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Electronic structure of detwinned BaFe2As2from photoemission and first principles
Kim, Yeongkwan,Oh, Hyungju,Kim, Chul,Song, Dongjoon,Jung, Wonsig,Kim, Beomyoung,Choi, Hyoung Joon,Kim, Changyoung,Lee, Bumsung,Khim, Seunghyun,Kim, Hyungjoon,Kim, Keehoon,Hong, Jongbeom,Kwon, Yongseun American Physical Society 2011 Physical review. B, Condensed matter and materials Vol.83 No.6
Keehoon Kim,Colgate, J. E. IEEE 2012 IEEE transactions on neural systems and rehabilita Vol.20 No.6
<P>In this study, we hypothesized that haptic feedback would enhance grip force control of surface electromyography (sEMG)-controlled prosthetic hands for targeted reinnervation (TR) amputees. A new miniature haptic device, a tactor, that can deliver touch, pressure, shear, and temperature sensation, allows modality-matching haptic feedback. TR surgery that creates sensory regions on the patient's skin that refer to the surface of the missing limb allows somatotopic-matching haptic feedback. This paper evaluates the hypothesis via an sEMG-controlled virtual prosthetic arm operated by TR amputees under diverse haptic feedback conditions. The results indicate that the grip force control is significantly enhanced via the haptic feedback. However, the simultaneous display of two haptic channels (pressure and shear) does not enhance, but instead degrades, grip force control.</P>
Kim, Young‐,Hoo,Park, Saerom,Won, Keehoon,Kim, Hyung Joo,Lee, Sang Hyun John Wiley Sons, Ltd 2013 Journal of chemical technology and biotechnology Vol.88 No.6
<P><B>Abstract</B></P><P><B>Background</B></P><P><B>Bacterial cellulose (BC)‐based materials have many potential applications in the biomedical field because of their inherent biocompatibility. Carbon nanotubes (CNTs) have been used as electrode materials owing to their high electrical conductivity. In this study, BC‐CNT composite electrodes were prepared simply by directly filtering CNTs through BC hydrogel and vacuum drying the BC hydrogel containing the CNTs. Glucose oxidase (GOx) was immobilized on BC‐CNT composite electrodes.</B></P><P><B>Results</B></P><P><B>Cyclic voltammograms revealed that the BC‐CNT‐GOx electrodes had a pair of well‐defined peaks. The formal redox potential peak was –496 mV (vs. Ag/AgCl), which agreed well with that of FAD/FADH<SUB>2</SUB>. This result clearly indicates that direct electron transfer occurred between GOx and the BC‐CNT composite electrode. In addition, the GOx immobilized on the electrode retained its catalytic ability to oxidize glucose.</B></P><P><B>Conclusion</B></P><P><B>Conductive BC‐CNT composite films form a good biocompatible electrode for the direct electron transfer of glucose oxidase. They have many potential applications in the biomedical field such as biosensors, biofuel cells, and bioelectronic devices. © 2012 Society of Chemical Industry</B></P>
Keehoon Kim,Wan Kyun Chung,Cavusoglu, M.C. IEEE 2009 IEEE transactions on robotics Vol.25 No.5
<P>This paper investigates a novel position-sensor-based force reflection framework for multi-degree-of-freedom (DOF) bilateral teleoperation systems in unstructured environments. The conventional position-sensor-based force reflection method, which is known as position error feedback, may generate grossly inaccurate force reflection directions during collisions involving the slave manipulator links. The proposed restriction space projection framework calculates the instantaneous restriction space to provide the accurate force reflection, regardless of kinematic dissimilarity (KDS) conditions of bilateral teleoperation systems. Simulation results confirmed the validity of the proposed framework in a KDS bilateral teleoperation system under various constraint conditions.</P>
Kim, Jong-Seok,Kim, Woo Sik,Choi, Han-Gyu,Jang, Byungki,Lee, Keehoon,Park, Jong-Hwan,Kim, Hwa-Jung,Cho, Sang-Nae,Shin, Sung Jae Society for Leukocyte Biology 2013 Journal of leukocyte biology Vol.94 No.4
<P>RpfB regulates innate immunity and activates adaptive immunity through TLR4; a potential design for more effective vaccines.</P>
Simple and Fast Compensation of sEMG Interface Rotation for Robust Hand Motion Recognition
Kim, Minjae,Kim, Keehoon,Chung, Wan Kyun IEEE 2018 IEEE transactions on neural systems and rehabilita Vol.26 No.12
<P>Surface electromyography (sEMG) measurements have demonstrated the potential to recognize complex hand motions. In addition, sEMG enables natural recognition without disturbing movements, and thus, can be used in various fields such as teleoperation, assistant robots, and prosthetic hands. However, sEMG signals highly depend on electrode placements due to the complex muscle structures. A shift of the electrode can lead to inconsistent signal measurement. Thus, sEMG-based recognition is not practical for applications that require long-term and repeated usage. This paper proposes compensation of sEMG interface rotation for robust motion recognition. Once the relationship between sEMG signals and motions is trained, additional training for different electrode configurations is not necessary for a band-type interface. The proposed process is simple and fast. The interface rotation can be compensated for by performing only a single motion for approximately 2 s. The single motion for compensation is dependent on the muscle properties of the user. Generally, ulnar deviation may work. To demonstrate the proposed compensation, recognition of five hand motions is conducted. The experimental results indicate that the proposed compensation can cover the overall range of rotation. In addition, the proposed compensation is validated with a transradial amputee.</P>