People

Artificial Vision & Neural Engineering

Lab Members

Hyeonhee Roh, M.S.

Ph.D. Candidate in Electronic Engineering at Korea University (Mar 2021 – present)
(Co-advising with Prof. Hyung-Min Lee at Korea University)

hyeonhee@kist.re.kr
Research Interests

Neural engineering, Patch-clamp recording, Optogenetics, Bio-MEMS/NEMS, Triboelectric energy harvesting

Education
Ph.D. Electrical and Electronic Engineering, Korea University, Seoul, South Korea (Mar.2021 - Present)
M.S. Electronic Engineering, Kyung Hee University, Yongin, South Korea (Aug.2019)
B.S. Electronic Engineering, Kyung Hee University, Yongin, South Korea (Feb. 2018)
Experience

Researcher in Brain Science Institute                                                                   Nov.2019 - Present

KIST (Korea Institute of Science and Technology), Seoul, South Korea

Advisor: Maesoon Im, Ph.D.


Graduate researcher in electronic engineering                                                    Mar.2018 - Sep. 2020

Kyung Hee University, Yongin, South Korea

Advisior: Professor Daewoon Kim, Ph.D.


​Undergraduate researcher in Electronic Engineering                                          Mar.2017 - Feb. 2018

Kyung Hee University, Yongin, South Korea

Advisor: Professor Daewon Kim, Ph.D.

Patents

1. Maesoon Im, Hyeonhee Roh, Na Min An and Jae Hun Kim, "Artificial vision expression parameter automation learning system method for improving artificial vision device" Korean Patent Granted #2021-0172619, Dec. 8, 2021.


2. Daewon Kim and Hyeonhee Roh, "Genterator harvesting energy from Sunlight, Wind, Raindrop" Korean Patent Granted #10-2020-0021659, Mar. 2, 2020. (Application #10-2018-0097242, Aug. 21, 2018)

Publication

(* denotes co-first authors)


2024 

  1. Daniel Kim+, Roh Hyeonhee+, Hyung-min Lee, Sang Jeong Kim, and Maesoon Im. “ Localization of hyperpolarization-activated cyclic nucleotide-gated channels in the vertebrate retinas across species and their physiological roles” Frontiers in Neuroanatomy 18 (2024).

2023

  1. Hyerim Kim*, Hyeonhee Roh*, Seong-Woo Kim, Sang-Heon Kim, Kangwon Lee, Maesoon Im, and Seung Ja Oh, “Effective protection of photoreceptor via attenuating inflammatory microglia using an injectable inflammation-responsive hydrogel in retina degeneration model,” npj Regenerative Medicine, vol. 8, Art. No. 68 (17pp), Dec. 2023.
  2. Yunseo Son, Hyeonhee Roh, and Maesoon Im, “Effects on retinal stimulation of the geometry and the insertion location of penetrating electrodes,” IEEE Transactions on Neural Systems and Rehabilitation Engineering (TNSRE), vol. 31, pp. 3803-3812, Sep. 2023.
  3. So-Bin Shin*, Kyeong-Taek Nam*, Hyeonhee Roh*, Shinyong Shim*, Yong-Kweon Kim, Seung-Ki Lee, Maesoon Im, and Jae-Hyoung Park, “Fabrication of a Transparent Penetrating 3D Microelectrode Array with Two Different Heights for Both Neural Stimulation and Recording,” Sensors and Actuators B Chemical, vol. 393, Art. No. 134184 (13pp), Oct. 2023. (IF = 9.21, JCR < 10%, Ranked first in the field of INSTRUMENTS & INSTRUMENTATION)
  4. Hyeonhee Roh, Yanjinsuren Otgondemberel, Jeonghyeon Eom, Daniel Kim, and Maesoon Im, “Electrically-evoked network-mediated responses of retinal ganglion cells in the retinal degeneration 8 (rd8) mouse model,” Frontiers in Cellular Neuroscience, vol. 17, Art. No. 1115703 (16 pp), Feb. 2023.


2022 

  1. Hyeonhee Roh, Yanjinsuren Otgondemberel, and Maesoon Im, “Short-pulses of epiretinal prostheses evoke network-mediated responses in retinal ganglion cells by stimulating presynaptic neurons,” Journal of Neural Engineering, vol. 19, Art. No. 055006 (16 pp), Sep. 2022.
  2. Jaya Dilip Badadhe, Hyeonhee Roh, Byung Chul Lee, Jae Hun Kim, and Maesoon Im, “Ultrasound stimulation for visual prostheses,” Frontiers in Cellular Neuroscience, vol. 16, Art. No. 971148 (9 pp), Aug. 2022.
  3. Sein Kim*, Hyeonhee Roh*, and Maesoon Im, “Artificial Visual Information Produced by Retinal Prostheses,” Frontiers in Cellular Neuroscience, vol. 16, Art, No. 911754 (8 pp), Jun. 2022.


2021 

  1. Hyeonhee Roh*, Jin Soo Park*, Dong-Hyun Kang*, Yoing Jun Yoon*, Seing Min Kwak, Byng Chul Lee, and Maesoon Im, “Fabrication of high-density out-of-plain microneedle arrays with various heights and divers cross-sectional shapes,” Nano-Micro Letters, vol. 14, Art. No. 24 (19 pp), Dec. 2021. 
  2. Yanjinsuren Otgondemberel*, Hyeonhee Roh*, and Maesoon Im, “Spiking characteristics of network-mediated responses arising in direction-selective ganglion cells of rabbit and mouse retinas,” IEEE Transactions on Neural Systems and Rehabilitation Engineering (TNSRE), vol. 29, pp. 2445-2455, Nov. 2021.
  3. Dong-Hwi Choi, Hyeonhee Roh*, Maesoon Im, Dong-Woo Jee “A 4.49nW/Pixel Light-to-Stimulus Duration Converter-Based Retinal Prosthesis Chip,” IEEE Transactions on Biomedical Circuits and Systems (TBioCAS), vol. 15, no. 6, pp. 1140-1148, Nov. 2021. 
  4. Inkyum Kim, Jonghyeon Yun, Seungju Jo, Youngsu Kim, Hyeonhee Roh, and Daewon Kim, “All-in-one energy harvesting system with triboelectric and thermoelectric hybrid generator and Au nanoflower supercapacitor for a light stimulation to the wildlife,” International Journal of Energy Research, vol. 46, no. 2, pp. 1444-1456, Feb. 2022.
  5. Jonghyeon Yun, Hyeonhee Roh, Jieun Choi, Dongyeop Gu, and Daewon Kim, “Disk triboelectric nanogenerator based non-volatile memory towards smart identification system,” Advanced Functional Materials, vol. 31, no. 28, pp. 2102536, Jul. 2021. (IF = 18.8, JCR < 5%)
  6. Inkyum Kim, Hyeonhee Roh, Wontae Choi, and Daewon Kim, “Air-gap embedded triboelectric nanogenerator via surface modification of non-contact layer using sandpapers,” Nanoscale, vol. 13, no. 19, pp. 8837-8847, May. 2021. (IF = 7.8, JCR < 15%) 


2020

  1. Su Thiri San, Seungju Jo, Hyeonhee Roh, Nagabandi Jayababu, Inkyum Kim, Youngsu Kim, and Daewon Kim, “Hybridized generator: freely movable ferromagnetic nanoparticle-embedded balls for a self-powered tilt and direction sensor,” Extreme Mechanics Letter, vol. 11, pp. 101063, Nov. 2020.
  2. Seungju Jo, Inkyum Kim, Nagabandu Jayababu, Hyeonhee Roh, Youngsu Kim, and Daewon Kim, “Antibacterial and soluble paper-based skin-attachable human motion sensor using triboelectricity,” ACS Sustainable Chemistry & Engineering, vol. 8, no. 29, pp. 10786-10794, Jun. 2020. (IF = 7.6, JCR < 10%)
  3. Nay Yee Win Zaw, Hyeonhee Roh, Inkyum Kim, Tae Sik Goh, and Daewon Kim, “Omnidirectional triboelectric nanogenerator operated by weak wind towards a self-powered anemoscope,” Micromachines, vol. 11, no. 4, pp. 414, Apr. 2020.
  4. Inkyum Kim, Hyeonhee Roh, Jinsoo Yu, Nagabandu Jayababu, and Daewon Kim, “Boron nitride nanotube-based contact electrification-assisted piezoelectric nanogenerator as a kinematic sensor for detecting the flexion-extension motion of a robot finger,” ACS Energy Letters, vol. 5, no. 5, pp. 1577-1585, Apr. 2020 (IF = 16.3, JCR < 5%)
  5. Hyeonhee Roh, Inkyum Kim, and Daewon Kim, “Ultrathin harvesting module capable of generating electrical energy during rainy, windy and sunny conditions,” Nano Energy, vol. 70, pp. 104515, Apr. 2020. (IF = 16.6, JCR < 5%)
2019 
  1. Inkyum Kim, Hyeonhee Roh, and Daewon Kim, “Willow-like portable triboelectric respiration sensor based on polyethylenimine assisted CO2 capture,” Nano Energy, vol. 65 pp. 103990, Nov. 2019. (IF = 16.6, JCR < 5%)
  2. Hyeonhee Roh, Jinsoo Yu, Inkyum Kim, Yunseok Chae, and Daewon Kim, “Dynamic analysis to enhance the performance of a rotating-disk-based triboelectric nanogenerator by injected gas,” ACS Applied Materials & Interfaces, vol. 11, no. 28, pp. 25170-25178, Jun. 2019. (IF = 8.5, JCR < 10%)
  3. Inkyum Kim, Hyeonhee Roh, Jinsoo Yu, Hyejin Jeon, and Daewon Kim†, “A triboelectric nanogenerator using silica-based powder for appropriate technology”, Sensors and Actuators A: Physical, vol. 280, pp. 85-91, Sep. 2018.
  4. Hyeonhee Roh, Inkyum Kim, Jinsoo Yu, and Daewon Kim, “Self-power dynamic sensor based on triboelectrification for tilt of direction and angle,” Sensors, vol. 18, no. 7, pp. 2384, Jul. 2018.

Conference
  1. Hyeonhee Roh, Minju Kim, Misung Kim, and Maesoon Im†, “Electric stimulation elicits photoreceptor-mediated natural responses in only a subset of OFF retinal ganglion cells for enhanced artificial vision,” The 46th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC’24), Orlando, FL, USA, Jul. 15-19, 2024.
  2. Hyeonhee Roh, Joonghoon Kang, Hyung-Min Lee, and Maesoon Im†, “Enhanced optogenetic stimulation of retinal ganglion cells with assistive electric stimulation for low optical power artificial vision,” FASEB Science Research Conferences: Retinal Neurobiology and Visual Processing, Southbridge, MA, USA, Jun. 16-21, 2024.
  3. Maesoon Im, Daniel Kim, Hyeonhee Roh, Sein Kim, Da Eun Kim, Minju Kim, Donglin Yi, Su Yeon Kim, and Seok-Kyu Kwon. “Changes of HCN channels in the retina as a function of retinal degeneration,” The 26th Annual Meeting of the Korean Society for Brain and Neural Sciences (KSBNS’23), Busan, South Korea, Sep. 6-8, 2023. 
  4. Daniel Kim, Hyeonhee Roh, Donglin Yi, Su Yeon Kim, Seok-Kyu Kwon, and Maesoon Im, “Molecular alterations in the isoforms of HCN channels within the retina during the advancement of outer retinal degeneration in rd10 mice,” The 26th Annual Meeting of the Korean Society for Brain and Neural Sciences (KSBNS’23), Busan, South Korea, Sep. 6-8, 2023. 
  5. Byung Jae Kang, Su Yeon Kim, Daniel Kim, Hyeonhee Roh, Donglin Yi, Hosung Jung, Maesoon Im, and Seok-Kyu Kwon, “Exploring the pivotal role of mitochondria in retinal degeneration,” The 26th Annual Meeting of the Korean Society for Brain and Neural Sciences (KSBNS’23), Busan, South Korea, Sep. 6-8, 2023. 
  6. Hyeonhee Roh, Maesoon Im, “A subtype of OFF retinal ganglion cells in the mouse retina elicits natural spiking activities in response to electric stimulation,” The 45th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC’ 23), Sydney, Australia, Jul. 24-27, 2023. 
  7. Na Min An, Hyeonhee Roh, Sein Kim, Jae Hun Kim, and Maesoon Im, “Reinforcement learning-based feedback framework to simulate human psychophysical experiment of prosthetic vision,” International Joint Conference on Neural Network 2023 (IJCNN’23), Gold Coast, Queensland, Australia, Jun. 18-23, 2023. 
  8. Kwangjun Kim, Minwook Kim, Hyunmin Baek, Hyeonhee Roh, Maesoon Im, Jong G. Ok, “Capillary force-assisted CNT microstructuring for biomedically applicable flexible microelectrode array,” The 2023 Material Research Society (MRS’23) Spring Meeting, San Francisco, California, USA, Apr. 10-14, 2023.
  9. Sein Kim*, Hyeonhee Roh*, and Maesoon Im, “Neural information of artificial vision varies depending on mean firing rate and spiking duration,” The 25th Annual Meeting of the Korean Society for Brain and Neural Sciences (KSBNS’22), Songdo, Incheon, Republic of Korea, May 19-21, 2022.

  10. Hyeonhee Roh*, Hyerim Kim*, Seung Ja Oh, and Maesoon Im, “Intravitreally-injected anti-inflammatory drug-containing hydrogel can effectively slow down retinal degeneration of retinitis pigmentosa mouse model,” The 25th Annual Meeting of the Korean Society for Brain and Neural Sciences (KSBNS’22), Songdo, Incheon, Republic of Korea, May 19-21, 2022.
  11. Hyeonhee Roh*, Hyunsun Song*, and Maesoon Im, “Hydrophobic and Water-Repellent Modification of Polymeric Surfaces with Co-Curing of Silica Aerogel,” The 2022 Material Research Society (MRS’22) Spring Meeting, Honolulu, Hawaii, May 23-25, 2022.
  12. Hyunsun Song*, Hyeonhee Roh*, Jae Young Kim, Byung Chul Lee, Bright Walker, Maesoon Im, “High Efficiency Organic Photovoltaics Based on Non-Fullerene Acceptors (PCE10:ITIC:Y6) for Retinal Prosthesis,” The 2022 Material Research Society (MRS’22) Spring Meeting, Honolulu, Hawaii, May 23-25, 2022.
  13. Sein Kim, Hyeonhee Roh, and Maesoon Im, “Neural information of artificial vision varies depending on mean firing rate and spiking duration,” The 2022 Association for Research in Vision and Ophthalmology (ARVO'22)  Annual Meeting, Denver, Colorado, USA, May 1-6, 2022.
  14. Hyeonhee Roh, Yanjinsuren Otgondemberel, and maesoon Im, “Electrically-evoked Responses of ON and OFF Ganglion Cells in Retinal Degeneration 8 (rd8) Mice,” The 2022 Association for Research in Vision and Ophthalmology (ARVO'22) Annual Meeting, May 1-6, 2022.
  15. Na Min An, Hyeonhee Roh, Soomin Jung, Eun Ju Kim, and Maesoon Im, “Machine learning can replace human prosthetic vision psychophysical experiment,” The 43rd Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC’21), online, Nov. 1-5, 2021.
  16. Hyeonhee Roh and Maesoon Im, “Electric stimulation evokes highly delayed network-mediated responses in OFF ganglion cells of the mouse retina,” to be presented at The 24th Annual Meeting of the Korean Society for Brain and Neural Sciences (KSBNS’21), online, May 19-20, 2021.
  17. Hyeonhee Roh, Eun ju Kim, Soomin Chung, Joon Ho Kang, Taegon Kim, and Maesoon Im, “Neural information of artificial vision varies depending on the level of spiking heterogeneity across retinal ganglion cells,” The 2021 Association for Research in Vision and Ophthalmology (ARVO) Annual Meeting, online, May 1-7, 2021.
  18. Yanjinsuren Otgondemberel, Hyeonhee Roh, and Maesoon Im, “Response characteristics of direction-selective ganglion cells to electric stimulation in rabbit and mouse retinas,” The 2021 Association for Research in Vision and Ophthalmology (ARVO’21) Annual Meeting, online, May 1-7, 2021.
  19. Yanjinsuren Otgondemberel, Hyeonhee Roh, and Maesoon Im, “Understanding the properties of electrically-elicited responses of directionally selective retinal ganglion cells for retinal prostheses,” The 23rd Annual Meeting of the Korean Society for Brain and Neural Sciences (KSBNS’20), online, Nov. 16-17, 2020.