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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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Compact and Low-Profile UWB Antenna Based on Graphene-Assembled Films for Wearable Applications
摘要： In this article, a graphene-assembled ?lm (GAF)-based compact and low-pro?le ultra-wide bandwidth (UWB) antenna is presented and tested for wearable applications. The highly conductive GAFs (~106 S/m) together with the ?exible ceramic substrate ensure the ?exibility and robustness of the antenna, which are two main challenges in designing wearable antennas. Two H-shaped slots are introduced on a coplanar-waveguide (CPW) feeding structure to adjust the current distribution and thus improve the antenna bandwidth. The compact GAF antenna with dimensions of 32 × 52 × 0.28 mm3 provides an impedance bandwidth of 60% (4.3–8.0 GHz) in simulation. The UWB characteristics are further con?rmed by on-body measurements and show a bending insensitive bandwidth of ~67% (4.1–8.0 GHz), with the maximum gain at 7.45 GHz being 3.9 dBi and 4.1 dBi in its ?at state and bent state, respectively. Our results suggest that the proposed antenna functions properly in close proximity to a human body and can sustain repetitive bending, which make it well suited for applications in wearable devices.
关键词： wearable antenna,UWB,CPW,graphene-assembled ?lm
更新于2025-09-23 15:21:01
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[IEEE SoutheastCon 2018 - St. Petersburg, FL (2018.4.19-2018.4.22)] SoutheastCon 2018 - Advanced Nanomaterials for Bio-Monitoring
摘要： Biomedical and diagnostic detection/monitoring are of great importance to society, as these areas directly impact our daily lives. This need is prevalent in the workings of wearable biosensors, as the biosensor market is projected to be a $US 22.5 billion dollar industry by 2020. Hence, the development of sensors utilizing the often enhanced properties of nanoscale materials is at the forefront of wearable analytical chemistry. Nanoscience presents an almost endless amount of novel materials, as their properties differ from their bulk counterparts. Many of the interactions with these nanomaterials remain unexplored, leaving a need for investigation. Both the structure and the materials should be soft and mechanically robust enough to bend, stretch, fold, and twist in response to the motion of the wearer. Here, electrospun polymer fibers have been used as wearable sensors, and further functionalized with a wide loading range of carbon nanomaterials via layer-by-layer and vacuum techniques to accommodate multiple analyte detection schemes in sweat. The data demonstrates the success of a nanocomposite sensor at monitoring in an accurate, selective, and reproducible manner. It is capable of outputting currents, at low voltages (< 1 V), that can easily be read via a portable/wearable device, enhancing the sensor’s attractiveness for wearable/flexible devices.
关键词： nanomaterials,advanced materials,wearable,nanosensors,biosensors
更新于2025-09-23 15:21:01
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Mushroom-like nanowires stand up for elastronics
摘要： A dense forest of mushroom-like gold nanowires grown on soft, flexible substrates could enable a new generation of wearable or implantable stretchable electronic devices, believe researchers [Wang et al., ACS Nano (2018), DOI: 10.1021/acsnano.8b05019 https://doi.org/10.1021/acsnano.8b05019]. Elastronics – electronic devices that can bend and flex repeatedly without impacting on performance – are ideally suited to on-the-skin monitoring or diagnostic applications.
关键词： elastronics,gold nanowires,stretchable electronics,wearable devices
更新于2025-09-23 15:21:01
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Organic Transistor-Based Chemical Sensors for Wearable Bioelectronics
摘要： Bioelectronics for healthcare that monitor the health information on users in real time have stepped into the limelight as crucial electronic devices for the future due to the increased demand for “point-of-care” testing, which is defined as medical diagnostic testing at the time and place of patient care. In contrast to traditional diagnostic testing, which is generally conducted at medical institutions with diagnostic instruments and requires a long time for specimen analysis, point-of-care testing can be accomplished personally at the bedside, and health information on users can be monitored in real time. Advances in materials science and device technology have enabled next-generation electronics, including flexible, stretchable, and biocompatible electronic devices, bringing the commercialization of personalized healthcare devices increasingly within reach, e.g., wearable bioelectronics attached to the body that monitor the health information on users in real time. Additionally, the monitoring of harmful factors in the environment surrounding the user, such as air pollutants, chemicals, and ultraviolet light, is also important for health maintenance because such factors can have short- and long-term detrimental effects on the human body. The precise detection of chemical species from both the human body and the surrounding environment is crucial for personal health care because of the abundant information that such factors can provide when determining a person’s health condition. In this respect, sensor applications based on an organic-transistor platform have various advantages, including signal amplification, molecular design capability, low cost, and mechanical robustness (e.g., flexibility and stretchability).
关键词： organic transistor-based chemical sensors,health monitoring,wearable bioelectronics,environmental monitoring,point-of-care testing
更新于2025-09-23 15:21:01
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[IEEE 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Chicago, IL, USA (2019.6.16-2019.6.21)] 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Synchrotron and optical probing of hybrid organic-inorganic perovskite halides for photovoltaics
摘要： Supporting high data rate wireless connectivity among wearable devices in a dense indoor environment is challenging. This is primarily due to bandwidth scarcity when many users operate multiple devices simultaneously. The millimeter-wave (mmWave) band has the potential to address this bottleneck, thanks to more spectrum and less interference because of signal blockage at these frequencies. In this paper, we explain the potential and challenges associated with using mmWave for wearable networks. To provide a means for concrete analysis, we present a system model that admits easy analysis of dense, indoor mmWave wearable networks. We evaluate the performance of the system while considering the unique propagation features at mmWave frequencies, such as human body blockages and re?ections from walls. One conclusion is that the non-isotropy of the surroundings relative to a reference user causes variations in system performance depending on the user location, body orientation, and density of the network. The impact of using antenna arrays is quanti?ed through analytic closed-form expressions that incorporate antenna gain and directivity. It is shown that using directional antennas, positioning the transceiver devices appropriately, and orienting the human user body in certain directions depending on the user location result in gigabits-per-second achievable ergodic rates for mmWave wearable networks.
关键词： personal communication networks,wearable computers,signal to noise ratio,Millimeter wave communication,performance analysis,analytic models,indoor communication,internet of things,virtual reality
更新于2025-09-23 15:19:57
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A photovoltaic textile design with a stainless steel mesh fabric
摘要： Solar energy is one of the most popular energy sources among the other renewable energies. Photovoltaic technology is a clean way to generate electricity from sunlight. Flexible photovoltaics enable portable electronic devices to power at off-grid conditions. Stainless steel mesh fabric was used as a substrate and electrode allowing the light to reach the photoactive layer. The photoactive layer and hole transport layer were deposited by the means of dip-coating like in the textile industry. The metal back electrode was evaporated in a thermal evaporator under vacuum. Promising results were obtained from photovoltaic measurements. About 0.69% power conversion efficiency was obtained from textile-based solar cells in this study. The textile-based metal fabric enables a flexible photovoltaic structure that can be integrated on non-planar surfaces to generate electricity, and also mesh structure allows the light to reach the photoactive layer.
关键词： solar textiles,conductive fabric,flexible photovoltaics,organic photovoltaics,Wearable electronics
更新于2025-09-23 15:19:57
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Recent Advances in Fiber-Shaped and Planar-Shaped Textile Solar Cells
摘要： During the last few years, textile solar cells with planar and fiber-shaped configurations have attracted enormous research interest. These flexible-type solar cells have a huge potential applicability in self-powered and battery-less electronics, which will impact many sectors, and particularly the Internet of Things. Textile solar cells are lightweight, super-flexible, formable, and foldable. Thus, they could be ideal power-harvester alternatives to common flexible solar cells required in smart textiles, electronic textiles, and wearable electronic devices. This review presents a brief overview on fiber-shaped and planar-shaped solar cells, and it introduces the most recent research reports on the different types of textile solar cells, including details on their fabrication techniques. It also addresses the current challenges and limitations of their technology development, and the encountered issues for their future application and integration in novel devices.
关键词： Electronic textiles,Smart textiles,Textile solar cells,Power harvesting,Fiber-shaped solar cells,Wearable electronic devices
更新于2025-09-23 15:19:57
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[IEEE 2019 Compound Semiconductor Week (CSW) - Nara, Japan (2019.5.19-2019.5.23)] 2019 Compound Semiconductor Week (CSW) - Blue (In, Ga)N Light-Emitting Diodes with Buried $\boldsymbol{n}^{+}-\boldsymbol{p}^{+}$ Tunnel Junctions by Plasma-Assisted Molecular Beam Epitaxy
摘要： Recent advances in biosensors, medical instrumentation, and information processing and communication technologies (ICT) have enabled significant improvements in healthcare. However, these technologies have been mainly applied in clinical environments, such as hospitals and healthcare facilities, under managed care by well-trained and specialized individuals. The global challenge of providing quality healthcare at affordable cost leads to the proposed paradigm of Preventive, Personalized, and Precision Medicine that requires a seamless use of technology and infrastructure support for patients and healthcare providers at point-of-care (POC) locations including homes, semi or pre-clinical facilities, and hospitals. The complexity of the global healthcare challenge necessitates strong collaborative interdisciplinary synergies involving all stakeholder groups including academia, federal research institutions, industry, regulatory agencies, and clinical communities. It is critical to evolve with collaborative efforts on the translation of research to technology development toward clinical validation and potential healthcare applications. This special issue is focused on technology innovation and translational research for POC applications with potential impact in improving global healthcare in the respective areas. Some of these papers were presented at the NIH-IEEE Strategic Conference on Healthcare Innovations and POC Technologies for Precision Medicine (HI-POCT) held at the NIH on November 9–10, 2015. The papers included in the Special Issue provide a spectrum of critical issues and collaborative resources on translational research of advanced POC devices and ICT into global healthcare environment.
关键词： medical devices,personalized medicine,home based monitoring,patient monitoring,Point-of-care technologies,healthcare innovation,medical informatics,wearable devices,preventive medicine,precision medicine
更新于2025-09-23 15:19:57
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[IEEE 2019 Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall) - Xiamen, China (2019.12.17-2019.12.20)] 2019 Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall) - Flexible Spoof Plasmonic Microfluidic Sensor for Detecting Liquid Solutions
摘要： Evaluating patient progress and making discharge decisions regarding inpatient medical rehabilitation rely upon the standard clinical assessments administered by trained clinicians. Wearable inertial sensors can offer more objective measures of patient movement and progress. We undertook a study to investigate the contribution of wearable sensor data to predict discharge functional independence measure (FIM) scores for 20 patients at an inpatient rehabilitation facility. The FIM utilizes a seven-point ordinal scale to measure patient independence while performing several activities of daily living, such as walking, grooming, and bathing. Wearable inertial sensor data were collected from ecological ambulatory tasks at two time points mid-stay during inpatient rehabilitation. Machine learning algorithms were trained with sensor-derived features and clinical information obtained from medical records at admission to the inpatient facility. While models trained only with clinical features predicted discharge scores well, we were able to achieve an even higher level of prediction accuracy when also including the wearable sensor-derived features. Correlations as high as 0.97 for leave-one-out cross validation predicting discharge FIM motor scores are reported.
关键词： prediction,machine learning,Rehabilitation monitoring,signal processing,wearable sensors
更新于2025-09-23 15:19:57
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The Influence of Laser Modification on a Composite Substrate and the Resistance of Thin Layers Created Using the PVD Process
摘要： For physical vapor deposition (PVD) technology, cleaning a substrate is one of the key preliminary processes before depositing the metal layer. In this article, we present the results of research on the modification of a textile composite substrate using laser technology and its influence on the surface resistance of silver structures intended for use in wearable electronics. As a result of the substrate modification, the resistance of the layers increased as compared with the structures produced on an unmodified substrate. An experimental planning technique was used to optimize the laser modification process.
关键词： wearable electronics,textronics,design of experiments,physical vapor deposition,laser modification,PVD
更新于2025-09-23 15:19:57