A flexible patch-type strain sensor based on polyaniline for continuous monitoring of pulse waves

S Kang, VP Rachim, JH Baek, SY Lee, SM Park - IEEE Access, 2020 - ieeexplore.ieee.org
A flexible, patch-type strain sensor is described for continuous monitoring of pulse waves.
The proposed sensor exploits the piezo-resistivity of the conductive polymer, polyaniline (PANI…

Real-time multiaxial strain mapping using computer vision integrated optical sensors

S Hong, VP Rachim, JH Baek, SM Park - npj Flexible Electronics, 2023 - nature.com
Soft strain sensors pose great potential for emerging human–machine interfaces. However,
their real-world applications have been limited due to challenges such as low reproducibility, …

Unobtrusive, cuffless blood pressure monitoring using a soft polymer sensor array with flexible hybrid electronics

VP Rachim, S Kang, JH Baek, SM Park - IEEE Sensors Journal, 2021 - ieeexplore.ieee.org
The state-of-the-art systems for blood pressure (BP) monitoring often use cuffed-based rigid
sensory systems, bulky electronics, multiple measurement sites, and intermittent …

Dual-loop two-step ZQ calibration for dynamic voltage–frequency scaling in LPDDR4 SDRAM

CK Lee, J Lee, K Kim, JS Heo, JH Baek… - IEEE Journal of Solid …, 2018 - ieeexplore.ieee.org
This paper presents a dual-loop two-step ZQ calibration scheme with a 20-nm DRAM
process to support dedicated supply voltages ( $V_{DD}$ and $V_{DDQ}$ ). The proposed …

Cuffless Blood Pressure Estimation Model Using Clustering Techniques

JH Baek, B Lee, VP Rachim, J Jang, S Kim… - IEEE Sensors …, 2023 - ieeexplore.ieee.org
This study introduces a clustered algorithm for estimating blood pressure (BP) using
electrocardiographic and photoplethysmographic data obtained from 1675 subjects, corresponding …

High sampling rate smartphone-PPG via built-in rolling shutter image sensor

VP Rachim, JH Baek, Y Kim, Y Kim… - IEEE Internet of Things …, 2022 - ieeexplore.ieee.org
Recent advancement of CMOS camera image sensor (CIS) on smartphone brings a
significant improvement to the IoT-based mobile healthcare technology in the form of CIS-…

Achieving highly efficient kesterite solar cells using simultaneous surface Ge substitution and rear interface engineering strategies

MC Baek, JS Jang, VC Karade, MP Suryawanshi… - Chemical Engineering …, 2024 - Elsevier
The progress in the device performance of kesterite-based thin-film solar cells (TFSCs) have
been stagnant due to unstable rear contact properties and large open circuit voltage (V oc )-…

Dual-loop 2-step ZQ calibration for dedicated power supply voltage in LPDDR4 SDRAM

…, KH Kim, JS Heo, GH Cha, JH Baek… - 2017 IEEE Asian …, 2017 - ieeexplore.ieee.org
This paper presents a dual-loop 2-step ZQ calibration scheme with 20nm DRAM process to
support dedicated supply voltage (VDD, VDDQ). The proposed calibration scheme maintains …

A sub-0.85V, 6.4GBP/S/Pin TX-Interleaved Transceiver with Fast Wake-Up Time Using 2-Step Charging Control and VOHCalibration in 20NM DRAM Process

JH Baek, CK Lee, K Kim, DS Moon… - … IEEE Symposium on …, 2018 - ieeexplore.ieee.org
A sub-0.85V, 6.4Gb/s TX-interleaved transceiver with fast wake-up time using 2-step
charging control and a V OH calibration scheme is implemented using 20nm DRAM process. …

A 5Gb/s/pin 16Gb LPDDR4/4X Reconfigurable SDRAM with Voltage-High Keeper and a Prediction-based Fast-tracking ZQ Calibration

…, CK Lee, DS Moon, K Kim, JH Baek… - 2019 Symposium on …, 2019 - ieeexplore.ieee.org
A 5Gb/s/pin 16Gb LPDDR4/4X reconfigurable SDRAM with a self-mode detection scheme,
a voltage-high keeper (VHK) for un-terminated load and a prediction-based fast-tracking ZQ …