In this paper we give insight into the performance of Dynamic Spectrum Access Networks (DSAN), analyzing Quality of Detection of Primary User (PU) and DSAN blocking probability, when the channel is under the effect of log-normal shadowing. Specifically we propose a distributed power conserving PU detection architecture and investigate the impact of PU detection accuracy on DSAN performance. We ...

We present a new protocol that is based on consecutive, synchronous transmissions. By aligning transmissions based on timeouts, the protocol becomes more resilient to interference. We propose two methods to mitigate the effect of less accurate temporal packet alignment, namely time synchronization and random transmit powers.

The dynamics of human running can be modeled as a simple spring-mass system (McMahon and Cheng, 1990; Blickhan 1989). This model is highly robust in its ability to describe the dynamics of bouncing gaits in animals with 2, 4, 6, or even 8 legs (Blickhan and Full, 1993; Cavagna, G.A. et al., 1977). Independent studies have shown that one-legged and two-legged hopping both exhibit linear relation...

In this paper we provide a combinatorial framework for analysing the performance of frequency hopping sequences in a multiple access system in the presence of a communication jammer. We examine the resilience of a scheme based on Latin squares which achieves maximum throughput and propose further schemes with the same throughput but better resilience. We also consider the parameters and trade-o...

X. J. Chen, C. L. Zhang, J. S. Gardner, J. L. Sarrao, and C. C. Almasan Department of Physics, Kent State University, Kent, Ohio 44242, USA Physics Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USA NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-8562, USA MST-10, Los Alamos National Laboratory, Los Alamos, ...

We study the existence and stability of heteroclinic connections near “hopping” cellular flame patterns. These are dynamic patterns in which individual cells make sequential, and abrupt, changes in their angular positions while they rotate nonuniformly about the center of a circular domain. Normal form analysis and experimental works have shown that these patterns are associated with a homoclin...

We expand on a previous study of fronts in finite particle number reaction-diffusion systems in the presence of a reaction rate gradient in the direction of the front motion. We study the system via reaction-diffusion equations, using the expedient of a cutoff in the reaction rate below some critical density to capture the essential role of fluctuations in the system. For large density, the vel...

To promote more productive combinatorial endeavors, the Diversity Space methodology introduced here enables similarity comparisons at the library level. Particularly at an early screening stage, when little or no information is available regarding the pharmacophoric entities necessary for binding, it is more efficient to select or discard an entire ensemble of molecules at once, rather than foc...