A5101756356- Bone Tissue Engineering Materials
- Indoor and Outdoor Localization Technologies
- Innovation Diffusion and Forecasting
- Firm Innovation and Growth
- Orthopaedic implants and arthroplasty
- Technology and Data Analysis
- Marine and Coastal Research
- Photoreceptor and optogenetics research
- Technology Assessment and Management
- Millimeter-Wave Propagation and Modeling
- CCD and CMOS Imaging Sensors
- Maritime Ports and Logistics
- Metal and Thin Film Mechanics
- Urban and Freight Transport Logistics
- Mobile Crowdsensing and Crowdsourcing
- Corrosion Behavior and Inhibition
- ICT Impact and Policies
- Wound Healing and Treatments
- Advanced Memory and Neural Computing
- Titanium Alloys Microstructure and Properties
- Neuroscience and Neural Engineering
- Electron and X-Ray Spectroscopy Techniques
- Advanced Sensor and Energy Harvesting Materials
- Ion-surface interactions and analysis
- Semiconductor materials and devices
Korea Electronics Technology Institute
2023-2025
Northwestern University
2021-2024
Shirley Ryan AbilityLab
2024
Lux Research (United States)
2024
Korea Research Institute of Standards and Science
2007-2023
Kyungpook National University
2019-2023
Pohang University of Science and Technology
2001-2023
Seoul National University
2007-2022
Simpson University
2021
Korea Institute of Industrial Technology
2020
Chronic wounds, particularly those associated with diabetes mellitus, represent a growing threat to public health, additional notable economic impacts. Inflammation these wounds leads abnormalities in endogenous electrical signals that impede the migration of keratinocytes needed support healing process. This observation motivates treatment chronic stimulation therapy, but practical engineering challenges, difficulties removing hardware from wound site, and absence means monitor process...
In vascular surgical applications, small-diameter grafts made from synthetic polymers are rarely commercialized, owing to delayed reendothelialization and subsequent thrombus formation occlusion. Here, we describe a novel design for poly-ε-caprolactone (PCL) graft with functional, bilayered nanofibrous structure composition that enables suitable healing process gradual degradation/replacement by natural blood vessels. To improve cell responses the PCL, bioactive polymer (collagen)...
Local electrical stimulation of peripheral nerves can block the propagation action potentials, as an attractive alternative to pharmacological agents for treatment acute pain. Traditional hardware such purposes, however, involves interfaces that damage nerve tissue and, when used temporary pain relief, impose costs and risks due requirements surgical extraction after a period need. Here, we introduce bioresorbable stimulator enables associated mitigation without these drawbacks. This...
Diabetic foot ulcers are chronic wounds that affect millions and increase the risk of amputation mortality, highlighting critical need for their early detection. Recent demonstrations wearable sensors enable real-time wound assessment, but they rely on bulky electronics, making them difficult to interface with wounds. Herein, a miniaturized, wireless, battery-free monitor measures lactate in seamlessly integrates bandages conformal attachment bed is introduced. Lactate selected due its...
The fingerprint-based approach for positioning in WLAN has been drawing great attention these days. However, the usually requires tremendous time and efforts to collect location fingerprints target area. In this paper, we propose an interpolation method based on Voronoi tessellation significantly reduce such calibration improve accuracy. Unlike other methods, our refines propagation model each cell of area tessellated by a higher-order diagram. Consequently, can take into account signal...
Poly(ether imide) (PEI) has shown satisfactory corrosion protection capability with good adhesion strength as a coating for magnesium (Mg), potential candidate of biodegradable orthopedic implant material. However, its innate hydrophobic property causes insufficient osteoblast affinity and lack osseointegration. Herein, we modify the physical chemical properties PEI-coated Mg implant. A plasma immersion ion implantation technique is combined direct current (DC) magnetron sputtering to...
Blood lactate concentration is an established circulating biomarker for measuring muscle acidity and can be evaluated monitoring endurance, training routines, or athletic performance. Sweat alternative biofluid that may serve similar purposes offers the advantage of noninvasive collection continuous monitoring. The relationship between blood dynamic sweat biochemistry wearable engineering applications in physiological fitness remains poorly defined. Here, we developed a microfluidic band...
In recent years, pure iron (Fe) has attracted significant attention as a promising biodegradable orthopedic implant material due to its excellent mechanical and biological properties. However, in physiological conditions, Fe an extremely slow degradation rate with localized irregular degradation, which is problematic for practical applications. this study, we developed novel combination of nanostructured surface topography galvanic reaction achieve uniform accelerated implant. The target-ion...
Considerable evidence suggests the gut‐brain axis can influence behaviour. However, there has been a conspicuous lack of technology to provide targeted wireless activation in conscious freely moving animals. We utilised miniature fully implantable battery‐free device apply highly controlled optogenetic stimuli terminal region GI‐tract, mice. The optical stimulator was implanted and secured on serosal surface distal colon rectum characterize behavioural responses evoked by stimulation axons...
This study investigates the diffusion of mobile telecommunications in Korea. The aim is to compare performance logistic model with that a time series autoregressive moving average and identify factors determine adoption process. Empirical results are based on annual data cellular subscribers covering 1984 2002. Results suggest that, speed increases per capita GDP, but it decreases number main telephone lines operation.
The ongoing global health has highlighted the critical issue of secondary infections, particularly antibiotic-resistant bacterial which have been significant contributors to mortality rates. Orthopedic implants, while essential for trauma and orthopedic surgeries, are susceptible these leading severe complications economic burdens. traditional use antibiotics in treating infections poses further challenges including risk developing bacteria. This study introduces a novel approach combat this...
Abstract Recent advances in passive flying systems inspired by wind-dispersed seeds contribute to increasing interest their use for remote sensing applications across large spatial domains the Lagrangian frame of reference. These concepts create possibilities developing and studying structures with performance characteristics operating mechanisms that lie beyond those found nature. Here, we demonstrate a hybrid flier system, fabricated through process controlled buckling, yield unusual...
Effects of organic additives such as benzoic acid (BA) and poly(ethylene glycols) (PEGs) on the initial stages zinc electroplating were investigated at an iron electrode using cyclic voltammetry, energy-dispersive spectroscopy, soft X-ray absorption electrochemical impedance spectroscopy in acidic chloride solution. BA mainly contributed to roughness control layer with a relatively weak interaction ions. However, PEG molecules raise overpotential for reduction both ions protons by...
Abstract 3D printing technology has been gradually applied to various areas. In the present study, 3D-printed implants were fabricated with direct metal laser sintering technique for a dental single root titanium. The allocated into following groups: not treated (3D-None), sandblasted large grit and acid-etched (3D-SLA), target-ion-induced plasma-sputtered surface (3D-TIPS). Two holes drilled in each tibia of rabbit, three groups randomly placed mallet. Rabbits sacrificed at two, four,...
• Functionally assembled metal platforms as Lego-like building blocks were prepared by pin and hole systems. Biomimetic titanium scaffold (BTS) was developed a mechanical support multi-biomolecule carrier. The scaffolds can simultaneously deliver growth factor antibiotic agents in controlled manner. This novel fabrication method be used with various metals, bioactive molecules, architecture, medical applications. Natural bone substituting materials derived from living organisms have been...
The proliferation of Wi-Fi infrastructures has facilitated numerous indoor localization techniques using location fingerprints. They make it possible to identify a room or place in urban environment, which is especially important enabling many interesting location-based services. As there are too rooms and places such as cafes restaurants be recognized the crowdsourcing approach been proposed collect fingerprints based on user participation. However, its actual deployment large-scale...
Nano-scale surface roughening of metallic bio-implants plays an important role in the clinical success hard tissue reconstruction and replacement. In this study, nano-topographical features titanium-niobium-zirconium (TNZ) alloy surfaces were controlled by using target-ion induced plasma sputtering (TIPS) technique to improve vitro osteoblastic response. The TIPS is a novel strategy for etching bombardment target metal cations, which accelerated extremely high negative bias voltage applied...
Jaihyunk Ryu, Soon-Jae Kwon, Dong-Gun Kim, Min-Kyu Lee, Jung Min Yeong Deuk Jo, Sang Hoon Wook Jeong, Kyung-Yun Kang, Se Won Jin-Baek and Si-Yong Kang. J Plant Biotechnol 2017;44:416-30. https://doi.org/10.5010/JPB.2017.44.4.416