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Ryun-Han Koo

Seoul National University

Kwanak-gu

Seoul, 151-742

Korea, Republic of (South Korea)

  • Seoul National University

SCHOLARLY PAPERS

10

DOWNLOADS

838

TOTAL CITATIONS

4

Scholarly Papers (10)

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1.

Physical Correlation between Stochasticity and Process-Induced Damage in Ferroelectric Memory Devices

Number of pages: 13 Posted: 05 Feb 2025
Ryun-Han Koo, Seungwhan Kim, Gyuweon Jung, Kangwook Choi, Sangwoo Ryu, Jangsang Kim, Jiseong Im, Sung-Ho Park, Jonghyun Ko, Sung-Tae Lee, Daewoong Kwon and Wonjun Shin
Seoul National University, Seoul National University, Seoul National University, Seoul National University, Seoul National University, Seoul National University, Seoul National University, Seoul National University, Seoul National University, Hongik University, Hanyang University and Seoul National University
Downloads 114 (621,896)

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Stochasticity, Ferroelectric tunnel junction, Low-frequency noise (LFN), 1/f noise, Trap formation, Plasma-induced damage

2.

Hafnia-Based Ferroelectric Computer Vision System with Artificial Synaptic Array

Number of pages: 39 Posted: 20 Jan 2025
Eun Chan Park, Jangsang Kim, Jonghyun Ko, Manh-Cuong Nguyen, Minsuk Song, Ki-Ryun Kwon, Ryun-Han Koo, Wonjun Shin and Daewoong Kwon
Hanyang University, Seoul National University, Seoul National University, Inha University, Hanyang University, Hanyang University, Seoul National University, Seoul National University and Hanyang University
Downloads 113 (630,858)

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ferroelectric thin-film transistors, indium-gallium-zinc oxide channel, compute-in-memory, neuromorphic, vision transformer

3.

Interface Percolation and Random Trap Generation in Ferroelectric Memory: A Two-Step Degradation Mechanism Explored Through Low-Frequency Noise Spectroscopy

Number of pages: 11 Posted: 27 Feb 2025
Ryun-Han Koo, Wonjun Shin, Seungwhan Kim, Sangwoo Ryu, Gyuweon Jung, Jangsang Kim, Jiseong Im, Sung-Ho Park, Kangwook Choi, Jonghyun Ko, Sung-Tae Lee, Daewoong Kwon and Jong-Ho Lee
Seoul National University, Seoul National University, Seoul National University, Seoul National University, Seoul National University, Seoul National University, Seoul National University, Seoul National University, Seoul National University, Seoul National University, Hongik University, affiliation not provided to SSRN and affiliation not provided to SSRN
Downloads 109 (645,052)

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Stochasticity, Ferroelectric, Low-frequency noise (LFN), Trap Generation, Interface Percolation

4.

Ising Solver Using Vertical NAND Flash Memory

Number of pages: 34 Posted: 08 Dec 2025
Sung-Ho Park, Yeongheon Yang, Jong-Won Back, Jiseong Im, Ryun-Han Koo, Jonghyun Ko, Dongseok Kwon and Wonjun Shin
Seoul National University, SK hynix Inc, affiliation not provided to SSRN, Seoul National University, Seoul National University, Seoul National University, affiliation not provided to SSRN and Seoul National University
Downloads 94 (720,278)

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Ising machine, V-NAND flash memory, Combinatorial optimization problem, Hopfield neural network

5.

Stochasticity in Ferroelectric Memory Devices with Different Bottom Electrode Crystallinity

Number of pages: 10 Posted: 19 Jan 2024
Ryun-Han Koo, Wonjun Shin, Gyuweon Jung, Dongseok Kwon, Jae-Joon Kim, Daewoong Kwon and Jong-Ho Lee
Seoul National University, Seoul National University, Seoul National University, Seoul National University, Seoul National University, Hanyang University and Seoul National University
Downloads 80 (803,225)

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Low-frequency noise (LFN), Stochastic read noise, Current fluctuation, Transient response, Ferroelectric tunnel junction (FTJ), Hafnium zirconium oxide (HfZrO2)

6.

Ultrathin Tio2-Interfaced Hafnia Ferroelectric Transistor for Large-Scale Neuromorphic Computing

Number of pages: 35 Posted: 15 Apr 2025
Changhyeon Han, Ryun-Han Koo, Wonjun Shin, Jangsaeng Kim, Been Kwak, Jiseong Im, Sojin Kim, Seung-yong Lee, Youngho Kang and Daewoong Kwon
Hanyang University, Seoul National University, Seoul National University, Sogang University, Hanyang University, Seoul National University, Hanyang University, Hanyang University, Incheon National University and Hanyang University
Downloads 74 (891,180)

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ferroelectric field-effect transistor, ferroelectric HZO, interface dipole modulation, neuromorphic computing

7.

A Universal Re-Annealing Method for Enhancing Endurance in Hafnia Ferroelectric Memories: Insights from Stochastic Noise Analysis

Number of pages: 22 Posted: 12 Apr 2025
Ryun-Han Koo, Wonjun Shin, Jiseong Im, Sangwoo Ryu, Seungwhan Kim, Jangsaeng Kim, Kangwook Choi, Sung-Ho Park, Jonghyun Ko, Jongho Ji, Mingyun Oh, Gyuweon Jung, Sung-Tae Lee, Daewoong Kwon and Jong-Ho Lee
Seoul National University, Seoul National University, Seoul National University, Seoul National University, Seoul National University, Sogang University, Seoul National University, Seoul National University, Seoul National University, affiliation not provided to SSRN, Seoul National University, Seoul National University, Hongik University, affiliation not provided to SSRN and Seoul National University
Downloads 73 (860,052)

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Low-frequency noise (LFN), Read noise, Current fluctuation, Ferroelectric, Hafnium zirconium oxide (HZO)

8.

Vertical Nand Flash Memory-Based Matrix-Matrix Multiplication Scheme for Energy-Efficient Attention Score Computation

Number of pages: 19 Posted: 11 Sep 2024
Jonghyun Ko, Sung-Ho Park, Jiseong Im, Jeonghyun Kim, Ryun-Han Koo, Yeongheon Yang and Jong-Ho Lee
Seoul National University, Seoul National University, Seoul National University, Seoul National University, Seoul National University, SK hynix Inc and Seoul National University
Downloads 72 (867,774)

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Vision Transformer, Attention score, Self-attention, V-NAND flash memory, Neuromorphic Computing

9.

Chaotic Behavior of Random Telegraph Noise in Ferroelectric Devices: Impact of Downscaling and Mitigation Strategies for Neuromorphic Applications

Number of pages: 12 Posted: 08 Aug 2024
Ryun-Han Koo, Wonjun Shin, Sung-Tae Lee, Daewoong Kwon and Jong-Ho Lee
Seoul National University, Seoul National University, Hongik University, Hanyang University and Seoul National University
Downloads 66 (907,769)
Citation 2

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Random telegraph noise (RTN), Lorentzian noise, Low-frequency noise (LFN), Ferroelectric, Neuromorphic system

10.

Proposition of Optimal Self-Curing Method in Horizontal-Floating Gate Fet-Type Gas Sensors for Reliability Improvement

Number of pages: 23 Posted: 05 Jul 2023
Ryun-Han Koo, Seongbin Hong, Yujeong Jeong, Gyuweon Jung, Sung-Tae Lee, Jong-Ho Lee and Wonjun Shin
Seoul National University, Seoul National University, Seoul National University, Seoul National University, Hongik University, Seoul National University and Seoul National University
Downloads 43 (1,157,785)
Citation 2

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FET-type gas sensor, self-curing method, parasitic bipolar junction transistor, reliability