Detection of anomalous network traffic is accomplished using a generalized likelihood ratio test (GLRT) applied to traffic arrival times. The network traffic arrival times are modelled using a Markov modulated Poisson process (MMPP). The GLRT is implemented using an estimate of the MMPP parameter obtained from training data that is not anomalous. MMPP parameter estimation is accomplished using ...

Abstracr--In this paper, we deal with the uplink outage probability for a UMTS cellular network at a reference base station equipped with a smart antenna. Users are assumed to be distributed according to a planar Poisson point proce:rs. Their respective transmission rates are modeled by independent random variables. This leads to a compound Poisson process for the total data rate to be served i...

The limit of vanishing ratio of the electron mass to the ion mass in the isentropic transient Euler-Poisson equations with periodic boundary conditions is proved. The equations consist of the conservation laws for the electron density and current density for given ion density, coupled to the Poisson equation for the electrostatic potential. The limit is related to the low-Mach-number limit of K...

Among the different models of networks usually considered, the hexagonal network model is the most popular. However, it requires extensive numerical computations. The Poisson network model, for which the base stations (BS) locations form a spatial Poisson process, allows to consider a non constant distance between base stations. Therefore, it may characterize more realistically operational netw...

We prove that for the iterated Poisson polynomial rings known as nilpotent algebras (or Poisson-CGL extensions), prime spectrum is catenary, i.e., all saturated chains of inclusions ideals between any two given have same length.

The presence of silicon carbide (SiC) fibers in the SiC smelter work environment has suggested a possible cancer hazard. The authors studied cancer incidence among 2,620 men employed for more than 6 months in three Norwegian SiC smelters. Follow-up from 1953 to 1996 revealed an overall excess risk of lung cancer (standardized incidence ratio = 1.9, 95% confidence interval (CI): 1.5, 2.3) and an...

There has been much work in exploiting the potential field relationships to extract information from the data. Kanasewich and Agarwal in 1970 explored the validity of examining the magnetization to density ratio in the wavenumber domain as an interpretation tool. Directly combining magnetic and gravity derived gravity gradient data in the spatial domain through the Poisson relation has been acc...

RESEARCH DESIGN AND METHODSdWe undertook a cohort study using linked administrative healthcare and laboratory databases in Alberta, Canada. From 1 January 2004 to 31March 2009, we included all outpatients 66 years of age and older who had at least one serum creatinine and one A1Cmeasured. To examine the independent association between hospitalized hypoglycemia and all-cause mortality, we used t...

We present here by direct argument the classical Clopper-Pearson (1934) “exact” confidence bounds for the binomial or negative binomial parameter p, for the Poisson parameter λ, and for the ratio of two Poisson parameters, ρ = λ1/λ2. The bounds presented here are exact in the sense that their confidence level of covering the unknown parameters is at least the specified and targeted value γ, 0 <...