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Chun, Sungwoo,Son, Wonkyeong,Kim, Da Wan,Lee, Jihyun,Min, Hyeongho,Jung, Hachul,Kwon, Dahye,Kim, A-Hee,Kim, Young-Jin,Lim, Sang Kyoo,Pang, Changhyun,Choi, Changsoon American Chemical Society 2019 ACS APPLIED MATERIALS & INTERFACES Vol.11 No.18
<P>Wearable and skin-attachable electronics with portable/wearable and stretchable smart sensors are essential for health-care monitoring devices or systems. The property of adhesion to the skin in both dry and wet environments is strongly required for efficient monitoring of various human activities. We report here a facile, low-cost, scalable fabrication method for skin-adhesive graphene-coated fabric (GCF) sensors that are sensitive and respond fast to applied pressure and strain. With octopus-like patterns formed on the side of the GCF that touches the skin, the GCF adheres strongly to the skin in both dry and wet environments. Using these characteristics, we demonstrate efficient monitoring of a full range of human activities, including human physiological signals such as wrist pulse and electrocardiography (ECG), as well as body motions and speech vibrations. In particular, both measurements of ECG and wrist-bending motions were demonstrated even in wet conditions. Our approach has opened up a new possibility for wearable and skin-adherent electronic fabric sensors working even in wet environments for health-care monitoring and medical applications in vitro and in vivo.</P> [FIG OMISSION]</BR>
An Improved Split-Step Method in Scaling Function Based MRTD
Jaejong Ryu,Wuseong Lee,Hachul Kim,Hyunchul Choi IEEE 2010 IEEE microwave and wireless components letters Vol.20 No.4
<P>A split-step method with four sub-steps is applied to the multiresolution time-domain scheme and combined with the dispersion-error control parameters. From the discussed numerical dispersion, it is obvious that the phase velocity an- isotropic error and absolute error of the introduced method are much lower than alternating direction implicit and the original split-step MRTD method. The results show that this method can use three times the time step of the original SS-MRTD method.</P>
Jaejong Ryu,Wuseong Lee,Hachul Kim,Hyunchul Choi 한국전자파학회JEES 2009 Journal of Electromagnetic Engineering and Science Vol.9 No.4
A three-dimensional locally one-dimensional multiresolution time-domain(LOD-MRTD) method is introduced and unconditional stability is proved analytically. The updating formulations have fewer terms on the right-hand side than those of an alternating direction implicit MRTD(ADI-MRTD). The validation of the method is presented using the resonance frequency problem of an empty cavity. The reduction of the numerical dispersion technique is also combined with the proposed method. The numerical examples show that the combined method can improve the accuracy significantly.
Reduction of Numerical Dispersion Error in 3-D ADI-MRTD Method With the Coarse Mesh
Jaejong Ryu,Wuseong Lee,Jugab Lee,Yeonkwan Moon,Hachul Kim,Hyunchul Choi IEEE 2009 IEEE microwave and wireless components letters Vol.19 No.8
<P>In order to reduce the numerical dispersion in three-dimensional alternating-direction implicit multiresolution time-domain scheme, a correction procedure is introduced. The numerical dispersion relation and the anisotropic correction parameters are considered. The reduction of the numerical dispersion is investigated for single frequency problem and wide-band simulation with the coarse mesh.</P>