نتایج جستجو برای: radio frequency

تعداد نتایج: 548067  

2002
Imrich Chlamtac Chiara Petrioli Jason Redi

A myriad of applications such as radio frequency identification (RFID) and smart card networks are emerging in which nodes are designed for extremely low-cost, large scale applications such that the replacement of batteries is not feasible. Energy conservation therefore becomes a major constraint. Classical access protocols are either not energy conserving or lead to unacceptable delays. In a p...

2001
D. G. Watters

Wireless sensors can be realized by integrating a sensor with a passive commercial radio-frequency identification (RFID) chip. When activated, the chip responds with a digitally encoded signal that not only identifies the sensor but also contains information about the sensor state. Two devices have been developed to date: a temperature-threshold indicator and a chloride-threshold indicator. Thi...

2004

We focus on a simple inventory system at a retailer store, whose operations reflect the fact that in the real world, the execution of moving goods in a supply chain is often not without errors. Using simulation, we show that if ignored, these errors can result in substantial cost increases to the retailer, and therefore affect his bottom line. As the newly emerged radio frequency identification...

2010
Daniel Hellström Mathias Wiberg

Purpose – This paper aims to explore and describe the impact of radio frequency identification (RFID) technology on inventory accuracy within a production and assembly plant, and to propose a model for assessing the impact of the technology on inventory accuracy. Design/methodology/approach – The empirical investigation, based on case study research, focuses on an RFID implementation at a suppl...

2016
Hadiseh Rezaie Mehdi Golsorkhtabaramiri H. Rezaie M. Golsorkhtabaramiri

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...

2009
Karen Crooker Suresh Chalasani

In this paper we use the implementation of radio frequency identification (RFID) in various sectors of the healthcare industry as an illustration and application of how academics and managers may assess the potential for new technologies to be sustaining or disruptive to an organization. We review RFID technology, summarize literature related to disruptive innovation, develop a qualitative fram...

Journal: :Applied sciences 2021

In a frequency hopping spread spectrum (FHSS) network, the pattern plays an important role in user authentication at physical layer. However, recently, it has been possible to trace through blind estimation method for (FH) signals. If can be reproduced, attacker imitate FH signal and send fake data FHSS system. To prevent this situation, non-replicable system that targets layer of network is re...

In this paper, a wideband rectenna without using matching networks is presented. In addition of wide bandwidth, the omnidirectional radiation pattern, maximum radio frequency to dc conversion efficiency, harvesting capability of the minimum input power level, easy fabrication process cause this antenna be a good choice for radio frequency energy harvesting applications. Matching network has bee...

Journal: :international journal of industrial engineering and productional research- 0
yahia zare mehrjerdi department of ie

abstract purpose of this paper: the purpose of this article is to review some of the most prominent applications of rfid in industries and to provide a comprehensive review of the work done from 1985 through 2007 and the research trend on that. the effectiveness of rfid and the challenges that it is facing with are also discussed. some applications of radio frequency identification in supply ch...

2013
Zhixiong CHEN Qinghe GAO Dongsheng HAN

Anti-collision algorithms of active RFID system are studied and simulated by the OMNeT++ software. The active RFID system based on ZigBee RF module is analyzed firstly, which uses the anti-collision mechanism involving the CSMA/CA algorithm of IEEE 802.15.4 protocol. Given the IEEE 802.15.4 simulation framework and configurations on the OMNeT++ simulation platform, simulations and analyses abou...

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