A5100757893- Electrochemical sensors and biosensors
- Advanced Sensor and Energy Harvesting Materials
- Energy Harvesting in Wireless Networks
- Wireless Power Transfer Systems
- Advanced biosensing and bioanalysis techniques
- Conducting polymers and applications
- Microwave Engineering and Waveguides
- Neuroscience and Neural Engineering
- Wireless Body Area Networks
- EEG and Brain-Computer Interfaces
- 3D IC and TSV technologies
- UAV Applications and Optimization
- Electromagnetic Compatibility and Noise Suppression
- Biosensors and Analytical Detection
- Non-Invasive Vital Sign Monitoring
- Diverse Approaches in Healthcare and Education Studies
- Integrated Circuits and Semiconductor Failure Analysis
- Nanoplatforms for cancer theranostics
- Electronic Packaging and Soldering Technologies
- Advanced MIMO Systems Optimization
- Concrete and Cement Materials Research
- Advanced Wireless Network Optimization
- Advanced Nanomaterials in Catalysis
- ZnO doping and properties
- Millimeter-Wave Propagation and Modeling
Gachon University
2018-2025
Purdue University West Lafayette
2015-2018
Korea Aerospace University
2018
Korea Advanced Institute of Science and Technology
2009-2010
Nortel (Canada)
2007-2009
In a multiple-receiver wireless power transfer (WPT) system, determining the condition for uniform distribution at high efficiency is challenging issue. this paper, selective WPT technique using magnetic resonance coupling (MRC) introduced smart delivery in system. The proposed method selectively and exclusively delivers to only one designated receiver among multiple receivers, eliminating cross-coupling effect unbalanced division problem across receivers. This achieved by separating...
An ultra-low-power wirelessly powered radiofrequency (RF) transceiver for wireless sensor network is implemented using 180-nm CMOS technology. We propose a 98-μW 457.5-MHz transmitter with output radiation power of -22 dBm. This utilizes 915-MHz powering RF signal by frequency division true-single-phase-clock divider to generate the carrier very low consumption and small die area. The can support up 5-Mb/s data rate. telemetry system uses an eight-stage Cockcroft-Walton rectifier convert dc...
We present a batteryless, crystal-free, time division multiple access (TDMA) synchronized multinode wireless body sensor node (WBSN) system-on-chip (SoC), referred to as Bionode, for continuous and real-time telemetry of electromyograms (EMGs), enabling intuitive upper limb prosthesis control by an amputee. The SoC utilizes state the art in supercapacitive RF energy harvesting, biosensing analog-front-end, switchingoptimized SAR ADC, ultra-low-power transceiver, clock circuits. SoCs are with...
Significance The ability to endow the surface of existing objects with desired electronic features enables many emerging applications such as Internet Things (IoT). Despite significant progress in optimization thin-film materials and construction schemes, realization high-performance electronics on arbitrary place through a wafer-scale batch process is limited. This paper presents wafer-recyclable, environment-friendly transfer printing that physical delivery large-scale integrated circuits...
We report novel three-dimensional (3D) microcavity array electrodes for high-capacitance all-solid-state microsupercapactiors. The arrays are formed in a polymer substrate via plasma-assisted reactive ion etching (RIE) process and provide extra sidewall surface areas on which the active materials grown form of nanofibers. This 3D structure leads to an increase areal capacitance by factor 2.56 15-μm-deep cavity etching, agreeing well with prediction. fabricated microsupercapactiors exhibit...
The acquisition of physiological data are essential to efficiently predict and treat cardiac patients before a heart attack occurs effectively expedite motor recovery after stroke. This goal can be achieved by using wearable wireless sensor network platforms for real-time healthcare monitoring. In this paper, we present signal device smartphone-based software platform processing monitor cloud server access everyday ECG/EMG is implemented in compact size (diameter: 30 mm, thickness: 4.5 mm)...
The pursuit of hardware-based security solutions has highlighted the true random number generator (TRNG). Various physical phenomena, from noise generation to quantum physics complexities, have been explored for generation. arc discharge light-induced TRNG (ALTRNG) is introduced, featuring wavelength-dependent photocurrent and irradiation. A bipolar photo-responsive photodetector (BPPD) differentiates "1" "0" states, producing highly bits validated by National Institute Standards Technology...
To achieve the continuous surveillance capable multirotor type solar-powered unmanned aerial vehicle (UAV), we develop photovoltaic power management system (PPMS) which manages from (PV) modules and a battery pack to support of UAV. estimate possible flight time UAV, use concept state charge (SOC) estimation based on extended Kalman filter (EKF) complementary (CF) then calculate by using slope SOC graph during hovering mode. According results, estimated increases up 54.14 min at 11:00 a.m....
Miniaturization and wireless continuous glucose monitoring are key factors for the successful management of diabetes. Electrochemical sensors very versatile can be easily miniaturized monitoring. The authors report a microneedle-based enzyme-free electrochemical sensor painless microneedles (MNs) fabricated consist 3 × 5 sharp stainless-steel electrode array configuration. Each MN in has 575 µm 150 height width, respectively. A glucose-catalyzing layer, porous platinum black, was...
In this letter, a compact branch-line-based quadrature hybrid coupler using line miniaturization technique for 28-GHz application is presented. Coplanar waveguide-based artificial transmission lines are used in the miniaturization, and T-equivalent circuit models exploited to elaborate on optimization method. A multistage T-model utilized eliminate need lumped elements, improve bandwidth performance, simplify fabrication process. To validate proposed approach, designed was fabricated glass...
This article proposes a wireless power transfer (WPT) system for variant receiver (Rx) configuration, distribution ratio, load, and distance with multiple relays, each of which is connected to resistive load. Each Rx relay transfers an adjacent acts as while its local load consumes power. We develop methodology the design WPT resonators that achieve optimum efficiency receivers ratios, loads, distances. The configuration extended general m×n, two-dimensional grid large area coverage. A...
The electrocardiogram (ECG) is an effective tool for monitoring various health conditions, and animal studies using ECG have uncovered new information about complex diseases. However, electrophysiological signals in small animals such as mice has been challenging. In this study, we present a simple, minimally invasive, inexpensive measurement sensory system that offers real-time data acquisition while performing surgery. We developed miniaturized, wearable device utilizes miniature-sized,...