We have addressed in this paper the implementation of redblack multigrid smoothers on high-end microprocessors. Most of the previous work about this topic has been focused on cache memory issues due to its tremendous impact on performance. In this paper, we have extended these studies taking Simultaneous Multithreading (SMT ) into account. With the introduction of SMT, new possibilities arise, ...

PURPOSE   The aim was to assess visual performance after PureVision high addition multifocal contact lens (PM) fitting through contrast sensitivity measured under different illumination levels for both distance and near. METHODS   In a cross-over study, 20 presbyopic patients were randomly assigned to PM or spectacles. Near contrast sensitivity was measured with the Vistech VCTS 6500 system. ...

In the Bluetooth system, isochronous applications, such as voice and audio, are carried by Synchronous Connection Oriented (SCO) links. SCO packets are regularly scheduled every two, four, or six time slots and enjoy preemptive priority over data-bearing Asynchronous Connection-Less (ACL) packets. The residual bandwidth available to simultaneous data services is often insufficient for many type...

Simultaneous multithreading (SMT) is an approach to address the well-known problems of memory accesses increasingly dominating processor execution time and of limited instruction level parallelism. Previous research has explored the benefits and limitations of SMT based on specific processor architectures under a variety of workloads. In this paper, we present a performance analysis of SMT in a...

In Simultaneous Multi-Threaded (SMT) processor datapaths, there are many datapath resources that are shared by multiple threads. Currently, there are a few heuristics that distribute these resources among threads for better performance. A selection hyper-heuristic is a search method which mixes a fixed set of heuristics to exploit their strengths while solving a given problem. In this study, we...

In this paper we study the time evolution of the position estimates’ covariance in Cooperative Simultaneous Localization and Mapping (C-SLAM), and obtain analytical upper bounds for the positioning uncertainty. The derived bounds provide descriptions of the asymptotic positioning performance of a team of robots in a mapping task, as a function of the characteristics of the proprioceptive and ex...

TZVETELINA (LINA) BATTESTILLI Performance Analysis of Optical Burst Switched Networks with Dynamic Simultaneous Link Possession. (Under the direction of Professor HARRY G. PERROS). Given the current state of the technology, the Optical Burst Switched (OBS) network is the most practical all-optical architecture. The user data is transmitted in variable size data packets, called bursts, which tra...

Hydrodynamic conditions can influence the distribution and abundance of aquatic species in many ways, including directly through disturbance and resource delivery, and indirectly by altering environmental cues and species interactions. In coral reef ecosystems, corallivory is an important top-down control of coral populations, while water motion can enhance coral performance via autotrophic and...