Abstract: An operation method and a radio device for controlling a power switch of a radio based on moving speed. The radio device includes a speed estimator and an operator. The speed estimator is used for estimating the moving speed of the radio device, and the operator is used for comparing the moving speed of the radio device with a speed threshold value so as to turn on/off the power switch of the radio device. The power switch of the radio device can be controlled based on the moving speed so as to decrease the time the radio device stays on, thus reducing the power consumption of the radio device.

Abstract: The present invention relates to a system, and a method for time synchronization with low power consumption and high accuracy. The system comprises a plurality of devices for time synchronization. Each device comprises a GPS receiver, a microprocessor, and an oscillator. The microprocessor generates a drift per second according to the difference between the PPS signal and the clock signal, and calibrates the clock signal constantly according to drift per second. The GPS receiver is turned off when the drift per second is obtained, and then is turned on after a pre-determined time period for updating the drift per second.

Abstract: The present invention relates to a system, and a method for time synchronization with low power consumption and high accuracy. The system comprises a plurality of devices for time synchronization. Each device comprises a GPS receiver, a microprocessor, and an oscillator. The microprocessor generates a drift per second according to the difference between the PPS signal and the clock signal, and calibrates the clock signal constantly according to drift per second. The GPS receiver is turned off when the drift per second is obtained, and then is turned on after a pre-determined time period for updating the drift per second.

Abstract: An operation method and a radio device for controlling power switch of radio based on moving speed are provided. The radio device comprises a speed estimator and an operator. The speed estimator is used for estimating the moving speed of the radio device, and the operator is used for comparing the moving speed of the radio device with a speed threshold value so as to turn on/off the power switch of the radio device. Thereby, the power switch of the radio device can be controlled based on the moving speed so as to decrease the time the radio device staying on, thus reducing the power consumption of the radio device.

Abstract: A method for inviting a challenged entity to provide input concerning a sinograph includes displaying, to the challenged entity, a first region having an image of a challenge sinograph; displaying at least a first event-sensitive region, the first event-sensitive region having an image of a real root of the challenge sinograph; and displaying at least a second event-sensitive region. The second event sensitive region has an image of a faux root of the challenge sinograph.

Abstract: Methods and apparatuses for improved data transmission control protocols. Acknowledgment streams are used by a sender process to generate various estimates of eligible transmission rates that are fair to other processes competing for bandwidth across a common network. In addition, the acknowledgment streams are used in conjunction with various other standard transmission control protocol metrics to adapt a filter for use on the rate estimates. Additional improvements in throughput may no be had by measuring the overall capacity of the computer network using packet pair dispersion measurements and adaptive network probing. In addition, the methods may be adapted for both packet transmission and video streaming applications.