We present a detail performance study of three main memory recovery algorithms: Levy and Silberschatz's Log-Driven Backups, Jagadish, Silberschatz and Sudarshan's Recovery from Main Memory Lapses, and Kumar's Partial Recovery through simulation modeling. Our results show that load balancing signiicantly aaects the performance, and group commit is an eeective way to reduce disk I/O operations in...

Practical M-FSK systems experience a combination of time and frequency offsets (errors). This paper assesses the deleterious effect ofthese offsets, first individually and then combined, on the average hit error probability performance ofthe system. Exact expressions for these various error prohability performances are derived and evaluated numerically for system parameters of interest. Also pr...

We provide a rigorous proof of granularity adjustment (GA) formulas to evaluate loss distributions and risk measures (value-at-risk) in the case of heterogenous portfolios, multiple systemic factors and random recoveries. As a significant improvement with respect to the literature, we detail all the technical conditions of validity and provide an upper bound of the remainder term at a finite di...

Wireless mesh networks (WMNs) are being developed actively and deployed widely for a variety of applications They have also been evolving in various forms to meet the increasing capacity demands. However during their lifetime, multi hop wireless mesh networks (WMNs) experience frequent link failures caused by channel interference, dynamic obstacles, and/or applications’ bandwidth demands. These...

A new Cramér–Rao lower bound for symbol timing recovery of linearly modulated (quadrature amplitude modulation) signals is presented. Contrary to some other works on the subject, the transmitted data is assumed to be unknown at the receiver. The bound is derived from a likelihood function that includes the symbol randomness. For large number of symbols, the bound is achievable at any signal-to-...

The study presented in this article investigated the removal of copper ions from aqueous solutions by a synthetic hydrogel-forming adsorbent polymer based on sodium alginate (SA) and hydroxy apatite (HA) nanoparticles. The effect of adding Zeolite on the adsorption performance of this hydrogel was also investigated, and the optimum amount of Zeolite was determined by changing its quantity. The ...