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Kas, Adem. "Validation of Power Dissipation of SerDes IPs." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-291216.
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Post-Silicon validation of a designed ASIC is an essential step in the product development process. During the validation process, all specifications of the ASICs have to be controlled in a lab environment. Serializer/Deserialiser(SerDes) blocks in an ASIC are used to perform high-speed serial data communication between distinct integrated circuits. The goal of the thesis is to validate the power consumption of SerDes IP blocks provided by different vendors in an ASIC. To validate power consumption, current and voltage values are read from power supply lines. Then these values are digitized and stored on a Raspberry Pi. To perform these operations, the initial firmware provided by vendors is improved to control SerDes operations, and software is developed to control the Raspberry Pi. Power measured operation is performed for every possible data rate for each SerDes modules. Power measurement is also performed for different temperature range in industry standards with the highest possible data rate for each SerDes IP block. As a final step, measured power consumption values are compared to vendors’ data.Validering av en designad ASIC efter kisel är ett viktigt steg i produktutvecklingsprocessen. Under valideringsprocessen måste alla specifikationer för ASIC kontrolleras i en laboratoriemiljö. Serializer / Deserialiser (SerDes) -block i en ASIC används för att utföra höghastighets seriell datakommunikation mellan distinkta integrerade kretsar. Målet med avhandlingen är att validera strömförbrukningen för SerDes IP-block som tillhandahålls av olika leverantörer i en ASIC. För att validera strömförbrukningen läses strömoch spänningsvärden från strömförsörjningsledningarna. Sedan digitaliseras dessa värden och lagras på en Raspberry Pi. För att utföra dessa operationer förbättras den inledande firmware som tillhandahålls av leverantörer för att styra SerDesoperationer och programvara utvecklas för att styra Raspberry Pi. Effektmätt operation utförs för varje möjlig datahastighet för varje SerDes-modul. Mätoperationer utförs också för olika temperaturintervall i branschstandarder med högsta möjliga datahastighet för varje SerDes IP-block. Som ett sista steg jämförs uppmätta energiförbrukningsvärden med leverantörens data.
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Rogers, Michael. "High-speed low-voltage line driver for SerDes applications." Thesis, Oxford Brookes University, 2009. https://radar.brookes.ac.uk/radar/items/d7f9d856-ae6d-4eab-bb7d-aa54376560d6/1/.
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The driving factor behind this research was to design & develop a line driver capable of meeting the demanding specifications of the next generation of SerDes devices. In this thesis various line driver topologies were analysed to identify a topology suited for a high-speed low-voltage operating environment. This thesis starts of by introducing a relatively new high-speed communication Device called SerDes. SerDes is used in wired chip-to-chip communications and operates by converting a parallel data stream in a serial data stream that can be then transmitted at a higher bit rate, existing SerDes devices operate up to 12.5Gbps. A matching SerDes device at the destination will then convert the serial data stream back into a parallel data stream to be read by the destination ASIC. SerDes typically uses a line driver with a differential output. Using a differential line driver increases the resilience to outside sources of noise and reduces the amount of EM radiation produced by transmission. The focus of this research is to design and develop a line driver that can operate at 40Gbps and can function with a power supply of less than IV. This demanding specification was decided to be an accurate representation of future requirements that a line driver in a SerDes device will have to conform to. A suitable line driver with a differential output was identified to meet the demanding specifications and was modified so that it can perfonn an equalisation technique called pre-distortion. Two variations of the new topology were outlined and a behavioural model was created for both using Matlab Simulink. The behavioural model for both variants proved the concept, however only one variant maintained its perfomance once the designs were implemented at transistor level in Cadence, using a 65nm CMOS technology provided by Texas Instruments. The final line driver design was then converted into a layout design, again using Cadence, and RC parasitics were extracted to perfom a post-layout simulation. The post layout simulation shows that the novel line driver can operate at 40Gbps with a power supply of 1 V - O.8V and has a power consumption of 4.54m W /Gbps. The Deterministic Jitter added by the line driver is 12.9ps.
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Müller, Markus Roman [Verfasser], and Ulrich [Akademischer Betreuer] Brüning. "Digital Centric Multi-Gigabit SerDes Design and Verification / Markus Roman Müller ; Betreuer: Ulrich Brüning." Heidelberg : Universitätsbibliothek Heidelberg, 2018. http://d-nb.info/1177691191/34.
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Manoni, Simone. "EPAC Multi-FPGA SerDes: Enabling Partitioning of the European Processor Accelerator on Multiple FPGAs." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2022.
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European Processor Initiative (EPI) è un progetto attualmente implementato nella seconda fase di un accordo
con la Commissione europea, il cui scopo è quello di progettare e attuare una tabella di marcia per una nuova famiglia di processori europei a basso consumo per l'extreme scale computing,
Big-Data, HPC e altre applicazioni emergenti. La prima fase di
EPI è iniziata nel dicembre 2018 ed è stata completata con successo nel novembre 2021, con la consegna dei primi 143 test chip (EPACs) per l'unione europea. Il bring-up dei test chip è avvenuto con successo e ha eseguito il suo primo
programma inviando i tradizionali saluti "Hello World!" in diverse lingue. Per eseguire tutte le necessarie procedure di prototipazione e test necessarie prima di inviare un chip in produzione, è necessario che l'EPAC sia emulato da
un dispositivo FPGA. Tuttavia, la dimensione di EPAC è troppo grande per implementare e prototipare il
progetto completo sulla maggior parte degli FPGA commerciali. Pertanto, fino ad ora, la prototipazione è stata
è stata effettuata disabilitando diverse parti del sistema una per una, in modo che il sistema ridotto potesse essere implementato in un singolo FPGA. Il lavoro presentato in questa tesi,
che è stato svolto all'interno di Semidynamics Technology Services per EPI, ha avuto come contributo la concezione del partizionamento EPAC su un sistema multi-FPGA, la
definizione dell'architettura e la progettazione di un modulo Serializzatore-Deserializzatore che permette il partizionamento EPAC del sistema multi-FPGA, al fine di realizzare un emulatore Full-Chip.
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Guin, Ujjwal. "DESIGN FOR BIT ERROR RATE ESTIMATION OF HIGH SPEED SERIAL LINKS." Master's thesis, Temple University Libraries, 2010. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/105599.
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Electrical EngineeringM.S.E.
High-speed serial links in modern communication systems often require the Bit-Error-Rate (BER) to be at the level of 10 −12 or lower. From the industry perspective, major drawbacks in high volume production test for the serial links with low BER are the excessive test time for comparing each captured bit for error detection and costly instrumentation. In this thesis, we focus on developing a novel BER estimation methodology and its implementation. We propose a novel BER estimation methodology and an effective self-test system, which not only eliminates the usage of expensive measuring instruments, but also significantly reduces the test time. In the proposed BER estimation, we show that the total jitter (TJ) spectral information of a test SerDes is successfully estimated from the known TJ distribution of a golden SerDes. We propose a novel BER estimation formula that incorporates not only the TJ spectral information of the serial data, but also the TJ spectral information of the recovered clock. Our proposed estimation formula enables efficient BER estimation without excessive test time, and its accuracy does not depend on the jitter present in the serial data stream of the SerDes. The experimental results demonstrate that the test time for the proposed BER estimation is in the order of seconds, which translates to the test time savings of more than hundred times compared to the traditional BER measurement for the same accuracy. To implement the proposed BER estimation methodology, we have developed a novel time-to-digital converter (TDC). This design effectively measures the delay between two signals and converts it into the digital format. Performance of the TDC has been evaluated and presented using ModelSim and SPICE simulation.
Temple University--Theses
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Gobbi, Vitaliano. "Progetto e sperimentazione di un convertitore seriale parallelo su FPGA per un flusso video LVDS a elevata frequenza generato da una telecamera stereo." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2012. http://amslaurea.unibo.it/3345/.
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Mahmoud, Ahmed Gamal Mohamed. "Boundary-scan for High-speed Serial Links." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018.
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The complexity of integrated circuit (IC) designs continues to increase with the constant advancement of process technology and decrease of feature size in a relentless effort to achieve better performance and reach new milestones. However, with the increasing density and complexity comes a higher probability of defects occurring as well as a higher impact of these defects on the overall performance. Testing, thus, proves essential in order to guarantee defect-free designs. Effective and efficient testing in terms of both cost and time becomes essential as well because of the continually rising cost of testing.
Abstract Serializer-deserializer (SerDes) devices or serial-link transceivers, which represent the device-under-test (DUT) in this thesis, are no different. Since the interface is the bottleneck in the performance of various systems, efforts continue to push for faster, smaller, and more power-efficient SerDes, leaving it with stringent specifications to meet. This leads to it being susceptible to the higher defect probability we just mentioned. As these are wireline transceivers, the robustness of the interconnects is especially critical. These defects that affect the interconnects are troublesome due to the fact that it is relatively easy for the fault to be masked which would indicate a non-existent fault within the design itself. In this thesis, we propose a test receiver that is capable of putting the interconnects under test in both DC-coupled and AC-coupled scenarios in compliance with the IEEE-1149.1 and IEEE-1149.6 standards.
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Borrami, Sina. "A control unit for a Digitizer System for the PANDA Electromagnetic Calorimeter." Thesis, Uppsala universitet, Institutionen för informationsteknologi, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-421560.
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PANDA is the next generation hadron physics detector under construction at the Facility for Antiproton and Ion Research (FAIR) in Darmstadt, Germany to accurately detect and parameterize particles with kinetic energies from 1MeV to 8GeV. PANDA is a 4π detector and due to its unique shape, all the readout electronic from ADC modules, power supplies, and a controller unit is housed in the liquid-cooled crates mounted inside the detector. Therefore, the readout electronics are exposed to a high level of magnetic field and radiation. The controller unit as the critical component of the digitization system with adequate radiation resiliency governs the crate. The control unit manages power supplies, monitors the radiation damages of each ADC modules, offer a mechanism to re-program the ADC module firmware, and finally features a redundant communication for the crate over fiber optics. The purpose of this thesis is to study and design the controller unit hardware that meets the specification of the PANDA experiment.
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Bidaj, Klodjan. "Modélisation du bruit de phase et de la gigue d'une PLL, pour les liens séries haut débit." Thesis, Bordeaux, 2016. http://www.theses.fr/2016BORD0355/document.
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La vitesse des liens séries haut débit (USB, SATA, PCI-express, etc.) a atteint les multi-gigabits par seconde, et continue à augmenter. Deux des principaux paramètres électriques utilisés pour caractériser les performances des SerDes sont la gigue transmis à un niveau de taux d’erreur donné et la capacité du récepteur à suivre la gigue à un taux d’erreur donné.Modéliser le bruit de phase des différents components du SerDes, et extraire la gigue temporelle pour la décomposer, aideraient les ingénieurs en conception de circuits à atteindre les meilleurs résultats pour les futures versions des SerDes. Générer des patterns de gigue synthétiques de bruits blancs ou colorés permettrait de mieux analyser les effets de la gigue dans le système pendant la phase de vérification.La boucle d’asservissement de phase est un des contributeurs de la gigue d’horloge aléatoire et déterministe à l’intérieur du système. Cette thèse présente une méthode pour modéliser la boucle d’asservissement de phase avec injection du bruit de phase et estimation de la gigue temporelle. Un modèle dans le domaine temporel en incluant les effets de non-linéarité de la boucle a été créé pour estimer cette gigue. Une nouvelle méthode pour générer des patterns synthétiques de gigue avec une distribution Gaussienne à partir de profils de bruit de phase coloré a été proposée.Les standards spécifient des budgets séparés de gigue aléatoire et déterministe. Pour décomposer la gigue de la sortie de la boucle d’asservissement de phase (ou la gigue généré par la méthode présentée), une nouvelle technique pour analyser et décomposer la gigue a été proposée. Les résultats de modélisation corrèlent bien avec les mesures et cette technique aidera les ingénieurs de conception à identifier et quantifier proprement les sources de la gigue ainsi que leurs impacts dans les systèmes SerDes.Nous avons développé une méthode, pour spécifier la boucle d’asservissement de phase en termes de bruit de phase. Cette méthode est applicable à tout standard (USB, SATA, PCIe, …) et définit les profils de bruits de4phases pour les différentes parties de la boucle d’asservissement de phase, pour s’assurer que les requis des standards sont satisfaits en termes de gigue. Ces modèles nous ont également permis de générer les spécifications de la PLL, pour des standards différentsBit rates of high speed serial links (USB, SATA, PCI-express, etc.) have reached the multi-gigabits per second, and continue to increase. Two of the major electrical parameters used to characterize SerDes Integrated Circuit performance are the transmitted jitter at a given bit error rate (BER) and the receiver capacity to track jitter at a given BER.Modeling the phase noise of the different SerDes components, extracting the time jitter and decomposing it, would help designers to achieve desired Figure of Merit (FoM) for future SerDes versions. Generating white and colored noise synthetic jitter patterns would allow to better analyze the effect of jitter in a system for design verification.The phase locked loop (PLL) is one of the contributors of clock random and periodic jitter inside the system. This thesis presents a method for modeling the PLL with phase noise injection and estimating the time domain jitter. A time domain model including PLL loop nonlinearities is created in order to estimate jitter. A novel method for generating Gaussian distribution synthetic jitter patterns from colored noise profiles is also proposed.The Standard Organizations specify random and deterministic jitter budgets. In order to decompose the PLL output jitter (or the generated jitter from the proposed method), a new technique for jitter analysis and decomposition is proposed. Modeling simulation results correlate well with measurements and this technique will help designers to properly identify and quantify the sources of deterministic jitter and their impact on the SerDes system.We have developed a method, for specifying PLLs in terms of Phase Noise. This method works for any standard (USB, SATA, PCIe, …), and defines Phase noise profiles of the different parts of the PLL, in order to be sure that the standard requirements are satisfied in terms of Jitter
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Muppalla, Ashwin K. "Ultra low power multi-gigabit digital CMOS modem technology for millimeter wave wireless systems." Thesis, Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/41084.
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The objective of this research is to present a low power modem technology for a high speed millimeter wave wireless system.
The first part of the research focuses on a robust ASIC design methodology. There are several aspects of the ASIC flow that require special attention such as logical synthesis, timing driven physical placement, Clock Tree Synthesis,
Static Timing Analysis, estimation and reduction of power consumption and LVS and DRC closure.
The latter part is dedicated to high speed baseband circuits such as Coherent and Non coherent demodulator which are critical components of a multi-gigabit wireless communication system. The demodulator operates at input data rates of multiple gigabits per second, which presents the challenge of designing the building blocks to operate at speeds of multiple GHz. The high speed complex multiplier is a major component of the non coherent demodulator. As part of the coherent demodulator the complex multiplier derotates the input sequence by multiplying with cosine and sine functions, Costas error calculator computes the phase error in the derotated input signal. The NCO (Numerically controlled Oscillator) is a look up table based system used to generate the cosine and sine functions, used by the derotator.The CIC filter is used to decimate the costas error signal as the loop bandwidth is significantly smaller compared to the sampling frequency. All these modules put together form the coherent demodulator which is an integral part of the wireless communication system. An implementation of Serdes is also presented which acts as an interface between the baseband modules and the RF front end.
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Kučera, Stanislav. "Vícekanálový převodník digitálního videosignálu HD-SDI." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-220346.
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This master’s thesis deals with the design of six channel SD, HD and 3G HD-SDI digital video signal converter to 10-Gigabit Ethernet. In the introductory part, the conception of designed device is formulated. The theoretical background is provided in four chapters, where main standards and design rules related to digital electronics’ design are analyzed. The emphasis is placed on signal integrity at high-speed interconnects. There mostly practical examples, calculations and simulations are utilized. The design part contains thorough description of main subsystems’ design, implementation of FPGA, SDI input channels and 10-Gigabit Ethernet PHY. In the final part, the first tests and measurements of the build prototype are summarized. As an example, the comparison of signal integrity simulation to measurement is provided.
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Chan, Shu Wun. "The furniture series – series one." Thesis, University of Iowa, 2012. https://ir.uiowa.edu/etd/2836.
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This is a research project to design a series of flat pack furniture that assemble without using any hardware and tools. The furniture series included a chair, a table, a coffee table, a side table, a bed and a sofa. Wheels were designed in the furniture to create mobility with the exception of the bed. Sustainable materials, such as Sustainable Forestry Initiative (SFI) certified plywood and High-density polyethylene (HDPE), had been used to produce the furniture. Rapid prototyping (RP) processes were being used to shorten the design process, such as Computer Aided-Design program (CAD) and Computer Modeling software to design; 3D Printer to create small scale model; Computer Numerical Control (CNC) to create full-scale prototype. Flat packaging has been used in the series to provide convenient to transport the furniture and the shipping cost.
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Serres, Aurélie Fregonese Marion. "Corrosion sous contrainte par l'iode du Zircaloy-4 cinétiques de fissuration et influence de l'irradiation sur l'amorçage /." Villeurbanne : Doc'INSA, 2009. http://docinsa.insa-lyon.fr/these/pont.php?id=serres.
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Chan, Shu Wun. "The furniture series - Series one Ii." Thesis, University of Iowa, 2013. https://ir.uiowa.edu/etd/4589.
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In my M.F.A. thesis, I am going to talk about the process of revising my
furniture series and designing new furniture in the series, which includes Chair ONE, Table 1⁄2, Bed ONE, and Sofa ONE. I am revising the area that didn't work very well.
In Chair ONE, I have revised the seating area to provide better stability. In Table 1⁄2, I have revised the support structure of the table. As I learned from the current structure, the tabletop start to bend as the tabletop dimension increased, as my table 1⁄2 has three different kinds of tabletop. I have added a second beam across the table legs to increase support to the tabletop.
In Bed ONE, I have added supporting structure for the bed frame. I noticed the plastic beam bent as weight added in a duration of time. A new supporting structure is needed to provide better stability of the structure.
In Sofa ONE, I have increased the dimension of the seating area. The plastic piece on the seating area isn't long enough to support the cushion. It doesn't provide a comfortable seating position for user. The only solution is to extending the seating structure. Also, a supporting structure added to better support for the seating area
Finally, I have designed a dining set for this series, which include a dining table and four chairs. The chair and the table are based on the design of my furniture series, but it will be a completely new set of furniture.
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Manheimer, Caroline. "Uniform Series." Digital Commons @ East Tennessee State University, 2008. https://dc.etsu.edu/etd/1923.
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This paper supports the exhibition entitled Uniform Series, on display in Slocumb Galleries at East Tennessee State University from March 17 to March 21, 2008. The pieces in the exhibit explore the processes of dyeing, printing, and stitching on cottons and sheer silks. The imagery contained in the pieces springs from the use of the artist's first grade school uniform which functions as a symbol of the images, memories, and themes suggested by the artist's life review process. The redemption of the past in order to arrive in the present mirrors the repeated processes involved in dyeing, discharging, and over-dyeing the cloth. The thesis discusses artistic influences and the integrating role of life review. The author explores the culture of the "art quilt" and its relationship to the artist's personal life.
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Qiang, Fu. "Bayesian multivariate time series models for forecasting European macroeconomic series." Thesis, University of Hull, 2000. http://hydra.hull.ac.uk/resources/hull:8068.
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Research on and debate about 'wise use' of explicitly Bayesian forecasting procedures has been widespread and often heated. This situation has come about partly in response to the dissatisfaction with the poor forecasting performance of conventional methods and partly in view of the development of computational capacity and macro-data availability. Experience with Bayesian econometric forecasting schemes is still rather limited, but it seems to be an attractive alternative to subjectively adjusted statistical models [see, for example, Phillips (1995a), Todd (1984) and West & Harrison (1989)]. It provides effective standards of forecasting performance and has demonstrated success in forecasting macroeconomic variables. Therefore, there would seem a case for seeking some additional insights into the important role of such methods in achieving objectives within the macroeconomics profession. The primary concerns of this study, motivated by the apparent deterioration of mainstream macroeconometric forecasts of the world economy in recent years [Wallis (1989), pp.34-43], are threefold. The first is to formalize a thorough, yet simple, methodological framework for empirical macroeconometric modelling in a Bayesian spirit. The second is to investigate whether improved forecasting accuracy is feasible within a European-based multicountry context. This is conducted with particular emphasis on the construction and implementation of Bayesian vector autoregressive (BVAR) models that incorporate both a priori and cointegration restrictions. The third is to extend the approach and apply it to the joint-modelling of system-wide interactions amongst national economies. The intention is to attempt to generate more accurate answers to a variety of practical questions about the future path towards a united Europe. The use of BVARs has advanced considerably. In particular, the value of joint-modelling with time-varying parameters and much more sophisticated prior distributions has been stressed in the econometric methodology literature. See e.g. Doan et al. (1984). Kadiyala and Karlsson (1993, 1997), Litterman (1986a), and Phillips (1995a, 1995b). Although trade-linked multicountry macroeconomic models may not be able to clarify all the structural and finer economic characteristics of each economy, they do provide a flexible and adaptable framework for analysis of global economic issues. In this thesis, the forecasting record for the main European countries is examined using the 'post mortem' of IMF, DECO and EEC sources. The formulation, estimation and selection of BVAR forecasting models, carried out using Microfit, MicroTSP, PcGive and RATS packages, are reported. Practical applications of BVAR models especially address the issues as to whether combinations of forecasts explicitly outperform the forecasts of a single model, and whether the recent failures of multicountry forecasts can be attributed to an increase in the 'internal volatility' of the world economic environment. See Artis and Holly (1992), and Barrell and Pain (1992, p.3). The research undertaken consolidates existing empirical and theoretical knowledge of BVAR modelling. It provides a unified coverage of economic forecasting applications and develops a common, effective and progressive methodology for the European economies. The empirical results reflect that in simulated 'out-of-sample' forecasting performances, the gains in forecast accuracy from imposing prior and long-run constraints are statistically significant, especially for small estimation sample sizes and long forecast horizons.
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Ould, Khaoua Sid-Ali Chassériaux Gérard. "Modélisation de l'aération naturelle et du microclimat des serres en verre de grande portée sous climat tempéré océanique." [S.l.] : [s.n.], 2006. http://tel.archives-ouvertes.fr/tel-00357023/fr.
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Rajan, Jebu Jacob. "Time series classification." Thesis, University of Cambridge, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.339538.
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Pope, Kenneth James. "Time series analysis." Thesis, University of Cambridge, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318445.
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Williamson, Matthew M. (Matthew Murray). "Series elastic actuators." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/36966.
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Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.Includes bibliographical references (p. 77-80).
by Matthew M. Williamson.
M.S.
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Beal, Lindsey Alissa. "The Venus series." Thesis, University of Iowa, 2011. https://ir.uiowa.edu/etd/924.
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The Venus Series is an attempt to recreate the power, mystery and primal beauty of the pre-historic Venus Figurines. I created my own Venus Figurines out of handmade paper incorporating history, contemporary culture and autobiography. I then photographed these sculptures with the wet-plate collodion process in order to re-create the beauty and drama of the original Venus Figurines.
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Smith, Peter Jeffry. "Estimation techniques for ARMA time series models and random geometric series." Thesis, Royal Holloway, University of London, 1988. http://repository.royalholloway.ac.uk/items/974d14d1-8a3b-4872-8eab-cd0599c8d6a8/1/.
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The thesis falls naturally into two sections. Firstly is a study of estimation techniques for ARMA models. Secondly is the work on random geometric series stemming from industrial collaboration with G.E.C. Telecommunications Laboratories. The unifying theory between these topics is discussed in the introduction. In the first section of the thesis the problem of estimation for ARMA models is considered. This is of long standing interest and the problem of maximum likelihood estimation is substantially solved. However the relationship between approximate and exact maximum likelihood estimation is less well known. The approximate procedures of A.M. Walker and E.J. Godolphin are considered in detail. Some results are produced which compare the two methods to each other and to various exact procedures. These comparisons are used to evaluate the success of some well known approximations. Finally a new approach to exact maximum likelihood estimation is developed which is simple to formulate and implement. This is used to study some numerical problems in estimation which occur near the boundary of the unit circle. The random geometric series considered in the second section have applications in both statistics and telecommunications. Specific examples of these series have been used to study infinite Bernoulli convolutions, intersymbol interference, error detection and many other subjects. In most applications it is the distribution of the series that is of interest. Initially the problem of calculating the distribution is considered in detail for a specific example concerning error detection. Several approaches are developed and compared to existing methods. It is shown that the most effective procedure is dependent on numerical properties of the series. Finally the new methods are extended to give two techniques, which can be used in all situations. These procedures are based on the semi-contraction mapping principles and the use of the Poisson summation formula to invert Fourier transforms.
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Rose, Rose. "Soma-series : somatic metaphors evidenced in a series of medical transactions?" Thesis, De Montfort University, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.398271.
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Yin, Jiang Ling. "Financial time series analysis." Thesis, University of Macau, 2011. http://umaclib3.umac.mo/record=b2492929.
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Forsberg, Mikael. "Amoebas and Laurent series /." Stockholm : Tekniska högsk, 1998. http://www.lib.kth.se/abs98/fors0518.pdf.
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Gore, Christopher Mark. "A time series classifier." Diss., Rolla, Mo. : Missouri University of Science and Technology, 2008. http://scholarsmine.mst.edu/thesis/pdf/Gore_09007dcc804e6461.pdf.
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Thesis (M.S.)--Missouri University of Science and Technology, 2008.Vita. The entire thesis text is included in file. Title from title screen of thesis/dissertation PDF file (viewed April 29, 2008) Includes bibliographical references (p. 53-55).
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Raskin, Samuel David. "Chiral Principal Series Categories." Thesis, Harvard University, 2014. http://dissertations.umi.com/gsas.harvard:11525.
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This thesis begins a study of principal series categories in geometric representation theory using the Beilinson-Drinfeld theory of chiral algebras. We study Whittaker objects in the unramified principal series category. This provides an alternative approach to the Arkhipov-Bezrukavnikov theory of Iwahori-Whittaker sheaves that exploits the geometry of the Feigin-Frenkel semi-infinite flag manifold.Mathematics
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balas, simona. "SERIES OF DISINTEGRATED MEMORIES." Master's thesis, University of Central Florida, 2007. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3461.
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Being absent from things or places for a period of time, we try to connect by revisiting our memories. There is always a vivid remembrance of certain objects or surroundings, but when we try to connect them, the truth in our mind deviates from the reality. The disintegration of the memories and the morphing of our imagination create a different reality in our minds that we begin to believe, considering that the truth becomes almost completely abstracted and obscured as time passes.M.F.A.
Department of Art
Arts and Humanities
Studio Art and the Computer MFA
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Lovett-Turner, Charles. "Resumming QCD perturbation series." Thesis, Durham University, 1995. http://etheses.dur.ac.uk/5375/.
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Since the advent of Quantum Field Theory (QFT) in the late 1940's, perturbation theory has become one of the most developed and successful means of extracting phenomenologically useful information from a QFT. In the ever- increasing enthusiasm for new phenomenological predictions, the mechanics of perturbation theory itself have often taken a back seat. It is in this light that this thesis aims to investigate some of the more fundamental properties of perturbation theory. The benefits of resumming perturbative series are highlighted by the explicit calculation of the three-jet rate in e+e- annihilation, resummed to all orders in leading and next-to-leading large logarithms. It is found that the result can be expressed simply in terms of exponentials and error functions. In general it is found that perturbative expansions in QED and QCD diverge at large orders. The nature of these divergences has been explored and found to come from two sources. The first are instanton singularities, which correspond to the combinatoric factors involved in counting Feynman diagrams at large orders. The second are renormalon singularities, which are closely linked to non-perturbative effects through the operator product expansion (OPE).By using Borel transform techniques, the singularity structure in the Borel plane for the QCD vacuum polarization is studied in detail. The renormalon singularity structure is as expected from OPE considerations. These results and existing exact large-A^/ results for the QCD Adler D-function and Deep Inelastic Scattering sum rules are used to resum to all orders the portion of the QCD perturbative coefficients which is leading in b, the first coefficient of the QCD beta-function. This part is expected asymptotically to dominate the coefficients in a large-Nj expansion. Resummed results are also obtained for the e+e- R-ratio and the r-lepton decay ratio. The renormalization scheme dependence of these resummed results is discussed in some detail.
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Boaghe, Otilia M. "Volterra series : modelling limitations." Thesis, University of Sheffield, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.327672.
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Dreisigmeyer, David W. "Volterra series fractional mechanics." Access citation, abstract and download form; downloadable file 1.54 Mb, 2004. http://wwwlib.umi.com/dissertations/fullcit/3131668.
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Winn, Laura L. "Grandma's pitcher : a series /." Online version of thesis, 1991. http://hdl.handle.net/1850/11611.
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Yin, Yong. "Outliers in Time Series /." Connect to resource, 1995. http://rave.ohiolink.edu/etdc/view.cgi?acc%5Fnum=osu1262638388.
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Ahsan, Ramoza. "Time Series Data Analytics." Digital WPI, 2019. https://digitalcommons.wpi.edu/etd-dissertations/529.
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Given the ubiquity of time series data, and the exponential growth of databases, there has recently been an explosion of interest in time series data mining. Finding similar trends and patterns among time series data is critical for many applications ranging from financial planning, weather forecasting, stock analysis to policy making. With time series being high-dimensional objects, detection of similar trends especially at the granularity of subsequences or among time series of different lengths and temporal misalignments incurs prohibitively high computation costs. Finding trends using non-metric correlation measures further compounds the complexity, as traditional pruning techniques cannot be directly applied. My dissertation addresses these challenges while meeting the need to achieve near real-time responsiveness. First, for retrieving exact similarity results using Lp-norm distances, we design a two-layered time series index for subsequence matching. Time series relationships are compactly organized in a directed acyclic graph embedded with similarity vectors capturing subsequence similarities. Powerful pruning strategies leveraging the graph structure greatly reduce the number of time series as well as subsequence comparisons, resulting in a several order of magnitude speed-up. Second, to support a rich diversity of correlation analytics operations, we compress time series into Euclidean-based clusters augmented by a compact overlay graph encoding correlation relationships. Such a framework supports a rich variety of operations including retrieving positive or negative correlations, self correlations and finding groups of correlated sequences. Third, to support flexible similarity specification using computationally expensive warped distance like Dynamic Time Warping we design data reduction strategies leveraging the inexpensive Euclidean distance with subsequent time warped matching on the reduced data. This facilitates the comparison of sequences of different lengths and with flexible alignment still within a few seconds of response time. Comprehensive experimental studies using real-world and synthetic datasets demonstrate the efficiency, effectiveness and quality of the results achieved by our proposed techniques as compared to the state-of-the-art methods.
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NETO, ANSELMO CHAVES. "BOOTSTRAP IN TIME SERIES." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1991. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=8324@1.
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O bootstrap de B. Efron, que não poderia ser imaginado sem
os computadores de hoje, pode resolver vários problemas
livre da suposição de Gaussianidade para os dados.
Este trabalho tem o objetivo de apresentar essa técnica
computacionalmente intensiva no contexto de Séries
temporais - Metodologia Box and Jenkins. Como se sabe essa
Metodologia possui alguns resultados assintóticos. Então,
na fase da identificação da estrutura do modelo, pode
apresentar problemas em regiões do espaço paramétrico aqui
determinadas,. O bootstrap é proposto como opção e um
estudo de simulação, comparativo, é apresentado. Constrói-
se a distribuição bootstrap da autocorrelação e
autocorrelação parcial, amostrais, e ainda a distribuição
bootstrap do estimador de MQNL dos coeficientes de modelos
ARMA (p, q). consequentemente, fica disponível medida não-
paramétrica da precisão da estimativa. O estudo de
simulação que aborda o estimador de MQNL dos coeficientes
enfoca, basicamente, a região de fronteira da
estacionariedade e inversibilidade.The bootstrap of B. Efron, what should not be imagined without fast andcheaper computation, can solve several problems free from assumption that the data conform to a bell-shaped curve. This work has the aim to present this computer-intensive technics in the context of Time Series - Box and Jenkins´s Methodology. As we know this methodology own some asymptotic results. Then in the identification stage of the structure of the model it may present some troubles on regions of the parametric space, as we show later on the bootstrap is proposed as an aption and a comparative simulation study is pointed out. We build up the bootstrap distribution of the sample autocorrelation and sample partial autocorrelation, and yet a bootstrap distribution to the non-linear LS estimator of the coefficients to the ARMA (p,q) model. As a consequence we get the non- parametric measure of the accuracy of the estimates. The study of simulation wich takes into account the non-linear LS estimato to the coefficients, actually focalize the borden of the stationarity and invertibility region.
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AGUIAR, JOSE LUIZ DO NASCIMENTO DE. "TIME SERIES SYMILARITY MEASURES." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2016. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=27789@1.
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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIROCOORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
PROGRAMA DE EXCELENCIA ACADEMICA
Atualmente, uma tarefa muito importante na mineração de dados é compreender como extrair os dados mais informativos dentre um número muito grande de dados. Uma vez que todos os campos de conhecimento apresentam uma grande quantidade de dados que precisam ser reduzidas até as informações mais representativas, a abordagem das séries temporais é definitivamente um método muito forte para representar e extrair estas informações. No entanto nós precisamos ter uma ferramenta apropriada para inferir os dados mais significativos destas séries temporais, e para nos ajudar, podemos utilizar alguns métodos de medida de similaridade para saber o grau de igualdade entre duas séries temporais, e nesta pesquisa nós vamos realizar um estudo utilizando alguns métodos de similaridade baseados em medidas de distância e aplicar estes métodos em alguns algoritmos de clusterização para fazer uma avaliação de se existe uma combinação (método de similaridade baseado em distância / algoritmo de clusterização) que apresenta uma performance melhor em relação a todos os outros utilizados neste estudo, ou se existe um método de similaridade baseado em distância que mostra um desempenho melhor que os demais.
Nowadays a very important task in data mining is to understand how to collect the most informative data in a very amount of data. Once every single field of knowledge have lots of data to summarize in the most representative information, the time series approach is definitely a very strong way to represent and collect this information from it (12, 22). On other hand we need to have an appropriate tool to extract the most significant data from this time series. To help us we can use some similarity methods to know how similar is one time series from another In this work we will perform a research using some distance-based similarity methods and apply it in some clustering algorithms to do an assessment to see if there is a combination (distance-based similarity methods / clustering algorithm) that present a better performance in relation with all the others used in this work or if there exists one distancebased similarity method that shows a better performance between the others.
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Janko, Balazs. "Dual drive series actuator." Thesis, University of Reading, 2015. http://centaur.reading.ac.uk/41865/.
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Industrial robotic manipulators can be found in most factories today. Their tasks are accomplished through actively moving, placing and assembling parts. This movement is facilitated by actuators that apply a torque in response to a command signal. The presence of friction and possibly backlash have instigated the development of sophisticated compensation and control methods in order to achieve the desired performance may that be accurate motion tracking, fast movement or in fact contact with the environment. This thesis presents a dual drive actuator design that is capable of physically linearising friction and hence eliminating the need for complex compensation algorithms. A number of mathematical models are derived that allow for the simulation of the actuator dynamics. The actuator may be constructed using geared dc motors, in which case the benefits of torque magnification is retained whilst the increased non-linear friction effects are also linearised. An additional benefit of the actuator is the high quality, low latency output position signal provided by the differencing of the two drive positions. Due to this and the linearised nature of friction, the actuator is well suited for low velocity, stop-start applications, micro-manipulation and even in hard-contact tasks. There are, however, disadvantages to its design. When idle, the device uses power whilst many other, single drive actuators do not. Also the complexity of the models mean that parameterisation is difficult. Management of start-up conditions still pose a challenge.
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Klinka, Karel. "Scientia silvica extension series." Forest Sciences Department, University of British Columbia, 2001. http://hdl.handle.net/2429/712.
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Scientia Silvica extension series was started in 1997 by Karel Klinka, a silvics professor at the University of British Columbia. He saw the need for a friendly way of distributing current research results to the forestry community. Each extension pamphlet represents a 2-4 page summary of research findings in the field of forest ecology. Topics range from humus form and ecosystem classification to forest productivity, regeneration, stand structure, soil nutrient regimes, coarse woody debris, and plant diversity. Included in each summary is a reference to the more technical original report or scientific paper and contact information for those who wish further information. Also included in the series are several full colour comprehensive reports on ecosystem classification. All pamphlets and reports are in Adobe Acrobat (PDF) format for on-screen viewing or printing. Forest Renewal British Columbia provided the funding for this version of Scientia Silvica extension series.
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Grubb, Howard John. "Multivariate time series modelling." Thesis, University of Bath, 1990. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.280803.
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Hudnell, William Jason. "A Series of Humiliations." Bowling Green State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1364826168.
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Trapp, Elizabeth J. "Cy Twombly's 'Ferragosto' Series." Ohio University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1276609006.
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Harney, Sara. "Catherine Opie's Domestic Series." VCU Scholars Compass, 2013. http://scholarscompass.vcu.edu/etd/471.
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American photographer Catherine Opie combines portraiture and documentary photography in her photographic series titled Domestic. At the center of this series lies the idea of community and the question of how community is constructed, a theme which unites Opie’s seemingly disparate bodies of work. Domestic depicts lesbians from across the United States in scenes of domesticity, living as couples, families, and housemates. Using formal portrait conventions to aestheticize the images, Opie photographed her subjects in and around their actual homes to create images that are documentary in essence. The series works to represent the lesbian community, which Opie felt had been underrepresented in American fine art photography, as well as present an alternative to the heteronormative view of domestic life in America.
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Fletcher, Allan John. "Who serves the survey?" Thesis, University of British Columbia, 2007. http://hdl.handle.net/2429/30868.
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Who Serves the Survey? is an intimate contemplation on the art history survey. In it, I
examine art history's flagship books and courses through their capacity to structure knowledge.
Fastening first on what, borrowing from Foucault, might instructively be termed the "art-function"
and the "story-function", I cogitate on the capacity of each ("serving under" and
"serving up" the survey) to constrict, constrain and contain conceptions of vision, visualization,
visual representation and visual comprehension. From there, I delve into the beginnings of the
modern art history survey and probe a number of points where it (the survey) both produces and
is, in turn, produced by the national, the archival, the financial, the social, the pedagogical, the
professional/professorial and (tangentially) the psychological. The last section is analytical and
prescriptive in that it poses questions inspired by the advent of visual culture/visual studies as an
alternative and an intervention. Key among these, is the vital theoretical and pedagogical query:
How might visual material be introduced and studied otherwise? In my judgment, visual cultural
studies, growing out of two mutually influential tendencies in Britain: critical art history and
cultural studies, provides the best option for reconceiving the study and teaching of visual
representations. It has two distinct advantages. Unlike the comparatively rigid methodology of
art historical surveys, visual studies refuses to impose a predetermined method or system,
choosing instead, to affirm the inquiry process itself by allowing the researcher/bricoleur to track
down, cook up and cobble together whatever methodologies fit the task at hand.Education, Faculty of
Curriculum and Pedagogy (EDCP), Department of
Graduate
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Rivera, Pablo Marshall. "Analysis of a cross-section of time series using structural time series models." Thesis, London School of Economics and Political Science (University of London), 1990. http://etheses.lse.ac.uk/13/.
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This study deals with multivariate structural time series models, and in particular, with the analysis and modelling of cross-sections of time series. In this context, no cause and effect relationships are assumed between the time series, although they are subject to the same overall environment. The main motivations in the analysis of cross-sections of time series are (i) the gains in efficiency in the estimation of the irregular, trend and seasonal components; and (ii) the analysis of models with common effects. The study contains essentially two parts. The first one considers models with a general specification for the correlation of the irregular, trend and seasonal components across the time series. Four structural time series models are presented, and the estimation of the components of the time series, as well as the estimation of the parameters which define this components, is discussed. The second part of the study deals with dynamic error components models where the irregular, trend and seasonal components are generated by common, as well as individual, effects. The extension to models for multivariate observations of cross-sections is also considered. Several applications of the methods studied are presented. Particularly relevant is an econometric study of the demand for energy in the U. K.
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Lemos, de Morais Alice. "A class of generalized beta distributions, Pareto power series and Weibull power series." Universidade Federal de Pernambuco, 2009. https://repositorio.ufpe.br/handle/123456789/6088.
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Previous issue date: 2009Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Nesta dissertação trabalhamos com três classes de distribuições de probabilidade, sendo uma já conhecida na literatura, a Classe de Distribuições Generalizadas Beta (Beta-G) e duas outras novas classes introduzidas nesta tese, baseadas na composição das distribuições Pareto e Weibull com a classe de distribuições discretas power series. Fazemos uma revisão geral da classe Beta-G e introduzimos um caso especial, a distribuição beta logística generalizada do tipo IV (BGL(IV)). Introduzimos distribuições relacionadas `a BG L(IV) que tamb´em pertencem `a classe Beta-G, como a beta-beta prime e a beta-F. Introduzimos a classe Pareto power series (PPS), que ´e uma mistura de distribui¸c oes Pareto com pesos definidos pela distribui¸c ao power series, e apresentamos algumas de suas propriedades. Introduzimos a classe Weibull power series (WPS), cujo processo de constru¸c ao ´e similar ao da classe PPS. Apresentamos algumas de suas propriedades e aplica¸c ao a um banco de dados reais. Distribui¸c oes nesta classe t em aplica¸c ao interessante a dados de tempo de vida devido `a variedade de formas da fun¸c ao de risco. Para as classes PPS e WPS, fizemos uma simula ¸c ao para avaliar m´etodos de sele¸c ao de modelo. A distribui¸c ao pareto ´e um caso especial limite da distribui¸c ao PPS, assim como a distribui¸c ao Weibull ´e um caso especial limite da distribui¸c ao WPS.
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Lindroth, Henriksson Amelia. "Unsupervised Anomaly Detection on Time Series Data: An Implementation on Electricity Consumption Series." Thesis, KTH, Matematisk statistik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-301731.
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Digitization of the energy industry, introduction of smart grids and increasing regulation of electricity consumption metering have resulted in vast amounts of electricity data. This data presents a unique opportunity to understand the electricity usage and to make it more efficient, reducing electricity consumption and carbon emissions. An important initial step in analyzing the data is to identify anomalies. In this thesis the problem of anomaly detection in electricity consumption series is addressed using four machine learning methods: density based spatial clustering for applications with noise (DBSCAN), local outlier factor (LOF), isolation forest (iForest) and one-class support vector machine (OC-SVM). In order to evaluate the methods synthetic anomalies were introduced to the electricity consumption series and the methods were then evaluated for the two anomaly types point anomaly and collective anomaly. In addition to electricity consumption data, features describing the prior consumption, outdoor temperature and date-time properties were included in the models. Results indicate that the addition of the temperature feature and the lag features generally impaired anomaly detection performance, while the inclusion of date-time features improved it. Of the four methods, OC-SVM was found to perform the best at detecting point anomalies, while LOF performed the best at detecting collective anomalies. In an attempt to improve the models' detection power the electricity consumption series were de-trended and de-seasonalized and the same experiments were carried out. The models did not perform better on the decomposed series than on the non-decomposed.Digitaliseringen av elbranschen, införandet av smarta nät samt ökad reglering av elmätning har resulterat i stora mängder eldata. Denna data skapar en unik möjlighet att analysera och förstå fastigheters elförbrukning för att kunna effektivisera den. Ett viktigt inledande steg i analysen av denna data är att identifiera möjliga anomalier. I denna uppsats testas fyra olika maskininlärningsmetoder för detektering av anomalier i elförbrukningsserier: densitetsbaserad spatiell klustring för applikationer med brus (DBSCAN), lokal avvikelse-faktor (LOF), isoleringsskog (iForest) och en-klass stödvektormaskin (OC-SVM). För att kunna utvärdera metoderna infördes syntetiska anomalier i elförbrukningsserierna och de fyra metoderna utvärderades därefter för de två anomalityperna punktanomali och gruppanomali. Utöver elförbrukningsdatan inkluderades även variabler som beskriver tidigare elförbrukning, utomhustemperatur och tidsegenskaper i modellerna. Resultaten tyder på att tillägget av temperaturvariabeln och lag-variablerna i allmänhet försämrade modellernas prestanda, medan införandet av tidsvariablerna förbättrade den. Av de fyra metoderna visade sig OC-SVM vara bäst på att detektera punktanomalier medan LOF var bäst på att detektera gruppanomalier. I ett försök att förbättra modellernas detekteringsförmåga utfördes samma experiment efter att elförbrukningsserierna trend- och säsongsrensats. Modellerna presterade inte bättre på de rensade serierna än på de icke-rensade.
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Tolö, Sara, and Matilda Wallén. "»I have work, and then I have a dinner thing. And then I am busy, trying to become who I am« : En kvalitativ studie om tv-seriers roll i identitesskapande med fokus på Hannah i Girls." Thesis, Linnéuniversitetet, Institutionen för medier och journalistik (MJ), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-52889.
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Women in visual media are generally underrepresented and stereotypically portrayed. It is a very undifferentiated image, that few women can actually identify with. Norm-breaking characters can have an essential part and a positive influence on humans identity formation, research shows. The purpose of this study is to examine eight women’s stories about how television shows had an impact on their identity formation, primarily focusing on Hannah from the very popular tv-series Girls. Hannah has been described as a plain and slightly overweight heroine, not suited for modern television. The study is built on a qualitative science-method through semi-structured interviews, with subjective stories as focal point. The selection of interviewees identify themselves as women and have seen Girls. The study shows that Hannah works as a role model by inspiring the interviewees to acknowledge and accept their self-view, in addition to increasing their bravery and place amongst other people. Thenceforth, they felt that there was a small representation of strong female characters on modern television and saw a necessity for Hannah in popular culture.
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Fessant, Françoise. "Prediction des series temporelles par reseaux de neurones artificiels : application aux series temporelles ionospheriques." Rennes 1, 1995. http://www.theses.fr/1995REN10103.
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Dans cette these nous nous interessons a la prediction des series temporelles par les reseaux de neurnes artificiels et plus particulierement a la prediction des series temporelles ionospheriques (qui sont reliees a la serie des taches solaires). Les indices ionospheriques sont utilises par le cnet pour etablir des previsions de propagation ionospheriques. Les modeles neuronaux que nous proposons sont tous bases sur les reseaux de neurones a couches entraines par un mecanisme d'apprentissage supervise: la retropropagation du gradient de l'erreur. Nous cherchons a ameliorer la prevision obtenue par un perceptron multicouches simple a une couche cachee. Nous avons montre qu'il faut exploiter plusieurs sources d'informations a l'entree du reseau multicouches (informations provenant d'autres series temporelles dans un cadre multivarie ou des indications sur la tendance, obtenues en calculant de nouvelles donnees). Nous avons egalement obtenu de bons resultats de previsions a partir d'architectures plus complexes: reseaux a delais et reseaux partiellement recurrents qui tiennent compte de la dimension temporelle des donnees, mais egalement a partir d'architectures modulaires dans lesquelles nous avons introduit une information de nature temporelle: chacun des modules a une fenetre temporelle differente en entree. L'approche envisagee est experimentale, cependant nous cherchons a respecter au mieux les theories reliees au probleme de la prediction ainsi que celles reliees aux reseaux de neurones artificiels
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Gallo, Eric Michael. "Development of Series Mode Control of a Parallel-Series Plug-In Hybrid Electric Vehicle." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1407247079.
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Maletti, Andreas. "Composition of Tree Series Transformations." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-99209.
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Tree series transformations computed by bottom-up and top-down tree series transducers are called bottom-up and top-down tree series transformations, respectively. (Functional) compositions of such transformations are investigated. It turns out that the class of bottomup tree series transformations over a commutative and complete semiring is closed under left-composition with linear bottom-up tree series transformations and right-composition with boolean deterministic bottom-up tree series transformations. Moreover, it is shown that the class of top-down tree series transformations over a commutative and complete semiring is closed under right-composition with linear, nondeleting top-down tree series transformations. Finally, the composition of a boolean, deterministic, total top-down tree series transformation with a linear top-down tree series transformation is shown to be a top-down tree series transformation.