We consider an ADSL access network consisting of subscribers, DSLAMs, metro Ethernet switches and a broadband remote access aggregation server (BRAS). We obtain expressions for dimensioning the access network in the upstream direction. Specifically, we show that the bandwidth required at each DSLAM, metro Ethernet switch, and BRAS can be expressed as an exponential function of the subscribers i...

Technological progress in tunneling has led to modern and efficient tunneling methods in vast underground spaces even under inappropriate geological conditions. Identification and access to appropriate and sufficient geological hazard data are key elements to successful construction of underground structures. Choice of the method, excavation machine, and prediction of suitable solutions to over...

Background: Alongside the dramatic increase of older adults in the United States (U.S.), it is projected that the aging population residing in rural areas will continue to grow. As the prevalence of chronic diseases and multiple chronic conditions among adults continues to rise, there is additional need for evidence-based interventions to assist the aging population to improve lifestyle behavio...

1 Clinical Research Department, Pasteur Institute of Iran, Tehran, IR Iran 2 Pediatric Infectious Disease Research Center, Tehran University of Medical sciences, Tehran, IR Iran 3 Iranian Society for Support of Patients With Infectious Diseases, Tehran, IR Iran 4 Tuberculosis and Pediatric Infectious Research Center (TPIRC), Arak University of Medical Sciences, Arak, IR Iran Hepat Mon.2012;12(7...

1. Molecular Medicine Research Center, Hormozgan University of Medical Sciences, Bandar Abbas, Iran 2. Dental Research Center, Faculty of Dentistry, Tehran University of Medical Sciences, Tehran, Iran 3. Orthodontic Department, Dental Branch, Islamic Azad University, Tehran, Iran 4. Molecular Immunology Research Center, Tehran University of Medical Sciences, Tehran, Iran 5. Nature of Gene Mutat...

nowadays, using public transportation vehicles like metro in large cities are of significance, and exposure to whole-body vibration for the metro passengers is one of the physical contaminations. this paper is conducted with the aim of evaluating the passengers’ convenience and health both in sitting and standing conditions. the present study was done on the passengers of lines 1, 2, and 4 of t...

This paper presents a new methodology for computation of optimal train schedules in metro lines using a linear-programming-based model predictive control formulation. The train tra5c model is comprised of dynamic equations describing the evolution of train headways and train passenger loads along the metro line, considering the time variation of the passenger demand and all relevant safety and ...

1. Department of Laboratory Medicine, Imam Hassan Mojtaba Hospital, Alborz University of Medical Sciences, Karaj, Iran 2. Research Center for Immunodeficiencies, Children’s Medical Center, Tehran University of Medical Sciences, Tehran, Iran 3. Primary Immunodeficiency Diseases Network (PIDNet), Universal Scientific Education and Research Network (USERN), Tehran, Iran 4. Department of Immunology...