A5042180922- ZnO doping and properties
- Neuroscience and Neural Engineering
- GaN-based semiconductor devices and materials
- Nanowire Synthesis and Applications
- Job Satisfaction and Organizational Behavior
- Graphene research and applications
- Social Capital and Networks
- EEG and Brain-Computer Interfaces
- Neural dynamics and brain function
- Advanced Sensor and Energy Harvesting Materials
- Advanced Memory and Neural Computing
- Opinion Dynamics and Social Influence
- Complex Network Analysis Techniques
- Thin-Film Transistor Technologies
- Knowledge Management and Sharing
- Quantum Dots Synthesis And Properties
- Emotional Labor in Professions
- Semiconductor Quantum Structures and Devices
- Gas Sensing Nanomaterials and Sensors
- Boron and Carbon Nanomaterials Research
- Ga2O3 and related materials
- 2D Materials and Applications
- Innovation and Knowledge Management
- Speech and Audio Processing
- Conducting polymers and applications
University of California, San Diego
2019-2024
Soongsil University
2021-2024
Seoul National University
2014-2024
Yonsei University
2007-2023
BioSurfaces (United States)
2022
Saint Ambrose University
2017
Konkuk University Medical Center
2015
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials
2014
Shanghai Institute of Technical Physics
2014
Donghua University
2014
This study introduces the concept of group social capital, which is configuration members' relationships within a and in structure broader organization, an...
We introduce the concept of group social capital—the set resources made available to a through members' relationships within structure and in broader formal informal organization. argue that greater capital lead effectiveness there are many different conduits which flow. present multilevel, multidimensional model arguing an optimal balance all these maximizes effectiveness.
We introduce the construct of network inertia, referring to a persistent organizational resistance changing interorganizational ties or difficulties that an organization faces when it attempts dissolve old relationships and form new ties. Previous research has neglected process change in favor emphasis on identifying beneficial content effects networks. emphasize constraints propose multilevel conceptual model relating key sources inertia changes also discuss implications for evolution
Electrophysiological devices are critical for mapping eloquent and diseased brain regions therapeutic neuromodulation in clinical settings extensively used research brain-machine interfaces. However, the existing experimental often limited either spatial resolution or cortical coverage. Here, we developed scalable manufacturing processes with a dense electrical connection scheme to achieve reconfigurable thin-film, multithousand-channel neurophysiological recording grids using platinum...
Despite growing interest in social network brokerage, its psychological antecedents have been neglected. One possibility is that brokerage relates to self-monitoring personality orientation. High self-monitors, relative low adapting their self-presentations the demands of different groups, may occupy positions as brokers between disconnected worlds. For 162 Korean expatriate entrepreneurs a Canadian urban area, results showed those high tended direct roles within community--in terms...
A single thin-film transistor senses, amplifies, and multiplexes force to sense slip close the loop in robotic gripping.
We report the growth of GaN micro-rods and coaxial quantum-well heterostructures on graphene films, together with structural optical characterization, for applications in flexible devices. Graphene films were grown Cu foil by means chemical vapor deposition, used as substrates micro-rods, which subsequently transferred onto SiO2/Si substrates. Highly Si-doped, n-type using metal–organic deposition. The vertical alignment is a critical factor fabrication high-performance light-emitting diodes...
The epitaxial lateral overgrowth (ELOG) of GaN microdisks on graphene microdots and the fabrication flexible light-emitting diodes (LEDs) using these is reported. An ELOG technique with only patterned used, without any growth mask. discrete micro-LED arrays are transferred onto Cu foil by a simple lift-off technique, which works reliably under various bending conditions.
The enhanced electrochemical activity of nanostructured materials is readily exploited in energy devices, but their utility scalable and human-compatible implantable neural interfaces can significantly advance the performance clinical research electrodes. We utilize low-temperature selective dealloying to develop biocompatible one-dimensional platinum nanorod (PtNR) arrays that exhibit superb properties at various length scales, stability, biocompatibility for high neurotechnologies. PtNR...
Abstract The Utah array powers cutting‐edge projects for restoration of neurological function, such as BrainGate, but the underlying electrode technology has itself advanced little in last three decades. Here, dual‐side lithographic microfabrication processes is exploited to demonstrate a 1024‐channel penetrating silicon microneedle (SiMNA) that scalable its recording capabilities and cortical coverage suitable clinical translation. SiMNA first with flexible backing affords compliancy brain...
Despite ongoing advances in our understanding of local single-cellular and network-level activity neuronal populations the human brain, extraordinarily little is known about their "intermediate" microscale circuit dynamics. Here, we utilized ultra-high-density microelectrode arrays a rare opportunity to perform intracranial recordings across multiple cortical areas participants discover three distinct classes that are not locked natural brain rhythmic activity. The first included fast...
Abstract A facile and novel technique for the fabrication of pressure sensors is reported based on hybridization one-dimensional nanomaterials two-dimensional graphene film. In particular, piezoelectric are fabricated by using vertically aligned position- dimension-controlled ZnO nanotube arrays grown layers. Graphene layers act not only as substrates catalyst-free growth high-quality nanotubes but also flexible conduction channels connecting metal electrodes. Freestanding have been...
Abstract The authors report the fabrication of highly sensitive, rapidly responding flexible force sensors using ZnO/ZnMgO coaxial nanotubes grown on graphene layers and their applications in sleep apnea monitoring. Flexible are fabricated by forming Schottky contacts to nanotube array, followed mechanical release entire structure from host substrate. electrical characteristics ZnO nanotube‐based thoroughly investigated compared. Importantly, sensor applications, results significantly higher...
This paper explores why and how organizations respond to external pressures for institutional change in terms of organizational political dynamics. The focus on dynamics is important understanding a period when multiple groups actors are involved the dynamic processes promoting each group's goals, interests, ideologies, logic. We propose social movement framework that focuses interactions between two sets actors—incumbents challengers—in an organization explain micro-foundation underlying...
Heteroepitaxy of semiconductors on two-dimensional (2-d) atomic layered materials enables the use flexible and transferable inorganic electronic optoelectronic devices in various applications. Herein, we report shape- morphology-controlled van der Waals (vdW) epitaxy ZnO nanostructures hexagonal boron nitride (hBN) insulating layers for an architectured semiconductor integration 2-d materials. The vdW surface feature nanomaterials, because free dangling bonds, typically results low-density...
Lasing from long semiconductor nanorods is dictated by Fabry-Perot (FP) resonances whereas that large-diameter microrods determined whispering gallery modes (WGMs). Lengths and diameters intermediate between the two systems represent an important size regime for photonics electronics, but have not been studied in detail. Here, we report on detection of FP WGM lasing emissions a single GaN microrod, demonstrate ability to switch mechanisms translating excitation beam along microrod. The...
Single-crystal gallium nitride (GaN) layers were directly grown on centimeter-scale hexagonal boron (h-BN). Using chemical vapor deposition (CVD), h-BN films synthesized a single-crystal Ni(111) and readily transferred onto amorphous fused silica supporting substrates that had no epitaxial relationship with GaN. For growing fully coalescent GaN h-BN, the achievement of high-density crystal growths was critical growth step because sp2-bonded are known to be free dangling bonds. Unlike typical...
Abstract We report the fabrication and characterization of transparent thin-film transistors (TFTs) having a double-gate structure with an indium gallium zinc oxide (IGZO) channel tin (ITO) electrodes. The TFTs were fabricated on quartz substrates, radio-frequency magnetron sputtering IGZO channels ITO Al2O3 gate insulators deposited by atomic layer deposition. devices exhibited excellent transparency, > 80% visible light transmittance. By precisely adjusting O₂ flow during deposition, we...
We report the growth and transfer of centimeter-sized, epitaxial hexagonal boron nitride (h-BN) few-layer films using Ni(111) single-crystal substrates. The h-BN were heteroepitaxially grown on 10 × mm2 or 20 substrates atmospheric pressure chemical vapor deposition with a single ammonia-borane precursor. transferred to arbitrary via an electrochemical delamination technique, remaining repeatedly re-used. A careful analysis parameters revealed that crystallinity area coverage mostly...
The bottom-up integration of a 1D-2D hybrid semiconductor nanostructure into vertical field-effect transistor (VFET) for use in flexible inorganic electronics is reported. Zinc oxide (ZnO) nanotubes on graphene film used as an example. VFET fabricated by growing position- and dimension-controlled single crystal ZnO vertically large film. film, which acts the substrate, provides bottom electrical contact to nanotubes. Due high quality unique 1D device structure, exhibits excellent...
Purpose – The purpose of this paper is to examine how the emotional labor strategies service employees differently influence level their creativity, and whether creative consequently benefit from that creativity in terms achieving a high job performance. Design/methodology/approach authors surveyed flight attendants an airline South Korea. distributed 150 questionnaires attendants, received 126 responses, finally obtained 119 usable data. used Mplus 7.13 evaluate validity test hypotheses....