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| 1 | Deep learning-enabled triboelectric smart socks for IoT-based gait analysis and VR applications显示文摘The era of artificial intelligence and internet of things is rapidly developed by recent advances in wearable electronics.Gait reveals sensory information in daily life containing personal information,regarding identification and healthcare.Current wearable electronics of gait analysis are mainly limited by high fabrication cost,operation energy consumption,or inferior analysis methods,which barely involve machine learning or implement nonoptimal models that require massive datasets for training.Herein,we developed low-cost triboelectric intelligent socks for harvesting waste energy from low-frequency body motions to transmit wireless sensory data.The sock equipped with self-powered functionality also can be used as wearable sensors to deliver information,regarding the identity,health status,and activity of the users.To further address the issue of ineffective analysis methods,an optimized deep learning model with an end-to-end structure on the socks signals for the gait analysis is proposed,which produces a 93.54%identification accuracy of 13 participants and detects five different human activities with 96.67%accuracy.Toward practical application,we map the physical signals collected through the socks in the virtual space to establish a digital human system for sports monitoring,healthcare,identification,and future smart home applications. | Zixuan Zhang Tianyiyi He Minglu Zhu Zhongda Sun Qiongfeng Shi Jianxiong Zhu Bowei Dong Mehmet Rasit Yuce Chengkuo Lee | 2020 | npj Flexible Electronics2020，4，1： | 4 |
| 2 | Quantum dot lasing from a waterproof and stretchable polymer film显示文摘Colloidal quantum dots(QDs)are excellent optical gain materials that combine high material gain,a strong absorption of pump light,stability under strong light exposure and a suitability for solution-based processing.The integration of QDs in laser cavities that fully exploit the potential of these emerging optical materials remains,however,a challenge.In this work,we report on a vertical cavity surface emitting laser,which consists of a thin film of QDs embedded between two layers of polymerized chiral liquid crystal.Forward directed,circularly polarized defect mode lasing under nanosecond-pulsed excitation is demonstrated within the photonic band gap of the chiral liquid crystal.Stable and long-term narrow-linewidth lasing of an exfoliated free-standing,flexible film under water is obtained at room temperature.Moreover,we show that the lasing wavelength of this flexible cavity shifts under influence of pressure,strain or temperature.As such,the combination of solution processable and stable inorganic QDs with high chiral liquid crystal reflectivity and effective polymer encapsulation leads to a flexible device with long operational lifetime,that can be immersed in different protic solvents to act as a sensor. | Mohammad Mohammadimasoudi Pieter Geiregat Frederik Van Acker Jeroen Beeckman Zeger Hens Tangi Aubert Kristiaan Neyts | 2022 | Light(Science & Applications)2022，11，10： | 0 |
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