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Surface Diffusion Flow Near Spheres, Glen Wheeler
Surface Diffusion Flow Near Spheres, Glen Wheeler
Faculty of Informatics - Papers (Archive)
We consider closed immersed hypersurfaces evolving by surface diffusion flow, and perform an analysis based on local and global integral estimates. First we show that a properly immersed stationary (ΔH ≡ 0) hypersurface in R3 or R4 with restricted growth of the curvature at infinity and small total tracefree curvature must be an embedded union of umbilic hypersurfaces. Then we prove for surfaces that if the L2 norm of the tracefree curvature is globally initially small it is monotonic nonincreasing along the flow.We also derive pointwise estimates for all derivatives of the curvature assuming that its L …
Anisotropic Coupled Diffusion Filter And Binarization For The Electronic Speckle Pattern Interferometry Fringes, Fang Zhang, Zhitao Xiao, Jun Wu, Lei Geng, Hongqiang Li, Jiangtao Xi, Jin Jiang Wang
Anisotropic Coupled Diffusion Filter And Binarization For The Electronic Speckle Pattern Interferometry Fringes, Fang Zhang, Zhitao Xiao, Jun Wu, Lei Geng, Hongqiang Li, Jiangtao Xi, Jin Jiang Wang
Faculty of Informatics - Papers (Archive)
In this paper novel approaches based on anisotropic coupled diffusion equations are presented to do filter and binarization for ESPI fringes. An advantageous characteristic associated with the proposed technique is that diffusion takes place mainly along the direction of the edge. Therefore, the proposed anisotropic coupled diffusion filter method can avoid blur of the fringe edge and protect the useful information of the fringe patterns. The anisotropic coupled diffusion binarization, which can repair the image boundary anisotropically, is able to avoid the redundant burr. More important, it can be directly applied to the noisy ESPI fringe patterns without much preprocessing, …
Drug Diffusion From Polymeric Delivery Devices: A Problem With Two Moving Boundaries, Mike Hsieh, Scott Mccue, Timothy J. Moroney, Mark I. Nelson
Drug Diffusion From Polymeric Delivery Devices: A Problem With Two Moving Boundaries, Mike Hsieh, Scott Mccue, Timothy J. Moroney, Mark I. Nelson
Faculty of Informatics - Papers (Archive)
An existing model for solvent penetration and drug release from a spherically shaped polymeric drug delivery device is revisited. The model has two moving boundaries, one that describes the interface between the glassy and rubbery states of the polymer, and another that defines the interface between the polymer ball and the pool of solvent. The model is extended so that the nonlinear diffusion coefficient of drug explicitly depends on the concentration of solvent, and the resulting equations are solved numerically using a front fixing transformation together with a finite difference spatial discretisation and the method of lines. We present evidence …
Asymptotic And Numerical Results For A Model Of Solvent-Dependent Drug Diffusion Through Polymeric Spheres, Scott Mccue, Mike Hsieh, Timothy J. Moroney, Mark I. Nelson
Asymptotic And Numerical Results For A Model Of Solvent-Dependent Drug Diffusion Through Polymeric Spheres, Scott Mccue, Mike Hsieh, Timothy J. Moroney, Mark I. Nelson
Faculty of Informatics - Papers (Archive)
A model for drug diffusion from a spherical polymeric drug delivery device is considered. The model contains two key features. The first is that solvent diffuses into the polymer, which then transitions from a glassy to a rubbery state. The interface between the two states of polymer is modeled as a moving boundary, whose speed is governed by a kinetic law; the same moving boundary problem arises in the one-phase limit of a Stefan problem with kinetic undercooling. The second feature is that drug diffuses only through the rubbery region, with a nonlinear diffusion coefficient that depends on the concentration …
Exploring Factors That Affect Teleconsultation Adoption: In The Case Of Malaysia, Nurazean Maarop, Khin Than Win, Maslin Masrom, Sukdershan Singh Hazara Singh
Exploring Factors That Affect Teleconsultation Adoption: In The Case Of Malaysia, Nurazean Maarop, Khin Than Win, Maslin Masrom, Sukdershan Singh Hazara Singh
Faculty of Informatics - Papers (Archive)
This study identifies the factors that could affect the adoption of teleconsultation technology in public hospitals in Malaysia from the qualitative standpoint. Based on theory-driven and prior-research approach, a conceptual framework was developed and used to facilitate the data collection and analysis processes. The underlying framework derived from a consideration of integrated model of established technology acceptance and diffusion theories and also findings of published telemedicine studies. Semi-structured interviews involving twenty eight key informants coupled with reviews of relevant documents were conducted within eleven participating hospitals to examine the key issues addressed in the framework which subsequently entailed thematic analysis. …
Lifespan Theorem For Simple Constrained Surface Diffusion Flows, Glen Wheeler
Lifespan Theorem For Simple Constrained Surface Diffusion Flows, Glen Wheeler
Faculty of Informatics - Papers (Archive)
We consider closed immersed hypersurfaces in R3 and R4 evolving by a special class of constrainedsurfacediffusionflows. This class of constrainedflows includes the classical surfacediffusionflow. In this paper we present a LifespanTheoremfor these flows, which gives a positive lower bound on the time for which a smooth solution exists, and a small upper bound on the total curvature during this time. The hypothesis of the theorem is that the surface is not already singular in terms of concentration of curvature. This turns out to be a deep property of the initial manifold, as the lower bound on maximal time obtained depends …
Privacy, Value And Control Issues In Four Mobile Business Applications, Benjamin D. Renegar, Katina Michael, M G. Michael
Privacy, Value And Control Issues In Four Mobile Business Applications, Benjamin D. Renegar, Katina Michael, M G. Michael
Faculty of Informatics - Papers (Archive)
This paper presents four case studies that explore the adoption and acceptance of mobile technologies and services within the context of the privacy-value-control (PVC) trichotomy. The technologies studied include: the mobile phone, electronic toll payment tags, e-passports, and loyalty card programs. The study shows that despite the potential barriers to adoption in each of the depicted cases, the applications were embraced with great success soon after their introduction. An understanding of why these mobile innovations succeeded in spite of the concerns surrounding them will serve to help practitioners understand other issues currently plaguing emerging technologies like radio-frequency identification (RFID) tags …