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91results about How to "Avoid information loss" patented technology

Method for radio communication in a wireless local area network and transceiving device

Method for radio communication in a wireless local area network and transceiving device refers to wireless local area networks (WLAN) consisting of a multitude of transceiving devices of users (14, 15, 16 . . . N). Simultaneous scanning by their antenna beams in different directions by the transceiving devices (with the transceiving devices being in reception mode) and transmission of an omnidirectional signal in the form of calibration signal and data package by one of the transceiving devices of the network (with the transceiving device being in transmission mode), reception of the signal by the transceiving devices operating in reception mode and subsequent orientation of their antenna beams in the direction of signal source. The recognition and orientation is performed during the period of reception of the calibration signal. The Method increases the range of a WLAN, reduces the transmission time and improves quality and reliability of communication. Each transceiving device (1) includes at least one directional antenna (3) featuring a controllable directional pattern, switched-over by unit (4), reception / transmission mode switch (5), receiver (8), transmitter (10) and controller (11). Additionally a unit for signal detection (13) is incorporated in the device.
Owner:AIRGAIN INC

Electroencephalogram signal rapid identification method of dense deep convolutional neural network

The invention provides a method for quickly identifying EEG (Electroencephalogram) signals by using a dense deep convolutional neural network, and designs a convolutional neural network suitable for motor imagery EEG signals by combining the characteristics of time and space characteristics of the motor imagery EEG signals and using a characteristic connection method in the convolutional neural network. The convolutional neural network designed by the invention can extract the time and space features at the same time, and the outputs between different convolutional layers are connected with each other, so that the number of weights is reduced, and the purposes of overfitting resistance and feature reuse are achieved. The method comprises the steps of firstly, the filtered and resampled original data is inputted into the dense deep convolutional neural network, then the parameters of each layer of the network are updated through a back propagation and random gradient descent algorithm,finally, the network is tested, the test data is inputted into the trained network, and an output result is analyzed. Compared with a Shallow ConvNet method proposed in 2017, the signal identificationaccuracy and the kappa value are improved by 5% and 0.066%.
Owner:BEIHANG UNIV

Extraction method for influence factors of carbon exchange of ecosystem and system

The invention discloses an extraction method for influence factors of carbon exchange of an ecosystem and a system. The extraction method includes steps of 1), acquiring attribute data of carbon flux samples in a carbon flux data observation station; 2), inputting the attribute data, which are obtained in the step 1), of the carbon flux samples, selecting the optimal combination by the aid of proposed fuzzy rough and reduction integrated algorithm of shuffled frog leaping or quick fuzzy rough and reduction integrated algorithm based on importance, and finding an environmental factor set with the closest relationship with carbon flux; and 3), realizing modeling and stimulating for various environmental factors in the environmental factor set obtained from the step 2) by the aid of a neural network, and obtaining extraction rate of the environmental factors of the carbon flux. The extraction system comprises a data import module, a factor extraction module, an input module and an evaluation module. By the aid of the extraction method and the system, the range of correlation factors of the carbon flux in the researched ecosystem can be effectively reduced, research efficiency is improved, and inherent law among the environmental factors is found.
Owner:SOUTH CHINA AGRI UNIV

System and method for monitoring broadcast signals in online manner and parallelly demodulating same

The invention discloses a system and a method for monitoring broadcast signals in an online manner and parallelly demodulating the same. The particular method includes enabling the system to divide channels by the aid of digital channelization technologies, separating multiple channels of mixed digital broadcast signals from one another and outputting the separated mixed digital broadcast signals in the multiple channels; enabling a monitoring module to search signals and judge whether the signals are outputted form each channel or not by the aid of automatic signal searching technologies; connecting the channels with the outputted signals to demodulation modules to demodulate the broadcast signals. The system and the method have the advantages that digital channelized receivers and digital broadcast demodulation systems are combined with one another, the digital channelization technologies on the basis of FFB algorithms, the automatic signal searching technologies and digital orthogonal demodulation technologies are provided, accordingly, functions of parallelly monitoring and demodulating the multiple channels of broadcast signals can be implemented, the system and the method are applicable to diversified broadcast signals [AM (amplitude modulation), DSB (double-side-band), SSB (single-side-band), FM (frequency modulation) and FM stereophonic broadcast signals] and are high in flexibility, and the efficiency of the broadcast receivers can be improved.
Owner:SOUTHEAST UNIV

Causal knowledge-based power information network attack scene reconstruction method and system

PendingCN111541661AImprove the ability of correlation analysisAvoid information lossResourcesTransmissionReconstruction methodData mining
The invention discloses a causal knowledge-based power information network attack scene reconstruction method and system. The method comprises the steps: receiving alarm information uploaded by security equipment in a network; formatting the alarm information, and removing incomplete alarm information; extracting alarm events from the alarm information, arranging the alarm events into an alarm sequence according to a time sequence, performing correctness check on an alarm period value obtained according to the alarm sequence, and filtering false alarm information; clustering the alarm events in the alarm sequence according to the correlation between the alarm event addresses, and dividing an attack scene sequence; mining a statistical association relationship among the alarm event types ofthe safety equipment in the attack scene sequence to form causal knowledge; and judging an attack scene of the alarm sequence by utilizing a preset algorithm. By implementing the method and the device, the association analysis capability of massive alarm events is improved, information loss in alarm information preprocessing is avoided, and convenient conditions are provided for subsequent causalknowledge construction in an actual environment.
Owner:GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +3

Broadcasting of two generation cellular system control channel information over a three generation control channel to support roaming and handover to two generation cellular networks

InactiveCN1339231APrevent loss of informationImprove surge timeAssess restrictionRadio/inductive link selection arrangementsCellular networkHandover
A method, node and wireless communication terminal for providing handover and roaming from a 3G communication system to a 2G communication system. A dual-mode wireless terminal operating in a 3G communication system may obtain control channel information regarding a 2G communication system, and switch service as a function of the control channel information received. The method includes the step of providing control channel information for the 2G communication system over a downlink control channel of the 3G communication system to the wireless terminal. The node includes a means to communicate with the wireless communication terminal and a means providing control channel information of a second generation (2G) communication network over a downlink control channel at the 3G communication network. The wireless communication terminal includes a transceiver capable of communicating with a node of both a third generation (3G) wireless communication network and a second generation (2G) wireless communication metwork, and a control means coupled to the receiver for receiving and identifying control channel information indicative of the 2G communication network from a downlink control channel at the 3G communication network.
Owner:TELEFON AB LM ERICSSON (PUBL)

Recommendation algorithm performance optimization method based on knowledge graph

The invention relates to a recommendation algorithm performance optimization method based on a knowledge graph and particularly relates to a method for solving interpretability of a recommendation system, relieving cold start and improving algorithm accuracy. Firstly, an interpretability problem of the algorithm being solved, preprocessing an original data set, constructing a knowledge graph, obtaining the path information by using a knowledge graph meta-path extraction technology, inputting the path information into a recurrent neural network GRU, adding an attention mechanism and an averagepooling layer, and carrying out importance distinguishing on different paths to obtain a model prediction vector; secondly, relieving a cold start problem of the algorithm: multiplying the node attribute information of the user and the article to obtain an attribute fusion vector; and combining the vector results of the two parts according to a ratio of 3: 7, and training the model by using a cross entropy loss function to obtain a prediction result. The method is advantaged in that experiments show that compared with a recommendation algorithm based on a GRU model, accuracy of the algorithm is improved by 2.3%, and compared with a traditional matrix decomposition model, accuracy is improved by 5.1%.
Owner:BEIJING UNIV OF TECH

Method for radio communication in a wireless local area network and transceiving device

Method for radio communication in a wireless local area network and transceiving device refers to wireless local area networks (WLAN) consisting of a multitude of transceiving devices of users (14, 15, 16 . . . N). Implies simultaneous scanning by their antenna beams in different directions by transceiving devices (with said transceiving devices being in reception mode) and transmission of an omnidirectional signal in the form of calibration signal and data package by one of the transceiving devices of said network (with said transceiving device being in transmission mode), reception of the signal by transceiving devices operating in reception mode and subsequent orientation of their antenna beams in the direction of signal source. Said recognition and orientation is performed during the period of reception of said calibration signal. The Method increases the range of a WLAN, reduces the transmission time and improves quality and reliability of communication. Each transceiving device (1) includes at least one directional antenna (3) featuring a controllable directional pattern, switched-over by unit (4), reception/transmission mode switch (5), receiver (8), transmitter (10) and controller (11). Additionally a unit for signal detection (13) is incorporated in the device.
Owner:AIRGAIN INC
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