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Cliett, Terra N. "A Comparative Evaluation of Matrix Training Arrangements." Thesis, University of North Texas, 2017. https://digital.library.unt.edu/ark:/67531/metadc984242/.
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A common goal of instructional techniques is to teach skills effectively and efficiently. Matrix training techniques are both effective and efficient as they allow for the emergence of untrained responding to novel stimulus arrangements, a phenomenon known as recombinative generalization. However, it is unclear which type of matrix arrangement best promotes recombinative generalization. The current study compared two common matrix training approaches, an overlapping (OV) design and a non-overlapping (NOV) design, with respect to arranging relations targeted for training. We conducted a replication evaluation of a Wilshire and Toussaint study, and taught two typically-developing preschoolers compound object-action labels in Spanish and used either an OV or NOV matrix training design. Results from both studies demonstrated the participant trained with an OV design produced recombinative generalization and participants trained with a NOV design produced significantly low levels of emergence or none at all. These results suggest that an OV matrix design facilitates recombinative generalization more effectively than a NOV design. Implications for instructional arrangements are discussed.
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Schmelzer, Thomas. "The fast evaluation of matrix functions for exponential integrators." Thesis, University of Oxford, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.670097.
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MOHANTY, SAMEER. "DECISION MATRIX FOR FUNCTIONAL EVALUATION OF PROJECT MANAGEMENT AUTOMATION." University of Cincinnati / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1152568084.
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Park, Joon-Soo. "Evaluation Methods for Fracture Resistance of Ceramic Matrix Composites." Kyoto University, 2003. http://hdl.handle.net/2433/148648.
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Kyoto University (京都大学)0048
新制・課程博士
博士(エネルギー科学)
甲第10330号
エネ博第66号
新制||エネ||20(附属図書館)
UT51-2003-H751
京都大学大学院エネルギー科学研究科エネルギー応用科学専攻
(主査)教授 香山 晃, 教授 石井 隆次, 教授 落合 庄治郎
学位規則第4条第1項該当
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Contreras, Gerardo Plata. "Evaluation of Stress Intensity Factors in Metal Matrix Composites." Thesis, Oxford Brookes University, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.490495.
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The drive of the aerospace industry to use better materials to save weight and increase the performance of the components has been the principal motive to create new materials like Titanium Metal Matrix Composites (Ti-MMC). The Ti-MMCs were designed to combine high stiffness with low weight. Most aerospace components are exposed to fatigue loads during their operation life, hence extensive research has been carried out to investigate the behaviour of Ti-MMC under fatigue loading. During fatigue of Ti-MMC in four point bend specimens, two cracks grow quazisymmetrical at an angle relative to the normal direction of the notch. It is clear therefore that Mode I and Mode II are present in the specimen. Solutions for predicting the Stress Intensity Factor (SIF) for TI-MMC under these load conditions have not been carried out before and presents difficulties, both analytically and experimentally. Some experimental technique like Stereo-Imaging Technique (Sin, Scanning electron microscope (SEM), Laser interferometry displacement gage system and mechanical extensometer have been used to calculate the SIF in Ti-MMC specimens by measuring the Crack Open Displacement COD during the fatigue crack propagation, but these technique have limited measuring capabilities. However, the Moire interferometry technique gives very sensitive and detailed data, due to its ability to measure the full field displacements near the crack tip. Moire Interferometry was applied in this thesis to calculate KI and KII using different analytical methods, for fatigue crack growth in unidirectional Metal Matrix Composite. The composite considered was Textron SCS-6ffi-6-4 and the bend was carried out in four point bending at room temperature. Zero load ratio and four different load ranges were considered. Two finite element models were also developed to predict the crack path direction and to calculate the SIFs. The results obtained from FE models and from the experimental technique show good correlation. The experimental results though show that the SIFs do not reduce in a linear manner but have several stages of crack retardation which is believed to be due to fibres becoming active in bridging behind the crack tip. The results presented are unique in that very little data on SIFs in Ti-MMC material is available and the effect of off-axis cracks on the KI and KII SIFs has not been addressed until now.
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Scholtz, Reginald. "The manufacturing performance measurement matrix model." Thesis, Stellenbosch : Stellenbosch University, 2008. http://hdl.handle.net/10019.1/969.
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Thesis (MBA (Graduate School of Business))--Stellenbosch University, 2008.ENGLISH ABSTRACT: Globalisation, constant innovations and well-informed customers have made modern business environments dynamic and complex. Organisations, with their ever-changing business models, are striving to improve the quality of their products and services. Congruently, several management theories have evolved. Total Quality Management (TQM),Just in Time (JIT), Benchmarking, Lean Management, Balanced Scorecard and Six Sigma are some of the more well known. Each movement with its own life span, its share of popularity and level of acceptance has the same basic goal – improvement in quality by measuring performance. Recent years have seen an upsurge in the approaches and contributions to the field of performance measurement. Are these management theories just a flavour of the month or do they add value. The object of this study is to provide industry specific manufacturing business with a Manufacturing Performance Measurement Matrix Model, which can be used over time to measure improvement and serve as a basis for Knowledge Management.
AFRIKAANSE OPSOMMING: Globalisering, konstante inbring van veranderinge en goed ingeligte kliënte het die moderne besigheidsomgewing dinamies en kompleks gemaak. Organisasies, met hulle ewig veranderende besigheidsmodelle, streef daarna om die kwaliteit van hulle produkte en dienslewering te verbeter. Verskeie bestuursteorieë het as gevolg hiervan ontwikkel. Die mees bekende bestuursteorieë is onder andere: Total Quality Management (TQM), Just in Time (JIT), Benchmarking, Lean Management, Balanced Scorecard en Six Sigma. Elkeen van hierdie planne, met sy eie leeftyd, porsie van die gewildheid en vlak van aanvaarding, het dieselfde basiese doel – verbetering van kwaliteit deur die meet van prestasie. Onlangse jare het ‘n opvlam gesien in die benaderings en bydraes tot die veld van prestasiemeting. Is hierdie bestuursteorieë net ‘n nuutjie of is hulle waardevol vir die besigheidswêreld? Die doel van hierdie studie is om industrie spesifieke vervaardigingsbesighede met ‘n Vervaardigings Prestasiemetings Matriks Model te voorsien wat deur die verloop van tyd verbeterings kan meet en kan dien as ‘n basis vir die bestuur van kundigheid.
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Wallstedt, Maria. "Evaluation of blood interactions with a drug loaded protein matrix." Thesis, Linköpings universitet, Tillämpad Fysik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-68306.
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Many things might happen in the body when a titanium implant is inserted into bone. Examples are activation of the immune system and imbalance between bone formation and bone resorption, which might lead to damaged bone around the implant and at worse, loosening of the implant. Bisphosphonates, BP’s, is a class of drugs that is able to decrease the osteoclast (bone resorption cell) activity and thereby strengthen the bone. FibMat2.0 is a fibrinogen matrix and consists of a thin protein layer which can be applied on an implant and act as a local drug delivery system. The work in this thesis was divided into two parts where aim of the first part was to study FibMat2.0 with integrated BP’s, and their effect in the presence of blood. The aim for the second part was to determine whether it was possible to incorporate antithrombotic drugs into the fibrinogen matrix. No detection method for the amount of drugs incorporated into the fibrinogen matrix was used but the fact that the drugs gave effect was verifying that it is possible to integrate other drugs than BP’s into FibMat2.0. Methods that have been used in the experiments in presence of blood are imaging of coagulation, fluorescence microscopy and cone-and-plate. For the first part, the results showed that surfaces incubated with fibrinogen and fibrinogen with integrated BP’s act alike in regard to coagulation and platelet adhesion. Compared to titanium, which is known to be a biocompatible material, the surfaces with fibrinogen and fibrinogen with BP’s behave similar in regard to platelet adhesion. When it comes to coagulation, the surfaces coated with fibrinogen with or without an addition of BP’s have shown a longer coagulation time compared to the clean titanium surface. For the second part, some conclusions have been drawn according to the results. Heparin and hirudin have shown anticoagulant effects when integrated in the matrix. The platelet inhibitor cangrelor seemed to have better effect when added in blood and incubated compared to incubation with the platelet inhibitor on the surface before incubation in blood. Finally, when combining heparin and cangrelor, very clear differences in regard to formation of fibrin network could be seen. It seems promising to be able to load different kind of drugs in FibMat2.0.
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Jere, Deepali G. Cooper Lyndon F. "Evaluation of a biopolymer matrix for cell based bone repair." Chapel Hill, N.C. : University of North Carolina at Chapel Hill, 2008. http://dc.lib.unc.edu/u?/etd,1609.
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Thesis (M.S.)--University of North Carolina at Chapel Hill, 2008.Title from electronic title page (viewed Sep. 16, 2008). "... in partial fulfillment of the requirements for the degree of Master of Science in the Department of Prosthodontics School of Dentistry." Discipline: Prosthodontics; Department/School: Dentistry.
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Trandel, Barbara Dawn. "Nondestructive evaluation of a high temperature ceramic matrix composite material." Thesis, This resource online, 1995. http://scholar.lib.vt.edu/theses/available/etd-01312009-063125/.
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Molignano, Jennifer Elizabeth. "Evaluation of a Novel Electrospun Polymer Dermal Regeneration Composite Matrix." Digital WPI, 2013. https://digitalcommons.wpi.edu/etd-theses/1324.
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Bioengineered skin is a promising treatment for chronic skin wounds because of its ability to promptly promote wound healing at the injury site and to restore the skin’s epidermal and dermal structures and functions. Despite some level of clinical success, commercially available bioengineered skin substitutes are still limited by a high incidence of infection, a lack of mechanical integrity, and a slow rate of tissue ingrowth from the surrounding wound margin. To address these challenges, we propose to engineer novel polymer composite matrices for dermal regeneration. These matrices consist of two different electrospun polymer layers which create a composite matrix made up of a highly porous three-dimensional fibrous network. Each composite matrix contains a biodegradable electrospun “dermal” layer which acts as a scaffold for dermal cell ingrowth and tissue regeneration and a non-degradable electrospun “epidermal” layer that serves as a provisional barrier to protect the wound from environmental insult. To evaluate the success of our designs, we performed quantitative analyses of the physical properties of our electrospun scaffolds including fiber diameter and angle analyses and mechanical properties. We found our electrospun scaffolds are comprised of a random network of fibers ranging from approximately 0.2 – 5µm in diameter. They exhibit several mechanical properties that are similar to those measured in native skin tissue, including tangent elastic modulus and strain at failure. We have also found the proposed nanofibrous scaffolds to be capable of supporting normal human fibroblast attachment and migration. Our scaffolds show similar attachment to tissue culture polystyrene controls and better attachment than collagen-GAG sponge controls. The dermal layer of our scaffolds show fibroblast outgrowth rates between 185 - 206µm/day, which is similar to rates observed by others in collagen-GAG sponges and wounds. The promising findings from these in vitro studies warrant that our novel electrospun dermal regeneration matrix be further developed.
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Durham, Rebecca. "An Evaluation of Effectiveness and Efficiency of Matrix Training Permutations." Thesis, University of North Texas, 2020. https://digital.library.unt.edu/ark:/67531/metadc1703398/.
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Recombinative generalization is a generative outcome that involves responding to novel stimulus combinations, and it can be facilitated through an instructional approach called matrix training. A learner's history with constituent stimuli and the arrangement of combination stimuli within the instructional matrix may affect the likelihood of recombinative generalization. To investigate this further, the current project assessed recombinative generalization with novel combinations of abstract stimuli by programming specific training histories for undergraduate student participants. The matrix training conditions were: (a) trained constituents with overlap training, (b) untrained constituents with overlap training, (c) trained constituents with nonoverlap training, and (d) untrained constituents with nonoverlap training. We evaluated whether and the extent to which recombinative generalization occurred in each matrix training condition in comparison to a condition that included training the constituents and providing a word-order rule. Finally, we compared the training trials in experimental conditions to directly training all constituents and combinations. The results suggested both overlap conditions and the trained constituents with nonoverlap condition produced recombinative generalization, and the trained constituents with nonoverlap condition was the most efficient. These results could inform the training order and stimulus arrangements practitioners employ to program for recombinative generalization.
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Draganoiu, Elena S. "Evaluation of kollidon⁰ SR for pH-independent extended release matrix systems." Cincinnati, Ohio : University of Cincinnati, 2003. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=1054756192.
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Sabat, Philippe Jacques. "Evaluation of fiber-matrix interfacial shear strength in fiber reinforced plastics." Thesis, Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/77733.
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The role of the interphase in fiberglass reinforced composites was studied by a combination of theoretical analysis, mechanical tests, and several high-resolution analytical techniques. The interphase was varied in composition by using epoxy and polyester matrix polymers with and without added coupling agents, as well as four fiber surface modifications. Different coupling agents on the fibers were shown to change the fiber tensile strength markedly. Filament wound unidirectional composites were tested in short beam "shear." Corresponding samples were fabricated by embedding one to seven fibers in the center of polymer dogbone specimens that were tested in tension to determine critical fiber lengths. Those values were used in a new theoretical treatment (that combines stress gradient shear-lag theory with Weibull statistics) to evaluate "interfacial shear strengths". The fact that results did not correlate with the short beam data was examined in detail via a combination of polarized light microscopy, electron microscopy (SEM) and spectroscopy (XPS or ESCA) and mass spectroscopy (SIMS). When the single fiber specimens were unloaded, a residual birefringent zone was measured and correlated with composite properties, as well as with SIMS and SEM analysis that identified changes in the locus of interphase failure. Variations in the interphase had dramatic effects upon composite properties, but it appears ·that there may be an optimum level of fiber-matrix adhesion depending upon the properties of both fiber and matrix. Fiber-fiber interactions were elucidated by combining tensile tests on multiple fiber dogbone specimens with high-resolution analytical techniques. In general, this work exemplifies a multidisciplinary approach that promises to help understand and characterize the structure and properties of the fiber-matrix interphase, and to optimize the properties of composite materials.Master of Science
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Ganpatye, Atul Shridatta. "Ultrasonic ply-by-ply detection of matrix cracks in laminated composites." Thesis, Texas A&M University, 2004. http://hdl.handle.net/1969.1/1327.
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In the design of cryogenic fuel tanks for the next generation Reusable Launch Vehicles (RLVs), the permeability of liquid hydrogen (LH2) across the thickness of the tank is a critical issue. The rate of permeation of LH2 is largely dependent on the internal damage state of the composite tank wall. Damage in the form of matrix cracks in the composite material of the tank is responsible for the through-the-thickness permeation of LH2. In this context, the detection of matrix cracks takes on an unprecedented significance. In this work, an ultrasonic technique for the ply-by-ply detection of matrix cracks in laminated composites is developed. Experimental results are presented for graphite/epoxy laminates with different lay-ups and laminate thicknesses. Matrix cracks in each of the plies of the laminated composites were detected even when there was a rather high density of cracks in all of the plies. The ultrasonic data were calibrated by comparing them with the corresponding results obtained by using the traditional methods of optical microscopy and penetrant enhanced X-radiography. Excellent quantitative correlation was observed between the results obtained with ultrasonics and the traditional methods.
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Silva, Vitor Paulo Andrade da. "Application of solid-phase microextraction technique to the determination of pesticides and evaluation of matrix effect on water." Universidade Federal do CearÃ, 2013. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=16812.
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CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel SuperiorThis paper investigates a strategy as a quality control parameter, using standard surrogate and determination of an relation factor (Rf) for determination of pesticides parathion-methyl, chlorpyrifos and cypermethrin in aqueous environmental matrices with different characteristics: river water, estuarine, seawater and weir, using technique SPME-GC-FID. Pesticides were susceptible to matrix effects promoted by environmental samples. A decrease in recovery was observed for the pesticide while the complexity of the aqueous matrix tends to increase. The salinity and organic matter appear to be major sources of interference in the method. To the methyl-parathion, the matrix effect was more pronounced for samples with higher salt concentrations. For chlorpyrifos, in medium and high levels, the Rf value for estuarine matrices, marine and weir were statistically similar. For cypermethrin, statistical equality occurred in estuarine headquarters in medium and high levels of concentration. This indicates proportional behavior between the pesticide and the standard surrogate, suggesting that a single value of Rf can be used as a correction factor for any of these matrices used.
Este trabalho investiga uma estratÃgia como parÃmetro de controle de qualidade, usando padrÃo surrogate e determinaÃÃo de um fator de relaÃÃo (Rf) para a determinaÃÃo dos pesticidas metil-paration, clorpirifÃs e cipermetrina em matrizes ambientais aquosas com distintas caracterÃsticas: Ãgua de rio, estuÃrio, marinha e de aÃude; usando a tÃcnica de SPME-GC-FID. Os pesticidas foram suscetÃveis ao efeito matriz promovido pelas amostras ambientais. Observou-se que esse efeito tendeu a aumentar com o aumento da complexidade da matriz. A salinidade e a matÃria orgÃnica parecem ter sido as principais fontes de interferÃncia no mÃtodo. Para o metil-paration, as amostras com maiores teores salinos exerceram efeito matriz mais pronunciado. Para o clorpirifÃs, em nÃveis mÃdio e alto, o valor de Rf para matrizes estuarina, marinha e de aÃude foram estatisticamente similares. Para a cipermetrina, a igualdade estatÃstica ocorreu em matrizes estuarinas em nÃveis mÃdios e altos de concentraÃÃo. Isso indica comportamento proporcional entre o pesticida e o padrÃo surrogate, sugerindo que um Ãnico valor de Rf pode ser usado como fator de correÃÃo para qualquer uma dessas matrizes utilizadas.
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Craft, Jason Scott. "Evaluation of advanced titanium matrix composites for 3rd generation reusable launch vehicles." Thesis, Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/17644.
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Armour, Alexis Devon. "Evaluation of porcine acellularized dermal matrix as a biomaterial, in vitro fibroplasia." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/MQ63144.pdf.
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Ost, Alexander. "Performance of communication systems : a model based evaluation with matrix geometric methods /." Berlin ; Heidelberg [u.a.] : Springer, 2001. http://swbplus.bsz-bw.de/bsz090497023inh.htm.
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Billson, Jeremy Paul. "The design, synthesis, and evaluation of some conformationally constrained matrix metalloprotease inhibitors." Thesis, University of Exeter, 1997. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.535965.
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Draganoiu, Elena Simona. "Evaluation Of Kollidon® SR for Ph-Independent Extended Release Matrix Systems." University of Cincinnati / OhioLINK, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1054756192.
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Wilshire, Tayla C. "An Evaluation of Matrix Training Approaches for Teaching Compound Labels to Toddlers." Thesis, University of North Texas, 2015. https://digital.library.unt.edu/ark:/67531/metadc801954/.
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Matrix training techniques arrange instruction for stimulus relations that facilitate emergent responding to novel stimulus arrangements, which is a phenomenon known as recombinative generalization. The current study compared two common matrix training approaches, an overlapping (OV) design and a non-overlapping (NOV) design, with respect to arranging relations targeted for training. Two, typically-developing toddlers were taught compound action-object labels in either an OV or NOV matrix training design. Results suggest that an OV matrix design facilitates recombinative generalization more effectively than a NOV design.
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Chiarella-Redfern, Hélène. "Evaluation of MicroRNA Mechanisms Involved in Collagen Matrix Therapy for Myocardial Infarction." Thesis, Université d'Ottawa / University of Ottawa, 2015. http://hdl.handle.net/10393/32084.
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Myocardial infarction (MI), a late-stage event of many cardiovascular diseases (CVD), results in cardiomyocyte death, myeloid cell recruitment to promote cellular debris removal and excessive cardiac remodeling affecting architecture and function, which can ultimately lead to heart failure. Currently, the use of biomaterials to intervene on the hostile post-MI environment and promote myocardial healing is being investigated to restore cardiac function. It has been shown that an injectable collagen matrix improves cardiac repair by altering macrophage polarization, reducing cell death and enhancing angiogenesis, leading to a reduction in infarct size and improved cardiac function when delivered at 3 hours post-MI. MicroRNAs (miRNA) “fine tune” gene expression by negatively regulating the translational output of target messenger RNA (mRNA). As such, miRNAs present interesting therapeutic opportunities for the treatment of MI. However, the delivery of miRNA mimics and/or inhibitors can be complicated by degradation and off target effects. The objectives of this thesis were to determine how the matrix may regulate endogenous miRNAs and to explore the biomaterial’s ability to deliver therapeutic miRNAs. It was shown that matrix treatment of MI mouse hearts resulted in altered expression of 119 miRNAs, some of which had functions linked to the beneficial effects of matrix treatment. Of particular interest, miR-92a was down-regulated within the infarct and peri-infarct cardiac tissue 2 days after matrix treatment (delivered at 3-hours post-MI) compared to PBS treatment. In in vitro cultures, the matrix down-regulated miR-92a levels in macrophages but did not significantly alter miR-92a expression in endothelial cells, circulating angiogenic cells or fibroblasts. In addition, using an in vitro model system, it was shown that the matrix may have the potential to deliver functional therapeutic miRNAs to cells; however further experimental optimisation is required to confirm these results. Therefore, collagen matrix treatment may be a promising approach to regulate and/or deliver miRNAs for protecting the myocardial environment and improving function of the infarcted heart.
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Jacobsson, Lena. "Evaluation of Novel Materials for Wound Healing." Thesis, Linköping University, Department of Physics, Chemistry and Biology, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-16592.
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Rapid wound healing is important to regain the skins protective function after injury. Studies have shown that enamel matrix proteins (EMP) have many desirable effects which may accelerate wound healing [Bosshardt et al. 2008].
Polymers (Polymer A, B and C) were formed into a mat form, with or without incorporated enamel matrix derivative (EMD) (Collaboration partner). The materials may be suitable for wound care and drug delivery systems.
Protein release tests were performed on samples incubated in physiological-like solution using pyrogallol red staining, ultraviolet (UV) spectrophotometer and high-performance liquid chromatography (HPLC). Protein was detected in Polymer A material samples, compared to a reference material sample, using pyrogallol red staining. An in vitro experiment showed that normal human dermal fibroblasts (NHDF) cultivated with Polymer A material (with EMD) had significantly higher viability than NHDF cultivated with reference material (Polymer A without EMD) and comparable viability to fibroblasts grown with either 0.1 mg EMD in solution or with 10% fetal calf serum. Images taken of Polymer A material, with incorporated Fluorescein isothiocyanate- (FITC) labeled EMD, indicate a homogenous distribution of EMD peptides and/or EMD aggregates throughout the material. A dressing which contains an active substance may have clinical promise for wound care applications.
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Duarte, Carlos. "Design and Evaluation of Adaptative Multimodal Systems." Doctoral thesis, Department of Informatics, University of Lisbon, 2008. http://hdl.handle.net/10451/14293.
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This thesis focuses on the design and evaluation of adaptive multimodal systems. The design of such systems is approached from an integrated perspective, with the goal of obtaining a solution where aspects related to both adaptive and multimodal systems are considered. The result is FAME, a model based framework for the design and development of adaptive multimodal systems, where adaptive capabilities impact directly over the process of multimodal fusion and fission operations. FAME overviews the design of systems capable of adapting to a diversified context, including variations in users, execution platform, and environment. FAME represents an evolution from previous frameworks by incorporating aspects specific to multimodal interfaces directly in the development of an adaptive platform. One of FAME's components is the Behavioral Matrix, a multipurpose instrument, used during the design phase to represent the adaptation rules. In addition, the Behavioral Matrix is also the component responsible for bridging the gap between design and evaluation stages. Departing from an analogy between transition networks for representing interaction with a system, and behavioral spaces, the Behavioral Matrix makes possible the application of behavioral complexity metrics to general adaptive systems. Moreover, this evaluation is possible during the design stages, which translates into a reduction of the resources required for evaluation of adaptive systems. The Behavioral Matrix allows a designer to emulate the behavior of a non-adaptive version of the adaptive system, allowing for comparison of the versions, one of the most used approaches to adaptive systems evaluation. In addition, the designer may also emulate the behavior of different user profiles and compare their complexity measures. The feasibility of FAME was demonstrated with the development of an adaptive multimodal Digital Book Player. The process was successful, as demonstrated by usability evaluations. Besides these evaluations, behavioral complexity metrics, computed in accordance with the proposed methodology, were able to discern between adaptive and non-adaptive versions of the player. When applied to user profiles of different perceived complexity, the metrics were also able to detect the different interaction complexity
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Brandt, Rasmus. "Polynomial Matrix Decompositions : Evaluation of Algorithms with an Application to Wideband MIMO Communications." Thesis, Uppsala universitet, Signaler och System, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-134389.
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The interest in wireless communications among consumers has exploded since the introduction of the "3G" cell phone standards. One reason for their success is the increasingly higher data rates achievable through the networks. A further increase in data rates is possible through the use of multiple antennas at either or both sides of the wireless links. Precoding and receive filtering using matrices obtained from a singular value decomposition (SVD) of the channel matrix is a transmission strategy for achieving the channel capacity of a deterministic narrowband multiple-input multiple-output (MIMO) communications channel. When signalling over wideband channels using orthogonal frequency-division multiplexing (OFDM), an SVD must be performed for every sub-carrier. As the number of sub-carriers of this traditional approach grow large, so does the computational load. It is therefore interesting to study alternate means for obtaining the decomposition. A wideband MIMO channel can be modeled as a matrix filter with a finite impulse response, represented by a polynomial matrix. This thesis is concerned with investigating algorithms which decompose the polynomial channel matrix directly. The resulting decomposition factors can then be used to obtain the sub-carrier based precoding and receive filtering matrices. Existing approximative polynomial matrix QR and singular value decomposition algorithms were modified, and studied in terms of decomposition quality and computational complexity. The decomposition algorithms were shown to give decompositions of good quality, but if the goal is to obtain precoding and receive filtering matrices, the computational load is prohibitive for channels with long impulse responses. Two algorithms for performing exact rational decompositions (QRD/SVD) of polynomial matrices were proposed and analyzed. Although they for simple cases resulted in excellent decompositions, issues with numerical stability of a spectral factorization step renders the algorithms in their current form purposeless. For a MIMO channel with exponentially decaying power-delay profile, the sum rates achieved by employing the filters given from the approximative polynomial SVD algorithm were compared to the channel capacity. It was shown that if the symbol streams were decoded independently, as done in the traditional approach, the sum rates were sensitive to errors in the decomposition. A receiver with a spatially joint detector achieved sum rates close to the channel capacity, but with such a receiver the low complexity detector set-up of the traditional approach is lost. Summarizing, this thesis has shown that a wideband MIMO channel can be diagonalized in space and frequency using OFDM in conjunction with an approximative polynomial SVD algorithm. In order to reach sum rates close to the capacity of a simple channel, the computational load becomes restraining compared to the traditional approach, for channels with long impulse responses.
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Kumar, Vivek Ashok. "Design and evaluation of scaffolds for arterial grafts using extracellular matrix based materials." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/45869.
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For small diameter (<6 mm) blood vessel replacements, lack of collaterals and vascular disease preclude homografts; while synthetic analogs, ePTFE, expanded polytetrafluoroethylene, and PET, polyethyleneterephathalate, are prone to acute thrombosis and restenosis. It is postulated that the hierarchical assembly of cell populated matrices fabricated from protein analogs provides a new design strategy for generating a structurally viable tissue engineered vascular graft. To this end, synthetic elastin and collagen fiber analogs offer a novel strategy for creating tissue engineered vascular grafts with mechanical and biological properties that match or exceed those of native vessels. This work details techniques developed for the fabrication of prosthetic vascular grafts from a series of extracellular matrix analogs composed of nanofibrous collagen matrices and elastin-mimetic proteins, with and without cells, and subsequent evaluation of their biocompatibility and mechanical properties. The work details the fabrication and mechanical analysis of vascular grafts made from aforementioned protein analogs. Subesequent studies detail seeding and proliferation of rodent mesenchymal stem cells on protein-based composites to recapitulate the media of native vasculature. Finally detailing in vivo biocompatibility and stability of tissue engineered vascular grafts.
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Vargas-Nordcbeck, Adriana. "Evaluation of the use of reclaimed asphalt pavement in stone matrix asphalt mixtures." Auburn, Ala., 2007. http://repo.lib.auburn.edu/07M%20Theses/VARGAS_ADRIANA_23.pdf.
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Melo, Paola Mejia, Ramos Alexander Linares, Gary Duran Ramirez, and Jose Luis Cardenas Guillen. "Experimental evaluation of matrix suction and shear resistance of partially saturated sandy clay." Institute of Electrical and Electronics Engineers Inc, 2020. http://hdl.handle.net/10757/656563.
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El texto completo de este trabajo no está disponible en el Repositorio Académico UPC por restricciones de la casa editorial donde ha sido publicado.At present, the construction of highways in Andean areas the connect the various most important towns and cities in South America has become has become a key element for its development, since these routes and viaducts allow free access to cover basic needs of education, work, food and health of the population. Much of the land in these areas is clay soils whose behavior is quite unpredictable because they present abrupt volume changes according to the variation of saturation in the soil. People who travel on roads on slopes of this type of soil are at high risk due to the slippage that the slopes suffer each year. The most recent was on April 3, 2020 because of the heavy rainfall that was registered in the area; there was a landslide that affected communication channels in the department of Cajamarca in Peru [1]. In this type of slopes landslides occur when the clayey soil is specifically saturated, because under these conditions the soil is not stable and loses cohesion between its particles, therefore it is important to make slope stability studies taking into account the partially saturated soil. This article presents results of tests allow to recognize the physical characteristics of the clay soil in the province of Chepén in Cajamarca. In addition, the filter paper method is used to elaborate the soil-water characteristic curve and a series of direct shear tests are carried cut at different degrees of saturation. With these results, the partially saturate soil fault surface is constructed that allows visualizing the value of the shear stress of the soil according to the saturation to which it is subjected. This value will be important for calculating the safety factor that the slope floor must have of the resistance shear of the soil according to the saturation, this value will be important for the calculation of the safety factor that the floor of the slope must have so that it does not fall. Therefore, considering this condition of the partially saturated soil in the slope stability analysis provides values of the safety factor that are closer to reality, without the need to carry out the analysis in the most critical condition, such as what it done in classical soil mechanics.
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SRIDHARAN, MAHESH. "EXPLOITING INCREMENTAL SPARSE MATRIX UPDATES TO IMPROVE EVALUATION SPEED OF CONTINUOUS TIME SYSTEMS." University of Cincinnati / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1134584775.
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Quintero, Badillo Jorge R. "Non-destructive Evaluation of Ceramic Matrix Composites at High Temperature using Laser Ultrasonics." University of Cincinnati / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1511800640467908.
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Burrows, Mariana Carvalho. "Evaluation of electrospun PLLA-ECM scaffolds as biomaterials for bone regeneration." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/46/46136/tde-14092016-090552/.
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The extracellular matrix (ECM) is secreted by the host tissue and is an important key for mechanisms of cell responses. The main properties of the ECM materials include biodegradability, biocompatibility, and nanostructured in a 3D fibre network. In addition, ECM is composed of important molecules like growth factors, glycosaminoglycans (GAGs), collagens, fibronectin, and lamin, while final composition depends on the native tissue. We have selected for this study ECMs from cortical bone (B-ECM) and pericardium (P-ECM) tissue. These ECMs were digested by collagenase, pepsin and trypsin. Each of these digested ECMs was used to produce PLLA-ECM based electrospun scaffolds by two different methodologies (1) non-crosslinked (NCLK) hybrid electrospun scaffolds composed of PLLA and digested ECMs and (2) PLLA-collagen electrospun scaffolds crosslinked with digested ECMs (CLK scaffolds). This research proposes the characterization of the digestion promoted by collagenase, pepsin and trypsin on the ECMs, followed by the evaluation of the potential of the digested ECMs and of the PLLA-ECM scaffolds for bone regeneration. The proteinaceous mixture, produced from the ECM digestion, had compositions, which were dependent on the type of ECM, and on the enzymatic treatment, as shown by protein quantification, GAGs quantification, TGA, SDS-page and TPEF-SHG. All the results point to an extensive digestion caused by collagenase and pepsin and a milder digestion caused by trypsin. The digested ECMs were incorporated into nanofibrous scaffolds, and the products were characterized by SEM, TGA, DSC and TPEF-SHG. The porous nanofibrous mesh from non-crosslinked scaffolds exhibited fibres without beads and a uniform diameter. However, the crosslinked scaffolds presented non-organized agglomerates around the fibres making a less porous surface. TGA and DSC suggest the incorporation of the ECMs on the scaffolds. However, the distribution of the protein on the polymer was mostly dependent on the incorporation method, as showed by TPEF-SHG. To access the biomaterial ability for bone regeneration, bone marrow mesenchymal stem cells (BMMSCs) were cultured on the scaffolds over 21 days. Osteogenic markers such as ALP activity, mineral nodule formation by ARS staining, col1a2 immunostaining, and gene expression were analysed to access how the materials could induce BMMSCs osteodifferentiation. Comparing NCLK to CLK scaffolds the key factor for osteogenesis is the release of soluble factors, showing NCLK scaffolds with a higher ability to induce mineralization than CLK scaffolds. However, when comparing the effect of the enzymatic digestion on the mineralization of the scaffolds over the days, it is possible to establish that the effect of the enzymatic treatment is also related to the type of ECM. Despite all those differences, some PLLA-ECM scaffolds exhibited potential to induce earlier mineralization, observed by the analysis of bglap, runX2, Osx, sparc and col1a2 genes as osteogenic markers.A matriz extracelular (ECM) é secretada pela células no tecido nativo e reúne propriedades chave para respostas celulares. Entre suas principais propriedades destacam-se: biodegradabilidade, biocompatibilidade e nanoestruturada tridimensionalmente. Além disso, é rica em sinalizadores celulares tais como: fatores de crescimento, glicosaminaglicanas (GAGs), colágeno, fibronectina e laminina, no entanto sua composição depende do tecido na qual se encontra. Para este estudo, foram selecionadas ECMs provenientes de osso cortical e de pericárdio. Estas ECMs foram digeridas por colagenase, pepsina e tripsina. Cada um dos produtos de digestão foi utlizado para a produção de suportes eletrofiados de PLLA-ECM, utilizando-se dois diferentes métodos de incorporação, (1) Suportes eletrofiados híbridos de PLLA-ECM obtidos a partir da eletrofiação da co-solução em 1,1,1,3,3,3-hexafluor-2-propanol, e (2) imobilização das ECM digeridas sobre suportes eletrofiados de PLLA-colágeno. O presente trabalho propõe-se a caracterizar as ECMs digeridas e a avaliar o potencial dos suportes eletrofiados de PLLA-ECM para a regeneração óssea. A mistura proteinácea obtida a partir da digestão das ECMs, mostrou que a sua composição é dependentes do tipo de ECM e da digestão enzimática, resultado este confirmado através da quantificação de proteínas, quantificação de glicosaminoglicanas, TGA, SDS-page e TPEF-SHG. A partir destes, foi observada que a colagenase é a enzima que promove a maior degradação das ECMs, enquanto que a tripsina promove uma degradação em menor escala. As matrizes digeridas foram incorporadas no material nanoestruturado, estes foram caraterizados por SEM, TGA, DSC e TPEF-SHG. Observou-se que a malha eletrofiada a partir da co-solução de PLLA-ECM exibiu a formação de fibras de diâmetro uniforme, enquanto que os suportes imobilizados apresentaram a formação de aglomerados sólidos ao redor das fibras, originando uma malha menos porosa. As análises de TGA e DSC confirmaram a incoporação das ECMs nas malhas eletrofiadas, e através da técnica de TPEF-SHG observou-se a distribuição das proteinas no polímero. O potencial dos materiais para a regeneração óssea foi avaliado através da cultura de células tronco mesenquimais de medula óssea sobre os suportes eletrofiados durante 21 dias, e em seguida, medidas de ALP, quantificação de coloração com vermelho de alizarina, imunofluorescência com anticorpo col1a2, e expressão de gênica foram analisadas para a avaliação de como os materiais eletrofiados de PLLA-ECM induzem a osteodiferenciação. Comparando-se materiais produzidos por co-solução e os materiais imobilizados foi possível observar que a resposta osteogênica é maior nos materiais híbridos devido a liberação de fatores solúveis dos suportes eletrofiados. No entanto, comparando-se o efeito da digestão enzimática na capacidade de mineralização dos suportes , é possível observar que o efeito da digestão enzimática é dependente do tipo de ECM. Em geral, foi possível observar que os suportes eletrofiados de PLLA-ECM exibem potencial para uso em engenharia de tecidos, em específico, regeneração óssea, uma vez que apresentaram-se regulados o conjunto de genes bglap, RunX2, Osx, sparc e col1a2.
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Åberg, Maria. "Skill and knowledge matrix and evaluation tool for CAD-users at Atlas Copco Rock Drills AB." Thesis, Örebro University, School of Science and Technology, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-10017.
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Van, Duyn Lee B. "Evaluation of the Mechanical Behavior of a Metal-Matrix Dispersion Fuel for Plutonium Burning." Thesis, Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/5303.
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Recent nuclear proliferation concerns and disarmament agreements have encouraged the U.S. to decrease the excess amount of weapons-grade and reactor-grade plutonium. Continued use of nuclear power without a permanent solution for waste disposition has also led to the need for a reliable method by which the waste products, specifically plutonium, can be utilized or destroyed. One possible solution to plutonium destruction is achieved by manufacturing it into small microspheres and embedding it within an inert metal matrix, then placing it inside a conventional nuclear reactor. This process would burn some of the plutonium while producing electricity. PuO2Zr dispersion fuel has been proposed for such a purpose. Prior to its use, however, this non-fertile metal matrix dispersion fuel must be shown to be mechanically stable in the reactor environment.
The internal mechanical interactions of dispersion fuel were modeled using finite element analysis. The results were used to assess the stability of PuO2Zr dispersion fuel inside a reactor. Several parameters, including fuel particle size, volumetric loading, temperature, and burnup, were varied to determine the maximum amount of plutonium that can be burned while maintaining fuel integrity. Earlier experiments using UO2 stainless steel dispersion fuels were used to validate the model and establish a failure criterion. The validated model was then used to determine the parameter space over which PuO2Zr dispersion fuel can be successfully used. These results show that PuO2Zr dispersion fuel is robust and may offer a reliable method for plutonium disposal in current reactors.
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Keser, Nilay. "Production And Performance Evaluation Of Zif-8 Based Binary And Ternary Mixed Matrix Membranes." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614571/index.pdf.
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Mixed matrix membranes (MMMs) have gained importance because they combine the desirable
properties of the polymers and the organic/inorganic filler materials and they may have a very big
potential. In this study polyethersulfone (PES) was used as polymeric material, and Zeolitic
Imidazolate Framework-8 (ZIF-8) was used as porous filler material, and 2-hydroxy 5-methyl
aniline(HMA), was used as a third component in membrane formulation.
In this study, ZIF-8 crystals were synthesized with varying particle sizes, and a novel recycling
methodology was developed to improve the efficiency of ZIF-8 production. ZIF-8 nano-crystals were
synthesized by a 1-hour stirring method at room temperature and characterized by X-ray
diffractometer, scanning electron microscopy (SEM), transmission electron microscopy (TEM),
dynamic light scattering (DLS) and thermal gravimetric analysis (TGA). In order to investigate the
effect of ZIF-8 loading on the membrane performance, different types of membranes were prepared
with varying amounts of ZIF-8 between 10-60% (w/w). Moreover, ternary mixed matrix membranes
were synthesized consisting of different amounts of ZIF-8 between 10-30% (w/w) and HMA 1-10%
(w/w). Gas transport properties of the membranes were investigated by single gas permeation
experiments of H2, CO2 and CH4 at 3 bar feed pressure. In order to investigate the effect of feed
pressure on the gas transport properties of the membranes, single gas experiments were conducted on
3, 6, 8, 10 and 12 bar feed pressures. Moreover, binary gas permeation experiments of CO2/CH4 pair
were conducted through selected membranes at 3 bar and 12 bar feed pressures. In addition to gas permeation experiments, the morphology and thermal characteristics of the membranes were
characterized by SEM, TGA and differential scanning calorimetry (DSC) analysis.
The incorporation of ZIF-8 crystals into continuous PES matrix resulted in high performance gas
separation membranes. The permeabilities of all studied gases increased with ZIF-8 loading while the
ideal selectivities showed a slight decrease compared to neat PES membrane. Highly reproducible and
repeatable results were obtained up to 30 % w/w ZIF-8 loading, while membrane formulation
reproducibility was decreased for higher ZIF-8 contents (>30 w/w %). Addition of HMA improved the gas separation performances of the binary membranes significantly by decreasing permeabilities and increasing ideal selectivities. PES/ZIF-8(%20)/HMA(%7) membrane has the best separation performance for all gases among the ternary membranes. When 7 w/w % HMA was added to PES/ZIF-8(%20) membrane, H2 permeability decreased from 26.3 to 13.7 barrer, while H2/CH4 ideal selectivity increased from 61.8 to 103.7. Increasing feed pressures appreciably increased the separation performances of all membranes. While the H2 permeability is pressure independent, the CO2 and CH4 permeabilities were reduced with increasing feed pressures and the highest selectivity improvement was observed in H2/CH4 pair for all membrane compositions. For instance, when the feed pressure was increased from 3 bar to 12 bar, the percentage improvements in ideal selectivities through PES/ZIF-8(%10)/HMA(%4) membrane were calculated as 26, 69, 113 % for the H2/CO2, CO2/CH4 and H2/CH4 gas pairs
respectively. This results show that working at higher feed pressures will be more advantageous for separation of the studied gas pairs. The ideal selectivities and the separation factors were equal to each other for all membrane compositions both for 3 and 12 bar operating pressures.
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Sridharan, Mahesh. "Exploiting incremental sparse matrix updates to improve the evaluation speed of continuous time systems." Cincinnati, Ohio : University of Cincinnati, 2005. http://www.ohiolink.edu/etd/view.cgi?acc%5Fnum=ucin1134584775.
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Kale, Atul. "Evaluation of red-cockaded woodpecker habitat using a red-cockaded woodpecker foraging matrix application." Connect to this title online, 2008. http://etd.lib.clemson.edu/documents/1219848445/.
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Läufle, Rebecca. "Evaluation eines Matrix-Systems zur Klassifikation von Mikroverkalkungen in Mammographien eine "Multi-Reader"- Studie /." [S.l. : s.n.], 2008.
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Zantout, B. "The production and evaluation of squeeze cast Al-alloy matrix-short ceramic fibre composites." Thesis, Loughborough University, 1986. https://dspace.lboro.ac.uk/2134/22082.
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Research work on metal matrix-fibre composites has concentrated in the past on aligned fibre composites. The poor transverse strength of these composites is seen as a major hindrance to their practical use in the majority of engineering applications because stresses exist in more than one direction. Materials with isotropic properties are preferred and consequently reinforcement of composites in three dimensions will be necessary. With this objective, an investigation was conducted to assess the method of fabrication and properties of A1-a110y reinforced with short fibres (SiC and A1 203) randomly oriented in three dimensions. Two composite systems were examined: Al-4.S Cu alloy reinforced with SiC fibre; and Al-3.7S Mg alloy reinforced with A1 203 fibre. The general approach was to establish a satisfactory manufacturing method for the composites before evaluating their mechanical properties. The vortex technique was used to introduce the fibres into the molten alloy. Pre-treatment of the fibres, to induce wetting, and the use of a specially designed device for fibre separation and introduction to the molten A1-ai10ys was found to be necessary so that a uniform distribution of fibres oriented in three dimensions could be achieved. The composites were squeeze cast, under conditions which were experimentally determined, to ensure the production of pore-free castings with fine equiaxed structures. The improvement in tensile strength and ductility of the cast metal, provided by squeeze casting, would be beneficial to composite properties. Composite castings, with up to 10% volume fibre, were produced with a sound structure and with fibres that were uniformly distributed and randomly oriented in three dimensions. It was found that the reaction between the fibres and the respective molten alloy must be closely controlled so that fibre reinforcement can be realised. In this respect the optimum time of contact between the fibres and the molten alloy was experimentally defined for both composite systems. The tensile properties (UTS, 0.1% proof stress, and ductility) of the fibre-free alloys were substantially improved by squeeze casting. The addition of fibre produced further substantial improvement in the tensile properties of the squeeze cast composites, in particular elastic modulus and 0.1% proof stress. Furthermore, composite properties were isotropic. The improvement in the tensile properties of composite castings (as a result of the addition of fibre) was maintained at elevated temperatures. At 250oC, castings of both composite systems with 10% (volume) fibre had 0.1% proof stress and elastic modulus values similar to those for the fibre-free castings at room temperature. The tensile properties of the composite castings were not affected by thermal cycling (at experimental conditions). The fatigue life of the squeeze cast composite was substantially improved over and above the initial improvement in fatigue life of the fibre-free castings produced by squeeze casting. Wear of cutting tools was adversely affected by the presence of fibres.
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Swaminathan, Ganesh. "Evaluation Of Adult Stem Cell Derived Smooth Muscle Cells For Elastic Matrix Regenerative Repair." University of Akron / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=akron1462209321.
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Pierson, Sofia Gottlieb. "Codeswitching in Hiaki Conversational Discourse: An Evaluation of Myers-Scotton's Matrix Language Frame Model." Oberlin College Honors Theses / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=oberlin149570804750898.
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Clark, Brett W. "The Development and Evaluation of the knife Finite Element." BYU ScholarsArchive, 1996. https://scholarsarchive.byu.edu/etd/3456.
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This thesis presents the development and evaluation of the knife finite element which is a degenerate case of a hexahedral element. The knife connectivity is an artifact of automatic all-hexahedral mesh generators. Currently, knives are propagated to the surface of the mesh for removal. However since this disturbs the surface mesh, other alternatives are needed. This thesis investigates the option of leaving the knife connectivity in the mesh and treating it as a valid finite element. The shape functions and stiffness matrix for the knife element are derived and evaluated using theoretical and practical evaluations. It is concluded that the knife finite element is a viable element and should be used in finite element analysis when the knife connectivity occurs. Using the knife element reduces the work involved with fixing the knife connectivity by propagation or other means and will produce acceptable results in most cases.
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Giordano, Céline. "Pre-Clinical Evaluation of Biopolymer Delivered Circulating Angiogenic Cells in Hibernating Myocardium." Thèse, Université d'Ottawa / University of Ottawa, 2011. http://hdl.handle.net/10393/20619.
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Vasculogenic cell-based therapy combined with tissue engineering is a promising revascularization strategy for patients with hibernating myocardium, a common clinical condition. We used a clinically relevant swine model of hibernating myocardium to examine the benefits of biopolymer-supported delivery of circulating angiogenic cells (CACs) in this context.
Twenty-five swine underwent placement of an ameroid constrictor on the left circumflex artery (LCx). After 2 weeks, positron emission tomography measures of myocardial blood flow (MBF) and myocardial flow reserve (MFR) were reduced in the affected region (both p<0.001). Hibernation (mismatch) was specific to the LCx territory. Swine were randomized to receive intramyocardial injections of PBS control (n=10), CACs (n=8), or CACs + a collagen-based matrix (n=7). At follow-up, stress MBF and MFR were increased only in the cells+matrix group (p<0.01), and mismatch was lower in the cells+matrix treated animals (p=0.02) compared to controls. Similar results were found using microsphere-measured MBF. Wall motion abnormalities and ejection fraction improved only in the cells+matrix group.
This preclinical swine model demonstrated ischemia and hibernation, which was improved by the combined delivery of CACs and a collagen-based matrix. To our knowledge, this is the first demonstration of the mechanisms and effects of combining progenitor cells and biopolymers in the setting of myocardial hibernation, a common clinical condition in patients with advanced coronary artery disease.
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TILLOTSON, JOHN KING. "DEVELOPMENT AND EVALUATION OF EXTENDED-RELEASE BUMETANIDE TABLETS." University of Cincinnati / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1085067185.
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Breunig, Thomas M. "Nondestructive evaluation of damage in SiC/Al metal matrix composite using x-ray tomographic microscopy." Diss., Georgia Institute of Technology, 1992. http://hdl.handle.net/1853/19999.
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Asaadi, Shima [Verfasser], Sebastian [Gutachter] Rudolph, and Michael [Gutachter] Roth. "Compositional Matrix-Space Models : Learning Methods and Evaluation / Shima Asaadi ; Gutachter: Sebastian Rudolph, Michael Roth." Dresden : Technische Universität Dresden, 2020. http://d-nb.info/1231846348/34.
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Eriksson, Viktor. "Evaluation of Decentralized Information Matrix Fusion for Advanced Driver-Assistance Systems in Heavy-Duty Vehicles." Thesis, KTH, Optimeringslära och systemteori, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-191993.
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Advanced driver-assistance systems (ADAS) is one of the fastest growing areas of automotive electronics and are becoming increasingly important for heavy-duty vehicles. ADAS aims to give the driver the option of handing over all driving decisions and driving tasks to the vehicle, allowing the vehicle to make fully automatic maneuvers. In order to perform such maneuvers target tracking of surrounding traffic is important in order to know where other objects are. Target tracking is the art of fusing data from different sensors into one final value with the goal to create an as accurate as possible estimate of the reality. Two decentralized information matrix fusion algorithms and a weighted least-squares fusion algorithm for target tracking have been evaluated on two simulated overtaking maneuvers performed by a single target. The first algorithm is the optimal decentralized algorithm (ODA), which is an optimal IMF filter, the second algorithm is the decentralized-minimum-information algorithm (DMIA), which approximates the error covariance of received estimates, and the third algorithm is the naïve algorithm (NA), which uses weighted-least-squares estimation for data fusion. In addition, DMIA and NA are evaluated using real sensor data from a test vehicle. The results are generated from 100 Monte Carlo runs of the simulations. The error of position and velocity as well as the their corresponding root-mean-squared-error (RMSE) are smallest for ODA followed by NA and DMIA. ODA gives consistent estimators for the first simulated overtaking but not the second. DMIA and NA are not statistically significant on a 95 % level. The robustness against sensor failures shows that ODA is robust and yields similar results to the simulations without sensor failures. DMIA and NA are sensitive to sensor failures and yield unstable results. ODA is clearly the best option to use for sensor fusion in target tracking.Avancerade förarsystem (ADAS) är en av de snabbast växande områdena inom fordonselektronik och blir mer och mer viktigt även för lastbilar. ADAS riktar sig till att ge föraren möjligheten att låta fordonet ta beslut om köningen och utföra autonoma manövrar. För att kunna utföra sådana manövrar krävs objektföljning av omkringvarande fordon. Sensorfusion inom objektföljning är tekniken att kombinera data från olika sensorer till ett värde med målet att skapa en så precis skattning av verkligheten som möjligt. Två decentraliserade informationsmatris-fusions algoritmer och en viktad minsta- kvadrat fusions algoritm för objektskattning har blivit utvärderade utifrån två simulerade omkörningar utförda av ett enskilt objekt. Den första algoritmen är optimal decentralized algorithm (ODA), som är ett optimalt informationsmatris-fusions fil- ter, den andra algoritmen är decentralized-minimum-information algorithm (DMIA), som approximerar kovariansmatrisen av residualerna från mottagna skattningar, samt den tredje algoritmen är naïve algorithm (NA), som kombinerar data från sensorerna med hjälp av viktad minsta-kvadrat fusion. Utöver detta är DMIA och NA även utvärderade på riktig sensordata från ett testfordon. Resultaten är genererade från 100 Monte Carlo körningar av simuleringarna. Residualerna för position och hastighet samt minsta-kvadrat felet är minst för ODA följt av NA och DMIA. ODA ger konsistenta skattningar under den första simulerade omkörningen men inte under den andra omkörningen. DMIA och NA är inte kon- sistenta på en 95 % signifikansnivå under någon av omkörningarna. ODA är robust och ger liknande resultat i simuleringarna med och utan sensorfel. DMIA och NA är känsliga mot sensorfel och ger instabila resultat. ODA är det klart bästa alternativet för sensorfusion inom objektföljning.
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Abdo, Nawar. "Modularization and evaluation of vehicle’s electrical system." Thesis, KTH, Maskinkonstruktion (Avd.), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-246325.
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Modularization is a strategy used by many companies, to help them provide their customers with a high variety of customized products efficiently. This is done through the customization of different independent modules, which are connected by standardized interfaces that are shared throughoutthe entire module variety. Scania, being one of the large companies that provide modular products, has been successfully improving their modularization concepts for many years, and is one of the most iconic companies when it comes to modularization of buses, trucks and engines. But with the increasing need ofelectronics integrated in the vehicles, it is becoming more and more important to modularize the electrical system. There is currently an existing, modularized, product architecture for the electrical system, and Scania wants to know how well modularized it is, as there is no unified way that indicates what is considered to be the better solution.To analyze the current state of the electrical system, a systematic method of modularization was used, which would help answer three important questions: Are the modules well defined? Is there a way to systematically compare alternative solutions? What criteria are more important to focus on? Since there is no unified way of modularization, many modularization methods have been created, and each one has been optimized for a certain purpose. This project compares three different modularization methods and then uses one of the methods which is deemed to be the preferred method to help provide the answers that the company seeks when investigating the modularity of the electrical system. As the electrical system is very complex, and the project has limited amount of resources, it was decided to choose one of the control units as an example, which was the APS (air processing system). The literature study showed that the most rewarding method to use was the MFD (Module Function Deployment), as it provides more information about the product and what criteria the company should focus on. It was then decided to use the relevant steps in MFD to analyze the state of the APS as an example of how this method works.Modularisering är en strategi som används av många företag, för att hjälpa dem att erbjuda sina kunder en mängd olika anpassade produkter på ett effektivt sätt. Detta görs genom anpassning av olika oberoende moduler, som är kopplade med standardiserade gränssnitt som utnyttjas av alla modulvarianterna. Scania, som är ett av de stora företagen som erbjuder modulariserade produkter, har framgångsrikt förbättrat sina modulariseringskoncept under många år och är ett av de mest ikoniska företagen närdet gäller modularisering av bussar, lastbilar och motorer. Men med det ökande behovet av elektronik integrerad i fordonen blir det allt viktigare att modularisera det elektriska systemet. Det finns för närvarande en befintlig, modulär produktarkitektur för det elektriska systemet, och Scania vill veta hur väl modulariserat det är, eftersom det inte finns något enat sätt som anger vad som anses vara den bättre lösningen. För att analysera det elektriska systemets nuvarande tillstånd, måste en systematisk metod förmodularisering användas, vilket skulle hjälpa till att svara på tre viktiga frågor: Är modulerna väldefinierade? Finns det ett sätt att systematiskt jämföra alternativa lösningar? Vilka kriterier är viktigare att fokusera på? Eftersom det inte finns något enhetligt sätt att modularisera har många modulariseringsmetoder skapats, och var och en har optimerats för ett visst ändamål. I projektet jämförs tre olika modulariseringsmetoder och använder sedan en av de metoder som anses vara den föredragna metoden för att hjälpa till att ge svaren som företaget söker när man undersöker modulariteten hos det elektriska systemet. Eftersom det elektriska systemet är väldigt komplext och projektet har begränsat antal resurser beslutades det att välja en av kontrollenheterna som ett exempel, vilket var APS (luftbehandlingssystem). Litteraturstudien visade att den mest givande metoden att använda var MFD (Module FunctionDeployment), eftersom det ger mer information om produkten och vilka kriterier företaget ska fokusera på. Det bestämdes sedan att använda de relevanta stegen i MFD för att analysera APS tillståndet som ett exempel på hur den här metoden fungerar.
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Maillet, Emmanuel. "Identification des mécanismes d'endommagement et prévision de la durée de vie des composites à matrice céramique par émission acoustique." Thesis, Lyon, INSA, 2012. http://www.theses.fr/2012ISAL0097.
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La durabilité et la fiabilité sont deux facteurs clés dont la maîtrise est essentielle en vue de l’utilisation des composites à matrice céramique (CMC) pour des applications aéronautiques. Il est nécessaire pour cela de pouvoir estimer la durée de vie des structures en service. Cela requiert de quantifier l’endommagement mais aussi d’identifier les différents mécanismes qui en sont à l’origine. Il est donc indispensable d’une part de caractériser les matériaux et de définir les indicateurs d’endommagement les plus adaptés. D’autre part, l’utilisation ou le développement de modèles doivent permettre l’estimation de la durée de vie restante à partir de l’analyse des événements précurseurs associés à la croissance de l’endommagement. L’Emission Acoustique (EA) est une technique qui permet de répondre à cette problématique. En effet, les mécanismes d’endommagement s’accompagnent de libération d’énergie sous forme d’ondes élastiques transitoires. Leur détection, communément appelée émission acoustique, permet de suivre en temps réel le développement de l’endommagement du matériau. Ce moyen est mis en œuvre dans cette thèse qui comporte deux volets complémentaires. Le premier volet porte sur l’identification de la signature acoustique des différents mécanismes impliqués dans l’endommagement des composites à matrice céramique, en vue de permettre une caractérisation fine de la croissance de l’endommagement et de fournir des indicateurs pour la prévision de la rupture. Le second volet porte sur l’estimation de la durée de vie restante sous sollicitation de fatigue statique, à partir de l’émission acoustique en utilisant l’énergie des sources d’EA comme mesure de l’endommagement. Les travaux réalisés dans cette thèse montrent l’apport de l’EA pour l’analyse du comportement mécanique et la prévision de la durée de vie des CMC. Dans le premier volet, la caractérisation robuste des sources d’EA rend possible le suivi en temps réel de l’apparition de chaque mécanisme d’endommagement grâce à une analyse multivariable. Dans le second volet, deux indicateurs, calculables en temps réel, permettent d’identifier deux phases reproductibles dans le comportement des CMC sollicités en fatigue statique, à partir de la libération d’énergie des sources d’EA. La prévision en temps réel de la durée de vie restante est envisageable grâce à la détection de la seconde phase et à la modélisation, par une loi de type puissance, de la libération d’énergie associéeCeramic matrix composites (CMCs) are candidates for use in aeronautical applications for which durability and reliability are key factors. Beyond damage characterization, the current objective is to predict structures lifetime in service conditions. This requires quantifying damage evolution and identifying the various damage mechanisms that are involved. Therefore, it is necessary to characterize materials and define suitable damage indicators. The use or development of models would then allow the evaluation of remaining lifetime based on the analysis of precursory events. In this context, Acoustic Emission (AE) is a suitable technique. Indeed, damage mechanisms release energy in the form of transient elastic waves. Their recording, named Acoustic Emission, allows monitoring material damage growth. This technique is used in this work, which is composed of two complementary parts. The first part aims at identifying the acoustic signature of mechanisms involved in damaging of ceramic matrix composites. This would allow an accurate characterization of damage evolution and would provide indicators for rupture prediction. The second part focuses on the evaluation of remaining lifetime under static fatigue loading based on the energy of AE sources as a measure of damage. The following work shows the contribution of acoustic emission for the analysis of mechanical behaviour and lifetime prediction of CMCs. In the first part, a robust characterization of AE sources and the use of multivariate analysis allow monitoring the growth of each damage mechanism. In the second part, two reproducible phases in the behaviour of CMCs under static fatigue are identified on the AE sources energy release by two real-time indicators. The detection of the second phase and modelling of associated energy release by a power law would allow real-time prediction of the remaining lifetime
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Ingverud, Patrik. "Complexity evaluation of CNNs in tightly coupled hybrid recommender systems." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-232027.
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In this report we evaluated how the complexity of a Convolutional Neural Network (CNN), in terms of number of filters, size of filters and dropout, affects the performance on the rating prediction accuracy in a tightly coupled hybrid recommender system. We also evaluated the effect on the rating prediction accuracy for pretrained CNNs in comparison to non-pretrained CNNs. We found that a less complex model, i.e. smaller filters and less number of filters, showed trends of better performance. Less regularization, in terms of dropout, had trends of better performance for the less complex models. Regarding the comparison of the pretrained models and non-pretrained models the experimental results were almost identical for the two denser datasets while pretraining had slightly worse performance on the sparsest dataset.I denna rapport utvärderade vi komplexiteten på ett neuralt faltningsnätverk (eng. Convolutional Neural Network) i form av antal filter, storleken på filtren och regularisering, i form av avhopp (eng. dropout), för att se hur dessa hyperparametrar påverkade träffsäkerheten för rekommendationer i ett hybridrekommendationssystem. Vi utvärderade även hur förträning av det neurala faltningsnätverket påverkade träffsäkerheten för rekommendationer i jämförelse med ett icke förtränat neuralt faltningsnätverk. Resultaten visade trender på att en mindre komplex modell, det vill säga mindre och färre filter, gav bättre resultat. Även mindre regularisering, i form av avhopp, gav bättre resultat för mindre komplexa modeller. Gällande jämförelsen med förtränade modeller och icke förtränade modeller visade de experimentella resultaten nästan ingen skillnad för de två kompaktare dataseten medan förträning gav lite sämre resultat på det glesaste datasetet.
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Wilson, Sarah M. "Joint Economic Development Districts: Evaluation of a Third Wave Strategy." University of Cincinnati / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1243011569.
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