650 research outputs found
Differentiator for Noisy Sampled Signals with Best Worst-Case Accuracy
No full textThis letter proposes a differentiator for sampled signals with bounded noise and bounded second derivative. It is based on a linear program derived from the available sample information and requires no further tuning beyond the noise and derivative bounds. A tight bound on the worst-case accuracy, i.e., the worst-case differentiation error, is derived, which is the best among all causal differentiators and is moreover shown to be obtained after a fixed number of sampling steps. Comparisons with the accuracy of existing high-gain and sliding-mode differentiators illustrate the obtained results.Fil: Haimovich, Hernan. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Rosario. Centro Internacional Franco Argentino de Ciencias de la Información y de Sistemas. Universidad Nacional de Rosario. Centro Internacional Franco Argentino de Ciencias de la Información y de Sistemas; ArgentinaFil: Seeber, Richard. Technische Universitat Graz; AustriaFil: Aldana Lopez, Rodrigo. Universidad de Zaragoza; EspañaFil: Gomez Gutierrez, David. Mexico School of Engineering and Science; Méxic
Designing Controllers with Predefined Convergence-Time Bound Using Bounded Time-Varying Gains
No full textRecently, there has been a great deal of attention in a class of controllers based on time-varying gains, called prescribed-time controllers, that steer the system’s state to the origin in the desired time, a priori set by the user, regardless of the initial condition. Furthermore, such a class of controllers has been shown to maintain a prescribed-time convergence in the presence of disturbances even if the disturbance bound is unknown. However, such properties require a time-varying gain that becomes singular at the terminal time, which limits its application to scenarios under quantization or measurement noise. This chapter presents a methodology to design a broader class of controllers, called predefined-time controllers, with a prescribed convergence-time bound. Our approach allows designing robust predefined-time controllers based on time-varying gains while maintaining uniformly bounded time-varying gains. We analyze the condition for uniform Lyapunov stability under the proposed time-varying controllers.Fil: Aldana Lopez, Rodrigo. Universidad de Zaragoza; EspañaFil: Seeber, Richard. Graz University Of Technology.; AustriaFil: Haimovich, Hernan. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Rosario. Centro Internacional Franco Argentino de Ciencias de la Información y de Sistemas. Universidad Nacional de Rosario. Centro Internacional Franco Argentino de Ciencias de la Información y de Sistemas; ArgentinaFil: Gomez Gutierrez, David. Intel Corporation; México. Instituto Tecnológico José Mario Molina Pasquel y Henríquez; Méxic
Monitoring and interpreting multistage and multicategory processes:
No full textConsider processes where a transaction moves through stages and falls within a category at each stage. For example, in a tax complaint process, the stages are the steps taxpayers follow to resolve a property tax dispute from initial complaint through final resolution. The primary motivation here is customer service, although the transactions could be related to manufacturing applications as well.
The main contribution here is a method to monitor the fractions and numbers of transactions within and across stages of multistage and multicategory processes, a problem that has not been formulated before in the literature. The proposed method not only signals an out-of-control situation, it identifies accurately and easily which stages and categories are causing the disturbance, providing interpretations within and across stages of the process.
The proposed methodology works as follows: If a multinomial distribution fits the number of transactions in each category at every stage, then the process is decomposed into single stages that are monitored separately, and finally into independent binary substages with two categories. Each binary substage is characterized by a conditional probability and monitored with an independent fraction, called a tree fraction. The number of tree fractions that are monitored depends on the number of final categories, i.e., those that do not split in any further categories, not on the number of stages.
Two other contributions, summarized next, address the single stage case. Each is useful by itself, and each contributes to the method for the multistage case as well.
The first is a new two-sided CUSUM Arcsine method to monitor a process with two categories. The second is the p-tree method that monitors a multinomial process. The p-tree method not only signals an out-of-control situation, it identifies accurately which categories are causing the problem, in contrast to the widely used method in Marcucci (1985).
Future research would cover monitoring other types of multistage processes in service. An application of using probability trees to test and interpret associations in contingency tables is envisioned.Ph.D.Includes bibliographical references (p. 114-120)by Rodrigo Ignacio Duran Lope
El asteroide "2012 AE1” no es un nuevo asteroide sino, en realidad el “2007 HX3
No full textNoticia del "SPANISH VIRTUAL OBSERVATORY" – Agosto 4 del 2012
El 2012 AE1 es un asteroide de tipo Apolo descubierto el 1 de enero de 2012. Gracias al programa de identificación de asteroides cercanos a la Tierra fue posible descubrir que dicho asteroide ya aparecía en las imágenes SDSS del 31 de marzo de 2003. Las medidas fueron realizadas por los siguientes colaboradores:
F. Arias Arias,
E. Arredondo Pi, V. Bibe, F. Cabello, J. C. Cabrera Garcia,
C. De Diego Garcia, J. M. De La Osa Lopez, A. Del Castillo,
A. Deza Portero, M. Fernandez Hergueta, M. A. Fernandez Muros,
E. Galvez Ranera, F. Garcia De La Cuesta, E. Garcia Del Moral,
F. Garcia Marin, A. Garijo Martinez, C. A. Garrido Lopez,
C. Godina Minana, E. Gomez Fernandez, M. Gomez Florez,
M. A. Gomez Sanchez-Tirado, P. L. Gonzalez, F. Gutierrez Munoz,
Y. Guzman Reche, V. Hernandez Rodriguez, F. Ledesma Vinas,
A. Lozano Requena, A. Manchado, M. Martin Martin, V. Martins De Morais,
J. Montoya Gomez, J. L. Moreno Diaz, A. Nortes Nolasco, A. Ovejero Sanchez,
H. Pachon Sanchez, J. I. Pascual Gutierrez, M. A. Perez Garcia, R. Pulido,
A. Quijano Vodniza, A. Requena Villar, C. Rey Rodriguez, C. Rodrigo,
D. Rodriguez Perez, C. Sala Puig, E. Solano, J. A. Solis Ibanez,
S. Sopelana, D. Torres Fernandez, E. Tortajada Perez, J. Urbaneja Nunez,
J. Vazquez, T. Vazquez Chiscano, J. R. Vidal Blanco, B. Villarino Bouzas,
J. M. C. D. S. F. Zemar
Will Quantum Computers Scale without Inter-Chip Comms? A Structured Design Exploration to the Monolithic vs Distributed Architectures Quest
No full textBeing a very promising technology, with impressive advances in the recent years, it is still unclear how quantum computing will scale to satisfy the requirements of its most powerful applications. Although continued progress in the fabrication and control of qubits is required, quantum computing scalability will depend as well on a comprehensive architectural design considering a distributed multi-core approach as an alternative to the traditional monolithic version, hence including a communications perspective. However, this goes beyond introducing mere interconnects. Rather, it implies consolidating the full communications stack in the quantum computer structure. In this paper, we propose a double full-stack architecture encompassing quantum computation and quantum communications, which we use to address the monolithic versus distributed question with a structured design methodology. For that, we revisit the different quantum computing layers to capture and model their essence by highlighting the open design variables and performance metrics. Using behavioral models and actual measurements from existing quantum computers, the results of simulations suggest that multicore architectures may effectively unleash the full quantum computer potential.Accepted Author ManuscriptQCD/Almudever La
Resolución de problemas, patrones, regularidades, procesos de generalización, pensamiento variacional.
No full textA continuación, se presentan los resultados obtenidos de la implementación de la propuesta de intervención denominada “La resolución de problemas para promover el pensamiento variacional” desarrollada en el marco de la maestría en enseñanza de las matemáticas de la Universidad del Magdalena en la ciudad de Santa Marta. El trabajo se desarrolló dentro de la metodología de investigación acción a través de un proceso de indagación solución que finaliza con la implementación de una unidad didáctica para promover el desarrollo del pensamiento variacional en estudiantes de básica primaria. El centro de la propuesta está en un conjunto de actividades basadas en el planteamiento de problemas que requieren identificar, patrones y secuencias numéricas, procesos de representación, procesos de generalización e identificación de la variación y el cambio sin la introducción previa de conceptos, de esa manera el estudiante muestra progresos en el desarrollo del pensamiento variacional. Las actividades se desarrollaron de forma sincrónica y asincrónica con un grupo de veinte estudiantes de grado tercero de la Institución educativa Rodrigo Galvan de la Bastidas y fueron evaluadas y analizadas de forma cualitativa utilizando rubricas analíticas contruidas a partir de los aprendizajes esperados en cada una de las actividades.
Como resultado de la imlementación de la propuesta se evidenciaron avances importantes en el desarrollo del pensamiento variacional de los estudiantes ya que estos lograron identificar la variación y el cambio en situaciones de la cotidianidad y lo explican haciendo uso del lenguaje natural pero tambien usando otros tipos de representaciones, además identican patrones y regularidades en secuencias numéticas y realizan algunas genralizaciones apartir de dichas regularidades
Genome-wide analysis of cis-regulatory element structure and discovery of motif-driven gene co-expression networks in grapevine
No full textCoordinated transcriptional and metabolic reprogramming ensures a plant's continued growth and survival under adverse environmental conditions. Transcription factors (TFs) act to modulate gene expression through complex cis-regulatory element (CRE) interactions. Genome-wide analysis of known plant CREs was performed for all currently predicted protein-coding gene promoters in grapevine (Vitis vinifera L.). Many CREs such as abscisic acid (ABA)-responsive, drought-responsive, auxin-responsive, and evening elements, exhibit bona fide CRE properties such as strong position bias towards the transcription start site (TSS) and over-representation when compared with random promoters. Genes containing these CREs are enriched in a large repertoire of plant biological pathways. Large-scale transcriptome analyses also show that these CREs are highly implicated in grapevine development and stress response. Numerous CRE-driven modules in condition-specific gene co-expression networks (GCNs) were identified and many of these modules were highly enriched for plant biological functions. Several modules corroborate known roles of CREs in drought response, pathogen defense, cell wall metabolism, and fruit ripening, whereas others reveal novel functions in plants. Comparisons with Arabidopsis suggest a general conservation in promoter architecture, gene expression dynamics, and GCN structure across species. Systems analyses of CREs provide insights into the grapevine cis-regulatory code and establish a foundation for future genomic studies in grapevine. © The Author 2017. Published by Oxford University Press on behalf of Kazusa DNA Research Institute
Un final feliz: la crítica, entre el fin del análisis y el fin de la literatura
No full textThe present study introduces a survey of two different critical approaches to the work of Gabriela Liffschitz –precisely, articles by Paola Cortés Rocca and Alberto Giordano–, as well as the theoretical frames with which they dialogue, in order to highlight their explanatory inadequacies. Then, an interdisciplinary intersection with psychoanalytic theory is proposed, which enables critical considerations able to approach the productions in question, as well as to give an approach of its own epistemological presuppositions and to delimitate the literary specificity of its object of study. Around the concept of sublimation, according to Leo Bersani and Carlos Kuri, first, and to the aesthetic-lacanian considerations of Massimo Recalcati, then, a critical path is drawn, which finds, in the singularity of each text and photographic series, a properly literary way of questioning an intermedial artistic practice like Liffschitz’s. Finally, the notion of author iconography, by Jean-Luc Nancy, allows a conclusive synthesis of the conceptual reflections traced during the study.El presente trabajo comienza por exponer un relevamiento de distintas aproximaciones críticas a la obra de Gabriela Liffschitz –precisamente, artículos de Paola Cortés Rocca y Alberto Giordano–, así como de los marcos teóricos con que éstas dialogan, para luego remarcar las insuficiencias explicativas con que acaban por encontrarse. Posteriormente, se propone un cruce interdisciplinar con la teoría psicoanalítica, el cual habilita consideraciones críticas capaces no solo de abordar pertinentemente las producciones en cuestión, sino además de dar cuenta de sus propios presupuestos epistemológicos y así delimitar la especificidad literaria de su objeto de estudio. En torno del concepto de sublimación, según lo entienden Leo Bersani y Carlos Kuri, primero, y de las consideraciones estético-lacanianas de Massimo Recalcati, después, se traza un recorrido crítico que encuentra, en la singularidad de cada texto y serie fotográfica, un modo propiamente literario de interrogar una práctica artística intermedial como la de Liffschitz. Finalmente, la noción de “iconografía de autor”, de Jean-Luc Nancy, habilita una síntesis concluyente de las reflexiones conceptuales esbozadas a lo largo del trabajo
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Novelizing the dissent: Cosmopolitan literature from Latin America and South Asia
No full textThis thesis endeavors to showcase this fragmented cosmopolitanism in Global South through a comparative analysis of national identity and urban cosmopolitan space in the novels The Ministry of Utmost Happiness (2017) by the Indian author Arundhati Roy, How to get filthy rich in Rising Asia (2013) by Pakistani Mohsin Hamid, Fábula Asiática (2017) by Guatemalan Rodrigo Rey Rosa and El sueño del retorno (2013) by the Salvadoran Horacio Castellanos Moya’s. It explores the questions such as rooted and unrooted cosmopolitanism, and homelessness, and how these dynamics are dependent on social, political and geographical boundaries and how does it, in turn, shapes national identities? If there is a trend that can be traced across boundaries and if neoliberal politics and political unrest are part of a larger design? And lastly, how the artists and literary figures in the global south have been expressing their dissent against the nation
An Author without a Nation: Fictional Renderings of Leopoldo Lugones in Argentine Literature
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