A5100410817- Antenna Design and Analysis
- Energy Harvesting in Wireless Networks
- Advanced Antenna and Metasurface Technologies
- Antenna Design and Optimization
- Microwave Engineering and Waveguides
- Cardiovascular Function and Risk Factors
- Cardiac Imaging and Diagnostics
- Wireless Power Transfer Systems
- Advanced Sensor and Energy Harvesting Materials
- Acute Myocardial Infarction Research
- Nanomaterials and Printing Technologies
- Ferroelectric and Piezoelectric Materials
- Tactile and Sensory Interactions
- Advanced Text Analysis Techniques
- Thermal Expansion and Ionic Conductivity
- Lipoproteins and Cardiovascular Health
- Teleoperation and Haptic Systems
- Advanced ceramic materials synthesis
- Robot Manipulation and Learning
- Wireless Body Area Networks
- Soft Robotics and Applications
- Full-Duplex Wireless Communications
- Hyperglycemia and glycemic control in critically ill and hospitalized patients
- Diabetes, Cardiovascular Risks, and Lipoproteins
- Natural Language Processing Techniques
University of Massachusetts Amherst
2024
Pusan National University Yangsan Hospital
2016-2023
Seoul National University
2014-2022
Samsung (South Korea)
2021
Seoul Media Institute of Technology
2016-2019
Yeungnam University
2000
Korea Institute of Science and Technology
1990
In this letter, an electrically small quasi-isotropic antenna using folded split-ring resonators is investigated. The based on (SRRs) to achieve a quasiisotropic radiation pattern the electric and magnetic dipole current of SRR. Interdigital capacitors are used make size more compact, coupling structure applied improve characteristics SRR antenna. electrical has ka = 0.41 at 888 MHz 1.8% fractional bandwidth. measured gain deviation (Δ) 5.2 dB efficiency higher than 81% in
Abstract Latest developments in thin‐film electronics have put skin the limelight. Integration of multiple sensors and wireless power transferring ability are cardinal components for continuous acquisition human signals, enabling higher level applications wearable healthcare AR/VR devices. Skin sensor is considerably influenced by target body parts users where it attached, thus face various design adjustments best performance. However, most using conventional fabrication methods a fixed...
In this communication, we provide the efficiency bound of radiative wireless power transmission (WPT) for several types practical receiving antennas. The optimal current distribution transmitting surface is analytically derived. addition, maximum transfer (PTE) and shape base station are found in terms area distance. Examples applying proposed theory to three mobile antennas shown results compared with those previous reports, demonstrating significant differences. indicate that optimum on...
This paper presents a new position-based adaptive impedance control (PAIC) scheme of cleaning unit for novel wall-climbing mobile robotic platform (ROPE RIDE), which can climb up high-rise building with the help rope ascender and two propellers thrusters. To guarantee performance proposed ROPE RIDE, it is crucial to maintain constant contact force between various types walls. Compared existing methods, PAIC method not only simple implement but also robust against external disturbances such...
A dualband quasi‐isotropic antenna is presented. It based on the split‐ring‐resonators (SRRs), which provide a radiation pattern with an electrically small size. For operation, SRRs are placed orthogonally to reduce mutual coupling between elements. folded dipole structure applied SRR, therefore, input impedance at each band can be easily tuned. Both simulated and measured results The show operation (792 1124 MHz), high efficiency (higher than 86 85.5%), compact size ( ka = 0.47 792 moderate...
This study assessed the 2-year clinical outcomes of patients with diabetes mellitus (DM) after acute myocardial infarction (AMI) in a cohort DIAMOND (DIabetic Acute Myocardial infarctiON Disease) registry. Clinical were compared between 1088 diabetic AMI registry stabilization MI and nondiabetic from KORMI (Korean AMI) 1 : propensity score matching using traditional cardiovascular risk factors. Stabilized defined as who did not have any events within month AMI. Primary rate major adverse...
This communication aims to obtain the maximum gain of a multi-port chassis antenna at desired direction. The beam steering algorithm provides weighting vector for achieve above goal. uses conventional least squares (LSs) method and theory characteristic modes (CMs) find efficient multiport antenna. Owing orthogonal properties CMs, following two advantages emerge: 1) simple LS solution without computation matrix inversion 2) physical meaning this is equivalent narrowband time-reversal...
In this paper, each document is represented by a weighted graph called text relationship map. the graph, node represents vector of nouns in sentence, an undirected link connects two nodes if sentences are semantically related, and weight on value similarity between pair sentences. The can be computed as inner product corresponding elements. based word overlap importance map, aggregate similarity, defined sum weights links connecting it to other we present Korean summarization system using...
In this paper, a compact quasi-isotropic antenna with enhanced bandwidth for radio frequency (RF) energy harvesting applications is presented. The pattern achieved using split ring resonators (SRRs) and the folded dipole structure. Two (FSRRs) are implemented orthogonally to reduce mutual coupling, each resonance placed closely widen bandwidth. measured 5% ka = 0.47. gain deviations (Δ) 4.6 dB 4.0 at 863 MHz 888 MHz, respectively.
Skin Electronics In article number 2106329, Seung Hwan Ko and co-workers report a rewritable wearable electronics manufacturing platform that is capable of simultaneously evolving its structure by laser direct drawing erasing. This device concurrently adapts to change in users purpose the making optimization, modification, expansion, which further applied measuring human physiological signals motions.
This communication presents a method for the theoretical analysis of radiative wireless power transmission (R-WPT) in lossy environments. We identified efficiency bounds specific receiver antennas when available area was limited. In addition, optimal currents were obtained and used to determine proper location polarization transmitting array. It found that fields emitted from mode are an important factor determining bound. To understand R-WPT with media better, proposed framework applied two...
Isotropic antennas which can radiate a power into all direction and provide full spatial coverage have drag attention for modern wireless applications such as transfer, wearable antennas, access point radio frequency energy harvesting. Since an isotropic antenna with polarization of is impossible to implement in practice, many researchers designed quasi-isotropic by implementing electric dipoles magnetic [1, 2]. The especially mobile applications, need be compact multiband operation....
Receiver operating characteristic (ROC) curves of HDL-C for MACE and cardiac death. (DOCX 346Â kb)