A5071986213- Advanced Sensor and Energy Harvesting Materials
- Gas Sensing Nanomaterials and Sensors
- Tactile and Sensory Interactions
- Analytical Chemistry and Sensors
- Advanced Chemical Sensor Technologies
- Nanowire Synthesis and Applications
- Interactive and Immersive Displays
- Non-Invasive Vital Sign Monitoring
- Advanced MEMS and NEMS Technologies
- Microstructure and Mechanical Properties of Steels
- Nanomaterials and Printing Technologies
- Hydrogen embrittlement and corrosion behaviors in metals
- Semiconductor Lasers and Optical Devices
- Voice and Speech Disorders
- Concrete Corrosion and Durability
- Caching and Content Delivery
- Ammonia Synthesis and Nitrogen Reduction
- Thermal Regulation in Medicine
- Innovative Energy Harvesting Technologies
- Advanced Thermoelectric Materials and Devices
- Thermal Radiation and Cooling Technologies
- Energy Harvesting in Wireless Networks
- Metal Alloys Wear and Properties
- Non-Destructive Testing Techniques
- Corrosion Behavior and Inhibition
Northwestern University
2021-2025
Sungkyunkwan University
2023-2025
Korea Advanced Institute of Science and Technology
1993-2024
Yonsei University
2022
Daejeon University
2019
Government of the Republic of Korea
2019
Hanyang University
2014
Pohang Iron and Steel (South Korea)
2002-2010
Korea Military Academy
2009
Kwangwoon University
2009
Temporary postoperative cardiac pacing requires devices with percutaneous leads and external wired power control systems. This hardware introduces risks for infection, limitations on patient mobility, requirements surgical extraction procedures. Bioresorbable pacemakers mitigate some of these disadvantages, but they demand pairing external, systems secondary mechanisms control. We present a transient closed-loop system that combines time-synchronized, wireless network skin-integrated an...
Abstract Variations in parameters associated with the ambient environment can introduce noise soft, body-worn sensors. For example, many piezoresistive pressure sensors exhibit a high degree of sensitivity to fluctuations temperature, thereby requiring active compensation strategies. The research presented here addresses this challenge multilayered 3D microsystem design that integrates four full-Wheatstone bridge configuration. An optimized layout relative neutral mechanical plane leads both...
Abstract Recently, copper oxide (CuO)-based visible-light photodetectors have attracted great interest due to their narrow bandgap (1.2 eV), low cost, and ease of fabrication. However, there has been insufficient theoretical analysis study CuO-based photodetectors, resulting in inferior performance terms responsivity, detectivity, response speed. This work develops a method enhance the CuO by engineering grain structure based on newly-developed model. In developed grain-structure model, size...
Swallowing is a complex neuromuscular activity regulated by the autonomic nervous system. Millions of adults suffer from dysphagia (impaired or difficulty swallowing), including patients with neurological disorders, head and neck cancer, gastrointestinal diseases, respiratory disorders. Therapeutic treatments for include interventions speech-language pathologists designed to improve physiology swallowing mechanism training initiate swallows sufficient frequency during expiratory phase...
Thermal sensations contribute to our ability perceive and explore the physical world. Reproducing these in a spatiotemporally programmable manner through wireless computer control could enhance virtual experiences beyond those supported by video, audio and, increasingly, haptic inputs. Flexible, lightweight thin devices that deliver patterns of thermal stimulation across large areas skin at any location body are great interest this context. Applications range from gaming remote...
Abstract Electrochemical nitrate reduction reaction (NO 3 RR) has garnered increasing attention as a pathway for converting harmful pollutant (nitrate) into value‐added product (ammonia). However, high selectivity toward ammonia (NH ) is imperative process viability. Optimizing proton availability near the catalyst important achieving selective NH production. Here, aim to systematically examine impacts of on NO RR in bipolar membrane (BPM)‐based electrode assembly (MEA) system. The BPM...
Abstract Force touch sensors have received a great deal of attention for various applications owing to their versatile ability detect and pressure. To demonstrate high‐performance force sensors, numerous studies been performed, focusing on high sensitivity, transparency, mechanical durability against bending. However, it is still challenging apply in flexible applications, because sensing performance subject change degraded by induced stress deformation when the device bent. Here,...
Vocal fatigue is a measurable form of performance resulting from overuse the voice and characterized by negative vocal adaptation. dose refers to cumulative exposure fold tissue vibration. Professionals with high demands, such as singers teachers, are especially prone fatigue. Failure adjust habits can lead compensatory lapses in technique an increased risk injury. Quantifying recording inform individuals about potential important step toward mitigating Previous work establishes dosimetry...
Partial cystectomy procedures for urinary bladder–related dysfunction involve long recovery periods, during which urodynamic studies (UDS) intermittently assess lower tract function. However, UDS are not patient-friendly, they exhibit user-to-user variability, and amount to snapshots in time, limiting the ability collect continuous, longitudinal data. These also pose risk of catheter-associated infections, can progress ascending pyelonephritis due prolonged manipulation high-risk patients....
With the escalating global awareness of air quality management, need for continuous and reliable monitoring toxic gases by using low-power operating systems has become increasingly important. One which, semiconductor metal oxide gas sensors have received great attention due to their high/fast response simple working mechanism. More specifically, self-heating sensors, wherein direct thermal activation in sensing material, been sought low power-consuming characteristics. However, previous...
Nanowire (NW) transfer technology has provided promising strategies to realize future flexible materials and electronics. Using this technology, geometrically controlled, high-quality NW arrays can now be obtained easily on various substrates with high throughput. However, it is still challenging extend a wide range of high-performance device applications because its limited temperature tolerance precludes the use high-temperature annealing, which essential for crystallization...
This study proposes a reliable and self-powered hydrogen (H2) gas sensor composed of chemo-mechanically operating nanostructured film photovoltaic cell. Specifically, the has configuration in which an asymmetrically coated palladium (Pd) is on periodic polyurethane acrylate (PUA) nanograting. The asymmetric Pd nanostructures, optimized by finite element method simulation, swell upon reacting with H2 thereby bend PUA nanograting, changing amount transmitted light current output Since degree...
Significance Early detection of infant neuromotor pathologies is critical for timely therapeutic interventions that rely on early-life neuroplasticity. Traditional assessments subjective expert evaluations or specialized medical facilities, making them challenging to scale in remote and/or resource-constrained settings. The results presented here aim democratize these using wireless networks miniaturized, skin-integrated sensors digitize movement behaviors and vital signs infants a...
Recently reported winged microelectronic systems offer passive flight mechanisms as a dispersal strategy for purposes in environmental monitoring, population surveillance, pathogen tracking, and other applications. Initial studies indicate potential technologies of this type, but advances structural responsive materials aerodynamically optimized geometries are necessary to improve the functionality expand modes operation. Here, we introduce environmentally degradable basis 3D fliers that...
The high explosiveness of hydrogen gas in the air necessitates prompt detection settings where is used. For this reason, sensors are required to offer rapid and possess superior sensing characteristics terms measurement range, linearity, selectivity, lifetime, environment insensitivity according publicized protocol. However, previous approaches have only partially achieved standardized requirements been limited their capability develop reliable materials for spatially accessible systems....
Palladium (Pd) has been drawing increasing attention as a hydrogen (H2) detecting material due to its highly selective sensitivity H2. However, at H2 concentrations above 2%, Pd undergoes an inevitable phase transition, causing undesirable electrical and mechanical alterations. In particular, nonlinear gas response (ΔR/R0) that accompanies transition great bottleneck for in high concentrations, which is especially important there risk of explosion over 4% Here, we propose...
Engineered heart tissues (EHTs) generated from human induced pluripotent stem cell–derived cardiomyocytes (hiPSC-CMs) represent powerful platforms for cardiac research, especially in drug testing and disease modeling. Here, we report a flexible, three-dimensional electronic framework that enables real-time, spatiotemporal analysis of electrophysiologic mechanical signals EHTs under physiological loading conditions dynamic, noninvasive, longer-term assessments. These electromechanically...
A method for designing nanoscale heating structures effectively addresses both thermal conduction and convective heat loss. Nanowire-based heaters demonstrate superior efficiency over traditional thin-film under atmospheric conditions.
Pressure sensors provide intuitive and easy-to-use information, making them essential for Human-Machine Interface (HMI) applications. However, capacitive pressure sensors, although prevalent in industrial applications, suffer from critical vulnerabilities to external interferences like water droplets proximity. Without addressing these issues, can never be effectively utilized various real-world This paper addresses this issue by identifying fringe fields as the primary cause of interference...
Abstract Real-time sensory signal monitoring systems are crucial for continuous health tracking and enhancing human-interface technologies in virtual reality/augmented reality applications. Recent advancements micro/nanofabrication have enabled wearable implantable sensors to achieve sufficient sensitivity measuring subtle signals, while integration with wireless communication allows real-time closed-loop user feedback. However, highly sensitive sensing materials face challenges, as their...