RFID technology has recently been exploited for not only identification but also sensing including trajectory tracking and gesture recognition. While contact-based (an tag is attached to the target of interest) achieved promising results, contactless still faces severe challenges such as low accuracy situation gets even worse when non-static, restricting its applicability in real world deployment. In this work, we present TagRay, a RFID-based system, which significantly improves accuracy,...

Mechanical vibration sensing/monitoring plays a critical role in today's industrial Internet of Things (IoT) applications. Existing solutions usually involve directly attaching sensors to the target objects, which is invasive and may affect operations delicate devices. Non-invasive approaches such as video laser methods have drawbacks that, former incurs poor performance low light conditions, while latter has difficulties monitor multiple objects simultaneously.In this work, we design...

Two fluoro-containing monomers M1 and M2 derived from bio-based eugenol estragole were designed successfully synthesized via a facile one-step reaction. These copolymerized with commercial bismaleimide (BMI) in different molar ratios to give series of BMI polymers. The properties polymers investigated explore the effects modifiers on thermostability, hydrophobicity, dielectric BMIs. polymer incorporated showed low content (Dk) 2.89 loss (Df) 6.1 × 10–3 at high frequency 10 GHz. Moreover, it...

Handwriting recognition systems have greatly enhanced AIoT applications, especially in human-computer interaction. Wireless-based methods, favored for their non-invasive nature and ease of deployment, are becoming more common. However, existing works, which typically depend on the user’s position, often perform poorly varied writing positions. Additionally, they do not incorporate user identity information, could lead to security vulnerabilities by failing reject unauthorized users. To...

Since sleep plays an important role in people's daily lives, monitoring has attracted the attention of many researchers. Physical and physiological activities occurring exhibit unique patterns different stages. It indicates that recognizing a wide range (events) can provide more fine-grained information for stage detection. However, most prior works are designed to capture limited events coarse-grained information, which cannot meet needs monitoring. In our work, we leverage ubiquitous...

Abstract Being a disubstituted δ‐valerolactone synthesized by the telomerization of carbon dioxide with 1,3‐butadiene, 3‐ethylidene‐6‐vinyltetrahydro‐2H‐pyran‐2‐one (EVL) contains six‐membered ring and two unsaturated groups. This report describes synthesis an amphiphilic graft copolymer combination thiol‐ene click polymerization ring‐opening grafting reaction EVL, ethyldithiol (EDT), methoxy polyethylene glycol (mPEG‐OH). The alternating P(EVL‐ alt ‐EDT) 17.9 wt% CO 2 content weight‐average...

Abstract Herein, a three‐armed amphiphilic metallacycle‐cored star supramolecular polymer ( Por‐MOM‐PDMAEMA ) has been designed and synthesized via highly efficient post‐assembly polymerization. This is further self‐assembled into nanoparticles of different sizes depending upon the experimental conditions. The gas‐controlled morphology transformation tunable antibacterial activities systematically investigated compared with metallacycle (MOM). superior activity against multidrug‐resistant P....

RFID technology has recently been exploited for not only identification but also fine-grained trajectory tracking and gesture recognition. While contact-based (a tag is attached to the target of interest) sensing achieved promising results, contactless still faces severe challenges such as low accuracy inability sense multiple targets simultaneously in proximity, restricting its applicability real-world deployment. In this work, we present Tamera , a RFID-based system, which significantly...

Recent years have witnessed the emerging development of single-antenna wireless respiration detection that can be integrated into IoT devices with a single transceiver chain. However, existing single-antenna-based solutions are all limited by short sensing range within 2-4 m due to noise interference, which makes them difficult adopted in most room-scale scenarios. To deal this dilemma, we propose room-scale, noise-resistance, and accurate monitoring system, named Wi-Cyclops , 1 captures CSI...

Cross-Technology Communication (CTC) is an emerging technology that enables physical-layer direct communication from a WiFi sender to other Internet of Things (IoT) receivers via waveform emulation. Previous research has primarily relied on the reverse engineering identify suitable payloads capable emulating waveforms similar desired IoT packets (e.g., ZigBee). However, this approach several limitations, including irreversibility, scalability challenges, symbol misalignment, and...

<title>Abstract</title> Cyclo[n]carbons (Cn), a family of molecular carbon allotropes, have attracted significant attention owing to their elusive geometric structures and unique aromaticity. Cn consists sp-hybridized atoms, thus processing two perpendicular (out-of-plane in-plane) conjugated π-electron systems (Fig. 1a, b). For even-numbered cyclocarbons, the aromaticity can be predicated by Hückel’s rule, as known double for n = 4 k + 2, where is non-negative integer (e.g., C6, C10, C14,...

In this work, we devise RF-DJ, a contactless music recognition system with the help of COTS RFID device. Since is caused by vibration and can influence RF signal, our could accurately recover frequency every tone, especially string instruments. Specifically, RF-DJ immune to noises from player/instrument motions ambient environment. Further more, it high signal relatively low sampling rate data. demonstration, put one tag on surface ukulele (not string) achieve overall accuracy $93%, 90%,...

Desktop is a reliable and amicable object carrier that accompanies us in our daily life, while working, eating even entertaining. In this work, we devise contactless but accurate tracking system on desktop with commercial RFIDs. Comparing conventional vision or acoustic based solutions, needs less computational resources could be mucheasier for deployment. Moreover, ours record the true positions each device instead of relative delivered most previous studies. To end, recording user's access...

In this paper, we propose a system called RFRecorder based on COTS RFID which can inspect the string vibration and recognize tone tempo accurately. Our recover music score played by some instruments such as ukulele. Specifically, influences reflection of RF signal causes phase change. This change be captured analyzed to frequency vibration. addition, tag is attached body instrument but not string, affect playing. Compared recorder, our immune environmental noise. Furthermore, it also work...

Mechanical vibration monitoring plays a critical role in today's industrial Internet of Things (IoT) applications. Existing invasive solutions usually directly attach sensors to the target, which may affect operations delicate devices. Non-invasive video-based approaches incur poor performance low light conditions, and laser-based ones have difficulties monitor multiple objects simultaneously. In this work, we propose <i>RF-Ear<inline-formula><tex-math...

Mechanical vibration sensing is one of the most critical issues for advanced industrial IoT applications, such as troubleshooting and working condition analysis. Different from status quo solutions, approaches based on wireless have advantages non-invasive easy to deploy. However, existing works RFID radar are limited by deployment distance or NLoS scenarios. In this work, we propose a system using COTS WiFi named Wi-Ear, which could monitor multiple devices in LoS Moreover, Wi-Ear can...

&lt;p&gt;Reliability option (RO) is a generation capacity adequacy mechanism based on concept in financial products. Recent studies RO lack the consideration of game between power producers. In this paper, market equilibrium under studied and bilevel model proposed. The upper-level models are maximizing profits producers lower-level clearing. Electricity sales income, fee income expenditure including fuel cost, expansion investment refund cost penalty considered to evaluate each producer's...

&lt;p&gt;Reliability option (RO) is a generation capacity adequacy mechanism based on concept in financial products. Recent studies RO lack the consideration of game between power producers. In this paper, market equilibrium under studied and bilevel model proposed. The upper-level models are maximizing profits producers lower-level clearing. Electricity sales income, fee income expenditure including fuel cost, expansion investment refund cost penalty considered to evaluate each producer's...