30results about How to "Inefficient data transfer" patented technology

Disclosed is a method, system and device for searching active nodes in P2P(peer to peer) streaming media system. Selectable nodes briefly and efficiently report their own subblocks information to a tracker device, such as the number of the continuous buffered subblocks, the sequence number of the first subblock of the continuous subblocks and the total number information of the buffered subblocks; the tracker device can select suitable candidate nodes for a request node according to the subblocks information of the selectable nodes, therefore the request node can determine active nodes without sending a large amount of detections to the candidate nodes; the waste of communication resources is avoided and the bandwidth cost is reduced; also, the selectable nodes can report characters of the networks where they locate, and the tracker device can select nodes in wired network to be candidate nodes first, therefore, the transmission speed of the whole P2P system is improved and the waiting delay of the request node is reduced.

Received quality detecting section 108 detects a received quality, bit determining section 111 determines whether a TPC bit is 0 or 1, amplitude reading section 112 reads a ratio of an amplitude of a signal other than the TPC bit and an amplitude of the TPC bit, accumulating section 113 determines an increase or decrease of transmit power and an amount of the increase and decrease of the transmit power using a symbol of the TPC bit for the increase or decrease, and an amplitude ratio for the amount of the increase and decrease to instruct to transmission amplifier 104, and multiplying section 114 multiplies the amplitude of the signal other than the TPC bit by a correction value corresponding to the received quality to determine the amplitude of the TPC bit.

The invention belongs to the field of image measurement, and provides a kinematic measurement method and device for a large multi-plate wave simulation system. When kinematic measurement is performed on a wave maker, a video camera is used for acquiring field images, a mark point on each wave making plate is recognized in an image processing plate, and a central position is calculated. The central position is compared with an initial position, and image shifting is calculated and transformed into displacement in a physical space according to calibration parameters. Next, data are transmitted to a computer by an EtherCAT network, and then the data are encoded and recognized. Finally, a kinematic measurement value and a target value of each wave making plate are compared and analyzed in the computer, so that kinematic information of the wave maker is acquired. The method sufficiently solves the problems of target recognition difficulty and kinematic tracking instability caused by non-uniform experimental field illumination in kinematic measurement of the wave maker, and solves the problems of large image analysis algorithm time consumption and low multi-camera system data transmission efficiency.

The invention provides a pixel drive circuit and a display device. The pixel drive circuit comprises a data writing unit, a driving unit, a compensation unit and a light-emitting unit. A first capacitor is added to a driving unit; the first end of the first capacitor is used for receiving the power supply high-voltage signal; the second end of the first capacitor is coupled with the second node; the first capacitor has a coupling effect on the driving unit; the data transmission efficiency of the driving unit in different gray scale states is reduced; high and low gray scales are switched through relatively low data transmission efficiency. Therefore, the switching capability of high and low gray scales of the pixel drive circuit is improved. Meanwhile, a first thin film transistor is additionally arranged between a micro light-emitting diode of the light-emitting unit and the driving unit; the grid electrode of the first thin film transistor is coupled with a light-emitting signal, and the drain electrode of the first thin film transistor is coupled with the first end of the micro light-emitting diode, thereby ensuring that the micro light-emitting diode is not affected by currentfluctuation of the driving unit before emitting light, and improving the display effect of the display device.

A technique for improving data security is provided. To be specific, in a memory system including an information processing apparatus and a semiconductor memory device, the semiconductor memory device has an interface section that transmits, to the information processing apparatus, data read out from a memory core according to a plurality of communication protocols having different signal transmission/reception methods. Based on a switch command inputted from the information processing apparatus, a communication protocol selection section inputs, to the interface section, a selection signal for selecting a particular communication protocol from the plurality of communication protocols.

An access control apparatus includes: a determination section; and an update section.

An output clock is provided by a logic module and at least one flip-flop based on a reference clock. Each flip-flop receives the reference clock at a corresponding clock end and changes a signal level outputted at a corresponding output port according to rising or falling edges within each period of the reference clock. The logic module performs a logic operation among signals at each output port of the flip-flops to generate the output clock synchronized with the reference clock. Thereafter the output clock can be outputted through the data path provided by the logic module, and additional logical operations can be performed between the output clock and other signals.

An object of the present invention is to provide a technique to improve the data transmission efficiency which allows correct reception of the data at the same time. A removable memory device that transmits/receives data to and from a host terminal, which includes: a clock reception section that receives a transmission/reception clock, which is used for transmitting/receiving data between the host terminal and the removable memory device, from the host terminal; a phase synchronization pattern generation section that generates a phase synchronization pattern, which is for adjusting a phase of internal reception clock which the host terminal incorporates for receiving data from the removable memory device, based on the transmission/reception clock; and a transmission section that transmits the generated phase synchronization pattern to the host terminal, and in which the phase synchronization pattern includes a first level signal which lasts for at least two cycles, and a second level signal which follows the first level signal and lasts for one cycle, is provided.

In order to transmit and receive sample data of different sampling frequencies collectively, the first row of a packet is composed of four bytes and the first and second rows are provided with headers prescribed by the IEEE1394 standard. Also, the second byte in the third row is provided with the first counted value of a data block counter and a fourth byte is provided with a next to the last counted value (DBC) of the data block counter. Further, latter half two bytes in the fourth row are provided with a value of a reference time (time stamp data). The first two bits in the fifth row are provided with values showing recording media, the fourth bits are provided with flags showing sampling frequencies, the seventh and eighth bits are provided with values showing quantized bit numbers, and the second three bytes and after are provided with sample data. The last row of the packet is provided with an error correcting code for data transmitted in and after the third row.

The invention discloses a software-defined event trigger control method for a large-scale network system under spoofing attack, which comprises the following steps: firstly, establishing a large-scale network control system model, and then introducing a dynamic weighted centralized event trigger mechanism; considering the influence of spoofing attack on network transmission data, and establishing a network attack model; a large-scale networked system model is improved based on a spoofing attack and dynamic weighted event triggering mechanism; and finally, based on a Lyapunov stability theory, obtaining a sufficiency condition for ensuring that the system is finally consistent and bounded, and obtaining an event trigger parameter and a state estimator gain by solving a linear matrix inequality. According to the method, the problem of management complexity caused by a centralized event triggering mechanism can be effectively reduced, the burden of network transmission is relieved, serious threats of spoofing attacks to a network control system are considered, and the data transmission efficiency is effectively improved.

Methods, apparatuses, and systems for data transmission are described. A sending terminal sends data and a data identification of the data to a server. The data identification is broadcasted to one or more receiving terminals through a short distance wireless communication. The receiving terminal obtains the data from the server according to the data identification. When the sending terminal needs to transmit data to multiple receiving terminals, the techniques of the present disclosure do not require the sending terminal to establish a point-to-point connection with each of the receiving terminal. Thus, the techniques of the present disclosure effectively reduce transmission time with multiple receiving terminals, improve data transmission efficiency, and lower power consumption at the sending terminal.

The invention relates to a spectrometer controller and a cascade control system and method of a distributed spectrometer. The spectrometer controller comprises a main controller, an A serial interface, a B serial interface and a spectrometer control interface, and the A serial interface, the B serial interface and the spectrometer control interface are respectively connected with the main controller. According to the invention, independent spectrometers can be cascaded for cooperative work, and the detection efficiency can be greatly improved during area light source detection.