Ultra wideband radar is one of the most promising techniques for non-invasive imaging in a dielectric medium, which is suitable for both medical screening and non-destructive testing applications. A novel imaging method for such an application is proposed in this brief paper, which has been extended from the advanced range points migration method to a multi-static observation model with circula...

In this paper an overview of the reported parameters of the Ultra Wide Band (UWB) indoor wireless channel is presented. First, an introduction to UWB technology as well as UWB wireless channels is provided. Then, impulse response model for the wireless indoor channel is introduced. The available UWB channel measurements results in indoor environments are consulted and accordingly, the major UWB...

This paper presents the study undertaken with block spread OFDM and compares three spreading matrices. The matrices include the Hadamard, Rotated Hadamard and Mutually Orthogonal Complementary Sets of Sequences (MOCSS). The study is carried out for block lengths of M = 2, M = 4 and M = 8 and it shows that all the spreading matrices show improvement and a better performance over the conventional...

We present an overview of physical and mediumaccess-control (MAC) layer research for communication and localization in ultra-wideband (UWB) sensor networks for industrial applications, and provide a summary of our results obtained under the umbrella of the EU Integrated Project PULSERS. The focus of our work is on fundamental questions about UWB channel modeling, UWB channel capacity, efficient...

ultra-endurance mountain running has become extremely popular in recent years, and the energy cost is one of the factors that influence the final performance. the aim of this study was to determine if the energy cost of uphill running (uphill cr) can be calculated from level cr (energy cost of running in mlo2.kg-1.mn-1) in a heterogeneous group of mountain ultra-endurance runners using the di p...

aim : the aim of this study is to evaluate the accuracy of preoperative abdominal ultrasonography in suspected appendicitis, and equivocal exam. background : acute appendicitis is a common problem and occasional challenging diagnosis in emergency department of every general hospital. patients and methods : within a period of one year from march 2007 through march 2008, all patient with suspecte...

abstract background: inadequate dialysis is one of the main causes of mortality of the patients undergoing hemodialysis. the methods that lead to improvement of dialysis adequacy in these patients are of great importance due to them causing an improvement of quality of life. as numerous factors can play a role in improvement of dialysis adequacy, the present study aimed to investigate the level...