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A Rapid Adaptation Approach for Dynamic Air‑Writing Recognition Using Wearable Wristbands with Self‑Supervised Contrastive Learning

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Nano-Micro Letters 2025年第2期17卷 417-431页

作者： Yunjian Guo Kunpeng Li Wei Yue Nam‑Young Kim Yang Li guozhen shen Jong‑Chul Lee Department of Electronic Convergence Engineering Kwangwoon UniversitySeoul 01897South Korea Radio Frequency Integrated Circuit(RFIC)Bio Centre Kwangwoon UniversitySeoul 01897South Korea Department of Electronic Engineering Kwangwoon UniversitySeoul 01897South Korea School of Microelectronics Shandong UniversityJinan 250101People’s Republic of China State Key Laboratory of Integrated Chips and Systems Fudan UniversityShanghai 200433People’s Republic of China School of Integrated Circuits and Electronics Beijing Institute of TechnologyBeijing 100081People’s Republic of China

Wearable wristband systems leverage deep learning to revolutionize hand gesture recognition in daily *** existing approaches that often focus on static gestures and require extensive labeled data,the proposed wearable wristband with selfsupervised contrastive learning excels at dynamic motion tracking and adapts rapidly across multiple *** features a four-channel sensing array composed of an ionic hydrogel with hierarchical microcone structures and ultrathin flexible electrodes,resulting in high-sensitivity capacitance *** wireless transmission from a Wi-Fi module,the proposed algorithm learns latent features from the unlabeled signals of random wrist ***,only few-shot labeled data are sufficient for fine-tuning the model,enabling rapid adaptation to various *** system achieves a high accuracy of 94.9%in different scenarios,including the prediction of eight-direction commands,and air-writing of all numbers and *** proposed method facilitates smooth transitions between multiple tasks without the need for modifying the structure or undergoing extensive task-specific *** utility has been further extended to enhance human–machine interaction over digital platforms,such as game controls,calculators,and three-language login systems,offering users a natural and intuitive way of communication.

关键词： Wearable wristband Self-supervised contrastive learning Dynamic gesture Air-writing Human-machine interaction

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Recent advances of flexible sensors for biomedical applications

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Progress in Natural Science:Materials International 2021年第6期31卷 872-882页

作者： guozhen shen State Key Laboratory for Superlattices and Microstructures Institute of Semiconductors Chinese Academy of Sciences

Ultrathin, soft, flexible and stretchable sensors offer good opportunity to design personal health diagnosis and treatment systems by fabricating wearable biomedical devices for continuous health monitoring and preventive medicine. This paper summarizes the recent advances of flexible sensors for next generation biomedical applications. Materials used for flexible sensors are first briefly introduced. Followed to this part, the latest developments of flexible sensors for biomedical applications are discussed in detail, including flexible sensors for skin-attached devices and implantable devices. Finally, the challenges and future research directions of flexible sensors are also discussed in the development of biomedical devices.

关键词： Flexible electronics Sensors Biomedical Electronic skins

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Writing perovskite optoelectronic devices with ballpoint pens

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Science China Materials 2023年第10期66卷 4135-4136页

作者： Ying Li guozhen shen School of Integrated Circuits and Electronics Beijing Institute of TechnologyBeijing 100081China Institute of Flexible Electronics Beijing Institute of TechnologyBeijing 102488China

Flexible optoelectronic devices have wide application prospects in wearable and portable electronic products because of their advantages of high power per unit weight,high flexibility and low cost[1,2].Traditional preparation processes of flexible device such as spin-coating,vacuum-based evaporation/sputtering and etching,yield high reproducibility and device performance[3,4].

关键词： perovskite optoelectronic portable

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Powering a wearable sweat biosensor for continuous and non-invasive monitoring using a flexible perovskite solar cell

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Science China Materials 2023年第9期66卷 3757-3758页

作者： Zuqing Yuan guozhen shen School of Integrated Circuits and Electronics Beijing Institute of TechnologyBeijing 100081China

The rapid growth of the Internet of Things(IoT) in recent years has spurred the progress of portable electronics. Wearable electronic devices have the capability to continuously monitor physical vital signs and biochemical markers [1,2]. Among these,wearable biosensors have the potential to analyze human epidermal sweat, which contains valuable information for disease diagnosis and fitness tracking, in a continuous and non-invasive manner.

关键词： wear portable diagnosis

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Enhancing the environmental durability and flexibility of polymer electronics through nanostructured molecular-level protection tethered to surfaces

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Science China Materials 2023年第8期66卷 3375-3376页

作者： Yang Li guozhen shen School of Microelectronics Shandong UniversityJinan 250101China School of Integrated Circuits and Electronics Beijing Institute of TechnologyBeijing 100081China

Flexible,biocompatible,and stretchable epidermal electronic devices possess remarkable capability to seamlessly interface with bionic biological systems and maintain reliable operation even during continuous body movements[1,2].Consequently,they hold immense promise for advanced wearable and implantable applications,encompassing real-time health monitoring,robotic intelligent sensing,and metaverse technologies.

关键词： durability maintain interface

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Wireless multisite sensing systems for continuous physiological monitoring

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Science China Materials 2024年第6期67卷 2045-2047页

作者： Ruilai Wei Qilin Hua guozhen shen School of Integrated Circuits and Electronics Beijing Institute of TechnologyBeijing 100081China Institute of Flexible Electronics Beijing Institute of TechnologyBeijing 102488China

Respiratory diseases rank as the third leading cause of adult mortality[1],while cardiopulmonary and gastrointestinal issues are the primary cause of death within the first five years of a child’s life[2].The monitoring of cardiac,respiratory,and gastrointestinal sounds plays a vital role in routine care,as alterations or absence of these body sounds can serve as indicators of underlying diseases.

关键词： routine continuous monitoring

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Electrical transport and photoresponse properties of single-crystalline p-type Cd_3As_2 nanowires

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Science China(Physics,Mechanics & Astronomy) 2015年第2期58卷 95-100页

作者： DUAN TingYuan LOU Zheng shen guozhen Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology State Key Laboratory for Superlattices and Microstructures Institute of Semiconductors Chinese Academy of Sciences

Cd3As2 is an important II-V group semiconductor with excellent electrical and optoelectronic properties. In this work, we report the large scale growth of single-crystalline Cd3As2 nanowires via a simple chemical vapor deposition method. Single nanowire field-effect transistors were fabricated with the as-grown Cd3As2 nanowires, which exhibited a high lon/loff of 104 with a hole mobility of 6.02 cm2V-1s-1. Photoresponse properties of the Cd3As2 nanowires were also investigated by illuminating the nanowires with white light by varying intensities. Besides, flexible photodetectors were also fabricated on flexible PET substrate, showing excellent mechanical stablility and flexible electro-optical properties under various bending states and bending cycles. Our results indicate that Cd3As2 nanowires can be the basic material of next generation electronic and ootoelectronic devices.

关键词： nanowires electrical transport photodetector

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Monolithically integrated low-voltage soft e-skins designed to emulate biological sensorimotor loop

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Science China Materials 2023年第11期66卷 4512-4514页

作者： Qilin Hua Haixing Meng guozhen shen School of Integrated Circuits and Electronics Beijing Institute of TechnologyBeijing 100084China Institute of Flexible Electronics Beijing Institute of TechnologyBeijing 102488China

Skin plays a pivotal role in the human body’s interaction with the external environment,enabling detection and response to sensory stimuli^([1,2]).However,skin damage can impede the sensorimotor system,with severe cases often requiring amputation and resulting in the inability to perform basic movements^([3]).While prosthetic limbs can aid in certain movement processes to a limited extent,they also possess constraints in terms of perception and flexibility.

关键词： Skin movement constraints

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Real-time monitoring of oxygenation in deep brain tissue using a wireless photoelectric probe

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Science China Materials 2024年第4期67卷 1361-1362页

作者： Hao Pang Qilin Hua guozhen shen School of Integrated Circuits and Electronics Beijing Institute of TechnologyBeijing 100084China Institute of Flexible Electronics Beijing Institute of TechnologyBeijing 102488China

Oxygen(O2) supply to the brain is of utmost importance for human health, as cerebral hypoxia can result in irreversible brain damage. Neurodegenerative diseases, such as epilepsy, are closely associated with cerebral hypoxia [1,2]. Real-time monitoring of cerebral oxygenation holds significant value in neuroscience research and clinical diagnostics [3–10].

关键词： epilepsy cerebral diseases

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CMOS-level mega-pixel organic camera chips made of photocrosslinked photovoltaic nanocells

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Science China Materials 2024年第9期67卷 3043-3045页

作者： Yegang Liang Zhuoran Wang guozhen shen School of Integrated Circuits and Electronics Beijing Institute of TechnologyBeijing100081China

Organic and hybrid optoelectronics have been driving the frontiers in displays,sensing,and energy in recent decades due to their superior performance,low-cost high-yield manufacturing,and new form factor of mechanical flexibility that is promising for lightweight and wearable applications[1-3].However,the inherent vulnerability makes organic semiconductors incompatible with conventional semiconductor microfabrication,posing significant challenges in high density integration to compete with the resolution of conventional image sensors[4].

关键词： frontier driving lightweight

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