A5008309794- Advanced Sensor and Energy Harvesting Materials
- Cellular Mechanics and Interactions
- 3D Printing in Biomedical Research
- Tactile and Sensory Interactions
- Conducting polymers and applications
- Neuroscience and Neural Engineering
- Microfluidic and Bio-sensing Technologies
- Biometric Identification and Security
- EEG and Brain-Computer Interfaces
- Photoacoustic and Ultrasonic Imaging
- Photoreceptor and optogenetics research
- Spectroscopy and Chemometric Analyses
- Molecular Communication and Nanonetworks
- Dielectric materials and actuators
- Advanced Materials and Mechanics
- Gas Sensing Nanomaterials and Sensors
- Spectroscopy Techniques in Biomedical and Chemical Research
- User Authentication and Security Systems
- Sensor Technology and Measurement Systems
- Heart Rate Variability and Autonomic Control
- Gait Recognition and Analysis
- Micro and Nano Robotics
- Nanofabrication and Lithography Techniques
- Muscle activation and electromyography studies
- Interactive and Immersive Displays
Sookmyung Women's University
2021-2024
Stanford University
2010-2021
Electronics and Telecommunications Research Institute
2015-2020
Convergence
2017
Government of the Republic of Korea
2017
Cardiovascular Institute of the South
2011-2012
An ultrahigh sensitive capacitive pressure sensor based on a porous pyramid dielectric layer (PPDL) is reported. Compared to that of the conventional layer, sensitivity was drastically increased 44.5 kPa-1 in range <100 Pa, an unprecedented for sensors. The enhanced attributed lower compressive modulus and larger change effective constant under pressure. By placing sensors islands hard elastomer embedded soft substrate, exhibited insensitivity strain. were also nonresponsive temperature....
Tactile sensors that can mechanically decouple, and therefore differentiate, various tactile inputs are highly important to properly mimic the sensing capabilities of human skin. Herein, we present an all-solution processable pressure insensitive strain sensor utilizes difference in structural change upon application tensile strain. Under strain, microcracks occur within multiwalled carbon nanotube (MWCNT) network, inducing a large resistance with gauge factor ∼56 at 70% On other hand, under...
Traditionally, electronics have been designed with static form factors to serve designated purposes. This approach has an optimal direction for maintaining the overall device performance and reliability targeted applications. However, capable of changing their shape, flexibility, stretchability will enable versatile accommodating systems more diverse Here, we report design concepts, materials, physics, manufacturing strategies that these reconfigurable electronic based on...
Photoacoustic spectroscopy has been shown to be a promising tool for non-invasive blood glucose monitoring. However, the repeatability of such method is susceptible changes in skin condition, which dependent on hand washing and drying due high absorption infrared excitation light secretion products or water. In this paper, we present meet challenges mid-infrared photoacoustic By obtaining microscopic spatial information during measurement, region where spectra insensitive condition can...
Abstract Sensor‐to‐sensor variability and high hysteresis of composite‐based piezoresistive pressure sensors are two critical issues that need to be solved enable their practical applicability. In this work, a sensor composed an elastomer template with uniformly sized arranged pores, chemically grafted conductive polymer film on the surface pores is presented. Compared randomly which had coefficient variation (CV) in relative resistance change 69.65%, our exhibit much higher uniformity CV...
Electronic skin are devices that mimic the functionalities of human skin, which require high sensitivity, large dynamic range, spatial uniformity, low-cost and large-area processability, capacity to differentiate various external inputs. We herein introduce a versatile droplet-based microfluidic-assisted emulsion self-assembly process generate three-dimensional microstructure-based high-performance capacitive piezoresistive pressure sensors for electronic applications. Our technique can...
Significance Tissue morphogenesis requires coordinated regulation of cellular behavior through instructive signals from the local tissue environment, including mechanical forces exerted by neighboring cells. The cell–cell adhesion protein E-cadherin plays an important role in converting tensile across into intracellular response to regulate actin cytoskeleton organization, reinforce adhesion, and activate transcriptional programs. We show also transduces these orient mitotic spindle, which...
Hybridization of low-dimensional components with diverse geometrical dimensions should offer an opportunity for the discovery synergistic nanocomposite structures. In this regard, how to establish a reliable interfacial interaction is key requirement successful integration geometrically different components. Here, we present 1D/2D heterodimensional hybrids via dopant induced hybridization 2D Ti3C2Tx MXene 1D nitrogen-doped graphene nanoribbon. Edge abundant nanoribbon structures allow high...
Robotic skin with human-skin-like sensing ability holds immense potential in various fields such as robotics, prosthetics, healthcare, and industries. To catch up human skin, numerous studies are underway on pressure sensors integrated robotic to improve the sensitivity detection range. However, due trade-off between them, existing have achieved only a single aspect, either high or wide bandwidth. Here, an adaptive is proposed that has both broad bandwidth augmented beyond skin. A key for...
Mechanical linkage between cell-cell and cell-extracellular matrix (ECM) adhesions regulates cell shape changes during embryonic development tissue homoeostasis. We examined how the force balance cell-ECM with spread area aspect ratio in pairs of MDCK cells. used ECM micropatterning to drive different cytoskeleton strain energy states cell-generated traction forces a Förster resonance transfer tension biosensor ask whether across junctions correlated E-cadherin molecular tension. found that...
Inspired by the human somatosensory system, pressure applied to multiple sensors is received in parallel and combined into a representative signal pattern, which subsequently processed using machine learning. The signals are wireless where each sensor assigned specific resonant frequency on reflection coefficient (S11 ) spectrum, changes magnitude of S11 pole with minimal shift. This allows differentiation identification sensor. consists polypyrrole-coated microstructured...
We have developed an integrated strain array for cell culture enabling high-throughput mechano-transduction studies. Biocompatible chambers were with acrylic pneumatic compartment and microprocessor-based control system. Each element of the consists a deformable membrane supported by cylindrical pillar within well. For user-prescribed waveforms, annular region is pulled into well around under vacuum, causing pillar-supported cultured cells to be stretched biaxially. The optically clear...
A soft bending sensor based on the inverse pyramid structure is demonstrated, revealing that it can effectively suppress microcrack formation in designated regions, thus allowing cracks to open gradually with a controlled manner. Such feature enabled simultaneously have wide dynamic range of strain (0.025-5.4%), high gauge factor (∼74), and linearity (R2 ∼ 0.99). Furthermore, capture repeated instantaneous changes various types vibrations, owing its fast response time. Moreover, direction be...
Mechanical force and Wnt signaling activate β-catenin-mediated transcription to promote proliferation tissue expansion. However, it is unknown whether mechanical act independently or synergize β-catenin cell division. We show that strain induced Src-dependent phosphorylation of Y654 increased in mammalian MDCK epithelial cells. Under these conditions, cells accumulated S/G2 (independent DNA damage) but did not divide. Activating through Casein Kinase I inhibition Wnt3A addition...
The recent global spread of COVID-19 stresses the importance developing diagnostic testing that is rapid and does not require specialized laboratories. In this regard, nanomaterial thin-film-based immunosensors fabricated via solution processing are promising, potentially due to their mass manufacturability, on-site detection, high sensitivity enable direct detection virus without need for molecular amplification. However, thus far, biosensors have been properly analyzing how thin-film...
The behavior of cells is governed by signals originating from their local environment, including mechanical forces that experience. Forces are transduced mechanosensitive proteins, which can impinge on signaling cascades also activated growth factor receptors upon ligand binding. We investigated the crosstalk between these and biochemical in regulation intracellular networks epithelial monolayers. Phosphoproteomic transcriptomic analyses monolayers subjected to strain revealed ERK as a...
The study of biomechanics isolated cardiomyocytes can allow us to understand the cardiac function and disease development in absence viscoelastic or contractile properties surrounding tissue. However, popular techniques such as micropipettes carbon fibre-based measurements require serial, single-cell limit amount data passing through a system process. authors utilise elastomer micropost arrays microfabricated by replica molding technique for precise quantitative force with potential high...
We present the design, microfabrication, and characterization of ten sensors on one silicon die. demonstrate simultaneous monitoring multiple environmental parameters, including temperature, humidity, light intensity, pressure, wind speed, direction, magnetic field, acceleration in three axes. Through an integrated design fabrication process, these functions require only six photolithography mask steps. Temperature is measured redundantly using aluminum doped resistance thermal detectors a...