A5065125987- Non-Invasive Vital Sign Monitoring
- ECG Monitoring and Analysis
- Heart Rate Variability and Autonomic Control
- EEG and Brain-Computer Interfaces
- Semiconductor materials and devices
- Advanced Sensor and Energy Harvesting Materials
- Advancements in Semiconductor Devices and Circuit Design
- Muscle activation and electromyography studies
- Infrared Thermography in Medicine
- Context-Aware Activity Recognition Systems
- Oral microbiology and periodontitis research
- Ferroelectric and Negative Capacitance Devices
- Balance, Gait, and Falls Prevention
- Photoacoustic and Ultrasonic Imaging
- Dental Research and COVID-19
- Traditional Chinese Medicine Studies
- GaN-based semiconductor devices and materials
- Parkinson's Disease Mechanisms and Treatments
- Ultrasound and Hyperthermia Applications
- Wireless Body Area Networks
- Dental Radiography and Imaging
- Cerebral Palsy and Movement Disorders
- Diverse Approaches in Healthcare and Education Studies
- Integrated Circuits and Semiconductor Failure Analysis
- Thermoregulation and physiological responses
Samsung (South Korea)
2003-2024
Konkuk University
2012-2022
Konkuk University Medical Center
2007-2018
Bio Pharm Dongsung (South Korea)
2017
Yonsei University
1997-2015
Institute of Biophysics and Biomedical Engineering
2014
Korea Meteorological Administration
2012
IBM (United States)
2012
Vatech (South Korea)
2009
Seoul National University
2006
In the last few years, textile electrodes have become an interesting topic for physiological monitoring, steadily developing to be applied in innovative wearable sensing systems. The structure of can fabricated by weaving, knitting, or embroidering conductive yarn and is now commercially available. upgraded electrode used biosignal was designed form a jacquard woven measure ECG. case knit fabric, which has piezo‐resistive properties, were developed using fabric's flexible strain gauges...
A small and wireless accelerometer system was developed for the estimation of temporal gait parameters. The new built using two 3-axis accelerometers. Measurement's accuracy assessed as a criterion standard provided by foot switches. To assess consistency this system, estimates heel contact toe off time based on accelerometers those footswitches were compared 20 steps from 8 individual healthy subjects. Accelerometers had high in stance, swing, single support, double support cycle revealed...
We present the most energy-efficient 16 Mb non-volatile RAM (nvRAM) product with nearly unlimited endurance by using 28-nm embedded MRAM (eMRAM) technology. Among commercially available standalone nvRAM products, this features smallest package dimension of 30 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> at and best-in-class active power 14 mW (read) 27 (write). By extensive testing, over 1E14 cycles - 25 °C 10-years data retention...
For the first time, 512 Mb DRAMs using a Recess-Channel-Array-Transistor(RCAT) are successfully developed with 88 nm feature size, which is smallest size ever reported in DRAM technology non-planar array transistor. The RCAT gate length of 75 and recessed channel depth 150 exhibits drastically improved electrical characteristics such as DIBL, BV/sub DS/, junction leakage cell contact resistance, comparing to conventional planar transistor same length. most powerful effect great improvement...
A simple algorithm using topological mapping has been developed for a real-time detection of the QRS complexes ECG signals. As measure complex energy, authors used from one dimensional sampled signals to two vectors. To describe change curvature, derive modified spatial velocity (MSV), MSV can locate more easily. The proposed consists very small C-language procedures which reliably recognize complexes. For evaluation MIT/BIH arrhythmia database. provides good performance, 99.58% rate...
A method for manufacturing terahertz absorber is presented. Varying fractions of graphite powder are mixed with the host poly methylmethacrylate and compress molded. The shielding efficiency, together real imaginary parts dielectric constant, unambiguously determined by time domain spectroscopy in continuous frequency range 0.1–1.6THz. While composites absorptive most relatively small reflection, it turns metallic at a high enough fraction 35.7%: there exists zero crossing part function...
Purpose. The purpose of this study is to develop an automatic human movement classification system for the elderly using single waist-mounted tri-axial accelerometer.Methods. Real-time algorithm was developed a hierarchical binary tree, which can classify activities daily living into four general states: (1) resting state such as sitting, lying, and standing; (2) locomotion walking running; (3) emergency fall (4) transition sit stand, stand sit, lie, lie sit. To evaluate proposed algorithm,...
Aim: Bradykinesia of the lower limb is an important limiting factor quality life in parkinsonian patients. This study aims to develop quantitative measures bradykinesia and investigate possible dissociation amplitude velocity their dependence on movement direction during toe‐tapping. Methods: Subjects included 39 patients with PD, as well 14 healthy control subjects. A gyrosensor dorsum a foot was used measure ankle joint Four representations (root‐mean square, mean peak, coefficient...
Due to the possible occurrence of periodontal disease at an early age, it is important have proper toothbrushing habits as possible. With this aim, feasibility and concept a smart toothbrush (ST) capable tracing motion orientation information was suggested. In study, we proposed advanced ST system brushing region classification algorithm. order trace in mouth, required absolute coordinate ST. By using tilt-compensated azimuth (heading) algorithm, found inclination toothbrush, while inner...
This study investigates the possibility of using normalized time-domain features Electrocardiogram (ECG) for improving capability human identification. For this purpose, we measured lead-1 rest ECG (normal heart rate) and physically active one (fast from pre-selected group. The characteristic points on waveform, P, QRS, T are extracted in terms its time location data is reconstructed beat-by-beat basis by Fourier synthesis. R-T interval, Q-T QRS interval sequence physical mode computed....
Purpose: Freezing of gait (FOG), increasing the fall risk and limiting quality life, is common at advanced stage Parkinson's disease, typically in old ages. A simple unobtrusive FOG detection system with a small calculation load would make fast presentation on-demand cueing possible. The purpose this study was to find practical system. Patients methods: sole-mounted sensor developed for an measurement acceleration during gait. Twenty patients disease participated study. time-domain method...
InGaN/GaN multi-quantum well (MQW) laser diodes (LDs) were grown on c-plane sapphire substrates using a multi-wafer MOCVD system. The threshold current for pulsed lasing was 1.6 A gain-guided diode with stripe of 10 × 800 μm 2 . density 20.3 kA cm −2 and the voltage 16.5 V. optical power ratio transverse electric mode to magnetic found be greater than 50. characteristic temperature measured from plot versus measurement between 130 150K.
In this paper, we present a high performance planar 20nm CMOS bulk technology for low power mobile (LPM) computing applications featuring an advanced high-k metal gate (HKMG) process, strain engineering, 64nm pitch & ULK dielectrics. Compared with 28nm technology, it offers 0.55X density scaling and enables significant frequency improvement at lower standby power. Device drive current up to 2X equivalent leakage is achieved through co-optimization of HKMG process engineering. A fully...
In order to detect blood volume changes, we proposed the new magnetic plethysmographic sensor using time-varying fields, and thereby, measuring change of impedance exciting coil. The coil was proportional passing through a volume-of-interests, which inductively coupled with verify feasibility method, photo-plethysmographic magneto-plethysmographic (MPG) signals were recorded from index middle finger left hand simultaneously. Comparison ultrasound Doppler flow velocity recordings shows...
Abstract Background School children are in a developmental period which permanent teeth replace primary dentition. It is also with high incidence of gingivitis and caries, can be improved adequate tooth brushing. Advances information technology have led to the development smart health devices that assist We compared effectiveness computer-assisted toothbrushing using instruction (TBI) method called toothbrush mirror (STM) system conventional TBI (verbal instructions) for plaque control...
A novel algorithm estimating the calorie expenditure during physical activities is introduced. The activity quantified by integration of accelerometer signals obtained from 3D fixed at waist level human body. Simultaneous measurements and using gas analyzer show increases as with different rates depending on type (e.g., walking, running) well characteristics subjects gender, age, mass, height). Based experimental data gathered 94 subjects, we suggest a new dependent demographic types activity.
The design of an intelligent toothbrush, capable monitoring brushing motion, orientation through the grip axis, during toothbrushing is described. Inappropriate tooth-brushing styles, even in adults, sometimes cause dental problems, cavities, gingivitis, etc. This smart system provides user to monitor his or her pattern using accelerometer and magnetic sensors for evaluation style. Directional information toothbrush with respect earth's field activity data were measured by a miniaturized...
We report on the enhanced quantum efficiency of GaN-based light-emitting diodes (LEDs) fabricated inverted hexagonal pyramid dielectric mask (IHPDM)-embedded structure. The ray-tracing calculation showed that extraction LEDs IHPDM-embedded structure could be up to 56%. Compared reference, n-GaN template grown also a reduction in dislocation density by 57%, leading an increase photoluminescence intensity 82%. LED exhibited forward leakage current one order magnitude (&lt;1.5 V) and...