Search results for " Simulation"
showing 10 items of 4034 documents
Robust design of a sheet stamping process: approaches to control the inner process variability
2011
The robustness investigation has become a crucial issue in the design of the sheet metal forming operations. The uncontrollable effects of some noise variables heavily influence the final process results, often evolving up to the failure of the process design. Therefore, tools able to handle such variability are worth developing with the aim to minimize the scattering of the investigated process performances despite of the process design. Moreover, the stamping process operations are usually characterized by objectives with conflicting behaviors and a set of compromise solutions, referred as Pareto front, is finally obtained instead of a global optimum. Therefore, the question becomes more …
Superfluid density and quasi-long-range order in the one-dimensional disordered Bose–Hubbard model
2015
We study the equilibrium properties of the one-dimensional disordered Bose-Hubbard model by means of a gauge-adaptive tree tensor network variational method suitable for systems with periodic boundary conditions. We compute the superfluid stiffness and superfluid correlations close to the superfluid to glass transition line, obtaining accurate locations of the critical points. By studying the statistics of the exponent of the power-law decay of the correlation, we determine the boundary between the superfluid region and the Bose glass phase in the regime of strong disorder and in the weakly interacting region, not explored numerically before. In the former case our simulations are in agreem…
Evolutionary dynamics of imatinib-treated leukemic cells by stochastic approach
2008
The evolutionary dynamics of a system of cancerous cells in a model of chronic myeloid leukemia (CML) is investigated by a statistical approach. Cancer progression is explored by applying a Monte Carlo method to simulate the stochastic behavior of cell reproduction and death in a population of blood cells which can experience genetic mutations. In CML front line therapy is represented by the tyrosine kinase inhibitor imatinib which strongly affects the reproduction of leukemic cells only. In this work, we analyze the effects of a targeted therapy on the evolutionary dynamics of normal, first-mutant and cancerous cell populations. Several scenarios of the evolutionary dynamics of imatinib-tr…
Polisemia e slittamenti semantici nei concetti ANIMA e CORPO nel mondo occidentale, ovvero l'Errore di San Paolo
2006
Storicamente il cristianesimo deve molto al giudaismo. Il cristianesimo di San Paolo, tuttavia, ha cambiato il modo di ragionare su concetti come il sé, il corpo, e la cognizione umana. Senza volere trattare certi concetti teologici, mi prefiggo di sottolineare come il punto di vista della scienza moderna è più vicino al giudaismo tradizionale che al cristianesimo, e di spiegare la diffusione dell’“errore” di Paolo nel mondo occidentale, analizzando la semantica dei riferimenti linguistici (e in particolar modo le metafore e le metonimie) dei concetti anima e corpo e del rapporto con la concezione del sé. Cresciuto da “uomo franco” cioè, da cittadino romano in un ambiente cosmopolita, Paolo…
Selective Change Driven Imaging: A Biomimetic Visual Sensing Strategy
2011
Selective Change Driven (SCD) Vision is a biologically inspired strategy for acquiring, transmitting and processing images that significantly speeds up image sensing. SCD vision is based on a new CMOS image sensor which delivers, ordered by the absolute magnitude of its change, the pixels that have changed after the last time they were read out. Moreover, the traditional full frame processing hardware and programming methodology has to be changed, as a part of this biomimetic approach, to a new processing paradigm based on pixel processing in a data flow manner, instead of full frame image processing.
Parole che risuonano. Usi linguistici e simulazione motoria
2012
One of the great merits of the embodied language paradigm is that of highlighting the fact that language understanding has to be led back to action and perception. The comprehension of an action-related sentence activates the same neural structures that enable the execution of that action. However, embodied language studies have been mostly focused on descriptive usages of language. Notions such as those of usage, context or pragmatic intrusion have not been sufficiently considered. A usage-based model of language will be here presented. Embodied language studies will be discussed in the light of this model.
Multiple-attribute decision support system based on fuzzy logic for performance assessment
2005
Abstract This paper deals with the problem of assessing the performance of a set of production units, simultaneously considering different kinds of information, yielded by a Data Envelopment Analysis, a qualitative data analysis and an expert assessment. The tool for integrating heterogeneous data is a model that applies fuzzy logic to decision support systems. The results obtained are a holistic performance assessment of each unit of the set and a ranking order of the units.
Accelerating collision detection for large-scale crowd simulation on multi-core and many-core architectures
2013
The computing capabilities of current multi-core and many-core architectures have been used in crowd simulations for both enhancing crowd rendering and simulating continuum crowds. However, improving the scalability of crowd simulation systems by exploiting the inherent parallelism of these architectures is still an open issue. In this paper, we propose different parallelization strategies for the collision check procedure that takes place in agent-based simulations. These strategies are designed for exploiting the parallelism in both multi-core and many-core architectures like graphic processing units (GPUs). As for the many-core implementations, we analyse the bottlenecks of a previous G…
Response determination of linear dynamical systems with singular matrices: A polynomial matrix theory approach
2017
Abstract An approach is developed based on polynomial matrix theory for formulating the equations of motion and for determining the response of multi-degree-of-freedom (MDOF) linear dynamical systems with singular matrices and subject to linear constraints. This system modeling may appear for reasons such as utilizing redundant DOFs, and can be advantageous from a computational cost perspective, especially for complex (multi-body) systems. The herein developed approach can be construed as an alternative to the recently proposed methodology by Udwadia and coworkers, and has the significant advantage that it circumvents the use of pseudoinverses in determining the system response. In fact, ba…
The analytic hierarchy process with stochastic judgements
2014
The analytic hierarchy process (AHP) is a widely-used method for multicriteria decision support based on the hierarchical decomposition of objectives, evaluation of preferences through pairwise comparisons, and a subsequent aggregation into global evaluations. The current paper integrates the AHP with stochastic multicriteria acceptability analysis (SMAA), an inverse-preference method, to allow the pairwise comparisons to be uncertain. A simulation experiment is used to assess how the consistency of judgements and the ability of the SMAA-AHP model to discern the best alternative deteriorates as uncertainty increases. Across a range of simulated problems results indicate that, according to c…