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Search Results: 1 - 10 of 128946 matches for " Liu Y "
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Can public report cards affect consumer’s private learning of quality? An evaluation of the impact of Florida hospital report cards on acute myocardial infarction patient admission patterns  [PDF]
Vivian Y. Wu, Pai Liu
Health (Health) , 2013, DOI: 10.4236/health.2013.512297

The empirical literature on hospital report cards typically assumes that report card cannot interact with consumer’s private learning. This study examines the impact of the implementation of FL hospital quality reporting system in late 2004 on hospital admission patterns using a pre-post difference-in-difference design. The estimation model allows for the possibility that report-card learning may interact with non-report-card learning. The study sample is comprised of all patients admitted to any FL hospital between 2000 and 2008 with a principal diagnosis of acute myocardial infarction (AMI). We find that hospital admission patterns for AMI patients did not respond to report card information. However, we find evidence consistent with the possibility that the implementation of a report card system may stimulate consumers (either patients or physicians) to seek higher quality hospitals through private information channels.


Coronal magnetic fields inferred from IR wavelength and comparison with EUV observations
Y. Liu
Annales Geophysicae (ANGEO) , 2009,
Abstract: Spectropolarimetry using IR wavelength of 1075 nm has been proved to be a powerful tool for directly mapping solar coronal magnetic fields including transverse component directions and line-of-sight component intensities. Solar tomography, or stereoscopy based on EUV observations, can supply 3-D information for some magnetic field lines in bright EUV loops. In a previous paper \citep{liu08} the locations of the IR emission sources in the 3-D coordinate system were inferred from the comparison between the polarization data and the potential-field-source-surface (PFSS) model, for one of five west limb regions in the corona (Lin et al., 2004). The paper shows that the region with the loop system in the active region over the photospheric area with strong magnetic field intensity is the region with a dominant contribution to the observed Stokes signals. So, the inversion of the measured Stokes parameters could be done assuming that most of the signals come from a relatively thin layer over the area with a large photospheric magnetic field strength. Here, the five limb coronal regions are studied together in order to study the spatial correlation between the bright EUV loop features and the inferred IR emission sources. It is found that, for the coronal regions above the stronger photospheric magnetic fields, the locations of the IR emission sources are closer to or more consistent with the bright EUV loop locations than those above weaker photospheric fields. This result suggests that the structures of the coronal magnetic fields observed at IR and EUV wavelengths may be different when weak magnetic fields present there.
Mode conversion enhancement between silicon micro-slab and plasmonic nano-gap waveguides
Y. Liu,Y. Lai
Physics , 2012,
Abstract: We investigate a short (~1.5{\mu}m) partially-corrugated tapered waveguide structure for mode coupling from a silicon micro-slab to a plasmonic nano-gap waveguide at the optical communication frequency. More than 80% transmission efficiency is reported numerically for the first time. The result indicates that the corrugated waveguide structure should not only be helpful for realizing full on-chip silicon plasmonic devices but also a good choice for mode coupling enhancement from dielectric waveguides to plasmonic waveguides. Meanwhile, we point out that the coupling mechanism reported here is different from that achieved by exciting surface plasmon polaritions (SPPs) at metal surfaces reported in [17] and [18].
Analysis for Pull-In Voltage of a Multilayered Micro-Bridge Driven by Electrostatic Force  [PDF]
Engineering (ENG) , 2010, DOI: 10.4236/eng.2010.21007
Abstract: A trial solution for bending deflection of a multilayered micro-bridge subject to a voltage induced load is presented. The relation between the applied voltage and the displacements of the micro-bridge in the pull-in state is analyzed by energy method. Furthermore, two analytical expressions about normalized displacement and pull-in voltage are carried out. It’s proved that the value of normalized displacement is not influenced by residual stress if axial and shear deformation is ignored. Finally, the theoretical results are compared with that of FEM, and they show good agreement.
Theoretic and Numerical Study of a New Chaotic System  [PDF]
C.X. Zhu, Y.H. Liu, Y. Guo
Intelligent Information Management (IIM) , 2010, DOI: 10.4236/iim.2010.22013
Abstract: This paper introduced a new three-dimensional continuous quadratic autonomous chaotic system, modified from the Lorenz system, in which each equation contains a single quadratic cross-product term, which is different from the Lorenz system and other existing systems. Basic properties of the new system are analyzed by means of Lyapunov exponent spectrum, Poincaré mapping, fractal dimension, power spectrum and chaotic behaviors. Furthermore, the forming mechanism of its compound structure obtained by merging together two simple attractors after performing one mirror operation has been investigated by detailed nu-merical as well as theoretical analysis. Analysis results show that this system has complex dynamics with some interesting characteristics.
Medical Stakeholders’ Views on the Use of Packaged Charging Based on the Diagnosis-Related Group (DRG) in the Proposed Healthcare Reform  [PDF]
Fiona Y. Y. Wong, Frank W. K. Chan, Su Liu
Journal of Service Science and Management (JSSM) , 2013, DOI: 10.4236/jssm.2013.65032

The second stage consultation of healthcare reform in Hong Kong was launched in late 2010. One of the key features in the healthcare reform is the use of packaged charging based on Diagnosis-Related Group (DRG) structure, for reimbursement of medical fees in order to enhance cost certainty and transparency in private healthcare services. The objective of the study was to investigate the comments, concerns and suggestions of medical practitioners and private hospitals about medical pricing based on DRG. A survey completed by 1100 medical practitioners, seven focus groups with 42 medical practitioners and six hospital administrators participated was conducted. Generally, the participants believed that DRG was more applicable to straight-forward and one-off treatment procedures. Those working in the private sector and non-Family Medicine specialists were more concerned about the desirability and feasibility of DRG, and the potential of control of pricing in private market. The practice of DRG-based pricing method in certain specialties and cases which required multiple examinations and procedures for diagnosis were discussed. Concerns about doctors’ selection of cases, upcoding and gaming on the charging system, as well as the high administration cost were also raised.

$L^p-L^q$ estimates on the solutions to $u_{tt}-u_{x_1x_1}=\triangle u_t$
Y. -Q. Liu,Y. Zhou
Mathematics , 2008,
Abstract: This paper focuses the study on the $L^p-L^q$ estimates on the solutions to an asymmetric wave equation with dissipation which arises in the study for the magneto-hydrodynamics by using the method of Green function.
Sequence Characterization and Expression Pattern of the Capra hircus (Goat) RAB14, RB11b and SOD3 Genes
G.Y. Liu
Journal of Animal and Veterinary Advances , 2012, DOI: 10.3923/javaa.2011.262.268
Abstract: The complete CDS sequences of three goat genes-goat RAB14, RB11B and SOD3 were amplified using RT-PCR. Sequence analysis of these three genes revealed that the goat RAB14 gene encodes a protein of 215 amino acids and has high homology with the Ras-related protein Rab-14 (..RAB14) of seven species-rat and pig (100%) human, mouse, chicken and orangutan (99%), dictyostelium discoideum (71%). The goat RB1B gene encodes a protein of 218 amino acids and has high homology with the Ras-related protein Rab-11B (RB11B) of five species-human, rat and bovine (99%), mouse (98%), electric ray (97%). The goat SOD3 has high homology with the superoxide dismutase 3, extracellular (SOD3) of four species-rabbit (74%), human (74%), rat (61%) and mouse (60%). The phylogenetic tree analysis revealed that the goat RAB14 gene has a closer genetic relationship with the RAB14 gene of rat and pig and the goat RB1B gene has a closer genetic relationship with the RB11B of human, rat and bovine. The goat SOD3 gene has a closer genetic relationship with the SOD3 of rabbit. The gene expression profile analysis indicated that the goat RAB14, RB11B and SOD3 genes were differentially expressed in tissues including ovary, pituitary, muscle, kidney, heart, lung, liver and spleen. The experiment established the primary foundation for further research on these three goat genes.
A computationally-efficient secondary organic aerosol module for three-dimensional air quality models
P. Liu ,Y. Zhang
Atmospheric Chemistry and Physics (ACP) & Discussions (ACPD) , 2008,
Abstract: Accurately simulating secondary organic aerosols (SOA) in three-dimensional (3-D) air quality models is challenging due to the complexity of the physics and chemistry involved and the high computational demand required. A computationally-efficient yet accurate SOA module is necessary in 3-D applications for long-term simulations and real-time air quality forecasting. A coupled gas and aerosol box model (i.e., 0-D CMAQ-MADRID 2) is used to optimize relevant processes in order to develop such a SOA module. Solving the partitioning equations for condensable volatile organic compounds (VOCs) and calculating their activity coefficients in the multicomponent mixtures are identified to be the most computationally-expensive processes. The two processes can be speeded up by relaxing the error tolerance levels and reducing the maximum number of iterations of the numerical solver for the partitioning equations for organic species; conditionally activating organic-inorganic interactions; and parameterizing the calculation of activity coefficients for organic mixtures in the hydrophilic module. The optimal speed-up method can reduce the total CPU cost by up to a factor of 31.4 from benchmark under the rural conditions with 2 ppb isoprene and by factors of 10–71 under various test conditions with 2–10 ppb isoprene and >40% relative humidity while maintaining ±15% deviation. These speed-up methods are applicable to other SOA modules that are based on partitioning theories.
Tafluprost once daily for treatment of elevated intraocular pressure in patients with open-angle glaucoma
Liu Y, Mao W
Clinical Ophthalmology , 2013, DOI: http://dx.doi.org/10.2147/OPTH.S30951
Abstract: fluprost once daily for treatment of elevated intraocular pressure in patients with open-angle glaucoma Review (1747) Total Article Views Authors: Liu Y, Mao W Published Date December 2012 Volume 2013:7 Pages 7 - 14 DOI: http://dx.doi.org/10.2147/OPTH.S30951 Received: 11 October 2012 Accepted: 20 November 2012 Published: 21 December 2012 Yang Liu, Weiming Mao Department of Cell Biology and Anatomy, North Texas Eye Research Institute, University of North Texas Health Science Center, Fort Worth, TX Abstract: Glaucoma is a leading cause of visual loss worldwide. Current antiglaucoma therapy focuses on lowering intraocular pressure to a safe level. In recent years, prostaglandin analogs have become the first-line agents for treating open angle glaucoma. Tafluprost, which was first reported in 2003, is a novel prostaglandin analog, and has been shown to be a potent ocular hypotensive agent in a number of preclinical and clinical studies. Also, its unique preservative-free formulation helps to decrease preservative-associated ocular disorders and improve patient compliance. In this review, studies from 2003 to 2012 focusing on the structure, metabolism, efficacy, and safety of tafluprost are summarized. These studies suggested that application of tafluprost once daily is a safe and effective treatment for patients with open angle glaucoma.
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