The priority queueing mechanism is analysed to verify its effectiveness when applied for the support of Expedited Forwarding-based services in the Di erentiated Services environment. An experimental measurement-based methodology is adopted to outline its properties and end-to-end performance when supported in real transmission devices. A test layout has been set up over a metropolitan area for ...

We consider factors not only in a packet, but also in its locality, to account for possible temporal and spatial masking effects. We apply our visibility model to packet priority for a video stream, when the network gets jam-packed at an in-between router; the router is able to choose which packets to drop such that visual quality of the video is minimally crashed. To show the effectiveness of ...

This paper considers an MIG/c queueing system serving a finite number (J) of distinct customer classes. Performance of the system, as measured by the vector of steady-state xpected waiting times of the customer classes (the performance vector), may be controlled by adopting an appropriate priority discipline. We show that the performance space, the set of performance vectors which are achievabl...

BACKGROUND The Veterans Health Administration (VHA) has introduced an integrated electronic medical record, performance measurement, and other system changes directed at improving care. Recent comparisons with other delivery systems have been limited to a small set of indicators. OBJECTIVE To compare the quality of VHA care with that of care in a national sample by using a comprehensive quali...

The research issues in the assessment of quality of health care have not changed significantly during the past 20 years. What was changed is the increased interest among providers, consumers, and policymakers for ways to measure and compare quality among providers. Clearly there is an increased sense of urgency in the need for research in such areas as the development of improved measures of ph...

In previous work, the main interfering background for the in vivo lead in bone measurement was found to be from back-scattered Compton and Rayleigh source photons, which is, therefore, also the main problem for the improvement of sensitivity. Based on the physics of atomic transition, certain fractions of the characteristic K-series X-rays and L-series X-rays are in true coincidence. With an ad...

This paper investigates the effect of changing priority bonuses of Inter-Core Aggregation Scheduler (IAS). IAS is a kernellevel thread scheduler for commodity Chip Multi-Processing (CMP) platforms. To utilize a shared cache and memory on a CMP platform to enhance the performance, IAS executes sibling threads, kernel-level threads sharing the same memory address space, simultaneously on differen...