Abstract: A fault detection method, includes the following steps. A target sequence is received, the target sequence includes several data. A first moving average operation is performed on the target sequence to establish a first moving average sequence. A second moving average operation is performed on the target sequence to establish a second moving average sequence. A difference operation between the first moving average sequence and the second moving average sequence is performed to obtain a difference sequence, the difference sequence includes several difference values. An upper limit value is set. When one of the difference values is greater than the upper limit value, the target sequence is determines as abnormal.

Abstract: A laser interferometer system includes a beam splitter to split a laser beam into first and second beam sets, a first retroreflector mounted to an object to reflect the first beam set, a first detecting device for detecting movements of the object in x-, y- and z-axis directions based on the reflected first beam set, a second retroreflector mounted to the object to reflect the second beam set, and a second detecting device for detecting rotations and movements of the object with respect to the y- and z-axis directions based on the reflected second beam set. The movements of the object in the z-axis direction obtained by the first and second detecting devices are used to obtain a rotation of the object with respect to the x-axis direction.

Abstract: A laser interferometer system includes a beam splitter to split a laser beam into first and second beam sets, a first retroreflector mounted to an object to reflect the first beam set, a first detecting device for detecting movements of the object in x-, y- and z-axis directions based on the reflected first beam set, a second retroreflector mounted to the object to reflect the second beam set, and a second detecting device for detecting rotations and movements of the object with respect to the y- and z-axis directions based on the reflected second beam set. The movements of the object in the z-axis direction obtained by the first and second detecting devices are used to obtain a rotation of the object with respect to the x-axis direction.

Abstract: A communication device includes a main circuit board, a cable, and an active antenna device. The cable is configured to deliver both a DC (Direct Current) control signal and an RF (Radio Frequency) signal. The active antenna device includes a comparator, a transmission path, a reception path, and an antenna element. The comparator recovers the DC control signal. The antenna element selects the transmission path or the reception path according to the recovered DC control signal, so as to transmit or receive the RF signal.

Abstract: A reader is provided, including a power amplifier (PA), a low-noise amplifier (LNA), a circulator, an auto-tuning matching network, and a control circuit. The PA emits a first RF transmission signal. The LNA transmits a first RF induced signal corresponding to the first RF transmission signal. The circulator is coupled between the PA and LNA, transmits the first RF transmission signal to an RF connection terminal or receives the first RF induced signal from the RF connection terminal. The auto-tuning matching network is coupled to the circulator, matches impedances between the circulator and the RF connection terminal. The control circuit is coupled to the auto-tuning matching network, adjusts the auto-tuning matching network to match impedances between the circulator and the RF connection terminal.

Abstract: A radio-frequency identification reader device including a plurality of antennas, a switch module, a coaxial cable, and a reader is provided. The switch module is electrically connected to the antennas. The coaxial cable is electrically connected to the switch module. The reader transmits a DC voltage, a control signal, and a radio-frequency signal to the switch module through the coaxial cable. The switch module generates an operation voltage by the DC voltage and the control signal. The switch module selects one of the antennas as a preset antenna by the control signal and drives the preset antenna by the radio-frequency signal.

Abstract: A reader is provided, including a power amplifier (PA), a low-noise amplifier (LNA), a circulator, an auto-tuning matching network, and a control circuit. The PA emits a first RF transmission signal. The LNA transmits a first RF induced signal corresponding to the first RF transmission signal. The circulator is coupled between the PA and LNA, transmits the first RF transmission signal to an RF connection terminal or receives the first RF induced signal from the RF connection terminal. The auto-tuning matching network is coupled to the circulator, matches impedances between the circulator and the RF connection terminal. The control circuit is coupled to the auto-tuning matching network, adjusts the auto-tuning matching network to match impedances between the circulator and the RF connection terminal.

Abstract: A radio-frequency identification reader device including a plurality of antennas, a switch module, a coaxial cable, and a reader is provided. The switch module is electrically connected to the antennas. The coaxial cable is electrically connected to the switch module. The reader transmits a DC voltage, a control signal, and a radio-frequency signal to the switch module through the coaxial cable. The switch module generates an operation voltage by the DC voltage and the control signal. The switch module selects one of the antennas as a preset antenna by the control signal and drives the preset antenna by the radio-frequency signal.

Abstract: A multi-beam interferometer displacement measuring system has a light source module, a resonator module and a detecting device. The light source module has an emitter and a polaroid sheet. The emitter emits a non-polarizing beam. The polaroid sheet receives and transforms the non-polarizing beam into a polarizing beam. The resonator module receives the polarizing beam and has a coated glass panel, a corner cube prism and a wave-delay plate. The coated glass panel receives and reflects the polarizing beam. The corner cube prism receives and reflects the polarizing beam to the coated glass panel to form a resonant cavity. The wave-delay plate is mounted between the coated glass panel and the corner cube prism to receive the polarizing beam. The detecting device faces the coated glass panel to receive the interferential stripes formed in the resonator module and has a polarizing beam splitter, two power detectors and a signal processor.

Abstract: A multi-beam interferometer displacement measuring system has a light source module, a resonator module and a detecting device. The light source module has an emitter and a polaroid sheet. The emitter emits a non-polarizing beam. The polaroid sheet receives and transforms the non-polarizing beam into a polarizing beam. The resonator module receives the polarizing beam and has a coated glass panel, a corner cube prism and a wave-delay plate. The coated glass panel receives and reflects the polarizing beam. The corner cube prism receives and reflects the polarizing beam to the coated glass panel to form a resonant cavity. The wave-delay plate is mounted between the coated glass panel and the corner cube prism to receive the polarizing beam. The detecting device faces the coated glass panel to receive the interferential stripes formed in the resonator module and has a polarizing beam splitter, two power detectors and a signal processor.

Abstract: The invention provides a method for implementing varying service quality grades in a network switch. First, a plurality of users of the network switch is classified into a plurality of service quality grades according to a contributing factor of the plurality of the users. Each of the plurality of users is then connected to the network switch via one of a plurality of ports of the network switch according to its service quality grade. An original priority of a packet in the network switch is then determined. An adjusted priority of the packet is then determined according to both the original priority of the packet and a priority adjustment table of an ingress port of the packet. Each of the plurality of ports has a corresponding priority adjustment table, and each of the priority adjustment tables includes a mapping relationship between the original priority and the adjusted priority.

Abstract: A control system for packet transmission. A forward control unit receives a packet providing a port count through an input port and implements a lookup operation. A queue control unit determines whether the port count is greater than a first predetermined value, and, if not, outputs the packet through a first port, and, if so, sends a first message. A multicast forward control unit receives the first message, adds one to a first packet count, determines whether the first packet count is greater than a threshold value, and, if so, sends a stop forward message to the forward control unit but does not send a grant message. The forward control unit receives the stop forward message and does not transmit subsequent packets to the first port but to a second port directly.

Abstract: A method for implementing packet en-queuing and de-queuing processes in a network switch is provided. The method comprises the following steps. First, an en-queuing process and a de-queuing process are divided into a plurality of en-queuing and de-queuing stages. The en-queuing process of a plurality of en-queued packets is then processed with each of the plurality of en-queued packets processed in one of the plurality of en-queuing stages simultaneously, and every one of the plurality of en-queued packets passes through all of the plurality of en-queuing stages sequentially to complete the en-queuing process. The de-queuing process of a plurality of de-queued packets is then processed with each of the plurality of de-queued packets processed in one of the plurality of de-queuing stages simultaneously, and every one of the plurality of de-queued packets passes through all of the plurality of de-queuing stages sequentially to complete the de-queuing process.

Abstract: A method for implementing varying service quality grades in a network switch is provided, comprises the steps of: classifying a plurality of users of the network switch into a plurality of service quality grades according to a contributing factor of the plurality of the users; connecting each of the plurality of users to the network switch via one of a plurality of ports of the network switch according to its service quality grade; determining an original priority of a packet in the network switch; and determining an adjusted priority of the packet according to both the original priority of the packet and a priority adjustment table of an ingress port of the packet. Each of the plurality of ports has a corresponding priority adjustment table, and each of the priority adjustment tables includes a mapping relationship between the original priority and the adjusted priority.

Abstract: A wireless communication device includes multiple properly arranged indication members. Thus, the indication members may be operated corresponding to the strength of the local RF (radio frequency) signal, so that the user may directly learn the strength of the local RF signal easily, rapidly and instantaneously, so as to decide whether to transmit or receive the data or not, or to take other procedures, thereby preventing from incurring unnecessary time consumption, and thereby enhancing the working efficiency. In addition, the method for directly indicating the strength of a signal for a wireless communication device includes the steps of: querying a signal strength value; determining a control value according to the signal strength value; and using the control value to control operation of the multiple indication members.

Abstract: A wireless communication device includes multiple properly arranged indication members. Thus, the indication members may be operated corresponding to the strength of the local RF (radio frequency) signal, so that the user may directly learn the strength of the local RF signal easily, rapidly and instantaneously, so as to decide whether to transmit or receive the data or not, or to take other procedures, thereby preventing from incurring unnecessary time consumption, and thereby enhancing the working efficiency. In addition, the method for directly indicating the strength of a signal for a wireless communication device includes the steps of: querying a signal strength value; determining a control value according to the signal strength value; and using the control value to control operation of the multiple indication members.