Abstract: A method for secure data transmission and a system using the same method are provided. The method includes: coupling a programmable logic device to a server; receiving a first data packet by the server; inputting the first data packet into a machine learning model to predict a protocol type and a command type of the first data packet by the server; verifying whether the protocol type and the command type are correct by the server; adding the first data packet to a data packet information set in response to the protocol type and the command type being correct by the server; generating a filtering rule according to the data packet information set and deploying the filtering rule in the programmable logic device by the server; and performing the secure data transmission according to the filtering rule by the programmable logic device.

Abstract: A voltage tracking circuit is provided. The voltage tracking circuit includes first and second P-type transistors and a control circuit. The drain of the first P-type transistor is coupled to a first voltage terminal. The gate and the drain of the second P-type transistor are respectively coupled to the first voltage terminal and a second voltage terminal. The control circuit is coupled to the first and second voltage terminals and generates a control voltage according to the first voltage and the second voltage. The sources of the first and second P-type transistors are coupled to an output terminal of the voltage tracking circuit, and the output voltage is generated at the output terminal. In response to the second voltage being higher than the first voltage, the control circuit generates the control signal to turn off the first P-type transistor.

Abstract: A wheeled jumping robot includes a body with two wheels, and a board is connected between the two wheels. A driving unit and a jumping unit are respectively connected on two sides of the board. The jumping unit has two rails, and a tubular member is located between the two rails and connected to a threaded rod. A bridge is connected between two rails. Rollers are located between a threaded portion of the threaded rod and a tapered contact face of the bridge. When the threaded rod is rotated, the rollers move toward a pre-set position, the bridge compresses resilient members on the two rails. When the tubular member moves toward the pre-set position, the rollers are separated from the threaded rod due to the tapered contact face, the resilient members bounce back. The wheeled jumping robot includes a processing unit for being communicated with a remote control unit.

Abstract: A wheeled jumping robot includes a body with two wheels, and a board is connected between the two wheels. A driving unit and a jumping unit are respectively connected on two sides of the board. The jumping unit has two rails, and a tubular member is located between the two rails and connected to a threaded rod. A bridge is connected between two rails. Rollers are located between a threaded portion of the threaded rod and a tapered contact face of the bridge. When the threaded rod is rotated, the rollers move toward a pre-set position, the bridge compresses resilient members on the two rails. When the tubular member moves toward the pre-set position, the rollers are separated from the threaded rod due to the tapered contact face, the resilient members bounce back. The wheeled jumping robot includes a processing unit for being communicated with a remote control unit.

Abstract: A device for removing joint from axle includes a seat disposed on a plate for supporting the axle, and a positioning device to position the axle on the seat. A follower includes a casing having a chamber to receive the joint of the axle and having a slot communicating with the chamber of the casing to slidably receive the axle. A moving device may move the follower away from the seat, to disengage the joint from the axle. A cover may be secured on the casing to prevent the joint from flying out of the casing. The positioning device includes a housing disposed on the plate, to support an actuator on the plate and above the seat. The housing includes a board having a passage to slidably receive the rod of the actuator.

Abstract: A device for removing joint from axle includes a bar slidably supported on a track and adjustable relative to the track to support the axle, an arm having a hammer movable toward and to engage with the joint, and to disengage the joint from the axle, for allowing the joint to be easily and quickly disengaged from the axle without much labor work. One or more inserts may be selectively or changeably secured to the bar, to support axles of different widths or diameters. A bolt is threaded with the bar and driven by a motor to move the bar relative to the track.