Kyeong-Seok Lee
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View article: Design of CMOS-memristor hybrid synapse and its application for noise-tolerant memristive spiking neural network
Design of CMOS-memristor hybrid synapse and its application for noise-tolerant memristive spiking neural network Open
In view of the growing volume of data, there is a notable research focus on hardware that offers high computational performance with low power consumption. Notably, neuromorphic computing, particularly when utilizing CMOS-based hardware, h…
View article: Hybrid CMOS-Memristor synapse circuits for implementing Ca ion-based plasticity model
Hybrid CMOS-Memristor synapse circuits for implementing Ca ion-based plasticity model Open
Neuromorphic computing research is being actively pursued to address the challenges posed by the need for energy-efficient processing of big data. One of the promising approaches to tackle the challenges is the hardware implementation of s…
View article: Pathogenesis and epidemiology of chronic subdural hematoma
Pathogenesis and epidemiology of chronic subdural hematoma Open
Background: Chronic subdural hematoma (SDH) is a common condition encountered in neurosurgical practice; however, its pathogenesis remains controversial.Current Concepts: SDH refers to blood accumulation inside the dura and is classified i…
View article: Multifilamentary switching of Cu/SiOx memristive devices with a Ge-implanted a-Si underlayer for analog synaptic devices
Multifilamentary switching of Cu/SiOx memristive devices with a Ge-implanted a-Si underlayer for analog synaptic devices Open
Various memristive devices have been proposed for use in neuromorphic computing systems as artificial synapses. Analog synaptic devices with linear conductance updates during training are efficiently essential to train neural networks. Alt…
View article: Gradient Scaling on Deep Spiking Neural Networks with Spike-Dependent Local Information
Gradient Scaling on Deep Spiking Neural Networks with Spike-Dependent Local Information Open
Deep spiking neural networks (SNNs) are promising neural networks for their model capacity from deep neural network architecture and energy efficiency from SNNs' operations. To train deep SNNs, recently, spatio-temporal backpropagation (ST…
View article: Laser‐Assisted Nanotexturing for Flexible Ultrathin Crystalline Si Solar Cells
Laser‐Assisted Nanotexturing for Flexible Ultrathin Crystalline Si Solar Cells Open
Ultrathin (UT) crystalline Si wafers, which are more flexible than conventional ones, can apply to curved surfaces, enabling a wide range of applications such as building‐integrated photovoltaics, vehicle‐integrated photovoltaics, and wear…
View article: Reduction of carrier density and enhancement of the bulk Rashba spin-orbit coupling strength in Bi2Te3/GeTe superlattices
Reduction of carrier density and enhancement of the bulk Rashba spin-orbit coupling strength in Bi2Te3/GeTe superlattices Open
Featured with the large Rashba constant (αR ∼ 4.2 eVÅ) coupled with the ferroelectricity, GeTe has attracted much interest, proposing novel energy-efficient spintronic devices. However, those approaches are hampered by the high hole densit…
View article: Multi-filamentary switching of Cu/SiOx memristive devices with a Ge-implanted a-Si under-layer for analog synaptic devices
Multi-filamentary switching of Cu/SiOx memristive devices with a Ge-implanted a-Si under-layer for analog synaptic devices Open
Various memristive devices have been proposed for use in neuromorphic computing systems as artificial synapses. The analog synaptic devices with linear conductance updates during training are essential to train neural networks efficiently.…
View article: Laser-assisted Nano-texturing for Flexible Ultrathin Crystalline Si Solar Cells
Laser-assisted Nano-texturing for Flexible Ultrathin Crystalline Si Solar Cells Open
Ultrathin crystalline Si wafers, which are more flexible than conventional ones, can apply to curved surfaces, enabling a wide range of applications such as building integrated photovoltaics, vehicle integrated photovoltaics and wearable d…
View article: Emulating the short-term plasticity of a biological synapse with a ruthenium complex-based organic mixed ionic–electronic conductor
Emulating the short-term plasticity of a biological synapse with a ruthenium complex-based organic mixed ionic–electronic conductor Open
This study provides an organic mixed ionic–electronic conductor (OMIEC) memristor based on Ru(bpy) 3 (PF 6 ) 2 as an organic active layer to mimic the STP of a biological synapse.
View article: Predicting ligand-dependent nanocrystal shapes of InP quantum dots and their electronic structures
Predicting ligand-dependent nanocrystal shapes of InP quantum dots and their electronic structures Open
InP quantum dots serve as solid candidates for the next-generation displays, yet their limited external quantum efficiencies have been the primary concern towards establishing self-luminous QD displays. At the heart of the problem lies our…
View article: Ion beam-assisted solid phase epitaxy of SiGe and its application for analog memristors
Ion beam-assisted solid phase epitaxy of SiGe and its application for analog memristors Open
Low dimensional defects such as dislocation in single crystal Si are known to serve as a fast diffusion path of metal ions. Recently, many efforts have been made to employ dislocations in single crystal based oxide and silicon as reliable …
View article: Novel nano-plasmonic sensing platform based on vertical conductive bridge
Novel nano-plasmonic sensing platform based on vertical conductive bridge Open
A novel nano-plasmonic sensing platform based on vertical conductive bridge was suggested as an alternative geometry for taking full advantages of unique properties of conductive junction while substantially alleviating burdens in lithogra…
View article: Frequency-tunable nano-oscillator based on Ovonic Threshold Switch (OTS)
Frequency-tunable nano-oscillator based on Ovonic Threshold Switch (OTS) Open
Nano-oscillator devices are gaining more and more attention as a prerequisite for developing novel energy-efficient computing systems based on coupled oscillators. Here, we introduce a highly scalable, frequency-tunable nano-oscillator con…
View article: Optimization of tunable guided-mode resonance filter based on refractive index modulation of graphene
Optimization of tunable guided-mode resonance filter based on refractive index modulation of graphene Open
To fabricate a tunable optical filter with a fast response in the near infrared region, a tunable guided-mode resonance (GMR) filter using graphene was proposed and its performance was optimized. In this study, a rigorous coupled wave anal…
View article: Novel Porous Brain Electrodes for Augmented Local Field Potential Signal Detection
Novel Porous Brain Electrodes for Augmented Local Field Potential Signal Detection Open
Intracerebral local field potential (LFP) measurements are commonly used to monitor brain activity, providing insight into the flow of information across neural networks. Herein we describe synthesis and application of a neural electrode p…
View article: How to Treat Chronic Subdural Hematoma? Past and Now
How to Treat Chronic Subdural Hematoma? Past and Now Open
Treatment of chronic subdural hematoma (CSDH) is relatively straightforward, however, there is still some debate regarding the best strategy for treatment. The most practical recommendations of up to date were identified by a review of lit…
View article: Cerebral Aneurysms in Judicial Precedents
Cerebral Aneurysms in Judicial Precedents Open
Judicial precedents on the cerebral aneurysm included not only malpractice suits, but also causation analysis or insurance payment. Attention to these subjects is needed. We also need education of the independent medical examination. To av…
View article: Causes and Trauma Apportionment Score of Chronic Subdural Hematoma
Causes and Trauma Apportionment Score of Chronic Subdural Hematoma Open
The TAS is a useful tool for differentiating the causality of CSH.
View article: Electrical and Optical Investigation of the Growth Behavior of Au Nanoparticles Fabricated on Various Matrix Materials by the Alternating Sputtering Method
Electrical and Optical Investigation of the Growth Behavior of Au Nanoparticles Fabricated on Various Matrix Materials by the Alternating Sputtering Method Open
Nanocomposite films, which are comprised of metal nanoparticles dispersed in a matrix layer, have attracted great interest due to their unique electrical and optical properties, which are mainly due to the excitation of localized surface p…
View article: Fabrication of parabolic Si nanostructures by nanosphere lithography and its application for solar cells
Fabrication of parabolic Si nanostructures by nanosphere lithography and its application for solar cells Open
We demonstrated fabrication of a parabola shaped Si nanostructures of various periods by combined approach of nanosphere lithography and a single step CF 4 /O 2 reactive ion etch (RIE) process. Silica nanosphere monolayers in a hexagonal a…
View article: Efficacy of Balloon-Guiding Catheter for Mechanical Thrombectomy in Patients with Anterior Circulation Ischemic Stroke
Efficacy of Balloon-Guiding Catheter for Mechanical Thrombectomy in Patients with Anterior Circulation Ischemic Stroke Open
A BGC significantly reduces the number of retrievals and the occurrence of distal emboli, thereby resulting in better clinical outcomes in patients with anterior circulation ischemic stroke, particularly with ICA occlusion.
View article: Clinical Features of Interhemispheric Subdural Hematomas
Clinical Features of Interhemispheric Subdural Hematomas Open
IHSDH is rare especially the isolated one. The outcome was dependent to the severity of injury. Surgery may be helpful to remove the concurrent mass lesion, however, conservative treatment is generally preferred.
View article: The Changing Trends in Age of First-Ever or Recurrent Stroke in A Rapidly Developing Urban Area during 19 Years
The Changing Trends in Age of First-Ever or Recurrent Stroke in A Rapidly Developing Urban Area during 19 Years Open
Background: To evaluate the trends in age of stroke and compare with recent national wide data in a rapidly developing urban area over the 19 years from 1997 to 2015. Methods: We recruited 12,370 patients who were diagnosed from 1997 to 20…