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- 摘要
- 关键词
- 实验方案
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- 2019
- Topological change
- Multi-hop routing
- low latency
- Wearable Wireless Sensor Network
- wearable devices
- Communication Engineering
- Shenyang Ligong University
- Northeastern University
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Wireless phototherapeutic contact lenses and glasses with red light-emitting diodes
摘要： Light-mediated therapeutics have attracted considerable attention as a method for the treatment of ophthalmologic diseases, such as age-related macular degeneration, because of their non-invasiveness and the effectiveness to ameliorate the oxidative stress of retinal cells. However, the current phototherapeutic devices are opaque, bulky, and tethered forms, so they are not feasible for use in continuous treatment during the patient’s daily life. Herein, we report wireless, wearable phototherapeutic devices with red light-emitting diodes for continuous treatments. Red light-emitting diodes were formed to be conformal to three-dimensional surfaces of glasses and contact lenses. Furthermore, fabricated light-emitting diodes had either transparency or a miniaturized size so that the user’s view is not obstructed. Also, these devices were operated wirelessly with control of the light intensity. In addition, in-vitro and in-vivo tests using human retinal epithelial cells and a live rabbit demonstrated the effectiveness and reliable operation as phototherapeutic devices.
关键词： wearable healthcare,phototherapies,red light-emitting diodes,transparent electronics
更新于2025-09-12 10:27:22
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[IEEE 2019 28th Wireless and Optical Communications Conference (WOCC) - Beijing, China (2019.5.9-2019.5.10)] 2019 28th Wireless and Optical Communications Conference (WOCC) - Topology Variable Routing Algorithm for WWSN in Disaster Rescue
摘要： In recent years, the Wearable Wireless Sensor Network (WWSN) has become one of the most popular disaster relief networks. On-Body network is a key part of WWSN, which is responsible for the communication between wearable wireless sensor nodes and the coordinator in WWSN. The routing algorithm for On-body network is related to the energy consumption of wearable wireless sensor nodes and even the lifetime of the network. Therefore, this paper proposes a topology variable routing algorithm (TVRA) in On-Body networks. Firstly, the algorithm designs multi-hop routing to prolong the network lifetime on the premise of energy balance under the normal state of the network. When the network is abnormal, a single hop routing is adopted to ensure that the abnormal data can be sent with the lowest delay. The simulation results show that the proposed TVRA algorithm has better performance in terms of lifetime and time delay.
关键词： Topological change,Multi-hop routing,low latency,Wearable Wireless Sensor Network,wearable devices
更新于2025-09-11 14:15:04
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Organic Multi-Channel Optoelectronic Sensors for Wearable Health Monitoring
摘要： Recent progress in printed optoelectronics and their integration in wearable sensors have created new avenues for research in reflectance photoplethysmography (PPG) and oximetry. The reflection-mode sensor, which consists of light emitters and detectors, is a vital component of reflectance oximeters. Here, we report a systematic study of the reflectance oximeter sensor design in terms of component geometry, light emitter and detector spacing, and the use of an optical barrier between the emitter and the detector to maximize sensor performance. Printed red and near-infrared (NIR) organic light-emitting diodes (OLEDs) and organic photodiodes (OPDs) are used to design three sensor geometries: (1) Rectangular geometry, where square OLEDs are placed at each side of the OPD; (2) Bracket geometry, where the OLEDs are shaped as brackets and placed around the square OPD; (3) Circular geometry, where the OLEDs are shaped as block arcs and placed around the circular OPD. Utilizing the bracket geometry, we observe 39.7% and 18.2% improvement in PPG signal magnitude in the red and NIR channels compared to the rectangular geometry, respectively. Using the circular geometry, we observe 48.6% and 9.2% improvements in the red and NIR channels compared to the rectangular geometry. Furthermore, a wearable two-channel PPG sensor is utilized to add redundancy to the measurement. Finally, inverse-variance weighting and template matching algorithms are implemented to improve the detection of heart rate from the multi-channel PPG signals.
关键词： flexible electronics,printed electronics,pulse oximetry,organic optoelectronics,Reflection photoplethysmography sensor,wearable sensors
更新于2025-09-11 14:15:04
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A 2.6 μW Monolithic CMOS Photoplethysmographic (PPG) Sensor Operating with 2 μW LED Power for Continuous Health Monitoring
摘要： Photoplethysmography (PPG) enables wearable vitals monitoring. Nevertheless, it is still limited by the few mA of the LEDs driving current. We present a PPG sensor integrating an array of dedicated pinned-photodiodes (PPD) with a full readout chain integrated in a 0.18 μm CMOS Image Sensor (CIS) process. The sensor features a total input referred noise of 0.68 e?rms per PPD, independently of the input light, and achieves a 4.6 μW total power consumption, including the 2 μW LED power, at 1.38 bpm heart rate average error.
关键词： CMOS,wearable,CIS,PPG,low-power,low-noise,LED,Array,PPD,Photodetector
更新于2025-09-11 14:15:04
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A Kirigami Concept for Transparent and Stretchable Nanofiber Networks-based Conductors and UV Photodetectors
摘要： To meet the increasing demand for wearable electronics today, fabrication of the stretchable devices becomes crucial. In this respect, a stretchable conductor is an essential component for achieving stretchability of the device. Herein, a stretchable and transparent conductor unit, Au-metallized PVP (Au@PVP) nanofiber network on a kirigami-structured PDMS substrate, was newly developed. By a series of comparative studies, the effectiveness of our strategies to the sensing material owing to its high sensitivity for UV light and large surface to volume ratio. To point out its applicability, we fabricated a transparent and stretchable photodetector having the same geometry. ZnO nanorod, the 1D transparent metal oxide nanostructure, is used as a resistance, ~50% increase. It also exhibited ~80% transparency, as well as excellent durability. stretchable conductor showed high stretchability of 110% without significant change in invariant electrical conductivity and high stretchability is convincingly demonstrated. Our The resulting device showed outstanding ON/OFF ratio of 1020 at its original state and 440 under 80% strain. Its fast response/reset time, high transparency and stable performance indicate the feasibility of the stretchable and transparent optoelectronic device.
关键词： metal nanofiber network,transparent,photodetector,wearable electronics,kirigami,stretchable
更新于2025-09-11 14:15:04
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Flexible graphene photodetectors for wearable fitness monitoring
摘要： Wearable health and wellness trackers based on optical detection are promising candidates for public health uses due to their noninvasive tracking of vital health signs. However, so far, the use of rigid technologies hindered the ultimate performance and form factor of the wearable. Here, we demonstrate a new class of flexible and transparent wearables based on graphene sensitized with semiconducting quantum dots (GQD). We show several prototype wearable devices that are able to monitor vital health signs noninvasively, including heart rate, arterial oxygen saturation (SpO2), and respiratory rate. Operation with ambient light is demonstrated, offering low-power consumption. Moreover, using heterogeneous integration of a flexible ultraviolet (UV)–sensitive photodetector with a near-field communication circuit board allows wireless communication and power transfer between the photodetectors and a smartphone, offering battery-free operation. This technology paves the way toward seamlessly integrated wearables, and empowers the user through wireless probing of the UV index.
关键词： flexible graphene photodetectors,quantum dots,wearable fitness monitoring,UV index,health signs monitoring
更新于2025-09-11 14:15:04
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A feasible strategy to prepare quantum dot-incorporated carbon nanofibers as free-standing platforms
摘要： Recently, quantum dots (QDs) have often garnered significant attention and have been employed for various applications. Nevertheless, most conventional devices utilize a glass substrate and/or brittle substrate, which is not compatible with next-generation wearable electronics. A suitable method for devising conductive and flexible free-standing platforms that can be combined with various kinds of QDs is thus in great need for next-generation wearable electronics. In this work, we introduce a universal and simple method to coat QDs on carbon nanofibers (CNFs) by a dip-coating process, where many kinds of QDs can be well decorated on the surface of CNFs. As one potential application among many, QD-coated CNFs were examined for their photocatalytic applications and characterization. As a result, it was found that the best performance of CdSe QD-coated CNFs for hydrogen production was 3.8 times higher than that of only QDs with the same 1 mg of QDs. This is an early report on fabricating various kinds of QD-coated CNFs, which can be extended to a myriad set of applications.
关键词： photocatalytic applications,wearable electronics,quantum dots,carbon nanofibers,dip-coating
更新于2025-09-11 14:15:04
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Nanowire network-based photodetectors with imaging performance for omnidirectional photodetecting through a wire-shaped structure
摘要： Wearable photodetectors (PDs) have attracted extensive attention from both scientific and industrial areas due to intrinsic detection abilities as well as promising applications in flexible, intelligent, and portable fields. However, most of the existing PDs have rigid planar or bulky structures which cannot fully meet the demands of these unique occasions. Here, we present a highly flexible, omnidirectional PD based on ZnO nanowire (NW) networks. ZnO NW network-based PDs exhibit the imageable level performance with an on/off ratio of about 104. Importantly, a ZnO NW network can be assembled onto wire-shaped substrates to construct omnidirectional PDs. As a result, the wire-shaped PDs have excellent flexibility, a large light on/off ratio larger than 103, and 360° no blind angle detecting. Besides, they exhibit extraordinary stability against bending and irradiation. These results demonstrate a novel strategy for building wire-shaped optoelectronic devices through a NW network structure, which is highly promising for future smart and wearable applications.
关键词： Wearable photodetectors,Flexible optoelectronic devices,Omnidirectional photodetecting,ZnO nanowire networks
更新于2025-09-11 14:15:04
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[ACM Press the 2018 ACM International Symposium - Singapore, Singapore (2018.10.08-2018.10.12)] Proceedings of the 2018 ACM International Symposium on Wearable Computers - ISWC '18 - Seeing into the brain of an actor with mocap and fNIRS
摘要： This paper introduces the idea of using wearable, multi-modal body and brain sensing, in a theatrical setting, for neuroscientific research. Wearable motion capture suits are used to track the body movements of two actors while they enact a sequence of scenes together. One actor additionally wears a functional near-infrared spectroscopy (fNIRS)-based headgear to record the activation patterns on his prefrontal cortex. Repetitions in the movement data are then used to automatically segment the fNIRS data for further analysis. This exploration reveals that the semi-structured and repeatable nature of theatre can provide a useful laboratory for neuroscience, and that wearable sensing is a promising method to achieve this. This is important because it points to a new way of researching the brain in a more natural, and social, environment than traditional lab-based methods.
关键词： Wearable,fNIRS,theatre,mocap,neuroscience
更新于2025-09-11 14:15:04
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[IEEE 2018 17th ACM/IEEE International Conference on Information Processing in Sensor Networks (IPSN) - Porto (2018.4.11-2018.4.13)] 2018 17th ACM/IEEE International Conference on Information Processing in Sensor Networks (IPSN) - Poster Abstract: Zero-Power Receiver for Touch Communication and Touch Sensing
摘要： Intra-body and extra-body communication is an attractive wireless communication method for wearable devices and their applications. In this work, we present the architecture, the design and the implementation of a novel zero-power receiver optimized for intra-body and extra-body communication and on-off keying modulation. The receiver includes an energy-harvesting subsystem that extracts energy from the received message to supply the low power circuits. The proposed zero-power receiver is able to receive and to parse data, as well as wake up external logic when a specific address is detected. The receiver can be used both as an always-on touch sensor to be deployed in the field and as a body communication wake up radio to other nodes on the human body. Experimental results with in-field measurements demonstrate the zero-power of the proposed device and that it is possible to achieve more than 1.70m in intra-body communication and hand-shake information exchange without the use of any external battery.
关键词： Zero-Power sensing,Body communication,Wearable devices,Zero-Power communication,Low Power Design
更新于2025-09-10 09:29:36