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Dissertations / Theses on the topic 'Fasore'

Author: Grafiati
Published: 4 June 2021
Last updated: 11 February 2022

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1

Fioresi, Adriano. "A new method to characteriz e monitoring platforms for dynamic distribution systems." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/12387/.

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Nell'esercizio della Distribuzione Elettrica, molte applicazioni come il controllo dei ussi di potenza e la stabilità della tensione, richiedono la conoscenza dello stato della rete. Queste informazioni possono essere ottenute aggregando misure disponibili della rete, seppur di diversa natura, e applicando ad esse algoritmi di Stima di Stato. Diversi fattori possono avere un impatto sull'incertezza della stima di stato nel caso in cui alcune grandezze della rete stiano evolvendo dinamicamente. Lo scopo di questo lavoro è quello di identificare i diversi contributi che incidono sulla accuratezza del risultato della Stima di Stato globale durante il verificarsi di eventi di natura dinamica. Tra questi si citano quali veloci variazioni della potenza generata da parte di fonti di energia rinnovabili e uttuazioni della domanda di potenza da parte clienti della rete. I test eseguiti evidenziano l'importanza del porre particolare attenione agli effetti portati da queste dinamiche allo scopo di identificare le incertezze che affliggono il sistema di monitoraggio della rete.
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Fiebrandt, Julia [Verfasser], Hartmut [Akademischer Betreuer] Bartelt, Stefan [Akademischer Betreuer] Nolte, and Johannes [Akademischer Betreuer] Roths. "Eigenschaften von Faser-Bragg-Gittern in seltenerddotierten optischen Fasern / Julia Fiebrandt. Gutachter: Hartmut Bartelt ; Stefan Nolte ; Johannes Roths." Jena : Thüringer Universitäts- und Landesbibliothek Jena, 2014. http://d-nb.info/1050978013/34.

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3

Polz, Leonhard [Verfasser], Hartmut [Gutachter] Bartelt, Robert R. J. [Gutachter] Maier, Andreas [Gutachter] Rüger, and Johannes [Gutachter] Roths. "Regenerieren von Faser-Bragg-Gittern in polarisationserhaltenden optischen Fasern / Leonhard Polz ; Gutachter: Hartmut Bartelt, Robert R. J. Maier, Andreas Rüger, Johannes Roths." Jena : Friedrich-Schiller-Universität Jena, 2018. http://d-nb.info/1170399193/34.

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4

Aycock, John Daniel. "Faster Tomita parsing." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/MQ34479.pdf.

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Pålvik, Richard. "H.P. Lovecraft : Narratologisk analys av atmosfär och fasor." Thesis, Linnéuniversitetet, Institutionen för film och litteratur (IFL), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-26630.

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Even though the American author H.P. Lovecraft (1890-1937) has been praised as one of the most influential writers of horror literature in the 20th century, his style of writing has occasionally been criticized. Lovecraft was using a writing style based on strict scientific language, where the human condition and existence are irrelevant in the narrative. This includes less focus on character development and more on the importance of atmosphere and environments. I am presenting narratological analyzes of what is often considered to be three of Lovecraft’s “greatest works”: “The Call of Cthulhu”, At the Mountains of Madness, and “The Shadow over Innsmouth.” These analyzes are used to highlight Lovecraft’s science-oriented language and narratological techniques, with the focus of studying what methods Lovecraft was using to give his works and his readers a sense of dread, hopelessness, and an alien atmosphere. I believe that the usage of scientific language creates a sense of authenticity, while the presence of strange alien names and phrases adds to the fantastic atmosphere. My intention with this thesis is to show that these literary techniques are not the product of an amateurish or untalented author, but that it actually fills a purpose, which you got to have in mind in order to understand the dark, fantastic world that he develops in the majority of his fiction. I also believe this is crucial when attempting to understand Lovecraft’s influence and importance in the world of horror literature.
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Wulfinghoff, Malte [Verfasser], and Josephus D. M. [Akademischer Betreuer] Platenkamp. "Tour du Faso : Sport und nationale Identität in der multiethnischen Gesellschaft Burkina Fasos / Malte Wulfinghoff ; Betreuer: Josephus D. M. Platenkamp." Münster : Readbox Unipress / Münster (Westf), 2019. http://d-nb.info/1177145499/34.

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7

Chmelik, Christian, Helge Bux, Jürgen Caro, Lars Heinke, Florian Hibbe, Tobias Titze, and Jörg Kärger. "Faster by opposing the stream." Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-185127.

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8

Menzies, Lindsey. "Jigsaws and faster fractal pictures." Thesis, University of Glasgow, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.363150.

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Chmelik, Christian, Helge Bux, Jürgen Caro, Lars Heinke, Florian Hibbe, Tobias Titze, and Jörg Kärger. "Faster by opposing the stream." Diffusion fundamentals 16 (2011) 49, S. 1-2, 2011. https://ul.qucosa.de/id/qucosa%3A13786.

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10

Zarambukas, Michalis. "Přestavba experimentálního vozidla Formula Faster." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229715.

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The main purpose of this diploma thesis is the experimental vehicle Formula Faster engine reconstruction. The current Ford Kent 1600cc engine will be replace by the Škoda 1.4 MPI engine. The next task is to analyse kinematic properties of the front axle and subsequent optimization and transformation of steering rod placing which relates to wheel toe and bump travel. The last part is concerned with steering wheel mounting transformation, concretely with reconstruction to obtain removable steering wheel using rapid coupling.
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Kidane, Tesfaye Kebede. "Toward Faster and Quieter MRI." Case Western Reserve University School of Graduate Studies / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=case1118850517.

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12

Lundén, Philip. "Faster faster, cheaper cheaper : A study about how fast fashion brands have affected luxury brands." Thesis, Högskolan i Borås, Akademin för textil, teknik och ekonomi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-12722.

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Today it seems like fast fashion brands are affecting luxury brands. Have the fast fashion brands been ignored too long and have luxury brands failed at protecting their brand values?  Luxury fashion brands make collaborations with fast fashion designers, something that would have been unthinkable a long time ago. Luxury brands have increased their number of seasons, some have diffusion lines and others sell online on their own websites. Luxury brands and fast fashion brands are sold on the same streets, worn by the same customers and can be found in the same magazines. Once fast fashion brands were irrelevant for the luxury brands and they ignored them, but time has changed. Fast fashion has affected the luxury industry in several ways. “Fast design turnover”, “Limited-edition products”, “brand communication”, “celebrity products and brand endorsement”, “prestige retail location” and“co-branding with luxury fashion designers” are just examples of tactics fast fashion brands use to imitate luxury brands (Okonkwo, 2007). But luxury brands have characteristics that fast fashion brands don’t such as high quality, exclusivity, high prices, status, and offer highlevels of symbolic and emotional values (Tynan, McKechnie, & Chhuon, 2009). Common characteristics for fast fashion brands are trendy clothing, cheap, interpreted after fashion shows and the collections are delivered quickly (Plunkett, 2010). This study is of qualitative nature and the topic is under-researched academically, which makes it more interesting to explore. However, the fast fashion and luxury fashion has been examined by an extensive literature review. The fast fashion has been dominating the fashion industry in recent years. The purpose was to find out how fast fashion brands and luxury fashion brands were connected. Seven interviews were conducted with people working in the luxury industry. Luxury and fast fashion, consumers, e-commerce, seasons and collaborations will be explored in this paper. This dissertation will mainly focus on how the fast fashion already has affected luxury brands. The conclusion was that luxury brands have been affected by fast fashion brands in numerous ways, it seems to affect bigger luxury brands more than independent designers. Clearly, the luxury industry has been affected by the fast fashion industry.
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13

Zürner, Jörg [Verfasser]. "Piezo-Faser-Composite zur Schwingungsbeeinflussung von Faser-Verbund-Kunststoffen / Jörg Zürner." Aachen : Shaker, 2004. http://d-nb.info/117054407X/34.

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14

Aggarwal, Charu C., Haim Kaplan, and Robert E. 1948 Tarjan. "A Faster Primal Network Simplex Algorithm." Massachusetts Institute of Technology, Operations Research Center, 1996. http://hdl.handle.net/1721.1/5266.

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We present a faster implementation of the polynomial time primal simplex algorithm due to Orlin [23]. His algorithm requires O(nm min{log(nC), m log n}) pivots and O(n2 m ??n{log nC, m log n}) time. The bottleneck operations in his algorithm are performing the relabeling operations on nodes, selecting entering arcs for pivots, and performing the pivots. We show how to speed up these operations so as to yield an algorithm whose running time is O(nm. log n) per scaling phase. We show how to extend the dynamic-tree data-structure in order to implement these algorithms. The extension may possibly have other applications as well.
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15

Munshi, Siddharth. "Faster algorithms for stable allocation problems." Connect to this title online, 2007. http://etd.lib.clemson.edu/documents/1193080488/.

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16

Termier, Alexandre. "Pattern mining rock: more, faster, better." Habilitation à diriger des recherches, Université de Grenoble, 2013. http://tel.archives-ouvertes.fr/tel-01006195.

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Le pattern mining est un domaine du data mining dont le but est l'extraction de régularité dans les données. Ce document présente nos contributions au domaine selon 3 axes : 1. Le domaine du pattern mining est jeune et il y existe encore beaucoup de types de régularités qu'un analyste serait intéressé de découvrir mais qui ne sont pas encore gérées. Nous avons contribué à deux nouveaux types de patterns: les patterns graduels et les patterns périodiques avec "ruptures". Nous avons aussi proposé ParaMiner, un algorithme original pour le pattern mining générique, qui permet à des analystes de spécifier directement le type de patterns qui les intéressent. 2. Le pattern mining demande beaucoup de ressources de calcul. Pour réduire le temps de calcul, nous avons étudié comment exploiter le parallélisme des processeurs multicoeurs. Nos résultats montrent que des techniques classiques en pattern mining sont mal adaptées au parallélisme, et nous avons proposé des solutions. 3. Notre objectif à long terme est de rendre le pattern mining plus facile à utiliser par les analystes. Il y a beaucoup à faire dans ce but, actuellement les analystes doivent travailler sur de longues listes de millions de patterns. Nous présentons nos premiers résultats, dans le contexte de la fouille de traces d'exécution de processeurs.
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17

Steinbrenner, Todd James. "Citius, Altius, Fortius: faster, higher, stronger." Monterey, California: Naval Postgraduate School, 2013. http://hdl.handle.net/10945/34747.

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Approved for public release; distribution is unlimited
Chinese elite female athletes have experienced extraordinary success in international athletic competitions. Since 1992, elite women athletes have been more represented and successful in the Olympics and National Championships then men; while accounting for less than 50 percent of the elite athletes in China, and competing in less Olympic events, in the Olympics, women were represented in less than 50 percent of the events until 2012. Concisely, the rise of Chinese female athletic participation and success in international competitions has become the backbone for Chinas rise to sports relevance, and has been unlike historical Western nation-states experience in athletics. This historical examination chronologically documents the rise of Chinese elite female athletes and the policies affecting athletes from 1949 to the present, and reveals a connection between female athletic success and state enforced gender equality policies that targeted culture, education, and labor. Through gender equality policies, men and women were uniformly exposed to a national sports system that invested in research, training, equipment, recruitment, and incentivizing athletes to win honors for the country. Moreover, this examination evaluates various hypotheses on what Chinese policies, if any, have produced these extraordinary results, and proposes the sports system, although exceptionally successful, is ultimately imbalanced and plateauing, while the Chinese Communist Party desires participation, power, and control at the expense of possible broad athletic victory.
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18

Stoll, Detlef. "Nichtlineare Wellenausbreitung in Single-Mode-Fasern /." Düsseldorf : VDI Verlag, 1994. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=006517067&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.

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19

Ma̧dry, Aleksander. "Faster generation of random spanning trees." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/55126.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2009.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 39-40).
In this thesis, we set forth a new algorithm for generating approximately uniformly random spanning trees in undirected graphs. We show how to sample from a distribution that is within a multiplicative (1+6) of uniform in expected time ... . This improves the sparse graph case of the best previously known worst-case bound of O(min{mn, n2. 376}), which has stood for twenty years. To achieve this goal, we exploit the connection between random walks on graphs and electrical networks to introduce a new approach to the problem that integrates discrete random walk-based techniques with continuous linear algebraic methods. We believe that our use of electrical networks and sparse linear system solvers in conjunction with random walks and combinatorial partitioning techniques is a useful paradigm that will find further applications in algorithmic graph theory. This work was done in collaboration with Jonathan Kelner.
by Aleksander Ma̧dry.
S.M.
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20

McGinley, Susan. "Determining Bull Fertility: A Faster Test." College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2006. http://hdl.handle.net/10150/622171.

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21

Vieira, Pedro César Cordeiro. "Estudo do desempenho de canais de instrumentação para a medição sincronizada de fasores." reponame:Repositório Institucional da UFSC, 2014. https://repositorio.ufsc.br/xmlui/handle/123456789/123171.

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Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico, Programa de Pós-Graduação em Engenharia Elétrica, Florianópolis, 2014.
Made available in DSpace on 2014-08-06T17:53:55Z (GMT). No. of bitstreams: 1 326660.pdf: 7483181 bytes, checksum: daa90a83e5028a2df160133d5b29ad96 (MD5) Previous issue date: 2014
Sistemas de Medição Fasorial Sincronizada constituem uma ferramenta que permite o monitoramento em tempo real da dinâmica dos sistemas elétricos de potência. Aplicações que fazem uso de sincrofasores podem ser sensíveis aos erros de medição. Desta maneira, as normas aplicáveis à medição fasorial exigem elevados requisitos de exatidão e desempenho por parte dos equipamentos de medição. Entretanto, o erro fasorial total em uma instalação de medição de fasores é consequência não só da unidade de medição, mas de toda a cadeia de instrumentos, denominada Canais de Instrumentação, cuja finalidade é adequar os sinais de tensão e corrente para patamares mensuráveis, e transportar esses sinais até os instrumentos de medição. Neste trabalho é investigada a influência produzida pelos Canais de Instrumentação nos erros de medição, do ponto de vista da tecnologia de medição fasorial sincronizada. Para tanto são discutidos os aspectos de exatidão que abrangem todos os equipamentos que compõem um Canal de Instrumentação típico, incluindo a própria unidade de medição fasorial. É realizada a correlação dos conceitos adotados pelas normas, e proposto um índice de avaliação do erro fasorial global, que incorpora a contribuição de todos os equipamentos. Em seguida é feita a modelagem dos equipamentos do Canal de Instrumentação. Através desta modelagem são realizadas diversas simulações computacionais, com o intuito de verificar a magnitude dos erros fasoriais, presentes em uma instalação de medição fasorial. Estas simulações são realizadas nas condições nominais de operação dos equipamentos, nas condições de testes de regime permanente e regime dinâmico exigidas pela norma de medição fasorial, e durante eventos reais observados no sistema elétrico brasileiro. Os resultados obtidos mostram que as atuais normas aplicadas a CI permitem erros fasoriais muito superiores aos exigidos pela norma de medição fasorial. Além disso, os resultados de simulação mostram que os CI podem provocar erros fasoriais elevados, principalmente quando submetidos a condições onde os parâmetros do sinal de entrada (tensão e corrente) estão fora dos seus valores nominais.

Abstract : Synchronized Phasor Measurement Systems represent a useful tool on real time monitoring of power systems dynamics. Applications that use synchrophasors may be sensitive to measurement errors. Thus, the phasor measurement standards require high accuracy levels from measurement equipments. However, the total phasor error on a phasor measurement installation is not caused only by the measurement unit, but by the entire instruments network, called Instrumentation Channel. The Instrumentation Channel function consists in adjusting the voltage and current signals to measurable levels, and transport these signals to the measurement instruments. In this work, the influence of Instrumentation Channels on measurement errors is investigated, from the point of view of synchronized phasor measurement technology. For that purpose, the accuracy aspects that cover all the equipaments which compose a typical Instrumentation Channel are analyzed, including the phasor measurement unit itself. The concepts used by the standards are correlated and then an evaluation index for the global phasor error, that incorporates all equipment contribution, is proposed. After that, the modelling of Instrumentation Channel equipments is developed. Through this modelling, many computational simulations are performed, in order to verify the magnitude of phasor errors, present in a phasor measurement installation. These simulations are performed on nominal operation conditions, on test conditions of steady state and transient required by phasor measurement standard, and during real events observed on the Brazilian Interconnected Power System. The results show that the current standards, applied to Instrumentation Channels, allow phasor errors much higher than those required by the phasor measurement standard. Furthermore, the simulation results show that the instrumentation channels may produce high phasor errors, especially when facing conditions where the parameters of the input signal (voltage and current) are different from their nominal values.
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22

Schuler, Frank [Verfasser], and Wolfgang [Akademischer Betreuer] Breit. "Richtungsanalyse von Fasern in Beton und Charakterisierung von rissquerenden Fasern mittels Computer-Tomografie / Frank Schuler ; Betreuer: Wolfgang Breit." Kaiserslautern : Technische Universität Kaiserslautern, 2020. http://d-nb.info/1224883845/34.

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23

Di, Luccio Luca. "Entertainement [!] for faster driving takeovers : Designing games for faster and safer takeovers on level 3 self-driving cars." Thesis, Högskolan i Skövde, Institutionen för informationsteknologi, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-18690.

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The upcoming level 3 generation of self-driving vehicles will be characterized by the freedom of not having the driver’s hands on the steering wheel. This acquired freedom is posing new challenges on the traditional passenger comfort paradigm as the drivers will spend a higher amount of time doing non-driving tasks (NDRT). Certain constraints must be imposed as the level 3 generation systems will not be able to drive all the time without active feedback from the user. The driver needs to stay active enough to do takeover in a situation where it is needed to. What effect will different NDRT have on the behavior of a driver in a self-driving car? In our low fidelity driving simulator, we tested different simple actions (e.g. playing a simple 2D game). We then evaluated them based on their accident avoidance and situation awareness in the post-transition period. The results show a significant difference between the reaction speeds of the drivers before and after an active task.
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Tomioka, Jorge. "Modelagem de carga utilizando medidores de fasor em análise de estabilidade transitória." Universidade de São Paulo, 1995. http://www.teses.usp.br/teses/disponiveis/18/18133/tde-25012018-104745/.

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O objetivo principal deste trabalho é o desenvolvimento de algoritmos para análise de estabilidade transitória com esforço computacional reduzido. Com este propósito é desenvolvido uma metodologia para o equivalente dinâmico, a qual é um resultado da eliminação das barras de cargas providas com diferentes modelagens: PQ como constante, PQ como função de tensão e PQ como função de tensão e frequência. O sistema elétrico de potência é reduzido à barras geradoras internas através do método clássico de determinação de equivalentes desenvolvidos por Ward. Uma versão melhorada do equivalente de Ward atualiza a injeção de corrente equivalente nas barras geradoras internas através da utilização das Unidades Medidoras de fasores (PMU\'s) que fornecem os desvios angulares de potência das unidades geradoras e ele uma matriz ele sensibilidade W. A atualização da injeção ele corrente equivalente nas barras geradoras internas é efetuada através da matriz de sensibilidade W para cada novo ponto ele operação. A técnica utilizada para o desenvolvimento da matriz de sensibilidade W foi feita atráves da linearização da equação do fluxo de carga não linear e considerando diferentes modelagens das cargas. Programas que levam em consideração os aspectos acima foram desenvolvidos onde as diferentes modelagens de cargas são incorporadas. Para isto, o sistema AEP de 14 barras foi utilizado como teste para este projeto.
The development of algorithms for analysis of transient stability with reduced computational effort is the main objective of this work. With that purpose a methodology to build reduced equivalents of a power system in a dynamic way is developed. The expression for the injected equivalent currents at the generator buses, is a result of load buses elimination corresponding to different load models, that is: constant PQ loads, PQ as voltage dependency model,as well as PQ as voltage and frequency dependency models. The electric power system is reduced to the generator buses only, using the classic methodology for equivalents developed by Ward. An improved version for the Ward equivalent updates the injected equivalent currents at the generator buses through the use of the phasor measurement units (PMU\'s) and a sensitivity matrix W; those units give the power angle deviation of the generators when some perturbation is applied to the system. In the process of correcting the injected equivalent currents the sensitivity matrix W is updated every time the operating point changes significatively. The technique used in developing the sensitivity matrix W was made through linearization of the load flow equations applied to the different load models. Computer programs taking the considerations above mentioned were developed. The AEP-14 bus power system was used to test the models proposed on this work.
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Hahn, Harald. "Modularer Ansatz zu multifunktionellen Polymer-Peptid-Fasern." Phd thesis, Universität Potsdam, 2009. http://opus.kobv.de/ubp/volltexte/2009/3301/.

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Die Kombination von Polymeren mit Peptiden vereint die Eigenschaften beider Stoffklassen miteinander. Dabei können die strukturbildenden Eigenschaften der Peptide genutzt werden, um Polymere zu organisieren. In der vorliegenden Arbeit wurde ein Polymer-Peptid-Konjugat verwendet, das sich in Wasser zu Bändern anordnet. Die treibende Kraft für diesen Prozess ist die Anordnung des Peptidteils zu β-Faltblattstrukturen. Das Polymer-Peptid-Aggregat besitzt einen Peptidkern mit funktionalen Oberflächen, der lateral von einer Polyethylenoxidschale umgeben ist. Durch Änderung der Peptidsequenz war es bisher möglich, die Eigenschaften dieser Fasern zu variieren. In der Arbeit wird ein modularer Ansatz zur vielfältigen Modifizierung einer Polymer-Peptid-Faser entwickelt. So ist es möglich, die Eigenschaften der Fasern einzustellen, ohne die strukturbildende β-Faltblattsequenz verändern zu müssen. Um weitere Funktionen an den Fasern anzubringen, wurde die 1,3-dipolaren Addition verwendet. Diese Reaktion beschreibt die konzertierte Umlagerung eines Azides mit einem Alkin. Sie ist in den meisten Lösungsmitteln unter hohen Ausbeuten durchführbar. Im Rahmen der Arbeit wird die Erzeugung von Aziden untersucht und auf die Polymer-Peptid-Fasern übertragen. Der Diazotransfer stellte dabei die Methode der Wahl dar, so können Azidgruppen aus Aminen gewonnen werden. Unter Verwendung der 1,3-dipolaren Addition konnten verschiedene alkinfunktionale Moleküle kovalent an die azidfunktionalisierten Polymer-Peptid-Fasern gebunden werden. So wurde ein Fluoreszenzfarbstoff an die Fasern gebunden, der eine Abbildung der Fasern mittels konfokaler Mikroskopie erlaubte. Weiterhin wurden die Eigenschaften der Fasern durch Addition dreier carboxylfunktionaler Moleküle modifiziert. Diese Fasern konnten weiter genutzt werden, um Kalzium zu binden. Dabei variierte die Anzahl der gebundenen Kalziumionen in Abhängigkeit der jeweiligen Fasermodifikation erheblich. Weitere Untersuchungen, die Morphologie von Kalziumcarbonatkristallen betreffend, werden aktuell durchgeführt. Die kovalente Anbringung eines reduzierenden Zuckers an die Polymer-Peptid-Fasern erlaubt die Abscheidung von Silber aus Tollens Reagenz. Durch eine Entwicklung analog zur Schwarz-Weiss-Photographie können in nachfolgenden Arbeiten so Silberdrähte in Nanogröße erzeugt werden. An die azidfunktionalen Fasern können weitere funktionale Moleküle angebracht werden, um die Eigenschaften und das Anwendungsspektrum der Polymer-Peptid-Fasern zu erweitern.
The combination of polymer with peptides combines the advantages of both substance classes. It is possible to use peptide structure-forming properties to assemble polymers. In my current research, a self assembling Polymer-Peptide-Conjugate was used, which forms ribbon-like structures in water. The peptide tendency to form β-sheets is the driving force for this process. The resulting Polymer-Peptide-Aggregate is build up of a core shell model, where the peptides are the core and the polymer (polyethylene oxide) is the lateral suited shell. A new peptide synthesis was necessary in order to change the functional groups in the peptide core. In my present work a modular strategy was developed to get access to various types of modified Polymer-Peptide-Fiber. This allows adjustiment to the fiber properties without changing the structure forming b‑sheet sequence. To apply these functions, 1,3‑dipolar addition was used. This reaction described the simultaneous reactions of alkynes and azides. The reaction occurs in most solvents under high yields. In the context of this work, the generation of azides was investigated and transferred to the Polymer-Peptide-Fibers. Diazotransfer was the chosen method to transfer primary amines into azidefunctions at the fiber surface. With the use of 1,3‑dipolar addition it was possible to bind alkyne functionalized molecules covalent to the azide functionalized fibers. A fluorescent dye was bound to the fibers to image these fibers with confocal microscopy. The properties of the azide fibers were further modified to incorporation three different carboxylic molecules. These fibers were used to estimate the calcium binding affinity. Thus, differing the number of bonded calcium is a function of the used fiber attachment. Investigations concerning the morphology of Calcium carbonate crystals can be done. The covalent attachment of reducing sugar to the Polymer-Peptide-Fibers should will allow the production of silver(0)clusters along the fibers with the use of Tollens´ reagent. With the help of a developer solution, similar to black and white photography, the possibility to archive silverrods in nanometer size can be obtained. The applied modifications on fibers is hence a promising first step in altering fibers in which by adjusting its properties, we broaden the applications of these Polymer-Peptide-Fibers.
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26

Liem, Sebastian. "Faster Dark Matter Calculations Using the GPU." Thesis, Stockholms universitet, Fysikum, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-62474.

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We have investigated the use of the graphical processing unit to accelerate the software package DarkSUSY. DarkSUSY is, among other things, used for calculating the dark matter relic density -- an measurable quantity -- given the supersymmetric neutralino, χ, as a dark matter candidate. Supersymmetric theories have many free parameters and we want to calculate the relic density for large areas of the parameter space. The results can then be compared with observations and to constrain the parameters. A faster DarkSUSY would allow for larger searches in the parameter space. We modified DarkSUSY using Nvidia's CUDA platform and wrote a program that, by using the GPU, calculates the χ + χ <-> W+ + W- contribution to the annihilation cross-section. Our initial try was only negligible faster than our non-CUDA program due to under-utilization of the GPU, but solving that the program was 47 times faster than the reference program. We also report on difficulties we faced, both solved and unsolved so the reader can make an informed decision on the worth of rewriting so that the heavy calculations in DarkSUSY use the GPU.
Vi har undersökt om man kan använda grafikkortet för att få mjukvarupaketet DarkSUSY snabbare. DarkSUSY används, bland annat, för att beräkna relikdensiteten av mörk materia -- en mätbar kvantitet -- användandes den supersymmetriska neutralinon, χ, som mörk materia-kandidat. Supersymmetriska teorier har många fria parametrar och vi vill beräkna relikdensiteten för stora områden av parameterrummet. Resultaten kan sedan jämföras med observationer för att begränsa parametrarna. Ett snabbare DarkSUSY skulle tillåta större sökningar i parameterrummet. Vi modifierade DarkSUSY med hjälp av Nvidias CUDA-platform och skrev ett program som, genom att använda grafikkortet, beräknar χ + χ <-> W+ + W- kanalens bidrag till annihilationstvärsnittet. Vårt första försök var bara försumbart snabbare än vårt icke-CUDA program på grund av underanvändning av grafikkortet. Men med det åtgärdat så var programmet 47 gånger snabbare än referensprogrammet. Vi rapporterar också de problem vi stött på, både de vi löste och de vi inte löste. Detta så att läsaren kan avgöra värdet av att omarbeta så att alla de beräkningsintensiva delarna av DarkSUSY använder grafikkortet.
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27

Strömberg, Eric. "Faster Optimal Design Calculations for Practical Applications." Thesis, Uppsala universitet, Institutionen för farmaceutisk biovetenskap, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-150802.

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PopED is a software developed by the Pharmacometrics Research Group at the Department of Pharmaceutical Biosiences, Uppsala University written mainly in MATLAB. It uses pharmacometric population models to describe the pharmacokinetics and pharmacodynamics of a drug and then estimates an optimal design of a trial for that drug. With optimization calculations in average taking a very long time, it was desirable to increase the calculation speed of the software by parallelizing the serial calculation script. The goal of this project was to investigate different methods of parallelization and implement the method which seemed the best for the circumstances.The parallelization was implemented in C/C++ by using Open MPI and tested on the UPPMAX Kalkyl High-Performance Computation Cluster. Some alterations were made in the original MATLAB script to adapt PopED to the new parallel code. The methods which where parallelized included the Random Search and the Line Search algorithms. The testing showed a significant performance increase, with effectiveness per active core rangingfrom 55% to 89% depending on model and number of evaluated designs.
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Prang, Peter Franz-Josef. "Regenerationsfähigkeit entorhino-hippocampaler Fasern in organotypischen Schnittkulturen." [S.l.] : [s.n.], 2002. http://www.freidok.uni-freiburg.de/volltexte/381.

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29

Weeraprajak, Issarest. "Faster Adaptive Network Based Fuzzy Inference System." Thesis, University of Canterbury. Mathematics and Statistics, 2007. http://hdl.handle.net/10092/1234.

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It has been shown by Roger Jang in his paper titled "Adaptive-network-based fuzzy inference systems" that the Adaptive Network based Fuzzy Inference System can model nonlinear functions, identify nonlinear components in a control system, and predict a chaotic time series. The system use hybrid-learning procedure which employs the back-propagation-type gradient descent algorithm and the least squares estimator to estimate parameters of the model. However the learning procedure has several shortcomings due to the fact that * There is a harmful and unforeseeable influence of the size of the partial derivative on the weight step in the back-propagation-type gradient descent algorithm. *In some cases the matrices in the least square estimator can be ill-conditioned. *Several estimators are known which dominate, or outperform, the least square estimator. Therefore this thesis develops a new system that overcomes the above problems, which is called the "Faster Adaptive Network Fuzzy Inference System" (FANFIS). The new system in this thesis is shown to significantly out perform the existing method in predicting a chaotic time series , modelling a three-input nonlinear function and identifying dynamical systems. We also use FANFIS to predict five major stock closing prices in New Zealand namely Air New Zealand "A" Ltd., Brierley Investments Ltd., Carter Holt Harvey Ltd., Lion Nathan Ltd. and Telecom Corporation of New Zealand Ltd. The result shows that the new system out performed other competing models and by using simple trading strategy, profitable forecasting is possible.
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30

Liu, Shih-Yuan. "Collaborative Team Evasion Against a Faster Pursuer." Thesis, University of California, Berkeley, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=3686396.

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In the past decade, the level of autonomy of unmanned vehicles has been rising rapidly from remote-controlled towards fully autonomous. Without human operators on board, teams of autonomous vehicles are the best candidates for high risk applications such as search and rescue after disasters and information gathering in hostile environments. For a team of autonomous vehicles to operate effectively in these scenarios, it must be able to respond promptly to environmental hazards and/or hostile entities. In this dissertation, a collaborative team evasion framework is proposed to maximize the survival time of a team of autonomous vehicles against a faster and more agile hostile agent. The proposed framework is based on an open-loop formulation of the single-pursuer-multiple-evader pursuit-evasion game that is conservative to the evaders and provides guarantees on team survival time in the worst-case scenario. An iterative open-loop approach that repeatedly solves the open-loop problem corresponding to the most current state of the game is developed to relax the conservatism of the open-loop formulation and enhance the survival time performance. Extensions to the framework make it possible to take into account the turning rate constraints of the evaders and uncertainties in the position of the pursuer. Numerical approximations are also proposed to reduced the required computation time. Through extensive simulations, the proposed framework is shown to produce reliable strategies for the evaders that result in significantly longer team survival time than previous work in the literature.

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31

Dai, Peng. "FASTER DYNAMIC PROGRAMMING FOR MARKOV DECISION PROCESSES." UKnowledge, 2007. http://uknowledge.uky.edu/gradschool_theses/428.

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Markov decision processes (MDPs) are a general framework used by Artificial Intelligence (AI) researchers to model decision theoretic planning problems. Solving real world MDPs has been a major and challenging research topic in the AI literature. This paper discusses two main groups of approaches in solving MDPs. The first group of approaches combines the strategies of heuristic search and dynamic programming to expedite the convergence process. The second makes use of graphical structures in MDPs to decrease the effort of classic dynamic programming algorithms. Two new algorithms proposed by the author, MBLAO* and TVI, are described here.
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32

Hallqvist, Joakim. "Faster Locking Differential Through Active Brake-Control." Thesis, Linköpings universitet, Fordonssystem, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-119423.

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When a vehicle with wheels aligned in pairs turn, the wheel traveling around the outside of the curve has to roll farther than the wheel on the inside. This means that some sort of device must must be used to allow the drive wheels to rotate at different speeds to prevent wear on the tires. This is usually a mechanical device where the input rotation controls the sum of the two output rotations, this is known as a differential. This solution however has some shortcomings, the biggest one is that the total amount of force that can be transferred between the tires and the road surface is limited by the tire with the least traction. In slippery conditions this can be a big problem since it only takes one wheel to lose traction in order to prevent the vehicle from accelerating. In this thesis a locking differential is used to overcome this shortcoming, this gives the driver the option to lock the shafts of the driving wheels together. This is done by pushing two cogwheels, one attached to each shaft, together. The aim of this thesis is to shorten the lock- and unlock-time of the locking differential by aligning the cogwheels using the service brakes and available sensors. The results were evaluated by implementing the software in a truck and doing test runs on Scanias test track. These tests showed that the system greatly improved both lock- and unlock-times but at cost of lower driver comfort. With additional work with some fine tuning of the system, the overall performance could probably be increased even more.
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Aggarwal, Charu C. (Charu Chandra). "Faster algorithms for some network flow problems." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/11031.

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Lee, Yin Tat. "Faster algorithms for convex and combinatorial optimization." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/104467.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Mathematics, 2016.
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 443-458).
In this thesis, we revisit three algorithmic techniques: sparsification, cutting and collapsing. We use them to obtain the following results on convex and combinatorial optimization: --Linear Programming: We obtain the first improvement to the running time for linear programming in 25 years. The convergence rate of this randomized algorithm nearly matches the universal barrier for interior point methods. As a corollary, we obtain the first ... time randomized algorithm for solving the maximum flow problem on directed graphs with m edges and n vertices. This improves upon the previous fastest running time of achieved over 15 years ago by Goldberg and Rao. --Maximum Flow Problem: We obtain one of the first almost-linear time randomized algorithms for approximating the maximum flow in undirected graphs. As a corollary, we improve the running time of a wide range of algorithms that use the computation of maximum flows as a subroutine. --Non-Smooth Convex Optimization: We obtain the first nearly-cubic time randomized algorithm for convex problems under the black box model. As a corollary, this implies a polynomially faster algorithm for three fundamental problems in computer science: submodular function minimization, matroid intersection, and semidefinite programming. --Graph Sparsification: We obtain the first almost-linear time randomized algorithm for spectrally approximating any graph by one with just a linear number of edges. This sparse graph approximately preserves all cut values of the original graph and is useful for solving a wide range of combinatorial problems. This algorithm improves all previous linear-sized constructions, which required at least quadratic time. --Numerical Linear Algebra: Multigrid is an efficient method for solving large-scale linear systems which arise from graphs in low dimensions. It has been used extensively for 30 years in scientific computing. Unlike the previous approaches that make assumptions on the graphs, we give the first generalization of the multigrid that provably solves Laplacian systems of any graphs in nearly-linear expected time.
by Yin Tat Lee.
Ph. D.
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35

Shi, Peiyang. "Faster Unsupervised Object Detection For Symbolic Representation." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-277852.

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Symbolic artificial intelligence has seen a wave of intense research in the late 20th century. More recently, the field of deep learning and deep reinforcement learning has been making large strides in terms of computer vision and robotic applications. Both fields have impressive accomplishments but are situated on two opposite ends of the spectrum in AI research. Mainstream deep learning relies on automatic feature extraction which often includes abstract features while symbolic AI often relies on handcrafting symbols and semantics. In this work, we introduce a deep learning algorithm for learning symbolic representation. The algorithm is bases on recent advances in un-supervised object detection, and we demonstrate that it ca be easily adapted for symbolic representation.  Our algorithm, FaSPAIR, is an adaption of the object detection algorithm SPAIR. We have made several changes to bridge the model to the symbolic representation needed for reinforcement learning and to improve training speed. Our results demonstrate the efficacy of using object detection for learning symbolic representation. We also demonstrate that FaSPAIR has a large boost in computation speed compared to the current state of the art algorithm SPAIR.
Under slutet av 1900-talet har forskning inom symbolisk artificiell intelligens ökat kraftigt. Områdena djupinlärning och djup förstärkningsinlärning har på senare tid gjort stora framsteg inom datorseende och robotapplikationer. Både områdena har gjort imponerande framsteg men finner sig i motsatta ändar av AI-forskningens spektrum. Mainstream djupinlärning bygger på automatisk extraktion utan vidare hänsyn till tolkningsbara symboler medan symbolisk AI ofta fokuserar på handgjorda symboler. I denna studie introducerar vi en djupinlärningsalgoritm för symbolrepresentationsinlärning. Algoritmen baseras på de senaste framstegen inom oövervakad objektdetektering och vi visar att den lätt kan anpassas för symbolisk representation. Vår algoritm, FaSPAIR, är en anpassning av algoritmen för objektdetektering, SPAIR. Vi har gjort flera förändringar för att kunna länka modellen till den symboliska representationen som behövs för förstärkningsinlärning samt för förbättring av träningshastigheten. Våra resultat visar verkan och effektiviteten av att använda objektdetektion för symbolisk representationsinlärning. Vi visar även att FaSPAIR ger stor förbättring i beräkningshastigheten jämfört med den toppmoderna algoritmen SPAIR.
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36

Alonso, Pedro. "Faster and More Resource-Efficient Intent Classification." Licentiate thesis, Luleå tekniska universitet, EISLAB, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-81178.

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Intent classification is known to be a complex problem in Natural Language Processing (NLP) research. This problem represents one of the stepping stones to obtain machines that can understand our language. Several different models recently appeared to tackle the problem. The solution has become reachable with deep learning models. However, they have not achieved the goal yet.Nevertheless, the energy and computational resources of these modern models (especially deep learning ones) are very high. The utilization of energy and computational resources should be kept at a minimum to deploy them on resource-constrained devices efficiently.Furthermore, these resource savings will help to minimize the environmental impact of NLP. This thesis considers two main questions.First, which deep learning model is optimal for intent classification?Which model can more accurately infer a written piece of text (here inference equals to hate-speech) in a short text environment. Second, can we make intent classification models to be simpler and more resource-efficient than deep learning?. Concerning the first question, the work here shows that intent classification in written language is still a complex problem for modern models.However, deep learning has shown successful results in every area it has been applied.The work here shows the optimal model that was used in short texts.The second question shows that we can achieve results similar to the deep learning models by more straightforward solutions.To show that, when combining classical machine learning models, pre-processing techniques, and a hyperdimensional computing approach. This thesis presents a research done for a more resource-efficient machine learning approach to intent classification. It does this by first showing a high baseline using tweets filled with hate-speech and one of the best deep learning models available now (RoBERTa, as an example). Next, by showing the steps taken to arrive at the final model with hyperdimensional computing, which minimizes the required resources.This model can help make intent classification faster and more resource-efficient by trading a few performance points to achieve such resource-saving.Here, a hyperdimensional computing model is proposed. The model is inspired by hyperdimensional computing and its called ``hyperembed,'' which shows the capabilities of the hyperdimensional computing paradigm.When considering resource-efficiency, the models proposed were tested on intent classification on short texts, tweets (for hate-speech where intents are to offend or not to), and questions posed to Chatbots. In summary, the work proposed here covers two aspects. First, the deep learning models have an advantage in performance when there are sufficient data. They, however, tend to fail when the amount of available data is not sufficient. In contrast to the deep learning models, the proposed models work well even on small datasets.Second, the deep learning models require substantial resources to train and run them while the models proposed here aim at trading off the computational resources spend to obtaining and running the model against the classification performance of the model.
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37

Mammitzsch, Jens. "Untersuchungen zum Einsatz von ultrahochmolekularen Polyethylenfasern in Seilen für die Fördertechnik." Doctoral thesis, Universitätsbibliothek Chemnitz, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-159603.

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Seile aus synthetischen Fasern gewinnen zunehmend an Bedeutung für fördertechnische Anwendungen. Wegen ihrer geringen Dichte und Biegesteifigkeit sowie den gleichzeitig mit Stahl vergleichbaren Zugfestigkeiten, haben sich Seile aus ultrahochmolekularen Polyethylenfasern (UHMW-PE) in vielen Anwendungen in der Seefahrt und im Offshore-Bereich durchgesetzt. Die grundsätzliche Eignung solcher Seile für technische Anwendungen, wie z.B. Kräne, Aufzüge, Windenanwendungen, wurde in wissenschaftlichen Studien bereits nachgewiesen. In der vorliegenden Arbeit werden hochfeste Polyethylenfasern verschiedener Hersteller daraufhin untersucht, in wie weit diese durch ihre Eigenschaftsprofile ebenfalls grundsätzlich für technische Anwendungen mit auftretenden Biegewechselbelastungen geeignet sind und welche Anwendungspotentiale sie bieten. Beginnend mit einem kurzen geschichtlichen Abriss über die Entwicklung von synthetischen Polymerfasern und den Einsatz der Fasern in Seilen für technische Anwendungen, sollen grundlegend die Herstellungsverfahren und Eigenschaften von Garnen aus ausgewählten UHMW Polyethylen verglichen werden. Im weiteren Verlauf werden Faserseile aus den gewählten Fasern hinsichtlich Zugfestigkeit, Biegewechselverhalten und Eignung zum Thermofixieren untersucht. Auftretende Effekte werden analysiert und auf die Eigenschaften der Fasern bzw. Garne zurückgeführt. Eine vergleichende Betrachtung der Materialkosten als Teil der gesamten Herstellungskosten der Seile bildet den Abschluss der Arbeit
This thesis covers investigations on the properties of ultrahigh-molecular-weight (UHMW) polyethylene fibers for use of manufacturing braided fiber ropes for conveyor and hoisting applications. The importance of synthetic fibres for conveying applications has increased during the last years. Due to the low density and bending stiffness at a strength that is comparable to steel, ropes made from high-strength UHMW polyethylene fibres have found their ways into several shipping and off-shore applications. The basic aptitude of UHMW polyethylene fibres to be used in applications like cranes, elevators and winch applications has already been proven in scientific works. Within this thesis, selected UHMW polyethylene fibres are investigated to determine how much their differing property profiles do influence their aptitude to be used in technical applications with cyclic bending loads and for which potentials for fields of application they might be appropriate. Starting with a short overview on the history of synthetic fibres and the use of such fibres in technical applications, manufacturing processes and properties of these fibres are to be compared. Further, fibre ropes, made from the selected fibres, are going to be investigated concerning their tensile strength, behaviour in cyclic bend-over-sheave tests and their aptitude to increase the strength by thermosetting. Occurring effects are going to be analysed and related to the properties of the yarns. A competitive view on the prices of the yarns regarding their portion of the total costs of rope manufacturing is finalising this work
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38

Castellani, Agnese. "Le fasce di Van Allen." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/18745/.

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Le fasce di Van Allen sono zone della magnetosfera, toroidali, variabili e influenzate direttamente dal vento solare. Le particelle al loro interno sono altamente energetiche e si muovono con un moto a spirale, avvolgendosi attorno alle linee di campo geomagnetico. Il loro studio è fondamentale per le nuove missioni spaziali, dal momento che le particelle hanno effetti sia sull'equipaggio della missione che sulla strumentazione.
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39

Fürst, Andreas. "Laserstrahlschneiden von Faser-Kunststoff-Verbunden." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-225030.

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Die Dissertation widmet sich dem Schneiden von Faser-Kunststoff-Verbunden mit einem Laserstrahl. Herausforderung ist dabei der thermisch und optisch inhomogene Aufbau dieser Werkstoffklasse. Die Untersuchungen erfolgten an technisch relevanten Werkstoffen, basierend auf Glasfasern und thermoplastischer Matrix sowie Kohlenstofffasern mit duroplastischer Matrix. Eine grundlegende Betrachtung zur Werkstoff-Laserstrahl-Wechselwirkung zeigte zunächst den Einfluss der jeweiligen Einzelwerkstoffe und deren Mischungsverhältnis auf die absorbierten Anteile von einfallender Laserstrahlung mit den Wellenlängen λ = 1,07 µm und λ = 10,6 µm. Besondere Beachtung wurde dem Ansatz der simultanen Bearbeitung der Werkstoffe mit Laserstrahlung beider Wellenlängen gewidmet. Zielstellung war, bei gleichen optischen Randbedingungen die gute Fokussierbarkeit der Strahlung mit der Wellenlänge λ = 1,07 µm auszunutzen, um hohe Intensitäten auf dem Werkstoff zu erzeugen. Gleichzeitig sollte die Strahlung mit der Wellenlänge λ = 10,6 µm genutzt werden, um hohe absorbierte Anteile der einfallenden Laserstrahlung, vorranging im Matrixwerkstoff zu erhalten. Bei Verwendung eines Remote-Bearbeitungssystems können die Wechselwirkungszeit zwischen Laserstrahlung und Werkstoff minimiert und so hohe Vorschubgeschwindigkeiten erzeugt werden. Mit dem Mischungsverhältnis der Laserleistungen der jeweiligen Strahlquellenanteile steht dem zukünftigen Anwender ein neuartiger Freiheitsgrad zur Lasermaterialbearbeitung zur Verfügung. Im Ergebnis dieser Arbeit wurde der Einfluss dieses Parameters auf die Schneidbarkeit der Werkstoffe dargestellt. Der Endanwender erhält so eine grundlegende Orientierung zum Schneidverhalten von Faser-Kunststoff-Verbunden in Abhängigkeit von der jeweiligen Wellenlänge sowie der Schnittorientierung gegenüber der Faserorientierung der Werkstoffe.
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40

Nilsson, Anders. "WebADmin : a faster way to administrate active directory." Thesis, University West, Department of Informatics and Mathematics, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-654.

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41

au, R. Doupe@murdoch edu, and Robert Gerard Doupe. "Selection for faster growing black bream Acanthopagrus butcheri." Murdoch University, 2004. http://wwwlib.murdoch.edu.au/adt/browse/view/adt-MU20040901.133809.

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In Australia, the widespread clearing of native vegetation has resulted in large areas of once-productive agricultural land being affected by rising saline groundwaters. There is considerable interest among farmers and rural landowners throughout Western Australia, in the possibilities that inland saline aquaculture may offer for a potentially productive use of land and water resources that can no longer support traditional agriculture. Black bream (Acanthopagrus butcheri) appear to be an ideal candidate for the developing saline aquaculture industry of inland Western Australia, however their current maximum growth rates are too slow for profitable production. The high productivity of modern breeds of terrestrial livestock species is primarily due to genetic improvement programs utilising selective breeding, and similar gains have also been made where they have been implemented for aquatic species. Before the growth rate of black bream can be genetically improved, however, it is necessary to estimate both the extent of genetic improvement required and the extent of genetic (co)variation in those growth traits which will be subject to, or affected by, selection. The aims of this study were to: (1) Determine the extent of genetic improvement in growth rate required for black bream to be considered as a profitable aquaculture species. (2) Estimate the potential for growth rate to be improved through heterosis when different black bream strains are crossbred. (3) Estimate the additive genetic variation for growth rate, which exists within populations of black bream. (4) Estimate the genetic (co)variation which exists between growth rate and other production traits. A partial budget analysis investigated whether enhanced growth rates of black bream would improve profitability and justify a genetic improvement program. It was conducted for two different fish production systems; a commercial operation that incurred more operating expenses due to costs associated with farm initiation (stand-alone farm model) and an existing farm that diversified into aquaculture using the saline water resources of established farm dams (integrated farm model). Sensitivity analyses indicated that a 33% increase in growth rate to at least 200g/annum would allow either production system to return a profit at a farm-gate price of AUS$6/kg whole fish, with fish survival rates of 98% for the stand-alone farm and 65% for the integrated farm model. These results provided a breeding objective, being an improvement in growth rate by at least 33%. A complete diallel cross of two black bream populations was used to estimate the comparative advantages that might be gained from straight-breeding and crossbreeding. At 90 days of age, the growth traits of standard length, total length and wet weight, varied significantly among all straight-bred and crossbred lines, and among half-sib groups within lines. Differences among half-sib groups explained 6.8% of the total variance in standard length, 8.3% in total length and 7.1% in wet weight, giving estimated heritabilities over all lines of 0.27 ± 0.11 for standard length, 0.33 ± 0.13 for total length and 0.28 ± 0.12 for wet weight. There was no evidence for heterosis in any traits when straight-bred and crossbred lines were compared, and phenotypic (rP = 0.95 – 0.98) and genetic (rG = 0.63 – 0.69) correlations were high among all growth traits. I used the estimated heritability for wet weight of 0.28 to optimise a factorial mating design from a single population, and to estimate the contribution of additive genetic, nonadditive genetic and maternal effects to variation in growth traits of black bream at 75, 130 and 180 days of age in the hatchery. Maternal genetic and environmental effects were greatest at 75 days of age, accounting for 9.1% of total phenotypic variance in wet weight, 11.4% of variance in standard length and 8.8% of variance in total length. At later ages maternal effects were much reduced, explaining 0.8 – 3.7% of phenotypic variance in growth traits. Additive genetic effects were greatest at 130 days of age, when they accounted for 17.4% of total phenotypic variance in wet weight, 21.4% of variance in standard length and 18.7% of variance in total length. Additive genetic effects were negligible (<1%) at 75 days of age and 4.8 – 5.5% of total phenotypic variance in growth traits at 180 days of age. Non-additive genetic effects (which also included common environmental effects due to families being raised in the same tank) explained 5.8 – 7.3% of total phenotypic variance in growth traits at 75 days of age, but were much smaller at later ages. Variable stocking densities among tanks up to 75 days significantly affected all growth trait measurements below 180 days of age. One of the most important of these traits is feed conversion efficiency. Feed conversion efficiency (FCE) is the effectiveness with which feed is converted to saleable fish product. Feed costs are a major input to aquaculture production systems and genetic changes in FCE may therefore have an important influence on profitability. FCE is usually expressed by a composite measure that combines feed intake and growth rate. The two most common measures are feed conversion ratio (feed intake/weight gain over a specified time interval) and its inverse, feed efficiency. Feed conversion ratio and feed efficiency are measures of gross FCE, because they do not distinguish between the separate energy requirements of growth and maintenance. There is abundant evidence of substantial genetic variation in FCE and its component traits in terrestrial livestock species and, although data are few, the same is likely for cultured fish species. The major problems with selecting from this variation to genetically improve FCE in fish species are: • It appears impractical to measure feed intake on individual fish, so that family mean data must be used. • We do not know the optimal time period over which to test fish for FCE. • We do not know the genetic correlations between FCE under apparent satiation or restricted intake conditions, or between FCE at different times in the production cycle. I measured the relationships between feed intake to apparent satiety and weight gain in replicate half-sib families of black bream at four times over a 56-day test period. After 42 days, I found significant additive genetic variance in both weight gain and feed intake, and a stabilisation in family group variation in both traits. This indicates that 42 days is the minimum test period over which to measure genetic variation for FCE in black bream. There were high, positive phenotypic (and probably genetic) correlations between weight gain and feed intake after 42 days. There was no detectable genetic variation for either feed efficiency (weight gain/feed intake), or residual feed intake, which is the difference between the actual feed intake of an individual and the intake predicted from its body weight and growth rate. I argue that selection for improved FCE might be better achieved not by using a composite measure, but by using a weighted selection index that accounts for the genetic covariance among weight gain, feed intake and other correlated traits.
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42

Doupe, Robert Gerard. "Selection for faster growing black bream Acanthopagrus butcheri." Doupe, Robert Gerard (2004) Selection for faster growing black bream Acanthopagrus butcheri. PhD thesis, Murdoch University, 2004. http://researchrepository.murdoch.edu.au/25/.

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Abstract:
In Australia, the widespread clearing of native vegetation has resulted in large areas of once-productive agricultural land being affected by rising saline groundwaters. There is considerable interest among farmers and rural landowners throughout Western Australia, in the possibilities that inland saline aquaculture may offer for a potentially productive use of land and water resources that can no longer support traditional agriculture. Black bream (Acanthopagrus butcheri) appear to be an ideal candidate for the developing saline aquaculture industry of inland Western Australia, however their current maximum growth rates are too slow for profitable production. The high productivity of modern breeds of terrestrial livestock species is primarily due to genetic improvement programs utilising selective breeding, and similar gains have also been made where they have been implemented for aquatic species. Before the growth rate of black bream can be genetically improved, however, it is necessary to estimate both the extent of genetic improvement required and the extent of genetic (co)variation in those growth traits which will be subject to, or affected by, selection. The aims of this study were to: (1) Determine the extent of genetic improvement in growth rate required for black bream to be considered as a profitable aquaculture species. (2) Estimate the potential for growth rate to be improved through heterosis when different black bream strains are crossbred. (3) Estimate the additive genetic variation for growth rate, which exists within populations of black bream. (4) Estimate the genetic (co)variation which exists between growth rate and other production traits. A partial budget analysis investigated whether enhanced growth rates of black bream would improve profitability and justify a genetic improvement program. It was conducted for two different fish production systems; a commercial operation that incurred more operating expenses due to costs associated with farm initiation (stand-alone farm model) and an existing farm that diversified into aquaculture using the saline water resources of established farm dams (integrated farm model). Sensitivity analyses indicated that a 33% increase in growth rate to at least 200g/annum would allow either production system to return a profit at a farm-gate price of AUS$6/kg whole fish, with fish survival rates of 98% for the stand-alone farm and 65% for the integrated farm model. These results provided a breeding objective, being an improvement in growth rate by at least 33%. A complete diallel cross of two black bream populations was used to estimate the comparative advantages that might be gained from straight-breeding and crossbreeding. At 90 days of age, the growth traits of standard length, total length and wet weight, varied significantly among all straight-bred and crossbred lines, and among half-sib groups within lines. Differences among half-sib groups explained 6.8% of the total variance in standard length, 8.3% in total length and 7.1% in wet weight, giving estimated heritabilities over all lines of 0.27 plus-minus 0.11 for standard length, 0.33 plus-minus 0.13 for total length and 0.28 plus-minus 0.12 for wet weight. There was no evidence for heterosis in any traits when straight-bred and crossbred lines were compared, and phenotypic (rP = 0.95 - 0.98) and genetic (rG = 0.63 - 0.69) correlations were high among all growth traits. I used the estimated heritability for wet weight of 0.28 to optimise a factorial mating design from a single population, and to estimate the contribution of additive genetic, nonadditive genetic and maternal effects to variation in growth traits of black bream at 75, 130 and 180 days of age in the hatchery. Maternal genetic and environmental effects were greatest at 75 days of age, accounting for 9.1% of total phenotypic variance in wet weight, 11.4% of variance in standard length and 8.8% of variance in total length. At later ages maternal effects were much reduced, explaining 0.8 - 3.7% of phenotypic variance in growth traits. Additive genetic effects were greatest at 130 days of age, when they accounted for 17.4% of total phenotypic variance in wet weight, 21.4% of variance in standard length and 18.7% of variance in total length. Additive genetic effects were negligible (<1%) at 75 days of age and 4.8 - 5.5% of total phenotypic variance in growth traits at 180 days of age. Non-additive genetic effects (which also included common environmental effects due to families being raised in the same tank) explained 5.8 - 7.3% of total phenotypic variance in growth traits at 75 days of age, but were much smaller at later ages. Variable stocking densities among tanks up to 75 days significantly affected all growth trait measurements below 180 days of age. One of the most important of these traits is feed conversion efficiency. Feed conversion efficiency (FCE) is the effectiveness with which feed is converted to saleable fish product. Feed costs are a major input to aquaculture production systems and genetic changes in FCE may therefore have an important influence on profitability. FCE is usually expressed by a composite measure that combines feed intake and growth rate. The two most common measures are feed conversion ratio (feed intake/weight gain over a specified time interval) and its inverse, feed efficiency. Feed conversion ratio and feed efficiency are measures of gross FCE, because they do not distinguish between the separate energy requirements of growth and maintenance. There is abundant evidence of substantial genetic variation in FCE and its component traits in terrestrial livestock species and, although data are few, the same is likely for cultured fish species. The major problems with selecting from this variation to genetically improve FCE in fish species are: * It appears impractical to measure feed intake on individual fish, so that family mean data must be used. * We do not know the optimal time period over which to test fish for FCE. * We do not know the genetic correlations between FCE under apparent satiation or restricted intake conditions, or between FCE at different times in the production cycle. I measured the relationships between feed intake to apparent satiety and weight gain in replicate half-sib families of black bream at four times over a 56-day test period. After 42 days, I found significant additive genetic variance in both weight gain and feed intake, and a stabilisation in family group variation in both traits. This indicates that 42 days is the minimum test period over which to measure genetic variation for FCE in black bream. There were high, positive phenotypic (and probably genetic) correlations between weight gain and feed intake after 42 days. There was no detectable genetic variation for either feed efficiency (weight gain/feed intake), or residual feed intake, which is the difference between the actual feed intake of an individual and the intake predicted from its body weight and growth rate. I argue that selection for improved FCE might be better achieved not by using a composite measure, but by using a weighted selection index that accounts for the genetic covariance among weight gain, feed intake and other correlated traits.
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43

Doupé, Robert G. "Selection for faster growing black bream Acanthopagrus butcheri /." Access via Murdoch University Digital Theses Project, 2004. http://wwwlib.murdoch.edu.au/adt/browse/view/adt-MU20040901.133809.

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44

Fergusson, Emma J. ""Going faster than speed" : Leigh Davis, 1983-1985." Thesis, University of Canterbury. English, 2003. http://hdl.handle.net/10092/7055.

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Abstract:
This thesis is concerned with Leigh Davis's literary projects of the mid-1980s: And magazine and Willy's Gazette. These projects sought to effect a fundamental change in New Zealand's literary culture through the introduction of critical theory. This programme for literary reform coincided with the initiation of the monetarist reforms of New Zealand's economy. Davis had a professional involvement with these reforms, as he worked in Treasury between 1980 and 1985. This thesis proposes to investigate whether or not a connection can be demonstrated between poststructuralism and neoliberal theory, using Davis as a test case. Chapter one situates this thesis in relation to the discourse about the political implications of poststructuralism, introducing the key critical figures to whom I appeal. This chapter goes on to address the historical situation of Davis's work, discussing the cultural and political environment in New Zealand during the early 1980s, and providing a detailed anaylsis of a Treasury briefing paper on which Davis worked. The chapter concludes by considering Davis's dual position in the political centre and on the aesthetic margins. Chapter two addresses Davis's critical writing in And, considering the influence of manifestos of the modernist avant-garde on his work, and his positioning of his own project in relation to poets Allen Curnow and Ian Wedde. Moving on to Davis's enthusiastic review of the poetry of Roger Horrocks, this chapter also considers the influence of the L=A=N=G=U=A=G=E movement on Davis's poetics. Closer examination of Davis's poetics in undertaken in chapter three, which considers the significance of speed and history in Willy's Gazette.
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45

Matheson, Troy. "Why does Australia grow faster than New Zealand?" Thesis, University of Canterbury. Department of Economics, 2002. http://hdl.handle.net/10092/4312.

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We analyse the divergence in productivity between Australia and New Zealand, with a special emphasis on quantifying the industry-level contributors to the divergence and on whether the countries have comparable growth processes. The Convergence Hypothesis is tested between industries and across countries. We find that two industries satisfy our definition of Conditional Convergence (Agriculture, Forestry and Fishing and Cultural and Recreational Services). Cointegration tests reveal more stochastic trends governing Australian productivity than in New Zealand. Decompositions of the divergence to the industry-level suggest large contributions from differences in labour growth across the two countries, and significant contributions from cross-country structural differences. Most of the industries add to the divergence, with particularly large contributions from differences across the Mining and Wholesale Trade industries. The evidence suggests that the growth processes of the two economies are fundamentally different, thereby questioning the relevance of comparisons between them.
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46

Kogel, Wendy E. "Faster Training of Neural Networks for Recommender Systems." Digital WPI, 2002. https://digitalcommons.wpi.edu/etd-theses/607.

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In this project we investigate the use of artificial neural networks(ANNs) as the core prediction function of a recommender system. In the past, research concerned with recommender systems that use ANNs have mainly concentrated on using collaborative-based information. We look at the effects of adding content-based information and how altering the topology of the network itself affects the accuracy of the recommendations generated. In particular, we investigate a mixture of experts topology. We create two expert clusters in the hidden layer of the ANN, one for content-based data and another for collaborative-based data. This greatly reduces the number of connections between the input and hidden layers. Our experimental evaluation shows that this new architecture produces the same accuracy of recommendation as the fully connected configuration with a large decrease in the amount of time it takes to train the network. This decrease in time is a great advantage because of the need for recommender systems to provide real time results to the user.
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47

Galvin, Timothy Matthew. "Faster streaming algorithms for low-rank matrix approximations." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/91810.

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Abstract:
Thesis: M. Eng., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2014.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 53-55).
Low-rank matrix approximations are used in a significant number of applications. We present new algorithms for generating such approximations in a streaming fashion that expand upon recently discovered matrix sketching techniques. We test our approaches on real and synthetic data to explore runtime and accuracy performance. We apply our algorithms to the technique of Latent Semantic Indexing on a widely studied data set. We find our algorithms provide strong empirical results.
by Timothy Matthew Galvin.
M. Eng.
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48

Rhee, Donguk. "Faster fully polynomial approximation schemes for Knapsack problems." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/98564.

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Thesis: S.M., Massachusetts Institute of Technology, Sloan School of Management, Operations Research Center, 2015.
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 61-62).
A fully polynomial time approximation scheme (FPTAS) is an algorithm that returns ... -optimal solution to a maximization problem of size n, which runs in polynomial time in both ... We develop faster FPTASs for several classes of knapsack problems. In this thesis, we will first survey the relevant literature in FPTASs for knapsack problems. We propose the use of floating point arithmetic rather than the use of geometric rounding in order to simplify analysis. Given a knapsack problem that yield an ... -optimal solution for disjoint subsets S and T of decision variables, we show how to attain ... -optimal solution for the knapsack problem for the set ... We use this procedure to speed up the run-time of FPTASs for: 1. The Integer Knapsack Problem, 2. The Unbounded Integer Knapsack Problem, 3. The Multiple-Choice Knapsack Problem, and, 4. The Nonlinear Integer Knapsack Problem, Using addition ideas, we develop a fast fully polynomial time randomized approximation scheme (FPTAS) for the 0-1 Knapsack Problem, which has the run-time of ...
by Donguk Rhee.
S.M.
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49

Silva, Filho José Grimaldo da. "Multiscale spectral residue for faster image object detection." reponame:Repositório Institucional da UFBA, 2013. http://www.repositorio.ufba.br/ri/handle/ri/13203.

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Accuracy in image object detection has been usually achieved at the expense of much computational load. Therefore a trade-o between detection performance and fast execution commonly represents the ultimate goal of an object detector in real life applications. Most images are composed of non-trivial amounts of background nformation, such as sky, ground and water. In this sense, using an object detector against a recurring background pattern can require a signi cant amount of the total processing time. To alleviate this problem, search space reduction methods can help focusing the detection procedure on more distinctive image regions. Among the several approaches for search space reduction, we explored saliency information to organize regions based on their probability of containing objects. Saliency detectors are capable of pinpointing regions which generate stronger visual stimuli based solely on information extracted from the image. The fact that saliency methods do not require prior training is an important bene t, which allows application of these techniques in a broad range of machine vision domains. We propose a novel method toward the goal of faster object detectors. The proposed method was grounded on a multi-scale spectral residue (MSR) analysis using saliency detection. For better search space reduction, our method enables ne control of search scale, more robustness to variations on saliency intensity along an object length and also a direct way to control the balance between search space reduction and false negatives caused by region selection. Compared to a regular sliding window search over the images, in our experiments, MSR was able to reduce by 75% (in average) the number of windows to be evaluated by an object detector while improving or at least maintaining detector ROC performance. The proposed method was thoroughly evaluated over a subset of LabelMe dataset (person images), improving detection performance in most cases. This evaluation was done comparing object detection performance against di erent object detectors, with and without MSR. Additionally, we also provide evaluation of how di erent object classes interact with MSR, which was done using Pascal VOC 2007 dataset. Finally, tests made showed that window selection performance of MSR has a good scalability with regard to image size. From the obtained data, our conclusion is that MSR can provide substantial bene ts to existing sliding window detectors.
Salvador
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50

Silva, Filho Jose Grimaldo da. "Multiscale Spectral Residue for Faster Image Object Detection." Escola Politécnica / Instituto de Matemática, 2013. http://repositorio.ufba.br/ri/handle/ri/21340.

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Accuracy in image object detection has been usually achieved at the expense of much computational load. Therefore a trade-o between detection performance and fast execution commonly represents the ultimate goal of an object detector in real life applications. Most images are composed of non-trivial amounts of background information, such as sky, ground and water. In this sense, using an object detector against a recurring background pattern can require a signi cant amount of the total processing time. To alleviate this problem, search space reduction methods can help focusing the detection procedure on more distinctive image regions.
Among the several approaches for search space reduction, we explored saliency information to organize regions based on their probability of containing objects. Saliency detectors are capable of pinpointing regions which generate stronger visual stimuli based solely on information extracted from the image. The fact that saliency methods do not require prior training is an important benefit, which allows application of these techniques in a broad range of machine vision domains. We propose a novel method toward the goal of faster object detectors. The proposed method was grounded on a multi-scale spectral residue (MSR) analysis using saliency detection. For better search space reduction, our method enables fine control of search scale, more robustness to variations on saliency intensity along an object length and also a direct way to control the balance between search space reduction and false negatives caused by region selection. Compared to a regular sliding window search over the images, in our experiments, MSR was able to reduce by 75% (in average) the number of windows to be evaluated by an object detector while improving or at least maintaining detector ROC performance. The proposed method was thoroughly evaluated over a subset of LabelMe dataset (person images), improving detection performance in most cases. This evaluation was done comparing object detection performance against different object detectors, with and without MSR. Additionally, we also provide evaluation of how different object classes interact with MSR, which was done using Pascal VOC 2007 dataset. Finally, tests made showed that window selection performance of MSR has a good scalability with regard to image size. From the obtained data, our conclusion is that MSR can provide substantial benefits to existing sliding window detectors
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