Dissertations / Theses: 'Mulit'

1

COGLEY, CHARLES ZACHARY. "Justice and Mulit-Party Politics." University of Cincinnati / OhioLINK, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=ucin998064401.

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McNamara, Darren Phillip. "Characterisation and investigation of multiple-input multiple-output wireless communication channels." Thesis, University of Bristol, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.274672.

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Miller, Sarah Victoria. "Mulit-Resolution Aitchison Geometry Image Denoising for Low-Light Photography." University of Dayton / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1596444315236623.

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4

Saïdi, Taofik. "Architectures matérielles pour la technologie WCDMA étendue aux systèmes mulit-antennes." Phd thesis, Université Rennes 1, 2008. http://tel.archives-ouvertes.fr/tel-00446060.

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Depuis une dizaine d'années, l'avènement des techniques multi-antennes (ou MIMO) pour les communications sans fil, mobiles ou fixes, a révolutionné les possibilités offertes pour de nombreux domaines d'application des télécommunications. La disposition de plusieurs antennes de part et d'autre du lien augmente considérablement la capacité des systèmes sans fil. Cependant, les al- gorithmes numériques à mettre en œuvre pour réaliser ces systèmes sont autrement complexes et constituent un challenge quant à la définition d'architectures matérielles performantes. L'objectif du travail présent repose précisément sur la définition optimale de solutions architecturales, dans un contexte CDMA, pour contrer cette problématique. Le premier aspect de ce travail porte sur une étude approfondie des algorithmes spatio- temporels et des méthodes de conception en vue d'une implantation matérielle efficace. De nom- breux schémas de détection sont proposés dans la littérature et sont applicables suivant trois critères qui sont : la qualité de service, le débit binaire et la complexité algorithmique. Cette dernière constitue une contrainte forte pour une mise en application à faible coût de terminaux mobiles intégrant ces applications. Aussi, il est nécessaire de disposer d'outils performants pour simuler, évaluer et affiner (prototypage rapide) ces nouveaux systèmes, candidats probables pour les télécommunications de quatrième génération. Le second aspect concerne la réalisation d'un transcepteur multi-antennes sans codage de ca- nal, intégrant la technologie d'accès multiple par répartition de codes dans le cas d'un canal large bande. Un système mono-antenne WCDMA, généralisable à un nombre quelconque d'antennes, a été intégré et simulé au sein de la plate-forme de prototypage rapide Lyrtech. L'architecture développée intègre les principaux modules du traitement en bande de base, à savoir le filtrage de Nyquist, la détection des multiples trajets suivie de l'étape de détection. Le prototype MIMO- WCDMA développé est caractérisé par sa flexibilité suivant le nombre de voies entrantes, le for- mat d'entrée des échantillons, les caractéristiques du canal sans fil et la technologie ciblée (ASIC, FPGA). Le troisième aspect se veut plus prospectif en détaillant de nouveaux mécanismes pour réduire le coût matériel des systèmes multi-antennes. Le principe d'allocation adaptative de la virgule fixe est présenté dans le but d'adapter le codage des données suivant les caractéristiques du canal sans fil et de minimiser en conséquence la complexité du circuit. D'autre part, le concept d'ar- chitectures adaptatives est proposé afin de minimiser l'énergie consommée au sein d'un système embarqué suivant le contexte d'application.

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Abrams, Micah Lowell. "General-Order Single-Reference and Mulit-Reference Methods in Quantum Chemistry." Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/6852.

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Many-body perturbation theory and coupled-cluster theory, combined with carefully constructed basis sets, can be used to accurately compute the properties of small molecules. We applied a series of methods and basis sets aimed at reaching the ab initio limit to determine the barrier to planarity for ethylene cation. For potential energy surfaces corresponding to bond dissociation, a single Slater determinant is no longer an appropriate reference, and the single-reference hierarchy breaks down. We computed full configuration interaction benchmark data for calibrating new and existing quantum chemical methods for the accurate description of potential energy surfaces. We used the data to calibrate single-reference configuration interaction, perturbation theory, and coupled-cluster theory and multi-reference configuration interaction and perturbation theory, using various types of molecular orbitals, for breaking single and multiple bonds on ground-state and excited-state surfaces. We developed a determinant-based method which generalizes the formulation of many-body wave functions and energy expectation values. We used the method to calibrate single-reference and multi-reference configuration interaction and coupled-cluster theories, using different types of molecular orbitals, for the symmetric dissociation of water. We extended the determinant-based method to work with general configuration lists, enabling us to study, for the first time, arbitrarily truncated coupled-cluster wave functions. We used this new capability to study the importance of configurations in configuration interaction and coupled-cluster wave functions at different regions of a potential energy surface.

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Hou, Quan. "Spatial restructuring, jobs-housing relationship and commute in urban China : a multi-temporal and mulit-level analysis of Guangzhou." HKBU Institutional Repository, 2012. https://repository.hkbu.edu.hk/etd_ra/1429.

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7

Cunico, Brea. "Meeting the needs of mulit/biracial children in school and at home." Online version, 2009. http://www.uwstout.edu/lib/thesis/2009/2009cunicob.pdf.

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Crowley, Michael J. "Subtyping boys with conduct problems categorical and dimensional approaches with mulit-modal [i.e. multi-modal] assessment of psychophysiology and behavior /." College Park, Md. : University of Maryland, 2004. http://hdl.handle.net/1903/2062.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2004.
Thesis research directed by: Psychology. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

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9

Pfeifer, Stefan [Verfasser]. "A Virtual Core Facility for Mulit-Center Applications in Medical Engineering / Stefan Pfeifer." Aachen : Shaker, 2014. http://d-nb.info/1066196419/34.

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Seaman, Claire Elizabeth Anne. "Family business networks : mulit-rational perspectives on networking in family owned and managed small and micro-businesses." Thesis, Edinburgh Napier University, 2011. http://researchrepository.napier.ac.uk/Output/5684.

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This portfolio considers the manner in which family businesses network. Networks are vital for small and micro-businesses but within current research mono-rationalist approaches, where the business is studied in relative isolation from the social component, predominate, despite an acceptance that in family businesses a family and a business co-exist. The report and papers within this portfolio argue that alternative perspectives on family business networks exist and can form appropriate frameworks for research. Specifically, an expansion of current network theory to include factors not directly relevant to the business but which by existing may influence the business is proposed, characterised here as theories of multiple rationalities. Multi-rational perspectives on family business networks offer, it is argued, greater understanding of the co-existence of family, friendship and business networks. This portfolio contains four components. A report sets family business research in context and summarises the over-arching conclusions of the portfolio. Output One comprises a literature review using secondary sources to examine current developments in family business research. Notably, discussion surrounding multiple-rationalities in the strategy literature is pertinent to the study of networks and provides the basis for the schematic model developed in Output One. Output Two considers family businesses in a peri-urban area, providing evidence to support the use of multi-rational approaches and concludes with two illustrative case studies which allow the additional network links visible using multi-rational perspectives to be viewed. Output Three presents a case study of a family with a distinct and on-going pattern of business start-up, whose approaches to networking are explored from a multi-rational perspective. In addition to the business implications, the implications for policy and business support research are considerable. If family businesses draw on networks for business support, understanding networks should form a vital part of both policy and the business support landscape.

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Martin, Brona Colette. "Portfolio of original compositions." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/portfolio-of-original-compositions(7253d29c-0bbc-45f1-acc2-65acd0041ff0).html.

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Electroacoustic music has a unique ability to connect the listener to places, space and stories both real and imaginary. Each work within the portfolio explores specific objects, spaces and places. The intrinsic sonic qualities are explored and a musical narrative takes the listener through a newly composed imaginary space. Six original compositions are presented in this portfolio. The titles of these works are as follows: Lamenting, 192, All Along the Bell Tower, Oz, The Thing About Listening is…. and A Bit Closer to Home. Narrative structures that simulate a journey are used as a guide for the listener through immersive, virtual soundworlds. These spoken word and musical narratives also serve as a structural tool for the composer. Imagined and real sonic layers within stories and soundscapes are analysed, deconstructed and manipulated. These works convey a message, story or sense of place to the listener, while revealing sonic qualities that are not normally the focus of listening. My aim as a composer is to enhance the daily listening experiences of the listener, as they become more aware and appreciative of the sounds around them, through the sounds and spaces they experience in my music.

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Giles, Sally J. "Exploring the attitudes of health care professionals towards incident reporting within three NHS trusts : a mulit-method approach." Thesis, University of Manchester, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.511212.

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ABSTRACT OF THESIS submitted by Sally J. Giles for the degree of Doctor of Philosophy and entitled, "Exploring the attitudes of health care professionals towards incident reporting within three NHS trusts: a multi-method approach". August 2005 Adverse events are thought to occur in up to 16% of hospital admissions. As a result there has been a drive towards establishing incident reporting systems as a an error prevention tool. In health care these systems are typically based on those developed in other high-risk industries. However they are often subject to high levels of underreporting and therefore fail to establish the real causes of adverse events. Health care organisations aim to take a systems approach to analysing error, therefore creating a low-blame culture. However a number of inter-professional issues and a weak safety culture amongst health care professionals can prevent this from taking place. This study aimed to determine the attitudes of health care professionals towards incident reporting. In order to achieve this a multi-method approach using both qualitative interviews and a survey was employed in an attempt to triangulate the research findings. Twenty-eight health care professionals from the department of orthopaedics in three NHS trusts were interviewed and a survey developed from the interviewees was sent to all health care professionals in orthopaedics at the three NHS trusts. The findings from the survey complemented the qualitative data and were able to validate some of the findings. In spite of a drive towards establishing a safety culture within the NHS, there was still evidence of a weak safety culture and attitudes of health care professionals towards incident reporting were very negative. The thesis drew particular attention to the existence of subcultures within the NHS and how this may limit the use of the theories and concepts used in other high-risk industries.

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13

Carter, Bruce, and Troy Scoughton. "Low-cost, short-term development or high-data-rate, multi-stream, mulit-data type telemetry acquisition/processing system using an off-the-shelf integrated Telemetry Front End." International Foundation for Telemetering, 1989. http://hdl.handle.net/10150/614541.

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International Telemetering Conference Proceedings / October 30-November 02, 1989 / Town & Country Hotel & Convention Center, San Diego, California
This paper explores the effects the new breed of off-theshelf integrated telemetry front end (TFE) packages have on the cost and schedule of the development cycle associated with real-time telemetry acquisition/processing systems. A case study of an actual project involving replacement of the Holloman AFB sled track telemetry processing system (TPS) with a system capable of simultaneously supporting up to twenty (20) asynchronous data streams is profiled. Notable among the capabilities of the system are; support for PCM, PAM, FM, IRIG and Local time streams; incoming data rates up to 10 Megabits/sec/stream; data logging rates over 16 MegaBytes/sec and the use of local area networks for distribution of data to real-time displays. To achieve these requirements within a manageable cost/schedule framework, the system was designed around an integrated TFE sub-system. Comparisons are drawn between several aspects of this projects development and that of an earlier developmental system which was completed by PSL within the last 16 months.

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Borislav, Simendić. "Niskotemperaturno procesiranje sol-gel mulita." Phd thesis, Univerzitet u Novom Sadu, Tehnološki fakultet Novi Sad, 2003. https://www.cris.uns.ac.rs/record.jsf?recordId=71471&source=NDLTD&language=en.

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Apstrakt je obrađen tehnologijama za optičko prepoznavanje teksta (OCR).Mehanizam nastanka mulita zavisi od načina doziranja polaznih oblika reaktanata kao što su alumina i silika. Dobijanje mulita sol-gel postupkom je u velikoj meri poboljšano u odnosu na klasično procesiranje zbog mogućnosti homogenog mešanja AI₂O₃ i SiO₂ komponenti i kontrole dodataka. Sol-gel metod omogućuje pripremu vrlo homogenih i reaktivnih gelova koji mogu da sinteruju na nižim temperaturama pri čemu se može postići vrlo fina mikrostruktura. U ovom radu koji se odnosio na procesiranje mulita sol-gel postupkom, hipoteza je bila da se na samom početku procesiranja aluminijumovi joni iz alkoholnog rastvora Al-soli uključuju u polimernu gel strukturu koju formira silika. Svrha ovog rada, je proučavanje uticaja procesnih promenjivih, dodatka fluornog jona i “seedinga” na temperaturu nastanka sol-gel mulita pri čemu se očekuje što je moguće niža tempertura nastanka mulita (niža od 980⁰C). Polimerni sol je dobijen u prvom slučaju mešanjem TEOS-a i aluminijum nitrata nanohidrata koji je prethodno rastvoren u etil alkoholu. U drugom slučaju, u polimerni sol je dodavan fluorni jon u koncentraciji 2 do 5 % mas. u odnosu na očekivani prinos mulita i u trećem slučaju je dodavana različita količina mulitnih klica (2-4 % mas.). Eksperimantalno je potvrđeno da procesne promenljive; pH, temperatura geliranja i R odnos imaju, veliki uticaj na brzinu geliranja i na nastanak mulita. U slučaju dodavanja fluornog jona, potvrdena je hipoteza da fluorni jona na različite načine utiče na mehanizam nastanka mulita, pri čemu u prvom slučaju prisustvo fluornog jona obezbeduje mesta u oblastima razdvajanja granica faza nakon geliranja koja utiču na proces nukleacije. Ova mesta slično procesu kristalizacije stakla, omogućuju lakšu nukleaciju mulita prilikom njegove transformacije iz gela. Mesta na granici razdvanja faza postaju mesta na kojima se uspostavlja proces heterogene nukleacije što je jedan od mogućih načina za snižavanje temperature nastanka mulita. Pored ovoga, dodavanje fluornog jona je doprinelo promeni mulitnih gel struktura, pri čemu je promena brzine hidrolize silike imala za posledicu promenu sadržaja vezane vode u toku geliranja što se takođe značajno odražavalo na temperaturu nastanka mulita. Eksperimentalni rezultati termički obradenih gelova su pokazali, da dodavanje lluornog jona u polimerni mulitni sol stvara uslove za snižavanje temperature obrazovanja mulita sve do 890⁰C. U ovom radu je takođe pokazano da mulitne čestice, kao nukleanti pri “seeding" procesiranju, doprinose nastanku mulitnog gela koji nakon termičke obrade na 1000⁰C pokazuje veoma finu mikrostrukturu.
Abstract was processed by technology for Optical character recognition (OCR).The mechanism of mullite formation depends upon the method of combining the alumina and silica containing reactants. Mullite can be obtained through the sol-gel process and can be greatly improved by the control of some reaction conditions particulaiiy by homogeneous mixing of Al2O3 and SiO2, and controlling of the additions. Sol-gel method allow preparation of very homogenous and reactive gels which can be sintering at low temperature and consequently submicronic microstructure can be reached. In this study of the mullite formation by sol-gel method, the hypothesis was that aluminium ions from alcoholic solulion of its salts incorporate to polymeric silica gel structure. The aim of this work was the investigation of the effect processing variables, fluorine addition and “seeding”on the temperature of sol-gel mullite formation and to obtain as lower temperature of mullite formation as possible (smaller than 980°C). Polymeric sols, were prepared by the mixing of TEOS and aluminum nitrate nanohydrate dissolved in absolute ethyl alcohol and by adding fluorine ions in the second case from 2 wt.% to 5 wt.% and by different content of mullite seeded (2- 4 wt. %). Experimentally is determined that the processing variables as pH, gelling temperature and R ratio have high influence on the gelling rate and mullite formation. The hypothesis in the case of fluorine addition was that addition of fluorine ions could have different effects on the mechanism of mullite formation; the first it makes the sites at boundary of phase separation regions after gelling which influence at the process of the nucleation. These sites will act as a place for easy mullite nucleation, similar to process of the glass crystallization. The boundaries of the phase separation are the sites for heterogeneous nucleation which is one of the condition for lowering the temperature of mullite formation. Besides, fluorine addition could change the mullite gel structure (by changing the rate of hydrolyses of silica and it could change the content of bonded water during gelling), which should be very important for the temperature of mullite formation, too. The experimental results of heat treated gels showed that the addition of fluorine ion does decrease the temperature of mullite formation (in respect to classical sol-gel mullite processing) up to 8900C. As a nucleant in this study the mullite powder by “seeding” process contribute to muillite gel formation that after heat treatment up to 10000C showed very fine microstructure.

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15

Moon, Chiung. "Evolutionary system approach for advanced planning in mulit-plant chain = Shinka shisutemu-teki gihō ni yoru maruchi puranto chēn no senshinteki keikaku /." Electronic version of text Electronic version of summary Electronic version of examination, 2004. http://www.wul.waseda.ac.jp/gakui/honbun/3834/.

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16

Küng, Lucy. "When innovation fails to disrupt : a mulit-lens investigation of successful incumbent response to technological discontinuity : the launch of BBC news online /." Jönköping : Jönköping University - Media Management and Transformation Centre, 2007. http://aleph.unisg.ch/hsgscan/hm00193927.pdf.

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17

Küng, Lucy. "When innovation fails to disrupt : a mulit-lens investigation of successful incumbent response to technological discontinuity : the launch of BBC news online /." St. Gallen, 2005. http://aleph.unisg.ch/hsgscan/hm00132055.pdf.

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18

Liao, Yixiang. "Development and validation of models for bubble coalescence and breakup." Forschungszentrum Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-134760.

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A generalized model for bubble coalescence and breakup has been developed, which is based on a comprehensive survey of existing theories and models. One important feature of the model is that all important mechanisms leading to bubble coalescence and breakup in a turbulent gas-liquid flow are considered. The new model is tested extensively in a 1D Test Solver and a 3D CFD code ANSYS CFX for the case of vertical gas-liquid pipe flow under adiabatic conditions, respectively. Two kinds of extensions of the standard multi-fluid model, i.e. the discrete population model and the inhomogeneous MUSIG (multiple-size group) model, are available in the two solvers, respectively. These extensions with suitable closure models such as those for coalescence and breakup are able to predict the evolution of bubble size distribution in dispersed flows and to overcome the mono-dispersed flow limitation of the standard multi-fluid model. For the validation of the model the high quality database of the TOPFLOW L12 experiments for air-water flow in a vertical pipe was employed. A wide range of test points, which cover the bubbly flow, turbulent-churn flow as well as the transition regime, is involved in the simulations. The comparison between the simulated results such as bubble size distribution, gas velocity and volume fraction and the measured ones indicates a generally good agreement for all selected test points. As the superficial gas velocity increases, bubble size distribution evolves via coalescence dominant regimes first, then breakup-dominant regimes and finally turns into a bimodal distribution. The tendency of the evolution is well reproduced by the model. However, the tendency is almost always overestimated, i.e. too much coalescence in the coalescence dominant case while too much breakup in breakup dominant ones. The reason of this problem is discussed by studying the contribution of each coalescence and breakup mechanism at different test points. The redistribution of the gaseous phase from the injection position at the pipe wall to the whole cross section is overpredicted by the Test Solver especially for the test points with high superficial gas velocity. Besides the models for bubble forces, the simplification of the Test Solver to a 1D model has an influence on the redistribution process. Simulations performed using CFX show that a considerable improvement is achieved with comparison to the results delivered by the standard closure models. For the breakup-dominant cases, the breakup rate is again overestimated and the contribution of wake entrainment of large bubbles is underestimated. Furthermore, inlet conditions for the liquid phase, bubble forces as well as turbulence modeling are shown to have a noticeable influence, especially on the redistribution of the gaseous phase.

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Wang, Yawen. "Torque Load Effect on Multi-Point Mesh and Dynamics of Right-angle Geared Drives." University of Cincinnati / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1384870250.

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20

Conger, Michael Anthony. "Validation of CFD-MBD FSI for high-gidelity simulations of full-scale WAM-V sea-trials with suspended payload." Thesis, University of Iowa, 2015. https://ir.uiowa.edu/etd/1960.

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High-fidelity CFD-MBD FSI (Computational Fluid Dynamics - Multi Body Dynamics Fluid-Structure Interaction) code development and validation by full-scale experiments is presented, for a novel hull form, WAM-V (Wave Adaptive Modular Vessel). FSI validation experiments include cylinder drop with suspended mass and 33 ft WAM-V sea-trials. Calm water and single-wave sea-trails were with the original suspension, while the rough-water testing was with a second generation suspension. CFDShip-Iowa is used as CFD solver, and is coupled to Matlab Simulink MBD models for cylinder drop and second generation WAM-V suspension. For 1DOF cylinder drop, CFD verification and validation (V&V) studies are carried out including grid and time-step convergence. CFD-MBD results for 2DOF cylinder drop show that 2-way coupling is required to capture coupled physics. Overall, 2-way results are validated with an overall average error value of E=5.6%DR for 2DOF cylinder drop. For WAM-V in calm water, CFD-MBD 2-way results for relative pod angle are validated with E=14.2%DR. For single-wave, CFD-MBD results show that 2-way coupling significantly improves the prediction of the peak amplitude in pontoon motions, while the trough amplitudes in suspension motions are under-predicted. The current CFD-MBD 2-way results for single-wave are validated with E=17%DR. For rough-water, simulations are carried out in regular head waves representative of the irregular seas. CFD-MBD 2-way results are validation with E=23%D for statistical values and the Fourier analysis results, which is reasonable given the differences between simulation waves and experiments.

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Meißner, Frank. "Produktion unter Risiko : ein agentenbasiertes, sektorales Partialmodell zur Anwendung in der Nachhaltigkeitsforschung." Phd thesis, Universität Potsdam, 2007. http://opus.kobv.de/ubp/volltexte/2008/1881/.

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Mit der hier vorliegenden Arbeit wird ein mikroökonomisches Multiagentenmodell eines Produktionssektors vorgeschlagen. Das Modell folgt einem post-walrasianischem Ungleichgewichtsansatz und beschreibt optimierende Agenten der Produktionsseite. Diese berücksichtigen in probabilistischen Nebenbedingungen Risiken des Cash Flow, die sich aus unsicheren Absatzmengen ergeben. Produzenten stehen in monopolistischer Konkurrenz und lernen durch Beobachten. Wird vorliegendes Modell in ein Totalmodell integriert, so wird es möglich, die sich aus der Klimadebatte ergebenden, notwendigen Veränderungen im Investitions- und Produktionsverhalten zu diskutieren und darzustellen.
In the following thesis I propose a microeconomic Multi-Agent-Model of a production sector. I apply a Post-Walrasian disequilibrium approach and describe optimizing agents. These agents use chance constraints which depict a Cash Flow at Risk approach. Agents act in a Monopolistic-Competition environment.

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22

Liao, Yixiang. "Development and validation of models for bubble coalescence and breakup." Helmholtz-Zentrum Dresden-Rossendorf, 2013. https://hzdr.qucosa.de/id/qucosa%3A22180.

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A generalized model for bubble coalescence and breakup has been developed, which is based on a comprehensive survey of existing theories and models. One important feature of the model is that all important mechanisms leading to bubble coalescence and breakup in a turbulent gas-liquid flow are considered. The new model is tested extensively in a 1D Test Solver and a 3D CFD code ANSYS CFX for the case of vertical gas-liquid pipe flow under adiabatic conditions, respectively. Two kinds of extensions of the standard multi-fluid model, i.e. the discrete population model and the inhomogeneous MUSIG (multiple-size group) model, are available in the two solvers, respectively. These extensions with suitable closure models such as those for coalescence and breakup are able to predict the evolution of bubble size distribution in dispersed flows and to overcome the mono-dispersed flow limitation of the standard multi-fluid model. For the validation of the model the high quality database of the TOPFLOW L12 experiments for air-water flow in a vertical pipe was employed. A wide range of test points, which cover the bubbly flow, turbulent-churn flow as well as the transition regime, is involved in the simulations. The comparison between the simulated results such as bubble size distribution, gas velocity and volume fraction and the measured ones indicates a generally good agreement for all selected test points. As the superficial gas velocity increases, bubble size distribution evolves via coalescence dominant regimes first, then breakup-dominant regimes and finally turns into a bimodal distribution. The tendency of the evolution is well reproduced by the model. However, the tendency is almost always overestimated, i.e. too much coalescence in the coalescence dominant case while too much breakup in breakup dominant ones. The reason of this problem is discussed by studying the contribution of each coalescence and breakup mechanism at different test points. The redistribution of the gaseous phase from the injection position at the pipe wall to the whole cross section is overpredicted by the Test Solver especially for the test points with high superficial gas velocity. Besides the models for bubble forces, the simplification of the Test Solver to a 1D model has an influence on the redistribution process. Simulations performed using CFX show that a considerable improvement is achieved with comparison to the results delivered by the standard closure models. For the breakup-dominant cases, the breakup rate is again overestimated and the contribution of wake entrainment of large bubbles is underestimated. Furthermore, inlet conditions for the liquid phase, bubble forces as well as turbulence modeling are shown to have a noticeable influence, especially on the redistribution of the gaseous phase.

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23

Galloway, Brooke Patricia. "Perceptions of Peacebuilding and Multi-Track Collaboration in Divided Societies for a Sustainable Peace Agreement at the Political Level: A Case Study of Cyprus." PDXScholar, 2011. https://pdxscholar.library.pdx.edu/open_access_etds/308.

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It is the purpose of this study to propose that perceptions of peacebuilding activities in all tracks of divided societies (political, civil society leaders, and grassroots), and the perceptions of the collaboration between the tracks are essential processes to a sustainable peace agreement at the political level. This study will examine multi-track peacebuilding and the collaboration (or lack of it) between tracks in Cyprus. Additionally, it will analyze the perceptions of the necessity of collaboration across tracks. The analysis of this study is conducted in two phases: (1) analyzing interviews with Track One diplomats and examining previous and existing peacebuilding processes within Cyprus through observation, interviews, and analysis of existing studies; and (2) through student observations and interviews of the Cypriot populace on the perceptions of the conflict and peacebuilding collaborations among and across tracks. The results of this research indicate that there is a need for stronger connections between the political and societal level peacebuilding strategies in Cyprus for a sustainable peace agreement. Furthermore, the findings of this research suggest that multi-track collaboration should be added to Conflict Transformation Theory.

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24

Munir, Farasat. "A fast, scalable acoustic resonator-based biosensor array system for simultaneous detection of multiple biomarkers." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/47712.

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This thesis is about the design of a biosensor system for detection of multiple cancer biomarkers. Accurate diagnosis and prognosis of cancer requires early detection. Equally important, though, is the measurement of biomarker-velocity and detection of multiple biomarkers. Early detection requires highly sensitive biosensors capable of detection at very low concentrations of target molecules. Biomarker-velocity can be measured by monitoring concentration of target molecule over a period of time. This requires a system which is very easy to use, fast, flexible, inexpensive and portable, thus enabling its ubiquitous presence at the point of care. For detection of multiplexed biomarkers, biosensors which easily lend to array configuration are required. Conventional techniques do not fulfill either all or some aspects of the requirements listed above. In this work, we present the design of a biosensor system, keeping in view the desired features described above, to achieve the ultimate goal of enabling ubiquitous presence of biosensor at the point of care. We focus on acoustic transducer based biosensors. The two fundamental components of design in an acoustic biosensor are the design of an acoustic transducer and the design of a novel electrical interface for the transducer. For transducer design, we introduce and present the design of a single structure, GHz range, multi-mode acoustic resonator. We present this as a suitable transducer for liquid phase biosensors, which is the preferred medium for sensing of cancer biomarkers. We explore the underlying physics and do experimental and theoretical characterization of this device. The transducer needs to be functionalized with a chemically sensitive layer which performs the molecular recognition of cancer biomarkers. We present the experimental exploration of a reversible and oriented immobilization based Histidine-Ni(2+) interaction which used NTA as the chelator for anchoring onto the device. Then we discuss the microfluidic design to enable liquid phase operation. We used SU-8 polymer barriers for liquid containment and addressed the challenges of making it compatible with ZnO based devices. An electrical interface is needed to excite and extract the sensor response. We have presented here a novel method to measure and track a resonator's response and extract its characteristic parameters. This method measures the wideband frequency response of the resonator with a much simpler setup as compared to conventional methods. We have proposed and demonstrated the use of a white noise signal as a viable signal for broadband excitation of resonator-based sensing platforms. We have also established, shown through simulation and prototype measurements, the feasibility of the proposed method. The accuracy and speed of the system can be further greatly improved by FFT-based digital implementation of the spectral analysis system. We have presented an example hardware implementation of FFT-based signal analyzer, and have discussed the hardware resources required for actual implementation in a chip form. Lastly we discuss the measurement protocol and sensor results for head and neck cancer and prostate cancer biomarkers. These results demonstrate the usability of the proposed sensor system for detection of cancer biomarkers.

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Greco, Edwin F. "Thermal and hydrodynamic interactions between a liquid droplet and a fluid interface." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/22548.

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Thesis (Ph. D.)--Physics, Georgia Institute of Technology, 2008.
Committee Chair: Roman O. Grigoriev; Committee Member: Daniel Goldman; Committee Member: Michael Schatz; Committee Member: Minami Yoda; Committee Member: Predrag Cvitanovic.

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Koslowske, Mark T. "A process based cost model for multi-layer ceramic manufacturing of solid oxide fuel cells." Link to electronic thesis, 2003. http://www.wpi.edu/Pubs/ETD/Available/etd-0810103-173353.

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Thesis (M.S.)--Worcester Polytechnic Institute.
Keywords: process based cost model; cost model; fuel cell; PBCM; multi-layer ceramics; sofc; solid oxide fuel cell. Includes bibliographical references.

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Svennberg, Renny, and Mikael Torstensson. "Kan korslaminerat trä effektivisera ett byggsystem : En jämförelse av flervåningshus i trä." Thesis, Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-34888.

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The construction of wooden multi-storey buildings creates issues with the acoustic environment. To meet Boverkets soundproofing requirements the solutions of today results in thick partition building components taking up potential floor space. Crosslaminatedtimber is a solid timber slab that can be manufactured in varying sizes and thicknesses. These boards can then be used as supporting elements in walls, ceilings and floors. This study investigates whether cross-laminated timber can be used to streamline the construction of multi-storey wooden buildings. In this comparative survey a reference building constructed by A-hus was used and current loads, sound insulation, use of floorspace and economy were analyzed. Four different alternative walls and one floor constructed with cross-laminated timber have been studied according to the above named criteria, and then compared with the reference building. The result indicates that a wall with 80 mm cross-laminated timber board has the load capacity required, improves sound insulation and saving 16 m2 of floorspace in the reference building valued to approximately 695,000 SEK in increased sales revenue. Using cross-laminated timber in the floor does not sufficient improve A-hus current construction system and should therefore not be interesting.

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Börthas, Lovisa, and Sjölander Jessica Krange. "Machine Learning Based Prediction and Classification for Uplift Modeling." Thesis, KTH, Matematisk statistik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-266379.

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The desire to model the true gain from targeting an individual in marketing purposes has lead to the common use of uplift modeling. Uplift modeling requires the existence of a treatment group as well as a control group and the objective hence becomes estimating the difference between the success probabilities in the two groups. Efficient methods for estimating the probabilities in uplift models are statistical machine learning methods. In this project the different uplift modeling approaches Subtraction of Two Models, Modeling Uplift Directly and the Class Variable Transformation are investigated. The statistical machine learning methods applied are Random Forests and Neural Networks along with the standard method Logistic Regression. The data is collected from a well established retail company and the purpose of the project is thus to investigate which uplift modeling approach and statistical machine learning method that yields in the best performance given the data used in this project. The variable selection step was shown to be a crucial component in the modeling processes as so was the amount of control data in each data set. For the uplift to be successful, the method of choice should be either the Modeling Uplift Directly using Random Forests, or the Class Variable Transformation using Logistic Regression. Neural network - based approaches are sensitive to uneven class distributions and is hence not able to obtain stable models given the data used in this project. Furthermore, the Subtraction of Two Models did not perform well due to the fact that each model tended to focus too much on modeling the class in both data sets separately instead of modeling the difference between the class probabilities. The conclusion is hence to use an approach that models the uplift directly, and also to use a great amount of control data in each data set.
Behovet av att kunna modellera den verkliga vinsten av riktad marknadsföring har lett till den idag vanligt förekommande metoden inkrementell responsanalys. För att kunna utföra denna typ av metod krävs förekomsten av en existerande testgrupp samt kontrollgrupp och målet är således att beräkna differensen mellan de positiva utfallen i de två grupperna. Sannolikheten för de positiva utfallen för de två grupperna kan effektivt estimeras med statistiska maskininlärningsmetoder. De inkrementella responsanalysmetoderna som undersöks i detta projekt är subtraktion av två modeller, att modellera den inkrementella responsen direkt samt en klassvariabeltransformation. De statistiska maskininlärningsmetoderna som tillämpas är random forests och neurala nätverk samt standardmetoden logistisk regression. Datan är samlad från ett väletablerat detaljhandelsföretag och målet är därmed att undersöka vilken inkrementell responsanalysmetod och maskininlärningsmetod som presterar bäst givet datan i detta projekt. De mest avgörande aspekterna för att få ett bra resultat visade sig vara variabelselektionen och mängden kontrolldata i varje dataset. För att få ett lyckat resultat bör valet av maskininlärningsmetod vara random forests vilken används för att modellera den inkrementella responsen direkt, eller logistisk regression tillsammans med en klassvariabeltransformation. Neurala nätverksmetoder är känsliga för ojämna klassfördelningar och klarar därmed inte av att erhålla stabila modeller med den givna datan. Vidare presterade subtraktion av två modeller dåligt på grund av att var modell tenderade att fokusera för mycket på att modellera klassen i båda dataseten separat, istället för att modellera differensen mellan dem. Slutsatsen är således att en metod som modellerar den inkrementella responsen direkt samt en relativt stor kontrollgrupp är att föredra för att få ett stabilt resultat.

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Rossomme, Séverine. "Modélisation de l'évaporation des films liquides minces, y compris au voisinage des lignes de contact: application aux caloducs à rainures." Doctoral thesis, Universite Libre de Bruxelles, 2008. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210409.

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Les recherches que nous présentons dans ce manuscrit s’inscrivent dans le cadre de l’analyse des phénomènes de transport fondamentaux impliqués lors du processus d’évaporation d’un film liquide mince. Outre les mécanismes macroscopiques (résistance thermique du solide, capillarité, thermocapillarité, …) qui influencent le comportement de tels films, des développements fondamentaux et expérimentaux ont mis en évidence le rôle significatif d’effets microscopiques, comme les forces de van der Waals [11,96,117]. L’objectif de cette thèse est double. Il s’agit tout d’abord de caractériser les phénomènes locaux qui influencent le processus d’évaporation et ensuite, d’étendre notre étude à une échelle globale “macroscopique”. Ce manuscrit est divisé en deux parties qui correspondent à ces deux objectifs.

L’étude décrite dans la première partie propose une contribution originale à la modélisation de l’évaporation des films minces, y compris au voisinage des lignes de contact. De manière générale, nous cherchons à mettre en évidence l’influence de phénomènes qui se déroulent aux petites échelles sur le transfert thermique d’un film mince déposé sur une paroi plane et chauffée. Dans le cadre de l’hypothèse de lubrification, deux modèles sont dès lors développés. Le premier modèle décrit l’évaporation d’un film liquide mince dans sa vapeur pure tandis que le second modèle porte sur l’évaporation d’un film liquide mince dans un gaz inerte. Les diverses recherches menées sont principalement orientées vers la quantification, d’une part, des angles de contact apparents générés par l’évaporation, malgré le caractère parfaitement mouillant du couple liquide-solide utilisé et, d’autre part, des flux de chaleur et de matière interfaciaux. Une particularité du premier modèle est qu’il généralise divers modèles existants [15,25,86,117] en regroupant un ensemble de phénomènes spécifiques et complexes tels que le saut de température à l’interface liquide-vapeur, la résistance thermique de la vapeur et celle du solide ou la variation locale de la température de saturation à l’interface liquide-vapeur suite à la courbure interfaciale et aux forces de van der Waals. En plus de ces effets, d’autres mécanismes plus classiques sont inclus dans le modèle :la tension superficielle, la thermocapillarité, la pression de disjonction, l’évaporation et le recul de vapeur. Des analyses de stabilité linéaires et des études paramétriques ont été réalisées afin de quantifier l’influence de ces phénomènes sur la stabilité d’un film liquide mince, sur son évaporation et sur le transfert de chaleur associé. Au travers des chapitres 3 et 4, nous mettons notamment en évidence

• comment les forces de van der Waals compensent l’évaporation du film liquide mince de façon à créer un film stationnaire stable,

• pourquoi le recul de la vapeur et la thermocapillarité sont deux phénomènes qui peuvent être négligés dans les conditions étudiées dans ce travail,

• des lois analytiques qui décrivent certaines variables du problème, plus particulièrement l’angle de contact et le maximum du flux de chaleur, en fonction de la surchauffe de la paroi solide.

Faisant suite aux travaux proposés par Haut et Colinet [59], nous avons ensuite développé un second modèle afin de caractériser l’évaporation dans une faible quantité de gaz inerte d’un film liquide mince déposé sur une paroi plate et chauffée. Tout comme dans le cadre de l’étude précédente, notre analyse s’articule autour d’une étude de stabilité linéaire ainsi que d’études paramétriques réalisées sur des nombres caractéristiques du problème. Alors que les conclusions sur la stabilité du film sont indépendantes de la quantité de gaz inerte contenue dans la phase vapeur, il n’en est pas de même pour les transferts de matière et de chaleur interfaciaux comme montré au chapitre 5.

Dans la seconde partie du travail, nous utilisons les conclusions auxquelles nous sommes arrivés dans la première partie dans le cadre d’une application industrielle. En collaboration avec le Centre d’Excellence en Recherche Aéronautique (CENAERO) et la société Euro Heat Pipes (EHP), une stratégie a été élaborée afin de simuler les transferts thermiques radiaux dans une rainure d’un caloduc au niveau de l’évaporateur. Les résultats numériques, obtenus sur base d’un modèle multi-échelle développé à l’ULB et implémenté numériquement lors d’un stage chez CENAERO, montrent que ces transferts sont influencés par la valeur de l’angle de contact. Celui-ci dépendant des phénomènes microscopiques, il s’avère par conséquent nécessaire de les inclure dans le modèle thermique. En effet, si nous ne considérons que les aspects macroscopiques du problème, qui se résument à la conduction dans le solide et dans le liquide, le coefficient d’échange global au niveau de la rainure est surestimé.

Doctorat en Sciences de l'ingénieur
info:eu-repo/semantics/nonPublished

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Cufoglu, Ayse. "Multi-dimensional clustering in user profiling." Thesis, University of Westminster, 2012. https://westminsterresearch.westminster.ac.uk/item/8z6wq/multi-dimensional-clustering-in-user-profiling.

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User profiling has attracted an enormous number of technological methods and applications. With the increasing amount of products and services, user profiling has created opportunities to catch the attention of the user as well as achieving high user satisfaction. To provide the user what she/he wants, when and how, depends largely on understanding them. The user profile is the representation of the user and holds the information about the user. These profiles are the outcome of the user profiling. Personalization is the adaptation of the services to meet the user’s needs and expectations. Therefore, the knowledge about the user leads to a personalized user experience. In user profiling applications the major challenge is to build and handle user profiles. In the literature there are two main user profiling methods, collaborative and the content-based. Apart from these traditional profiling methods, a number of classification and clustering algorithms have been used to classify user related information to create user profiles. However, the profiling, achieved through these works, is lacking in terms of accuracy. This is because, all information within the profile has the same influence during the profiling even though some are irrelevant user information. In this thesis, a primary aim is to provide an insight into the concept of user profiling. For this purpose a comprehensive background study of the literature was conducted and summarized in this thesis. Furthermore, existing user profiling methods as well as the classification and clustering algorithms were investigated. Being one of the objectives of this study, the use of these algorithms for user profiling was examined. A number of classification and clustering algorithms, such as Bayesian Networks (BN) and Decision Trees (DTs) have been simulated using user profiles and their classification accuracy performances were evaluated. Additionally, a novel clustering algorithm for the user profiling, namely Multi-Dimensional Clustering (MDC), has been proposed. The MDC is a modified version of the Instance Based Learner (IBL) algorithm. In IBL every feature has an equal effect on the classification regardless of their relevance. MDC differs from the IBL by assigning weights to feature values to distinguish the effect of the features on clustering. Existing feature weighing methods, for instance Cross Category Feature (CCF), has also been investigated. In this thesis, three feature value weighting methods have been proposed for the MDC. These methods are; MDC weight method by Cross Clustering (MDC-CC), MDC weight method by Balanced Clustering (MDC-BC) and MDC weight method by changing the Lower-limit to Zero (MDC-LZ). All of these weighted MDC algorithms have been tested and evaluated. Additional simulations were carried out with existing weighted and non-weighted IBL algorithms (i.e. K-Star and Locally Weighted Learning (LWL)) in order to demonstrate the performance of the proposed methods. Furthermore, a real life scenario is implemented to show how the MDC can be used for the user profiling to improve personalized service provisioning in mobile environments. The experiments presented in this thesis were conducted by using user profile datasets that reflect the user’s personal information, preferences and interests. The simulations with existing classification and clustering algorithms (e.g. Bayesian Networks (BN), Naïve Bayesian (NB), Lazy learning of Bayesian Rules (LBR), Iterative Dichotomister 3 (Id3)) were performed on the WEKA (version 3.5.7) machine learning platform. WEKA serves as a workbench to work with a collection of popular learning schemes implemented in JAVA. In addition, the MDC-CC, MDC-BC and MDC-LZ have been implemented on NetBeans IDE 6.1 Beta as a JAVA application and MATLAB. Finally, the real life scenario is implemented as a Java Mobile Application (Java ME) on NetBeans IDE 7.1. All simulation results were evaluated based on the error rate and accuracy.

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Bianchin, John. "Can a Civil Society Organization Quietly Affect Political Identity in a War-Torn Nation? The Story of Escuela Nueva in Colombia." Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/76814.

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The Escuela Nueva is a unique non-governmental organization which has collaborated with the Colombian Ministry of Education, the Federation of Colombian Coffee Growers, and corporate partners to improve access to and quality of education. The Escuela Nueva Foundation enacts policies based on the political belief that all children should have the basic right to an education. The most visible way that the Escuela Nueva promotes this belief is through the implementation of multi-grade classrooms, where more advanced students aid those who are younger or further behind in their studies. The Escuela Nueva classroom model was implemented in 1977 as a response to the shortcomings in teacher training and replicability that were the downfall of earlier attempts to implement multi-grade models in rural Colombia. The gradual growth and continual improvements to their model has afforded the Escuela Nueva Foundation a level of immunity from state intervention that few other non-state actors enjoy. Although the Colombian state government has historically been opposed to those non-state actors with overtly political goals, the cost-effective and competitive services provided by the Escuela Nueva programs, like their multi-grade schools and Learning Circles, acted as a strong incentive for allowing this organization's work to continue. Organizations like the Escuela Nueva, particularly those that partner with public and private actors to achieve service-oriented goals, play an important role in Colombia, creating new social forums where individuals can share their political identities and beliefs in a way that affects real change in the communities where they live.
Master of Arts

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Faradi, Tarik. "Conception d’un système antennaire multi-standard multi-applications dédié au module TRAXBOX pour le suivi de conteneurs." Thesis, Nice, 2016. http://www.theses.fr/2016NICE4023.

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Ce mémoire présente la conception de différents systèmes antennaires miniatures devant fonctionner dans des conditions environnementales et climatiques sévères, mais également capables d’opérer dans plusieurs bandes de fréquence ISM et plusieurs standards de communications mobiles. Ce système antennaire dédié infine à l’intégration dans les modules TRAX-BOX développés par la société TRAXENS, doit satisfaire différents critères techniques, industriels et économiques, définis par leur application finale qui est le suivi de conteneurs métalliques multimodaux de grandes dimensions. Pour cela, le système doit présenter un fonctionnement multibande et large bande, un diagramme de rayonnement omnidirectionnel, une bonne efficacité, un encombrement réduit permettant une intégration simple et efficace dans son boîtier, une rigidité mécanique permettant au système d’être protégé contre les vibrations et les chocs, une large plage de températures de fonctionnement et un faible coût de fabrication. Ces exigences techniques et industrielles sont souvent difficiles à satisfaire simultanément. Pour ce faire, plusieurs techniques de conception de systèmes multi-antennaires multibandes ont été employées. L’insertion de fentes sur les résonateurs et la juxtaposition d’éléments parasites a tout d’abord permis d’élargir la bande des antennes. En ce qui concerne l’isolation mutuelle des antennes, l’insertion de fentes sur le plan de masse, est l’une des techniques qui permettent d’isoler les antennes
This thesis presents the design of different small antenna systems, operating in harsh environmental and climatic conditions, but also be able to operate in several ISM frequency bands and several mobile communication standards. This antenna system designed to be integrated in the TRAXBOX modules developed by TRAXENS, must meet various technical, industrial and economic criteria, defined by their final application which is the monitoring of multimodal metallic containers. To this end, the system must provide a multiband and wideband operations, an omnidirectional radiation pattern, a good efficiency, a reduced size allowing an easy and efficient integration into its housing, mechanical rigidity allowing the system to be protected against vibrations and shocks, a wide operating temperature range and low manufacturing cost. These technical and manufacturing requirements are often difficult to simultaneously satisfy. To do this, several design techniques of multiband multi-antenna systems have been employed. The use of slots and parasitic elements has first allowed widening the antennas bands. Regarding the mutual isolation of the antennas, the insertion of slots on the ground plane is one of the techniques that improve the antennas isolation. However, in this manuscript, we have mainly focused on the optimal layout of the parasitic resonators to simultaneously increase the bandwidth but also optimize the system efficiency and the isolation between antennas after interpretation of the various physical phenomena observed

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Rorato, Lucien Triolaire Ch. "Serveur de dialogue multi-activites, multi-fenetres et multi-consoles." S.l. : Université Grenoble 1, 2008. http://dumas.ccsd.cnrs.fr/dumas-00311467.

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Jernigan, Nicholas R. (Nicholas Richard). "Multi-modal, multi-period, multi-commodity transportation : models and algorithms." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/91399.

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Thesis: S.M., Massachusetts Institute of Technology, Sloan School of Management, Operations Research Center, 2014.
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"June 2014." Cataloged from PDF version of thesis.
Includes bibliographical references (pages 51-54).
In this paper we present a mixed integer optimization framework for modeling the shipment of goods between origin destination (O-D) pairs by vehicles of different types over a time-space network. The output of the model is an optimal schedule and routing of vehicle movements and assignment of goods to vehicles. Specifically, this framework allows for: multiple vehicles of differing characteristics (including speed, cost of travel, and capacity), transshipment locations where goods can be transferred between vehicles; and availability times for goods at their origins and delivery time windows for goods at their destinations. The model is composed of three stages: In the first, vehicle quantities, by type, and goods are allocated to routes in order to minimize late deliveries and vehicle movement costs. In the second stage, individual vehicles, specified by vehicle identification numbers, are assigned routes, and goods are assigned to those vehicles based on the results of the first stage and a minimization of costs involved with the transfer of goods between vehicles. In the third stage we reallocate the idle time of vehicles in order to satisfy crew rest constraints. Computational results show that provably optimal or near optimal solutions are possible for realistic instance sizes.
by Nicholas R. Jernigan.
S.M.

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O'Hagan, Seamus. "Multi-mode absorption spectroscopy for multi-species and multi-parameter sensing." Thesis, University of Oxford, 2017. https://ora.ox.ac.uk/objects/uuid:6f422683-7c50-47dd-8824-56b4b4ea941d.

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The extension of Multi-mode Absorption Spectroscopy (MUMAS) to the infra-red spectral region for multi-species gas sensing is reported. A computationally efficient, theoretical model for analysis of MUMAS spectra is presented that avoids approximations used in previous work and treats arbitrary and time-dependent spectral intensity envelopes, thus facilitating the use of commercially available Interband Cascade Lasers (ICLs) and Quantum Cascade Lasers (QCLs). The first use of an ICL for MUMAS is reported using a multi-mode device operating at 3.7 μm to detect CH₄ transitions over a range of 30 nm. Mode-linewidths are measured using the pressure-dependent widths of an isolated absorption feature in HCl. Multi- species sensing is demonstrated by measurement of partial pressures of CH₄, C₂H₂ and H₂CO in a low-pressure mixture with uncertainties of around 10%. Detection of CH₄ in N₂ at 1 bar is demonstrated using a shorter-cavity ICL to resolve spectral features in pressure-broadened and congested spectra. The first use of a QCL for MUMAS is reported using a commercially available device operating at 5.3 μm to detect multiple absorption transitions of NO at a partial pressure of 2.79 μbar in N₂ buffer gas. The revised model is shown to enable good fits to MUMAS data by accounting for the time-variation of the spectral intensity profile during frequency scanning. Individual mode-linewidths are derived from fits to pressure- dependent MUMAS spectra and features from background interferences due to H₂O in laboratory air are distinguished from those of the target species, NO. Data obtained at scan rates up to 10 kHz demonstrate the potential for achieving short measurement times. The development of a balanced ratiometric detection scheme for MUMAS with commercially available multi-mode lasers operating at 1.5 μm is reported for simultaneous detection of CO and CO₂ showing improved SNR performance over previous direct transmission methods and suitability for a compact field-employable instrument. In addition, MUMAS spectra of CO₂ are used to derive gas temperatures with an uncertainty of 3.2% in the range 300 - 700 K.

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Kesorn, Kraisak. "Multi modal multi-semantic image retrieval." Thesis, Queen Mary, University of London, 2010. http://qmro.qmul.ac.uk/xmlui/handle/123456789/438.

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The rapid growth in the volume of visual information, e.g. image, and video can overwhelm users’ ability to find and access the specific visual information of interest to them. In recent years, ontology knowledge-based (KB) image information retrieval techniques have been adopted into in order to attempt to extract knowledge from these images, enhancing the retrieval performance. A KB framework is presented to promote semi-automatic annotation and semantic image retrieval using multimodal cues (visual features and text captions). In addition, a hierarchical structure for the KB allows metadata to be shared that supports multi-semantics (polysemy) for concepts. The framework builds up an effective knowledge base pertaining to a domain specific image collection, e.g. sports, and is able to disambiguate and assign high level semantics to ‘unannotated’ images. Local feature analysis of visual content, namely using Scale Invariant Feature Transform (SIFT) descriptors, have been deployed in the ‘Bag of Visual Words’ model (BVW) as an effective method to represent visual content information and to enhance its classification and retrieval. Local features are more useful than global features, e.g. colour, shape or texture, as they are invariant to image scale, orientation and camera angle. An innovative approach is proposed for the representation, annotation and retrieval of visual content using a hybrid technique based upon the use of an unstructured visual word and upon a (structured) hierarchical ontology KB model. The structural model facilitates the disambiguation of unstructured visual words and a more effective classification of visual content, compared to a vector space model, through exploiting local conceptual structures and their relationships. The key contributions of this framework in using local features for image representation include: first, a method to generate visual words using the semantic local adaptive clustering (SLAC) algorithm which takes term weight and spatial locations of keypoints into account. Consequently, the semantic information is preserved. Second a technique is used to detect the domain specific ‘non-informative visual words’ which are ineffective at representing the content of visual data and degrade its categorisation ability. Third, a method to combine an ontology model with xi a visual word model to resolve synonym (visual heterogeneity) and polysemy problems, is proposed. The experimental results show that this approach can discover semantically meaningful visual content descriptions and recognise specific events, e.g., sports events, depicted in images efficiently. Since discovering the semantics of an image is an extremely challenging problem, one promising approach to enhance visual content interpretation is to use any associated textual information that accompanies an image, as a cue to predict the meaning of an image, by transforming this textual information into a structured annotation for an image e.g. using XML, RDF, OWL or MPEG-7. Although, text and image are distinct types of information representation and modality, there are some strong, invariant, implicit, connections between images and any accompanying text information. Semantic analysis of image captions can be used by image retrieval systems to retrieve selected images more precisely. To do this, a Natural Language Processing (NLP) is exploited firstly in order to extract concepts from image captions. Next, an ontology-based knowledge model is deployed in order to resolve natural language ambiguities. To deal with the accompanying text information, two methods to extract knowledge from textual information have been proposed. First, metadata can be extracted automatically from text captions and restructured with respect to a semantic model. Second, the use of LSI in relation to a domain-specific ontology-based knowledge model enables the combined framework to tolerate ambiguities and variations (incompleteness) of metadata. The use of the ontology-based knowledge model allows the system to find indirectly relevant concepts in image captions and thus leverage these to represent the semantics of images at a higher level. Experimental results show that the proposed framework significantly enhances image retrieval and leads to narrowing of the semantic gap between lower level machinederived and higher level human-understandable conceptualisation.

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Ouhimmou, Mustapha. "An Integrated Planning Model for Multi-Supplier, Multi-Facility, Multi-Customer, Multi-Product and Multi-Period: Application to the Wood Furniture Industry." Thesis, Université Laval, 2009. http://www.theses.ulaval.ca/2009/26513/26513.pdf.

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Coskun, Adem. "Downlink Transmission Techniques For Multi User Multi Input Multi Output Wireless Communications." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/2/12608750/index.pdf.

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Multi-user MIMO (MIMO-MU) communication techniques make use of available channel state information at the transmitter to mitigate the inter-user interference. The goal of these techniques is to provide the least interference at the mobile stations by applying a precoding operation. In this thesis a comparison of available techniques in the literature such as Channel Decomposition, SINR Balancing, Joint-MMSE optimization is presented. Novel techniques for the MIMO multi-user downlink communication systems, where a single stream is transmitted to each user are proposed. The proposed methods, different from the other methods in the literature, use a simple receiver to combat the interference. It has been shown that MRC based receivers are as good as more complicated joint MMSE receivers.

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Hanzouli, Houda. "Analyse multi échelle et multi observation pour l'imagerie multi modale en oncologie." Thesis, Brest, 2016. http://www.theses.fr/2016BRES0126/document.

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Ce travail s’inscrit dans le cadre du développement d’une médecine davantage personnalisée et préventive, pour laquelle la fusion d’informations multi modale et de différentes représentations d'une même modalité sont nécessaires afin d'aboutir à une quantification fiable des images médicales en oncologie. Dans cette étude nous présentons deux applications de traitement et d'analyse des images médicales: le débruitage des images TEP et la détermination des volumes anatomo-fonctionnels des tumeurs en imagerie multi modale TEP/TDM. Pour le débruitage des images TEP, nous avons mis en place une approche intitulée "WCD" permettant de bénéficier des caractéristiques complémentaires de la transformée en ondelettes et la transformée en Curvelets afin de mieux représenter les structures isotropiques et anisotropiques dans ces images, ce qui permet de réduire le bruit tout en minimisant les pertes d'informations utiles dans les images TEP. En ce qui concerne la deuxième application, nous avons proposé une méthode de segmentationTEP/TDM intitulée "WCHMT" permettant d'exploiter la spécificité des arbres de Markov caché de prendre en compte les dépendances statistiques entre l’ensemble des données. Ce modèle permet de gérer simultanément les propriétés complémentaires de l’imagerie fonctionnelle et l’imagerie morphologique dans un cadre unifié où les données sont représentées dans le domaine des Contourlets. Le débruitage en TEP a abouti à une hausse significative du rapport signal sur-bruit (SNR) en garantissant la moindre variation de l'intensité et du contraste local. Quant à la segmentation multimodale TEP/TDM, elle a démontré une bonne précision lors de la détermination du volume tumoral en terme du coefficient de Dice (DSC) avec le meilleur compromis entre la sensibilité (SE) et la valeur prédictive positive (PPV) par rapport à la vérité terrain
This thesis is a part of the development of more personalized and preventive medicine, for which a fusion of multi modal information and diverse representations of the same modality is needed in order to get accurate and reliable quantification of medical images in oncology. In this study we present two applications for image processing analysis: PET denoising and multimodal PET/CT tumor segmentation. The PET filtering approach called "WCD" take benefit from the complementary features of the wavelet and Curvelets transforms in order to better represent isotropic and anisotropic structures in PET images. This algorithm allows the reduction of the noise while minimizing the loss of useful information in PET images. The PET/CT tumor segmentation application is performed through a Markov model as a probabilistic quadtree graph namely a Hidden Markov Tree (HMT).Our motivation for using such a model is to provide fast computation, improved robustness and an effective interpretational framework for image analysis on oncology. Thanks to two efficient aspects (multi observation and multi resolution), when dealing with Hidden Markov Tree (HMT), we exploit joint statistical dependencies between hidden states to handle the whole data stack. This model called "WCHMT" take advantage of the high resolution of the anatomic imaging (CT) and the high contrast of the functional imaging (PET). The denoising approach led to the best trade-off between denoising quality and structure preservation with the least quantitative bias in absolute intensity recovery. PET/CT segmentation's results performed with WCHMT method has proven a reliable segmentation when providing high Dice Similarity Coeffcient (DSC) with the best trade-off between sensitivity (SE) and positive predictive value (PPV)

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Munawar, Mohammad Ahmad. "Multi-interface Multi-channel wireless mesh networks." Thesis, University of Waterloo, 2004. http://hdl.handle.net/10012/875.

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In this thesis we propose a multi-channel wireless network based on nodes that use multiple 802. 11 radio interfaces. The proposed system is singular, as it does not require new hardware or a new MAC, but instead leverages commodity 802. 11-based products. With this system, we target scenarios where the nodes are stationary and where their location can often be controlled. We evaluate the performance in this setup using an ad-hoc network approach whereby nodes generate as well as forward data. We also present and appraise a purely-wireless multi-channel infrastructure, which operates like the WLAN infrastructure-based networks in existence today, but without any fixed-line support. In such an infrastructure nodes dedicated for routing purposes provide wireless connectivity to users. We show that a multi-interface system provide significantly higher capacity in many scenarios. Our work puts forward various challenges, points to various anomalies in the operation of the 802. 11 MAC protocol, and shows the need to tackle unfairness issues. Our experiments demonstrate that the mere use of more dual-interface nodes does not necessarily create higher capacity. We also show that traffic differentiation significantly increases aggregate throughput in realistic scenarios. Finally, we provide an example of how simple channel-allocation algorithms in controlled random topologies can allow us to take advantage of a multi-interface system.

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Ndjeng, Ndjeng Alexandre. "Localisation robuste multi-capteurs et multi-modèles." Thesis, Evry-Val d'Essonne, 2009. http://www.theses.fr/2009EVRY0013/document.

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De nombreux travaux de recherches sont menés depuis quelques années dans le but de fournir une solution précise et intègre au problème de la localisation de véhicules routiers. Ces recherches sont en majorité fondées sur la théorie probabiliste de l’estimation. Elles utilisent la fusion multi-capteurs et le filtrage de Kalman mono-modèle, au travers de variantes adaptées aux systèmes non linéaires ; l’unique modèle complexe étant supposé décrire toute la dynamique du véhicule. Nous proposons dans cette thèse une approche multi-modèles. Cette étude dérive d’une analyse modulaire de la dynamique du véhicule, c’est-à-dire que l’espace d’évolution est pris comme un espace discret : plusieurs modèles simples et dédiés chacun à une manœuvre particulière sont générés, ce qui améliore la robustesse face aux défauts de modélisation du système. Il s’agit d’une variante de l’algorithme IMM, qui prend en compte l’asynchronisme des capteurs embarqués dans le processus d’estimation de l’état du véhicule. Pour cela, une nouvelle modélisation sous contraintes est développée, ce qui permet de mettre à jour la vraisemblance des modèles intégrés même en l’absence de mesures provenant de capteurs extéroceptifs. Toutefois, la performance d’un tel système nécessite d’utiliser des données capteurs de bonne qualité. Plusieurs opérations sont présentées, illustrant la correction du biais des capteurs, des bruits de mesures ainsi que la prise en compte de l’angle de dévers de la chaussée. La méthodologie développée est validée à travers une comparaison avec les algorithmes de fusion probabilistes EKF, UKF, DD1, DD2 et le filtrage particulaire. Cette comparaison est fondée sur des mesures courantes de précision et de confiance, puis sur l’utilisation de critères statistiques de consistance et de crédibilité, à partir de scénarios synthétiques et ensuite des données réelles
Many research works have been devoted in the last years in order to provide an accurate and high integrity solution to the problem outdoor vehicles localization. These research efforts are mainly based on the probability estimation theory. They use multi-sensor fusion approach and a single-model based Kalman filtering, through some variants adapted to nonlinear systems. The single complex model that is used is assumed to describe the dynamics of the vehicle. We rather propose a multiple model approach in this thesis. The presented study derives from a modular analysis of the dynamics of the vehicle, ie the evolution of the vehicle is considered as a discrete process, which combines several simple models. Each model is dedicated to a particular manoeuvre of the vehicle. This evolution space discretizing will improves the system robustness to modelling defects. Our approach is a variant of the IMM algorithm, which takes into account the asynchronism of the embedded sensors. In order to achieve this goal, a new system constrained modelling is developed, which allows to update the various models likelihood even in absence of exteroceptive sensors. However, the performance of such a system requires the use of good quality data. Several operations are presented, illustrating the corrections on the sensors bias, measurements noise and taking into account the road bank angle. The developed methodology is validated through a comparison with the probabilistic fusion algorithms EKF, UKF, DD1, DD2 and particle filtering. This comparison is based on measurements of accuracy and confidence, then the use of statistical consistency and credibility measures, from simulation scenarios and then real data

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Baskar, Siddharth. "Architecture for Multi Input Multi Output CompressiveRadars." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1503302518672948.

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Niessner, Jennifer. "Multi-scale modeling of multi-phase-multi-component processes in heterogeneous porous media." Stuttgart Inst. für Wasserbau, 2006. http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-27697.

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Morlat, Pierre-François. "Evaluation globale des performances d'un récepteur multi-antennes, multi-standards et multi-canaux." Lyon, INSA, 2008. http://theses.insa-lyon.fr/publication/2008ISAL0133/these.pdf.

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Afin de permettre une amélioration des performances des transmissions radio, et donc une augmentation des débits, les algorithmes de traitement d'antennes sont depuis longtemps utilisés. De plus, la multiplication des standards de communication ainsi que la relative surcharge actuelle du spectre radioélectrique nous encourage à considérer les structures de réception multi-standards et multi-canaux. Dans un tel contexte d'interopérabilité entre les différents modes radio, le concept de Radio Logicielle correspondant à une utilisation réduite des parties hardware au profit de la partie numérique nous apparaît très intéressant. Une structure de réception combinant donc les principes de traitement multi-antennes, multi-canaux et multi-standards (appelée multi-*) à base de Radio Logicielle nous semble être particulièrement innovante et intéressante. Nous nous sommes au cours de cette thèse orienté vers l'étude d'un récepteur multi-antennes, capable de traiter des signaux suivant les standards 802. 11b et 802. 11g et présents dans une bande de 40 MHz (alors qu'un canal WLAN occupe une bande de 20 MHz). De plus, nous proposons une validation globale de notre structure envisagée, de manière à ce que chaque partie critique du récepteur ne fasse pas l'objet d'une étude séparée. Cette étude globale doit permettre de proposer un dimensionnement optimal des algorithmes prévus en fonction du compromis complexité, coût/performances. Les performances de notre structure multi-* sont donc présentés dans cette thèse. Nous considérons d'abord un environnement de ropagation réaliste que nous caractérisons. Ainsi les éventuels écarts entre les performances obtenues et les prévisions théoriques sont justifiés. Ensuite, une prise en compte des différents défauts introduits par l'étage de conversion en bande de base est également proposée et nous montrons que le traitement d'antenne permet un relâchement des contraintes hardware. Enfin, une architecture numérique capable de traiter simultanément deux canaux WLAN reçus sur plusieurs antennes est proposée en vue d'une implantation matérielle
A multi-antenna receiver structure able to deal with two 802. 11 b and/or 802. 11 g signais simultaneously in a 40 MHz bandwidth (different to the classical WLAN bandwidth 20 MHz) is defined in this thesis. This structure seems to be very relevant in order to increase QoS taking into account problem of spectral resources. Moreover, a global system evaluation scheme of the multi-* structure is proposed. So, each critical part of the receiver is not considered separately but in a global system approach. First of all, the benefits of the SIMO processing, taking into realistic propagation conditions is given in several multi-* configurations. Ln a second part of the work, it is showed the capability of the 1 x2 SI MO processing to mitigate the effect of RF impairments. After all, a numerical architecture ensuring the processing of both WLAN channels simultaneously received by the multi-branches is validate in order to develop a material demonstrator

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Azad, Hedayat. "Multi-service, multi-rate and multi-environment hybrid spread spectrum CDMA for mobile communications." Thesis, King's College London (University of London), 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.271427.

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Lu, Qin. "A parallel multi-block/multi-physics approach for multi-phase flow in porous media /." Digital version accessible at:, 2000. http://wwwlib.umi.com/cr/utexas/main.

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Teixeira, de Oliveira Carina. "Conception et optimisation de performance inter-couches dans les réseaux maillés radio multi-canal multi-interface." Thesis, Grenoble, 2012. http://www.theses.fr/2012GRENM056/document.

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Dans cette thèse, nous nous concentrons sur la conception et l’optimisation de performances inter-couches dans les réseaux maillés radio multi-canal multi-interface. Afin de profiter de l'augmentation de la capacité de ces réseaux, un certain nombre de problèmes doit être résolu. La première contribution de cette thèse est une nouvelle classification et une évaluation formelle des différentes stratégies d’assignation de canaux et d’interfaces. Nous adressons en particulier la connectivité en termes de formation de topologie, densité de connexions et découverte de voisinage. La deuxième contribution présente des algorithmes de broadcast fonctionnant pour n’importe quelle stratégie d’assignation multi-canal multi-interface. Ces algorithmes garantissent qu’un paquet de broadcast est délivré avec une probabilité minimale à tous les voisins. La troisième contribution de cette thèse propose d’évaluer la capacité (débit) obtenue à travers les différentes solutions d’assignation de canaux et d’interfaces. Plus précisément, nous proposons trois formulations de programmation linéaire mixte pour modéliser le routage et les contraintes de partage de bande passante en présence d'interférences. Nous dérivons ensuite des bornes supérieures et inférieures pour deux stratégies MAC différentes. Notre dernière contribution propose de développer une solution de routage inter-couches pour les réseaux maillés multi-canal multi-interface. En particulier, nous proposons une métrique de qualité de lien estimant la bande passante résiduelle d'un lien. Un protocole de routage adapté permet ensuite de trouver les routes offrant le meilleur débit. Toutes nos contributions sont validées par des nombreuses simulations qui démontrent l'efficacité de nos solutions. En résumé, cette thèse fournit une analyse en profondeur des réseaux maillés radio multi-canal multi-interface, ainsi que des lignes directrices pour les concepteurs de réseaux afin de déployer des réseaux performants
In this PhD thesis, we focus on the design and performance optimization of multi-channel multi-interface wireless mesh networks. To take advantage of the increased capacity in such networks, a number of issues has to be handled properly. The first contribution of this thesis is a novel classification and formal evaluation of different channel and interface assignment strategies. In particular, we focus on connectivity in terms of topology formation, density of connections, and neighbor discovery. Our second contribution presents broadcast algorithms able to handle any of the multi-channel multi-interface assignment strategies. These algorithms guarantee a broadcast packet to be delivered with a minimum probability to all neighbors. The third contribution of this thesis consists in evaluating the network capacity (i.e., throughput) obtained through the different channel and interface assignments schemes. More specifically, we propose three mixed integer linear programming formulations to model the routing and bandwidth sharing constraints in presence of interference. We derive then upper and lower bounds for different MAC strategies. The fourth and last contribution of this thesis is the development of a novel cross-layer routing solution for multi-channel multi-interface mesh networks. In particular, we propose a link-quality aware metric to estimate the residual bandwidth of a link. An on-demand routing protocol selects the routes offering the best throughput. All our contributions are validated through extensive simulations that demonstrate the efficiency of our solutions. In summary, this thesis provide insight into the improvement of multi-channel multi-interface wireless mesh networks, as well as guidelines for network designers in planning efficient deployments

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OKADA, Hiraku, Nobuyuki NAKAGAWA, Tadahiro WADA, Takaya YAMAZATO, and Masaaki KATAYAMA. "Multi-Route Coding in Wireless Multi-Hop Networks." IEICE, 2006. http://hdl.handle.net/2237/9581.

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Okada, Hiraku, Nobuyuki Nakagawa, Tadahiro Wada, Takaya Yamazato, and Masaaki Katayama. "Multi-Route Coding in Wireless Multi-Hop Networks." IEICE, 2006. http://hdl.handle.net/2237/7836.

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Song, Chuan. "Multi-resource allocation across multi projects by subcontractor." [Gainesville, Fla.] : University of Florida, 2005. http://purl.fcla.edu/fcla/etd/UFE0011878.

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Dissertations / Theses on the topic 'Mulit'

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