A hierarchical quasi-Helmholtz decomposition, originally developed to address the dense-discretization breakdowns for the electric field integral equation, is applied together with an algebraic ...preconditioner to improve the convergence of the combined field integral equation in multiscale problems. The effectiveness of the proposed method is studied first on some simple examples; next, tests on real-life cases up to several hundreds of wavelengths show its good performance.
Synchronization is deemed to play an important role in information processing in many neuronal systems. In this work, using a well known technique due to Pecora and Carroll, we investigate the ...existence of a synchronous state and the bifurcation diagram of a network of synaptically coupled neurons described by the Hindmarsh-Rose model. Through the analysis of the bifurcation diagram, the different dynamics of the possible synchronous states are evidenced. Furthermore, the influence of the topology on the synchronization properties of the network is shown through an example.
Hypersonic flight regime is conventionally defined for Mach> 5; in these conditions, the flying object becomes enveloped in a plasma. This plasma is densest in thin surface layers, but in typical ...situations of interest it impacts electromagnetic wave propagation in an electrically large volume. We address this problem with a hybrid approach. We employ Equivalence Theorem to separate the inhomogeneous plasma region from the surrounding free space via an equivalent (Huygens) surface, and the Eikonal approximation to Maxwell equations in the large inhomogeneous region for obtaining equivalent currents on the separating surface. Then, we obtain the scattered field via (exact) free space radiation of these surface equivalent currents. The method is extensively tested against reference results and then applied to a real-life re-entry vehicle with full 3D plasma computed via Computational Fluid Dynamic (CFD) simulations. We address both scattering (RCS) from the entire vehicle and radiation from the on-board antennas. From our results, significant radio link path losses can be associated with plasma spatial variations (gradients) and collisional losses, to an extent that matches well the usually perceived blackout in crossing layers in cutoff. Furthermore, we find good agreement with existing literature concerning significant alterations of the radar response (RCS) due to the plasma envelope.
An interpolation procedure to approximate the electromagnetic responses of structures for different values of some parameters describing the structures geometry is presented. Basis functions are ...obtained from known families (e.g. polynomials or trigonometric polynomials) and from a post-process of some actual responses of the system. The fitting, in the least squares sense, can be handled efficiently leveraging on the Kronecker form of the resulting linear system.
BACKGROUND:A multidisciplinary, multifaceted approach to disease management that incorporates the health system, the provider, and the patient is supported in the literature. There was a need to ...improve patient outcomes to meet or to exceed the Health Plan Employer Data and Information Set (HEDIS) benchmarks for the management of patients with diabetes.
OBJECTIVES:The purpose of this study was to implement a process improvement effort using practice guidelines on the basis of an evidence-based practice model for the management of type II diabetes mellitus at two primary care clinics at two military medical facilities in Hawaii.
METHODS:A retrospective review of charts, electronic records, and system data revealed that the clinics used as project sites were not compliant with established guidelines for diabetes management. After a literature review and an analysis of the current processes, a multidisciplinary care delivery model was developed and implemented to identify spheres of influence involving all members of the diabetes management team and the tasks that influenced patient outcomes.
RESULTS:Improvements were seen for more than 6 months of initial practice change, including compliance with annual glycosylated hemoglobin (HbA1c), lipid, blood pressure, and foot checks. At Site 1, HEDIS measures increased for adequately controlled HbA1c and low-density lipoprotein (LDL) from 80% to 85% and from 49% to 58%, respectively. Site 2 showed an increase in adequate control of HbA1c from 77% to 79% at 6 months. After a steady increase in compliance, the percentage for adequately controlled LDL dropped to 56% at 9 months. At Site 1, HEDIS measures decreased slightly to 82% for HbA1c control and to 54% for LDL control at the 9-month mark.
DISCUSSION:Inconsistent delivery of care and lack of staff and patient involvement influenced process outcomes. There were challenges with database accuracy, adequate staffing, computer software upgrades, and overseas site locations. Annual foot examinations showed the largest improvement over time. Site 1 had a significant increase in filament testing because of an innovative strategy to develop a competency program to educate technicians to perform the assessment during the patient check-in process. Sustainability is needed to improve overall patient quality and patient safety and to decrease variation in care among medical treatment facilities over time.
We present some preliminary results on the construction of a Reduced Order Model to simulate the electromagnetic response of a structure at different frequencies with Surface Integral Equations. The ...Discrete Empirical Interpolation Method, introduced for the simulation of nonlinear differential equations, is used in this context to accelerate the construction of the Reduced Order Model.
This work presents a fast analysis of electromagnetic scattering from arrays of metallic nano-particles with aperiodic spiral order. The reported method extends the integral equation fast Fourier ...transform (IE-FFT) algorithm to the method of moments solution of PMCHWT integral equation for aperiodic homogenous dielectric arrays. The algorithm relies on the interpolation of Greens function by Lagrangian polynomials on a uniform Cartesian grid. Hence, the matrix-vector product in the iterative solver can be computed via the fast Fourier transform. The memory requirement and the computational complexity of the algorithm tend to stay close to O(N) and O(NlogN), respectively, where N is the number of unknowns. Some numerical examples are included, which illustrate the accuracy and capability of the present method.
This paper presents a new domain decomposition scheme for the analysis of structures in the Method of Moments context. The method is flexible in the sense that it allows the decomposition of complex ...structures according to the user needs, admitting tearing apart the structure into closed, open or closed-open portions (e.g. subdomains) without any limitation. Moreover, the use of Discontinuous Galerkin to enforce transmission conditions among the subdomains, permits both conformal/Non-conformal discretizations, decreasing in great manner the mesher burden, as for each subdomain can be discretized independently.
Some numerical results about the use of a Reduced Order Model to map currents to their radiated field in the presence of a scatterer are shown for antenna design and placement.
Synchronization is deemed to play an important role in information processing in many neuronal systems. In this work, using a well known technique due to Pecora and Carroll, we investigate the ...existence of a synchronous state and the bifurcation diagram of a network of synaptically coupled neurons described by the Hindmarsh-Rose model. Through the analysis of the bifurcation diagram, the different dynamics of the possible synchronous states are evidenced. Furthermore, the influence of the topology on the synchronization properties of the network is shown through an example.
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