Abstract: The present invention relates to a speed-control knife structure with straight in-and-out motion, which includes a housing, an inner blade holder, an upper guide plate, a knife assembly, a push control member, two push blocks, and a trigger clip. Users can control the blade extension by applying controlled force with their hand. As long as the hand continues to apply force to the control part, the timing of the blade's extension can be managed. When no force is applied, the elastic force generated by pulling the elastic member can instantly pulls the push block located far from the blade exit, and the push block then pushes the sliding block. This allows the blade to quickly protrude from the blade exit to deter or react immediately, thereby enhancing personal safety.

Abstract: The present invention provides a smart mobile device having a dual-window displaying function. This smart mobile device comprises a first displaying region, a second displaying region, a separation bar, at least one status bar and at least one operation bar.

Abstract: An audio management method and an implementation in an Android Operating System are provided for allowing an electronic device to manipulate audio control of a multiple-window system and for allowing a user to manipulate audio control of execution environments corresponding to each of the plurality of windows, such as switching to a mute mode, switching to a normal audio mode, raising volume, and/or decreasing volume, and various sound processing, etc. The multiple-window system can be implemented by a multiple-window system with a plurality of windows in a single electronic device, or can be implemented by a multiple-device system including an electronic device connecting with another remote device wherein the remote device is used as an extended window. The electronic device can maintain a plurality of execution environments, wherein each of the plurality of execution environments is corresponding to a window system.