437 research outputs found
Kotter\u27s Model for Change and Distributed Leadership: A Multifaceted Approach for Canadian Colleges to Become Less Reliant on Operating Grant Funding
The emergence of performance-based frameworks for funding and declining government operating grant funding are contemporary challenges for Canadian public higher education institutions. Operating grants are a sizable portion of the funding institutions receive from the provincial government, and continued conditions on and declines in these grants pose significant risks to the sustainability and viability of these public institutions. Higher education institutions today need to become less reliant on government funds while remaining aligned with mandates to provide the programs and services necessary to meet the needs of the regions and communities they serve. Frontier College (a pseudonym) has revenue diversification strategies in place, but these strategies were developed with individual departmental needs in mind rather than an institutional focus. This Organizational Improvement Plan demonstrates how a distributed leadership approach with an iterative implementation of Kotter’s eight-step model for change can be used to institutionalize the college’s revenue diversification strategies. Because revenue diversification strategies may involve entrepreneurial activity that is outside typical college operations, the change initiative will be led through the lens of equity, diversity, inclusivity, and decolonization to ensure that all initiatives align with Frontier College’s strategic plan without compromising the institution’s mandates, vision, or mission. This plan also demonstrates how a balanced scorecard can be used as an effective monitoring, evaluation, and communication tool throughout the change process, allowing leaders to collaborate with employees to adjust, amend, and alter plans as they revisit Kotter’s steps together to successfully embed the change within the college’s culture
Krylov-based algebraic multigrid for edge elements
International audienceThis work tackles the evaluation of a multigrid cycling strategy using inner flexible Krylov subspace iterations. It provides a valuable improvement to the Reitzinger and Sch¨oberl algebraic multigrid method for systems coming from edge element discretization
Model Integration and Coupling in A Hydroinformatics System
Source: ICHE Conference Archive - https://mdi-de.baw.de/icheArchiv
Models for Metal Hydride Particle Shape, Packing, and Heat Transfer
A multiphysics modeling approach for heat conduction in metal hydride powders
is presented, including particle shape distribution, size distribution,
granular packing structure, and effective thermal conductivity. A statistical
geometric model is presented that replicates features of particle size and
shape distributions observed experimentally that result from cyclic hydride
decreptitation. The quasi-static dense packing of a sample set of these
particles is simulated via energy-based structural optimization methods. These
particles jam (i.e., solidify) at a density (solid volume fraction) of
0.665+/-0.015 - higher than prior experimental estimates. Effective thermal
conductivity of the jammed system is simulated and found to follow the behavior
predicted by granular effective medium theory. Finally, a theory is presented
that links the properties of bi-porous cohesive powders to the present systems
based on recent experimental observations of jammed packings of fine powder.
This theory produces quantitative experimental agreement with metal hydride
powders of various compositions.Comment: 12 pages, 12 figures, 2 table
A simple and efficient segregated smoother for the discrete Stokes equations
We consider the multigrid solution of the generalized Stokes equations with a segre- gated (i.e., equationwise) Gauss–Seidel smoother based on a Uzawa-type iteration. We analyze the smoother in the framework of local Fourier analysis, and obtain an analytic bound on the smoothing factor showing uniform performance for a family of Stokes problems. These results are confirmed by the numerical computation of the two-grid convergence factor for different types of grids and dis- cretizations. Numerical results also show that the actual convergence of the W-cycle is approximately the same as that obtained by a Vanka smoother, despite this latter smoother being significantly more costly per iteration step
Adaptive precision in block-Jacobi preconditioning for iterative sparse linear system solvers
This is the peer reviewed version of the following article: Anzt, H, Dongarra, J, Flegar, G, Higham, NJ, Quintana-OrtÃ, ES. Adaptive precision in block-Jacobi preconditioning for iterative sparse linear system solvers. Concurrency Computat Pract Exper. 2019; 31:e4460, which has been published in final form at https://doi.org/10.1002/cpe.4460. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.[EN] We propose an adaptive scheme to reduce communication overhead caused by data movement by selectively storing the diagonal blocks of a block-Jacobi preconditioner in different precision formats (half, single, or double). This specialized preconditioner can then be combined with any Krylov subspace method for the solution of sparse linear systems to perform all arithmetic in double precision. We assess the effects of the adaptive precision preconditioner on the iteration count and data transfer cost of a preconditioned conjugate gradient solver. A preconditioned conjugate gradient method is, in general, a memory bandwidth-bound algorithm, and therefore its execution time and energy consumption are largely dominated by the costs of accessing the problem's data in memory. Given this observation, we propose a model that quantifies the time and energy savings of our approach based on the assumption that these two costs depend linearly on the bit length of a floating point number. Furthermore, we use a number of test problems from the SuiteSparse matrix collection to estimate the potential benefits of the adaptive block-Jacobi preconditioning scheme.Impuls und Vernetzungsfond of the Helmholtz Association, Grant/Award Number: VH-NG-1241; MINECO and FEDER, Grant/Award Number: TIN2014-53495-R; H2020 EU FETHPC Project, Grant/Award Number: 732631; MathWorks; Engineering and Physical Sciences Research Council, Grant/Award Number: EP/P020720/1; Exascale Computing Project, Grant/Award Number: 17-SC-20-SCAnzt, H.; Dongarra, J.; Flegar, G.; Higham, NJ.; Quintana OrtÃ, ES. (2019). Adaptive precision in block-Jacobi preconditioning for iterative sparse linear system solvers. Concurrency and Computation Practice and Experience. 31(6):1-12. https://doi.org/10.1002/cpe.4460S112316Saad, Y. (2003). Iterative Methods for Sparse Linear Systems. doi:10.1137/1.9780898718003Anzt H Dongarra J Flegar G Quintana-Ortà ES Batched Gauss-Jordan elimination for block-Jacobi preconditioner generation on GPUs 2017 Austin, TX http://doi.acm.org/10.1145/3026937.3026940Anzt H Dongarra J Flegar G Quintana-Ortà ES Variable-size batched LU for small matrices and its integration into block-Jacobi preconditioning 2017 Bristol, UK https://doi.org/10.1109/ICPP.2017.18Dongarra J Hittinger J Bell J Applied Mathematics Research for Exascale Computing [Technical Report] Washington, DC 2014 https://science.energy.gov/~/media/ascr/pdf/research/am/docs/EMWGreport.pdfDuranton M De Bosschere K Cohen A Maebe J Munk H HiPEAC Vision 2015 https://www.hipeac.org/publications/vision/ 2015Lucas R Top Ten Exascale Research Challenges http://science.energy.gov/~/media/ascr/ascac/pdf/meetings/20140210/Top10reportFEB14.pdf 2014Lavignon JF ETP4HPC Strategic Research Agenda Achieving HPC Leadership in Europe 2013 http://www.etp4hpc.eu/Carson, E., & Higham, N. J. (2017). A New Analysis of Iterative Refinement and Its Application to Accurate Solution of Ill-Conditioned Sparse Linear Systems. SIAM Journal on Scientific Computing, 39(6), A2834-A2856. doi:10.1137/17m1122918Carson E Higham NJ Accelerating the solution of linear systems by iterative refinement in three precisions July 2017 http://eprints.ma.man.ac.uk/2562 SIAM Journal on Scientific ComputingShalf J The evolution of programming models in response to energy efficiency constraints October 2013 Norman, OK http://www.oscer.ou.edu/Symposium2013/oksupercompsymp2013_talk_shalf_20131002.pdfGolub, G. H., & Ye, Q. (1999). Inexact Preconditioned Conjugate Gradient Method with Inner-Outer Iteration. SIAM Journal on Scientific Computing, 21(4), 1305-1320. doi:10.1137/s1064827597323415Barrett, R., Berry, M., Chan, T. F., Demmel, J., Donato, J., Dongarra, J., … van der Vorst, H. (1994). Templates for the Solution of Linear Systems: Building Blocks for Iterative Methods. doi:10.1137/1.9781611971538Notay, Y. (2000). Flexible Conjugate Gradients. SIAM Journal on Scientific Computing, 22(4), 1444-1460. doi:10.1137/s1064827599362314Knyazev, A. V., & Lashuk, I. (2008). Steepest Descent and Conjugate Gradient Methods with Variable Preconditioning. SIAM Journal on Matrix Analysis and Applications, 29(4), 1267-1280. doi:10.1137/060675290CROZ, J. J. D., & HIGHAM, N. J. (1992). Stability of Methods for Matrix Inversion. IMA Journal of Numerical Analysis, 12(1), 1-19. doi:10.1093/imanum/12.1.1Higham, N. J. (2002). Accuracy and Stability of Numerical Algorithms. doi:10.1137/1.9780898718027Chow E Scott J On the use of iterative methods and blocking for solving sparse triangular systems in incomplete factorization preconditioning Swindon, UK Rutherford Appleton Laboratory 201
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The Influence of Lubricant Degradation on Measured Piston Ring Film Thickness in a Fired Gasoline Reciprocating Engine
YesA laser induced fluorescence system has been developed to visualise the oil film thickness between
the piston ring and cylinder wall of a fired gasoline engine via a small optical window mounted in the
cylinder wall. A fluorescent dye was added to the lubricant in the sump to allow the lubricant to
fluoresce when absorbing laser radiation. The concentration of the dye did not disturb the lubricant
chemistry or its performance. Degraded engine oil samples were used to investigate the influence of
lubricant quality on ring pack lubricant film thickness measurements. The results show significant
differences in the lubricant film thickness profiles for the ring pack when the lubricant degrades which
will affect ring pack friction and ultimately fuel economy
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