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Littérature scientifique sur le sujet « D-separation criterion »

Auteur : Grafiati

Publié le 9 mars 2023

Mis à jour le 31 juillet 2025

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Articles de revues sur le sujet "D-separation criterion"

Băncioiu, Camil, and Remus Brad. "Analyzing Markov Boundary Discovery Algorithms in Ideal Conditions Using the d-Separation Criterion." Algorithms 15, no. 4 (2022): 105. http://dx.doi.org/10.3390/a15040105.

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This article proposes the usage of the d-separation criterion in Markov Boundary Discovery algorithms, instead of or alongside the statistical tests of conditional independence these algorithms usually rely on. This is a methodological improvement applicable when designing, studying or improving such algorithms, but it is not applicable for productive use, because computing the d-separation criterion requires complete knowledge of a Bayesian network. Yet Bayesian networks can be made available to the algorithms when studied in controlled conditions. This approach has the effect of removing sou

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Habib, M. A., H. M. Badr, S. A. M. Said, I. Hussaini, and J. J. Al-Bagawi. "On the Development of Deadleg Criterion." Journal of Fluids Engineering 127, no. 1 (2005): 124–35. http://dx.doi.org/10.1115/1.1852481.

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Corrosion in deadlegs occurs as a result of water separation due to the very low flow velocity. This work aims to investigate the effect of geometry and orientation on flow field and oil/water separation in deadlegs in an attempt for the development of a deadleg criterion. The investigation is based on the solution of the mass and momentum conservation equations of an oil/water mixture together with the volume fraction equation for the secondary phase. Results are obtained for two main deadleg orientations and for different lengths of the deadleg in each orientation. The considered fluid mixtu

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Neal, R. M. "On Deducing Conditional Independence from d-Separation in Causal Graphs with Feedback (Research Note)." Journal of Artificial Intelligence Research 12 (March 1, 2000): 87–91. http://dx.doi.org/10.1613/jair.689.

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Pearl and Dechter (1996) claimed that the d-separation criterion for conditional independence in acyclic causal networks also applies to networks of discrete variables that have feedback cycles, provided that the variables of the system are uniquely determined by the random disturbances. I show by example that this is not true in general. Some condition stronger than uniqueness is needed, such as the existence of a causal dynamics guaranteed to lead to the unique solution.

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Richards, K. J., D. A. Smeed, E. J. Hopfinger, and G. Chabert D'Hières. "Boundary-layer separation of rotating flows past surface-mounted obstacles." Journal of Fluid Mechanics 237 (April 1992): 343–71. http://dx.doi.org/10.1017/s0022112092003446.

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This paper describes laboratory experiments on the flow over a three-dimensional hill in a rotating fluid. The experiments were carried out in towing tanks, placed on rotating tables. Rotation is found to have a strong influence on the separation behind the hill. The topology of the separation is found to be the same for all the flows examined. The Rossby number R in the experiments is of order 1, the maximum value being 6. The separated flow is dominated by a single trailing vortex. In the majority of cases the surface stress field has a single separation line and there are no singular points

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Framstad, Nils Chr. "Portfolio Theory forα-Symmetric and Pseudoisotropic Distributions:k-Fund Separation and the CAPM". Journal of Probability and Statistics 2015 (2015): 1–11. http://dx.doi.org/10.1155/2015/235452.

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The shifted pseudoisotropic multivariate distributions are shown to satisfy Ross’ stochastic dominance criterion for two-fund monetary separation in the case with risk-free investment opportunity and furthermore to admit the Capital Asset Pricing Model under an embedding inLαcondition if1<α≤2, with the betas given in an explicit form. For theα-symmetric subclass, the market without risk-free investment opportunity admits2d-fund separation ifα=1+1/(2d-1),d∈N, generalizing the classical elliptical cased=1, and we also give the precise number of funds needed, from which it follows that we cann

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Rhein, Frank, Haoran Ji, and Hermann Nirschl. "Multidimensional Separation by Magnetic Seeded Filtration: Theoretical Study." Powders 3, no. 2 (2024): 217–32. http://dx.doi.org/10.3390/powders3020014.

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Magnetic seeded filtration (MSF) is a multidimensional solid–liquid separation process capable of fractionating a multimaterial suspension based on particle size and surface properties. It relies on the selective hetero-agglomeration between nonmagnetic target and magnetic seed particles followed by a magnetic separation. Experimental investigations of multimaterial suspensions are challenging and limited. Therefore, a Monte Carlo model for the simulation of hetero-agglomeration processes is developed, validated, and compared to a discrete population balance model. The numerical investigation

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Zhang, Jiawei, Yong Gu, Aihua Chen, and Yuguo Yu. "Unveiling Dynamic System Strategies for Multisensory Processing: From Neuronal Fixed-Criterion Integration to Population Bayesian Inference." Research 2022 (August 20, 2022): 1–20. http://dx.doi.org/10.34133/2022/9787040.

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Multisensory processing is of vital importance for survival in the external world. Brain circuits can both integrate and separate visual and vestibular senses to infer self-motion and the motion of other objects. However, it is largely debated how multisensory brain regions process such multisensory information and whether they follow the Bayesian strategy in this process. Here, we combined macaque physiological recordings in the dorsal medial superior temporal area (MST-d) with modeling of synaptically coupled multilayer continuous attractor neural networks (CANNs) to study the underlying neu

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Aghsaee, Payam, Leon Boegman, Peter J. Diamessis, and Kevin G. Lamb. "Boundary-layer-separation-driven vortex shedding beneath internal solitary waves of depression." Journal of Fluid Mechanics 690 (November 24, 2011): 321–44. http://dx.doi.org/10.1017/jfm.2011.432.

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AbstractWe investigate global instability and vortex shedding in the separated laminar boundary layer beneath internal solitary waves (ISWs) of depression in a two-layer stratified fluid by performing high-resolution two-dimensional direct numerical simulations. The simulations were conducted with waves propagating over a flat bottom and shoaling over relatively mild $(S= 0. 05)$ and steep $(S= 0. 1)$ slopes. Over a flat bottom, the potential for vortex shedding is shown to be directly dependent on wave amplitude, for a particular stratification, owing to increase of the adverse pressure gradi

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Malamataris, N. A., I. E. Sarris, D. P. Pazis, and A. Liakos. "A comprehensive study of the onset of boundary layer separation in the unbounded flow around a circular cylinder." Physics of Fluids 34, no. 10 (2022): 103607. http://dx.doi.org/10.1063/5.0101413.

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The onset of boundary layer separation in the unbounded flow around a circular cylinder is determined directly with a numerical experiment with accuracy to the second decimal point of the Reynolds number, Re. The governing equations are the steady state, two dimensional Navier–Stokes equations, which are solved with Galerkin finite elements. A new criterion, the entrance ratio [Formula: see text] with D the diameter of the cylinder and L the entrance length of the domain, is introduced in addition to the traditional blockage ratio; the aim is to establish conditions for unbounded flow in both

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Cheng, W., D. I. Pullin, and R. Samtaney. "Large-eddy simulation of flow over a grooved cylinder up to transcritical Reynolds numbers." Journal of Fluid Mechanics 835 (November 27, 2017): 327–62. http://dx.doi.org/10.1017/jfm.2017.767.

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We report wall-resolved large-eddy simulation (LES) of flow over a grooved cylinder up to the transcritical regime. The stretched-vortex subgrid-scale model is embedded in a general fourth-order finite-difference code discretization on a curvilinear mesh. In the present study $32$ grooves are equally distributed around the circumference of the cylinder, each of sinusoidal shape with height $\unicode[STIX]{x1D716}$, invariant in the spanwise direction. Based on the two parameters, $\unicode[STIX]{x1D716}/D$ and the Reynolds number $Re_{D}=U_{\infty }D/\unicode[STIX]{x1D708}$ where $U_{\infty }$

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Thèses sur le sujet "D-separation criterion"

CALIGARIS, SILVIA. "A Causal Graphs - based approach for assessing gender disparities: an application to child health & nutrition in China." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2014. http://hdl.handle.net/10281/83241.

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Most of gender statistical measures proposed in the last decades are in fact composite indicators, i.e. weighted linear combinations of basic statistics such as ratios, percentages etc. Composite indicators then involves several arbitrary choices -for instance the weighting/aggregating system, variables selection, standardization affecting both indexes transparency and interpretation. Furthermore gender inequality is a complex latent phenomenon, a collection of disparate and inter-linked issues that can be hardly caught in a single indicator. The development of statistical tools and

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Chapitres de livres sur le sujet "D-separation criterion"

Hofer-Szabó, Gábor. "Bell’s Local Causality is a d-Separation Criterion." In Springer Proceedings in Mathematics & Statistics. Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-2487-1_2.

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Actes de conférences sur le sujet "D-separation criterion"

Rienstra, Tjitze, Matthias Thimm, Kristian Kersting, and Xiaoting Shao. "Independence and D-separation in Abstract Argumentation." In 17th International Conference on Principles of Knowledge Representation and Reasoning {KR-2020}. International Joint Conferences on Artificial Intelligence Organization, 2020. http://dx.doi.org/10.24963/kr.2020/73.

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We investigate the notion of independence in abstract argumentation, i.e., the question of whether the evaluation of one set of arguments is independent of the evaluation of another set of arguments, given that we already know the status of a third set of arguments. We provide a semantic definition of this notion and develop a method to discover independencies based on transforming an argumentation framework into a DAG on which we then apply the well-known d-separation criterion. We also introduce the SCC Markov property for argumentation semantics, which generalises the Markov property from t

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Kim, Y., Y. J. Chao, and P. S. Lam. "Numerical Simulation of Cup-Cone Fracture in a Round Tensile Bar." In ASME 2008 Pressure Vessels and Piping Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/pvp2008-61186.

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Cup and cone fracture for a round tensile bar under tension is analyzed numerically using finite element method. Finite strain analysis with general solid elements is performed to simulate the development of necking, flat cracking at the center of the bar, propagation of the flat crack towards the free surface, and then slant 45° cracking leading to the final separation of the tensile bar. The key fracture stages and parameters in the simulation of this entire process include (a) a fracture criterion for the flat cracking at the center of the bar, (b) flat crack propagation using a constant cr

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Zhu, Haiwen, Jianjun Zhu, Jiecheng Zhang, and Hong-Quan Zhang. "Efficiency and Critical Velocity Analysis of Gravitational Separator Through CFD Simulation." In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-71230.

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Oil and gas producing rates have increased rapidly with the development of shale oil and fracturing technology. Besides, advances in horizontal wells have increased the slugging issue, especially in complex geometry wells. Therefore, Artificial lift systems, especially rod-pumps and electrical submersible pumps, always suffer from associated gas and require an economical way to avoid problems like gas lock, gas pound, gas interference and slugging. Among all kinds of the downhole separator, and the gravitational separator are the most economical devices, which can handle severe slugging proble

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Cao, Teng, Nagabhushana Rao Vadlamani, Paul G. Tucker, Angus R. Smith, Michal Slaby, and Christopher T. J. Sheaf. "Fan-Intake Interaction Under High Incidence." In ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/gt2016-56561.

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In this paper, we present an extensive numerical study on the interaction between the downstream fan and the flow separating over an intake under high incidence. The objectives of this investigation are twofold: (a) to gain qualitative insight into the mechanism of fan-intake interaction and (b) to quantitatively examine the sensitivity of the flow distortion (in terms of distortion coefficient DC60), to the key design parameters of the intake (Length, L / Diameter, D). Both steady and unsteady Reynolds Averaged Numerical Simulations (RANS) were carried out. For the steady calculations, a low

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Perl, M., Q. Ma, and C. Levy. "The Influence of a Non-Aligned Semi-Elliptical Surface Crack on a Quarter-Circle Corner Crack in an Infinitely Large Plate Under Uniaxial Tension." In ASME 2016 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/pvp2016-63081.

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The evaluation of non-aligned multiple cracks is required in various fitness-for-service codes. For non-aligned parallel cracks, on-site inspection needs to decide whether the cracks should be treated as coalesced or separate multiple cracks for Fitness-for-Service. In the existing literature, criteria and standards for the adjustment of multiple nonaligned cracks are very source dependent, and those criteria and standards are often derived from on-site service experience without rigorous and systematic verification. Based on this observation, the authors previously reported on the effect betw

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Levy, C., M. Perl, and Q. Ma. "The Effect of a Quarter-Circle Corner Crack on the Distribution of the SIF Along the Front of a Non-Aligned Semi-Elliptical Surface Crack in an Infinitely Large Plate Under Uniaxial Tension." In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-72468.

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The evaluation of the mutual effect of non-aligned multiple cracks is a prerequisite in applying fitness-for-service codes. For non-aligned parallel cracks, during on-site inspection, one needs to decide whether the cracks should be treated as coalesced or separate multiple cracks for Fitness-for-Service. In the existing literature, criteria and standards for the adjustment of multiple nonaligned cracks are very source dependent, and those criteria and standards are often derived from on-site service experience without rigorous and systematic verification. Based on this observation, the author

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Gallus, H. E., and H. Hoenen. "Experimental Investigations of Airfoil- and Endwall Boundary Layers in a Subsonic Compressor Stage." In ASME 1986 International Gas Turbine Conference and Exhibit. American Society of Mechanical Engineers, 1986. http://dx.doi.org/10.1115/86-gt-143.

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Criteria for the maximum diffusion allowable in a blade row without reaching stall play an important part in the design of highly loaded axial-flow compressors. Most of these criteria for maximum blade loading were derived from wind tunnel measurements of 2-d-steady cascade flow. As the flow field in turbomachines is extremely unsteady and of three-dimensional nature the boundary layers are influenced by these effects. The paper deals with the results of boundary layer measurements in a stator blade channel of a subsonic axial-flow compressor stage at various operating points between unthrottl

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Hustad, Carl-W., Inge Trondstad, Roger E. Anderson, Keith L. Pronske, and Fermin Viteri. "Optimization of Thermodynamically Efficient Nominal 40 MW Zero Emission Pilot and Demonstration Power Plant in Norway." In ASME Turbo Expo 2005: Power for Land, Sea, and Air. ASMEDC, 2005. http://dx.doi.org/10.1115/gt2005-68640.

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In Aug 2004 the Zero Emission Norwegian Gas (ZENG) project team completed Phase-1: Concept and Feasibility Study for a 40 MW Pilot & Demonstration (P&D) Plant, that is proposed will be located at the Energy Park, Risavika, near Stavanger in South Norway during 2008. The power plant cycle is based upon implementation of the natural gas (NG) and oxygen fueled Gas Generator (GG) (1500°F/1500 psi) successfully demonstrated by Clean Energy Systems (CES) Inc. The GG operations was originally tested in Feb 2003 and is currently (Feb 2005) undergoing extensive commissioning at the CES 5MW Kimb

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Perl, M., C. Levy, and Q. Ma. "The Reciprocal Effect Among a Quarter-Circle Corner Crack and a Non-Aligned Surface Crack of Comparable Size in an Infinitely Large Plate Under Uniaxial Tension." In ASME 2018 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/pvp2018-84035.

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The reciprocal effect between a quarter-circle corner crack and a non-aligned surface crack of comparable size is addressed in the present study. The significance of understanding the reciprocal effect between the non-aligned parallel cracks is to assist in the evaluation of non-aligned multiple cracks as required in various fitness-for-service codes. For non-aligned parallel cracks, on-site inspection needs to decide whether the cracks should be treated as coalesced or separate multiple cracks. In the existing literature, criteria and standards for the adjustment of multiple non-aligned crack

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Langtry, R. B., F. R. Menter, S. R. Likki, Y. B. Suzen, P. G. Huang, and S. Vo¨lker. "A Correlation-Based Transition Model Using Local Variables: Part II — Test Cases and Industrial Applications." In ASME Turbo Expo 2004: Power for Land, Sea, and Air. ASMEDC, 2004. http://dx.doi.org/10.1115/gt2004-53454.

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A new correlation-based transition model has been developed, which is built strictly on local variables. As a result, the transition model is compatible with modern CFD methods using unstructured grids and massive parallel execution. The model is based on two transport equations, one for the intermittency and one for the transition onset criteria in terms of momentum thickness Reynolds number. The proposed transport equations do not attempt to model the physics of the transition process (unlike e.g. turbulence models), but form a framework for the implementation of correlation-based models int

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