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22 results on '"Coley, Christopher"'

1. A geometric multigrid method for isogeometric compatible discretizations of the generalized Stokes and Oseen problems

Author

Coley, Christopher, Benzaken, Joseph, and Evans, John A.

Subjects
Mathematics - Numerical Analysis
Abstract

In this paper, we present a geometric multigrid methodology for the solution of matrix systems associated with isogeometric compatible discretizations of the generalized Stokes and Oseen problems. The methodology provably yields a pointwise divergence-free velocity field independent of the number of pre-smoothing steps, post-smoothing steps, grid levels, or cycles in a V-cycle implementation. The methodology relies upon Scwharz-style smoothers in conjunction with specially defined overlapping subdomains that respect the underlying topological structure of the generalized Stokes and Oseen problems. Numerical results in both two- and three-dimensions demonstrate the robustness of the methodology through the invariance of convergence rates with respect to grid resolution and flow parameters for the generalized Stokes problem as well as the generalized Oseen problem provided it is not advection-dominated.

Published
2017

2. Variational Multiscale Modeling with Discontinuous Subscales: Analysis and Application to Scalar Transport

Author

Coley, Christopher and Evans, John A.

Subjects
Mathematics - Numerical Analysis
Abstract

We examine a variational multiscale method in which the unresolved fine-scales are approximated element-wise using a discontinuous Galerkin method. We establish stability and convergence results for the methodology as applied to the scalar transport problem, and we prove that the method exhibits optimal convergence rates in the SUPG norm and is robust with respect to the Peclet number if the discontinuous subscale approximation space is sufficiently rich. We apply the method to isogeometric NURBS discretizations of steady and unsteady transport problems, and the corresponding numerical results demonstrate that the method is stable and accurate in the advective limit even when low-order discontinuous subscale approximations are employed.

Published
2017

9. Design and Implementation of an Application and Associated Services to Support Interdisciplinary Medication Reconciliation Efforts at an Integrated Healthcare Delivery Network

Author

Poon, Eric G., Blumenfeld, Barry, Hamann, Claus, Turchin, Alexander, Graydon-Baker, Erin, McCarthy, Patricia C., Poikonen, John, Mar, Perry, Schnipper, Jeffrey L., Hallisey, Robert K., Smith, Sandra, McCormack, Christine, Paterno, Marilyn, Coley, Christopher M., Karson, Andrew, Chueh, Henry C., Van Putten, Cheryl, Millar, Sally G., Clapp, Margaret, Bhan, Ishir, Meyer, Gregg S., Gandhi, Tejal K., and Broverman, Carol A.

Published
2006
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14. Analysis of Daily Laboratory Orders at a Large Urban Academic Center: A Multifaceted Approach to Changing Test Ordering Patterns

Author

Rudolf, Joseph W., Dighe, Anand S., Coley, Christopher M., Kamis, Irina K., Wertheim, Bradley M., Wright, Douglas E., Lewandrowski, Kent B., and Baron, Jason M.

Subjects
Academic Medical Centers, Diagnostic Tests, Routine, Humans, Original Articles, Practice Patterns, Physicians', Unnecessary Procedures, Decision Support Systems, Clinical, Laboratories, Hospital, Medical Order Entry Systems
Abstract

We sought to address concerns regarding recurring inpatient laboratory test order practices (daily laboratory tests) through a multifaceted approach to changing ordering patterns.We engaged in an interdepartmental collaboration to foster mindful test ordering through clinical policy creation, electronic clinical decision support, and continuous auditing and feedback.Annualized daily order volumes decreased from approximately 25,000 to 10,000 during a 33-month postintervention review. This represented a significant change from preintervention order volumes (95% confidence interval, 0.61-0.64; P10-16). Total inpatient test volumes were not affected.Durable changes to inpatient order practices can be achieved through a collaborative approach to utilization management that includes shared responsibility for establishing clinical guidelines and electronic decision support. Our experience suggests auditing and continued feedback are additional crucial components to changing ordering behavior. Curtailing daily orders alone may not be a sufficient strategy to reduce in-laboratory costs.

Published
2017

16. An Investigation of Cavity Resonance and its Relationship to Store Force and Moment Loading

Author

AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF AERONAUTICS AND ASTRONAUTICS, Coley, Christopher J., AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF AERONAUTICS AND ASTRONAUTICS, and Coley, Christopher J.

Abstract

A store which is released from an internal bay is subjected to a highly unsteady flowfield which influences the release characteristics for the store. Pressure transducer information is often used to estimate store loading, although no direct correlation between the observed frequencies from the pressure transducers and the store loading has been developed. The relationship between the acoustic modes present in the cavity and the force and moment loading on a store released from a bay are investigated through a CFD study using the OVERFLOW 2.1 solver. The acoustic modes of the cavity are calculated from the pressure fluctuation histories along the cavity ceiling and walls. Empty cavity solutions are compared to the frequencies predicted by the Rossiter equation and to experimental data from the WICS database. Additionally, the cavity pressure fluctuation spectra are compared to the force and moment loading spectra for a store located in the cavity in both the carriage position and the shear layer. It is determined that the presence of a store in the cavity does not alter the fundamental acoustic modes in the cavity. Also, the store force and moment loadings are observed to correlate with the cavity pressure fluctuations., The original document contains color images.

Published
2011

22. Designing an electronic medication reconciliation system.

Author

Hamann C, Poon E, Smith S, Coley C, Graydon-Baker E, Gandhi T, Chueh HC, Poikonen J, Hallisey RK Jr, Van Putten C, Broverman C, Blumenfeld B, and Middleton B

Subjects
Hospitalization, Humans, Medical Records Systems, Computerized, Medication Systems, Hospital organization & administration
Abstract

Unintended medication discrepancies at hospital admission and discharge potentially harm patients. Explicit medication reconciliation (MR) can prevent unintended discrepancies among care settings and is mandated by JCAHO for 2005. Enterprise-wide, we are linking pre-admission and discharge medication lists in our outpatient electronic health records (EHR) with our inpatient order entry applications (OE) - currently not interoperable - to support MR and inform the development of comprehensive MR among hospitalized patients.

Published
2005

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