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2. Charge-driven transtive devices via electric field control of magnetism in a helimagnet

Author

Chai, Yisheng, Shang, Dashan, Chun, SaeHwan, Sun, Young, and Kim, KeeHoon

Subjects
Condensed Matter - Materials Science, Condensed Matter - Strongly Correlated Electrons
Abstract

Transtor and memtranstor are the fourth basic linear and memory elements, which allows direct coupling of charge (q) to magnetic flux ({\phi}) via linear and non-linear ME effects, respectively. It is found here that large variation of magnetization by electric field is realized in both linear and nonlinear hysteretic styles in a magnetoelectric Y-type hexaferrite Ba0.5Sr1.5Zn2(Fe0.92Al0.08)12O22 single-crystal. Moreover, based on the spin current model, the underlying microscopic mechanisms for generating the two types of linear and nonlinear M vs E curves are understood as E induced changes of cone angle and sign of P respectively, establishing the charge-driven transtor and memtranstor in the Y-type hexaferrite system. This work points to a promising pathway to develop unique circuit functionalities using the magnetoelectric materials., Comment: 4 figures, Accepted by Physical Review Applied

Published
2021

5. Local Explosion Detection and Infrasound Localization by Reverse Time Migration Using 3-D Finite-Difference Wave Propagation

Author

Fee, David, Toney, Liam, Kim, Keehoon, Sanderson, Richard W, Iezzi, Alexandra M, Matoza, Robin S, De Angelis, Silvio, Jolly, Arthur D, Lyons, John J, and Haney, Matthew M

Subjects
infrasound, location, explosion, volcano, ground-coupled airwaves, numerical modeling, Geology, Geophysics, Physical Geography and Environmental Geoscience
Abstract

Infrasound data are routinely used to detect and locate volcanic and other explosions, using both arrays and single sensor networks. However, at local distances (

Published
2021

6. Action Feasibility Learning with Cell-Based Multi-Object Representation for Task and Motion Planning

Author

Kang, Junsu, Chung, Wan Kyun, Kim, Keehoon, Kacprzyk, Janusz, Series Editor, Gomide, Fernando, Advisory Editor, Kaynak, Okyay, Advisory Editor, Liu, Derong, Advisory Editor, Pedrycz, Witold, Advisory Editor, Polycarpou, Marios M., Advisory Editor, Rudas, Imre J., Advisory Editor, Wang, Jun, Advisory Editor, Ang Jr, Marcelo H., editor, Asama, Hajime, editor, Lin, Wei, editor, and Foong, Shaohui, editor

Published
2022
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11. Real-Time Mapping of Sensed Textures into Vibrotactile Signals for Sensory Substitution

Author

Park, Jaeyoung, Choi, Woo-seong, Kim, Keehoon, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Jiming, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Hirche, Sandra, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Liang, Qilian, Series Editor, Martin, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Möller, Sebastian, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zhang, Junjie James, Series Editor, Kajimoto, Hiroyuki, editor, Lee, Dongjun, editor, Kim, Sang-Youn, editor, Konyo, Masashi, editor, and Kyung, Ki-Uk, editor

Published
2019
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20. Biohybrid 3D Printing of a Tissue‐Sensor Platform for Wireless, Real‐Time, and Continuous Monitoring of Drug‐Induced Cardiotoxicity (Adv. Mater. 11/2023)

Author

Yong, Uijung, primary, Kim, Donghwan, additional, Kim, Hojoong, additional, Hwang, Dong Gyu, additional, Cho, Sungkeon, additional, Nam, Hyoryung, additional, Kim, Sejin, additional, Kim, Taeyeong, additional, Jeong, Unyong, additional, Kim, Keehoon, additional, Chung, Wan Kyun, additional, Yeo, Woon‐Hong, additional, and Jang, Jinah, additional

Published
2023
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29. sEMG-Based Gesture Recognition Using Temporal History

Author

Hong, Chaerin, Park, Seongsik, and Kim, Keehoon

Abstract

Surface electromyography (sEMG) patterns have been decoded using learning-based methods that determine complicated nonlinear decision boundaries. However, overlapping classes in sEMG pattern recognition still degrade the classification accuracy because they cannot be separated by the decision boundaries. We hypothesized that certain overlapping classes can be separated while tracing the temporal history of sEMG patterns. Therefore, a novel post-processing method is proposed to adjust classification errors using the separated patterns from the temporal history of overlapping classes. The proposed method confirms the confidence of the prediction result by calculating the instantaneous pattern separability for the sequential sEMG input. The prediction result with high separability pattern is considered to have a high confidence of being correct (reliable). This result is stored for adjusting the next sEMG input. When the subsequent prediction is identified as having low confidence (unreliable), the predicted result is adjusted using the stored reliable predicted results. The proposed method adds an adjustment step to an existing classifier (maximum likelihood classifier (MLC), k-nearest neighbor (KNN), and support vector machine (SVM)), such that it can be attached to the back-end regardless of the type of classifier. Ten subjects performed 13 types of hand gestures, including overlapping patterns. The overall classification accuracy was enhanced to 88.93%(+8.12%p, MLC), 91.31%(+7.68%p, KNN), and 99.65%(+11.63%p, SVM) after the implementation of the proposed post-processing. Additionally, a faster and more accurate gesture classification was achieved with accuracy enhancement before gesture completion as 85.62%(+4.23%p, MLC), 89.77%(+4.23%p, KNN), and 97.62%(+11.12%p, SVM).

Published
2023
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32. Atmospheric waves and global seismoacoustic observations of the January 2022 Hunga eruption, Tonga

Author

Matoza, Robin S., primary, Fee, David, additional, Assink, Jelle D., additional, Iezzi, Alexandra M., additional, Green, David N., additional, Kim, Keehoon, additional, Toney, Liam, additional, Lecocq, Thomas, additional, Krishnamoorthy, Siddharth, additional, Lalande, Jean-Marie, additional, Nishida, Kiwamu, additional, Gee, Kent L., additional, Haney, Matthew M., additional, Ortiz, Hugo D., additional, Brissaud, Quentin, additional, Martire, Léo, additional, Rolland, Lucie, additional, Vergados, Panagiotis, additional, Nippress, Alexandra, additional, Park, Junghyun, additional, Shani-Kadmiel, Shahar, additional, Witsil, Alex, additional, Arrowsmith, Stephen, additional, Caudron, Corentin, additional, Watada, Shingo, additional, Perttu, Anna B., additional, Taisne, Benoit, additional, Mialle, Pierrick, additional, Le Pichon, Alexis, additional, Vergoz, Julien, additional, Hupe, Patrick, additional, Blom, Philip S., additional, Waxler, Roger, additional, De Angelis, Silvio, additional, Snively, Jonathan B., additional, Ringler, Adam T., additional, Anthony, Robert E., additional, Jolly, Arthur D., additional, Kilgour, Geoff, additional, Averbuch, Gil, additional, Ripepe, Maurizio, additional, Ichihara, Mie, additional, Arciniega-Ceballos, Alejandra, additional, Astafyeva, Elvira, additional, Ceranna, Lars, additional, Cevuard, Sandrine, additional, Che, Il-Young, additional, De Negri, Rodrigo, additional, Ebeling, Carl W., additional, Evers, Läslo G., additional, Franco-Marin, Luis E., additional, Gabrielson, Thomas B., additional, Hafner, Katrin, additional, Harrison, R. Giles, additional, Komjathy, Attila, additional, Lacanna, Giorgio, additional, Lyons, John, additional, Macpherson, Kenneth A., additional, Marchetti, Emanuele, additional, McKee, Kathleen F., additional, Mellors, Robert J., additional, Mendo-Pérez, Gerardo, additional, Mikesell, T. Dylan, additional, Munaibari, Edhah, additional, Oyola-Merced, Mayra, additional, Park, Iseul, additional, Pilger, Christoph, additional, Ramos, Cristina, additional, Ruiz, Mario C., additional, Sabatini, Roberto, additional, Schwaiger, Hans F., additional, Tailpied, Dorianne, additional, Talmadge, Carrick, additional, Vidot, Jérôme, additional, Webster, Jeremy, additional, and Wilson, David C., additional

Published
2022
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45. Cable-Driven Haptic Interface With Movable Bases Achieving Maximum Workspace and Isotropic Force Exertion

Author

Yoon, Jinhyuk, Lee, Donghyeon, Bang, Junyong, Shin, Hyung Gon, Chung, Wan Kyun, Choi, Seungmoon, and Kim, Keehoon

Abstract

Haptic interactions play an essential role in education to enhance learning efficiency; however, haptic information for virtual educational content remains lacking. This article proposes a planar cable-driven haptic interface with movable bases that can display isotropic force feedback with maximum workspace extension on a commercial screen display. A generalized kinematic and static analysis of the cable-driven mechanism is derived by considering movable pulleys. Based on the analyses, a system including movable bases is designed and controlled to maximize the workspace subject to isotropic force exertion for the target screen area. The proposed system is evaluated experimentally as a haptic interface represented by the workspace, isotropic force-feedback range, bandwidth, Z-width, and user experiment. The results indicate that the proposed system can maximize workspace to the target rectangular area and exert isotropic force up to 94.0% of the theoretical computed one within the workspace.

Published
2023
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49. Quantitative comparison of bilateral teleoperation systems using [micro]-synthesis

Author

Kim, Keehoon, Cavusoglu, M. Cenk, and Chung, Wan Kyun

Subjects
Microbiological synthesis -- Analysis
Abstract

This paper presents a quantitative comparison framework for bilateral teleoperation systems (BTSs) that have different dynamic characteristics and sensory configurations for a given task-dependent performance objective (TDPO). [micro]-synthesis is used to develop the framework since it can efficiently treat systems containing uncertainties and disturbances. The framework consists of: 1) a feasibility test and 2) a comparison methodology using prioritized TDPOs. As the formulation used is based on [micro]-synthesis, the system, operator, and environment models are represented in the form of linear nominal models with frequency-dependent multiplicative uncertainties. This framework is applied to a BTS including an uncertain human operator and environment in a practical case study. The validity of the proposed quantitative framework is confirmed through experiments. The proposed framework can be used as a tool to design BTSs, especially when there are constraints in designing drive mechanisms and choosing sensory configurations. Index Terms--Bilateral teleoperation system, haptic interface, quantitative comparison, [micro]-synthesis, task-dependent performance objective.

Published
2007

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