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Liao Jianwen,Meng Wei,Liu Zhifa,Cui Jinqiang 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.4
This paper presents a lightweight convolutional neural network architecture based hand gesture recognition for micro aerial vehicle (MAV) applications, which is able to detect hand gestures accurately and quickly convert into commands to control the MAV’s fl ight. In order to improve detection accuracy, a new activation function, named as adjustable-arctangent linear units (ALU) is proposed combined with linear stretching anchors (LSA) for accurate hand gesture detection. To achieve high detection speed, a lightweight neural network architecture (LNNA) is proposed and well trained. A large number of experiments show that by using LSA and ALU, the proposed solution can achieve the highest detection accuracy performance compared with commonly used methods. Moreover, compared with currently used YOLOv3, LNNA can improve the detecting speed by about 48.9% on 2080Ti GPU, and increase the speed to 11.67 frames per second on NVIDIA Jetson TX2. Flight experiments on MAVs also proved the eff ectiveness of the proposed hand gesture detection method.
A new thermosensitive polymer as nonadhesive liquidembolism material
Chengru Zhao,Qin Wang,Jianwen Meng,Wenguang Liu,Zuoqin Liu 한국물리학회 2005 Current Applied Physics Vol.5 No.5
Thermosensitive copolymers poly(NIPAm-co-NNPAm) ofN-isopropylacrylamide (NIPAm) withN-n-propylacrylamide(NNPAm) were synthesized by free radical copolymerization using potassium persulfate (KPS) and sodium sulte (Na2SO3) as ini-tiator. FTIR and1H NMR conrmed the structure of the copolymer poly(NIPAm-co-NNPAm). The dynamic mechanical analysisand dynamic contact angle were determined. The lower critical solution temperature (LCST) of copolymers was investigated byDSC. The results indicated the LCST decreased with the higher NNPAm contents. The phase transition of the copolymer solutionoccurred at body temperature within 30 s and the copolymers changed into soft solids. The copolymer could be used as a new non-adhesive liquid embolism material for the intervenient therapy of the cerebral arterio-venous malformation (AVM)..