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[IEEE 2018 7th Electronic System-Integration Technology Conference (ESTC) - Dresden, Germany (2018.9.18-2018.9.21)] 2018 7th Electronic System-Integration Technology Conference (ESTC) - Hybrid (PI-PDMS) Superhydrophobic Wearable Dry-Patching Flexible and Transparent Substrate
摘要： The hybrid thin film is fabricated by using polyimide (PI) and Polydimethylsiloxane (PDMS) to take combined advantages of their transparency, thermal stability and stretchability. Furthermore, another importance of such subtract is superhydrophobicity, having highly water repellent, dustproof and self-cleaning effect which is beneficial for its long-term performance. The demand for dry patching has been increased as compared with wet patching films due to optical transmittance and long term optimization, the patching devices mechanism for those devices can be mechanical deformation experienced with bending, pressing, twisting and pressing, without any compromise on the comfort of the user, those mechanical characteristics leads towards the adhesion of the substrate via van der Waals force without using any wet adhesion. The actively explored field of flexible and wearable applications are in healthcare and artificial electronic skins which are interestingly capable of detecting stress, strain, pain and temperature in real-time health monitoring. Since superhydrophobic properties combine with dry patching techniques provide a wide range of practical applications for the platform of the wearable dry patching substrate, it is expected that such works have an impact on flexible hybrid electronic (FHE) devices which can be rolled, stretched patching superhydrophobic substrate utilizing a polymer casting method showing a static CA and CAH angle of 179° and 10°, respectively, by creating the air pocket between the micro pillars (30μm) which counterbalances the water droplet on the surface. Such hybrid in microelectronics applications; it provides more desirable properties in many fields of application (mechanical, thermal, optical and chemical). In this article, we discussed the fabrication of a dry-patching substrate using hybrid film that has a superhydrophobic surface substrates are widely used bent. The fabricated and dry.
关键词： Wearable Devices,Dry Patching,Flexible,Self-Cleaning,Superhydrophobic,Low Hysteresis
更新于2025-09-23 15:19:57
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Metal Mesh as a Transparent Omnidirectional Strain Sensor
摘要： Metal Mesh as a Transparent Omnidirectional Strain Sensor Weixin Zhou, Yi Li,* Pan Li, Jun Chen, Rongqing Xu,* Shanshan Yao, Zheng Cui, Ronald Booth, Baoxiu Mi, Dan Wang, Yanwen Ma,* and Wei Huang Thin metal films can be engineered to fabricate strain sensors by conquering their stiffness using wavy, buckle, or wrinkle topography. However, these structures usually operate in uniaxial or biaxial stretching directions, limiting their application in the omnidirectional model. Here a strain sensor is con- structed by using metal mesh with honeycomb lattices and multiple domains as the sensitive unit, which simultaneously provides good stretchability and direction independence. Besides, the metal mesh structure makes it possible to obtain a transparent sensor with a sheet resistance of 26 Ω sq?1 at a trans- mittance of 79%. The sensor exhibits a highly sensitive resistance change with tension strain, demonstrated by quick response when monitoring the finger and muscle motion. The sensor also shows promising potential application in detecting periodic oscillation with selected frequency and even complex mechanical oscillation like glass vibration.
关键词： breath-figure,wearable devices,strain sensors,transparent stretchable electronics,omnidirectional detection
更新于2025-09-19 17:15:36
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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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[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
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Stretchable Conjugated Polymers: A Case Study in Topic Selection for New Research Groups
摘要： The field of π-conjugated (semiconducting) polymers has been underwritten largely because of the promise of flexible (and increasingly, stretchable) devices for energy and health care. Our research group has spent much of the past six years studying the mechanical properties of conjugated polymers. Mechanically robust materials can extend the life spans of devices such as solar cells and organic light-emitting diode (OLED) panels and enable high throughput processing techniques such as roll-to-roll printing. Additionally, wearable and implantable devices, including electronic skin, implantable pressure sensors, and haptic actuators, benefit by having moduli and extensibilities close to those of biological tissue. At the time of our laboratory’s inception, however, the optoelectronic properties of conjugated polymers were understood in much greater depth than their mechanical properties. We therefore set out, as our laboratory’s first research topic, to understand the molecular and microstructural determinants of the mechanical properties of conjugated polymers. This is an Account not only of our scientific findings but also of the pragmatic aspects, including personnel, funding, and time constraints, behind our studies as a nascent research group. We hope that this Account will provide information to newly independent scientists about the process of starting a new research laboratory.
关键词： π-conjugated polymers,stretchable electronics,organic semiconductors,mechanical properties,wearable devices
更新于2025-09-10 09:29:36
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[IEEE 2018 40th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC) - Honolulu, HI (2018.7.18-2018.7.21)] 2018 40th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC) - Kick LL: A Smartwatch for Monitoring Respiration and Heart Rate using Photoplethysmography
摘要： With the growing popularity of wearable devices in the consumer space, interest in leveraging this technological platform in the medical field is rising. In this report, we describe a smartwatch capable of measuring respiration and heart rate using photoplethysmography (PPG). The device couples a photosensor, specifically tuned bandpass filters, and frequency content analysis to extract respiration and heart rate from the PPG signal. The results from the experimental device were compared to a commercial chest strap heart rate monitor. Respiratory rate measurements agreed within 1 breath per minute and heart rate measurements agreed within 3-4 beats per minute of the reference device. Furthermore, the device was packaged in an untethered wristwatch allowing for real-time measurements and analysis.
关键词： heart rate,respiration rate,smartwatch,photoplethysmography,wearable devices
更新于2025-09-09 09:28:46
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[IEEE 2018 24th International Conference on Pattern Recognition (ICPR) - Beijing, China (2018.8.20-2018.8.24)] 2018 24th International Conference on Pattern Recognition (ICPR) - Variational Mode Decomposition-Based Heart Rate Estimation Using Wrist-Type Photoplethysmography During Physical Exercise
摘要： Heart rate (HR) monitoring based on Photoplethysmography (PPG) has drawn increasing attention in modern wearable devices due to its simple hardware implementation and low cost. In this work, we propose a variational mode decomposition (VMD)-based HR estimation method using wrist-type PPG signals during physical exercise. To remove motion artifacts (MA), VMD was first used and then a post-processing method after VMD was proposed to guarantee the robustness of MA removal. The performance of our proposed method was evaluated on two PPG datasets used in 2015 IEEE Signal Processing Cup. The method achieved the average absolute error of 1.45 beat per minute (BPM) on the 12 training sets and 3.19 BPM on the 10 testing sets, confirmed by the experimental results.
关键词： Photoplethysmography (PPG),Heart rate monitoring,variational mode decomposition,motion artifacts,wearable devices
更新于2025-09-09 09:28:46
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[IEEE 2018 40th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC) - Honolulu, HI (2018.7.18-2018.7.21)] 2018 40th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC) - A 5-ms Error, 22-μA Photoplethysmography Sensor using Current Integration Circuit and Correlated Double Sampling
摘要： This paper presents a low-power Photoplethysmography (PPG) sensing method. The PPG is commonly used in recent wearable devices to detect cardiovascular information including heartbeat. The heartbeat is useful for physical activity and stress monitoring. However, the PPG circuit consumes large power because it consists of LED and photodiode. To reduce its power consumption without accuracy degradation, a cooperative design of circuits and algorithms is proposed in this work. A straightforward way to reduce the power is intermittent driving of LED, but there is a disadvantage that the signal is contaminated by a noise while circuit switching. To overcome this problem, we introduce correlated double sampling (CDS) method, which samples an integration circuit output twice with short intervals after the LED turns on and uses the difference of these voltage. Furthermore, an up-conversion method using linear interpolation, and an error correction using autocorrelation are introduced. The proposed PPG sensor, which consists of the LED, the photodiode, the current integration circuit, a CMOS switch, an A/D converter, and an MCU, is prototyped. It is evaluated by actual measurement with 22-year-old subject. The measurement results show that 22-μA total current consumption is achieved with 5-ms mean absolute error.
关键词： wearable devices,low-power,heartbeat monitoring,Photoplethysmography (PPG),autocorrelation,correlated double sampling (CDS)
更新于2025-09-04 15:30:14