유재영 교수

Abstract Force touch sensors have received a great deal of attention for various applications owing to their versatile ability to detect touch and pressure. To demonstrate high‐performance force touch sensors, numerous studies have been performed, focusing on high sensitivity, transparency, and mechanical durability against bending. However, it is still challenging to apply force touch sensors in flexible applications, because their sensing performance is subject to change and degraded by induce

The sense of touch conveys critical environmental information, facilitating object recognition, manipulation, and social interaction, and can be engineered through haptic actuators that stimulate cutaneous receptors. An unfulfilled challenge lies in haptic interface technologies that can engage all the various mechanoreceptors in a programmable, spatiotemporal fashion across large areas of the body. Here, we introduce a small-scale actuator technology that can impart omnidirectional, superimposa

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 for technologies of this type, but advances in structural and responsive materials and in aerodynamically optimized geometries are necessary to improve the functionality and expand the modes of operation. Here, we introduce environmentally degradable

Sensations of heat and touch produced by receptors in the skin are of essential importance for perceptions of the physical environment, with a particularly powerful role in interpersonal interactions. Advances in technologies for replicating these sensations in a programmable manner have the potential not only to enhance virtual/augmented reality environments but they also hold promise in medical applications for individuals with amputations or impaired sensory function. Engineering challenges a

Abstract Recently, flexible electronics have attracted significant attention as they can be integrated on diverse platforms from curved to flexible surfaces. As flexible electronics are used on a curved surface of wearable or manufacturing devices for health and system monitoring, the working environment of such applications forces electronics to be exposed to diverse stimuli such as deformation, temperature, humidity, and gas, resulting in performance changes. Therefore, rather than research on

Ammonia (NH 3 ) is emerging as a promising carbon-free chemical energy source, offering higher storage capacity per unit volume compared to hydrogen and enhanced ease of liquefaction. This makes NH 3 suitable for long-distance transportation and various industrial applications. The ammonia oxidation reaction (AOR) is crucial for electrochemically converting NH 3 into H 2, but current AOR catalysts face commercialization challenges due to cost and efficiency issues. This study explores ways to en

Increasing the electrochemically active surface area (ECSA) and alloying Pt with transition metals (TMs) are well-known strategies for enhancing the oxygen reduction reaction (ORR) catalytic activities. Herein, we introduce a strategy to produce highly active ORR electrocatalysts with a large ECSA using an electrochemical dealloying process involving leaching of Ni from a Ni-rich Pt–Ni nanoparticle network. The dealloying process yielded a dealloyed Pt–Ni nanoparticle network with rugged surface

The increasing demand for motion tracking systems has been accelerated by advancements in virtual reality (VR) and motion reconstruction technologies. Combined with emerging innovations in the Internet of Things (IoT), these systems have unlocked transformative applications, from immersive user experiences to personalized healthcare solutions. However, conventional motion tracking systems often fall short of delivering sophisticated tracking and feedback capabilities, while systems designed for

Diverse body processes such as those related to respiration and digestion generate characteristic sounds and mechanical vibrations.1-3 Quantitative measurements of these phenomena hold invaluable clinical information regarding activity of the cardiopulmonary system, flow of air into/out of the lungs and blood through arteries/veins, ingestion and swallowing of liquid and solids, and motility of matter through the stomach and intestines.4-6 Historically, the stethoscope has played a crucial role

In this paper, we propose a method to solve the image restoration problem, which tries to restore the details of a corrupted image, especially due to the loss caused by JPEG compression. We have treated an image in the frequency domain to explicitly restore the frequency components lost during image compression. In doing so, the distribution in the frequency domain is learned using the cross entropy loss. Unlike recent approaches, we have reconstructed the details of an image without using the s

Abstract Flexible pressure sensors have emerged as indispensable components in advancing wearable electronics, healthcare systems, and next‐generation human‐machine interfaces. To enable these applications, significant progress has been made in improving the sensitivity of flexible pressure sensors. However, achieving bending insensitivity—crucial for reliable pressure detection under dynamic and curved conditions—remains a critical challenge. In this study, a high‐performance flexible capacitiv