To see the other types of publications on this topic, follow the link: Uniformly distributed.
Dissertations / Theses on the topic 'Uniformly distributed'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 48 dissertations / theses for your research on the topic 'Uniformly distributed.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
1
Tandon, Surinder Kumar. "Deformations of helical fibres under uniformly and non-uniformly distributed compressive forces." Thesis, University of Leeds, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.235516.
Full text
2
SAMPAIO, LUIZ EDUARDO BITTENCOURT. "ANALYSIS OF GEODESIC LENSES WITH UNIFORMLY DISTRIBUTED FEEDERS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2000. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=7494@1.
Full textAbstract:
PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIROLentes eletromagnéticas têm sido usadas desde a década de 50 como forma de se obter uma antena com apontamento eletrônico e alta diretividade, capaz de operar numa vasta faixa de freqüências. Por este motivo, tornaram-se populares, principalmente em aplicações de Guerra Eletrônica. Entretanto, uma de suas desvantagens é que, a cada momento, apenas uma fonte emissora é usada para um certo apontamento. Esta tese propõe um novo tipo de lentes geodésica em que se emprega uma distribuição de fontes uniforme sobre a entrada da lente, sendo que todas elas sempre emitem com a mesma potência, independentemente da direção escolhida para o feixe. Os mesmos objetivos são atingidos - diretividade, ampla faixa de freqüências de operação e apontamento eletrônico. Assim, todas as fontes contribuem para a potência total irradiada, com a mesma amplitude, sendo o apontamento obtido pela adequada escolha da fase de cada uma destas fontes. Acrescenta-se que tal dispositivo possui menor queda de desempenho, numa situação de falha de uma ou mais fontes. Dois modelos teóricos para a análise e projeto da estrutura - um baseado na ótica geométrica e outro em técnicas modais - são apresentados e comparados.
Electromagnetic lenses have been applied since early 50´s as a means of obtaining an electronic steerable antenna with high directivity and broadband range of operation. For this reason, they have became very popular in Electronic warfare applications. Some of their weakness, however, would be the fact that only one feed point (supply) - and all the associated circuitry - can be used at a time, in order to generate a single bean in the radiated field. The purpose of this these is to propose a new kind of geodesic lens in which the same goals are obtained (high directivity, broadband range of frequencies, and electronic steering) but with an uniform distribution of feeding along the lens input, all the supplies used at all times, no matter what the direction chosen for the output bean. Therefore, all the feeding points are radiating the same amount of power (same amplitude), the electronic steering is obtained by properly setting the phases of the several supplies at the input of the lens. Moreover, the device proposed here has less degradation of performance when one or a few supplies go down. Two theoretic models for the analysis and design of such device - one based on the geometric optics and the other based on modal techniques - are also provided and compared.
3
Drizen, Andy L. "Generating uniformly-distributed random generalised 2-designs with block size 3." Thesis, Queen Mary, University of London, 2012. http://qmro.qmul.ac.uk/xmlui/handle/123456789/8517.
Full textAbstract:
Generalised t-designs, defined by Cameron, describe a generalisation of many combinatorial objects including: Latin squares, 1-factorisations of K2n (the complete graph on 2n vertices), and classical t-designs. This new relationship raises the question of how their respective theory would fare in a more general setting. In 1991, Jacobson and Matthews published an algorithm for generating uniformly distributed random Latin squares and Cameron conjectures that this work extends to other generalised 2-designs with block size 3. In this thesis, we divide Cameron’s conjecture into three parts. Firstly, for constants RC, RS and CS, we study a generalisation of Latin squares, which are (r c) grids whose cells each contain RC symbols from the set f1;2; : : : ; sg such that each symbol occurs RS times in each column and CS times in each row. We give fundamental theory about these objects, including an enumeration for small parameter values. Further, we prove that Cameron’s conjecture is true for these designs, for all admissible parameter values, which provides the first method for generating them uniformly at random. Secondly, we look at a generalisation of 1-factorisations of the complete graph. For constants NN and NC, these graphs have n vertices, each incident with NN coloured edges, such that each colour appears at each vertex NC times. We successfully show how to generate these designs uniformly at random when NC 0 (mod 2) and NN NC. Finally, we observe the difficulties that arise when trying to apply Jacobson and Matthews’ theory to the classical triple systems. Cameron’s conjecture remains open for these designs, however, there is mounting evidence which suggests an affirmative result. A function reference for DesignMC, the bespoke software that was used during this research, is provided in an appendix.
4
Tribble, Seth D. "Markov chain monte carlo algorithms using completely uniformly distributed driving sequences /." May be available electronically:, 2007. http://proquest.umi.com/login?COPT=REJTPTU1MTUmSU5UPTAmVkVSPTI=&clientId=12498.
Full text
5
Mkhaliphi, Mkhuseli Bruce. "Reconstruction of Functions From Non-uniformly Distributed Sampled Data in Shift-Invariant Frame Subspaces." Master's thesis, Faculty of Engineering and the Built Environment, 2018. http://hdl.handle.net/11427/30079.
Full textAbstract:
The focus of this research is to study and implement efficient iterative reconstruction algorithms. Iterative reconstruction algorithms are used to reconstruct bandlimited signals in shift-invariant L2 subspaces from a set of non-uniformly distributed sampled data. The Shannon-Whittaker reconstruction formula commonly used in uniform sampling problems is insufficient in reconstructing function from non-uniformly distributed sampled data. Therefore new techniques are required. There are many traditional approaches for non-uniform sampling and reconstruction methods where the Adaptive Weights (AW) algorithm is considered to be the most efficient. Recently, the Partitions of Unity (PoU) algorithm has been suggested to outperform the AW although there has been much literature covering its numerical performance. A study and analysis of the implementation of the Adaptive Weights (AW) and Partitions of Unity (PoU) reconstruction methods is conducted. The algorithms consider the missing data problem, defined as reconstructing continuous-time (CT) signals from non-uniform samples which resulted from missing samples on a uniform grid. Mainly, the algorithms convert the non-uniform grid to a uniform grid. The implemented iterative methods construct CT bandlimited functions in frame subspaces. Bandlimited functions are considered to be a superposition of basis functions, named frames. PoU is a variation of AW, they differ by the choice of frame because each frame produces a different approximation operator and convergence rate. If efficiency is defined as the norm convergence and computational time of an algorithm, then among the two methods, discussed, the PoU method is more efficient. The AW method is slow and converged to a higher error than that of the PoU. However, AW compensates for its slowness and less accuracy by being convergent and robust for large sampling gaps and less sensitive to the sampling irregularities. The impact of additive white Gaussian noise on the performance of the two algorithms is also investigated. The numerical tools utilized in this research consist of the theory of discrete irregular sampling, frames, and iterative techniques. The developed software provides a platform for sampling signals under non-ideal conditions with real devices.
6
Di, Tommaso Nicholas. "Influence of concrete strength and uniformly distributed reinforcement ratio on the behaviour of concrete deep beams." Thesis, McGill University, 2013. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=114386.
Full textAbstract:
Six full-scale reinforced concrete deep beams were constructed and tested to investigate the influence of concrete strength on their behaviour. Two levels of uniformly distributed reinforcement steel were tested for three pairs of deep beams with different concrete strengths to determine the influence of the reinforcement ratio on performance. Simple strut-and-tie models, refined strut-and-tie models, and sectional analysis are used to predict the behaviour of the specimens and to verify design approaches. It was found that increased concrete strength resulted in an increase in the ratio of the bearing stress at crushing to the compressive strength of the concrete. An increase in the reinforcement ratio from 0.2% to 0.3% resulted in smaller crack widths at service load level.Six poutres profondes de grandeur réelle en béton armé ont été construits et testés pour étudier l'influence de la résistance du béton sur leur comportement. Deux niveaux d'armature distribuée uniformément ont été testés pour trois paires de poutres profondes avec des bétons de différentes résistances pour étudier l'influence du ratio d'armature sur la performance. Des modèles de bielle et tirant simples, des modèles de bielle et tirants plus complexes, et l'analyse par section sont utilisés pour prédire le comportement des spécimens et pour vérifier les approches de conception. Une augmentation de la résistance du béton a entraîné une augmentation du ratio de la contrainte d'écrasement à la résistance du béton en compression. Une augmentation du ratio d'armature de 0.2% à 0.3% a entraîné une diminution de la largeur des fissures à la charge de service.
7
Tseng, Ya-Ting. "Three-Dimensional Model of Solid Ignition and Ignition Limit by a Non-Uniformly Distributed Radiant Heat Source." Case Western Reserve University School of Graduate Studies / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=case1307551796.
Full text
8
Rocchi, Kevin. "The Behaviour of Plank (Tongue and Groove) Wood Decking Under the Effects of Uniformly Distributed and Concentrated Loads." Thèse, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/26183.
Full textAbstract:
Plank (tongue and groove) wood decking is a product that is commonly used in post and beam timber construction to transfer gravity loads on roofs and floors. In 2010, The National Building Code of Canada changed the application area of the specified concentrated roof live loads from 750 mm x 750 mm to 200 mm x 200 mm. The change was made to better reflect the area which a construction worker with equipment occupies. Preliminary analysis showed that the change in the application area of concentrated loads may have a significant impact on the design of decking systems. Little research or development has been done on plank decking since the 1950’s and 1960’s.
An experimental program was undertaken at the University of Ottawa’s structural laboratory to better understand the behaviour of plank decking under uniformly distributed and concentrated loads. Non-destructive and destructive tests were conducted on plank decking systems to investigate their stiffness and failure mode characteristics under uniformly distributed as well as concentrated loads. The experimental test program was complimented with a detailed finite element model in order to predict the behaviour of a plank decking system, especially the force transfer between decks through the tongue and groove joint.
The study showed that the published deflection coefficients for uniformly distributed loads can accurately predict the three types of decking layup patterns specified in the Canadian Design Standard (CSA O86, 2009). For unbalanced uniformly distributed loads on two-span continuous layup, it was found that the deflection coefficient of 0.42 was non-conservative.
It was also found that under concentrated loads, the stiffness of the decking system increased significantly as more boards were added. A deflection coefficient of 0.40 is appropriate to calculate the deflection for the three types of decking layup patterns specified in the Canadian Design Standard (CSA O86, 2009) under concentrated load on an area of 200 mm by 200 mm. Significant load sharing was observed for plank decking under concentrated loads. An increase in capacity of about 1.5 to 2.5 times the capacity of the loaded boards was found.
Furthermore, it was found that placing sheathing on top of a decking system had a significant effect in the case of concentrated load with an increase of over 50% in stiffness and over 100% in ultimate capacity.
9
Logan, Philip James. "A Planar Pseudo-Rigid-Body Model for Cantilevers Experiencing Combined Endpoint Forces and Uniformly Distributed Loads Acting in Parallel." Scholar Commons, 2015. http://scholarcommons.usf.edu/etd/5730.
Full textAbstract:
This dissertation describes the development and effectiveness of a mathematical model used to predict the behavior of cantilever beams whose loading conditions include parallel combinations of evenly distributed loads and endpoint forces. The large deflection of cantilever beams has been widely studied. A number of models and mathematical techniques have been utilized in predicting the endpoint path coordinates and load-deflection relationships of such beams. The Pseudo-Rigid-Body Model (PRBM) is one such method which replaces the elastic beam with rigid links of a parameterized pivot location and torsional spring stiffness. In this paper, the PRBM method is extended to include cases of a constant distributed load combined with a parallel endpoint force. The phase space of the governing differential equations is used to store information relevant to the characterization of the PRBM parameters. Correction factors are also given to decrease the error in the load-deflection relationship and extend the angular range of the model, thereby further aiding compliant mechanism design. The calculations suggest a simple way of representing the effective torque caused by a distributed load in a PRBM as a function of easily calculated model parameters.
10
Ncube, Noah, and Stephen Sabaa. "Non-uniformly distributed compression perpendicular to the grain in steel-CLT connections : Experimental and Numerical Analysis of bearing capacity and displacement behaviour." Thesis, Linnéuniversitetet, Institutionen för byggteknik (BY), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-90646.
Full textAbstract:
Previous studies have mainly focused on the behaviour of timber under uniformly distributed compression perpendicular to the grain (CPG) loads. However, there are many practical applications in which timber is loaded by non-uniformly distributed CPG loads. Different design and test codes like the Eurocode 5 (EC5), DIN 1052:2004, ASTM D143- 94 and EN-408:2010 only account for load configurations where timber is subjected to uniformly distributed loads. For specific uniformly distributed load (UDL) configurations the bearing capacity of timber (solid softwood timber or Glulam) in compression is adapted by using a load configuration factor (kc,90) according to EC5, the European code for design of timber structures. EC5 has no guidelines for cross-laminated timber (CLT) under UDL with the exception of the Austrian National Regulations for EC5. In this work, an experimental and numerical study on the bearing capacity and displacement behaviour of CLT subjected to non-uniformly distributed loading (NuDL) is conducted on eight different load configurations. A steel-CLT connection in which the CLT is partially loaded is used in this study. Finite element modelling, performed using the commercial software Abaqus CAE is used as the numerical simulation of the experimental study and is validated by experimental results. Load configuration factors (kc,90) from experimental results are compared with values from the Swedish CLT handbook (KL-Trähandbok). The outcome of the study shows that load configuration factor for NuDL cases is higher than for UDL cases. Hence, for same load configurations a lower CPG strength is required in NuDL than in UDL. Moreover, numerical results feature overall good congruence with the elastic phase of the experiments and have the potential to augment experiments in further understanding other complex steel-CLT connections
11
Luboya, Silhady Tshitende. "Finite element methods applied to boundary value problems derived from the deflection curve of a beam under the action of a point and a uniformly distributed load." Thesis, Linnéuniversitetet, Institutionen för matematik (MA), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-79196.
Full textAbstract:
In this thesis, we analyze a roller - pinned supported beam of length L subjected to a point load at a distance `1 and a uniformly distributed load over the entire span of the beam. The aim of this study is to determine the slope and the vertical deflection curve of the beam. The analysis is conducted by applying the finite element method, which consists of dividing the whole domain into geometrically simple subdomains, namely elements. The analysis is then performed for each subdomain separately. The approximate solution is obtained by assembling all the elements. The problem is reduced into solving a system of linear algebraic equations. It can be expressed in the matrix form as A = where A is the stiffness matrix, the vector of nodal variables, and the load vector. The finite element method has produced a solution close to the analytical solution.The finite element solution is improved by increasing the number of elements with variablestep sized element. The error based on the L2-norm with respect to the displacement is presented as well as the condition number of the stiffness matrix. The finite element method is implemented in Matlab, and the diagram of the deflected beam is presented.
12
Haq, Ikram. "Fraud detection for online banking for scalable and distributed data." Thesis, Federation University Australia, 2020. http://researchonline.federation.edu.au/vital/access/HandleResolver/1959.17/171977.
Full textAbstract:
Online fraud causes billions of dollars in losses for banks. Therefore, online banking fraud detection is an important field of study. However, there are many challenges in conducting research in fraud detection. One of the constraints is due to unavailability of bank datasets for research or the required characteristics of the attributes of the data are not available. Numeric data usually provides better performance for machine learning algorithms. Most transaction data however have categorical, or nominal features as well. Moreover, some platforms such as Apache Spark only recognizes numeric data. So, there is a need to use techniques e.g. One-hot encoding (OHE) to transform categorical features to numerical features, however OHE has challenges including the sparseness of transformed data and that the distinct values of an attribute are not always known in advance. Efficient feature engineering can improve the algorithm’s performance but usually requires detailed domain knowledge to identify correct features. Techniques like Ripple Down Rules (RDR) are suitable for fraud detection because of their low maintenance and incremental learning features. However, high classification accuracy on mixed datasets, especially for scalable data is challenging. Evaluation of RDR on distributed platforms is also challenging as it is not available on these platforms. The thesis proposes the following solutions to these challenges: • We developed a technique Highly Correlated Rule Based Uniformly Distribution (HCRUD) to generate highly correlated rule-based uniformly-distributed synthetic data. • We developed a technique One-hot Encoded Extended Compact (OHE-EC) to transform categorical features to numeric features by compacting sparse-data even if all distinct values are unknown. • We developed a technique Feature Engineering and Compact Unified Expressions (FECUE) to improve model efficiency through feature engineering where the domain of the data is not known in advance. • A Unified Expression RDR fraud deduction technique (UE-RDR) for Big data has been proposed and evaluated on the Spark platform. Empirical tests were executed on multi-node Hadoop cluster using well-known classifiers on bank data, synthetic bank datasets and publicly available datasets from UCI repository. These evaluations demonstrated substantial improvements in terms of classification accuracy, ruleset compactness and execution speed.Doctor of Philosophy
13
Schnellmann, Daniel. "Viana maps and limit distributions of sums of point measures." Phd thesis, KTH, Matematik (Inst.), 2009. http://tel.archives-ouvertes.fr/tel-00694201.
Full textAbstract:
This thesis consists of five articles mainly devoted to problems in dynamical systems and ergodic theory. We consider non-uniformly hyperbolic two dimensional systems and limit distributions of point measures which are absolutely continuous with respect to the Lebesgue measure. Let $f_{a_0}(x)=a_0-x^2$ be a quadratic map where the parameter $a_0\in(1,2)$ is chosen such that the critical point $0$ is pre-periodic (but not periodic). In Papers A and B we study skew-products $(\th,x)\mapsto F(\th,x)=(g(\th),f_{a_0}(x)+\al s(\th))$, $(\th,x)\in S^1\times\real$. The functions $g:S^1\to S^1$ and $s:S^1\to[-1,1]$ are the base dynamics and the coupling functions, respectively, and $\al$ is a small, positive constant. Such quadratic skew-products are also called Viana maps. In Papers A and B we show for several choices of the base dynamics and the coupling function that the map $F$ has two positive Lyapunov exponents and for some cases we further show that $F$ admits also an absolutely continuous invariant probability measure. In Paper C we consider certain Bernoulli convolutions. By showing that a specific transversality property is satisfied, we deduce absolute continuity of the to these Bernoulli convolutions associated distributions. In Papers D and E we consider sequences of real numbers in the unit interval and study how they are distributed. The sequences in Paper D are given by the forward iterations of a point $x\in[0,1]$ under a piecewise expanding map $T_a:[0,1]\to[0,1]$ depending on a parameter $a$ contained in an interval $I$. Under the assumption that each $T_a$ admits a unique absolutely continuous invariant probability measure $\mu_a$ and that some technical conditions are satisfied, we show that the distribution of the forward orbit $T_a^j(x)$, $j\ge1$, is described by the distribution $\mu_a$ for Lebesgue almost every parameter $a\in I$. In Paper E we apply the ideas in Paper D to certain sequences which are equidistributed in the unit interval and give a geometrical proof of an old result by Koksma.
14
Feuilloley, Laurent. "Local certification in distributed computing : error-sensitivity, uniformity, redundancy, and interactivity." Thesis, Sorbonne Paris Cité, 2018. http://www.theses.fr/2018USPCC086/document.
Full textAbstract:
Cette thèse porte sur la notion de certification locale, un sujet central en décision distribuée, un domaine du calcul distribué. Le mécanisme de la décision distribuée consiste, pour les nœuds d'un réseau, à décider de manière distribuée si le réseau est dans une configuration correcte ou non, selon un certain prédicat. Cette décision est dite locale, car les nœuds du réseau ne peuvent communiquer qu'avec leurs voisins. Après avoir communiqué, chaque nœud prend une décision, exprimant si le réseau est correct ou non localement, c'est-à-dire correct étant donné l'information partielle récoltée jusque-là. Le réseau est déclaré correct globalement s'il est déclaré correct localement par tous les nœuds.Du fait de la contrainte de localité, peu de prédicats peuvent être vérifiés de cette manière. La certification locale est un moyen de contourner cette difficulté, et permet de décider tous les prédicats. C'est un mécanisme qui consiste à étiqueter les nœuds du réseau avec ce que l'on appelle des certificats, qui peuvent être vérifiés localement par un algorithme distribué. Un schéma de certification locale est correct si seuls les réseaux dans une configuration correcte peuvent être certifiés. L'idée de la certification locale est non seulement séduisante d'un point de vue théorique, comme une forme de non-déterminisme distribué, mais c'est surtout un concept très utile pour l'étude des algorithmes tolérants aux pannes, où une étape-clé consiste à vérifier l'état du réseau en se basant sur des informations stockées par les nœuds.Cette thèse porte sur quatre aspects de la certification locale : la sensibilité aux erreurs, l'uniformité, la redondance et l'interactivité. L'étude de ces quatre sujets est motivée par une question essentielle : comment réduire les ressources nécessaires à la certification et/ou permettre une meilleure tolérance aux pannes? Pour aborder cette question, il est nécessaire de comprendre le mécanisme de certification en profondeur. Dans cette optique, dans cette thèse, nous apportons des réponses aux questions suivantes. À quel point les certificats doivent-ils être redondants, pour assurer une certification correcte? Les schémas de certification classiques sont-ils robustes à un changement de la condition de correction? Le fait d'introduire de l'interactivité dans le processus change-t-il la complexité de la certification?This dissertation is about local certification, a central topic in distributed decision, a subfield of distributed computing. The distributed decision mechanism consists, for the nodes of a network, in deciding in a distributed manner whether the network is in a proper configuration or not, with respect to some fixed predicate. This decision is said to be local because the nodes of the network can communicate only with their neighbours. After communication, every node outputs a decision, stating whether the network is locally correct, that is, correct given the partial information gathered so far by this node. The network is declared to be globally correct, if and only if, it is declared to be locally correct by every node.Most predicates cannot be verified by this type of computation, due to the locality constraint. Local certification is a mechanism that enables to circumvent this difficulty, and to check any property. It consists in providing the nodes of the network with labels, called certificates, that can be verified locally by a distributed algorithm. A local certification scheme is correct if only the networks that satisfy the predicate can be certified. In addition to its theoretical appeal, as a form of distributed non-determinism, the concept of local certification is especially relevant in the study of fault-tolerant distributed algorithms, where a key step consists in checking the status of the network, based on information stored at the nodes.This dissertation deals with four aspects of local certification: error-sensitivity, uniformity, redundancy, and interactivity. The study of these four topics is motivated by the same essential question: How to reduce the resources needed for certification, and/or ensure a better fault-tolerance? In order to tackle this question we have to understand fundamental properties of certification. In particular, in this dissertation we answer questions such as: How redundant the certificates need to be for a proper certification? Are the classic certification protocols robust to a strengthening of the acceptance condition? and, How does introducing interactivity in the process changes the complexity of certification?
15
Keezhanatham, Seshadri Jayashree. "Uniform Field Distribution Using Distributed Magnetic Structure." Thesis, Virginia Tech, 2014. http://hdl.handle.net/10919/24820.
Full textAbstract:
Energy distribution in a conventional magnetic component is generally not at a designer's disposal. In a conventional toroidal inductor, the energy density is inversely proportional to the square of the radius. Thus, a designer would be unable to prescribe uniform field distribution to fully utilize the inductor volume for storing magnetic energy.
To address this problem a new inductor design, called a "constant-flux" inductor, is introduced in this thesis. This new inductor has the core and windings configured to distribute the magnetic flux and energy relatively uniformly throughout the core volume to achieve power density higher than that of a conventional toroidal inductor. The core of this new inductor design is made of concentric cells of magnetic material, and the windings are wound in the gaps between the cells. This structure is designed to avoid crowding of the flux, thus ensuring lower core energy losses. In addition, the windings are patterned for shorter length and larger area of cross-section to facilitate lower winding energy losses.
Based on this approach, a set of new, constant flux inductor/transformer designs has been developed. This design set is based on specific input parameters are presented in this thesis. These parameters include the required inductance, peak and rms current, frequency of operation, permissible dc resistance, material properties of the core such as relative permeability, maximum permissible magnetic flux density for the allowed core loss, and Steinmetz parameters to compute the core loss. For each constant flux inductor/transformer design, the winding loss and core loss of the magnetic components are computed. In addition, the quality factor is used as the deciding criterion for selection of an optimized inductor/transformer design.
The first design presented in this thesis shows that for the same maximum magnetic field intensity, height, total stored energy, and material, the footprint area of the new five-cell constant-flux inductor is 1.65 times less than that of an equivalent conventional toroidal inductor. The winding loss for the new inductor is at least 10% smaller, and core loss is at least 1% smaller than that in conventional inductors. For higher energy densities and taller inductors, an optimal field ratio of the dimensions of each cell (α = Rimin/Rimax) and a larger number of cells is desired. However, there is a practical difficulty in realizing this structure with a larger number of cells and higher field ratio α. To address this problem, an inductor design is presented that has a footprint area of a three-cell constant-flux inductor (α = 0.6) that is 1.48 times smaller in comparison to an equivalent conventional toroidal inductor. For the same maximum magnetic flux density, height, material, and winding loss, the energy stored in this new three-cell constant-flux inductor (α = 0.6) is four times larger than that of an equivalent conventional toroidal inductor.
Finally, new designs for application-specific toroidal inductors are presented in this thesis. First, a constant-flux inductor is designed for high-current, high-power applications. An equivalent constant-flux inductor to a commercially available inductor (E70340-010) was designed. The height of this equivalent inductor is 20% less than the commercial product with the same inductance and dc resistance. Second, a constant-flux inductor design of inductance 1.2 µH was fabricated using Micrometal-8 for the core and flat wire of 0.97 mm x 0.25 mm for the conductor. The core material of this inductor has relative permeability < 28 and maximum allowed flux density of 3600 Gauss. The dc resistance of this new, constant flux inductor was measured to be 14.4 mΩ.Master of Science
16
Robinson, D. C. "Domains : a uniform approach to distributed system management." Thesis, Imperial College London, 1988. http://hdl.handle.net/10044/1/47231.
Full text
17
Lemson, Gerard. "Statistics and dynamics of the perturbed universe." [S.l. : [Groningen] : s.n.] ; [University Library Groningen] [Host], 1995. http://irs.ub.rug.nl/ppn/140954694.
Full text
18
Reed, G. M. "A uniform mathematical theory for real-time distributed computingT." Thesis, University of Oxford, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233548.
Full text
19
Jeffreys, Steven. "Uniform Access to Signal Data in a Distributed Heterogeneous Computing Environment." International Foundation for Telemetering, 1992. http://hdl.handle.net/10150/611956.
Full textAbstract:
International Telemetering Conference Proceedings / October 26-29, 1992 / Town and Country Hotel and Convention Center, San Diego, CaliforniaOne of the problems in analyzing data is getting the data to the analysis system. The data can be stored in a variety of ways, from simple disk and tape files to a sophisticated relational database system. The variety of storage techniques requires the data analysis system to be aware of the details of how the data may be accessed (e.g., file formats, SQL statements, BBN/Probe commands, etc.). The problem is much worse in a network of heterogeneous machines; besides the details of each storage method, the analysis system must handle the details of network access, and may have to translate data from one vendor format to another as it moves from machine to machine. This paper describes a simple and powerful software interface to telemetry data in a distributed heterogeneous networking environment, and how that interface is being used in a diagnostic expert system. In this case, the interface connects the expert system, running on a Sun UNIX machine, with the data on a VAX/VMS machine. The interface exists as a small subroutine library that can be linked into a variety of data analysis systems. The interface insulates the expert system from all details of data access, providing transparent access to data across the network. A further benefit of this approach is that the data source itself can be a sophisticated data analysis system that may perform some processing of the data, again transparently to the user of the interface. The interface subroutine library can be readily applied to a wide variety of data analysis applications.
20
Alptekin, Gokhan. "Geometric formation with uniform distribution and movement in formation of distributed mobile robots." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1996. http://handle.dtic.mil/100.2/ADA313808.
Full text
21
Yang, Yik. "Generating Generalized Exponentially Distributed Random Variates with Transformed Density Rejection and Ratio-of-Uniform Methods." Thesis, Virginia Tech, 2004. http://hdl.handle.net/10919/31623.
Full textAbstract:
To analyze a communication system without the aid of simulation, the channel noise for the simulation must be assumed to be normal. The assumption is often valid, but the normal distribution may not be able to model the channel noise adequately in some environments. This thesis will explore the generalized exponential distribution for better noise modeling and robustness testing in communication system.
When using the generalized exponential distribution for the channel noise, the analysis will become analytically intractable, and simulation becomes mandatory. To generate the noise with the distribution, the rejection method can be used. However, since the distribution can take on different shapes, finding the appropriate Upper Bounding Function (UBF) for the method is very difficult. Thus, two modified versions of the rejection method will be examined. They are the Transformed Density Rejection (TDR) and Ratio-of-Uniform (RoU) method; their quality, efficient, trade-offs, etc will be discussed.
Choosing TDR, a simulation of a BPSK communication system will be performed.
With the simulation, it can further ascertain that the random variates generated by TDR can be used to model the channel noise and to test the robustness of a communication system.Master of Science
22
Isenor, Glenn David. "A novel approach to the reduction of a distributed feedback laser's intensity profile non-uniformity using global optimization." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/NQ63477.pdf.
Full text
23
Calvillo, Jesús [Verfasser], and Matthew W. [Akademischer Betreuer] Crocker. "Connectionist language production : distributed representations and the uniform information density hypothesis / Jesús Calvillo ; Betreuer: Matthew W. Crocker." Saarbrücken : Saarländische Universitäts- und Landesbibliothek, 2019. http://d-nb.info/1187240958/34.
Full text
24
Calvillo, Jesús Verfasser], and Matthew W. [Akademischer Betreuer] [Crocker. "Connectionist language production : distributed representations and the uniform information density hypothesis / Jesús Calvillo ; Betreuer: Matthew W. Crocker." Saarbrücken : Saarländische Universitäts- und Landesbibliothek, 2019. http://nbn-resolving.de/urn:nbn:de:bsz:291--ds-279340.
Full text
25
Cui, Han. "Constant-Flux Inductor with Enclosed-Winding Geometry for Improved Energy Density." Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/34722.
Full textAbstract:
The passive components such as inductors and capacitors are bulky parts on circuit boards. Researchers in academia, government, and industry have been searching for ways to improve the magnetic energy density and reduce the package size of magnetic parts. The â constant-fluxâ concept discussed herein is leveraged to achieve high magnetic-energy density by distributing the magnetic flux uniformly, leading to inductor geometries with a volume significantly lower than that of conventional products. A relatively constant flux distribution is advantageous not only from the density standpoint, but also from the thermal standpoint via the reduction of hot spots, and from the reliability standpoint via the suppression of flux crowding.
For toroidal inductors, adding concentric toroidal cells of magnetic material and distributing the windings properly can successfully make the flux density distribution uniform and thus significantly improve the power density.
Compared with a conventional toroidal inductor, the constant-flux inductor introduced herein has an enclosed-winding geometry. The winding layout inside the core is configured to distribute the magnetic flux relatively uniformly throughout the magnetic volume to obtain a higher energy density and smaller package volume than those of a conventional toroidal inductor.
Techniques to shape the core and to distribute the winding turns to form a desirable field profile is described for one class of magnetic geometries with the winding enclosed by the core. For a given set of input parameters such as the inductorâ s footprint and thickness, permeability of the magnetic material, maximum permissible magnetic flux density for the allowed core loss, and current rating, the winding geometry can be designed and optimized to achieve the highest time constant, which is the inductance divided by resistance (L/Rdc).
The design procedure is delineated for the constant-flux inductor design together with an example with three winding windows, an inductance of 1.6 µH, and a resistance of 7 mΩ. The constant-flux inductor designed has the same inductance, dc resistance, and footprint area as a commercial counterpart, but half the height.
The uniformity factor α is defined to reflect the uniformity level inside the core volume. For each given magnetic material and given volume, an optimal uniformity factor exists, which has the highest time constant. The time constant varies with the footprint area, inductor thickness, relative permeability of the magnetic material, and uniformity factor. Therefore, the objective for the constant-flux inductor design is to seek the highest possible time constant, so that the constant-flux inductor gives a higher inductance or lower resistance than commercial products of the same volume. The calculated time-constant-density of the constant-flux inductor designed is 4008 s/m3, which is more than two times larger than the 1463 s/m3 of a commercial product.
To validate the concept of constant-flux inductor, various ways of fabrication for the core and the winding were explored in the lab, including the routing process, lasing process on the core, etching technique on copper, and screen printing with silver paste. The most successful results were obtained from the routing process on both the core and the winding. The core from Micrometals has a relative permeability of around 22, and the winding is made of copper sheets 0.5 mm thick. The fabricated inductor prototype shows a significant improvement in energy density: at the same inductance and resistance, the volume of the constant-flux inductor is two times smaller than that of the commercial counterpart.
The constant-flux inductor shows great improvement in energy density and the shrinking of the total size of the inductor below that of the commercial products. Reducing the volume of the magnetic component is beneficial to most power. The study of the constant-flux inductor is currently focused on the dc analysis, and the ac analysis is the next step in the research.Master of Science
26
Simatic, Michel. "Contributions au rendement des protocoles de diffusion à ordre total et aux réseaux tolérants aux délais à base de RFID." Phd thesis, Conservatoire national des arts et metiers - CNAM, 2012. http://tel.archives-ouvertes.fr/tel-00787598.
Full textAbstract:
Dans les systèmes répartis asynchrones, l'horloge logique et le vecteur d'horloges sont deux outils fondamentaux pour gérer la communication et le partage de données entre les entités constitutives de ces systèmes. L'objectif de cette thèse est d'exploiter ces outils avec une perspective d'implantation. Dans une première partie, nous nous concentrons sur la communication de données et contribuons au domaine de la diffusion uniforme à ordre total. Nous proposons le protocole des trains : des jetons (appelés trains) circulent en parallèle entre les processus participants répartis sur un anneau virtuel. Chaque train est équipé d'une horloge logique utilisée pour retrouver les train(s) perdu(s) en cas de défaillance de processus. Nous prouvons que le protocole des trains est un protocole de diffusion uniforme à ordre total. Puis, nous créons une nouvelle métrique : le rendement en termes de débit. Cette métrique nous permet de montrer que le protocole des trains a un rendement supérieur au meilleur, en termes de débit, des protocoles présentés dans la littérature. Par ailleurs, cette métrique fournit une limite théorique du débit maximum atteignable en implantant un protocole de diffusion donné. Il est ainsi possible d'évaluer la qualité d'une implantation de protocole. Les performances en termes de débit du protocole des trains, notamment pour les messages de petites tailles, en font un candidat remarquable pour le partage de données entre coeurs d'un même processeur. De plus, sa sobriété en termes de surcoût réseau en font un candidat privilégié pour la réplication de données entre serveurs dans le cloud. Une partie de ces travaux a été implantée dans un système de contrôle-commande et de supervision déployé sur plusieurs dizaines de sites industriels. Dans une seconde partie, nous nous concentrons sur le partage de données et contribuons au domaine de la RFID. Nous proposons une mémoire répartie partagée basée sur des étiquettes RFID. Cette mémoire permet de s'affranchir d'un réseau informatique global. Pour ce faire, elle s'appuie sur des vecteurs d'horloges et exploite le réseau formé par les utilisateurs mobiles de l'application répartie. Ainsi, ces derniers peuvent lire le contenu d'étiquettes RFID distantes. Notre mémoire répartie partagée à base de RFID apporte une alternative aux trois architectures à base de RFID disponibles dans la littérature. Notre mémoire répartie partagée a été implantée dans un jeu pervasif qui a été expérimenté par un millier de personnes.
27
Duperrier, Cédric. "Développement d'un logiciel d'assistance à la conception des circuits non linéaires microondes : Application à l'amplification distribuée non uniforme de puissance à très large bande en technologie MMIC." Limoges, 2001. http://www.theses.fr/2001LIMO0053.
Full textAbstract:
Le thème essentiel de cette thèse concerne l'étude des différentes méthodologies et critères de conception d'amplificateur de puissance non linéaires aux fréquences microondes. Les travaux présentés dans ce manuscrit sont divisés en deux parties : -Réalisation d'un amplificateur distribué de puissance en technologie MMIC délivrant 1W sur la bande de fréquence 4-18GHz pour contre mesures avioniques. En collaboration avec Thalès Microwave, une topologie originale d'amplificateur distribué de puissance a été réalisée afin d"évaluer le potentiel de la filière pHEMT de la fonderie Trinquint Semiconductor Texas pour l'amplification de puissance en large bande. La conception de cet amplificateur a permis de concevoir une nouvelle topologie d'amplificateur distribué de puissance, dite non uniforme ( constitué de transistors de développement différent) et de développer les méthodologies d'optimisation propres à ce types de circuit. -Création d'un assistant d' aide à la conception d'amplificateurs de puissance microondes et millimétriques. Dans le cadre d'un programme de recherche en collaboration avec le CNES,un assistant d'aide à la conception des circuits non linéaires microondes a été développé. L'objectif est de mettre à la disposition des concepteurs, un outil informatique à même de les guider efficacement dans leurs démarches de conception et de leur faciliter l'implémentation de méthodes adaptées afin de leur permettre de passer de plus en plus de temps sur les problèmes de conception et le développement de solutiosn innovantesThe main theme of this thesis relates to the study of various methodology and design criteria of non-linear power amplifier at microwave frequencies. The work presented in this manuscript can be divided in main parts : -Realization of a MMIC power distributed amplifier exhibiting 1W on the frequency bandwidth 4-18Ghz -Development of electronic assistant tool for the design of microwave power amplifiers
28
Yen, Hsin-Chieh, and 顏昕頡. "On Uniformly Distributed Sequences." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/50736570125963460255.
Full text
29
Shih, Hsi-Wei, and 史習偉. "Properties of Uniformly Distributed Measure." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/49987488786643623153.
Full textAbstract:
碩士國立臺灣大學
數學研究所
89
In this essay, we consider the so called uniformly distributed measure over R^n. In [P], geometric properties for such measures had been derived. Practically, all the main results and conclusions in [P] are all based upon behavior of approximation of momentsof the measure Φ by polynomial in s to certain order when s → ∞ and when s↘0. To investigate the support of a measure, we usually look at its tangent measures so that a global view for its support can be obtain. For this purpose, we try to look more closely these moments, and, for comparison,to give other approaches to obtain some of results in [P].
30
Li, Keh-Tsong, and 李克聰. "Uniformly Distributed Simplex Sliding-Mode Control." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/14054369761815147802.
Full textAbstract:
博士國立交通大學
電機與控制工程系所
93
This dissertation presents a novel control technology for multi-input systems, called uniformly distributed simplex sliding-mode control (UDSSMC), to deal with matched disturbances. The UDSSMC is mainly designed based on the uniformly distributed simplex set, which contains vectors of unit magnitude and distributed uniformly in the control space. Two approaches are proposed to obtain the uniformly distributed simplex set easily and directly. By employing the uniformly distributed simplex set, a new concise scheme is introduced to quickly determine the sub-region where the system trajectory currently stays and a specific smoothing strategy is presented to ameliorate the chattering problem caused by switching functions. Most importantly, it is theoretically shown that the upper-bounded matched disturbances can be eliminated by UDSSMC. Furthermore, a grey prediction is adopted to forecast the matched disturbances and thus no prior information concerning their upper bounds are required. Finally, the success of UDSSMC is demonstrated by the tracking control of robotic manipulators.
31
Hwang, Yihn-Liang, and 黃印良. "Uniformly Distributed Measures in R^n." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/18985258621432098557.
Full textAbstract:
碩士國立交通大學
應用數學系
88
In this thesis we study the uniformly distributed measures in R^n . Some basic properties of these measures and their tangent cones are proved in details. We also give an application of these properties in the last section: Let $\Phi$ be a nonzero measure over $\brn$, and $m\le n$ be an integer so that $\Phi(B(x,r))=\alpha(m)*r^{m}$, for every $x\in\spt\Phi$ and every $r>0$. In case of $m=0,1,2,n$, there is an $m$ affine subspace $V$ of $\brn$ such that $\Phi=H^m| V$. Most of the results in this thesis may be found in David Preiss'' paper ([P]).
32
TSENG, KUO-CHUAN, and 曾國銓. "Wafermap Analysis for Non-uniformly Distributed Clusters." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/t6r4tm.
Full textAbstract:
碩士中華大學
電機工程學系碩士在職專班
101
In this study, a quantitative detect model has be proposed for defect wafer map of semiconductor. The model combines with the probability theory, spatial correlation and process parameters, to monitor the wafer state in the production process in real-time, and then provide follow-up product yield improvement of basic, to reduce costs and improve yields.
33
Chong, Chan-Sheang, and 莊振祥. "Noise reduction using arrays of non-uniformly distributed microphones." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/x46qwr.
Full textAbstract:
碩士國立交通大學
電信工程研究所
104
Over the past few decades, speech enhancement algorithms using a single- microphone or multiple- microphones have been developed in various processing domains. In recent years, hybrid systems for speech enhancement were proposed to overcome the performance limitation of individual noise reduction techniques, which are usually derived in different domains and require the accurate information of the noise field. In this thesis, we demonstrate two microphone-array algorithms (the proposed system 1 and 2) with non-uniformly distributed three microphones for speech enhancement in directional interferences and diffuse white noise. These two array algorithms are derived in the unified power spectral density domain. Both of them have a post filter based on prior knowledge of the noise field for diffuse noise suppression. To cope with directional interference, the proposed system 1 and 2 have a post filter used interaural time difference (ITD) information and estimates of the signal-to-noise ratio (SNR) at closely spaced dual-microphone respectively. Several experiments are designed to compare the performance of proposed algorithms with performance of other multi-microphone algorithms using objective measures. In terms of objective PESQ and LSD measures, the proposed system 2 with non-uniformly distributed three microphones outperforms the compared algorithms with linear distributed five microphones. Moreover, it has been shown that the cascaded system in the proposed system 1 is more effective in eliminating directional speech interference and diffuse white noise than each individual suppression technique, and it is also the same to compared with a multichannel filtering technique which adjust the de-noising tradeoff between coherent and incoherent noise based on the orthogonal signal decomposition on noise. Furthermore, according to the evaluation results from real recording, the proposed systems have been shown that they are feasible in practical low-reverberant condition.
34
Ceekala, Mithun. "STOCHASTIC ADC WITH RANDOM U-QUADRATIC DISTRIBUTED REFERENCE VOLTAGES TO UNIFORMLY DISTRIBUTE COMPARATORS TRIP POINTS." 2013. http://hdl.handle.net/10222/21911.
Full textAbstract:
This thesis presents a new architecture of stochastic Analog-to-Digital converter (ADC). A standard Stochastic ADC uses comparator random offset as the trip point while all the comparators have the same reference voltages. Since the offset of a basic comparator depends on a number of independent random variables, the offset will follow randomly distributed Gaussian function. The input dynamic range of this standard stochastic ADC is ±?. For 90nm technology ? value is around 153mV. A technique is presented that converts overall transfer function of a stochastic ADC i.e. Gaussian distribution into almost uniformly distribution with a wider range. With the proposed technique, an input dynamic range of ± 153mV and ENOB of 4bits of standard stochastic ADC are increased to variable input dynamic range of ±250mV to ±500mV and ENOB of 6bits.
35
Chung, Kai-Yu, and 鍾凱聿. "Dynamic response of elastic constrained beam under uniformly distributed moving load." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/84463012222394484491.
Full textAbstract:
碩士國立中興大學
應用數學系所
98
This paper focuses on the dynamic response of an elastic constrained beam under uniform-distribution moving loads. Based on the Euler-Bernoulli beam theory, the beam is assumed to be homogeneous and isotropic. The boundary conditions are simply supported at both ends with rotational constrain. The uniform-distribution load is expressed as a step function. Using Newton’s Second Law, the equation of equilibrium can be derived. The natural frequencies and corresponding mode-shape functions are obtained by solving the equation with the corresponding boundary conditions. Applying mode superposition method, we can approximate the response of the beam. In numerical analysis, a 4th order Runge-Kutta method was used to evaluated the response of the beam by using the software Maple 9. Cases of different magnitudes of moving loads, various velocities of moving loads, different elastic constrained, multiple moving loads are discussed.
36
Alameddine, Wafic. "Energy efficient relay selection schemes for cooperative uniformly distributed wireless sensor networks." Thesis, 2013. http://spectrum.library.concordia.ca/978206/1/Alameddine_MASc_S2014.pdf.
Full textAbstract:
Wireless sensor networks (WSNs) are commonly used in many applications. The energy efficiency of the system has become the subject of extensive research lately. In this thesis we will introduce relay selection schemes that attempt to optimize the transmission of data. We use a two phase WSN model where a message is broadcasted from the source then relayed by the overhearing sensors (nodes) to a fusion center (FC). These schemes will reduce the number of bits transmitted from the sensors to the destination as well as minimize the activity of these sensors and lead to a more energy efficient system. The main idea is to have the smallest subset of sensors that contain the entire information relay the message; in an ideal situation the subset will only contain a pair of sensors.
We then investigate the addition of error correcting codes (ECCs) to the node-FC channels. We observe the outage probability of the relay selection schemes using turbo codes on the node-FC channels. We also examine the expected number of bits (including extra parity bits) in the transmissions. We show that under certain channel conditions introducing turbo codes to the node-FC channels leads to longer sensor lifetimes.
37
CAI, XIN-YI, and 蔡行益. "CO oxidation on non-uniformly distributed Pt/Al2 O3 catalyst and reactor simulation." Thesis, 1986. http://ndltd.ncl.edu.tw/handle/59431058550750844884.
Full text
38
Ting-YiYu and 游婷怡. "Modeling and Analysis of Heterogeneous Cellular Networks with Non-Uniformly-Distributed Energy Harvesting Small Cells." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/5fv96q.
Full textAbstract:
碩士國立成功大學
電腦與通信工程研究所
104
In order to meet the explosive growth of data traffic without contributing to excessive energy consumption and greenhouse gas emission, in this work, we consider a heterogeneous cellular network (HCN) composed of conventional macro cells and energy harvesting (EH) small cells. It is assumed that each small-cell base station (SBS) is able to store the energy harvested from the environment in the battery and provide services when there is sufficient energy to perform downlink transmissions. To capture the randomness of BS locations, instead of modeling the locations of macro cell BSs (MBSs) and SBSs as two mutually independent PPPs that may result in impractically small distances between the BSs of different tiers, we use a non-uniform small cell deployment, in which the SBSs are not deployed in the locations within a predetermined distance away from any MBS. Besides, we consider a load aware model and take the user's throughput requirement into consideration, which is more reasonable for a lightly loaded network. The network outage probability is derived by modeling the battery dynamics of an arbitrary SBS as a discrete-time Markov chain. We provide the simulation results to verify the analysis accuracy and demonstrate the impact of a few key system parameters on the outage probability.
39
Li, Pei-Sia, and 李佩霞. "Mechanical Analysis of Three Spans of FGM Continuous Plate under Uniformly Distributed Load and Thermal Load." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/8cj7k2.
Full textAbstract:
碩士國立臺灣科技大學
營建工程系
100
The main purpose of this thesis is to analyze the mechanical analysis of FGM continuous plates with one opposite edges simply supported and other edges fixed under uniform loads and linear thermal loads. The Young’s modulus of the continuous plates is assumed to vary along thickness direction based on three kinds of functions, which are power-law function, sigmoid function, and exponential function. The coefficient of thermal expansion of the continuous plates is assumed to be constant or functionally distributed along thickness direction. In solving the problem, first, the continuous plate is divided into three individual spans which are further split into some fundamental problems. The solutions of these fundamental problems are obtained by using Fourier Serious expansion. Then the rotation angles at the continuous portions of the FGM continuous plates are solved by using superposition method and the aid of the compatibility conditions in these three individual spans. Consequently, the closed-form solutions of the continuous plate are found by substituting the obtained rotation angles into the fundamental solutions. Finally, the analytical solutions are compared with the numerical solutions obtained by MARC software of finite element method. The mechanical behavior of three types of continuous plates which are FGM plates, FGM coated plates, and FGM undercoated plates are investigated. The influences of the external loads, thermal loads, material properties, and the aspect ratios of the plate are all discussed. The deflections along the y-axis and the stresses, strains along the z-axis are presented and compared with the numerical solutions. Results show that different distributions of Young’s modulus are not present great influences on the displacements of the continuous plates under the same uniformly distributed load and thermal load. However, under the same thermal load, the stresses of FGM continuous plate are strongly affected by the distributions of the Young’s modulus, and the mechanical behaviors are strong influenced by the coefficients of thermal expansion. These phenomena imply that stress behaviors of the continuous FGM plates can be predicted and designed. Moreover, the influence of the uniformly distributed load on the mechanical behaviors of the continuous FGM plates increases as the aspect ratio increases when the linear thermal loads are fixed.
40
Wum, Chin-Sei, and 聞慶璽. "Elastic Stability of Cracked Columns Under the Combined Action of Uniformly Distributed Tangential and Vertical Forces." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/75366798041116968582.
Full text
41
Du, Zhen-yu, and 杜鎮宇. "Mechanical Analysis of FGM Plates with Two Opposite Edges Simply Supported and Two other Edge Beams under Uniformly Distributed Load and Thermal Load." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/27841206260401033861.
Full textAbstract:
碩士國立臺灣科技大學
營建工程系
101
he main purpose of this research is to analyze the mechanical analysis of FGM plates with two opposite edges simply supported and two other edge beams subjected to uniform load by Fourier series expansion.It is assumed that the Poisson’s ratio of the FGM plates remains constant, however the Young’s modulus of the FGM plates vary along the thickness direction. The study is concentrated to three kind of distr- ibutions of Young’s modulus, which are power-law function (P-FGM), sigmoid function (S-FGM), and exponential function (E-FGM). And three type of plates which are FGM plates, FGM coated plates, and FGM undercoated plates are under considered. To obtain the analytical solution, the problem is divided into five topics first, and then according to the principle oof superposition, the edge deflections and edge rotations of the plate are solved. The analytical solution are compared with the numerical solutions obtained by MARC software of finite element method.Result show that the analytical solutions of the stress in the center of the FGM plate, the strains along the z-direction, and the deflections along the y-axies agree very well with the numerical solutions. Moreover, the study is also focused on the effects of the stiffness of the edge beams on the deflections of the FGM plates.
42
Thirumulanathan, D. "Optimal Mechanisms for Selling Two Heterogeneous Items." Thesis, 2017. http://etd.iisc.ernet.in/2005/3782.
Full textAbstract:
We consider the problem of designing revenue-optimal mechanisms for selling two heterogeneous items to a single buyer. Designing a revenue-optimal mechanism for selling a single item is simple: Set a threshold price based on the distribution, and sell the item only when the buyer’s valuation exceeds the threshold. However, designing a revenue-optimal mechanism to sell two heterogeneous items is a harder problem. Even the simplest setting with two items and one buyer remains unsolved as yet. The partial characterizations available in the literature have succeeded in solving the problem largely for distributions that are bordered by the coordinate axes. We consider distributions that do not contain (0; 0) in their support sets. Specifically, we consider the buyer’s valuations to be distributed uniformly over arbitrary rectangles in the positive quadrant. We anticipate that the special cases we solve could be a guideline to un-derstand the methods to solve the general problem. We explore two different methods – the duality method and the virtual valuation method – and apply them to solve the problem for distributions that are not bordered by the coordinate axes. The thesis consists of two parts.
In the first part, we consider the problem when the buyer has no demand constraints. We assume the buyer’s valuations to be uniformly distributed over an arbitrary rectangle [c1; c1 + b1] [c2; c2 + b2] in the positive quadrant. We first study the duality approach that solves the problem for the (c1; c2) = (0; 0) case. We then nontrivially extend this approach to provide an explicit solution for arbitrary nonnegative values of (c1; c2; b1; b2). We prove that the optimal mechanism is to sell the two items according to one of eight simple menus. The menus indicate that the items must be sold individually for certain values of (c1; c2), the items must be bundled for certain other values, and the auction is an interplay of individual sale and a bundled sale for the remaining values of (c1; c2). We conjecture that our method can be extended to a wider class of distributions. We provide some preliminary results to support the conjecture.
In the second part, we consider the problem when the buyer has a unit-demand constraint. We assume the buyer’s valuations (z1; z2) to be uniformly distributed over an arbitrary rectangle [c; c + b1] [c; c + b2] in the positive quadrant, having its south-west corner on the line z1 = z2. We first show that the structure of the dual measure shows significant variations for different values of (c; b1; b2) which makes it hard to discover the correct dual measure, and hence to compute the solution. We then nontrivially extend the virtual valuation method to provide a complete, explicit solution for the problem considered. In particular, we prove that the optimal mechanism is structured into five simple menus. We then conjecture, with promising preliminary results, that the optimal mechanism when the valuations are uniformly distributed in an arbitrary rectangle [c1; c1 + b1] [c2; c2 + b2] is also structured according to similar menus.
43
Свистун, Дмитро Володимирович, and Dmytro Svystun. "Проект торгово-адміністративної будівлі з дослідженням колон на стиск." Master's thesis, 2019. http://elartu.tntu.edu.ua/handle/lib/30515.
Full textAbstract:
В дипломній роботі виконано проект торгово-адміністративної будівлі. Проведено обробку та аналіз розрахункових даних порівняння збірно-монолітного та збірного перекриття, за дії на них рівномірно-розподіленого статичного експлуатаційного навантаження.The diploma thesis completed the Project of commercial and administrativebuilding. Processingand analysis of the calculated data comparing the precast-monolithic and precast ceilings, with the action of uniformly distributed static operating load on them.
Реферат...3 Вступ...6 1. Архітектурна частина...7 1.1. Вихідні дані на проектування...7 1.2. Генеральний план...8 1.3. Конструктивні рішення...10 1.5. Електропостачання і електроустаткування...12 1.5.1. Електропостачання...12 1.5.2. Радіофікація...14 1.5.3. Телефонізація...14 1.6. Опалення та вентиляція...16 1.6.1. Опалення...16 1.6.2. Вентиляція...16 1.7.Антисейсмічні заходи...17 1.8. Протипожежні заходи...17 1.9. Теплотехнічний розрахунок стінової ОК...18 2. Розрахунково-конструктивна частина...20 2.1. Розрахунок монолітної плити перекриття...20 2.1.1. Збір навантажень на монолітну плиту перекриття...20 2.1.2. Розрахунок плити...21 2.2.3. Вимоги до виконання плити....30 2.2.Розрахунок монолітної залізобетонної колони...31 2.3. Розрахунок фундаменту....39 2.3.1. Розрахунок палі буронабивної...39 2.3.2. Вимоги до монтажу паль...43 2.3.3. Розрахунок ростверку монолітного...43 2.3.4. Розрахунок на прогин...44 2.3.5. Розрахунок на продавлювання...47 2.3.6.Розрахунок паль і пальових ф-тів за деформаціями основ...49 3. Технологія будівельного виробництва...52 3.1. Розробка технологічної карти на монтаж монолітних ростверків...52 3.1.1. Організація і технологія виконання робіт...52 3.1.2. Вибір монтажного крану та бетоновозу...53 3.1.3. Вимоги до якості приймання робіт...56 3.1.4.Матеріально-технічні ресурси...56 3.2. Виконання основних видів робіт....59 3.3. Підрахунок об’єму робіт та калькуляції...63 3.4. Проектування будгенплану...79 3.4.1. Розрахунок площі складів...79 3.4.2. Розрахунок площі АП приміщень...80 3.4.3. Розрахунок електропостачання будівельного майданчику....82 3.4.4. Розрахунокелектричних навантажень...82 3.4.5. Розрахунок загальної потужності електроспоживання...84 3.4.6. Розрахунок тимчасової мережі водопостачання....84 3.4.7. Розрахунок секундної витрати води на вир. потреби...85 3.4.8. Розрахунок секундної витрати води на госп. потреби...85 3.4.9. Розрахунок секундної витрати води на пожежогасіння...86 3.4.10. Вибір діаметру води тимчасового водопроводу...86 4.Економіка...87 5. Розділ з охорони праці....103 5.1. Аналіз шкідливих та небезпечних факторів...103 5.2. Виробнича санітарія...104 5.3. Виробнича безпека...106 5.3.1. Техніка безпеки перед початком робіт...106 5.3.2. Техніка безпеки при виконанні робіт...106 5.4. Пожежна безпека....108 5.4.1. Первинні засоби пожежогасіння...110 6. Безпека в надзвичайних ситуаціях...112 6.1. Коротка характеристика проектованого об’єкту...112 6.2. Зовнішня безпека проектованого об’єкту...112 6.3. Внутрішня безпека проектованого об’єкту...114 6.4. Розрахунок заходів захисту людей на випадок НС...116 6.4.1. Розрахунок місткості захисних приміщень у спорудах...116 6.5.Оцінка захисних властивостей захисних споруд від радіоактивного ураження...118 Висновки....121 Список використаної літератури...122
44
Christou, Ioannis T. "Distributed genetic algorithms for partitioning uniform grids." 1996. http://catalog.hathitrust.org/api/volumes/oclc/36205828.html.
Full text
45
Kao, Wei-Lun, and 高偉倫. "A Distributed Uniform Deployment Algorithm for Mobile Sensor Networks." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/43419640979769769767.
Full textAbstract:
碩士國立中正大學
資訊工程所
95
Assume every sensor in Sensor Network is equipped the ability of moving, and getting geography information of itself. We propose a distributed deployment algorithm, with information of its neighbors in communication range, sensors know where to move can let deployment of sensors density more uniformly.
46
Yildizoglu, Suat Ege. "Distributed parameter-dependent control of non-uniform flexible structures." 2002. http://www.lib.ncsu.edu/theses/available/etd-07242002-154454/unrestricted/etd.pdf.
Full text
47
Wen-HanTsai and 蔡文瀚. "Application of Non-uniform-node-distributed Multiquardrics Meshless Method in Groundwater Flow Simulation." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/92276791358539340019.
Full textAbstract:
碩士國立成功大學
資源工程學系碩博士班
101
Non-uniformly-distributed nodes in meshless method were proposed to overcome the ill-conditioned problem caused by the large number of uniformly-distributed nodes use in global radial basis function collocation method. Both steady and transient groundwater flow problems with analytical solutions in literature are proposed to demonstrate the efficiency of the proposed configurations of non-uniformly-distributed nodes. The results are compared to the one uses uniformly-distributed nodes with the same condition. The groundwater flow problems were designed to explore the effect of coordinate system and boundary conditions. The radial basis function used in RBFCM is multiquardrics (MQ) which contains shape parameters (c). The way of choosing optimal c was explored by performing regressions. Sensitivity analysis of the parameters in MQ-RBFCM focuses on the shape parameter and time parameters for finite difference method. Results showed that by applying the configurations of non-uniformly-distributed nodes, the total number of nodes can be effectively reduced thousands and more to reach the same accuracy compared with uniformly-distributed nodes. For the best configuration of non-uniformly-distributed nodes, the average relative error is down to 0.033 % compared with Theis’s solution before the effect of boundary occuring. In regression analysis, several useful relations between specific distances of source nodes and shape parameter have been derived when applying non-uniformly-node-distributed meshless method in groundwater flow modeling.
48
Chen, Chao-Chun, and 陳朝椿. "Design of a Vehicle LED Rear Fog Lamp with Uniform-Distributed Light Field." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/dq62v7.
Full textAbstract:
碩士國立虎尾科技大學
光電與材料科技研究所
102
In recent years, the rapid development of LED technology , because it has a fast response, long life cycle , low power consumption , small size, directional advantages, it is widely used in lighting and direction of the vehicle driving instructions , warning lights and other functions . Most of the lights are mostly taken direct light or lens mode design, and design application of light guiding the way light species, is limited by the brightness and uniform light effect can not be taking into account , it only applies to running lights design. ECE (Economic Commission for Europe) specifications brake light brightness limit is 60cd, high brake lights is 25cd, the turn signal is 50cd, and running lights are only 4cd, so the way to the light guide to achieve brightness easier running lights , brake lights to achieve the brightness of the above it is difficult , in addition to the need to use high power LED , the need to achieve a good design specification standards. The light guide is designed to evenly light the lamps emitting area in order to achieve uniform light-emitting surface of the visual effects, but it is often thus sacrificing the efficiency of light energy applied to the luminance only reach the desired brightness running lights , can not be applied to other functions . This study focuses on how the application of high-power LED as the light source, the coupling structure to collect light centralized application through, and then use the geometrical optics reflection principle planning, cutting the optical path, and optical simulation software optical shape, light intensity and visual effects simulation to both comply with regulations promulgated by the rear fog lamp (Regulation No. 38) regulate the light intensity on the visual effects, while maintaining acceptable dodging eye effect, and finally made into a physical model for the physical distribution light verified.