the Doppler compensation process, a method of using the minimum amount of range training data is proposed. The number of training data required for different clutter sample covariance matrix sizes is also evaluated. For Doppler interpolation and power correction JDL processor, the number of Doppler bins used can be increased, to reduce the amount of training data required, while maintaining certain desirable processor performance characteristics.
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Manwaring, Kevan. "The Knowing : a Fantasy ; An epistemological enquiry into creative process, form, and genre." Thesis, University of Leicester, 2018. http://hdl.handle.net/2381/43111.
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This creative writing PhD thesis consists of a novel and a critical reflective essay. Both articulate a distinctive approach to the challenges of writing genre fiction in the 21st Century that I define as 'Goldendark' - one that actively engages with the ethical and political implications of the field via the specific aesthetic choices made about methodology, content, and form. The Knowing: A Fantasy is a novel written in the High Mimetic style that, through the story of Janey McEttrick, a Scottish-Cherokee musician descended from the Reverend Robert Kirk, a 17th Century Episcopalian minister from Aberfoyle (author of the 1691 monograph, The Secret Commonwealth of Elves, Fauns and Fairies), fictionalises the diasporic translocation of song- and tale-cultures between the Scottish Lowlands and the Southern Appalachians, and is a dramatisation of the creative process. In the accompanying critical reflective essay, 'An Epistemological Enquiry into Creative Process, Form and Genre', I chart the development of my novel: its initial inspiration, my practice-based research, its composition and completion, all informed both by my practice as a storyteller/poet and by my archival discoveries. In the section 'Walking Between Worlds' I articulate my methodology and seek to defend experiential research as a multi-modal approach - one that included long-distance walking, illustration, spoken word performance, ballad-singing and learning an instrument. In 'Framing the Narrative' I discuss matters of form - how I engaged with hyperfictionality and digital technology in destabilising traditional conventions of linear narrative and generic expectation. Finally, in 'Defining Goldendark' I articulate in detail my approach to a new ethical aesthetics of the fantasy genre.
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Rahman, Md Khalilur. "The lipid metabolite analogue CTU activates death and survival pathways in breast cancer cells." Thesis, University of Sydney, 2020. https://hdl.handle.net/2123/22682.
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Abstract: Triple-negative breast cancer (TNBC) is one of the most aggressive tumour types. The absence of identified tumour proteins that promote TNBC progression has prevented the development of targeted therapies for TNBC. These tumours have a poorer prognosis than other breast cancer subtypes. There is an unmet need for new agents with low toxicity for the treatment of TNBC because current approaches are limited to toxic drug combinations of low efficacy. Based on experimental and epidemiological evidence, ω-3 polyunsaturated fatty acids (PUFAs) are a potential source of new anti-cancer drugs. A recently identified aryl-substituted ω-3 PUFA epoxide analogue, termed CTU, effectively killed TNBC cells in vitro and in mouse xenograft models in vivo without producing toxicity (Rawling et al., 2017). However, there was a residual cell population that survived exposure to CTU. In order to maximise the activity of new agents like CTU, it is important to understand why some cells survive. The present project evaluated the mechanisms underlying residual TNBC cell survival after CTU. mRNA high throughput sequencing (mRNA-Seq) was performed to identify deregulated genes in CTU treated MDA-MB-231 cells (10 µM, 24h). Bioinformatics was used to identify biological networks for differentially expressed genes, and real-time PCR (RT-PCR) and Western immunoblotting were employed to validate the data. In RNA-Seq profiling, there were 16141 differentially expressed genes with 1493 (up/down: 642/851) that were altered using a two-fold cut-off criterion (p<0.05). Ingenuity Pathway Analysis (IPA) software identified 22 inflammation-related genes in CTU-treated cells that were up-regulated, including cyclooxygenase-2 (COX-2), interleukin-6 (IL-6), interleukin-8 (IL-8), and Granulocyte-macrophage colony-stimulating factor (GM-CSF). Altered mRNA expression was validated by RT-PCR, and mRNA changes for IL-6, IL-8 and GM-CSF were corroborated at the protein level by ELISA and LEGENDplex™ Multi-Analytes Flow Assay Kit. COX-2 expression was measured by Western blot assay and the formation of the major COX-2 product prostaglandin E2 (PGE2) was assessed by ELISA. Chemotherapy-induced increases in pro-tumourigenic factors have been linked to the expansion of tumour-initiating cell populations. The self-renewal ability of CTU treated cells was examined using the non-adherent, in vitro colony-forming mammosphere assay. It was found that CTU expanded the proportion of tumour-initiating cells to 2.2-fold of control. However, the addition of neutralising antibodies against IL-8, IL-6 and GM-CSF during the 72 h recovery phase post-CTU treatment blocked the ability of CTU-treated MDA-MB-231 cells to form mammospheres. Similar findings were obtained when the functional activity of COX-2 was blocked by a specific pharmacological inhibitor (CAY10104). From established functional network analysis, the pro-tumourigenic factors that are activated by CTU share several potential response elements in their proximal promoters, including those for the transcription factors NF-κB and XBP1s, that were activated in CTU treated cells. Moreover, co-treatment of cells with CTU and inhibitors of the NF-κB p65 subunit and XBP1 prevented the activation of pro-tumourigenic factors and self-renewal. These findings suggest that CTU increases the production of pro-tumourigenic factors in MDA-MB-231 breast cancer cells by activation of the XBP1s and NF-κB pathways. The capacity of CTU to prevent the growth of MDA-MB-231 TNBC cells is associated with activation of the unfolded protein response (UPR) and Endoplasmic Reticulum (ER) stress. The treatment of MDA-MB-231 cells with CTU activated the three principal ER stress sensors: protein kinase RNA-like endoplasmic reticulum kinase (PERK), activating transcription factor 6 (ATF6) and inositol-requiring enzyme 1 (IRE1). Pharmacological inhibitors of PERK and ATF6, but not IRE1, prevented CTU dependent caspase-3 cleavage and apoptosis. The PERK and ATF6 pathways activated cell death via the downstream protein CHOP. In contrast, the IRE1 inhibitor GSK2850163 prevented the increase in the self-renewal ability of MDA-MB-231 cells elicited by treatment with CTU. IRE1 inhibition also significantly prevented the activation of pro-inflammatory and pro-tumourigenic factors. To further evaluate the general significance of these findings in TNBC, two other sub-lines - HCC1395 and HCC1806 - were treated with CTU, and the regulation of pro-tumourigenic factor was assessed. Findings with HCC1806 TNBC cells were similar to those in MDA-MB-231 cells. Thus, CTU activated the IRE1, NF-κB and XBP1s pathways and the expression of COX-2 and promoted mammosphere development. In contrast, CTU treatment of HCC1395 TNBC cells did not activate pro-tumourigenic factors or mammosphere formation. Taken together, the present findings suggest that CTU upregulates pro-tumourigenic factors in certain TNBC sub-lines, exemplified by MDA-MB-231 and HCC1806, by activating the IRE1 arm of the ER stress mechanism. This promotes survival and decreases CTU efficacy. Inhibition of IRE1 may be a novel approach that could be used in combination to optimise the clinical application in TNBC of novel anti-cancer lipids like CTU.
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Gupta, Amitava Sen. "Some experimental and theoretical studies of travelling ionospheric disturbances." Thesis, University of Delhi, 2009. http://localhost:8080/xmlui/handle/123456789/1603.
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Arun, T. "Geomagnetic signatures at Antarctica- diagnostics of internal and external fields." Thesis, IIG, 2002. http://localhost:8080/xmlui/handle/123456789/1575.
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Joshi, Harish P. "Trans-ionospheric radio propagations studies using satellite transmission." Thesis, Saurashtra University, 1989. http://localhost:8080/xmlui/handle/123456789/1602.
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Enamundram, Chandrasekhar. "Determination of deep earth electrical conductivity using long period geomagnetic variations." Thesis, IIG, 1998. http://localhost:8080/xmlui/handle/123456789/1570.
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Kuczyński, Waldemar. "Investigation into boiling in the refrigerant flow under the conditions of periodically generated disturbance : PhD thesis summary." Rozprawa doktorska, [s.n.], 2009. http://dlibra.tu.koszalin.pl/Content/1197.
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