Health Information Technology Commons^™

Telemedicine: Discovering And Overcoming The Barriers, Dennis Mcclain-Furmanski

Community & Environmental Health Theses & Dissertations

Telemedicine is the use of teleconmrunications for medical diagnosis and patient care from a distance. This multimedia computer based medium serves as an aid to decision making, a means of transmission of care-related data and as a channel for collaborative care management between a provider and a patient. It is of greatest utility in remote areas, or in other cases where transportation of either provider or patient would be problematic or economically less feasible than the telemedicine alternative.

This study examined the current capabilities of the computer hardware and software necessary to implement a telemedicine system. It found that current …

Ultrasound Three- Dimensional Velocity Measurements By Feature Tracking, Gregory R. Bashford, Olaf T. Von Ramm

Biomedical Imaging and Biosignal Analysis Laboratory

This article describes a new angle-independent method suitable for three-dimensional (3-D) blood flow velocity measurement that tracks features of the ultrasonic speckle produced by a pulse echo system. In this method, a feature is identified and followed over time to detect motion. Other blood flow velocity measurement methods typically estimate velocity using one- (1-D) or two-dimensional (2-D) spatial and time information. Speckle decorrelation due to motion in the elevation dimension may hinder this estimate of the true 3-D blood flow velocity vector. Feature tracking is a 3-D method with the ability to measure the true blood velocity vector rather than …

Uwomj Volume 65, No 2, Spring 1996, Western University

University of Western Ontario Medical Journal

An interdisciplinary medical science publication, established in 1930.

A Lattice Boltzmann Subgrid Model For High Reynolds Number Flows, S. Hou, James D. Sterling, S. Chen, G. D. Doolen

Business and Information Technology Faculty Research & Creative Works

A sub grid turbulence model for the lattice Boltzmann method is proposed for high Reynolds number fluid flow applications. The method, based on the standard Smagorinsky sub grid model and a single-time relaxation lattice Boltzmann method, incorporates the advantages of the lattice Boltzmann method for handling arbitrary boundaries and is easily implemented on parallel machines. The method is applied to a two-dimensional driven cavity flow for studying dynamics and the Reynolds number dependence of the flow structures. The substitution of other sub grid models, such as the dynamic sub grid model, in the framework of the LB method is discussed.

Influence Of Formation Processes On Oblique Detonation Wave Stabilization, K. Ghorbanian, J. D. Sterling

Business and Information Technology Faculty Research & Creative Works

In this article we report steady, two-dimensional, inviscid solutions for the near field and far field of a supersonic reactive flow over a variable-double-ramp geometry. The incident shock wave compresses and heats the reactants that will combust after flowing some induction length. Upon reaction, a detonation wave forms and intersects the leading wave at some distance from the ramp surface. In this article, reaction-polar diagrams are developed, and the detonation branch solutions are used to investigate the wave interaction processes that may lead to a steady three-wave structure. By considering this formation process new oblique detonation wave stabilization criteria based …

Gas Dynamic Unstart In Superdetonative Ram Accelerators, Kaveh Ghorbanian, James D. Sterling

Business and Information Technology Faculty Research & Creative Works

In this paper we analyze the reflection of non-reacting shock waves as oblique detonation waves. The 2D, steady, inviscid analysis makes use of detonation polar diagrams to identify incident shock angles that lead to reflected detonations, with and without detonation Mach stem formation. The implications of the results for design and operation of superdetonative ram accelerators are explored. The influence of the projectile forebody geometry, the propellant composition, and the takeover velocity is described. We conclude with a discussion of the significance of these parameters on superdetonative ram accelerator unstart phenomena.

Enhanced Combustion Pulsejet Engines For Mach 0 To 3 Applications, J. Sterling, K. Ghorbanian, T. Sobota

Business and Information Technology Faculty Research & Creative Works

In this paper, we discuss the cyclic operation of an enhanced combustion pulsejet engine (ECPE) applicable in the Mach number range of 0 to 3. The geometry of this engine naturally provides for integration into a new combined cycle engine with ramjets. As in the operation of conventional pulsejets, an ECPE provides engine aspiration, charge compression, combustion and expansion without the use of turbomachinery. The use of modern electronics, fuel injection, and feedback control offers the potential for performance improvements that could make the ECPE a cost-effective competitor for the turbojet engine. This article describes the operating cycle of a …