Abstract: A cloud radio access network system includes remote signal sources, a baseband processing unit pool, an access management server, a software defined network controller and a network signal forwarder. Each remote signal source is configured to transmit an access signal. The baseband processing unit pool provides a baseband processing signal. The access management server provides an access state signal. Different maximum transmission rates are transmitted via the access state signal. When the baseband processing unit pool has authenticated one remote signal source, the baseband processing unit pool transmits an authentication notification signal to the access management server. Then, the access management server informs the software defined network controller according to the authentication notification signal to increase an upper limit of a signal transmission rate between the baseband processing unit pool and the authenticated remote signal source to a higher one of the maximum transmission rates.

Abstract: A method for estimating a variation in a preload applied to a linear guideway of a machine tool includes steps of: a) obtaining, via each of vibration sensors, first and second vibration signals that are generated according to detection of vibration of a table disposed on the linear guideway respectively at first and second time instants; b) determining, via the computation module, first and second natural frequencies based on a theoretical mode shape and respectively on the first and second vibration signals; and c) determining, via the computation module, the variation in the preload based on the first and second natural frequencies.

Abstract: A scooter is provided. The scooter comprises a frame assembly including a main frame for a user, an extendable frame movably connected to the main frame and configured to be extendable away from the main frame at an interface at which the main frame and the extendable frame meet, and a wheel assembly connected to the frame assembly. The extendable frame forms a cargo space at an extended position.

Abstract: A device for monitoring healthy status of machinery mounts is provided, which may include a plurality of vibration detectors, a signal acquisition device and a signal processor. The vibration detectors may detect the vibration signals from of a machine device, where the machine device may include a plurality of machinery mounts. The signal acquisition device may receive the vibration signals of the vibration detectors. The signal processor may execute a modal frequency analysis process to analyze the vibration signals of the vibration detectors, and calculate a vibration mode corresponding to the natural frequency of the machinery mounts in current status to serve as the test mode; then, the signal processor may compare the test mode with a reference mode to determine the healthy status of the machinery mounts, where the reference mode is corresponding to the natural frequency of the machinery mounts in the optimized status.

Abstract: A vehicle includes a body, a removable cab, a cargo movement subsystem, and a computing device. The removable cab is attachable to the body. The computing device includes a processor and a memory. The computing device is programmed to actuate at least one vehicle subsystem to move the vehicle to deliver cargo stored in the cab and the cargo movement subsystem move the cargo. The cargo movement subsystem is arranged to move the cargo from the cab to a position accessible from an exterior of the vehicle.

Abstract: A scooter includes a lower body with a first end and a second end, a rear wheel rotatably supported by the first end, an elongated front body with a lower end and an upper end, a guide fixed within the front body extending from the lower end to the upper end, an attachment member pivotably fixed to the second end of the lower body and engaged by the guide, and a front wheel rotatably supported by the lower end.

Abstract: A spindle speed adjusting device in machining is provided, which may include a plurality of signal detection modules, a signal capturing module and a signal processing module. Each of the signal detection modules may keep measuring the vibration signals in machining. The signal capturing module may capture the vibration signals. The signal processing module may execute a transmissibility analysis to obtain the transmissibility between the signal detection modules, and execute a frequency response fitting according to the transmissibility to obtain a plurality of system dynamic parameters, and then execute a stability lobe diagram analysis to calculate the optimized spindle speed of the machining tool so as to make the machining tool operate at the optimized spindle speed. The signal processing module may repeatedly execute the transmissibility analysis, the frequency response fitting and the stability lobe diagram analysis to keep updating the optimized spindle speed until the machining process ends.

Abstract: A method for estimating a variation in a preload applied to a linear guideway of a machine tool includes steps of: a) obtaining, via each of vibration sensors, first and second vibration signals that are generated according to detection of vibration of a table disposed on the linear guideway respectively at first and second time instants; b) determining, via the computation module, first and second natural frequencies based on a theoretical mode shape and respectively on the first and second vibration signals; and c) determining, via the computation module, the variation in the preload based on the first and second natural frequencies.

Abstract: A spindle speed adjusting device in machining is provided, which may include a plurality of signal detection modules, a signal capturing module and a signal processing module. Each of the signal detection modules may keep measuring the vibration signals in machining. The signal capturing module may capture the vibration signals. The signal processing module may execute a transmissibility analysis to obtain the transmissibility between the signal detection modules, and execute a frequency response fitting according to the transmissibility to obtain a plurality of system dynamic parameters, and then execute a stability lobe diagram analysis to calculate the optimized spindle speed of the machining tool so as to make the machining tool operate at the optimized spindle speed. The signal processing module may repeatedly execute the transmissibility analysis, the frequency response fitting and the stability lobe diagram analysis to keep updating the optimized spindle speed until the machining process ends.

Abstract: A scooter is provided. The scooter comprises a frame assembly including a main frame for a user, an extendable frame movably connected to the main frame and configured to be extendable away from the main frame at an interface at which the main frame and the extendable frame meet, and a wheel assembly connected to the frame assembly. The extendable frame forms a cargo space at an extended position.

Abstract: A personal transportation device comprises a frame, a wheel pivotably connected to a frame and switchable between a driving configuration and a flying configuration, a motor to rotate the wheel; and an automatic cruise module. The automatic cruise module is configured to control the wheel and guide the personal transportation device to fly from a first location to a second location according to a designated route as an unmanned aircraft.