Sharif Digital Repository

Due to extension of wireless networks, indoor positioning service becomes more important in new generations of WLAN networks. Complicated nature of indoor propagation channel decreases the quality of localization service in urban area. To overcome this problem, we surveyed characteristics of indoor radio channels and proposed methods to specify channel parameters to reduce its effect on positioning error. For this purpose, we introduce some super resolution methods and compare their precision and ability to implement on hardware. Among all of them, Matrix Pencil is selected and its mathematical functions are analyzed and stated in numerical algorithms and basic units. In implementain phase,... 

Urban transportation is one of the key parameters and indicators that determine the sustainable development of the city, in other words, to understand and evaluate the sustainability of a city, its transportation system must be considered. Bicycles can be considered the most sustainable means of urban transportation not only for short trips but also for medium trips.Urban bike networks in major cities are being systematically serviced and, like any other system to manage this volume of events, are facing challenges that we aim to improve one of the major costs of this system. The biggest challenge we face on this network is the imbalance between Inbound and outbound bicycles at different... 

The investigation of interface residual stress and interface elastic moduli tensors plays a crucial role in enhancing the conventional theory of elasticity. These considerations allow us to account for size effects and eliminate nonphysical singularities near defects. The primary objective of this study is to comprehensively calculate interface energy, residual stress components, and interface elastic moduli tensors for various interfaces between non-magnetic fcc metals using density functional theory (DFT). We achieve this by performing ab initio DFT calculations to determine the interface energies for different coherent interfaces among these metals. Subsequently, these energies are...