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Search Results: 1 - 10 of 191345 matches for " D. Bick "
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Reducing hospital inpatient complications: A four year experience  [PDF]
Ronald Lagoe, Joseph Bick
Advances in Bioscience and Biotechnology (ABB) , 2013, DOI: 10.4236/abb.2013.41A017
Abstract:

This study described the use of administrative data and a computer software algorithm, Potentially Preventable Complications, to support reduction of inpatient hospital complications. The study was carried out between 2008 and2012 inSt. Joseph’s Hospital Health Center in Syracuse, New York. The hospital generates approximately 23,000 inpatient discharges annually. The study employed summary tables for individual inpatient complications and patient specific spreadsheets to evaluate and follow adverse outcomes. The spreadsheets were employed by hospital staff to determine whether patient medical records confirm each complication identified by the software. This process resulted in improvement of the accuracy of administrative data describing inpatient complications. The administrative data and the software were also used in conjunction with medical records to Identify patients who received program interventions and still experienced inpatient complications. This process enabled hospital staff to ensure that interventions were being provided and evaluate their effecttiveness. The study demonstrated that, at the aggregate level, the inpatient complication rate per 1000 discharges declined by 33.4 percent, from 56.11 to 37.37 between 2008 and 2011. The principal drivers of this decline were high volume complications such as pneumonia, where the rate declined by 45.7 percent and urinary tract infection where the rate declined by 23.7 percent. The project provided a means of communicating and managing outcomes data that could be implemented and understood by a wide range of health care providers.

Wetting of crossed fibers: multiple steady states and symmetry breaking
Alban Sauret,Alison D. Bick,Camille Duprat,Howard A. Stone
Physics , 2014, DOI: 10.1209/0295-5075/105/56006
Abstract: We investigate the wetting properties of the simplest element of an array of random fibers: two rigid fibers crossing with an inclination angle and in contact with a droplet of a perfectly wetting liquid. We show experimentally that the liquid adopts different morphologies when the inclination angle is increased: a column shape, a mixed morphology state where a drop lies at the end of a column, or a drop centered at the node. An analytical model is provided that predicts the wetting length as well as the presence of a non-symmetric state in the mixed morphology regime. The model also highlights a symmetry breaking at the transition between the column state and the mixed morphology. The possibility to tune the morphology of the liquid could have important implications for drying processes.
Isotropy of Frequencies and Weak Chimeras With Broken Symmetry
Christian Bick
Physics , 2015,
Abstract: The notion of a weak chimeras provide a tractable definition for chimera states in networks of finitely many phase oscillators. Here we rephrase this definition in the language of equivariant dynamical systems: for coupled phase oscillators the notion of a weak chimera can be cast in terms of the isotropy of the frequency vector-the average of the vector field along a trajectory. While dynamically invariant sets with symmetries are natural candidates for weak chimeras as nontrivial symmetry immediately implies frequency synchronization, we give a result for the existence of weak chimeras without instantaneous or setwise symmetries. In particular, we give an explicit example of a coupling function that gives rise to chaotic weak chimeras without symmetry in weakly coupled populations of phase oscillators with generalized coupling.
Symmetry breaking in the Hubbard model
Eike Bick
Physics , 2002,
Abstract: Almost all known high temperature superconductors are cuprates, which can be suitably modelled by the two dimensional Hubbard model. To understand the interplay of various long range properties as antiferromagnetism and superconductivity, one can calculate the phase diagram of the Hubbard model in the charge density-temperature plane. This analysis is conveniently carried out by means of exact renormalization group equations that we apply in the formalism of the effective average action. For this purpose, we derive an equivalent version of the Hubbard model that takes the form of a Yukawa theory. From this modified model long range order in various channels can be extracted by simple calculation of bosonic expectation values. We are able to reproduce the main features of the phase diagram of high temperature superconductors. Furthermore, our analysis shows how the Mermin-Wagner theorem can be reconciled with the existence of antiferromagnetic long range order at non vanishing temperature and how the inclusion of different kinds of bosonic fluctuations affect the phase diagram.
Asynchronous Networks and Event Driven Dynamics
Christian Bick,Michael Field
Physics , 2015,
Abstract: Real-world networks in physics, biology and technology often exhibit dynamics that cannot be adequately reproduced using network models given by smooth dynamical systems and a fixed network topology. Asynchronous networks give a theoretical and conceptual framework for the study of network dynamics where nodes can evolve independently of one another, be constrained, stop, and later restart, and where the interaction between different components of the network may depend on time, state, and stochastic effects. This framework is sufficiently general to encompass a wide range of applications ranging from engineering to neuroscience. Typically, dynamics is piecewise smooth and there are relationships with Filippov systems. We make the notion of a functional asynchronous network rigorous, discuss the phenomenon of dynamical locks, and present a theorem about the spatiotemporal factorization of the dynamics for a class of deadlock free functional asynchronous networks of feedforward type. We conclude with some examples and applications related to asynchronous networks with a stochastic connection structure.
Chaotic Weak Chimeras and their Persistence in Coupled Populations of Phase Oscillators
Christian Bick,Peter Ashwin
Physics , 2015,
Abstract: Nontrivial collective behavior may emerge from the interactive dynamics of many oscillatory units. Chimera states are chaotic patterns of spatially localized coherent and incoherent oscillations. The recently-introduced notion of a weak chimera gives a rigorously testable characterization of chimera states for finite-dimensional phase oscillator networks. In this paper we give some persistence results for dynamically invariant sets under perturbations and apply them to coupled populations of phase oscillators with generalized coupling. In contrast to the weak chimeras with nonpositive maximal Lyapunov exponents constructed so far, we show that weak chimeras that are chaotic can exist in the limit of vanishing coupling between coupled populations of phase oscillators. We present numerical evidence that positive Lyapunov exponents can persist for a positive measure set of this inter-population coupling strength.
Hospital inpatient complications and severity of illness  [PDF]
Ronald Lagoe, Anne Marie Czyz, Joseph Bick, Shelly Littau
Open Journal of Nursing (OJN) , 2013, DOI: 10.4236/ojn.2013.38A002
Abstract:

This study evaluated the severity of illness of patients experiencing inpatient hospital complications in two hospitals in the metropolitan area of Syracuse, New York. It involved identification of inpatient complications by All Patients Refined (APR) severity of illness for pneumonia, clostridium difficile colitis, and urinary tract infection. Severity of illness was identified for each patient at the time of admission. The study showed that patients at the two highest levels of severity of illness, Major and Extreme, accounted for 76-93 percent of those with the three complications evaluated. These patients comprised less than 40 percent of the inpatient populations of the hospitals. At the same time, the study showed that only 0-23 percent of patients at Minor or Moderate severity of illness experienced inpatient complications. These low severity of illness categories accounted for 60 percent or more of inpatients in the Syracuse hospitals. Results of the study suggested that efforts to reduce hospital inpatient complications could focus on those patients with high severity of illness. They also suggested that these efforts could largely avoid patients with low severity of illness and, as a result, save clinical and quality assurance resources in hospitals.

Controlling Chimeras
Christian Bick,Erik A. Martens
Physics , 2014, DOI: 10.1088/1367-2630/17/3/033030
Abstract: Coupled phase oscillators model a variety of dynamical phenomena in nature and technological applications. Non-local coupling gives rise to chimera states which are characterized by a distinct part of phase-synchronized oscillators while the remaining ones move incoherently. Here, we apply the idea of control to chimera states: using gradient dynamics to exploit drift of a chimera, it will attain any desired target position. Through control, chimera states become functionally relevant; for example, the controlled position of localized synchrony may encode information and perform computations. Since functional aspects are crucial in (neuro-)biology and technology, the localized synchronization of a chimera state becomes accessible to develop novel applications. Based on gradient dynamics, our control strategy applies to any suitable observable and can be generalized to arbitrary dimensions. Thus, the applicability of chimera control goes beyond chimera states in non-locally coupled systems.
A systematic review of the relationship between severe maternal morbidity and post-traumatic stress disorder
Marie Furuta, Jane Sandall, Debra Bick
BMC Pregnancy and Childbirth , 2012, DOI: 10.1186/1471-2393-12-125
Abstract: Relevant literature was identified through multiple databases, including MEDLINE, PsycINFO, EMBASE, CINAHL, British Nursing Index, Web of Science, Cochrane library and the British Library, using predetermined search strategies. The search terms included "post-traumatic stress disorder", "PTSD", "stress disorders, post-traumatic", "maternal morbidity", ?pregnancy complications? ?puerperal disorders?, "obstetric labo(u)r complication", "postpartum h(a)emorrhage", "eclampsia?. Studies identified were categorised according to pre-defined inclusion and exclusion criteria. The quality of included studies was assessed using the relevant CASP appraisal tools.Eleven primary studies met review criteria. Evidence of a relationship between severe maternal morbidity and PTSD/PTSD symptoms was inconsistent and findings varied between studies. Nevertheless, there is some evidence that severe pre-eclampsia is a risk factor for PTSD and its symptoms, an association possibly mediated by other factors such as fetal/neonatal condition.Despite the absence of robust evidence regarding the relationship between severe maternal morbidity and PTSD/PTSD symptoms, it is crucially important that clinicians and policy makers are aware of a potential higher risk of PTSD among women who experience severe morbidity. Further studies are now needed to confirm this risk as well as to understand underlying mechanisms in order to minimise the longer term psychiatric impact of severe maternal morbidity.
Antiferromagnetic gap in the Hubbard model
T. Baier,E. Bick,C. Wetterich
Physics , 2003, DOI: 10.1016/j.physletb.2004.11.022
Abstract: We compute the temperature dependence of the antiferromagnetic order parameter and the gap in the two dimensional Hubbard model at and close to half filling. Our approach is based on truncations of an exact functional renormalization group equation. The explicit use of composite bosonic degrees of freedom permits a direct investigation of the ordered low temperature phase. We show that the Mermin--Wagner theorem is not practically applicable for the spontaneous breaking of the continuous spin symmetry in the antiferromagnetic state. The critical behavior is dominated by the fluctuations of composite Goldstone bosons.
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