A5101743067- Advancements in Battery Materials
- Analytical Chemistry and Sensors
- Carbon Nanotubes in Composites
- Tribology and Wear Analysis
- Metal and Thin Film Mechanics
- Lubricants and Their Additives
- Internet of Things and Social Network Interactions
- Supercapacitor Materials and Fabrication
- Innovation and Knowledge Management
- Piezoelectric Actuators and Control
- Organic Light-Emitting Diodes Research
- Force Microscopy Techniques and Applications
- Advanced Battery Materials and Technologies
- Multimedia Communication and Technology
- Quantum Dots Synthesis And Properties
- Semiconductor materials and devices
- Nanowire Synthesis and Applications
- Advanced Measurement and Metrology Techniques
- Gas Sensing Nanomaterials and Sensors
- Advanced Photocatalysis Techniques
- TiO2 Photocatalysis and Solar Cells
- Graphene research and applications
- Psychosocial Factors Impacting Youth
- Advanced machining processes and optimization
- Engineering Applied Research
Chosun University
2023-2025
Korea Research Institute of Standards and Science
2007-2024
Korea Advanced Institute of Science and Technology
2022
Seoul National University
2003-2021
Korea National Sport University
2020
Samsung (South Korea)
2020
Hankuk University of Foreign Studies
2013-2019
Ulsan National Institute of Science and Technology
2014-2016
Ulsan College
2014-2015
Hallym University
2015
Physical unclonable function (PUFs) utilize inherent random physical variations of solid-state devices and are a core ingredient hardware security primitives. PUFs promise more robust information than that provided by the conventional software-based approaches. While silicon- memristor-based advancing, their reliability scalability require further improvements. These currently limited output fluctuations associated additional peripherals. Here, highly reliable spintronic exploit field-free...
We demonstrate a simple synthetic process of Si/Al<sub>2</sub>O<sub>3</sub> foam particles by chemical etching and thermal oxidation.
The photoluminescence behavior of CdS quantum dots in initial growth stage was studied connection with an annealing process. Compared to the as-synthesized (quantum efficiency ≅ 1%), heat-treated sample showed enhanced luminescence properties 29%) a narrow band-edge emission. simple process diminished accumulated defect states within nanoparticles and thereby reduced nonradiative recombination, which confirmed by diffraction, absorption, time-resolved photoluminescence. Consequently, highly...
Abstract To prevent maritime accidents, it is crucial to be aware of the surrounding environment near ships. The images recorded by a camera mounted on ship could used for awareness other ships it. In this study, was performed using three procedures: detection, localization, and tracking. Initially, detection deep learning-based model, YOLO (You Only Look Once) v3, based image. A virtual image dataset constructed Unity overcome difficulty obtaining onboard with various sizes ships, improve...
Several paired, localized gap states were observed in semiconducting single-wall carbon nanotubes using spatially resolved scanning tunneling spectroscopy. A pair of is found far from the band edges, forming deep levels, while other located near shallow levels. With help a first-principles study, former explained by vacancy-adatom complex latter pentagon-heptagon structure. Our experimental observation indicates that presence provides means to perform local band-gap engineering as well...
We demonstrate a facile method for synthesizing silicon particles with double coating layer consisting of aluminum trifluoride and amorphous carbon to use as an anode material high-performance lithium-ion batteries at elevated temperatures.
In this study, we explored the effects of etching on surface properties and tribological performance silicone rubber for hydrogen compressor applications. Ceramic particle-coated specimens were etched using a solution nitric acid ammonium fluoride different durations. XRD Raman analyses confirmed that process did not alter crystalline structure molecular bonding PDMS matrix. EDS analysis revealed changes in composition after etching. The findings demonstrated extended times resulted...
A framework for recommending online videos operates by constructing user profiles as an aggregate of tag clouds and generating recommendations according to similar viewing patterns.
This study explored the potential enhancement of lubrication performance by incorporating polydimethylsiloxane (PDMS) powder as a lubricant additive.
We demonstrate a facile synthesis of micrometer-sized porous Si particles via copper-assisted chemical etching process. Subsequently, metal and/or silicide layers are introduced on the surface using simple reduction Macroporous and metal/metal silicide-coated electrodes exhibit high initial Coulombic efficiency ∼90%. Reversible capacity carbon-coated gradually decays after 80 cycles, while show significantly improved cycling performance even 100 cycles with reversible >1500 mAh g(-1)....
Nano-stages are used in many ultra-precision systems, such as scanning probe microscope (SPM), optical fiber aligners, cutting, measuring and systems. Generally, machining achieved using a nano-scale motion stage actuated Piezo-electric actuators (PZT), the importance of demands for increase with need to improve system performance accuracy. However, it is difficult find solutions because characteristics stages determined by various factors, hinge structure, actuator, method control. This...
As mechanical devices in the nano/micro length scale are increasingly employed, it is crucial to understand nanoscale friction and wear especially at technically relevant sliding velocities. Accordingly, a novel technique has been developed for coefficient mapping (FCM), leveraging recent advances high speed AFM. The efficiently acquires versus force curves based on sequence of images single location, each with incrementally lower loads. result, true maps can be uniquely calculated...
Glioblastoma multiforme (GBM) is the most aggressive malignant tumor. It difficult to regulate GBM using conventional chemotherapy-based methods due its anatomical structure specificity, low drug targeting ability, and limited penetration depth capability reach tumor interior. Numerous approaches have been proposed overcome such issues, including nanoparticle-based delivery system (DDS) with development of site enhancing moieties (e.g., peptides, sugars, proteins, etc.). In this study, we...
In this study, we propose a method to enhance the friction and wetting properties of aluminum surfaces with micro-/nanostructures by coating them PDMS/lubricant composite.
The local electronic structure of semiconducting single-wall carbon nanotubes was studied with scanning tunneling microscopy. We performed spectroscopy measurement at selected locations on the center axis nanotubes, acquiring a map density states. Spatial oscillation observed in states period atomic lattice. Defect induced interface were found junctions two which are well-understood analogy bulk semiconductor heterostructures. leak van Hove singularity peaks across junction, due to...
We demonstrate a hybrid biological photovoltaic device by forming 3D cooperative biofilm of cyanobacteria and heterotrophic bacteria. bioprinting technique was applied to engineer cyanobacterial encapsulation in hydrogels over the The continuously generated bioelectricity from bacterial respiration with organic biomass supplied photosynthesis. This innovative platform can be most suitable power source for unattended sensors, especially those deployed remote resource-limited field locations.
To gain a sustainable competitive advantage through cross-border mergers and acquisitions (M&As), acquiring firms need to correctly anticipate the consequences of national cultural differences. By comparing antecedents as well performances domestic M&As (DMA) (CMA) in Korean M&A market from 1999 2007, this study aims gauge whether CMAs can be viable option for growth strategy. This paper tests two conflicting hypotheses (H) regarding effects From perspective essentialist...
Nano-stages are used in many ultra-precision systems, such as scanning probe microscope (SPM), optical fiber aligners, cutting, measuring and systems. Generally, machining achieved using a nano-scale motion stage actuated Piezo-electric actuators (PZT), the importance of demands for increase with need to improve system performance accuracy. However, it is difficult find solutions because characteristics stages determined by various factors, hinge structure, actuator, method control. This...