141results about How to "Improve discovery rate" patented technology

The invention provides a method for fake-license-plate analysis. The method comprises the steps that (1) information of all shooting checkpoints and information of the shooting time of license plates, to be analyzed, in a monitoring system are obtained; (2) the checkpoints are sequenced according to the sequence of the shooting time of the license plates; (3) whether information of a checkpoint adjacent to any checkpoint of the sequenced checkpoints is consistent with prestored checkpoint communicating information or not is judged, if yes, the license plates are real, and if not, the step (4) is executed, wherein the checkpoint communicating information is used for recording adjacency relation of the checkpoints; (4) all reachable paths from any inconsistent checkpoint to a checkpoint adjacent to the inconsistent checkpoint are determined according to the prestored checkpoint communicating information, whether a path meeting the requirement that the number of the checkpoints on the path is smaller than or equal to a preset value N exists in the reachable paths or not is judged, if yes, the license plates are real, and if not, fake license plates exist in the license plates. The method for fake-license-plate analysis overcomes the defect caused by fake-license-plate analysis through time track collisions.

The invention discloses a network security monitoring method based on bypass monitoring and software packet capturing technology. The method comprises the steps of (1) setting bypass monitor to an exchange at the same network section with a network security protection server; (2) configuring a source server IP of which the network packet is to be monitored and a data sending port; (3) setting the length of packet capturing time and packet capturing interval; (4) capturing and caching a network data packet, analyzing, and acquiring a source IP list in the data packet through a regular expression; (5) recording the source IP address to form a known IP address library; (6) finding out a new terminal accessed to the network through a network sniffing tool; (7) comparing the source IP list with all PC server lists in the LAN, and determining whether the corresponding security protection software is installed to a client PC terminal. With the adoption of the method, the rate and speed of finding the PC terminal without being provided with the security protection software are improved, and attack from the potential virus and Trojan caused by accessing the PC terminal without being equipped with the security protection software into the network can be reduced.

The invention provides a two-dimensional frequency-phase scanning small target detection system, aiming to provide a target detection system which is high in discovery rate, optimal in low-attitude detection performance, and high in anti-interference capability. The antennas of a horizontal sub-array and a vertical sub-array are connected with their respective microwave networks through their respective T/R components, the microwave networks are connected with receivers via n channels, the control information is sent to the T/R components via wave controllers through a time sequence and timing generator, frequency synthesizers are controlled by the time sequence and timing generator to generate excitation signals, the excitation signals are sent to the microwave networks via pre-amplifiers, the microwave networks radiate the beam through the T components to the antennas to the specified detection airspace and control the R components in the arrays to receive the radar echoes specified by emission, the radar echoes are sent to the receivers to signal processors for target detection after being amplified by each column of R components, the target detection data of the horizontal sub-array and the vertical sub-array are integrated, so that the high angle detection accuracy of orientation and pitching is achieved.

The invention discloses a direction-of-arrival estimation method based on sparse representation. The method mainly solves the problems that because a similar technology is large in calculation amount and low in angular resolution, the estimation speed of target reconnaissance and passive location is low and estimation errors in target reconnaissance and passive location are large. The method comprises the implementation steps: (1) acquiring output signals of an array and calculating a covariance matrix R of the signals, (2) constructing reconstructed sparse vectors through lower triangular elements of the covariance matrix R, (3) carrying out mesh generation on a spatial domain to construct a perfect base, (4) converting the direction-of-arrival estimation issue into the issue of solving a constrained optimization equation according to the sparse representation relation between the reconstructed sparse vectors and the perfect base, (5) solving the constrained optimization equation according to the convex optimization method to obtain the optimal estimation vectors, (6) drawing a magnitude spectrum according to the one-to-one correspondence of the optimal estimation vectors and spatial domain angles to obtain the direction-of-arrival value. By means of the method, the calculation speed of target reconnaissance and passive location is decreased, and the estimation errors in target reconnaissance and passive location are reduced. The method can be applied to target reconnaissance and passive location.

The invention discloses a kit for colorectal cancer detection and an application thereof. The kit comprises a primer composition, and a probe composition. The primer composition comprises BS-S9-F, BS-S9-R, BS-N4-F, BS-N4-R, BS-SDC2-F, BS-SDC2-R, BS-ACT-F and BS-ACT-R. The probe composition comprises BS-S9-P, BS-N4-P, BS-SDC2-P and BS-ACT-P. The kit of the invention can be applied to the detectionof colorectal cancer, and has the advantages of high sensitivity and high specificity.

This invention provides a system and a method for monitoring air targets based on public mobile communication network, which sets up or reforms a communication base station as the air transmission base station and distributes a certain numbers of passive receiving stations around it. The passive receive stations receive the echoes of the air transmission base station radiation signals reflected by the air target and measure the delay time, arriving angle, frequency and phase variance of the echo then to transfer the data to a data process center via network, which processes the data in terms of multi-curve surface intersection method to get data of location, speed, course of the air target and send them to users.

The invention relates to a method for realizing wireless personal area network routing protocols based on ultra-wide band positioning assist, comprising the following steps of: firstly acquiring the coordinate of each node in a network by utilizing an ultra-wide band positioning technique, then carrying out flooding routing discovery with a limited range by using the nodes based on positioning information, updating routing request areas by utilizing the middle node receiving a routing querying message according to the recording position information of the node, and then selecting fan-shaped areas with dynamically regulated ranges in the routing request areas. The simulated and analyzed results show that compared with LAR (Location-Aided Routing) protocols, after carrying out node positioning with low node energy consumption and calculation and updating on the routing request areas, the invention reduces the overheads of routing control messages, shortens the end-to-end average time delay of data messages, and obviously improves effects.

The invention discloses an atrial fibrillation detector comprising the following elements: an acquisition module used for collecting a pulse signal sequence and recording pulse time intervals; a grouping module used for ranking the recorded pulse time intervals from small to big, and dividing into groups of a preset number; a calculation module used for calculating a pulse time interval deviation value; a comparison module used for comparing repeatedly collected and calculated pulse time interval deviation value of the preset number with a preset threshold value, determining whether the calculated deviation value is bigger than or equal to the preset threshold value, thus determining whether atrial fibrillation exists or not. The atrial fibrillation detector and an intelligent wearable device having same can improve atrial fibrillation discovery rate, so people can self-operate under non-medical conditions, thus carrying out atrial fibrillation detection.

The invention discloses an Android application-oriented intelligent fuzzy test method. The method comprises application reverse symbol execution and Android application fuzzy testing. Android vulnerability characteristics are used for performing modeling analysis on an Android application to obtain an Android application entry function, a sensitive operation point, control flow and function call information; the reverse symbol execution is performed by taking the sensitive operation point as an entry to obtain path constraint information; the path constraint information is subjected to constraint solving to obtain a path test case triggering a vulnerability; the generated path test case is used for performing fuzzy testing on the Android application to monitor a program running state; andthe program running information is analyzed to generate a related vulnerability report. The test case triggering the vulnerability can be generated, so that the path explosion is avoided and the fuzzytesting under the guidance of the method is more targeted. Compared with a conventional fuzzy testing method, the method solves the problem of fuzzy testing blindness and improves the fuzzy testing efficiency.

The invention, which relates to the technical field of the electronic product, provides an electromagnetic-leakage-based method and device for detecting a stealing-shooting device, comprising: firstly, obtaining a target electromagnetic fingerprint model; acquiring a target electromagnetic fingerprint at any position in the to-be-detected area by using a detection probe; calculating gain values ofthe collected target electromagnetic fingerprint and each electromagnetic fingerprint in the target electromagnetic fingerprint model to obtain at least one gain value; and finally determining whether the device corresponding to the target electromagnetic fingerprint is a stealing device based on the at least one gain value. The target electromagnetic fingerprint model can avoid the interferenceof the external environment, and improves the detection accuracy. Automatic collection of electromagnetic fingerprints can be achieved through the detection probe. Due to the fact that electromagneticleakage protection is difficult to achieve in the use scene of the stealing and shooting equipment, the discovery rate of the stealing and shooting equipment can be increased.

The invention discloses a target extraction method based on a ground surveillance radar system. The method comprises the following steps of: obtaining target echo information processed by the front end of a radar; performing a false plot filtering process on the target echo information; performing a fuzzification process on the target echo information after the false plot filtering process; forming a two-dimensional image on the target echo information after the fuzzification process, and performing target edge extraction on the two-dimensional image; performing ground object target filteringprocess on the obtained target echo information which belongs to the same target after the edge extraction; and obtaining the target echo information which belongs to the same target after the groundobject target filtering process. According to the target extraction method based on the ground surveillance radar system, the target extraction integrity is improved, the target extraction precision is improved, and the risk that the same target is split into multiple targets when performing target extraction is reduced.

The present disclosure provides a method and apparatus of discovering a bad case based on artificial intelligence, a device and a storage medium, wherein the method comprises: performing named entity recognition for a to-be-recognized query, and respectively obtaining a confidence level of each character in the query; respectively obtaining a probability value of each character of forming a word with a neighboring character in the query; determining whether there is a bad case according to the confidence level and the probability value. The solution of the present disclosure may be applied to save man power costs, and improve the processing efficiency and enhance a discovery rate of bad cases.

The invention discloses a target clustering method based on a ground surveillance radar system. The method comprises the following steps of acquiring target echo information after radar front-end processing; carrying out false plot filter processing on the target echo information in order to obtain filtered target echo information; carrying out speed clustering on the filtered target echo information in order to obtain target echo information after speed clustering on a distance library; carrying out distance clustering on the target echo information after speed clustering on the distance library in order to obtain target parameters and target echo information after distance clustering at the azimuth; and carrying out azimuth clustering on the target echo information after distance clustering at the azimuth in order to obtain target parameters and target echo information which belong to the same target after azimuth clustering. According to the method, the risk that the targets at different speeds are merged into the same target is reduced, the precision of target clustering is improved, and a reliable foundation is provided for follow-up track processing.

The invention provides an air target quick capturing method of monopulse radar. By means of the method, a target searching and capturing capability of the radar can be remarkably improved on conditions of low signal-to-noise ratio and high-speed target movement, thereby realizing quick target capturing. The air target quick capturing method is realized through a technical solution which is characterized in that DSP embedded software is composed of a three-channel constant false-alarm rate detecting module, a wave beam direction adjusting module, a target parameter estimating module, a sequence position correlation module and a slide window accumulation confirmation module, wherein the method comprises the steps of inputting summation, direction difference and pitch difference three-channel distance images, performing constant false-alarm rate determination on the three-channel distance images, thereby obtaining a target signal with a highest amplitude; then changing elapse main triggering time, and adjusting the wave beam according to a designed strategy; performing target parameter estimation by means of a phase and a difference type monopulse measured angle; determining a fact that target correlation successes or fails by means of sequence position correlation; performing sliding window type accumulation on the correlation result, determining the accumulation result, and outputting the target information which is successively captured through the monopulse radar.

The invention discloses a two-stage threshold constant false alarm detection algorithm under strong ground clutters. Radar receiving echoes are subjected to down-conversion, decimation filtering, pulse compression and phase-coherent accumulation to form distance-Doppler two-dimensional data; and a two-stage threshold deletion average CFAR detection algorithm is adopted to determine the position ofthe target in the two-dimensional data, namely distance and Doppler information. Aiming at the problems of the ground reconnaissance radar CFAR detection technology, a two-stage threshold deletion average CFAR detection algorithm is designed, the discovery probability is improved, the false alarm probability is reduced, the calculation time is shortened, and the real-time requirement of a radar system is met.

The invention discloses a fuzz testing-based industrial control system vulnerability mining method and apparatus, and a vulnerability restoration method, and relates to the technical field of vulnerability detection. The vulnerability mining method comprises the steps of firstly connecting a detection apparatus to an industrial control system; obtaining data of the industrial control system by thedetection apparatus after the detection apparatus is connected to the industrial control system; generating a standard state form and standard running data by the detection apparatus; storing the standard state form and the standard running data after the standard state form and the standard running data are generated; and starting vulnerability detection by the detection apparatus wherein the vulnerability detection is performed through fuzz testing. By adopting the technical scheme, during delivery, the vulnerability detection is firstly performed, and original passive vulnerability detection and restoration become active vulnerability detection, so that the error probability of the industrial control system after delivery is reduced and the user experience is improved; and the fuzz testing is performed through the state form and the running data, so that the vulnerability discovery probability is higher and the accuracy is higher.

The invention discloses a path protection method for optimizing node sleep in a green network under delay and shared risk link group restraint. By using the method, in path calculation, the influence of sleep or awakening delay on a node due to path delay before a sleep node is taken into consideration and the path end-to-end delay calculating precision is improved. A cost function used when the obtained path is selected not only ensures that the reliability of a combined path meets restraint, but also encourages link and sleep node resource share between the protecting paths through calculation of path occupied network link and node resources, therefore, the proportion of the sleep node in the network is increased and the awakening frequency on the sleep node is reduced. The complexity of the method approaches that of the traditional k shortest path calculation-based path protection method; and the invention has strong adaptability on the change of the data flow of the network and expresses excellent and stable performance.

The invention provides a system and method for monitoring a low-slow-small unmanned aerial vehicle. The system comprises a detection device used for collecting target information and vacant unmanned aerial vehicle fixedly arranged in the air, wherein the detection device and the vacant unmanned aerial vehicle are sequentially distributed in a set range, and a photoelectric device and a command control platform arranged on the ground are arranged on the vacant unmanned aerial vehicle; a probe device comprises a laser range finder, a radar and a photoelectric device; the detection device and thevacant unmanned aerial vehicle transmit data to the command control platform through a wireless network. According to the system, the radar, the laser range finder, the photoelectric device and the vacant unmanned aerial vehicle are combined, the vacant unmanned aerial vehicle can be automatically found and identified, and the system is compatible with various monitoring means; the data is sent to the command control platform through the wireless network for data analysis, processing and storage, the defects that a single discovery mode is low in finding rate and missed alarm situations are likely to occur are overcome, the finding rate is increased, the missed alarm situations are reduced, and the working efficiency is improved.

The invention discloses a ship safety monitoring system and a using method thereof, and belongs to the field of ship safety. The ship safety monitoring system enables two ships in the same navigationchannel as a distress ship to receive a distress signal at the first time to prepare for rescue through first two rescue barriers. Meanwhile, a nearest ship (a ship not on the same navigation channel)on also receive the distress signal to carry out a rescue operation. The multi-direction rescue greatly improves the probability of being successfully rescued. Meanwhile, compared with a conventionalmode of starting rescue from the land, the rescue of nearest ships greatly reduces the time to reach a rescue site and increases the probability of crew and ship passengers rescued successfully. Meanwhile, through a third rescue barrier, whether in sunny days, night or rainy weather, the probability of the crew and passengers who escape from the abandoned ship being found by search and rescue ships can be improved and the time for successful rescue can be increased.

The invention discloses a marine ecological anomaly risk identification method based on multi-source heterogeneous data. The method comprises the steps that a multi-source heterogeneous data file of atarget sea area is acquired; generating a quality control report according to the multi-source heterogeneous data file; establishing a marine information database according to the multi-source heterogeneous data meeting the data quality standard; the method comprises the steps of establishing an ocean numerical model on a cloud platform, and updating an ocean information database to obtain an updated ocean information database; obtaining a first-level marine ecological anomaly index data product according to the updated marine information database; performing weighted average on each marine ecological anomaly index data product to obtain a secondary marine ecological anomaly index data product of the target sea area; and carrying out threshold detection on the secondary marine ecology abnormal index data product, and if an abnormal index greater than a first preset threshold exists, sending early warning information. According to the marine ecological anomaly risk identification method based on the multi-source heterogeneous data, the accuracy of marine ecological anomaly risk identification can be effectively improved.

The invention discloses a target extraction and aggregation method based on a ground surveillance radar system. The method comprises a step of performing false dot filtering processing on target echoinformation, a step of blurring the filtered target echo information to form a two-dimensional image, a step of performing target edge extraction on the two-dimensional image, a step of performing ground object target filtering processing after the target edge extraction, a step of sequentially carrying out velocity aggregation and distance aggregation on target echo information belonging to the same target after the ground object target filtering processing, and a step of performing azimuth aggregation on the target echo information which is subjected to distance aggregation to obtain targetecho information and target parameters belonging to the same target after the azimuth aggregation. According to the invention, the risk that the same target is split into multiple targets when the target extraction is performed is reduced, the risk that targets of different speeds are merged into the same target when the targets are aggregated is reduced, the integrity and accuracy of the target extraction and the accuracy of the target aggregation are improved, and a reliable basis is provided for subsequent track processing.

The invention relates to an OFDM-based radar communication integrated signal sidelobe suppression method, which comprises the following steps of: designing a reference signal of which the length is greater than the original length for a received OFDM radar communication integrated signal, and designing a mismatched filter adaptive to the reference signal; and by performing expansion and merging calculation on coefficients of a Helvetz polynomial of an OFDM radar communication integrated signal generated after convolution of the Helvetz polynomial and the Helvetz polynomial, suppressing side lobes and pseudo peaks of the received OFDM radar communication integrated signal, and enabling the algorithm in the invention to allow the OFDM integrated shared signal to have both high-speed communication and high-performance radar detection performance.