Behavior analysis of TCP Linux variants

The Transmission Control Protocol (TCP) is used by the vast majority of Internet applications. Since its introduction in the 1970s, a lot of variants have been proposed to cope with the different network conditions we can have (e.g., wired networks, wireless networks, satellite links) and nowadays Linux OS includes 13 different TCP variants.The aim of this paper is to offer a comparative analysis of the behavior of the different TCP Linux variants, in terms of throughput, fairness, and friendliness.     

Non-parametric estimation of conditional moments for sensitivity analysis

In this paper, we consider the non-parametric estimation of conditional moments, which is useful for applications in global sensitivity analysis (GSA) and in the more general emulation framework. The estimation is based on the state-dependent parameter (SDP) estimation approach and allows for the estimation of conditional moments of order larger than unity. This allows one to identify a wider spectrum of parameter sensitivities with respect to the variance-based main effects, like shifts in the variance, skewness or kurtosis of the model output, so adding valuable information for the analyst, at a small computational cost.     

Digital Signal Processing for Mass Identification in a $4pi$-Detector, Using Time of Flight Measurement

CHIMERA is the only 4 pi-multidetector, used in intermediate nuclear physics experiments, able to perform mass identification of the reaction products. To this purpose, it employs time of flight measurements done with traditional time to digital converters. In order to improve the resolution in mass identification, we have applied digital signal processing to time of flight measurements. This paper presents the methodology for data analysis, the adopted algorithms and the results obtained at different sampling frequencies (mass identification up to A = 33 for the reaction products produced by a 20.5 MeV/u ²⁰Ne beam on ²⁷Al target).     

Spatial and physical frames of reference in positioning a limb

Splints attached to the right forearm were used to rotate the forearm's physical reference frame, as defined by the eigenvectors of its inertia tensor, relative to its spatial reference frame. In two experiments, when subjects were required to orient the forearm parallel to, or at 45 degrees to, the environmental horizontal, they produced limb orientations that were systematically deflected from the forearm's longitudinal spatial axis in the direction of the forearm's physical axes. The position sense seems to be based on inertial eigenvectors rather than on joint angles or gravitational torques.     

[Without Title]

Letter from the Editors

      

Beating the L out of inductive transients.

Considers techniques that neutralize effects of circuit inductance caused generally by extraneous radio frequency (RF) voltage changes. The study was concerned chiefly with RF interference which "arises from transients in the power supply that energizes the solid state devices and from transients due to relay switching." The need for a well regulated power source is indicated. Hence, inductive loads DC and AC are focused on in the discussion. The combination of load matching with electronic zero-crossing switching is examined in relation to electrical interference. (PsycINFO Database Record (c) 2010 APA, all rights reserved)