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발목의 해부학적 회전구조를 구현하고 제어하는 발목재활로봇
김인우(Inwoo Kim),김규진(Gyujin Kim),권경민,장재용(Jeung Jang),임서균(Yim Seo Gyun),조대기(Daeki Cho),이수홍(Soo-Hong Lee),Gapsun Kim 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
When physical ability is reduced due to aging and various diseases, the athletic ability of the ankle, which plays a very important role in walking, is significantly weakened. Various ankle exoskeleton robots have been developed to assist and rehabilitate ankles with reduced mobility, but most do not implement the correct rotation axis of the ankle, making it difficult to transmit the correct force and increase the risk of injury. In this study, the anatomical axis of rotation of the ankle joint was structurally implemented. Two linear actuators were installed in the embodied structure to control the two rotation axes of the robot. By installing a load cell between the linear actuator and the structure, the magnitude of the torque transmitted by the robot to the human can be calculated inverse dynamic. The ankle exoskeleton robot can effectively simulate and support all movements of the human ankle.
Ankle intention detection algorithm using electromyography signal
Kim Inwoo,Lee Taehoon,Lee Soo-Hong 한국CDE학회 2021 Journal of computational design and engineering Vol.8 No.5
In this study, an ankle intention detection algorithm was developed to calculate the torque the user wants to exert from the ankle starting from the user’s EMG signal. Since the subtalar joint axis of the ankle is very important for stability, the intent detection algorithm also calculates the torque of the eversion motion of the subtalar joint axis. A dry EMG sensor was used to measure the EMG signal, and an ankle biaxial torque measurement device was manufactured to measure the ankle torque to perform the experiment. The experiment was conducted on four healthy subjects (mean ± SD: height, 177.6 ± 7.3 cm; weight 70.2 ± 8.9 kg; and age, 27 ± 2 years), and the EMG signals and ankle torque were measured. Using the experimental results and a neural network, we developed an intention detection algorithm. When you input an EMG signal, the algorithm estimates the torque of eversion, dorsiflexion, and plantar flexion. The error of the algorithm is 0.37 Nm (subtalar) and 0.57 Nm (talocrural), which is 0.5% (subtalar) and 1.5% (talocrural) of the torque required for walking. Using the algorithm of this study, more accurate and stable exoskeleton robot control becomes possible.
18.4%-Efficient Heterojunction Si Solar Cells Using Optimized ITO/Top Electrode
Kim, Namwoo,Um, Han-Don,Choi, Inwoo,Kim, Ka-Hyun,Seo, Kwanyong American Chemical Society 2016 ACS APPLIED MATERIALS & INTERFACES Vol.8 No.18
<P>We optimize the thickness of a transparent conducting oxide (TCO) layer, and apply a microscale mesh pattern metal electrode for high-efficiency a-Si/c-Si heterojunction solar cells. A solar cell equipped with the proposed microgrid metal electrode demonstrates a high short-circuit current density (J(sc)) of 40.1 mA/cm(2), and achieves a high efficiency of 18.4% with an open-circuit voltage (V-OC) of 618 mV and a fill factor (FF) of 74.1% as result of the shortened carrier path length and the decreased electrode area of the microgrid metal electrode. Furthermore, by optimizing the process sequence for electrode formation, we are able to effectively restore the reduction in V-OC that occurs during the microgrid metal electrode formation process. This work is expected to become a fundamental study that can effectively improve current loss in a-Si/c-Si heterojunction solar cells through the optimization of transparent and metal electrodes.</P>
Domestic and foreign disinfection industry trends in response to COVID-19
Jisoo kim(김지수),Jungsook Choi(최정숙),Jihoon Seo(서지훈),Inwoo Choi(최인우),Philjoon Kim(김필준),Jongryul Sohn(손종렬) 환경독성보건학회 2021 한국독성학회 심포지움 및 학술발표회 Vol.2021 No.5
Since the COVID-19, there has been a growing interest in disinfection in the space where many people stay for a long time, with the spread of new infections caused by Cluster Infection in multi-use facilities in Korea soaring. Since COVID-19, natural ventilation and mechanical ventilation alone have difficulty in controlling bio-aerosols in multi-use facilities, and considering water-borne infections as an infection path of COVID-19, a diverse disinfection process is required. Since the declaration of COVID-19 pandemic, attempts to replace human resources with robots or drones have been increasing due to the spread of non-face-to-face culture that minimizes interpersonal contact. Domestic disinfection is carried out through disinfectants approved by the Ministry of Environment for coronavirus, such as cleaning, spraying disinfection through dispensing drugs, and direct disinfection. Disinfecting spray is also avoided by the Central Disaster and Safety Countermeasures Headquarters in Korea and the WHO. This is because the effect of disinfection is low except in the space where the disinfectant is directly contacted, and the disinfectant stimulates the skin, eyes, and respiratory system, which is not recommended due to the high risk of exposure to the human body. Although most of the domestic and international development and commercialized disinfection technologies have UV lamp and spray disinfection methods, they have clear limitations such as weak spray disinfection effects or ozone from ultraviolet lamps. the disinfection technology needs to be considered for the harmful effects of human exposure of chemicals in disinfectants that are made for the purpose of removing microorganisms, so continuous interest and verification of the technology is needed.