6Th International Multi-Conference on Systems, Signals and Devices, Date: MAR 23-26, 2009, Location: Djerba, TUNISIA, Sponsors: Univ Sfax, ENIS, Univ Chemnitz, Philadelphia, Univ, Amman, CISEN comp, SEIMENS, QUNDIS, British Gas, Etudes Realisat Elect, Meubles Samet, IEEE Instrumentat & Measurements Soc, IEEE German Chapter, Instrumentat & Measurement Soc