Sharif Digital Repository

An RFID (Radio Frequency Identification) device consists of a small and inexpensive microchip attached to an antenna. The chip can be very small and some RFID tags are thin enough to be embedded in paper. RFID are heavily used to track items in production environments and to label items in supermarkets, Hospital, Factory, License plate, Cattle….They are usually thought of as an advanced barcode. However, in this project we argue about RFID license plate and using RFID tags for recognize vehicle from distance. Radio Frequency Identification (RFID) tags has many applications in modern automatic and intelligent identification systems. Vehicles outfitted by RFID tags as License Plates, can be... 

RFID systems are available in various applications for indoor and outdoor positioning. Location awareness in public environment and in stores and companies are widely in use. In indoor environment , multipath and fading changes signals specification, so it is difficult to detect the related parameters. In the other hand the necessity of fast and reliable system which support traffic and a large number of users are in demand. RFID which is based on radio frequency signals is developed for this aim.RFID system with asymmetrical link which support UWB and Narrowband signals is suggested for indoor positioning application. RFID passive tag in this system is redesigned in his thesis.... 

Radio Frequency Identification (RFID) is a fast developing research area in the pool of analog RF circuit design. Its applications are growing rapidly, in very different sectors ranging from supply chain management to airport baggage handling or traffic management for non-stop toll collection, etc. RFID surpasses the conventional bar code system in so many fields such as, long read range, multiple tag identification, contactless, re-programmability of tags and no need for a line-of-sight.
Inthis projecta new approach for modeling and reducing the Multi Path Fading (MPF) error is proposed. It isbased on Direction of Arrival (DOA) technique in thepositioningofpassivetags in UHFRFID... 

Ever-encreasing progress in the field of wireless communication has paved the way for utilisation based on radio frequency authentication systems. In recent years, ITU started the scenario of "Internet of Things". RFID systems have an exclusive role in development ofthis idea, since they can make it possible for things which have an ID to be identified automatically in a large scale. The necessity of identification and tracing people and things has caused the deployment of RFID technology. Onthe other hand, these systems communicate via a wireless channel to transmit data, therefore they are vulnerable to eavesdropping and interception. Thus, one of the most important issues in using such... 

Quorum Sensing is a cell-to-cell communication pr°Cess depending on cell concentration. Communication among bacterial cells °Ccurs through small molecular signals called autoinducers. The consequences of quorum sensing include the activation of pathogenic properties and activation of the gene for biofilm formation. Biofilms are aggregations of bacteria that adhere to surfaces through extracellular polymeric substances. Bacteria in the biofilm phase are much more resistant to antimicrobial agents than their free-swimming counterparts (i.e. the bacteria in planktonic form). In this study, first a series of coumarin derivatives were synthesized; but due to low solubility of the synthesized...