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Qiu, Kepeng. "Analysis and optimal design of lightweight sandwich structures and materials". Besançon, 2008. http://www.theses.fr/2008BESA2046.
Pełny tekst źródłaThe thesis deals with the performance analysis and the topology design of lightweight cellular solids and sandwich structures. Special emphasis is devoted to the topological optimization of periodic cellular solids based on the super-element method. The bending static and dynamic analysis and the core design of sandwich panels considering the size effect of cells is developed. The multi-step homogenization method is applied to calculate the effective elastic constants of multi-layered 3D honeycomb sandwich. The effective results are credible by comparison with other methods including classical formula, energy method and engineering empirical method. An integrated topology optimization procedure is developed for the global stiffness maximization of different cellular solids such as cyclic-symmetry square and cylinder structures. Each RVE (representative volume element) of periodic cellular solids is modeled by the SE (super-element) method. The technique of linking the design variables is adopted to ensure the periodicity of the optimal configuration over the whole structure after optimization. The various optimal configurations permit to illustrate the influence of size variation of RVE-SE on the optimal results. The computational efficiency is studied during the optimization process when the super-element method is adopted. A special study on the size effect is carried out for the bending static and dynamic analysis of the core design of sandwich panels. Special attention is devoted to the influence of size effect on the optimal results
HAJHOUJ, MOUAMD. "Programmation hors ligne : emulation des composants d'une cellule robotisee". Paris, ENSAM, 1988. http://www.theses.fr/1988ENAM0005.
Pełny tekst źródłaDiallo, Cheikh-Dieylar. "Study and design of new multibeam antenna architectures in Ku and Ka bands for broadband satellite applications". Thesis, Rennes 1, 2016. http://www.theses.fr/2016REN1S151/document.
Pełny tekst źródłaMulti-beam antennas (MBAs) are crucial to modern and future, civilian and military satellite telecommunications applications. The low part of the electromagnetic spectrum is congested, while wide band of frequencies are available in the Ka-band, in which broadband missions have emerged in the last decade. The trend is reducing the size of spots in multi-beam coverage to reduce the cost of satellites, hence more electrically large antennas are needed, with major technological breakthrough as a consequence. Luneburg lenses in parallel-plate waveguide (PPW) are attractive solutions to excite MBAs, since they could lead to wide band and field-of-view, low loss and cost, easy to design, manufacture and accommodate Beam Forming Networks. This PhD deals with the development of novel implementations and the design of broadband, low loss and wide field-of-view Luneburg lens based MBAs. The implementation of the Luneburg lens is known as a major technological challenge. A state-of-the art of the implementation techniques is presented. Then two novel implementations of Luneburg lens in PPW environment are proposed, like design method, process and tools. The first implementation consists of a periodic and regular array of subwavelength vertical metal posts, where the PPW spacing is variable. The post height and PPW spacing modulate the equivalent refractive index. The all-metal 9-beams antenna designed, manufactured and measured, has 8314 posts and shows excellent performances, better than the traditional constant PPW spacing version. The second implementation consists of periodic and regular array of subwavelength circular holes etched on the copper cladding of a dielectric substrate with an air gap between the holes plane and the PPW top plate. The radius of the holes control the equivalent index. The 5-beams antenna designed has 2696 holes and shows very good performances as compared to similar devices in literature
Bichon, Alexia. "Etude et détection operando, à l'aide d'une électrode de référence, des hétérogénéités de vieillissement liées au design des cellules lithium-ion". Electronic Thesis or Diss., Université Grenoble Alpes, 2024. http://www.theses.fr/2024GRALY009.
Pełny tekst źródłaThe rapid development of lithium-ion batteries for a wide range of applications, particularly electric vehicles, has accelerated the pace of related research. In order to extend their use, improved performance in terms of energy density, safety and charging rate is a major challenge for the current decade. To meet these criteria, a better understanding of degradation mechanisms and their onset conditions is required [1]. In addition, there are several designs and formats of battery cells, and several types of stress. These different designs have an impact on local stresses and therefore on the ageing modes of internal materials. Thus, the aim of this thesis was to better understand the appearance and development of degradation heterogeneities within electrochemical cells using the same materials but with different "designs".For this thesis, we chose to work on cells composed of NMC622 on the positive electrode and graphite + 10 % SiOx on the negative electrode, assembled in several designs, and we studied their ageing under different cycling conditions. Initially, the study focused on the impact of cycling conditions on degradation mechanisms, in order to establish a protocol favorable to ageing. To this end, small-format cells with a single layer of 30 mAh electrodes were manufactured and instrumented with a reference electrode, enabling the evolution of potentials on each electrode to be monitored [2]. Particular attention was paid to studying the potential of the negative electrode and lithium plating, which is largely responsible for the loss of cyclable lithium during fast charging. This first part of the work enabled us to define the ageing protocols suitable for the study carried out on multilayer cells.Cells with a larger capacity, 500 mAh, chemically identical to the previous ones, were produced in the laboratory using two different designs: stacked and prismatic wound. Aged according to identical protocols, these cells enabled us to compare the two designs and identify, for each, the major causes of degradation depending on the type of cycling. Wound cells showed greater ageing heterogeneity than stacked cells.Finally, knowing the main effects of ageing such as: local drying of the electrolyte, decohesion of the active material and clogging of the separator pores, these defects were artificially reproduced during cell manufacturing in order to better understand their respective impact. In this third part, we sought to study how local degradation developed and impacted the ageing of the entire cell. This stage of the work helped to understand the origin of certain heterogeneities.In parallel with this experimental work, a study of the state of the art has enabled us to identify avenues for the integration of electrode-scale heterogeneities within multi-physics models incorporating ageing at the cell scale. This work has opened up a number of prospects for improving multi-physics models and taking account of stress and ageing heterogeneities as a function of cell design.[1] J. S. Edge et al., Phys. Chem. Chem. Phys., vol. 23, no. 14, pp. 8200–8221, 2021, doi: 10.1039/D1CP00359C.[2] O. Chaouachi, et al., Electrochimica Acta, vol. 366, p. 137428, Jan. 2021, doi: 10.1016/j.electacta.2020.137428
Loricourt, Johan. "Réalisation de liaisons céramique-métal par brasage dans une cellule prototype d’électrolyse de la vapeur d’eau à haute température pour la production d’hydrogène". Thesis, Montpellier 2, 2011. http://www.theses.fr/2011MON20037.
Pełny tekst źródłaSteam electrolysis at high temperature and under pressure with protonic conduction electrolyte is a way to produce hydrogen massively at low cost. To operate, an electrolysis cell must be hermetic especially between the anodic compartment (O2 and H2O) and the cathodic one (H2). Thus, ceramic to metal assemblies are needed, either to insert the electrolyte (perovskite-metal junction) or to realize power supply (alumina-metal junction).Considering the operating conditions (873°K, 725 PSI, steam), only a brazing process is possible to realize strong and hermetic junctions.The evaluation of corrosion process under steam pressure has enabled to select a metallic component and a brazing alloy for this application, and has shown that specific alloys are needed.The studies of ceramics metallization by PVD to assure the brazing alloy wetting throughout the brazing process have shown that a barrier diffusion was necessary to avoid the dissolution of coatings when the brazing alloy become liquid.After wetting experimentations of the chosen brazing alloy over the metalized ceramics and the metallic substrate, ceramic to metal assemblies have been optimized in applying the experimental design methodology on standard samples (ASTM).The whole results have enabled to develop hermetic ceramic to metal assemblies having good mechanical properties (Rm = 8700 PSI at 300°K)
Quinton, Cassandre. "Dérivés de s-tétrazine et de triphénylamine : du design aux applications". Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2013. http://tel.archives-ouvertes.fr/tel-00957915.
Pełny tekst źródłaDa, Silva Joao Lucas. "Design and control of a multicell interleaved converter for a hybrid photovoltaic-wind generation system". Phd thesis, Toulouse, INPT, 2017. http://oatao.univ-toulouse.fr/19318/7/DASILVA_JoaoLucas.pdf.
Pełny tekst źródłaHadj, Ahmed Asmaa. "Design of new electrochemical cells for studying enzymes by protein film electrochemistry". Electronic Thesis or Diss., Aix-Marseille, 2022. http://www.theses.fr/2022AIXM0100.
Pełny tekst źródłaProtein Film Electrochemistry (PFE) is a technique in which an enzyme is adsorbed at an electrode and its catalytic turnover rate is measured as an electrical current which allows the investigation of enzyme’s kinetics as a function of different experimental parameters. However, this technique requires fast transport of the substrate towards the electrode. In a previous study, our team proposed a new design based on the wall-tube electrode that provides better transport than the rotating disc electrode, which is commonly used in PFE methods. In this thesis, we explored, using CFD, the effect of the various parameters of the design and proposed semi-empirical formulas to predict the mass transport coefficient and shear stress at the electrode. We used a 3D-printed cell to validate experimentally our predictions. Moreover, we designed and built a new type of wall-tube electrodes with integrated mixers that should allow faster changes of substrate and inhibitor’s concentrations
Moussy, Alice. "Caractérisation des premières étapes de différenciation des cellules hématopoïétiques à l'échelle de la cellule unique". Thesis, Paris Sciences et Lettres (ComUE), 2017. http://www.theses.fr/2017PSLEP029/document.
Pełny tekst źródłaDespite intensively studies, the fundamental mechanisms of cell fate decision during cellular differentiation still remain unclear. The deterministic mechanisms, often based on studies of large cell populations, cannot explain the difference between individual cell fates choices placed in the same environment. The aim of my thesis work is to study the first steps of hematopoietic cell differentiation at the single cell level thanks to transcriptomic, proteomic and morphological analyses. Two differentiation models have been used: T regulatory lymphocytes and human cord blood-derived CD34+ cells. The behavior of individual cells following stimulation has been analyzed. Using time-lapse microscopy coupled to single cell molecular analyses, we could demonstrate that the cell fate choice is not a unique, programmed event. First, the cell reaches a metastable “multi-primed” state, which is characterized by a mixed lineage gene expression pattern. After transition through an “uncertain”, unstable state, characterized by fluctuations between two phenotypes, the cell reaches a stable state. Our observations are coherent with a stochastic model of cell fate decision. The differentiation is likely to be a spontaneous, dynamic, fluctuating and not a deterministic process. The cell fate decisions are taken by individual cells
Barnard, Damian Kelly. "Design and construction of modular genetic devices and the enzymatic hydrolysis of lignocellulosic biomass". Thesis, University of Edinburgh, 2012. http://hdl.handle.net/1842/7688.
Pełny tekst źródłaSlotta, Douglas J. "Structural Design Using Cellular Automata". Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/33368.
Pełny tekst źródłaMaster of Science
Winkworth-Smith, Charles G. "Cellulose composite structures – by design". Thesis, University of Nottingham, 2015. http://eprints.nottingham.ac.uk/28823/.
Pełny tekst źródłaBajic, Mirko M. "Design of dynamic cellular manufacturing systems". Title page, abstract and contents only, 2001. http://web4.library.adelaide.edu.au/theses/09PH/09phb165.pdf.
Pełny tekst źródłaMohebbi, Behzad Barjasteh. "UHF propagation and cellular system design". Thesis, University of Leeds, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305519.
Pełny tekst źródłaLeu, Yow-yuh. "Cellular manufacturing: applicability and system design". Diss., Virginia Tech, 1991. http://hdl.handle.net/10919/39922.
Pełny tekst źródłaPh. D.
Herr, Christiane Margerita. "From form generators to automated diagrams using cellular automata to support architectural design /". Thesis, Click to view the E-thesis via HKUTO, 2008. http://sunzi.lib.hku.hk/hkuto/record/B39848954.
Pełny tekst źródłaGhafari, Bamdad. "Extendable design of a cellular network simulator". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/mq64079.pdf.
Pełny tekst źródłaJones, David Huw. "Design and application of convergent cellular automata". Thesis, Durham University, 2009. http://etheses.dur.ac.uk/84/.
Pełny tekst źródłaWu, Yue. "Computer-aided design of cellular manufacturing layout". Thesis, Durham University, 1999. http://etheses.dur.ac.uk/1464/.
Pełny tekst źródłaEgilmez, Gokhan. "Stochastic Cellular Manufacturing System Design and Control". Ohio University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1354351909.
Pełny tekst źródłaFeng, Song. "Exploring design principles of cellular information processing". Thesis, University of Warwick, 2015. http://wrap.warwick.ac.uk/79687/.
Pełny tekst źródłaBONIFAZI, MAURIZIO. "Analog circuits design for cellular neural network". Doctoral thesis, Università degli Studi di Roma "Tor Vergata", 2008. http://hdl.handle.net/2108/705.
Pełny tekst źródłaThe Artificial Neural Network (ANN) paradigm consists of the application of biological “neural” models to the solution of particular problems that often are very hard to solve for the classical “Von Neumann” architectures. Different are the approaches proposed in literature for the implementation of an ANN. Some of them are software implementations only while, others are circuital solutions as full custom digital circuits or programmed FPGAs (Field Programmable Gate Array) as well as analogue circuits and the typology of the implementation certainly depends on the length of the processing time that you believe adequate for the particular application. This thesis is focused on the design of new analogue circuits well suited for Neural Network applications. In particular, the class of the Cellular Neural Networks (CNN), proposed in 1981 by Prof. L.O.Chua (University of California - Berkeley), will be exploited. In this area, the “Laboratorio Circuiti” at University of Rome “Tor Vergata” designed and manufactured several analogue chips devoted to this class of Neural Networks. These chips belong to the Digital Programmable CNN (DPCNN) chip family and present two main features: the digital programmability of the synaptic weights as well as a special architecture oriented to an interconnection structure (i.e. it is possible to carry out large network by connecting together more of these chips). In this thesis work you will find an overview about the Artificial Neural Network, the Cellular Neural Network and the Star Cellular Neural Network: what they are, how they work and why they are useful. In particular, the DP-CNN chip family will be deeply described. This thesis proposes the TD-CNN (Time Division CNN), a particular design strategy, devoted to reduce the silicon area occupation of the a elementary cell in order to improve the VLSI integrability of the network. Moreover, the same time-division strategy will be applied to TD-Star CNN. In particular, these circuits consist of the digitally programmable non-linearity circuits (i.e. the Digital Programmable Transconductance Amplifier - DPTA and Digital Programmable Transconductance Comparator – DTPC) and special circuit for to carry out the multiplexing feature (i.e. the Dynamic Mirror Sample and Hold – DM-SH and the Multiplexer – DM-MUX). Several circuital simulations will be shown in order to study the behavior of this modified architecture and the modifications on the dynamics introduced by the time division strategy.
CORINTO, FERNANDO. "Cellular Nonlinear Networks: Analysis, Design and Applications". Doctoral thesis, Politecnico di Torino, 2005. http://hdl.handle.net/11583/2501297.
Pełny tekst źródłaZheng, Zhihua, i 鄭智華. "Dynamic channel assignment for cellular mobile radio communication systems". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2003. http://hub.hku.hk/bib/B31246333.
Pełny tekst źródłaCraye, Étienne. "De la modélisation à l'implantation automatisée de la commande hiérarchisée de cellules de production flexibles dans l'industrie manufacturière". Lille 1, 1989. http://www.theses.fr/1989LIL10004.
Pełny tekst źródłaHänggi, Martin. "Analysis, design, and optimization of cellular neural networks /". Zürich, 1999. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=13225.
Pełny tekst źródłaCoury, Sergio. "Quantitative models for the design of cellular networks". Thesis, Imperial College London, 1993. http://hdl.handle.net/10044/1/7947.
Pełny tekst źródłaZhang, Changyang. "Energy Ecient Cellular System Design with QoS Assurance". Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-187441.
Pełny tekst źródłaPerreault, David John. "Design and evaluation of cellular power converter architectures". Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/10452.
Pełny tekst źródłaIncludes bibliographical references (p. 155-160).
by David John Perreault.
Ph.D.
Xie, Ruinan. "Design and Manufacturing of Variable Stiffness Cellular Architecture". Thesis, North Dakota State University, 2017. https://hdl.handle.net/10365/31739.
Pełny tekst źródłaWissmann, Kord J. "New design methods for sheet pile cellular structures". Diss., This resource online, 1995. http://scholar.lib.vt.edu/theses/available/etd-07132007-143154/.
Pełny tekst źródła趙家輝 i Ka-fai Chiu. "Structured development of cellular FMS". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1999. http://hub.hku.hk/bib/B31238324.
Pełny tekst źródłaHartka, Thomas Ryan. "Cellular Automata for Structural Optimization on Recongfigurable Computers". Thesis, Virginia Tech, 2004. http://hdl.handle.net/10919/33508.
Pełny tekst źródłaMaster of Science
Mok, Pui-Wing. "Design and Applications of Split-Luciferase Systems in Vitro and in Cellulo". Diss., The University of Arizona, 2014. http://hdl.handle.net/10150/333354.
Pełny tekst źródłaEngelbrecht, Sarah. "Design of meso-scale cellular structure for rapid manufacturing". Thesis, Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/33876.
Pełny tekst źródłaCai, Qibin. "Optimization-based design tools for W-CDMA cellular networks". Ann Arbor, Mich. : ProQuest, 2006. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3218184.
Pełny tekst źródłaTitle from PDF title page (viewed May 23, 2007). Source: Dissertation Abstracts International, Volume: 67-05, Section: B, page: 2813. Adviser: Jeffery L. Kennington. Includes bibliographical references.
El, Sayed Mostafa. "Multiscale mechanics and structural design of periodic cellular materials". Thesis, McGill University, 2011. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=97009.
Pełny tekst źródłaLes matériaux cellulaires périodiques, aussi connus sous le nom de matériaux réseaux, sont constitués d'un grand nombre d'éléments de micro-treillis réticulés qui sont assemblés de manière périodique ; ils sont construits en assemblant un grand nombre de cellules composées d'un petit nombre d'éléments pour former un pavé dont la périodicité peut être infinie. Les matériaux réseaux servent à modifier les propriétés des matériaux solides qui les constituent selon la topologie des cellules ou la densité relative, . Le développement des matériaux réseaux permet d'élargir la gamme de matériaux pouvant servir dans la conception d'applications avancées.Les progrès récents dans cette nouvelle famille de matériaux ont mené à leur regroupement dans deux catégories: les matériaux dominés par le fléchissement et ceux dominés par l'étirement. Les premiers contiennent des matériaux réseaux qui s'affaissent par le fléchissement localisé de leurs cellules, conduisant à des propriétés qui ne sont pas optimales. Les derniers contiennent une topologie de cellules qui s'affaissent par l'étirement de leurs éléments, produisant ainsi une plus grande résistance par unité de masse. Malgré les avancés récentes dans la compréhension du mécanisme d'affaiblissement des matériaux réseaux, certains défis importants demeurent. i) Les modèles existants de structures réseaux périodiques sont applicables à certaines topologies seulement. Une procédure robuste, automatisée et analytique pour caractériser les propriétés mécaniques des matériaux réseaux ayant une topologie microscopique arbitraire doit être développée. ii) La stratégie utilisée dans la littérature pour former la section transversale d'éléments de cellule minces en formes circulaires mène à un affaiblissement des éléments du treillis par gondolement. Pour éviter cet affaissement, les chercheurs ont proposé d'augmenter la taille de la section transversale des éléments microscopiques. Cependant, cette augmentation de la résistance se fait au détriment du poids du matériau. iii) Les matériaux réseaux qui sont dominés par l'étirement offrent des propriétés mécaniques très supérieures à celles des matériaux dominés par le fléchissement. Leur structure, constituée uniquement de topologies triangulaires, pourrait toutefois contenir plusieurs membres superflus qui ajoutent un poids indésirable et un comportement structurel qui ne se conforme pas aisément.Le travail décrit dans cette thèse a pour but d'améliorer les modèles mécaniques existants à plusieurs échelles ainsi que les outils d'analyse structurelle servant à la conception de matériaux réseaux.
王曉曦 i Xiaoxi Wang. "Design of virtual cellular manufacturing systems using genetic algorithms". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2003. http://hub.hku.hk/bib/B42577305.
Pełny tekst źródłaCheung, Hing Keung. "Modelling, design and implementation of a flexible cellular network". Thesis, King's College London (University of London), 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.417009.
Pełny tekst źródłaSarper, H{u00FC}seyin. "Cellular and functional production environments: design methodology and comparison". Diss., Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/81025.
Pełny tekst źródłaPh. D.
Kumar, Guneet. "Design of anion exchange cellulose hydrogel for large proteins". Diss., This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-06062008-163945/.
Pełny tekst źródłaWang, Xiaoxi. "Design of virtual cellular manufacturing systems using genetic algorithms". Click to view the E-thesis via HKUTO, 2003. http://sunzi.lib.hku.hk/hkuto/record/B42577305.
Pełny tekst źródłaNiakan, Farzad. "Design and configuration of sustainable dynamic cellular manufacturing systems". Thesis, Lyon, INSA, 2015. http://www.theses.fr/2015ISAL0123/document.
Pełny tekst źródłaThe most recent revolution in industry (Industrial Revolution 4.0) requires increased flexibility, agility and efficiency in the use of production equipment. Dynamic Cellular Manufacturing System (DCMS) is one of the best production systems to meet such requirements. In addition, the increasing importance of sustainable development forces manufacturers and managers to take account of the environmental and social issues in the design and configuration of manufacturing systems. This thesis focuses on the sustainable configuration of DCMS by proposing three mathematical models. The main challenge of this study is to (i) choose appropriate social and environmental criteria, (ii) integrate them in mathematical models, and (iii) study the impact of these criteria on DCMS. The first model is bi-objective in order to make a trade-off between some social (job opportunity, potential machine hazards, etc.) and economic (various costs related to cell formation) criteria. To get closer to real-life situations, some parameters such as demand, machine-related costs and time capacity of the machines are considered as uncertain. To solve this problem, a robust optimization method is applied to cope with this uncertainty. In the second model, all dimensions of sustainable development are taken into account in a new bi-objective mathematical model. The first objective function models economic criteria (costs) and the second one environmental aspects (production waste), while social issues (mainly Daily Noise Dosage because of computational complexity) are modeled as constraints. Due to the NP-hardness of the problem, a new innovative approach called NSGA II-MOSA is proposed. The last model has three objective functions, one for each dimension of the sustainable development: environmental, social and economic. In order to be close to real life, some parameters of the model are expressed in terms of fuzzy value. We propose a hybridized possibilistic method to deal with uncertainty and an interactive fuzzy approach is considered to solve an auxiliary crisp multi-objective model in order to find trade-off solutions. Finally, the last part of the thesis studies the possibility to apply the three proposed models to the industry thanks to an easier method. A novel optimization-simulation approach is introduced to deal with the configuration of DCMS: (i) the optimization phase operates as scenario fraction method in order to reduce the number of alternative configurations by focusing on strategic and tactical levels; (ii) next, a simulation tool investigates the operational level by studying the performance of each alternative and the interaction between several components of the cells
MARIOT, LUCA. "Cellular Automata, Boolean Functions and Combinatorial Designs". Doctoral thesis, Università degli Studi di Milano-Bicocca, 2018. http://hdl.handle.net/10281/199011.
Pełny tekst źródłaThe goal of this thesis is to investigate Cellular Automata (CA) from the perspective of Boolean functions and combinatorial designs. Besides the inherent theoretical interest, this research also bases its motivation in cryptography, since Boolean functions and combinatorial designs have several applications in the design of Pseudorandom Number Generators (PRNG) and Secret Sharing Schemes (SSS). The contributions presented in this thesis are developed along three main research lines, organized as follows. The first research line concerns the use of heuristic optimization algorithms for designing Boolean functions with good cryptographic properties, to be used as local rules in CA-based PRNG. The main motivation is to improve Wolfram's pseudorandom generator, which has been shown to be vulnerable to two cryptanalytic attacks due to the poor cryptographic properties of rule 30. In this research line, we first develop a discrete Particle Swarm Optimizer (PSO) which explores the space of truth tables of balanced Boolean functions having good nonlinearity, resiliency and propagation criteria. Next, we design a Genetic Algorithm (GA) which works on a different representation of Boolean functions, namely their Walsh spectrum. The second research line deals with vectorial Boolean functions generated by CA global rules. The first contribution investigates the period of preimages of spatially periodic configurations under the action of surjective CA, a problem which is related to the maximum number of players in a CA-based SSS already published in the literature. The second contribution analyzes the cryptographic properties of CA global rules, focusing on their algebraic degree, nonlinearity and differential uniformity. We then adopt a heuristic approach based on Genetic Programming (GP) to evolve S-boxes defined by CA with nonlinearity and differential uniformity. As a last contribution in this research line, we focus on the resiliency criterion and introduce a new cryptographic property for CA-based S-boxes, namely asynchrony immunity. The third research line deals with combinatorial designs generated by CA. We specifically focus on the case of Orthogonal Latin Squares (OLS), since they are equivalent to perfect authentication codes and threshold secret sharing schemes. To this end, our first contribution in this research line concerns the construction and the enumeration of OLS generated through linear CA, leveraging on results from the theory of finite fields. The second contribution, on the other hand, extends the investigation to OLS generated by nonlinear CA, using both a combinatorial approach for exhaustive enumeration and a heuristic approach based on GA and GP.
Shojaeifard, Arman. "Cross-layer design and optimization of heterogeneous cellular mobile networks". Thesis, King's College London (University of London), 2013. https://kclpure.kcl.ac.uk/portal/en/theses/crosslayer-design-and-optimization-of-heterogeneous-cellular-mobile-networks(dfe31556-d8f0-4fdc-a9e3-8f01fed258ed).html.
Pełny tekst źródłaRamanath, Sreenath. "Cell design and resource allocation for small cell networks". Phd thesis, Université d'Avignon, 2011. http://tel.archives-ouvertes.fr/tel-00745594.
Pełny tekst źródłaHunkeler, Stephan. "Topology optimisation in crashworthiness design via hybrid cellular automata for thin walled structures". Thesis, Queen Mary, University of London, 2014. http://qmro.qmul.ac.uk/xmlui/handle/123456789/8295.
Pełny tekst źródłaLi, Zhuo 1982. "Deposition of model viruses on cellulose". Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=116088.
Pełny tekst źródłaKey phrases: bioactive paper, cellulose film, cellulose binding module, bacteriophage T4, evanescent wave light scattering, unassembled protein complex, diffusion kinetics
Azari, Amin. "Energy Efficient Machine-Type Communications over Cellular Networks : A Battery Lifetime-Aware Cellular Network Design Framework". Licentiate thesis, KTH, Kommunikationssystem, CoS, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-194416.
Pełny tekst źródłaQC 20161103
Chae, Jung Kyu. "Plateforme de spécification pour le développement de bibliothèques de cellules et d'IPs". Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066140/document.
Pełny tekst źródłaA design platform (DP) is a total solution to build a System-On-Chip (SOC). DP consists of a set of libraries/IPs, CAD tools and design kits in conformity with the supported design flows and methodologies. The DP specifications provide a wide range of information from technology parameters like Process-Voltage-Temperature (PVT) corners to CAD tools’ information for library/IP development. However, the library/IP developers have difficulties in obtaining the desired data from the existing specifications due to their informality and complexity. In this thesis, we propose methodologies, flows and tools to formalize the DP specifications for their unification and to deal with it. The proposed description is targeting to be used as a reference to generate and validate libraries (standard cells, I/O, memory) as well as complex IPs (PLL, Serdes, etc.). First, we build a suitable data model to represent all required information for library/IP development and then propose a specification language named Library Development Specification based on XML (LDSpecX). Furthermore, we introduce a reference-based method to create a reliable specification in LDSpecX and task-based keywords to efficiently extract data from it. On the basis of the proposed solutions, we develop a specification platform. Experimentally, we develop a standard cell library from the specification creation to library validation by using the specification platform. We show that our approach enables to create a complete and consistent specification with a considerable reduction in time. It also bridges the gap between the specification and current automatic system for rapid library/IP development