Bibliographies thématiques / FLEXIBLE COMPUTATION

Littérature scientifique sur le sujet « FLEXIBLE COMPUTATION »

Auteur : Grafiati
Publié le 10 mars 2023

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Articles de revues sur le sujet "FLEXIBLE COMPUTATION"

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Kozlov, Andrei S., et Timothy Q. Gentner. « Central auditory neurons display flexible feature recombination functions ». Journal of Neurophysiology 111, no 6 (15 mars 2014) : 1183–89. http://dx.doi.org/10.1152/jn.00637.2013.

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Recognition of natural stimuli requires a combination of selectivity and invariance. Classical neurobiological models achieve selectivity and invariance, respectively, by assigning to each cortical neuron either a computation equivalent to the logical “AND” or a computation equivalent to the logical “OR.” One powerful OR-like operation is the MAX function, which computes the maximum over input activities. The MAX function is frequently employed in computer vision to achieve invariance and considered a key operation in visual cortex. Here we explore the computations for selectivity and invariance in the auditory system of a songbird, using natural stimuli. We ask two related questions: does the MAX operation exist in auditory system? Is it implemented by specialized “MAX” neurons, as assumed in vision? By analyzing responses of individual neurons to combinations of stimuli we systematically sample the space of implemented feature recombination functions. Although we frequently observe the MAX function, we show that the same neurons that implement it also readily implement other operations, including the AND-like response. We then show that sensory adaptation, a ubiquitous property of neural circuits, causes transitions between these operations in individual neurons, violating the fixed neuron-to-computation mapping posited in the state-of-the-art object-recognition models. These transitions, however, accord with predictions of neural-circuit models incorporating divisive normalization and variable polynomial nonlinearities at the spike threshold. Because these biophysical properties are not tied to a particular sensory modality but are generic, the flexible neuron-to-computation mapping demonstrated in this study in the auditory system is likely a general property.
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Sun, Jiameng, Binrui Zhu, Jing Qin, Jiankun Hu et Jixin Ma. « Confidentiality-Preserving Publicly Verifiable Computation Schemes for Polynomial Evaluation and Matrix-Vector Multiplication ». Security and Communication Networks 2018 (21 juin 2018) : 1–15. http://dx.doi.org/10.1155/2018/5275132.

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With the development of cloud services, outsourcing computation tasks to a commercial cloud server has drawn attention of various communities, especially in the Big Data era. Public verifiability offers a flexible functionality in real circumstance where the cloud service provider (CSP) may be untrusted or some malicious users may slander the CSP on purpose. However, sometimes the computational result is sensitive and is supposed to remain undisclosed in the public verification phase, while existing works on publicly verifiable computation (PVC) fail to achieve this requirement. In this paper, we highlight the property of result confidentiality in publicly verifiable computation and present confidentiality-preserving public verifiable computation (CP-PVC) schemes for multivariate polynomial evaluation and matrix-vector multiplication, respectively. The proposed schemes work efficiently under the amortized model and, compared with previous PVC schemes for these computations, achieve confidentiality of computational results, while maintaining the property of public verifiability. The proposed schemes proved to be secure, efficient, and result-confidential. In addition, we provide the algorithms and experimental simulation to show the performance of the proposed schemes, which indicates that our proposal is also acceptable in practice.
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Kwon, Dongup, Wonsik Lee, Dongryeong Kim, Junehyuk Boo et Jangwoo Kim. « SmartFVM : A Fast, Flexible, and Scalable Hardware-based Virtualization for Commodity Storage Devices ». ACM Transactions on Storage 18, no 2 (31 mai 2022) : 1–27. http://dx.doi.org/10.1145/3511213.

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A computational storage device incorporating a computation unit inside or near its storage unit is a highly promising technology to maximize a storage server’s performance. However, to apply such computational storage devices and take their full potential in virtualized environments, server architects must resolve a fundamental challenge: cost-effective virtualization . This critical challenge can be directly addressed by the following questions: (1) how to virtualize two different hardware units (i.e., computation and storage), and (2) how to integrate them to construct virtual computational storage devices, and (3) how to provide them to users. However, the existing methods for computational storage virtualization severely suffer from their low performance and high costs due to the lack of hardware-assisted virtualization support. In this work, we propose SmartFVM-Engine , an FPGA card designed to maximize the performance and cost-effectiveness of computational storage virtualization. SmartFVM-Engine introduces three key ideas to achieve the design goals. First, it achieves high virtualization performance by applying hardware-assisted virtualization to both computation and storage units. Second, it further improves the performance by applying hardware-assisted resource orchestration for the virtualized units. Third, it achieves high cost-effectiveness by dynamically constructing and scheduling virtual computational storage devices. To the best of our knowledge, this is the first work to implement a hardware-assisted virtualization mechanism for modern computational storage devices.
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Zhang, Weixiong. « Iterative state-space reduction for flexible computation ». Artificial Intelligence 126, no 1-2 (février 2001) : 109–38. http://dx.doi.org/10.1016/s0004-3702(00)00066-7.

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Li, Lian, et Zhi Xin Huang. « Research on the Smart Grid Dispatching System Based on Cloud Computing ». Applied Mechanics and Materials 385-386 (août 2013) : 1730–33. http://dx.doi.org/10.4028/www.scientific.net/amm.385-386.1730.

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Dispatching being the core of the power operation and control, intelligent dispatching is the key point of the construction of unified and strong smart grid. During the construction of smart grid dispatching technical support system, many key points and difficulties must be addressed including massive data storage and processing, huge computational applications of security and stability assessment, unified management and flexible expansion of the system, flexible deployment and dispatching operations, integration of calculation and analysis capabilities. Based on the relevant characteristics of cloud computation, there latest technologies using cloud computation and the optimization of platform in constructing smart grid dispatching technical support system were discussed.
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Murray, Megan H., et Jeffrey D. Blume. « FDRestimation : Flexible False Discovery Rate Computation in R ». F1000Research 10 (3 juin 2021) : 441. http://dx.doi.org/10.12688/f1000research.52999.1.

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False discovery rates (FDR) are an essential component of statistical inference, representing the propensity for an observed result to be mistaken. FDR estimates should accompany observed results to help the user contextualize the relevance and potential impact of findings. This paper introduces a new user-friendly R pack-age for estimating FDRs and computing adjusted p-values for FDR control. The roles of these two quantities are often confused in practice and some software packages even report the adjusted p-values as the estimated FDRs. A key contribution of this package is that it distinguishes between these two quantities while also offering a broad array of refined algorithms for estimating them. For example, included are newly augmented methods for estimating the null proportion of findings - an important part of the FDR estimation procedure. The package is broad, encompassing a variety of adjustment methods for FDR estimation and FDR control, and includes plotting functions for easy display of results. Through extensive illustrations, we strongly encourage wider reporting of false discovery rates for observed findings.
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Murray, Megan H., et Jeffrey D. Blume. « FDRestimation : Flexible False Discovery Rate Computation in R ». F1000Research 10 (19 octobre 2021) : 441. http://dx.doi.org/10.12688/f1000research.52999.2.

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False discovery rates (FDR) are an essential component of statistical inference, representing the propensity for an observed result to be mistaken. FDR estimates should accompany observed results to help the user contextualize the relevance and potential impact of findings. This paper introduces a new user-friendly R pack-age for estimating FDRs and computing adjusted p-values for FDR control. The roles of these two quantities are often confused in practice and some software packages even report the adjusted p-values as the estimated FDRs. A key contribution of this package is that it distinguishes between these two quantities while also offering a broad array of refined algorithms for estimating them. For example, included are newly augmented methods for estimating the null proportion of findings - an important part of the FDR estimation procedure. The package is broad, encompassing a variety of adjustment methods for FDR estimation and FDR control, and includes plotting functions for easy display of results. Through extensive illustrations, we strongly encourage wider reporting of false discovery rates for observed findings.
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Zhang, Yu, Jianxin Wu, Jianfei Cai et Weiyao Lin. « Flexible Image Similarity Computation Using Hyper-Spatial Matching ». IEEE Transactions on Image Processing 23, no 9 (septembre 2014) : 4112–25. http://dx.doi.org/10.1109/tip.2014.2344296.

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Bauchau, Olivier A. « Parallel computation approaches for flexible multibody dynamics simulations ». Journal of the Franklin Institute 347, no 1 (février 2010) : 53–68. http://dx.doi.org/10.1016/j.jfranklin.2009.10.001.

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Fukui, Masaki, Jun Tanida et Yoshiki Ichioka. « Flexible-structured computation based on optical array logic ». Applied Optics 29, no 11 (10 avril 1990) : 1604. http://dx.doi.org/10.1364/ao.29.001604.

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Thèses sur le sujet "FLEXIBLE COMPUTATION"

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Xu, Ming. « Robust and flexible multi-scale medial axis computation ». Thesis, University of Birmingham, 2001. http://etheses.bham.ac.uk//id/eprint/17/.

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The principle of the multi-scale medial axis (MMA) is important in that any object is detected at a blurring scale proportional to the size of the object. Thus it provides a sound balance between noise removal and preserving detail. The robustness of the MMA has been reflected in many existing applications in object segmentation, recognition, description and registration. This thesis aims to improve the computational aspects of the MMA. The MMA is obtained by computing ridges in a “medialness” scale-space derived from an image. In computing the medialness scale-space, we propose an edge-free medialness algorithm, the Concordance-based Medial Axis Transform (CMAT). It not only depends on the symmetry of the positions of boundaries, but also is related to the symmetry of the intensity contrasts at boundaries. Therefore it excludes spurious MMA branches arising from isolated boundaries. In addition, the localisation accuracy for the position and width of an object, as well as the robustness under noisy conditions, is preserved in the CMAT. In computing ridges in the medialness space, we propose the sliding window algorithm for extracting locally optimal scale ridges. It is simple and efficient in that it can readily separate the scale dimension from the search space but avoids the difficult task of constructing surfaces of connected maxima. It can extract a complete set of MMA for interfering objects in scale-space, e.g. embedded or adjacent objects. These algorithms are evaluated using a quantitative study of their performance for 1-D signals and qualitative testing on 2-D images.
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Gog, Ionel Corneliu. « Flexible and efficient computation in large data centres ». Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/271804.

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Increasingly, online computer applications rely on large-scale data analyses to offer personalised and improved products. These large-scale analyses are performed on distributed data processing execution engines that run on thousands of networked machines housed within an individual data centre. These execution engines provide, to the programmer, the illusion of running data analysis workflows on a single machine, and offer programming interfaces that shield developers from the intricacies of implementing parallel, fault-tolerant computations. Many such execution engines exist, but they embed assumptions about the computations they execute, or only target certain types of computations. Understanding these assumptions involves substantial study and experimentation. Thus, developers find it difficult to determine which execution engine is best, and even if they did, they become “locked in” because engineering effort is required to port workflows. In this dissertation, I first argue that in order to execute data analysis computations efficiently, and to flexibly choose the best engines, the way we specify data analysis computations should be decoupled from the execution engines that run the computations. I propose an architecture for decoupling data processing, together with Musketeer, my proof-of-concept implementation of this architecture. In Musketeer, developers express data analysis computations using their preferred programming interface. These are translated into a common intermediate representation from which code is generated and executed on the most appropriate execution engine. I show that Musketeer can be used to write data analysis computations directly, and these can execute on many execution engines because Musketeer automatically generates code that is competitive with optimised hand-written implementations. The diverse execution engines cause different workflow types to coexist within a data centre, opening up both opportunities for sharing and potential pitfalls for co-location interference. However, in practice, workflows are either placed by high-quality schedulers that avoid co-location interference, but choose placements slowly, or schedulers that choose placements quickly, but with unpredictable workflow run time due to co-location interference. In this dissertation, I show that schedulers can choose high-quality placements with low latency. I develop several techniques to improve Firmament, a high-quality min-cost flow-based scheduler, to choose placements quickly in large data centres. Finally, I demonstrate that Firmament chooses placements at least as good as other sophisticated schedulers, but at the speeds associated with simple schedulers. These contributions enable more efficient and effective use of data centres for large-scale computation than current solutions.
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Radul, Alexey. « Propagation networks : a flexible and expressive substrate for computation ». Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/54635.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2009.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 167-174).
In this dissertation I propose a shift in the foundations of computation. Modem programming systems are not expressive enough. The traditional image of a single computer that has global effects on a large memory is too restrictive. The propagation paradigm replaces this with computing by networks of local, independent, stateless machines interconnected with stateful storage cells. In so doing, it offers great flexibility and expressive power, and has therefore been much studied, but has not yet been tamed for general-purpose computation. The novel insight that should finally permit computing with general-purpose propagation is that a cell should not be seen as storing a value, but as accumulating information about a value. Various forms of the general idea of propagation have been used with great success for various special purposes; perhaps the most immediate example is constraint propagation in constraint satisfaction systems. This success is evidence both that traditional linear computation is not expressive enough, and that propagation is more expressive. These special-purpose systems, however, are all complex and all different, and neither compose well, nor interoperate well, nor generalize well. A foundational layer is missing. I present in this dissertation the design and implementation of a prototype general-purpose propagation system. I argue that the structure of the prototype follows from the overarching principle of computing by propagation and of storage by accumulating information-there are no important arbitrary decisions. I illustrate on several worked examples how the resulting organization supports arbitrary computation; recovers the expressivity benefits that have been derived from special-purpose propagation systems in a single general-purpose framework, allowing them to compose and interoperate; and offers further expressive power beyond what we have known in the past. I reflect on the new light the propagation perspective sheds on the deep nature of computation.
by Alexey Andreyevich Radul.
Ph.D.
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Zukowski, Ulrich. « Flexible computation of the well-founded semantics of normal logic programs ». [S.l.] : [s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=964404036.

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Song, Weihong. « A real space approach to LEED computation with flexible local mesh refinement ». Click to view the E-thesis via HKUTO, 2004. http://sunzi.lib.hku.hk/hkuto/record/B39849004.

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Song, Weihong, et 宋慰鴻. « A real space approach to LEED computation with flexible local mesh refinement ». Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2004. http://hub.hku.hk/bib/B39849004.

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Priddle, Jacob William. « Efficient and flexible Bayesian synthetic likelihood via transformations ». Thesis, Queensland University of Technology, 2020. https://eprints.qut.edu.au/205902/1/Jacob_Priddle_Thesis.pdf.

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Simulator models are a type of stochastic model that is often used to approximate a real-life process. Current statistical methods for simulator models are computationally intensive, relying on a large number of model simulations. In this thesis, we develop new, efficient and flexible statistical methods that can be used for complex statistical models, such as simulator models. The new methods are theoretically justified and applied to a variety of simulated and real-life modelling scenarios from ecology and biology.
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Buss, Aaron Thomas. « Closing the developmental loop on the behavioral and neural dynamics of flexible rule-use ». Diss., University of Iowa, 2013. https://ir.uiowa.edu/etd/4949.

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Executive function (EF) is a central aspect of cognition that undergoes significant changes in early childhood. Changes in EF in early childhood are robustly predictive of academic achievement and general quality of life measures later in adulthood. I develop a dynamic neural field (DNF) model which provides a process-based account of behavior and developmental change in a key task used to probe the early development of executive function--the Dimensional Change Card Sort (DCCS) task. In the DCCS, children must flexibly switch from sorting cards either by shape or color to sorting by the other dimension. Typically, 3-year-olds, but not 5-year-olds, lack the flexibility to do so and perseverate on the first set of rules when instructed to switch. In Study 1, I use the DNF model to integrate behavioral and neural processes by simulating hemodynamics associated with the early emergence of flexible rule-use. I then test predictions of the model using near-infrared spectroscopy. In Study 2, I develop a DCCS that can be used with adults that sheds light on key aspects of the task as they have been revealed with children. Using fMRI, a pattern of behavioral and neural effects shed light on the central processes involved in flexible rule-use. These two studies demonstrate that performance emerges as a property of system-wide interactions and that common neurocognitive effects .can be found between childhood and adulthood.
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Thyagarajan, Senthilmurugan. « Improvements to strain computation and reliabilty analysis of flexible pavements in the mechanistic-empirical pavement design guide ». Pullman, Wash. : Washington State University, 2009. http://www.dissertations.wsu.edu/Dissertations/Spring2009/s_thyagarajan_0042309.pdf.

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Thesis (Ph. D.)--Washington State University, May 2009.
Title from PDF title page (viewed on Feb. 18, 2010). "Department of Civil and Environmental Engineering." Includes bibliographical references (p. 167-169).
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Li, Qiang. « Effects of Adaptive Discretization on Numerical Computation using Meshless Method with Live-object Handling Applications ». Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/14480.

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The finite element method (FEM) has difficulty solving certain problems where adaptive mesh is needed. Motivated by two engineering problems in live-object handling project, this research focus on a new computational method called the meshless method (MLM). This method is built upon the same theoretical framework as FEM but needs no mesh. Consequently, the computation becomes more stable and the adaptive computational scheme becomes easier to develop. In this research, we investigate practical issues related to the MLM and develop an adaptive algorithm to automatically insert additional nodes and improve computational accuracy. The study has been in the context of the two engineering problems: magnetic field computation and large deformation contact. First, we investigate the effect of two discretization methods (strong-form and weak-form) in MLM for solving linear magnetic field problems. Special techniques for handling the discontinuity boundary condition at material interfaces are proposed in both discretization methods to improve the computational accuracy. Next, we develop an adaptive computational scheme in MLM that is comprised of an error estimation algorithm, a nodal insertion scheme and a numerical integration scheme. As a more general approach, this method can automatically locate the large error region around the material interface and insert nodes accordingly to reduce the error. We further extend the adaptive method to solve nonlinear large deformation contact problems. With the ability to adaptively insert nodes during the computation, the developed method is capable of using fewer nodes for initial computation and thus, effectively improves the computational efficiency. Engineering applications of the developed methods have been demonstrated by two practical engineering problems. In the first problem, the MLM has been utilized to simulate the dynamic response of a non-contact mechanical-magnetic actuator for optimizing the design of the actuator. In the second problem, the contact between the flexible finger and the live poultry product has been analyzed by using MLM. These applications show the developed method can be applied to a broad spectrum of engineering applications where an adaptive mesh is needed.
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Livres sur le sujet "FLEXIBLE COMPUTATION"

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Portes, Jacob. Flexible Computation in Neural Circuits. [New York, N.Y.?] : [publisher not identified], 2022.

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Pai, P. Frank. Highly flexible structures : Modeling, computation, and experimentation. Reston, Va : American Institute of Aeronautics and Astronautics, 2007.

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Xu, M. Robust and flexible multi-scale medial axis computation. Birmingham : University of Birmingham, 2001.

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P, Giesy Daniel, Langley Research Center et United States. National Aeronautics and Space Administration., dir. Algorithms for efficient computation of transfer functions for large order flexible systems. Hampton, Va : National Aeronautics and Space Administration, Langley Research Center, 1998.

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Tran, Fleischer Van, et Hugh L. Dryden Flight Research Center, dir. Methods for in-flight wing shape predictions of highly flexible unmanned aerial vehicles : Formulation of Ko displacement theory. Edwards, Calif : National Aeronautics and Space Administration, Dryden Flight Research Center, 2010.

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Simeon, Bernd. Computational Flexible Multibody Dynamics. Berlin, Heidelberg : Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-35158-7.

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Yao, Shen Ji, et United States. National Aeronautics and Space Administration., dir. Computational control of flexible aerospace systems. Greensboro, N.C : North Carolina A&T State University, 1994.

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A, Brubaker Thomas, Shults James R et United States. National Aeronautics and Space Administration., dir. Computational tools for multi-linked flexible structures. [Washington, DC : National Aeronautics and Space Administration, 1990.

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Ide, Hiroshi. Unsteady full potential aeroelastic computations for flexible configurations. New York : AIAA, 1987.

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Egg, Markus. Flexible semantics for reinterpretation phenomena. Stanford, Calif : Center for the Study of Language and Information, 2005.

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Chapitres de livres sur le sujet "FLEXIBLE COMPUTATION"

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Eidenbenz, Stephan, Aris Pagourtzis et Peter Widmayer. « Flexible Train Rostering ». Dans Algorithms and Computation, 615–24. Berlin, Heidelberg : Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-540-24587-2_63.

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Endres, Markus, et Erich Glaser. « Indexing for Skyline Computation ». Dans Flexible Query Answering Systems, 31–42. Cham : Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-27629-4_6.

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Sadeh-Or, Eran, et Gal A. Kaminka. « AnySURF : Flexible Local Features Computation ». Dans Advanced Agent Technology, 270–71. Berlin, Heidelberg : Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-27216-5_17.

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Sadeh-Or, Eran, et Gal A. Kaminka. « AnySURF : Flexible Local Features Computation ». Dans Lecture Notes in Computer Science, 174–85. Berlin, Heidelberg : Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-32060-6_15.

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Singla, Samriddhi, et Ahmed Eldawy. « Flexible Computation of Multidimensional Histograms ». Dans Spatial Gems, Volume 1, 119–30. New York, NY, USA : ACM, 2022. http://dx.doi.org/10.1145/3548732.3548746.

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Huang, Zhi-Dong, Sheung-Hung Poon et Chun-Cheng Lin. « Boundary Labeling with Flexible Label Positions ». Dans Algorithms and Computation, 44–55. Cham : Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-04657-0_7.

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Kao, Ming-Yang, Manan Sanghi et Robert Schweller. « Flexible Word Design and Graph Labeling ». Dans Algorithms and Computation, 48–60. Berlin, Heidelberg : Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/11940128_7.

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Rios S., Fredy H., Lukas König et Hartmut Schmeck. « Stigmergy-Based Scheduling of Flexible Loads ». Dans Applications of Evolutionary Computation, 475–90. Cham : Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-31204-0_31.

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Fiorentino, Nicola, Cristian Molinaro et Irina Trubitsyna. « Optimizing the Computation of Approximate Certain Query Answers over Incomplete Databases ». Dans Flexible Query Answering Systems, 48–60. Cham : Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-27629-4_8.

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Sadakane, Kunihiko. « Space-Efficient Data Structures for Flexible Text Retrieval Systems ». Dans Algorithms and Computation, 14–24. Berlin, Heidelberg : Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/3-540-36136-7_2.

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Actes de conférences sur le sujet "FLEXIBLE COMPUTATION"

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Zhang, Lida, Abdolghani Ebrahimi et Diego Klabjan. « Layer Flexible Adaptive Computation Time ». Dans 2021 International Joint Conference on Neural Networks (IJCNN). IEEE, 2021. http://dx.doi.org/10.1109/ijcnn52387.2021.9534317.

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Rombado, Gabriel, Nathan Cooke, Dharma Pasala, Xianglei Ni, Andrew Low et Arya Majed. « Efficient Computation of Irregular Wave Wire Stresses in Flexible Risers ». Dans ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/omae2018-78405.

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Accurate computation of tensile armor wire stresses remains a major challenge in flexible riser fatigue life predictions and integrity management. Accuracy of the results relies heavily on capturing the kinematics of the flexible’s helically contra-wound tensile armor layers and their interaction with the other metallic and thermo-plastic layers in a dynamic simulation. The standard industry practice to assess the fatigue life of flexibles is to use high fidelity 3D Finite Element Models (FEMs) to capture the complex kinematics and produce accurate stresses. However, direct simulation of flexible riser detailed FEMs is limited to regular wave analyses and computation of wire stress time-histories subjected to irregular waves have been computationally infeasible. This is due to the complexity of the nonlinear FEM and the long simulation time of the irregular wave environment coupled with large number of fatigue sea states. As a result, simplified approaches which do not directly simulate the local model and instead assume that wire stresses can be interpolated based on static stress versus curvature material curves within a pre-defined tension /pressure envelope have been utilized. This paper utilizes Nonlinear Dynamic Substructuring (NDS), a simulation-based approach that that extends the framework of dynamic substructuring to nonlinear problems. NDS enables the efficient nonlinear dynamic simulation of multiple pitch lengths of detailed flexible riser FEM subjected to irregular wave inputs and the computation of wire stress time-histories at any location on the local model. In this paper, a 14-inch diameter flexible riser under consideration by ExxonMobil is subjected to vessel motion and wave load in irregular wave environments and is modeled using a detailed 3D FEM and simulated via NDS. The flexible riser design features four tensile armor layers to mitigate localized lateral buckling of the wires near the touch down point. Tension and curvature time-histories of the riser near the hang-off, calculated from a conventional beam model global analysis, is used to drive a 5.1m long local model. Irregular wave wire stress time-histories extracted at the corners of the tensile armor wires are used to compute the fatigue life of the flexible. To demonstrate the inaccuracies associated with the regular wave approach, fatigue life is computed via the regular wave approach and compared against the irregular wave approach. It is shown that the NDS capability to efficiently compute irregular waves mitigates over- and under-predictions due to environment idealizations leading to a more accurate and reliable flexible riser life prediction and structural integrity assessment.
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KANDIL, OSAMA, et H. CHUANG. « Unsteady flow computation of oscillating flexible wings ». Dans 31st Structures, Structural Dynamics and Materials Conference. Reston, Virigina : American Institute of Aeronautics and Astronautics, 1990. http://dx.doi.org/10.2514/6.1990-937.

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Gawronski, Wodek. « Computation of H∞ norm for flexible structures ». Dans 1993 American Control Conference. IEEE, 1993. http://dx.doi.org/10.23919/acc.1993.4793077.

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Song, Linqi, Sundara Rajan Srinivasavaradhan et Christina Fragouli. « The benefit of being flexible in distributed computation ». Dans 2017 IEEE Information Theory Workshop (ITW). IEEE, 2017. http://dx.doi.org/10.1109/itw.2017.8278019.

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Tanida, Jun, Masaki Fukui et Yoshiki Ichioka. « Flexible-Structured Computation Base on Optical Array Logic ». Dans Optical Computing. Washington, D.C. : Optica Publishing Group, 1989. http://dx.doi.org/10.1364/optcomp.1989.wa3.

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Optical computing techniques have excellent features for large capacity information processing, such as massively parallelism, high speed processing, crosstalk free interconnection capability, and so on. Among those features, reconfigurability of optical processing systems should be stressed. To utilize this excellent feature, we have considered flexible-structured computation with optical array logic (OAL).1,2 The programmability of OAL is fully utilized for designing such a flexible-structured computing system.
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Inui, Masatomo, Nobuyuki Umezu et Yuuki Shinozuka. « A Comparison of Two Methods for Geometric Milling Simulation Accelerated by GPU ». Dans ASME/ISCIE 2012 International Symposium on Flexible Automation. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/isfa2012-7170.

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For detecting potential problems of a cutter path, cutting force simulation in the NC milling process is necessary prior to actual machining. A milling operation is geometrically equivalent to a Boolean subtraction of the swept volume of a cutter moving along a path from a solid model representing the stock shape. In order to precisely estimate the cutting force, the subtraction operation must be executed for every small motion of the cutter. The performance and the cost of the polygon rendering LSI called GPU are dramatically improved these days. By using GPU, the required time for critical computations in the geometric milling simulation can be drastically reduced. In this paper, the computation speed of two known GPU accelerated milling simulation methods, which are the depth buffer based method and the parallel processing based method with CUDA language, are compared. Computational experiments with complex milling simulations show that the implementation with CUDA is several times faster than the depth buffer based method when the cutter motion in the simulation process is sufficiently small.
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Holjevac, Ninoslav, Tomislav Capuder, Igor Kuzle, Ning Zhang et Chongquing Kang. « Modelling Aspects of Flexible Multi-Energy Microgrids ». Dans 2018 Power Systems Computation Conference (PSCC). IEEE, 2018. http://dx.doi.org/10.23919/pscc.2018.8442468.

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Xu, Lingyu, Na Zhang, Wentao Huang et Shijie Sun. « Multi-text Fusion Computation Based on Flexible Interval Control ». Dans 2008 9th International Conference for Young Computer Scientists (ICYCS). IEEE, 2008. http://dx.doi.org/10.1109/icycs.2008.105.

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Zhu, Jinbao, et Songze Li. « Generalized Lagrange Coded Computing : A Flexible Computation-Communication Tradeoff ». Dans 2022 IEEE International Symposium on Information Theory (ISIT). IEEE, 2022. http://dx.doi.org/10.1109/isit50566.2022.9834535.

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Rapports d'organisations sur le sujet "FLEXIBLE COMPUTATION"

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Beach, Robert, Duncan Prahl et Rich Lange. Computational Fluid Dynamics Analysis of Flexible Duct Junction Box Design. Office of Scientific and Technical Information (OSTI), décembre 2013. http://dx.doi.org/10.2172/1117056.

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Beach, Robert, Duncan Prahl et Rich Lange. Computational Fluid Dynamics Analysis of Flexible Duct Junction Box Design. Office of Scientific and Technical Information (OSTI), décembre 2013. http://dx.doi.org/10.2172/1220913.

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Bergen, Benjamin Karl. FleCSI. Developing Flexible Computational Science Infrastructure for Multi-Physics Application Development. Office of Scientific and Technical Information (OSTI), février 2016. http://dx.doi.org/10.2172/1237413.

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Bergen, Benjamin Karl. The Flexible Computational Science Infrastructure (FleCSI) : Overview & ; Control Model Updates. Office of Scientific and Technical Information (OSTI), juin 2018. http://dx.doi.org/10.2172/1440504.

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Cohen, Jonathan D. Second Generation Flexible Computing Environment for Computational Modeling of Brain Function and Neuroimaging Data Analysis. Fort Belvoir, VA : Defense Technical Information Center, septembre 2010. http://dx.doi.org/10.21236/ada530764.

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Cook, Joshua, Laura Ray et James Lever. Dynamics modeling and robotic-assist, leader-follower control of tractor convoys. Engineer Research and Development Center (U.S.), février 2022. http://dx.doi.org/10.21079/11681/43202.

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This paper proposes a generalized dynamics model and a leader-follower control architecture for skid-steered tracked vehicles towing polar sleds. The model couples existing formulations in the literature for the powertrain components with the vehicle-terrain interaction to capture the salient features of terrain trafficability and predict the vehicles response. This coupling is essential for making realistic predictions of the vehicles traversing capabilities due to the power-load relationship at the engine output. The objective of the model is to capture adequate fidelity of the powertrain and off-road vehicle dynamics while minimizing the computational cost for model based design of leader-follower control algorithms. The leader-follower control architecture presented proposes maintaining a flexible formation by using a look-ahead technique along with a way point following strategy. Results simulate one leader-follower tractor pair where the leader is forced to take an abrupt turn and experiences large oscillations of its drawbar arm indicating potential payload instability. However, the follower tractor maintains the flexible formation but keeps its payload stable. This highlights the robustness of the proposed approach where the follower vehicle can reject errors in human leader driving.
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Heymsfield, Ernie, et Jeb Tingle. State of the practice in pavement structural design/analysis codes relevant to airfield pavement design. Engineer Research and Development Center (U.S.), mai 2021. http://dx.doi.org/10.21079/11681/40542.

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An airfield pavement structure is designed to support aircraft live loads for a specified pavement design life. Computer codes are available to assist the engineer in designing an airfield pavement structure. Pavement structural design is generally a function of five criteria: the pavement structural configuration, materials, the applied loading, ambient conditions, and how pavement failure is defined. The two typical types of pavement structures, rigid and flexible, provide load support in fundamentally different ways and develop different stress distributions at the pavement – base interface. Airfield pavement structural design is unique due to the large concentrated dynamic loads that a pavement structure endures to support aircraft movements. Aircraft live loads that accompany aircraft movements are characterized in terms of the load magnitude, load area (tire-pavement contact surface), aircraft speed, movement frequency, landing gear configuration, and wheel coverage. The typical methods used for pavement structural design can be categorized into three approaches: empirical methods, analytical (closed-form) solutions, and numerical (finite element analysis) approaches. This article examines computational approaches used for airfield pavement structural design to summarize the state-of-the-practice and to identify opportunities for future advancements. United States and non-U.S. airfield pavement structural codes are reviewed in this article considering their computational methodology and intrinsic qualities.
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González-Montaña, Luis Antonio. Semantic-based methods for morphological descriptions : An applied example for Neotropical species of genus Lepidocyrtus Bourlet, 1839 (Collembola : Entomobryidae). Verlag der Österreichischen Akademie der Wissenschaften, novembre 2021. http://dx.doi.org/10.1553/biosystecol.1.e71620.

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The production of semantic annotations has gained renewed attention due to the development of anatomical ontologies and the documentation of morphological data. Two methods are proposed in this production, differing in their methodological and philosophical approaches: class-based method and instance-based method. The first, the semantic annotations are established as class expressions, while in the second, the annotations incorporate individuals. An empirical evaluation of the above methods was applied in the morphological description of Neotropical species of the genus Lepidocyrtus (Collembola: Entomobryidae: Lepidocyrtinae). The semantic annotations are expressed as RDF triple, which is a language most flexible than the Entity-Quality syntax used commonly in the description of phenotypes. The morphological descriptions were built in Protégé 5.4.0 and stored in an RDF store created with Fuseki Jena. The semantic annotations based on RDF triple increase the interoperability and integration of data from diverse sources, e.g., museum data. However, computational challenges are present, which are related with the development of semi-automatic methods for the generation of RDF triple, interchanging between texts and RDF triple, and the access by non-expert users.
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Wu, Yingjie, Selim Gunay et Khalid Mosalam. Hybrid Simulations for the Seismic Evaluation of Resilient Highway Bridge Systems. Pacific Earthquake Engineering Research Center, University of California, Berkeley, CA, novembre 2020. http://dx.doi.org/10.55461/ytgv8834.

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Bridges often serve as key links in local and national transportation networks. Bridge closures can result in severe costs, not only in the form of repair or replacement, but also in the form of economic losses related to medium- and long-term interruption of businesses and disruption to surrounding communities. In addition, continuous functionality of bridges is very important after any seismic event for emergency response and recovery purposes. Considering the importance of these structures, the associated structural design philosophy is shifting from collapse prevention to maintaining functionality in the aftermath of moderate to strong earthquakes, referred to as “resiliency” in earthquake engineering research. Moreover, the associated construction philosophy is being modernized with the utilization of accelerated bridge construction (ABC) techniques, which strive to reduce the impact of construction on traffic, society, economy and on-site safety. This report presents two bridge systems that target the aforementioned issues. A study that combined numerical and experimental research was undertaken to characterize the seismic performance of these bridge systems. The first part of the study focuses on the structural system-level response of highway bridges that incorporate a class of innovative connecting devices called the “V-connector,”, which can be used to connect two components in a structural system, e.g., the column and the bridge deck, or the column and its foundation. This device, designed by ACII, Inc., results in an isolation surface at the connection plane via a connector rod placed in a V-shaped tube that is embedded into the concrete. Energy dissipation is provided by friction between a special washer located around the V-shaped tube and a top plate. Because of the period elongation due to the isolation layer and the limited amount of force transferred by the relatively flexible connector rod, bridge columns are protected from experiencing damage, thus leading to improved seismic behavior. The V-connector system also facilitates the ABC by allowing on-site assembly of prefabricated structural parts including those of the V-connector. A single-column, two-span highway bridge located in Northern California was used for the proof-of-concept of the proposed V-connector protective system. The V-connector was designed to result in an elastic bridge response based on nonlinear dynamic analyses of the bridge model with the V-connector. Accordingly, a one-third scale V-connector was fabricated based on a set of selected design parameters. A quasi-static cyclic test was first conducted to characterize the force-displacement relationship of the V-connector, followed by a hybrid simulation (HS) test in the longitudinal direction of the bridge to verify the intended linear elastic response of the bridge system. In the HS test, all bridge components were analytically modeled except for the V-connector, which was simulated as the experimental substructure in a specially designed and constructed test setup. Linear elastic bridge response was confirmed according to the HS results. The response of the bridge with the V-connector was compared against that of the as-built bridge without the V-connector, which experienced significant column damage. These results justified the effectiveness of this innovative device. The second part of the study presents the HS test conducted on a one-third scale two-column bridge bent with self-centering columns (broadly defined as “resilient columns” in this study) to reduce (or ultimately eliminate) any residual drifts. The comparison of the HS test with a previously conducted shaking table test on an identical bridge bent is one of the highlights of this study. The concept of resiliency was incorporated in the design of the bridge bent columns characterized by a well-balanced combination of self-centering, rocking, and energy-dissipating mechanisms. This combination is expected to lead to minimum damage and low levels of residual drifts. The ABC is achieved by utilizing precast columns and end members (cap beam and foundation) through an innovative socket connection. In order to conduct the HS test, a new hybrid simulation system (HSS) was developed, utilizing commonly available software and hardware components in most structural laboratories including: a computational platform using Matlab/Simulink [MathWorks 2015], an interface hardware/software platform dSPACE [2017], and MTS controllers and data acquisition (DAQ) system for the utilized actuators and sensors. Proper operation of the HSS was verified using a trial run without the test specimen before the actual HS test. In the conducted HS test, the two-column bridge bent was simulated as the experimental substructure while modeling the horizontal and vertical inertia masses and corresponding mass proportional damping in the computer. The same ground motions from the shaking table test, consisting of one horizontal component and the vertical component, were applied as input excitations to the equations of motion in the HS. Good matching was obtained between the shaking table and the HS test results, demonstrating the appropriateness of the defined governing equations of motion and the employed damping model, in addition to the reliability of the developed HSS with minimum simulation errors. The small residual drifts and the minimum level of structural damage at large peak drift levels demonstrated the superior seismic response of the innovative design of the bridge bent with self-centering columns. The reliability of the developed HS approach motivated performing a follow-up HS study focusing on the transverse direction of the bridge, where the entire two-span bridge deck and its abutments represented the computational substructure, while the two-column bridge bent was the physical substructure. This investigation was effective in shedding light on the system-level performance of the entire bridge system that incorporated innovative bridge bent design beyond what can be achieved via shaking table tests, which are usually limited by large-scale bridge system testing capacities.
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