Abstract: A dynamic facial expression recognition (FER) method based on a Dempster-Shafer (DS) theory improves a feature extraction effect of an expression video through multi-feature fusion, and deeply learns an imbalanced dynamic expression feature by using the DS theory, multi-branch convolution, and an attention mechanism. Compared with other methods, the dynamic FER method scientifically and effectively reduces an impact of sample imbalance on expression recognition, fully utilizes a spatio-temporal feature to mine potential semantic information of the video expression to perform expression classification, thereby improving reliability and accuracy and meeting a demand for the expression recognition.

Abstract: A movement support includes a base. An air inlet is formed in the base. A drainage plate is installed on the base. A first heat dissipating flow channel communicated with the air inlet is formed in the base on one side of the drainage plate. A second heat dissipating flow channel communicated with the air inlet is formed in the base on the other side of the drainage plate. The first heat dissipating flow channel and the second heat dissipating flow channel between the drainage plate and the air inlet are communicated with each other.

Abstract: The invention provides a double-power-supply switching control system for a welding machine and method. The welding machine double-power-supply switching control method comprises the steps of: continuously detecting and modifying an input voltage signal by a signal modification unit; under the control of a control unit, judging, by a judgment unit, whether to perform voltage doubling, controlling to execute voltage doubling switching action, and locking an actual input voltage mode of a welding machine by a locking unit; and finally outputting matched output current by a power supply output unit.

Abstract: A movement support includes a base. An air inlet is formed in the base. A drainage plate is installed on the base. A first heat dissipating flow channel communicated with the air inlet is formed in the base on one side of the drainage plate. A second heat dissipating flow channel communicated with the air inlet is formed in the base on the other side of the drainage plate. The first heat dissipating flow channel and the second heat dissipating flow channel between the drainage plate and the air inlet are communicated with each other.

Abstract: The invention provides a double-power-supply switching control system for a welding machine and method. The welding machine double-power-supply switching control method comprises the steps of: continuously detecting and modifying an input voltage signal by a signal modification unit; under the control of a control unit, judging, by a judgment unit, whether to perform voltage doubling, controlling to execute voltage doubling switching action, and locking an actual input voltage mode of a welding machine by a locking unit; and finally outputting matched output current by a power supply output unit.