Selected articles for topic: cost of passive rfid tags
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Alien Technology Trusted Performance™ for RFID
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The Hydra Vision
A large number of relatively simple readers with high connectivity and great performance that crushes the overall cost of the system and installation.
ALR-F800-X
A New Revolutionary Solution That Combines an Enterprise RFID Reader and Edge Service to Provide Multiple-Reader visualization and...
Website:
http://stage.alientechnology.com
RFID History | RFID Development Timeline | Radio ...
NFC Near Field Communications
The history of RFID dates back further than many people may think.
Many say that RFID history dates back to the Second World War, and although the techniques that are used today have been developed significantly since those times and have been used in a different application, the same ideas apply.
RFID history & early beginnings
While RFID history can be traced back...
Website:
http://www.radio-electronics.com
RFID Tracking for Small Business: Advantages and Pitfalls ...
But the far more small companies continue to pass up this technology when it could be boosting their business.
There's one good reason why small businesses would choose not us implement RFID systems: the cost for major installations of RFID, for example in shipping hubs, can run six or seven figures. But the great thing about RFID is that is has a range, so unlike a barcode, it's about more than...
Website:
https://www.allbusiness.com
RFID Gen 2 - What is it? - Smart RFID! - SkyRFID Inc.
RFID Gen 2 - What is it? - Smart RFID!
The following page is a White Paper RFID on the current RFID World and what it means.
In order to understand what�Gen 2 is we first have to look at what EPC and EPCglobal means.
EPC is the new Electronic Product Code that replaces the older UPC (Universal Product Code) found on many�item labels and is a�set of numbers�plus a bar code.� Since�UPC...
Website:
http://www.skyrfid.com
Related topics : uhf gen 2 rfid tag / epc class 1 passive rfid tags / rfid uhf gen 2 reader / rfid uhf gen 2 / epc gen 2 rfid tag
RFID Time & Attendance Software and Systems. RFIDENTITY
Payroll is automated and integrated seamlessly with your accounting system--replacing manual time-card entry with automatic time-card management--saving you time, money and headaches. RFIDENTITY offers large, scalable solutions that will grow with your business, allowing for rapid deployment and customizable user management.
Modules
RFID Passive Time ClockEmployee TrackingEmployee Geo...
Website:
http://www.rfidentity.com
Hospital Active RFID Tags - Elpas
Healthcare Tags
Elpas offers application specific Active RFID Tags to help safeguard medical patients, assisted living residents and staff personnel and to better manage high-value medical delivery assets.
Deploying Elpas Active RFID Tags can help healthcare professionals to:
o Better protect patients, residents and staff personnel
o Enhance patient and resident care levels
o Improve regulatory compliance
o Increase asset usage while preventing shrinkage
o Reduce labor intensive staff assignments
o Lessen spoilage of perishables
No Resources available at this time
Product offerings and specifications are subject to...
Website:
http://www.elpas.com
PPT - RFID BASED LIBRARY MANAGEMENT SYSTEM PowerPoint ...
Fastest, easiest, most efficient way to track, locate & manage library materials
Efficient Book circulation management
Library inventory tracking in minutes instead of hours
Multiple books can be read simultaneously
Unique ID of the RFID tag prevents counterfeiting
Automated material handling using conveyor & sorting systems
RapidRadio Solutions Pvt. Ltd.
RFID Benefits Libraries...
Stock...
Website:
slideserve.com
RFID Asset Tracking - utsin.com
BLOGS
RFID Asset Tracking
Radio-frequency identification (RFID) is the wireless means of transferring data using electromagnetic fields with intent to recognize and track the labels connected to the objects automatically. Asset tracking is process of tracing the movement of the physical assets by scanning barcode tags bound to the assets or by smart tags such as passive RFID, whose range of transmission is limited to only few meters; however, smart tags using active RFID have the capacity to transmit up to 2000 meters.
Asset tracking system can track the location of assets, utilization of assets and produce range of reports. Before knowing the...
Website:
http://www.utsin.com
Hacking MIFARE & RFID for fun and profit | Hackmethod
MIFARE chips represent approximately 80% of the RFID passive tags in the world.
Think of MIFARE as being the most used type of RFID tags. NFC is simply a newer technology to interact with the first two. With that little bit of knowledge, let's focus on MIFARE. The MIFARE family is split into subcategories which can be briefly describe here:
MIFARE Classic 1K/4K: basically just a memory storage...
Website:
https://hackmethod.com
Copyright © Rajit Gadh 1 RFID Middleware. - ppt download
Presentation on theme: "Copyright © 2003-2007 Rajit Gadh 1 RFID Middleware."-- Presentation transcript:
1 Copyright © 2003-2007 Rajit Gadh 1 RFID Middleware
2 Copyright © 2003-2007 Rajit Gadh 2 RFID Middleware What is it? One notion: "This is a new breed of software that sits between the RFID reader and conventional middleware. It facilitates communication between enterprise systems and a...
Website:
http://slideplayer.com
Related topics : epc class 1 passive rfid tags / passive rfid tag data format / rfid tag data format / windows mobile rfid reader c# / uhf passive rfid tag reader
Matrics Creates New RFID Technology that Responds to ...
Matrics Creates New Ways to Secure Lives and Assets for Safe Commerce' Using Advanced RFID Technology; Responds to Homeland Security Initiative With Advanced RFID Technology to Provide Unique Real-Time Tracking of People, Vehicles, and High Value Assets
Matrics, a pioneer in the advanced development and standardization of low-cost, high-performance third generation UHF Radio Frequency...
Website:
secureidnews.com
Locatable-Body Temperature Monitoring Based on Semi-Active ...
1 School of Electronic and Information Engineering, Tianjin University, Tianjin 300192, China; E-Mails: nc.ude.iaknan@iewgnauguilhb (G.L.); nc.ude.ujt@60gnehs_eix (S.X.)
2 Nankai University Binhai College, Tianjin 300270, China
3 School of Electronics and Information Engineering, Tianjin Polytechnic University, Tianjin 300160, China; E-Mail: nc.ude.upjt@gniyilnehc
* Author to whom correspondence...
Website:
https://www.ncbi.nlm.nih.gov
5 Benefits of Using RFID in Manufacturing & Supply Chain ...
5 Benefits of Using RFID in Manufacturing & Supply Chain Management
RFID: A Growing Trend
Radio Frequency Identification (RFID), in particular passive RFID, has become increasingly common in industrial environments as a way to track and trace products, assets, and material flow. Although the technology has been around for decades, recent advances in tag design have driven the cost down to levels...
Website:
http://sickusablog.com
RFID vs Barcode | What's the Difference | GopherWerx
Barcodes are generally printed on paper or adhesive labels, so they are prone to wear and damage, while an RFID tag is generally a tougher product that can withstand more abuse.
The type and volume of data on barcodes is more limited than what can be stored on an RFID tag.
RFID vs. Barcode: Which is better?
A barcode
While it's easy, reading the similarities and differences of RFID and barcode...
Website:
http://gopherwerx.com
UHF RFID Readers | InfoChip
InfoChip offers a variety of RFID readers and mobile handhelds for UHF tags, as well as adapters for mobile devices and smartphones.
BlueBerry HS
Industry: Mining, Construction, Oil & Gas, Lifting, Power Utilities, Valve, Hose
BlueBerry HS UHF is an RFID key fob reader capable of reading an UHF RFID tag and transmit it via Bluetooth® to any device equipped with that interface. With the push of a...
Website:
infochip.com
An RFID-based luggage and passenger tracking system for ...
SAVE
Abstract
Market analysis studies of recent years have shown a steady and significant increase in the usage of RFID technology. Key factors for this growth were the decreased costs of passive RFIDs and their improved performance compared to the other identification technologies. Besides the benefits of RFID technologies into the supply chains, warehousing, traditional inventory and asset...
Website:
https://www.spiedigitallibrary.org
RFID in Hospitals, track patient, doctors, costly ...
Dassnagar Infosystems implements superior radio frequency identification based solutions targeted to smart hospital asset management and access control. Our RFID systems may be used to track patients, doctors and expensive equipment in hospitals. RFID tags can be attached...
Date: 2014-05-19 17:10:22
Website:
dassnagar.com
Related topics : rfid based hospital real time patient management system / patient tracking system using rfid / rfid hospital patient tracking / rfid hospital equipment tracking system / rfid patient tracking system
RFID in Hospitals, track patient, doctors, costly ...
Dassnagar Infosystems implements superior radio frequency identification based solutions targeted to smart hospital asset management and access control. Our RFID systems may be used to track patients, doctors and expensive equipment in hospitals. RFID tags can be attached...
Website:
dassnagar.com
UHF RFID Readers | InfoChip
InfoChip offers a variety of RFID readers and mobile handhelds for UHF tags, as well as adapters for mobile devices and smartphones.
Alien ALH-9011
Industry: Mining, Construction, Oil & Gas, Lifting, Power Utilities, Valve, Hose
This feature-rich reader delivers exceptional performance with best in class receive sensitivity, enhanced interference rejection, compact ergonomic footprint, delivering...
Website:
infochip.com
Related topics : 1128 bluetooth handheld uhf rfid reader / uhf rfid bluetooth handheld reader / uhf passive rfid tag reader / uhf rfid handheld reader price / 1128 handheld uhf rfid reader
UHF Gen 2 RFID Reader/Writer with a Swivel Read Head ...
This UHF Gen 2 RFID reader/writer belongs to GAO's family of 900MHz (UHF) RFID Readers. The line includes a wide variety of RFID readers to meet customers' different needs. Some featured products in this line include UHF 902 MHz Gen 2 Portable Handheld RFID Reader Writer, 902 MHz RFID Gen 2 UTE Portable Reader Writer and Rugged Handheld Terminal RFID Reader .
For...
Website:
https://www.newswire.com
Related topics : uhf gen 2 portable reader writer / rfid uhf gen 2 reader / handheld uhf rfid reader writer / uhf rfid reader writer / portable rfid reader writer
TraceTracker Asset Mobile
Track equipment with your mobile phone!
TraceTracker Asset Mobile (TT Asset Mobile) is a new application for smart telephones that tracks equipment and tools in near real-time. Now construction workers can increase their effectiveness by using mobile telephones that they already have in their pockets.�
TT Asset Mobile cuts the cost of equipment management and increases the accuracy of...
Website:
https://www.tracetracker.com
Related topics : rfid tag equipment tracking / mobile phone rfid tracking / rfid based asset tracking solution / rfid mobile phone applications / small rfid tag reader
Race Timing Tags | RFID Tags
Our Dual Frequency and Ultra High Frequency tags pair with IPICO readers to provide the industry's most accurate race timing systems. With tags for every race, IPICO tags are perfect for you. Any time, any place, any race.
Dual Frequency Shoe Tags
IPICO shoe tags provide the most accurate chip timing solution in the market. They are known to achieve 99.9998% accuracy in large-scale events with up...
Website:
http://www.activeendurance.com
Related topics : high frequency rfid tag / passive rfid tag frequency range / low frequency rfid tag / active rfid tag frequency range / active rfid tag frequency
Types of RFID - Control Electric Company
RFID products are then broken up into different frequencies. Tags and Antennas are tuned or matched much the same way as a radio is tuned to a frequency to receive different channels. These frequencies are grouped into Four basic ranges: Low Frequency, High Frequency, Very High Frequency and Ultra-High Frequencies.
Each frequency range has its advantages and disadvantages. Europe use 868 MHz. for...
Date: 2008-03-06 17:41:34
Website:
http://www.controlelectric.com
SUBPART 211.2 — USING AND MAINTAINING REQUIREMENTS DOCUMENTS
211.271 Elimination of use of class I ozone-depleting substances.
See Subpart 223.8 for restrictions on contracting for ozone-depleting substances.
211.272 Alternate preservation, packaging, and packing.
Use the provision at 252.211-7004 , Alternate Preservation, Packaging, and Packing, in solicitations which include military preservation, packaging, or packing specifications when it is...
Date: 2016-06-02 20:17:53
Website:
acq.osd.mil
Related topics : radio frequency identification tags (rfid) / rfid radio frequency identification tags / radio frequency identification rfid definition / radio frequency identification (rfid) asset tracking system / radio frequency identification rfid systems
SUBPART 211.2 — USING AND MAINTAINING REQUIREMENTS DOCUMENTS
211.271 Elimination of use of class I ozone-depleting substances.
See Subpart 223.8 for restrictions on contracting for ozone-depleting substances.
211.272 Alternate preservation, packaging, and packing.
Use the provision at 252.211-7004 , Alternate Preservation, Packaging, and Packing, in solicitations which include military preservation, packaging, or packing specifications when it is...
Website:
acq.osd.mil
Related topics : radio frequency identification tags (rfid) / rfid radio frequency identification tags / radio frequency identification rfid definition / radio frequency identification (rfid) asset tracking system / radio frequency identification rfid systems
Alien® Unveils New Handheld RFID Reader with All-Day ...
There were 500 press releases posted in the last 24 hours and 170,653 in the last 365 days.
Alien® Unveils New Handheld RFID Reader with All-Day Battery Life for Use with Latest Smart Devices
With ALR-S350, users can now perform heavy-duty inventory tracking with their own smart device -- independent of OS, cellular, or Wi-Fi restrictions
SAN JOSE, Calif., Jan. 10, 2018 (GLOBE NEWSWIRE) --...
Website:
https://www.einpresswire.com
Alien® Unveils New Handheld RFID Reader with All-Day ...
SAN JOSE, Calif., Jan. 10, 2018 (GLOBE NEWSWIRE) -- Alien Technology® , a leader in Radio Frequency Identification (RFID), today announced the new ALR-S350 RFID reader, which will make its debut at the NRF 2018 show (Booth 322) next week in New York. The ALR-S350 will be showcased along with additional Alien RFID solutions, including the new Hydra Series , that help retailers and supply chain...
Website:
https://finance.yahoo.com
Monitor 213: Reading data over an I2C bus - Windmill Software
Web link: http://www.windmill.co.uk/i2c.html
The I2C bus was developed by Philips Semiconductors. It was designed to provide communicaitons between integrated circuits, though now it's used in many other applications.
I2C uses just two wires: the clock wire (called SCL) and the data wire (called SDA).
All devices on the I2C bus are either a master or slave. There is generally just one master...
Website:
http://www.windmill.co.uk
Related topics : radio frequency identification tags (rfid) / rfid radio frequency identification tags / radio frequency identification rfid systems / radio frequency identification (rfid) / radio frequency identification device rfid
RFID UHF and HF Readers and Adapters | InfoChip
InfoChip offers a variety of RFID readers and mobile handhelds for UHF and HF tags, as well as adapters for mobile devices and smartphones.
UHF Readers
Alien ALH-9011
Industry: Mining, Construction, Oil & Gas, Lifting, Power Utilities, Valve, Hose
This feature-rich reader delivers exceptional performance with best in class receive sensitivity, enhanced interference rejection, compact ergonomic...
Website:
infochip.com
Related topics : 1128 bluetooth handheld uhf rfid reader / uhf rfid bluetooth handheld reader / uhf passive rfid tag reader / uhf rfid tag reader / uhf rfid handheld reader price
RFID Reader Kolkata, RFID Tracking Device, RFID Security ...
Mon - Sat: 9:00 - 18:00
WHAT WE DO?
We offer our customers a wide range of UHF Radio Frequency Identification (RFID) products and services to customers in retail, consumer goods, Manufacturing, defence, transportation and logistics, pharmaceuticals and other industries. �In close collaboration with our customers we create special solutions for hardware and software when the standard products do...
Website:
http://rfidautomation.com
rfid technology and applications | Download eBook pdf ...
Click Download or Read Online button to get rfid technology and applications book now. This site is like a library, Use search box in the widget to get ebook that you want.
Author by : Stephen B. Miles
Language : en
Publisher by : Cambridge University Press
Format Available : PDF, ePub, Mobi
Total Read : 48
Total Download : 449
File Size : 45,6 Mb
Description : Are you an engineer or manager...
Website:
http://www.e-bookdownload.net
Tracking system - Wikipedia
6 External links
Tracking in virtual space[ edit ]
In virtual space technology, a tracking system is generally a system capable of rendering virtual space to a human observer while tracking the observer's coordinates . For instance, in dynamic virtual auditory space simulations, a real-time head tracker provides feedback to the central processor, allowing for selection of appropriate head-related...
Date: 2018-01-10 13:26:56
Website:
https://en.wikipedia.org
RFID Read Range: Just how far can RFID track something ...
UPDATE: See our new RFID Read Range Tests for 2011
Tomorrow,�we�will�be� announcing the�new�AD�224�RFID chip�from�Avery�Dennison will be used in our Pro-Tags DoD product lines and our premier Nox-1 Asset Tracking products.
We�have�been�testing the new 224 RFID�chip�since�April�2008�and,�as�far�as Passive Generation�2�RFID�technology goes, it is...
Website:
http://simplyrfid.typepad.com
RFID Tags | Marks Infotech Limited | Distributor / Channel ...
Active/Passive UHF Tags (Gen 2)
Re-usable and durable
About Us
We are pleased to introduce ourselves as M/s. Markss Infotech Limited. MARKSS offers innovative, cost-effective automatic identification solutions for business and industry. MARKSS is direct partner in India for ZEBRA for their entire range of label, mobile, card & kiosk printers, barcode scanners, mobile terminals and RFID products,...
Website:
indiamart.com
New RFID system to monitor traffic, track down criminals
New RFID system to monitor traffic, track down criminals
Posted on 25 August 2015 - 12:45am
Last updated on 25 August 2015 - 01:10pm
Shahrim Tamrin
PUTRAJAYA: A new vehicle security tracking system suitable for all types of vehicles - the Radio Frequency Identification (RFID) - will be implemented nationwide by the Road Transport Department (JPJ) by 2018.
Even suitable for motorcycles, the...
Date: 2018-01-12 07:39:08
Website:
http://www.thesundaily.my
RFID Canada | Understanding Radio Frequency IDentification ...
RFID Canada is a leading technology provider with 25 plus years' experience in providing solutions including barcode, passive and active RFID (radio frequency identification).
RFID Canada warrants its success in identifying and developing comprehensive solutions in partnership wth some of the most innovative companies, such as software providers, engineering firms, automation companies and system...
Website:
rfidcanada.com
Related topics : radio frequency identification (rfid) asset tracking system / radio frequency identification technology (rfid) / radio frequency identification technology rfid / radio frequency identification rfid systems / radio frequency identification tags (rfid)
RFID Technology: The Future of Retail - Informs Inc.
by Chelsea Khouri | Aug 2, 2016 | Retail | 0 comments
ATTENTION ALL RETAILERS: We know what you're probably thinking.... What the heck is RFID anyway? If you're new to retail, or haven't heard of RFID, let's start off by reminding you what RFID is all about. RFID stands for radio frequency identification (RFID) technology. This technology uses a method of identifying items through radio waves....
Website:
http://www.informsinc.com
Global Control through the RFID Chip - michaeljournal.org
Global Control through the RFID Chip
Written by Yves Jacques on Thursday, 01 October 2009. Posted in Microchips
Total Surveillance and a Cashless Society
These current economic and social crises are leading to a global, financial "melt down" that the powerful global elite are using in order to establish a Global Financial Economic System. This will give centralized power to the United Nation's...
Date: 2017-03-04 00:40:44
Website:
michaeljournal.org
Related topics : rfid radio frequency identification chip implanted in all us citizens / radio frequency identification (rfid) chip / radio frequency identification rfid chip / implant rfid chip technology / radio frequency identification device rfid technology
Global Control through the RFID Chip - Michael Journal
Global Control through the RFID Chip
Written by Yves Jacques on Wednesday, 30 September 2009. Posted in Microchips
Total Surveillance and a Cashless Society
These current economic and social crises are leading to a global, financial "melt down" that the powerful global elite are using in order to establish a Global Financial Economic System. This will give centralized power to the United...
Website:
michaeljournal.org
Joshua E. Siegel :: Curriculum Vitae - mit.edu
Massachusetts Institute of Technology (Cambridge, MA)
I research context- and cognition-based secure and efficient architectures for the Internet of Things, as well as the application of pervasively-sensed data to vehicle failure prediction and design optimization. These architectures will allow more devices to be connected to the Internet, facilitating the richer data generation, sharing, and...
Date: 2017-10-26 10:34:06
Website:
http://www.mit.edu
Related topics : low cost rfid tag / battery assisted passive rfid tag cost / rfid passive tag cost / cost of passive rfid tags / rfid tag costs are currently
RFID technology - infsoft
Camera Systems
Indoor Localization with RFID
RFID (radio-frequency identification), which uses radio waves to wirelessly transmit the identity (e.g. serial number) and other characteristics of an object, is an emerging positioning technology that allows for mobility tracking of objects or people. As it offers a limited range of less than a meter, RFID is not suitable for area-wide positioning,...
Website:
https://www.infsoft.com
Tracking Technology Using RFID in Supply Chain Management
RFID technology has recently become one of the revolutionary element in supply chain management. Companies these days want to reduce the costs of their Supply Chain without affecting the service. Here automation and smart techniques play an important role, thus leading to these organizations using RFID solutions in transforming their global supply chain. RFID has proven to increase end-to end...
Date: 2018-01-12 08:49:17
Website:
mbaskool.com
RFID Canada | Products
Encoder System
We have extensive experience in providing front-end hardware solutions using RFID and NFC technologies. Our complete line of hardware products include, Passive Low Frequency-LF (125 & 134.2KHz), Passive High Frequency-HF (13.56MHz), Passive Ultra High Frequency- UHF (860-956MHz) as well as Active RFID. Working with highly reputable manufacturers in the industry, RFID Canada ensures that the best possible...
Website:
rfidcanada.com
Related topics : high frequency rfid tag / tag rfid nfc / rfid active tag technology / rfid tagging technology / rfid tag technology
RFID Canada | Products
Encoder System
We have extensive experience in providing front-end hardware solutions using RFID and NFC technologies. Our complete line of hardware products include, Passive Low Frequency-LF (125 & 134.2KHz), Passive High Frequency-HF (13.56MHz), Passive Ultra High Frequency- UHF (860-956MHz) as well as Active RFID. Working with highly reputable manufacturers in the industry, RFID Canada ensures that the best possible...
Website:
rfidcanada.com
Related topics : high frequency rfid tag / tag rfid nfc / rfid active tag technology / rfid tagging technology / rfid tag technology
Perspectives on RFID in pharmaceuticals | Healthcare Packaging
Perspectives on RFID in pharmaceuticals
RFID is a tool that can benefit pharmaceutical manufacturers from clinical trials through to the commercial supply chain.
Share
The U.S. Food & Drug Administration and Walmart provided a powerful boost for early adoption of Radio Frequency Identification (RFID) in pharmaceutical packaging to strengthen track-and-trace and anti-counterfeiting...
Date: 2018-01-12 08:49:25
Website:
healthcarepackaging.com
RFID Secure Protocol Based on Time-Based Hash Chain
RFID Secure Protocol Based on Time-Based Hash...
RFID Secure Protocol Based on Time-Based Hash Chain
Abstract:
Article Preview
This paper describes several typical RFID privacy protection protocol security methods. To improve the security of RFID protocols, which proposed in the literature and some deficiencies, propose a new time-based hash chain function. The program can be effective against...
Website:
scientific.net
RFID technology: Advantages and Disadvantages
Advantages of RFID Technology
The tag does not need to be in line of sight with the�receiver�to be read (compare to a barcode and its optical scanner)�(Shepard, 2004, p. 58).�
RFID tags can store a lot of information, and follow instructions
Has the ability to pinpoint location�
Technology is versatile: can be smaller than a thumb tack or can be the size of a tablet, depending on its...
Date: 2017-11-14 15:16:47
Website:
http://mbaigrfidreport.blogspot.com
RFID Atlanta - GAO RFID
Home
GAO RFID Serves Atlanta, Georgia
While our offices are located in Toronto, GAO RFID has been delivering smart RFID solutions to businesses across the Atlanta, Georgia area.
The city of Atlanta has had one of the most colorful histories in the United States.� It was able to rise from the hardships of the Civil War to transform itself into a national economic hub.� With a population of...
Website:
gaorfid.com
Asset Management Active RFID preventive maintenance
Contact Us
BURDENED BY MAINTENANCE COSTS ?
Even under normal operating conditions, assets can get increasingly stressed from over-use, inefficient maintenance, and aging. �So, in remote areas with�harsh environmental conditions, the picture is even grimmer. �It has become clear in the last few�years, that what has been done in the past will not be sufficient to address the growing and...
Website:
https://aiosystems.com
RFID in Healthcare Market - GlobeNewswire News Room
It considers current and future factors, offering readers an unrivalled understanding of the key topics all market participants should be aware of.
The RFID in healthcare market report projects global RFID revenues in healthcare to reach $2.3 billion in 2019.
At a time when...
Website:
https://globenewswire.com
Related topics : rfid in healthcare market / radio frequency identification tags in hospitals / radio frequency identification tags cost / passive rfid tag system / radio frequency identification tags (rfid)