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Zhu, Jianwei. "Modular pricing of options : an application of Fourier analysis /." Berlin [u.a.] : Springer, 2000. http://www.loc.gov/catdir/enhancements/fy0816/00063584-d.html.
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Shah, Nishi. "Failure Analysis of Modular Hip Implant." OpenSIUC, 2012. https://opensiuc.lib.siu.edu/theses/974.
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Biomaterials is a systematically, pharmacologically inert substance designed for implantation within or incorporation with a living system. The ultimate goal of biomaterials is to restore function of living tissues and organs of the body. Chemical stability, mechanical behavior and biocompatibility in body fluids and tissues are basic requirements for successful application of implant materials in hip replacements. The field of biomaterials has become a vital area, as these materials can enhance the quality and longevity of human life and the science and technology associated with this field has now led to multi-million dollar business. The thesis focuses mainly on fractured analysis of retrieved titanium-alloy modular hip implants, even though there exists biomaterials made up of ceramics, polymers and composite materials As it is well known that a good biomaterial should possess the fundamental properties such as better mechanical and biological compatibility and enhanced wear and corrosion resistance in biological environment. The primary purpose of this thesis was to identify the reasons which lead to fracture of implant retrieved from 60years old male implanted for a 16 month time. The retrieved Implant was sterilized for two hours to overcome bio hazardous condition. The fractured area of implant sleeve and stem was cut with help of machine ISOMET BUEHLER 4000 consisting of diamond saw. The cut sample was placed into physiological solution (0.9% NaCl in H2O), and was maintained at room temperature over night. Samples were then thoroughly brushed with help of toothpaste and tooth brush to get rid of tissue deposits and blood stains so as to get clear picture under SEM. Fractures sample was than observed under Scanning Electron Microscope and a detailed study revealed fretting corrosion and fatigue failure were main cause of implant failure. After examining under SEM, sample was than prepared to be polished by covering it with epoxy and using BUEHLER polishing machine and sand paper from 240-1200 grid and finally a micro cloth to smoothen the surface. After sample being polished, it was immersed in Kroll solution for etching and observing under microscope to figure micro-structural changes.
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Rousu, Linnea. "Modular Forms and Related Topics." Thesis, Uppsala universitet, Analys och sannolikhetsteori, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-446773.
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Kent, Zachary A. "P-adic analysis and mock modular forms." Thesis, University of Hawaii at Manoa, 2011. http://hdl.handle.net/10125/25934.
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A mock modular form f+ is the holomorphic part of a harmonic Maass form f. The non-holomorphic part of f is a period integral of a cusp form g, which we call the shadow of f+. The study of mock modular forms and mock theta functions is one of the most active areas in number theory with important works by Bringmann, Ono, Zagier, Zwegers, among many others. The theory has many wide-ranging applications: additive number theory, elliptic curves, mathematical physics, representation theory, and many others.
We consider arithmetic properties of mock modular forms in three different settings: zeros of a certain family of modular forms, coupling the Fourier coefficients of mock modular forms and their shadows, and critical values of modular L-functions.
For a prime p > 3, we consider j-zeros of a certain family of modular forms called Eisenstein series. When the weight of the Eisenstein series is p - 1, the j-zeros are j-invariants of elliptic curves with supersingular reduction modulo p. We lift these j-zeros to a p-adic field, and show that when the weights of two Eisenstein series are p-adically close, then there are j-zeros of both series that are p-adically close.
A direct method for relating the coefficients of shadows and mock modular forms is not known. This is considered to be among the first of Ono's Fundamental Problems for mock modular forms. The fact that a shadow can be cast by infinitely many mock modular forms, and the expected transcendence of generic mock modular forms pose serious obstructions to this problem. We solve these problems when the shadow is an integer weight cusp form. Our solution is p-adic, and it relies on our definition of an algebraic regularized mock modular form.
We use mock modular forms to compute generating functions for the critical values of modular L-functions. To obtain this result we derive an Eichler-Shimura theory for weakly holomorphic modular forms and mock modular forms. This includes an "Eichler-Shimura isomorphism", a "multiplicity two" Hecke theory, a correspondence between mock modular periods and classical periods, and a "Haberland-type" formula which expresses Petersson's inner product and a related antisymmetric inner product on M!k in terms of periods.87 leaves, bound ; 29 cm.
Thesis (Ph. D.)--University of Hawaii at Manoa, 2010.
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Maharaj, Savitri. "A type-theoretic analysis of modular specifications." Thesis, University of Edinburgh, 1997. http://hdl.handle.net/1842/390.
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We study the problem of representing a modular specification language in a type-theory based theorem prover. Our goals are: to provide mechanical support for reasoning about specifications and about the specification language itself; to clarify the semantics of the specification language by formalising them fully; to augment the specification language with a programming language in a setting where they are both part of the same formal environment, allowing us to define a formal implementation relationship between the two. Previous work on similar issues has given rise to a dichotomy between "shallow" and "deep" embedding styles when representing one language within another. We show that the expressiveness of type theory, and the high degree of reflection that it permits, allow us to develop embedding techniques which lie between the "shallow" and "deep" extremes. We consider various possible embedding strategies and then choose one of them to explore more fully. As our object of study we choose a fragment of the Z specification language, which we encode in the type theory UTT, as implemented in the LEGO proof-checker. We use the encoding to study some of the operations on schemas provided by Z. One of our main concerns is whether it is possible to reason about Z specifications at the level of these operations. We prove some theorems about Z showing that, within certain constraints, this kind of reasoning is indeed possible. We then show how these metatheorems can be used to carry out formal reasoning about Z specifications. For this we make use of an example taken from the Z Reference Manual (ZRM). Finally, we exploit the fact that type theory provides a programming language as well as a logic to define a notion of implementation for Z specifications. We illustrate this by encoding some example programs taken from the ZRM.
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Meteoglu, Emel. "Modular architecting for effects based operations." Diss., Rolla, Mo. : University of Missouri-Rolla, 2007. http://scholarsmine.umr.edu/thesis/pdf/Meteoglu_09007dcc803c21e2.pdf.
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Thesis (M.S.)--University of Missouri--Rolla, 2007.Vita. The entire thesis text is included in file. Title from title screen of thesis/dissertation PDF file (viewed December 4, 2007) Includes bibliographical references (p. 67-69).
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Kusano, Markus Jan Urban. "Constraint-Based Thread-Modular Abstract Interpretation." Diss., Virginia Tech, 2018. http://hdl.handle.net/10919/84399.
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In this dissertation, I present a set of novel constraint-based thread-modular abstract-interpretation techniques for static analysis of concurrent programs. Specifically, I integrate a lightweight constraint solver into a thread-modular abstract interpreter to reason about inter-thread interference more accurately. Then, I show how to extend the new analyzer from programs running on sequentially consistent memory to programs running on weak memory. Finally, I show how to perform incremental abstract interpretation, with and without the previously mentioned constraint solver, by analyzing only regions of the program impacted by a program modification. I also demonstrate, through experiments, that these new constraint-based static analyzers are significantly more accurate than prior abstract interpretation-based static analyzers, with lower runtime overhead, and that the incremental technique can drastically reduce runtime overhead in the presence of small program modifications.Ph. D.
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Gass, Matthew S. "A quality control program analysis of modular housing." Thesis, Monterey, California. Naval Postgraduate School, 1989. http://hdl.handle.net/10945/26191.
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Fletcher, M. J. "A modular system for video based motion analysis." Thesis, University of Reading, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.293144.
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Creager, Douglas A. (Douglas Adam) 1979. "A modular architecture for biological microscope image analysis." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/87398.
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Delahaye, Benoît. "Modular specification and compositional analysis of stochastic systems." Rennes 1, 2010. http://www.theses.fr/2010REN1S091.
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Cette thèse présente des contributions originales pour la conception et la vérification de systèmes non déterministes et stochastiques. Nos résultats sont divisés selon trois lignes directrices. Premièrement, nous généralisons la théorie des interfaces au cas stochastique, en s'appuyant sur le formalisme classique des chaînes de Markov à intervalles pour construire la première théorie de spécification compositionnelle pour systèmes stochastiques : les chaînes de Markov à contraintes. Deuxièmement, nous étendons la notion de contrats hypothèse-garantie et développons une théorie compositionnelle à base de contrats pour systèmes stochastiques, pour laquelle nous proposons des notions quantitatives de raffinement et de satisfaction. Finalement, nous proposons une méthodologie pour la vérification de systèmes complexes, basée sur une abstraction stochastique. Cette méthodologie, combinée avec le model-checking statistique, est appliquée avec succès à un cas d'étude industrielThis thesis presents new contributions in the design and verification of systems mixing both non deterministic and stochastic aspects. Our results can be divided into three main contributions. First, we generalize interface theories to the stochastic setting. We build upon the known formalism of Interval Markov Chains to develop Constraint Markov Chains, the first fully compositional specification theory for stochastic systems. Second, we extend the notion of assume-guarantee contracts and develop a contract-based theory for stochastic systems, proposing quantitative notions for satisfaction and refinement. Finally, we propose a methodology for the verification of complex systems. This methodology is based on a stochastic abstraction of the environment where two components are working, allowing to verify the components individually. Combined with statistical model checking, this methodology is successfully applied to the verification of an industrial case study
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Autret, Arnaud. "Modular neural networks for analysis of flow cytometry data." Thesis, University of South Wales, 2003. https://pure.southwales.ac.uk/en/studentthesis/modular-neural-networks-for-analysis-of-flow-cytometry-data(49f3349b-e86a-4bfb-a689-c853323b6f2d).html.
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In predicting environmental hazards or estimating the impact of human activities on the marine ecosystem, scientists have multiplied the need for sample analysis. The classical microscopic approach is time consuming and wastes the talent and intellectual abilities of trained specialists. Therefore, scientists developed an automated optical tool, called a Flow Cytometer (FC), to analyse samples quickly and in large quantities. The flow cytometer has successfully been applied to real phytoplankton studies. However, analysis of the data extracted from samples is still required. Artificial Neural Networks (ANNs) are one of the tools applied to FC data analysis. Despite several successful applications, ANNs have not been widely adopted by the marine biologist community, as they can not possible to change the number of species in the classification problem without retraining of the full system from scratch. Training is time consuming and requires expertise in ANNs. Moreover, most ANN paradigms cannot cope effectively with unknown data, such as data coming from new phytoplankton species or from species outside the scope of the studies. This project developed a new ANN technique based on a modular architecture that removes the need for retraining and allows unknowns to be detected and rejected. Furthermore, the Support Vector Machine architecture is applied in this domain for the first time and compared against another ANN paradigm called Radial Basis Function Networks. The results show that the modular architecture is able to effectively deal with new data which can be incorporated into the ANN architecture without fully retraining the system.
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Lingham, Mark Peter. "Modular forms and elliptic curves over imaginary quadratic fields." Thesis, University of Nottingham, 2005. http://eprints.nottingham.ac.uk/10138/.
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The aim of this thesis is to contribute to an ongoing project to understand the correspondence between cusp forms, for imaginary quadratic fields, and elliptic curves. This contribution mainly takes the form of developing explicit constructions and computing particular examples. It is hoped that as well as being of interest in themselves, they will be helpful in guiding future theoretical developments. Cremona [7] began the programme of extending the classical techniques using modular symbols to the case of imaginary quadratic fields. He was followed by two of his students Whitley [25] and Bygott [5]. Together they have covered the cases where the class number of the field is equal to 1 or 2. This thesis extends their work to treat all fields of odd class number. It describes an algorithm, which holds for any such field, for determining the space of cusp forms, and for computing the eigenforms and eigenvalues for the action of the Hecke algebra on this space. The approach, using modular symbols, closely follows the work of the previous authors, but new techniques and theoretical simplifcations are obtained which hold in the case considered. All of the algorithms presented in this thesis have been implemented in a computer algebra package, Magma [3], and the results obtained for the fields Q(sqrt(-23)) and Q(sqrt(-31)) are included.
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Boke, Tevfik Ali. "Dynamic Stability Analysis Of Modular, Self-reconfigurable Robotic Systems." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606016/index.pdf.
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In this study, an efficient algorithm has been developed for the dynamic stability analysis of self-reconfigurable, modular robots. Such an algorithm is essential for the motion planning of self-reconfigurable robotic systems. The building block of the algorithm is the determination of the stability of a rigid body in contact with the ground when there exists Coulomb friction between the two bodies. This problem is linearized by approximating the friction cone with a pyramid and then solved, efficiently, using linear programming. The effects of changing the number of faces of the pyramid and the number of contact points are investigated. A novel definition of stability, called percentage stability, is introduced to counteract the adverse effects of the static indeterminacy problem between two contacting bodies.
The algorithm developed for the dynamic stability analysis, is illustrated via various case studies using the recently introduced self-reconfigurable robotic system, called I-Cubes.
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Louden, Thomas Luebbert Brian Winn Nathan. "An analysis of the joint modular intermodal distribution system." Monterey, Calif. : Naval Postgraduate School, 2007. http://bosun.nps.edu/uhtbin/hyperion-image.exe/07Jun%5FLouden%5FMBA.pdf.
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"Submitted in partial fulfillment of the requirements for the degree of Master of Business Administration from the Naval Postgraduate School, June 2007."Advisor(s): Apte, Aruna ; Lewis, Ira ; Brook, Doug. "June 2007." "MBA professional report"--Cover. Description based on title screen as viewed on August 16, 2007. Includes bibliographical references (p. 58-61). Also available in print.
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Louden, Thomas, Nathan Winn, and Brian Luebbert. "An analysis of the joint modular intermodal distribution system." Monterey California. Naval Postgraduate School, 2007. http://hdl.handle.net/10945/10248.
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MBA Professional ReportThe Joint Modular Intermodal Distribution System (JMIDS) is a Joint Capability Technology Demonstration (JCTD) initiative approved by the Deputy Under Secretary of Defense for Advanced Systems and Concepts. The purpose of JCTD is to evaluate a joint capability through Military Utility Assessments (MUAs) under a variety of military scenarios, while JMIDS aims to address interoperability problems facing the military supply chain. The operational concept of JMIDS is to provide a universal intermodal container system for automated handling, storage, and tracking of supply and ammunition shipments throughout the four Services in order to enhance visibility and increase efficiency in the supply chain. This Joint Modular Intermodal capability is achieved through the use of Joint Modular Intermodal Containers (JMIC), Joint Modular Intermodal Platforms (JMIP), and Automated Identification Technology (AIT). Through the use of these three systems, JMIDS permits the efficient and seamless movement of supplies and retrograde operations through the air, land and sea distribution system to all military locales. The purpose of this thesis is to analyze the costs and benefits of implementing the JMIDS capability within the Defense Distribution System (DDS).
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Mason, Derwood J. "An analysis of quality in the modular housing industry." Thesis, Springfield, Virginia: Available from National Technical Information Service, 1991. http://hdl.handle.net/10945/27978.
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Al-Kofahi, Khalid A. "Reliability analysis of triple modular redundancy system with spare /." Online version of thesis, 1993. http://hdl.handle.net/1850/11565.
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Ren, Zhen. "Modular model assembly from finite element models of components." Diss., Connect to online resource - MSU authorized users, 2008.
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Merazzi, Silvio. "Modular finite element analysis tools applied to problems in engineering /." Lausanne : EPFL, 1994. http://library.epfl.ch/theses/?nr=1251.
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McCarthy, David James. "Analysis of the novel Lyn-associated cytoskeletal modular protein, LACM." University of Western Australia. School of Medicine and Pharmacology, 2009. http://theses.library.uwa.edu.au/adt-WU2009.0180.
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A yeast-two hybrid screen with Lyn identified a novel 130 kDa multidomain protein with a 36% identity to Actin Filament Associated Protein (AFAP) 110 and similar domains, including PH domains, potential sites of tyrosine and serine/threonine phosphorylation, a leucine-zipper domain, a potential actin binding site and multimerization site. AFAP110 has been shown to have a role in modulating actin filament integrity and induce lamellipodia formation, and is known to interact with Src family kinases. The aim of this thesis was to characterize this novel protein named Lyn-Associated Cytoskeletal Modulator (LACM) and determine any molecular interactions in order to attempt to elucidate a role for the protein in cell signaling through Lyn. LACM is encoded by a gene consisting of 18 exons and is located on human chromosome 5q33.1 and mouse chromosome 18 E1. LACM protein is expressed through a number of cell types including the R11 erythroid cell line, and mouse tissues including brain, lung, heart and embryos. LACM was shown to multimerize, and subcellular localization of the protein was observed to concentrate around the cell membrane at sites of filamentous actin in filopodia, lamellipodia and stress fibres. The carboxy-terminus of LACM was observed to localize the protein to sites at the cell membrane and through the cytoplasm. Removal of this terminal region resulted in all LACM protein localizing to the nucleus in punctuate spots. LACM protein was observed in heart muscle and potentially has a role at sites of nerve junctions on cardiac myocytes. LACM was shown to interact with the SH3 domain of Lyn at a polyproline motif on LACM. LACM was observed to co-localize and co-immunoprecipitate with Lyn and was tyrosine phosphorylated by the kinase domain of Lyn. Interestingly, the consititutively active Lyn and LACM caused transfected cells to
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Ermedahl, Andreas. "A Modular Tool Architecture for Worst-Case Execution Time Analysis." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis : Univ.-bibl. [distributör], 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-3502.
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Harradon, Michael Robert. "Quantitative spectral data acquisition and analysis with modular smartphone assemblies." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/100662.
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Thesis: M. Eng., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2014.Cataloged from PDF version of thesis.
Includes bibliographical references (page 37).
A low-cost cell phone spectrometer using the image sensor in the cell phone camera is developed and analyzed. The spectrometer design is optimized for sensitivity and spectral resolution. Calibration techniques are developed to enable robust data collection across different phone models with minimal equipment. Novel algorithms for robust calibration with minimal equipment are described and implemented. The spectrometer is then characterized for use in colorimetric systems. Finally, the cell phone spectrometer is used in a forensic application for dating blood spots based on time-dependent oxidation-induced spectral changes.
by Michael Robert Harradon.
M. Eng.
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Shiwakoti, Rochak. "Design and Analysis of Modular Axial Flux Switched Reluctance Motor." ScholarWorks@UNO, 2019. https://scholarworks.uno.edu/td/2680.
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This thesis presents a new modular structure of the axial flux Switched Reluctance Motor (SRM). The design consists of four stator disks with each adjacent disk rotated 30 degrees apart and four rotor disks connected to a common shaft. The proposed design aims to reduce the unwanted radial force, mitigate the torque ripple, and improve the efficiency. The modular structure distributes the radial force and torque strokes along the axial length of the motor, potentially damping the torque pulsation. In addition, the modular structure would deliver the rating power at a lower current level, reducing the overall ohmic loss. Moreover, if a fault occurs on a motor disk or its control unit, the motor would still operate through other disks, increasing the reliability of the system. To verify the effectiveness of the proposed design, the magneto-static and transient performance of the motor are compared with the conventional single layer structure using 3-D Finite-Element (FE) software tool to see that the proposed motor performs better with lower torque ripple and lower radial force than a conventional single layer structure.
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Yu, Jianghui. "DC Fault Current Analysis and Control for Modular Multilevel Converters." Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/78054.
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Recent research into industrial applications of electric power conversion shows an increase in the use of renewable energy sources and an increase in the need for electric power by the loads. The Medium-Voltage DC (MVDC) concept can be an optimal solution. On the other hand, the Modular Multilevel Converter (MMC) is an attractive converter topology choice, as it has advantages such as excellent harmonic performance, distributed energy storage, and near ideal current and voltage scalability.
The fault response, on the other hand, is a big challenge for the MVDC distribution systems and the traditional MMCs with the Half-Bridge submodule configuration, especially when a DC short circuit fault happens. In this study, the fault current behavior is analyzed. An alternative submodule topology and a fault operation control are explored to achieve the fault current limiting capability of the converter.
A three-phase SiC-based MMC prototype with the Full-Bridge configuration is designed and built. The SiC devices can be readily adopted to take advantage of the wide-bandgap devices in MVDC applications. The Full-Bridge configuration provides additional control and energy storage capabilities. The full in-depth design, controls, and testing of the MMC prototype are presented, including among others: component selection, control algorithms, control hardware implementation, pre-charge and discharge circuits, and protection scheme.
Systematical tests are conducted to verify the function of the converter. The fault current behavior and the performance of the proposed control are verified by both simulation and experiment. Fast fault current clearing and fault ride-through capability are achieved.Master of Science
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Obaidat, Mohammad Salameh. "A 68000 based modular multiprocessor system : design and simulation analysis /." The Ohio State University, 1986. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487266362336169.
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Cheraghi, Seyed Hossein 1957. "MULTIPLE CHOICE MODULAR DESIGN PROBLEM EXPERIMENTAL RESULTS AND SENSITIVITY ANALYSIS." Thesis, The University of Arizona, 1987. http://hdl.handle.net/10150/276429.
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Irudayaraj, Prashanth Philip. "Lifecycle cost analysis for modular design of solar power systems." Thesis, Georgia Institute of Technology, 2016. http://hdl.handle.net/1853/55029.
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Solar power systems are becoming increasingly popular due to the fact that solar power can offer time and money saving solutions for off-grid and grid-connected homes, cabins, and businesses with clean and affordable energy. However, there are still significant opportunities to reduce the cost of solar power systems by optimizing system design. This paper presents a methodology for evaluating the lifecycle labor costs of solar power systems. This methodology can help optimize system designs relative to cost. It can also support solar power system selection decisions based on a holistic lifecycle view. The methodology accomplishes this by first presenting a method to evaluate the modularity of competing systems, or design variants. It then describes a method of gathering data and modeling the systems so that it can be communicated to relevant stakeholders. Finally, it uses discrete event simulation to generate an estimate of relative lifecycle labor cost performance. Verification and validation of the methods described are presented through a case study of the MegaModule residential solar power system, designed by the team at GTRI. The paper concludes with a review of limitations and proposed future work.
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Hahmann, Martin, Claudio Hartmann, Lars Kegel, Dirk Habich, and Wolfgang Lehner. "Big by blocks: Modular Analytics." De Gruyter, 2016. https://tud.qucosa.de/id/qucosa%3A72848.
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Big Data and Big Data analytics have attracted major interest in research and industry and continue to do so. The high demand for capable and scalable analytics in combination with the ever increasing number and volume of application scenarios and data has lead to a large and intransparent landscape full of versions, variants and individual algorithms. As this zoo of methods lacks a systematic way of description, understanding is almost impossible which severely hinders effective application and efficient development of analytic algorithms. To solve this issue we propose our concept of modular analytics that abstracts the essentials of an analytic domain and turns them into a set of universal building blocks. As arbitrary algorithms can be created from the same set of blocks, understanding is eased and development benefits from reusability.
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Manurkar, Shaunak Sudhir. "Modular GC: A Fully Integrated Micro Gas Chromatography System." Thesis, Virginia Tech, 2021. http://hdl.handle.net/10919/105044.
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Gas Chromatography (GC) is one of the most important and widely used tools in analytical
chemistry. However, they are bulky, have a longer measurement cycle, and consume a high
amount of power. Micro-Gas Chromatography (µGC) is portable and energy-efficient, which
allows onsite, real-time biological, forensic, and environmental analyses. This thesis presents
a ready-to-deploy implementation of microfabricated gas chromatography (µGC) system capable of separating complex samples. We describe robust, modular, and scalable hardware
and software architecture based on Real-Time Operating System (RTOS) and Python Graphical User Interface (GUI) integrated with various microfabricated devices to realize a fully
functional µGC system. A sample heater for headspace injection, microfabricated separation
column (µSC), a Photoionization Detector (PI-D), and a flow controller unit are integrated
with the modular hardware and software to realize a fully functional Vacuum Outlet µGC
system. We have designed a novel auto-calibration method for temperature calibration of
the microfabricated devices which does not require changing the electronic circuitry or reprogramming the device. The vacuum outlet µGC setup is tested with various mixture of
analytes. For these experiments, an average relative standard deviation (RSD) for retention
time repeatability of 2.5% is achieved. Data processing techniques for raw chromatograms,
including baseline correction and peak detection, are implemented on a microcontroller board
and tested extensively as a part of this work. A novel algorithm for multidimensional analysis for the identification of co-eluting compounds in complex samples is implemented with
a prediction accuracy of 94%.Master of Science
Toxic volatile organic compounds (VOCs) such as benzene and toluene found in gasoline and xylene used in ink, rubber, and leather industries are of concern as they are present at elevated concentrations due to their higher vapor pressure. Sufficient exposure to these toxicants, even at lower concentrations like 100 parts-per-billion-volume (ppbv), may cause adverse health effects. Gas Chromatography (GC) has been the established method for assessing the presence and concentration of VOCs in the environment. Traditional GC systems are bulky, power-hungry, expensive, and require expert supervision for analysis. Recent research in microelectromechanical systems (MEMS) has reduced the size of the GC components, also called micro-GC (µGC), while improving the performance. The majority of the research and development of µGC is aimed at advancing microfabricated components such as preconcentrators, separation columns, and gas detectors. However, the integration of these different components is an important topic that requires more investigation. In this thesis, we present a robust and scalable software and hardware architecture that can be used to develop a portable and modular µGC system. The thesis discusses different experiments to calibrate various microfabricated devices, which are then used to build a fully modular µGC system. We show the separation capacity of the modular µGC system by passing complex compounds like kerosene and diesel. As the chromatogram from the µGC system has noise, the second part of the thesis explores data analysis techniques such as baseline correction, peak detection. These data analysis tools are used to filter the noise, detect relevant peaks in the chromatograms, and identify the compounds in a complex sample.
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Li, Chen. "State Space Modeling and Power Flow Analysis of Modular Multilevel Converters." Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/71811.
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For the future of sustainable energy, renewable energy will need to significantly penetrate existing utility grids. While various renewable energy sources are networked with high-voltage DC grids, integration between these high-voltage DC grids and the existing AC grids is a significant technical challenge. Among the limited choices available, the modular multi-level converter (MMC) is the most prominent interface converter used between the DC and AC grids. This subject has been widely pursued in recent years. One of the important design challenges when using an MMC is to reduce the capacitor size associated with each module. Currently, a rather large capacitor bank is required to store a certain amount of line-frequency related circulating energy. Several control strategies have been introduced to reduce the capacitor voltage ripples by injecting certain harmonic current. Most of these strategies were developed using trial and error and there is a lack of a systematic means to address this issue. Most recently, Yadong Lyu has proposed to control the modulation index in order to reduce capacitor ripples. The total elimination of the unwanted circulating power associated with both the fundamental line frequency and the second-order harmonic was demonstrated, and this resulted in a dramatic reduction in capacitor size. To gain a better understanding of the intricate operation of the MMC, this thesis proposes a state-space analysis technique in the present paper. Combining the power flow analysis with the state trajectory portrayed on a set of two-dimensional state plans, it clearly delineates the desired power transfer from the unwanted circulating energy, thus leading to an ultimate reduction in the circulation energy and therefore the required capacitor volume.Master of Science
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Ozer, Semih. "Analysis Of Critical Factors Affecting Customer Satisfaction In Modular Kitchen Sector." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/2/12610593/index.pdf.
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This study starts with the review of the literature in customer satisfaction, customer satisfaction methods and models. After selecting a proper customer satisfaction method and model, the study conducts a survey and a questionnaire among the customers and professionals in the modular kitchen sector. The aim of the study is to analyze the factors affecting customer satisfaction and finding out the ones related with the modular kitchen sector. After applying the survey, the relations between the inputs and outputs of the satisfaction are analyzed with the overall satisfaction itself. The strong and weak factors are determined and a proper CRM tool is build-up to realize a decision-support and forecast tool in the study, which can be seen as a beginning for the companies in the real sector in this business to build a much more detailed and ERP integrated software and to use them. The results of the survey are compared with the similar studies from the literature.
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Xu, Xin. "MODULAR FAST DIRECT ANALYSIS USING NON-RADIATING LOCAL-GLOBAL SOLUTION MODES." UKnowledge, 2008. http://uknowledge.uky.edu/gradschool_diss/690.
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This dissertation proposes a modular fast direct (MFD) analysis method for a class of problems involving a large fixed platform region and a smaller, variable design region. A modular solution algorithm is obtained by first decomposing the problem geometry into platform and design regions. The two regions are effectively detached from one another using basic equivalence concepts. Equivalence principles allow the total system model to be constructed in terms of independent interaction modules associated with the platform and design regions. These modules include interactions with the equivalent surface that bounds the design region. This dissertation discusses how to analyze (fill and factor) each of these modules separately and how to subsequently compose the solution to the original system using the separately analyzed modules.
The focus of this effort is on surface integral equation formulations of electromagnetic scattering from conductors and dielectrics. In order to treat large problems, it is necessary to work with sparse representations of the underlying system matrix and other, related matrices. Fortunately, a number of such representations are available. In the following, we will primarily use the adaptive cross approximation (ACA) to fill the multilevel simply sparse method (MLSSM) representation of the system matrix. The MLSSM provides a sparse representation that is similar to the multilevel fast multipole method.
Solutions to the linear systems obtained using the modular analysis strategies described above are obtained using direct methods based on the local-global solution (LOGOS) method. In particular, the LOGOS factorization provides a data sparse factorization of the MLSSM representation of the system matrix. In addition, the LOGOS solver also provides an approximate sparse factorization of the inverse of the system matrix. The availability of the inverse eases the development of the MFD method. Because the behavior of the LOGOS factorization is critical to the development of the proposed MFD method, a significant part of this dissertation is devoted to providing additional analyses, improvements, and characterizations of LOGOS-based direct solution methods. These further developments of the LOGOS factorization algorithms and their application to the development of the MFD method comprise the most significant contributions of this dissertation.
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Hilding, Amanda. "Evaluation and Consequences Analysis of a Manual Shifter with Modular Design." Thesis, Blekinge Tekniska Högskola, Institutionen för maskinteknik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-5202.
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Subcontractors in the automotive industry, have a lot of pressure to bring down costs and to deliver products that are effective, optimized and qualitative. The main purpose of this study is to guide and conduct the first step in the project Standard Building Blocks with modular design, within the business area, manual shifter. The project is directly presented by Kongsberg Automotive, a well-known subcontractor of the automotive industry. The aim of the project is to develop a standard manual shifter with modular design containing standard building blocks. Five different components have been selected in the manual shifter for this study. In each component, there are several concepts on how to design that specific component. The target of the study is to evaluate and analyze the concepts and based on the results decide which of the concepts to be standard building blocks. The study identifies, evaluates and analyses the consequences of the project Standard Building Blocks for the chosen concepts. The results from the study show that some concepts have a greater tendency to form standard building blocks when compared to others. In the study it was proven that non-measurable values have the same significance as the measured values. The results also show that the most suitable concepts depends on the customers’ specifications. The consequence analysis presented many consequences of what an implementation of standard building blocks may imply, from the advantages to possible risk elements. Through the consequence analysis the studied company can become more prepared for the future.Underleverantörerna inom fordonsindustrin har en stor press när det kommer till hålla nere kostnader och att leverera effektiva, optimerade och kvalitativa produkter. Huvudsyftet med studien är att guida och genomföra det första steget i projektet Standard Building Blocks med modulär design, inom affärsområdet, manuella växelreglage. Projektet är direkt framtaget av Kongsberg Automotive, en välkänd underleverantör inom fordonsindustrin. Målet med projektet är att utveckla en standard manuell växelreglage med modulär design innehållande standard building blocks. Fem olika komponenter har valts ut i den manuell växelreglaget för studien. För varje komponent finns det flera koncept hur den specifika komponenten kan designas. Målet med studien är att utvärdera och analysera koncepten och utifrån resultatet avgöra vilka av koncepten som kan bilda standard building blocks. Studien identifierar, utvärderar och analyserar konsekvenser av projektet Standard Building Blocks för de valda koncepten. Resultatet från studien visade att vissa koncept har en större tendens att bilda standard building blocks än andra. I studien blev det bevisat att icke-mätbara värden har lika stor betydelse som uppmätta värdena. Resultatet visade också att de mest lämpade koncepten beror på kundens specifikationer. Konsekvensen analysen presenter många konsekvenser av vad en implementation av standard building blocks kan innebära, från fördelar till eventuella riskfaktorer. Genom konsekvensanalysen kan det studerade företaget bli mer förberedda för framtiden.
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Thomas, John Stephen. "Modular gas-cooled reactor economics : the application of continent-claims analysis." Thesis, Massachusetts Institute of Technology, 1991. http://hdl.handle.net/1721.1/13220.
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Pickett, Sara C. (Sara Catherine) 1976. "A partial implementation of a modular system for software safety analysis." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/86532.
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Thesis (S.B. and M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2000.Includes bibliographical references (leaves 62-63).
by Sara C. Pickett.
S.B.and M.Eng.
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Chan, Sheldon Y. (Sheldon Yann-Ting). "A modular architecture for client-based analysis of biological microscopy images." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/36793.
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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2006.Includes bibliographical references.
In this project, we have proposed a decorrelator-based single antenna interference cancellation algorithm for the asynchronous GSM/GPRS network. The algorithm is tested according to the current SAIC/DARP performance requirement in the computer simulation, and is shown to give various gains in different test scenarios.
by Sheldon Y. Chan.
M.Eng.
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Monteiro, Josà MÃrcio Feitosa. "Analysis of the constructability of a modular masonry ceramic social housing." Universidade Federal do CearÃ, 2012. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=9718.
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CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel SuperiorFundaÃÃo de Amparo à Pesquisa do Estado do CearÃ
The Brazilian housing deficit is a problem that primarily affects the poorest part of the population. Its solution is not only to implement huge housing programs or to develop building systems, but also to evaluate these actions through the analysis of its constructability. Lower cost construction systems, tailored to local realities which can ensure to families con fort, safety and quality of life are essential when it comes to design and build social housing - SH (HIS on Portuguese). This paper, therefore, presents the development process of a modular masonry for ceramic blocks, since its conception and design until its implementation in a constructive prototype and analyses the same from the standpoint of constructability. Thus, the study uses a methodology of intensive recording and monitoring of the system's project and implementation phases. It performs a critical analysis of them, investigating, qualitatively, the constructability of the system and proposing improvements for it to reach a higher integrat ion level between projectual and executive phases. As a result, there is a systematic for studying the constructability applicable to other building systems, with results that contribute to continuous improvement on build of social housing
O dÃficit habitacional brasileiro à um problema que afeta principalmente a parcela mais pobre da populaÃÃo. Sua soluÃÃo passa nÃo somente pela execuÃÃo de grandes programas habitacionais ou pelo desenvolvimento de sistemas construtivos, mas tambÃm pela avaliaÃÃo destes por meio da anÃlise de sua construtibilidade. Sistemas construtivos de menor custo, adaptados Ãs realidades locais e que possam garantir Ãs famÃlias conforto, seguranÃa e qualidade de vida sÃo essenciais quando se trata de projetar e executar habitaÃÃes de interesse social - HIS. O presente trabalho, pois, apresenta o processo de desenvolvimento de um sistema modular em alvenaria de blocos cerÃmicos, desde sua concepÃÃo e projeto atà sua aplicaÃÃo na execuÃÃo de um protÃtipo construtivo, e analisa o mesmo sob a Ãtica da construtibilidade. Para tanto, o trabalho utiliza uma metodologia de acompanhamento e registro intensivos das fases de projetaÃÃo e execuÃÃo do sistema e realiza um estudo crÃtico das mesmas, investigando sua construtibilidade qualitativamente e propondo melhorias a fim de que o mesmo alcance um patamar superior de integraÃÃo entre as fases projetual e executiva. Tem-se como resultado uma sistemÃtica de estudo da construtibilidade que pode ser aplicada em outros sistemas construtivos, com a consequÃncia de benefÃcios para a melhoria contÃnua na construÃÃo de habitaÃÃes de interesse social.
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Fratello, John David. "Multi-body Dynamics Simulation and Analysis of Wave-adaptive Modular Vessels." Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/76787.
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Catamarans provide vast deck space, high thrust efficiency, and excellent transverse stability, however, in rough conditions they can be susceptible to deck slamming from head seas or bow diving in following seas and a pitch-roll coupling effect that can lead to uncomfortable corkscrew motion under bow-quartering seas. A new class of catamaran called Wave-Adaptive Modular Vessels (WAM-V™) aims to help mitigate oceanic input from the cabin by allowing for the relative motion of components not common to classic catamaran design. This thesis presents a set of multi-body dynamics simulation models created for two active WAM-Vs™ along with analysis on their suspension characteristics. Both models provide conclusive and realistic results, with the final model being validated against on-water testing data from a 12-ft unmanned prototype WAM-V.
The first of these simulations serves primarily as a tool to evaluate WAM-V™ response characteristics with respect to a variety of parametric variations. The modeling environment is highlighted along with details of the parametric simulation and how it was created. The results fall in line with our expectations and are presented along with analysis of the sensitivity of each parameter at three longitudinal locations. The final simulation attempts to model the response of a 12-ft unmanned surface vessel (USV) prototype of the WAM-V™ configuration. Testing data is collected, processed, and applied to the model for validation of its prediction accuracy. The results of the sea tests indicate that the simulation model performs well in predicting USV motions at sea. Future considerations for testing WAM-Vs™ can include changes in suspension and mass parameters as well as limiting particular degrees-of-freedom by making their joints rigid.Master of Science
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Hanson, Niels William. "MetaPathways : a modular pipeline for the analysis of environmental sequence information." Thesis, University of British Columbia, 2015. http://hdl.handle.net/2429/52845.
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The lack of cultivated reference strains for the majority of naturally occurring microorganisms has lead to the development of plurality sequencing methods and the field of metagenomics, offering a glimpse into the genomes of this so-called 'microbial dark matter' (MDM). An explosion of sequencing initiatives has followed, attempting to capture and extract biological meaning from MDM across a wide range of ecosystems from deep-sea vents and polar seas to waste-water bioreactors and human beings. Current analytic approaches focus on taxonomic structure and metabolic potential through a combination of phylogenetic anchor screening of the small subunit ribosomal RNA gene (SSU or 16S rRNA) and general sequence searches using homology-based inference. Though much has been learned about microbial diversity and metabolic potential within natural and engineered ecosystems using these approaches, they are insufficient to resolve the ecological relationships that couple nutrient and energy flow between community members - ultimately translating into ecosystem functions and services. This shortcoming arises from a combination of data-intensive challenges presented by environmental sequence information that span processing, integration, and interpretation steps, and a general lack of robust statistical and analytical methods to directly address these problems.
This dissertation addresses some of these shortcomings through the development of a modular analytical pipeline, MetaPathways, allowing for the large-scale and systematic processing and integration of many forms of environmental sequence information. MetaPathways is built to scale, comparing hundreds of metagenomic samples through the efficient use of data structures, grid compute models, and interactive data query. Moreover, it attempts to bring functional analysis back to the metabolic map through the creation of environmental pathway/genome databases (ePGDBs), adopting the Pathway Tools software for metabolic pathway prediction on the MetaCyc encyclopedia of genes and genomes. ePGDBs and the pathway-centric approach are validated to provide known and novel insights into community structure and function. Finally, novel taxonomic and metabolic methods supporting the pathway-centric model are derived and demonstrated, and enhance Pathway Tools as a framework for engineering microbial communities and consortia.Science, Faculty of
Graduate
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de, Carvalho Gomes Pedro. "Sound Modular Extraction of Control Flow Graphs from Java Bytecode." Licentiate thesis, KTH, Teoretisk datalogi, TCS, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-105275.
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Control flow graphs (CFGs) are abstract program models that preserve the control flow information. They have been widely utilized for many static analyses in the past decades. Unfortunately, previous studies about the CFG construction from modern languages, such as Java, have either neglected advanced features that influence the control flow, or do not provide a correctness argument. This is a bearable issue for some program analyses, but not for formal methods, where the soundness of CFGs is a mandatory condition for the verification of safety-critical properties. Moreover, when developing open systems, i.e., systems in which at least one component is missing, one may want to extract CFGs to verify the available components. Soundness is even harder to achieve in this scenario, because of the unknown inter-dependencies involving missing components. In this work we present two variants of a CFG extraction algorithm from Java bytecode considering precise exceptional flow, which are sound w.r.t to the JVM behavior. The first algorithm extracts CFGs from fully-provided (closed) programs only. It proceeds in two phases. Initially the Java bytecode is translated into a stack-less intermediate representation named BIR, which provides explicit representation of exceptions, and is more compact than the original bytecode. Next, we define the transformation from BIR to CFGs, which, among other features, considers the propagation of uncaught exceptions within method calls. We then establish its correctness: the behavior of the extracted CFGs is shown to be a sound over-approximation of the behavior of the original programs. Thus, temporal safety properties that hold for the CFGs also hold for the program. We prove this by suitably combining the properties of the two transformations with those of a previous idealized CFG extraction algorithm, whose correctness has been proven directly. The second variant of the algorithm is defined for open systems. We generalize the extraction algorithm for closed systems for a modular set-up, and resolve inter-dependencies involving missing components by using user-provided interfaces. We establish its correctness by defining a refinement relation between open systems, which constrains the instantiation of missing components. We prove that if the relation holds, then the CFGs extracted from the components of the original open system are sound over-approximations of the CFGs for the same components in the refined system. Thus, temporal safety properties that hold for an open system also hold for closed systems that refine it. We have implemented both algorithms as the ConFlEx tool. It uses Sawja, an external library for the static analysis of Java bytecode, to transform bytecode into BIR, and to resolve virtual method calls. We have extended Sawja to support open systems, and improved its exception type analysis. Experimental results have shown that the algorithm for closed systems generates more precise CFGs than the modular algorithm. This was expected, due to the heavy over-approximations the latter has to perform to be sound. Also, both algorithms are linear in the number of bytecode instructions. Therefore, ConFlEx is efficient for the extraction of CFGs from either open, or closed Java bytecode programs.QC 20121122
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AraÃjo, Marcela Costa. "Analysis of integration construction of the production chain in the metropolitan region of Fortaleza." Universidade Federal do CearÃ, 2015. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=15722.
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Financiadora de Estudos e ProjetosCoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel Superior
A construÃÃo civil à uma indÃstria bastante singular. Trata-se de uma cadeia muito complexa e de grande importÃncia dado os impactos que esta possui na economia e no consumo de recursos naturais. No ano de 2010 entrou em vigor a Norma de CoordenaÃÃo Modular que busca atravÃs da padronizaÃÃo reduzir custos e desperdÃcios nesta indÃstria. A cadeia produtiva da construÃÃo civil necessita melhorar sua integraÃÃo de forma a torna-se mais competitiva ao mesmo tempo em que necessita adaptar-se as constantes mudanÃas no cenÃrio externo, tais como regulaÃÃes do mercado e reduÃÃo do impacto ambiental. Esta pesquisa analisa e busca compreender os entraves existentes ao desenvolvimento da Cadeia da ConstruÃÃo Civil na RegiÃo Metropolitana de Fortaleza, considerando aspectos de padronizaÃÃo e legislaÃÃo ambiental. Esta pesquisa aborda os fluxos produtivos em fÃbrica de blocos de concreto, cerÃmicos, canteiros de obras e os respectivos impactos na aplicaÃÃo da coordenaÃÃo modular e avalia as expectativas quanto ao uso da coordenaÃÃo modular pelos atores envolvidos, proporcionando diretrizes para a modelagem da cadeia da construÃÃo civil. Os resultados alcanÃados indicam que a coordenaÃÃo modular ainda nÃo à conhecida e aplicada pelas empresas mesmo com a existÃncia da Norma de CoordenaÃÃo Modular desde 2010 e que este desconhecimento prejudica o desenvolvimento e o desempenho da cadeia, podendo impactar negativamente no meio-ambiente.
The building is a fairly unique industry. It is a very complex chain of great importance given the effects that this has on the economy and consumption of natural resources. In 2010 came into force on Modular Coordination standard that seeks to reduce costs through standardization and waste in this industry. The supply chain of construction needs to improve their integration in order to become more competitive at the same time it needs to adapt to the constant changes in the external environment, such as market regulations and reducing environmental impact. This research analyzes and seeks to understand the existing barriers to the development of the Construction chain in the metropolitan area of Fortaleza, considering aspects of standardization and environmental legislation. This research deals with the production flows in factory of concrete blocks, ceramic, construction sites and their impacts on the application of modular coordination and evaluates the expectations regarding the use of modular coordination by the actors involved, providing guidelines for the modeling of the construction chain civil. The results indicate that the modular coordination is not yet known and applied by companies despite the existence of Modular Coordination Standard since 2010 and that this lack harms the development and performance of the chain, which may negatively impact on the environment.
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Wandeler, Ernesto. "Modular performance analysis and interface-based design for embedded real-time systems /." Aachen : Shaker Verlag, 2006. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=16819.
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Maalek, S. "Finite element analysis of modular structures and the behaviour of castellated beams." Thesis, University of Manchester, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.488207.
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Whitney, Jonathan Newcomb Swirsky 1979. "Description and analysis of central registry, a pattern for modular implicit invocation." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/61857.
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Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2002.Includes bibliographical references (p. 83).
Central Registry is a generalization of several implicit-invocation design patterns. Its goal is to provide the kind of decoupling that implicit invocation provides in a more modular and flexible way than current patterns. We describe the pattern in detail and present a formal model of its key features. Using the formal model, we are able to establish, by automatic analysis, properties of any system that uses the pattern. We also describe an implementation framework for the pattern and evaluate its use in five substantial programs. Keywords: Design Patterns, Implicit Invocation, Formal Models, Component Architectures.
by Jonathan Newcomb Swirsky Whitney.
M.Eng.
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Hart, Anastasios John 1979. "Design and analysis of kinematic couplings for modular machine and instrument structures." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/89338.
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Nguyen, Christopher Dinh. "Fast modular exponentiation using residue domain representation| A hardware implementation and analysis." Thesis, University of Maryland, Baltimore County, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=1551346.
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Using modular exponentiation as an application, we engineered on FPGA fabric and analyzed the first implementation of two arithmetic algorithms in Reduced-Precision Residue Number Systems (RP-RNS): the partial-reconstruction algorithm and quotient-first scaling algorithm. Residue number systems (RNS) provide an alternative representation to the binary system for computation. They offer full parallel computation for addition, subtraction, and multiplication. However, base extension, division, and sign detection become harder operations. Phatak's RP-RNS uses a time-memory trade-off to achieve O(lg N) running time for base extension and scaling, where N is the bit-length of the operands, compared with Kawamura's Cox-Rower architecture and its derivatives, which appear to take O(N) steps and therefore O(N) delay to the best of our knowledge. We implemented the fully parallel RP-RNS architecture based on Phatak's description and architecture diagrams. Our design decisions included distributing the lookup tables among each channel, removing the adder trees, and removing the parallel table access thus trading size for speed. In retrospect, we should have hosted the tables in memory off the FPGA. We measured the FPGA utilization, storage size, and cycle counts. The data we present, though less than optimal, confirms the theoretical trends calculated by Phatak. FPGA utilization grows proportional K log(K) where K is the number of hardware channels. Storage grows proportional to O(N
3 lg lg N). When using Phatak's recommendations,cycle count grows proportional to O(lg N). Our contributions include documentation of our design, architecture, and implementation; a detailed testing methodology; and performance data based on our implementation to enable others to replicate our implementation and findings.
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Andreev, Maxim, Artem Kolesnikov, Uwe Grätz, and Julia Gundermann. "Simulation-based system reliability analysis of electrohydraulic actuator with dual modular redundancy." Technische Universität Dresden, 2020. https://tud.qucosa.de/id/qucosa%3A71268.
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This paper describes the failure detection system of an electro-hydraulic actuator with dual modular redundancy based on a hybrid twin TM concept. Hybrid twin TM is a combination of virtual twin that operates in parallel with the actuator and represents its ideal behaviour, and a digital twin that identifies possible failures using the sensor readings residuals. Simulation-based system reliability analysis helps to generate a dataset for training the digital twin using machine learning algorithms. A systematic failure detection approach based on decision trees and the process of analysing the quality of the result is described.
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Zeng, Rong. "Design, analysis and operation of hybrid modular multilevel converters for HVDC applications." Thesis, University of Strathclyde, 2015. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=25404.
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This thesis investigates the design, analysis, and operation of modular multilevel converters (MMC) for HVDC applications. Based on the operation principles of the MMC, the operation of MMC under asymmetrical arm impedance conditions is analysed using three equivalent sub-circuits at different freqeuncy. Detail analysis of the impact of asymmetrical conditions on the differential-mode current, the common-mode current and sub-module (SM) capacitor voltages, is performed. Based on the analysis, the corresponding control targets and an improved control strategy are designed to improve the operation performance. Considering the advantages of half-bridge based SM (HBSM) and full-bridge based SM (FBSM), a hybrid MMC (H-MMC) configuration consisting of FBSMs and HBSMs is proposed. By adopting the negative voltage state for some of the FBSMs, the output voltage range is extended to increase converter power transmission capability. By considering the relationships between the AC and DC voltages, AC, DC and arm currents, the ratio of the numbers of the FBSM to HBSM is analysed in order to maintain capacitor voltage balance and retain DC fault blocking capability. An equivalent circuit for the H-MMC is proposed, which considers each arm to be consisted of two individual voltage sources. This model is used to analyse SM capacitor voltage balancing and ripple. A two-stage selection and sorting algorithm is developed to ensure capacitor voltage balancing among the SMs. The proposed H-MMC is compared to other topologies in terms of power device utilization and power losses, and it shows that the H-MMC has higher device utilization and lower power loss than the conventional FBSM based MMC; Furthermore, The DC fault ride-through capability of the H-MMC are discussed. It is found that the H-MMC can not only isolate the DC fault, but also coniture operating at a wide DC voltage range from zero to rated value. Such two features of the H-MMC show the advantages in the hybrid configurations over the conventional FBSM and HBSM systems. Finally, two applications based on the proposed H-MMC are presented; one is a high power DC/DC converter with fault blocking capability for interconnecting large HVDC systems, and the other is a hybrid HVDC transmission system comprising a wind farm side VSC based on the H-MMC and a grid side LCC for transmitting wind power to AC grid.
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Belguzhanov, Rustem. "Preliminary system design of the modular satellite." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019.
Find full textAbstract:
The main scope of the present thesis centres around two key points: modular block and binding interface of 4 types (mechanical/electrical/data/thermal). Throughout
the development process, the preliminary design of the modular block and mechanical interface was continuously modified, that eventually evolved into the micro-satellite
platform of different unit sizes for various mission applications. Similar to CubeSat platforms, it opens perspectives for a cheaper and faster satellite deployment by means of modularization and standardization of future satellite systems.
The proposed design is fully analysed from different perspectives and later compared to the satellite built in accordance with the traditional approach. This gives
the assurance of the validity of the comparison due to the similar mission.
As a part of the validation process, the economic analysis was conducted for three different approaches in spacecraft design, which led to the determination of the feasibility of small-mass production and plans for the future satellite constellation.