Collision-induced timing shifts, i.e., changes in the arrival time of a signal due to interaction with signals in neighboring frequency channels, is a major issue in on-off-keying, wavelength-division-multiplexed (WDM) systems. The problem is complex if dispersion management is used: because of the periodic change of the sign of the chromatic dispersion with distance, pulses in different freque...

Type II topoisomerases are essential enzymes that regulate DNA topology through a strand-passage mechanism. Some type II topoisomerases relax supercoils, unknot and decatenate DNA to below thermodynamic equilibrium. Several models of this non-equilibrium topology simplification phenomenon have been proposed. The kinetic proofreading (KPR) model postulates that strand passage requires a DNA-boun...

Every year, there are millions of documented vehicle collisions involving cervids across Europe and North America. While temporal patterns in collision occurrence are relatively well described, few studies have targeted deer behaviour as a critical component of collision prevention. In this study, we investigated weekly and daily patterns in road crossing behaviour in roe deer. Using road cross...

rfid system is a wireless technology that can transfer data between tags and readers via radio frequency. in an rfid network, readers are located close to each other to obtain optimal connectivity and sufficient coverage. in such an environment, which is called dense reader environment (dre).different types of collisions such as reader-to-reader and reader-to-tag ones, often lead to serious pro...

In this paper, a multi-tag anti-collision method with collision signal recovery for UHF RFID systems is proposed. Signal recovery of 2 tags or 3 tags is adopted in the algorithm and the frame size is optimized accordingly. Simulation results show that the average system efficiency of the proposed anti-collision algorithm can be up to 67%, while the system efficiency of the algorithms without ad...

The Reader Collision Problem (RCP) is a bottle-neck decreasing the reading efficiency in multiplereader RFID systems. This paper proposed a novel anti-collision protocol – DRA (Distributed Reservation-based Anti-collision) protocol to solve the RCP in multiple-reader RFID systems. Temporal Cluster Headers (TCHs) are dynamically selected among the potentially interfered readers in DRA protocol. ...

Wireless Sensor Network (WSN) and Radio Frequency Identification (RFID) systems have engrossed considerable attention in recent years for ubiquitous computing. Their use revolutionizes diverse application areas. The integration of WSN and RFID enhances the capabilities of both the technologies providing way to diverse research areas. The integrated network of WSN and RFID systems involves vario...

RFID is one of automatic technology to identify and collect object data quickly through RF digital signals. RFID increases productivity and convenience. RFID is used for hundreds, if not thousands, of applications such as preventing theft of automobiles and merchandise; gaining entrance to buildings; automating parking. But one of the largest disadvantages in RFID system is its low tag (transpo...

In the field-driven, thermostated Lorentz gas the collision frequency increases with the magnitude of the applied field due to long-time correlations. We study this effect with computer simulations and confirm the presence of nonanalytic terms in the field dependence of the collision rate as predicted by kinetic theory.