Control system design for complex nonlinear systems has been widely studied in the last decade. Many remarkable results in this area have been reported, including feedback linearization techniques (Isidori 1989, Esfandiari and Khalil 1992), backstepping design (Krstic et al. 1995) for systems with unmatched uncertainties (Koshkouei et al. 2004). For uncertain systems, sliding mode control appro...

Poliomyelitis is a problem receiving increasing attention in this country. Although this disease is as old as ancient Egypt, its importance has only been recently recognized and before the middle of this century no significant study of the disease had been carried out. Statistical surveys (Paul, Havens and Van Rooyen, 1944; Paul, 1949; Khalil, Ragab and Sakr, 1954; Gilliam, Hemphill and Gerende...

Background: The incidence of twins worldwide continues to increase. The intrapartum management of twins is a major area of risk in obstetrics, and the optimal mode of delivery is a subject of continuing debate, this can affect the physician counseling, and maternal requests for elective cesarean delivery. Planned caesarean delivery could theoretically avoid some of the risks but direct evidence...

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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L’archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau...