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Literatura académica sobre el tema "Lmais"

Autor: Grafiati

Publicado: 25 de mayo de 2024

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Artículos de revistas sobre el tema "Lmais"

Bischoff, Lothar, Nico Klingner, Paul Mazarov, Kilian Lenz, Ryszard Narkowicz, Wolfgang Pilz y Fabian Meyer. "Dysprosium liquid metal alloy ion source for magnetic nanostructures". Journal of Vacuum Science & Technology B 40, n.º 5 (septiembre de 2022): 052802. http://dx.doi.org/10.1116/6.0001837.

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Focused ion beam (FIB) processing has been established as a well-suited and promising technique in R&D in nearly all fields of nanotechnology for patterning and prototyping on the micrometer scale and below. Liquid metal alloy ion sources (LMAISs) represent an alternative to expand FIB application fields beyond all other source concepts. In particular, ions from the rare earth (RE) element Dy are very interesting for local modification of magnetic properties like RE-induced damping in metallic alloys. In this article, various alloys for source preparation were investigated. A promising solution was found in a Cu30Dy70 based LMAIS, which will be introduced in more detail.

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Klingner, Nico, Gregor Hlawacek, Paul Mazarov, Wolfgang Pilz, Fabian Meyer y Lothar Bischoff. "Imaging and milling resolution of light ion beams from helium ion microscopy and FIBs driven by liquid metal alloy ion sources". Beilstein Journal of Nanotechnology 11 (18 de noviembre de 2020): 1742–49. http://dx.doi.org/10.3762/bjnano.11.156.

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While the application of focused ion beam (FIB) techniques has become a well-established technique in research and development for patterning and prototyping on the nanometer scale, there is still a large underused potential with respect to the usage of ion species other than gallium. Light ions in the range of m = 1–28 u (hydrogen to silicon) are of increasing interest due to the available high beam resolution in the nanometer range and their special chemical and physical behavior in the substrate. In this work, helium and neon ion beams from a helium ion microscope are compared with ion beams such as lithium, beryllium, boron, and silicon, obtained from a mass-separated FIB using a liquid metal alloy ion source (LMAIS) with respect to the imaging and milling resolution, as well as the current stability. Simulations were carried out to investigate whether the experimentally smallest ion-milled trenches are limited by the size of the collision cascade. While He+ offers, experimentally and in simulations, the smallest minimum trench width, light ion species such as Li+ or Be+ from a LMAIS offer higher milling rates and ion currents while outperforming the milling resolution of Ne+ from a gas field ion source. The comparison allows one to select the best possible ion species for the specific demands in terms of resolution, beam current, and volume to be drilled.

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Richter, Torsten, Achim Nadzeyka, Paul Mazarov y Fabian Meyer. "GaBiLi - A Novel Focused Ion Beam (FIB) Source for Ion Microscopy and Related Workflows for 3D Tomography with a Top-Down FIB From Liquid Metal Alloy Ion Sources (LMAIS)". Microscopy and Microanalysis 29, Supplement_1 (22 de julio de 2023): 536–37. http://dx.doi.org/10.1093/micmic/ozad067.252.

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Chughtai, S. S. y N. Munro. "Diagonal dominance using LMIs". IEE Proceedings - Control Theory and Applications 151, n.º 2 (1 de marzo de 2004): 225–33. http://dx.doi.org/10.1049/ip-cta:20040202.

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Pratiwi, Nuning Indah, Ni Wayan Efita Sriyanti y Wahyu Indra Satria. "PENDAMPINGAN PROSEDUR PELAPORAN PAJAK PERTAMBAHAN NILAI PADA KLIEN LMATS CONSULTING". JMM (Jurnal Masyarakat Mandiri) 7, n.º 5 (1 de octubre de 2023): 4867. http://dx.doi.org/10.31764/jmm.v7i5.17330.

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Abstrak: Dalam dunia pajak, pajak dibedakan jadi dua jenis pajak: pajak langsung & pajak tidak langsung. PPN ialah pajak tak langsung yang dimasukkan jadi pajak konsumsi dalam negeri, atas barang/jasa. PPN merupakan pajak VAT yang dihasilkan oleh produksi, pengangkutan, usaha, penyediaan jasa yang memerlukan berbagai faktor produksi. Kegiatan Pendampingan Prosedur Pelaporan Pajak Pertambahan Nilai (PPN) Pada Klien LMATS Consulting bertujuan untuk mengimplementasikan pendampingan mengenai pemahaman pada klienLMATS Consulting dalam melakukan pelaporan PPN. Selain itu pengabdian ini juga bertujuan untuk mengetahui mengenai pelaporan PPN yang telah dilakukan oleh LMATS Consulting apakah sudah sesuai dengan peraturan perundang-undangan perpajakan yang telah berlaku di Indonesia. Metode yang diterapkan dalam pelaksanaan kegiatan pengabdian ini menggunakan metode pendampingan dengan 3 (tiga) tahapan, berikut tahapannya: (1) tahap persiapan; (2) tahap pelaksanaan; dan (3) tahap evaluasi. Berdasarkan dari kegiatan pengabdian ini terdapat hasil dari pelaksanaan pendampingan prosedur pelaporan PPN pada klien LMATS Consulting dimana klien dari LMATS Consulting dapat meningkatkan pemahamannya mengenai bagaimana prosedur dari pelaporan PPN ini. Selain itu pemahaman yang sudah di dapat oleh klien LMATS Consulting juga menunjukkan bahwa konsultan telah menyelesaikan deklarasi PPN sesuai peraturan perundang-undangan perpajakan yang berlaku serta tidak mendeteksi adanya hambatan dalam melaksanaannya Sehingga dalam hal ini LMATS Consulting sudah dipercaya dalam melakukan pelaporan pajak pertambahan nilai klien dan dapat menjalin hubungan yang baik dengan klien dari LMATS Consulting.Abstract: In the world of taxes, taxes are divided into two types of taxes: direct taxes & indirect taxes. VAT is an indirect tax that is included as a domestic consumption tax on goods/services. VAT is a VAT tax generated by production, transportation, business, provision of services that require various factors of production. The report "Assistance to Value Added Tax (VAT) Reporting Procedures for LMATS Consulting Clients" aims to implement assistance regarding understanding to LMATS Consulting clients in reporting VAT. Apart from that, this service also aims to find out whether the VAT reporting carried out by LMATS Consulting is in accordance with the tax laws and regulations that apply in Indonesia. The method applied in implementing this service activity uses a mentoring method with 3 (three) stages, the following stages: (1) preparation stage; (2) implementation stage; and (3) evaluation stage. Based on this service activity, there are results from the implementation of assistance with VAT reporting procedures for LMATS Consulting clients where LMATS Consulting clients can increase their understanding of the VAT reporting procedures. Apart from that, the understanding obtained by LMATS Consulting clients also shows that the consultant has completed the VAT declaration in accordance with applicable tax laws and regulations and has not detected any obstacles in implementing it. So in this case LMATS Consulting is trusted in reporting client value added tax and can establish good relationships with clients from LMATS Consulting.

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Apkarian, Pierre y Hoang Duong Tuan. "Parameterized LMIs in Control Theory". SIAM Journal on Control and Optimization 38, n.º 4 (enero de 2000): 1241–64. http://dx.doi.org/10.1137/s036301299732612x.

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FORBES, R. G. y N. N. LJEPOJEVIC. "RECENT PROGRESS IN LMIS THEORY". Le Journal de Physique Colloques 50, n.º C8 (noviembre de 1989): C8–3—C8–8. http://dx.doi.org/10.1051/jphyscol:1989801.

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Radlička, Tomáš y Bohumila Lencová. "Coulomb interactions in Ga LMIS". Ultramicroscopy 108, n.º 5 (abril de 2008): 445–54. http://dx.doi.org/10.1016/j.ultramic.2007.07.004.

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sci, global. "Solving Fourth-Order PDEs using the LMAPS". Advances in Applied Mathematics and Mechanics 12, n.º 4 (junio de 2020): 920–39. http://dx.doi.org/10.4208/aamm.oa-2019-0216.

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Zhang, Yaxiao, Yangzhou Chen y Xiaojun Qu. "Consensus of High-Order Linear Multiagent Systems with Multitype Switching Topologies Based on the Dynamic Dwell Time Approach". Mathematical Problems in Engineering 2016 (2016): 1–8. http://dx.doi.org/10.1155/2016/7396419.

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This paper investigates the consensus problem of high-order continuous-time linear multiagent systems (LMASs) with multitype switching topologies which include both consensusable and unconsensusable communication topologies. A linear transformation is introduced, which equivalently transforms the consensus problem into the stability problem of a corresponding switched system, along with a necessary and sufficient condition to analyze the consensus problem. This paper is aimed at studying the impact of a switching rule on communication topologies for consensus of LMASs. Based on the dynamic dwell time method, a sufficient condition is derived for consensus of LMASs. It is shown that, with switching signals that satisfy this switching rule, LMASs can achieve consensus under directed switching communication topologies. A numerical example is provided to illustrate the effectiveness of the theoretical results.

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Tesis sobre el tema "Lmais"

Claude, Jean-Benoît. "Etude des mécanismes de nanogravure par FIB-LMAIS". Thesis, Aix-Marseille, 2017. http://www.theses.fr/2017AIXM0445/document.

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Les problématiques liées à la diminution de la taille des dispositifs actuels amènent l’industrie à réfléchir à des techniques de gravure ayant des résolutions à l’échelle de l’atome. Dans ce contexte, les techniques de nanostructuration directes sont très bien adaptées et représentent un potentiel important pour un futur proche dans les laboratoires de recherches. Le projet sur lequel j’ai travaillé avait pour but de coupler dans un environnement Ultra-Vide (UHV), un Dual-Beam, composé d’un FIB (Faisceau d’Ions Focalisé) et d’un MEB (Microscope électronique à balayage) et un bâti d’épitaxie par jet moléculaire (MBE), technique ultime en termes de dépôt. Cet environnement UHV répond à la nécessité de propreté absolue des substrats et constitue un moyen pertinent de rendre fonctionnels les dispositifs ainsi élaborés dans des domaines aussi variés que la micro-nanoélectronique, l’optoélectronique, le photovoltaïque, la spintronique, la plasmonique, etc. La connexion sous UHV de la nanofabrication FIB à la croissance MBE représente une voie unique pour fabriquer des structures 3D en alternant des étapes gravure/dépôt. Parmi les différentes applications, nous avons choisi de nous focaliser sur nanostructures de silicium. Le principal challenge pour l’industrie microélectronique et pour les chercheurs est d’être capable de réaliser une optoélectronique entièrement intégrée à base de Si. Cela nécessite de convertir les matériaux à base de Si en absorbeur/émetteur efficaces de lumière. Une des pistes les plus prometteuses pour obtenir une bande interdite directe est de combiner les effets de la fonctionnalisation chimique et du confinement quantique dans les nano-objets
The reduction of device sizes represents a major issue in microelectronic industry which motivates several teams of researchers to develop nanopatterning with atomic resolution. In this context, maskless nanostructuration techniques are well-adapted and have an important potential for the nearest future in labs and industry. The aim of the project I worked on is the connection in a Ultra-High-Vacuum (UHV) environment between a Dual-Beam, equipped with a FIB (Focused Ion Beam) and a SEM (Scanning Electron Microscopy) and a MBE (Molecular Beam Epitaxy) cluster, which is the highest-controlled deposition technique. The UHV environment is the solution for an absolute cleanliness and represents a relevant way to fabricate functionalized devices for micro-nanoelectronics, optoelectronics, photovoltaic, spintronic, plasmonic, etc… This UHV connection combining FIB nanostructuration and epitaxy growth technique provides a unique platform to elaborate tridimensional structures with milling/deposition steps. Among different applications, we decided to focus on silicon based nanostructures. Regarding silicon nanostructures. The main challenge for microelectronics industry and for the researchers in this field is the realization of optoelectronics devices fully integrated in silicon systems. This requires to convert silicon based materials into absorber/emitter of light. One of the most promising way to change the electronic structure and to get a direct bandgap is the combination of chemical functionalization and quantum confinement into silicon based nano-objects

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Claude, Jean-Benoît. "Etude des mécanismes de nanogravure par FIB-LMAIS". Electronic Thesis or Diss., Aix-Marseille, 2017. http://www.theses.fr/2017AIXM0445.

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Guellil, Imene. "Nano-fonctionnalisation par FIB haute résolution de silicium". Electronic Thesis or Diss., Aix-Marseille, 2022. http://www.theses.fr/2022AIXM0361.

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Le but de ce travail est de développer un processus d’élaboration de boîtes quantiques (QD) de silicium-germanium (SiGe) avec des compositions allant du Si au Ge pur, et permettant d’obtenir des QD semi-conductrices et de tailles suffisamment petites pour l’obtention de confinement quantique. Pour cela, nous avons utilisé une combinaison de différentes techniques : l’épitaxie par jets moléculaires, la lithographie ionique par faisceau d’ions focalisés (FIBL) et le démouillage solide hétérogène. Dans ce contexte, la finalité de cette recherche est d’une part de développer un FIB qui puisse être couplé à un bâti d’épitaxie par jets moléculaires sous ultra-vide et d’autre part de valider le FIB avec deux applications : des nanogravures pour l’auto-organisation des QD et des nano-implantations de Si et de Ge pour la création de défauts locaux émetteurs de lumière. Nous avons utilisé la FIBL avec des sources d’ions d’alliage métallique liquide (LMAIS) filtrées en énergie utilisant des ions non polluants (Si et Ge) dans des substrats issus de la microélectronique tels que des substrats de SiGe sur silicium-sur-isolant (SGOI). Les nano-gravures doivent être totalement dénuées de pollution et aux caractéristiques variables et parfaitement contrôlées (taille, densité, profondeur). La morphologie des nano-gravures obtenues est ensuite caractérisée in-situ par microscopie électronique à balayage (SEM), et la profondeur est déterminée par des caractérisations ex-situ par microscopie de force atomique (AFM). Les nano-gravures réalisées par FIBL ont été comparées d’une part aux gravures plasmas avec He et Ne et d’autre part aux gravures obtenues par lithographie électronique (EBL)
The goal of this work is to develop a process for the elaboration of silicon-germanium (SiGe) quantum dots (QDs) with compositions ranging from Si to pure Ge, and allowing to obtain semiconducting QDs with sufficiently small sizes to obtain quantum confinement. For this purpose, we have used a combination of different techniques: molecular beam epitaxy, focused ion beam lithography (FIBL) and heterogeneous solid state dewetting. In this context, the aim of this research is on the one hand to develop a new FIB that can be coupled to the ultra-high vacuum molecular beam epitaxy growth chamber, and on the other hand to realize two applications: (i) nanopatterns for the self-organisation of Si and Ge QDs and (ii) nano-implantations of Si and Ge. We used FIBL with energy-filtered liquid metal alloy ion sources (LMAIS) using non-polluting ions (Si and Ge) for the milling of conventional microelectronic substrates such as SiGe on silicon-on-insulator (SGOI). The nanopatterns must be totally free of pollution and with variable and perfectly controlled characteristics (size, density, depth). The morphology of the nanopatterns is then characterized in-situ by scanning electron microscopy (SEM), and the depth is determined ex-situ by atomic force microscopy (AFM). The nanopatterns made by FIBL were compared on the one hand to plasma etchings with He and Ne and on the other hand to the etchings obtained by electronic lithography (EBL). Nanoimplantations of Si and Ge ions were realised in diamond and in ultra-thin SGOI for the fabrication of local defects

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Calvo, Antonio M. "MARC to XML : an enhanced name authority record /". Examples, 2000. http://senna.sjsu.edu/lmain/Nomen/.

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SALES, DECILIO DE MEDEIROS. "CONTROL PROBLEM SOLUTIONS BY FREQUENCY DEPENDENT BMIS AND LMIS". PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2000. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=8385@1.

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CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO
Nesta tese, é apresentado e analisado em termos da propriedade de convergência global um novo algoritmo para problemas de otimização quadrática sujeitos ou a restrições de desigualdades matriciais bilineares (BMIs) ou a restrições de desigualdades matriciais lineares (LMIs) dependentes da freqüência, estes problemas são muito relevantes para a teoria de controle porque uma ampla classe de controladores (por exemplo, controladores H2/Hinf de ordem fixa, síntese de controladores descentralizados, análise do desempenho robusto H2 ou Hinf, etc.) pode ser computada a partir da solução de problemas de otimização desta natureza. Infelizmente, estes problemas são reconhecidamente de difícil solução, pois envolvem, entre outras coisas, não convexidade (restrição BMI), não diferenciabilidade da restrição, etc. em função dessa complexibilidade, algumas alternativas para a obtenção de soluções aproximadas têm sido adotada na literatura especializada recente (Safonov, 1994; Paganini, 1996). O algoritmo proposto neste trabalho de tese é uma alternativa para as abordagens atuais com vantagens no sentido de permitir a obtenção de melhores aproximações assim como a possibilidade de explorar a estrutura particular de cada problema de interesse e, com isso, viabilizar do ponto de vista computacional o projeto de controladores envolvendo plantas de ordem mais elevada. Este algoritmo pode ser visto como a generalização de um algoritmo anterior com boas propriedades proposto por Corrêa & Sales (1998) para problemas quadráticos sujeitos a restrições envolvendo LMIs canônicas. De forma bastante genética, a solução do problema original (um problema envolvendo um número infinito de restrições é substituído por uma única) onde, em cada passo do algoritmo, a restrição é interativamente modificada. Demonstrar-se-á que para problemas quadráticos envolvendo restrições BMIs (problemas não convexos) a seqüência de soluções geradas pelo algoritmo convergirá para a solução ótima global do problema original. Por outro lado, no caso dos problemas quadráticos envolvendo restrições LMIs dependentes da freqüência, a seqüência gerada de custos auxiliares é monótona crescente e, adicionalmente, se a seqüência de matrizes de ponderação for limitada superiormente (uma condição suficiente), demonstrar-se-á que a seqüência de soluções geradas pelo algoritmo convergirá para a solução ótima global do problema original. Finalmente, são apresentadas algumas aplicações a problemas de controle acompanhadas de alguns exemplos numéricos ilustrativos.
In this thesis, it is proposed and analysed in terms of the global-convergence property a new algorithm for solving quadratic optimisation problems under either a BMI (bilinear matrix inequality) or a frequency-dependent LMI (linear matrix inequality) constraints. These problems are of special interest in the control literature a some very important control problems such as the H2/H(infinite) fixed-order controller, multiobjectives, H2 and H (infinite) robust performance analysis among others problems can be posed as problems of this kind for which does not still exist yet a reliable global convergent algorithm. Nowadays, approximate solutions to those problems are based upon grid and interpolation techniques as suggested by Paganini (1996) in the case of frequency- wise LMI constraints or branch and bound algorithms or branch and bound algorithms mainly and alternating LMIs as far as BMIs constraints are involved (Safonov, 1994). All of those approaches suffer, of course, from obvious numerical difficulties. In fact, those approaches were introduced as preliminary attempts in solving the problems just mentioned. The algorithm to presented here, which can be seen as a generalisation of an earlier algorithm proposed by Corrêa e Sales (1998) for solving standard feasibility LMIs problems, is a step forward in an attempt of handling difficulties not faced properly by those methodologies. In a broaden sense, the proposed algorithm solves the original problem (a problem subject to an infinite number of constraints is replaced by a single one properly chosen. It is worth noting that this basic idea was introduced by Lawson (1961) in a rather different context, namely, the problem of computing Tchebycheff approximations by means of sequences of weighted quadratic problems. It is pointed out here that in the case of quadratic problems under a BMI constraint (a nonconvex problem); it is proved that the sequence of auxiliary solutions generated by the algorithm converges to the global optimal solution of the original one. On the other hand, as for quadratic problems under a frequency-dependent LMI constraint (an infinite-dimensional problem) it is proved that the auxiliary cost-sequence values increases asymptotically and, If the weight updating sequence is bounded from above (a sufficient condition), the sequence of auxiliary solutions will converge to the optimal solution of the original problem as well. Finally, some applications to control problem are presented accompanied by some numerical examples.

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Tognetti, Eduardo Stockler. "Controle de sistemas nebulosos Takagi-Sugeno usando relaxações LMIs". [s.n.], 2011. http://repositorio.unicamp.br/jspui/handle/REPOSIP/261060.

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Orientador: Pedro Luis Dias Peres, Ricardo Coração de Leão Fontoura de Oliveira
Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de Computação
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Resumo: A principal contribuição dessa tese é a proposta de novas condições, em termos de desigualdades matriciais lineares, para a análise de estabilidade e síntese de controladores de sistemas nebulosos Takagi-Sugeno, casos discretos e contínuos no tempo. A lei de controle considerada é por realimentação de estados, sendo que para sistemas contínuos no tempo são também projetados controladores de realimentação de saída estática e dinâmica, de ordem arbitrária. São adotados como critérios de desempenho os custos garantidos H2 e H?. As funções de Lyapunov propostas, mais gerais que as existentes na literatura, são construídas como a combinação nebulosa de funções quadráticas nos estados, polinomiais homogêneas de grau arbitrário em termos das funções de pertinência do sistema nebuloso. As funções de pertinência são modeladas em um espaço definido pelo produto Cartesiano de simplexos no mesmo instante de tempo, no caso contínuo, ou em múltiplos instantes de tempo, permitindo o projeto de controladores com memória finita de parâmetros presentes e passados, no caso discreto. Em sistemas contínuos, as variáveis premissas usadas na lei de controle podem ser escolhidas pelo projetista, de acordo com a disponibilidade ou não para implementação em tempo real, dando um caráter seletivo ao controlador. Nas condições de síntese de controladores, duas situações distintas para as taxas de variação das funções de pertinência são consideradas. Um conjunto convexo modela o espaço ao qual pertencem as derivadas temporais das funções de pertinência, no caso em que algumas taxas máximas de variação são conhecidas. Para taxas de variações arbitrárias, quando as variáveis premissas são os estados, utilizam-se funções de Lyapunov do tipo integral de linha associadas a uma estratégia de síntese em dois estágios. No primeiro estágio um ganho de realimentação de estados é projetado e utilizado como entrada no segundo estágio, que retorna, se possível, um controlador de realimentação de estados que atende especificações de desempenho mais exigentes, ou ganhos de realimentação estática ou dinâmica de saída, de ordem completa ou reduzida. Exemplos numéricos ilustram os resultados, mostrando que os métodos propostos podem reduzir o conservadorismo nos problemas estudados, sendo mais eficientes quando comparados com outras abordagens da literatura
Abstract: This thesis proposes, as main contribution, new linear matrix inequalities conditions for stability analysis and control synthesis of continuous and discrete-time Takagi-Sugeno fuzzy systems. A state feedback control law is considered and, for continuous-time systems, static and dynamic output feedback controllers of arbitrary order are also determined. The H2 and H? guaranteed costs are adopted as performance criteria. The proposed Lyapunov functions, more general than the others in the literature, are constructed as fuzzy combinations of quadratic in the state functions that are homogeneous polynomials of arbitrary degree depending on the membership functions of the fuzzy systems. The membership functions are modeled in a space defined by the Cartesian product of simplexes in the same instant of time, in the continuous-time case, or in multiple instants of time, yielding finite memory controllers depending on the present and past parameters, in the discrete-time case. In the continuous-time synthesis conditions, the premise variables used in the control law can be defined by the designer, accordingly to real-time availability, as a selective feature of the controller. Two different situations are considered in terms of the rates of variation of the membership functions. A convex set models the space of the timederivatives of the membership functions if some upper bounds of the variation rates are known. For arbitrary rates, when the premise variables are the states of the system, a line-integral Lyapunov function is considered associated with a two steps procedure. At the first step, a state feedback is computed and used as an input for the second step, that provides, if possible, a state feedback controller that take into account more stringent performance specifications, or static or dynamic controllers, of full and reduced orders. Numerical examples illustrate the results, showing that the proposed approaches can be less conservative and more efficient when compared with other methods available in the literature
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Tello, Ivan Francisco Yupanqui [UNESP]. "Projeto de controle robusto para sistemas chaveados via LMIs". Universidade Estadual Paulista (UNESP), 2017. http://hdl.handle.net/11449/151004.

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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Neste trabalho são apresentados uma série de resultados relacionados com as técnicas de controle para sistemas lineares chaveados incertos que asseguram índices de desempenho e custos garantidos no projeto. Inicialmente a técnica abordada para este estudo consiste na utilização das desigualdades de Lyapunov-Metzler e as propriedades dos sistemas Estritamente Reais Positivos (ERP). São abordados os sistemas Lyapunov-Metzler-ERP (LMERP), que permitem o desenvolvimento de um método de projeto de estabilização para sistemas que apresentam comutação e incertezas no modelo, usando para isto a realimentação do vetor de estado. A análise de estabilidade é descrita por meio de Desigualdades Matriciais Lineares (em inglês: Linear Matrix Inequalities), LMIs, que, quando factíveis, são facilmente resolvidas por meio de ferramentas disponíveis de programação convexa. Neste trabalho trata-se também da síntese via realimentação de estado com chaveamento no ganho que assegura o critério de desempenho Hoo. Para a validação das estratégias de controle mencionadas foram realizadas simulações e experimentos práticos em um sistema de suspensão ativa de bancada e em um sistema ball balancer, equipamentos fabricados pela Quanser. Os resultados comprovam a eficácia dos método propostos tanto nas simulações quanto nos testes realizados em bancada.
This work presents a series of results related to the control techniques for uncertain switched linear systems that ensure performance indicators and guaranteed cost in the design. Initially the technique discussed in this study is the use of Lyapunov-Metzler Inequalities and properties of Strictly Positive Real Systems (SPR), so the Lyapunov-Metzler-SPR systems (LMSRP) are revised, which allow the development of a method of stabilization for systems that have switching and uncertainties in the model, using for this the state feedback. The stability analysis is described by Linear Matrix Inequalities, LMIs, that when are feasible, these are easily solved through tools available in convex programming literature. We also deal with the synthesis via state feedback with switching in the gain that ensures the performance criterion Hoo. In order to validate the proposed strategy simulations and experiments were performed on a bench active suspension system and a ball balancer system, equipments manufactured by Quanser. The results prove the effectiveness of the proposed method both in simulations and in bench tests.

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Tello, Ivan Francisco Yupanqui. "Projeto de controle robusto para sistemas chaveados via LMIs /". Ilha Solteira, 2017. http://hdl.handle.net/11449/151004.

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Orientador: Rodrigo Cardim
Resumo: Neste trabalho são apresentados uma série de resultados relacionados com as técnicas de controle para sistemas lineares chaveados incertos que asseguram índices de desempenho e custos garantidos no projeto. Inicialmente a técnica abordada para este estudo consiste na utilização das desigualdades de Lyapunov-Metzler e as propriedades dos sistemas Estritamente Reais Positivos (ERP). São abordados os sistemas Lyapunov-Metzler-ERP (LMERP), que permitem o desenvolvimento de um método de projeto de estabilização para sistemas que apresentam comutação e incertezas no modelo, usando para isto a realimentação do vetor de estado. A análise de estabilidade é descrita por meio de Desigualdades Matriciais Lineares (em inglês: Linear Matrix Inequalities), LMIs, que, quando factíveis, são facilmente resolvidas por meio de ferramentas disponíveis de programação convexa. Neste trabalho trata-se também da síntese via realimentação de estado com chaveamento no ganho que assegura o critério de desempenho Hoo. Para a validação das estratégias de controle mencionadas foram realizadas simulações e experimentos práticos em um sistema de suspensão ativa de bancada e em um sistema ball balancer, equipamentos fabricados pela Quanser. Os resultados comprovam a eficácia dos método propostos tanto nas simulações quanto nos testes realizados em bancada.
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Andrea, Cristiano Quevedo [UNESP]. "Modificação de zeros em sistemas de controle robusto utilizando LMIs". Universidade Estadual Paulista (UNESP), 2007. http://hdl.handle.net/11449/100360.

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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Neste trabalho são propostas metodologias para a utilização dos zeros em sistemas de controle. Neste contexto, propõe-se o uso dos zeros no projeto de sistemas de rastreamento de sinais de referência e apresenta-se um processo sistemático para alocação de zeros aplicado a sistemas de controle. Objetivando-se solucionar o problema de rastreamento de sinais de referência propõe-se uma metodologia de variação dos zeros, sendo considerado a existência de um sinal de entrada exógena de perturbação ou distúrbio na planta. Neste contexto, em um primeiro momento, projeta-se um controlador a fim de diminuir o efeito desta perturbação no desempenho do sistema. O processo de atenuação do efeito do sinal exógeno na saída do sistema é abordado de duas maneiras: com a realimentação dos estados reconstruídos da planta através do estimador, neste caso utiliza-se um controlador H2 e utilizando-se a realimentação dinâmica da saída do sistema através de um controlador K(s) com índice de desempenho H 2 ou H8. A seguir, através da modificação dos zeros, minimiza a norma H8 entre o sinal de referência e o erro entre o sinal de saída e a referência, constituindo portanto um rastreador de sinal. Os projetos são equacionados utilizando-se inequações matriciais lineares, que...
Methodologies that use zeros in control systems were proposed. In this context, were proposed the use of zero for tracking system and a systematic process for zeros location used in control system. A methodology were proposed to vary the zeros, that is useful to solve the tracking problem, when the existence of input perturbation or disturbance signal is considered in the plant. Initially, a controller is designed in order to attenuate the effect of disturbance signal. The attenuation of the effect of the signal disturbance is made in two ways. In the first moment, is used the feedback of states of the plant thought of the estimator, and in this case is designed a H2 controller. In the other hand, is used the dynamic output feedback, and so it is designed a H2 or H8 controller for obtain this attenuation. Following, it is minimized the H8-norm between the reference signal and error signal, where the error signal is the difference between the output signal and the reference signal, it becoming a system tracking. The designs was formulated in terms of linear matrix inequalities, that allow describe the problems of convex optimization. A methodology for to obtain the global optimum solution using zeros variation is presented. The methodology of zeros used to solve... (Complete abstract, click electronic access below)

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Andrea, Cristiano Quevedo. "Modificação de zeros em sistemas de controle robusto utilizando LMIs /". Ilha Solteira : [s.n.], 2007. http://hdl.handle.net/11449/100360.

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Orientador: Edvaldo Assunção
Banca: Marcelo Carvalho Minhoto Teixeira
Banca: José Paulo Fernandes Garcia
Banca: Karl Heinz Kienitz
Banca: Paulo Augusto Valente Ferreira
Resumo: Neste trabalho são propostas metodologias para a utilização dos zeros em sistemas de controle. Neste contexto, propõe-se o uso dos zeros no projeto de sistemas de rastreamento de sinais de referência e apresenta-se um processo sistemático para alocação de zeros aplicado a sistemas de controle. Objetivando-se solucionar o problema de rastreamento de sinais de referência propõe-se uma metodologia de variação dos zeros, sendo considerado a existência de um sinal de entrada exógena de perturbação ou distúrbio na planta. Neste contexto, em um primeiro momento, projeta-se um controlador a fim de diminuir o efeito desta perturbação no desempenho do sistema. O processo de atenuação do efeito do sinal exógeno na saída do sistema é abordado de duas maneiras: com a realimentação dos estados reconstruídos da planta através do estimador, neste caso utiliza-se um controlador H2 e utilizando-se a realimentação dinâmica da saída do sistema através de um controlador K(s) com índice de desempenho H 2 ou H8. A seguir, através da modificação dos zeros, minimiza a norma H8 entre o sinal de referência e o erro entre o sinal de saída e a referência, constituindo portanto um rastreador de sinal. Os projetos são equacionados utilizando-se inequações matriciais lineares, que... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: Methodologies that use zeros in control systems were proposed. In this context, were proposed the use of zero for tracking system and a systematic process for zeros location used in control system. A methodology were proposed to vary the zeros, that is useful to solve the tracking problem, when the existence of input perturbation or disturbance signal is considered in the plant. Initially, a controller is designed in order to attenuate the effect of disturbance signal. The attenuation of the effect of the signal disturbance is made in two ways. In the first moment, is used the feedback of states of the plant thought of the estimator, and in this case is designed a H2 controller. In the other hand, is used the dynamic output feedback, and so it is designed a H2 or H8 controller for obtain this attenuation. Following, it is minimized the H8-norm between the reference signal and error signal, where the error signal is the difference between the output signal and the reference signal, it becoming a system tracking. The designs was formulated in terms of linear matrix inequalities, that allow describe the problems of convex optimization. A methodology for to obtain the global optimum solution using zeros variation is presented. The methodology of zeros used to solve... (Complete abstract, click electronic access below)
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Libros sobre el tema "Lmais"

Duan, Guang-Ren y Hai-Hua Yu. LMIs in Control Systems. CRC Press, 2013. http://dx.doi.org/10.1201/b15060.

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LMIs in Control Systems Analysis and Design. Taylor & Francis Inc, 2013.

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Duan, Guang-Ren y Hai-Hua Yu. LMIs in Control Systems: Analysis, Design and Applications. Taylor & Francis Group, 2013.

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Duan, Guang-Ren y Hai-Hua Yu. LMIs in Control Systems: Analysis, Design and Applications. Taylor & Francis Group, 2013.

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Duan, Guang-Ren y Hai-Hua Yu. LMIs in Control Systems: Analysis, Design and Applications. Taylor & Francis Group, 2013.

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Duan, Guang-Ren y Hai-Hua Yu. LMIs in Control Systems: Analysis, Design and Applications. Taylor & Francis Group, 2013.

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Pagè, Fréric, Dominique Maison y Michael Faulde. Current control strategies for infectious diseases in low-income countries. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198789833.003.0002.

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The burden of communicable diseases is ten times higher in low- and middle-income countries (LMICs) in terms of mortality rate and of years of life lost. Most of the LMCIs are in tropical or subtropical areas with vector-favorable climate conditions and poverty impeding access to improved water supply, sanitation, and efficient health care coverage. Public health strategies to control infectious diseases can be sorted by prevention level. Infectious diseases control strategies often combine actions from different prevention levels according to the stage of a disease. At the individual level, actions and interventions are succeeding in a logical cascade following the stage of the disease as community-level actions are implemented. We present strategies that have been implemented to control infectious diseases, their limits and the needs to attain successful control of infectious diseases in LMICs.

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Capítulos de libros sobre el tema "Lmais"

Skelton, Robert E. "LMIs in Control Optimization". En Active and Passive Vibration Control of Structures, 249–57. Vienna: Springer Vienna, 2014. http://dx.doi.org/10.1007/978-3-7091-1821-4_5.

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Orloff, Jon, Mark Utlaut y Lynwood Swanson. "Ion Optics for LMIS". En High Resolution Focused Ion Beams: FIB and its Applications, 79–121. Boston, MA: Springer US, 2003. http://dx.doi.org/10.1007/978-1-4615-0765-9_4.

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Eisermann, Jessica. "Staatsregulation: Die Landesmedienanstalten (LMAs)". En Mediengewalt, 149–205. Wiesbaden: VS Verlag für Sozialwissenschaften, 2001. http://dx.doi.org/10.1007/978-3-322-89166-2_6.

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Sampankanpanich Soria, Claire, Daniel E. Lee y Gerard R. Manecke. "Laryngeal Mask Airways (LMAs)". En Anesthesiology Resident Manual of Procedures, 95–99. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-65732-1_19.

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Kluge-Wilkes, Aline, Ralph Baier, Ike Kunze, Aleksandra Müller, Amir Shahidi, Dominik Wolfschläger, Christian Brecher et al. "Modular Control and Services to Operate Lineless Mobile Assembly Systems". En Internet of Production, 1–26. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-030-98062-7_13-2.

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AbstractThe increasing product variability and lack of skilled workers demand for autonomous, flexible production. Since assembly is considered a main cost driver and accounts for a major part of production time, research focuses on new technologies in assembly. The paradigm of Line-less Mobile Assembly Systems (LMAS) provides a solution for the future of assembly by mobilizing all resources. Thus, dynamic product routes through spatiotemporally configured assembly stations on a shop floor free of fixed obstacles are enabled. In this chapter, we present research focal points on different levels of LMAS, starting with the macroscopic level of formation planning, followed by the mesoscopic level of mobile robot control and multipurpose input devices and the microscopic level of services, such as interpreting autonomous decisions and in-network computing. We provide cross-level data and knowledge transfer through a novel ontology-based knowledge management. Overall, our work contributes to future safe and predictable human-robot collaboration in dynamic LMAS stations based on accurate online formation and motion planning of mobile robots, novel human-machine interfaces and networking technologies, as well as trustworthy AI-based decisions.

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Kluge-Wilkes, Aline, Ralph Baier, Ike Kunze, Aleksandra Müller, Amir Shahidi, Dominik Wolfschläger, Christian Brecher et al. "Modular Control and Services to Operate Lineless Mobile Assembly Systems". En Internet of Production, 303–28. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-44497-5_13.

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Wams, Bart, Miguel Ayala Botto, Ton van den Boom y José Sá da Costa. "LMIs for robust stable neural model-based control". En Stability and Stabilization of Nonlinear Systems, 375–87. London: Springer London, 1999. http://dx.doi.org/10.1007/1-84628-577-1_19.

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Kluge-Wilkes, Aline, Balaji Gunaseelan y Robert H. Schmitt. "Ontology-Based Task Allocation for Heterogeneous Resources in Line-Less Mobile Assembly Systems". En Annals of Scientific Society for Assembly, Handling and Industrial Robotics 2022, 53–63. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-10071-0_5.

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AbstractVolatile markets and production request for assembly systems adaptable to changes of product types, production capacity, and product order. Computer-aided decision support systems facilitate scheduling, planning, and controlling adaptive and flexible assembly systems. Formal description models of resources and their capabilities, assembly tasks and their requirements are necessary for automated decision-making. This paper contributes a conceptual CAPabILity-based resource AllocatioN Ontology (CAPILANO). The ontology is tailored as a uniform description of heterogeneous assembly resources and their (combined) capabilities, connected to a capability-based task allocation approach. The intended application of the resulting framework is the identification of suitable assembly resources in Line-less Mobile Assembly Systems (LMAS) and their allocation to assembly tasks, based on a unified and formal description. To date, ontologies in assembly have been limited to querying resources and their capabilities; here, subsequent task allocation is presented as an integral component of a tailored framework. The resulting framework consists of a model of heterogeneous resources and their capabilities in an ontology created in Protégé in OWL, SPARQL-based querying, and a consecutive and availability-aware task allocation in Python. The development of the ontology-based task allocation framework, including ontology taxonomy, querying and task allocation, is discussed. Its applicability in LMAS is demonstrated through linear scalability of task allocation and future advances are discussed.

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Kluge-Wilkes, Aline y Robert H. Schmitt. "Dynamic Task Allocation for Cooperating, Heterogeneous Assembly Resources in LMAS". En Towards Sustainable Customization: Bridging Smart Products and Manufacturing Systems, 535–42. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-90700-6_60.

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Actas de conferencias sobre el tema "Lmais"

Eldem, Vasfi y Kadri Ozcaldiran. "A reduction algorithm for LMIs". En European Control Conference 2007 (ECC). IEEE, 2007. http://dx.doi.org/10.23919/ecc.2007.7068659.

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Roy, Chandan K., Daniel K. Harris, Sushil Bhavnani, Michael C. Hamilton, Wayne Johnson y Roy W. Knight. "Durability of Low Melt Alloys as Thermal Interface Materials". En ASME 2015 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems collocated with the ASME 2015 13th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/ipack2015-48083.

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This paper focuses on developing a reliable thermal interface material (TIM) using low melt alloys (LMAs) containing gallium (Ga), indium (In), bismuth (Bi), and tin (Sn). The investigation described herein involved the in situ thermal performance of the LMAs as well as performance evaluation after accelerated life cycle testing, which included isothermal aging at 130°C and thermal cycling from −40°C to 80°C. Three alloys (75.5Ga &24.5In, 100Ga, and 51In, 32.5Bi &16.5Sn) were chosen for testing the thermal performance. Testing methodologies used follow ASTM D5470 protocols and the results are compared with some commercially available TIMs. The LMAs-substrate interaction was investigated by applying the alloys using different surface treatments (copper and tungsten). Measurements show that the alloys did survive extended aging and cycling depending upon the substrate-alloy combinations.

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Ma, Xianfeng, Gen Li, Xuelin Zheng, Xiaozhong Wang, Zhongcheng Wang y Yulong Ji. "Thermal Property Enhancement of Liquid Metal Used As Thermal Interface Material by Mixing Magnetic Particles". En ASME 2019 6th International Conference on Micro/Nanoscale Heat and Mass Transfer. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/mnhmt2019-4155.

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Abstract The usage of low melting temperature alloys (LMAs) as thermal interface materials (TIMs) has attracted more and more attention for their high thermal conductivity. However, the wettability between liquid metal and ordinary metal surface was poor, which results in high thermal interface resistance. The thermal and physical properties of LMAs can be modified by adding nano or micro particles. In this study, the room temperature liquid metal (gallium, indium and tin eutectic) was used as TIM and its properties were modified by mixing magnetic nickel particles. Further, the effects of magnetic field application on the thermal performance of modified LMAs were evaluated by steady state method with specially designed sample holder. Results showed that the thermal conductivity of liquid metal mixed with nickel particle increased from 27.33 W/(m · K) to 33.33 W/(m · K) with the application of magnetic field.

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Tanaka, K., T. Ikeda y H. O. Wang. "Fuzzy control system design via LMIs". En Proceedings of 16th American CONTROL Conference. IEEE, 1997. http://dx.doi.org/10.1109/acc.1997.611982.

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Tesch, Paul, Noel Smith, Noel Martin y Doug Kinion. "High Current Focused Ion Beam Instrument for Destructive Physical Analysis Applications". En ISTFA 2008. ASM International, 2008. http://dx.doi.org/10.31399/asm.cp.istfa2008p0007.

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Abstract Conventional focused ion beams (FIB) employing liquid metal ion sources (LMIS) are used to create site specific cross-sections for viewing subsurface features and performing 3D metrology on subsurface structure. Emerging applications incorporate novel materials as well as large structures that interface to decreasing IC dimensions and often require destructive physical analysis. This paper describes a novel instrument in which an inductively coupled plasma ion source is integrated onto a conventional FIB column. It compares this instrument to the existing LMIS FIBs and shows examples that illustrate the capabilities of this tool. This instrument retains the benefits of the conventional LMIS FIB such as high placement accuracy and the ability to immediately obtain high resolution images of the cross-section face without having to transfer it to another tool. It is capable of creating large cross-sections from 10 microns to 1mm in size at about 100 times faster than a conventional FIB.

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Zhang, XueFeng y Yingbo Zhang. "Improvement of Admissibility of Linear Singular Fractional Order Systems". En ASME 2019 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/detc2019-98329.

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Abstract This paper considers the least solutions of linear matrix inequalities (LMIs) in criteria of admissibility for continuous singular fractional order systems (FOS). The new criteria are given which are strict LMIs and do not involve equality constraint and with the less LMI decision variables. With brief and simple results of this paper, the numbers of solved matrices are reduced from a pair of matrices to just a matrix in which we can analyze singular fractional order systems with completely consistent format as normal systems.

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White, Andrew, Guoming Zhu y Jongeun Choi. "A Linear Matrix Inequality Solution to the Input Covariance Constraint Control Problem". En ASME 2013 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/dscc2013-3716.

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In this paper, the input covariance constraint (ICC) control problem is solved by a convex optimization with linear matrix inequality (LMI) constraints. The ICC control problem is an optimal control problem that is concerned with finding the best output performance possible subject to multiple constraints on the input covariance matrices. The contribution of this paper is the characterization of the control synthesis LMIs used to solve the ICC control problem. To demonstrate the effectiveness of the proposed approach a numerical example is solved with the control synthesis LMIs. Both discrete and continuous-time problems are considered.

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Yaz, E. E., Chun Seop Jeong y M. Alotaibi. "Resilient design of Thau's observer using LMIs". En Proceedings of the 2004 American Control Conference. IEEE, 2004. http://dx.doi.org/10.23919/acc.2004.1384450.

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Fridman, Emilia y Leonid Shaikhet. "Simple LMIs for stabilization by using delays". En 2016 IEEE 55th Conference on Decision and Control (CDC). IEEE, 2016. http://dx.doi.org/10.1109/cdc.2016.7798756.

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Wagner, Daniel, Didier Henrion y Martin Hromcik. "Measures and LMIs for Adaptive Control Validation". En 2019 IEEE 58th Conference on Decision and Control (CDC). IEEE, 2019. http://dx.doi.org/10.1109/cdc40024.2019.9029254.

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Informes sobre el tema "Lmais"

Burbridge, T., P. Eardley, M. Bagnulo y J. Schoenwaelder. Information Model for Large-Scale Measurement Platforms (LMAPs). RFC Editor, agosto de 2017. http://dx.doi.org/10.17487/rfc8193.

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Barlow, Jay. SWFSC Marine Mammal Abundance Data for Input into LMRIS. Fort Belvoir, VA: Defense Technical Information Center, febrero de 2002. http://dx.doi.org/10.21236/ada399279.

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Johnson, Eric M., Robert Urquhart y Maggie O'Neil. The Importance of Geospatial Data to Labor Market Information. RTI Press, junio de 2018. http://dx.doi.org/10.3768/rtipress.2018.pb.0017.1806.

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School-to-work transition data are an important component of labor market information systems (LMIS). Policy makers, researchers, and education providers benefit from knowing how long it takes work-seekers to find employment, how and where they search for employment, the quality of employment obtained, and how steady it is over time. In less-developed countries, these data are poorly collected, or not collected at all, a situation the International Labour Organization and other donors have attempted to change. However, LMIS reform efforts typically miss a critical part of the picture—the geospatial aspects of these transitions. Few LMIS systems fully consider or integrate geospatial school-to-work transition information, ignoring data critical to understanding and supporting successful and sustainable employment: employer locations; transportation infrastructure; commute time, distance, and cost; location of employment services; and other geographic barriers to employment. We provide recently collected geospatial school-to-work transition data from South Africa and Kenya to demonstrate the importance of these data and their implications for labor market and urban development policy.

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