Abstract: A lightweight intrusion detection method includes obtaining a feature data set of the internet of vehicles and pre-processing data; dividing pre-processed data into an initial training set, an initial verification set and an initial test set according to a preset proportion, performing data balance on the initial training set to obtain a balanced training set, performing feature selection on the balanced training set, the initial verification set and the test set; obtaining a teacher model by training with the model training set and the model verification set; using the teacher model, the model training set and the model verification set for distillation training to obtain a student model; testing a size and complexity of the student model and the performance of the student model, and saving the student model that passes the test as a lightweight intrusion detection model; and deploying the lightweight intrusion detection model.

Abstract: A network threat intelligence relational triple combined extraction method based on deep learning includes: (a) an entity and a relation are both extracted by using a combined extraction method, which solves the problem of a lack of interaction between entity and relation extraction tasks; (b) a problem of entity overlapping is solved by using a method based on a span; (c) a BERT large-scale pre-training model is used for vector representation of a text; and because the pre-training model includes contextual information learned from a large-scale corpus, semantic expression on a threat intelligence text by the model can be extremely enriched; and (d) various modal information, for example, time sequences, dependency relations, the spans, labels, and the like, is fused to enhance the interaction between multimodal information.

Abstract: A method includes: calculating a first difference between a current actual attitude of a fuselage and a desired attitude and a second difference between an actual depth and a desired depth; inputting the first difference and the second difference into a set terminal sliding mode surface to obtain an output value of the terminal sliding mode surface; using the output value as an input of a preset high-order observer, a radial basis function neural network and a terminal sliding mode control law, respectively, and using an output of the high-order observer and an output of the radial basis function neural network as a compensation input of the terminal sliding mode control law; performing power distribution for each propeller of a propeller assembly on the basis of the virtual force to obtain a propelling force of each propeller; and controlling the propellers of the underwater submersible robot.

Abstract: Present disclosure provides a test method and system for a seismic isolation structure, the method comprising: loading driving displacement time history signal into a substructure of the structure, recording restoring force time history feedback signal of the substructure; applying restoring force time history feedback signal to numerical substructure of seismic isolation structure, solving dynamic response of numerical substructure, recording structural displacement response time of the numerical substructure; calculating root-mean-square error (RMSE) of driving displacement time history signal and structural displacement response time signal; judging whether the RMSE is less than a threshold; if the RMSE is less than the threshold, ending the experiment; if the RMSE is not less than the threshold: correcting the time history signals according to a model identification algorithm, obtaining a corrected driving displacement time history signal of the next iteration, loading the corrected driving displacement t

Abstract: Use of extracellular vesicles of Rhizoma Drynariae in the preparation of a medicine for treating orthopedic diseases. The extracellular vesicles are extracted from the traditional Chinese medicine Rhizoma Drynariae, so that proliferation and differentiation of the bone marrow mesenchymal stem cells can be promoted, and the bone targeting property is achieved; in addition, various functional components which are the same as those of Rhizoma Drynariae are contained, so that the potential of treating orthopedic diseases is proved. Therefore, the extracellular vesicles of Rhizoma Drynariae can be applied to the preparation of a medicine for treating orthopedic diseases.

Abstract: A three-dimensional isolator for vibration-seismic dual control. The three-dimensional isolator comprises an isolator body and isolator components, wherein the isolator body comprises a plurality of middle-layer connecting plates and a plurality of rubber module units, the middle-layer connecting plates are vertically arranged at intervals, and the rubber module units are arranged on the upper surfaces and the lower surfaces of the middle-layer connecting plates in parallel and connect the middle-layer connecting plates into a whole; and the isolator components comprise cover plate components and pre-tightening pieces, the cover plate components comprise an upper cover plate, a lower cover plate and side walls which define an isolator cavity, a flange plate is arranged on the top of the side wall, a gap is reserved between the upper cover plate and the flange plate.

Abstract: A bag breaking device for garbage bags, which includes a horizontal moving mechanism, a vertical moving mechanism mounted on the horizontal moving mechanism, and a bag breaking mechanism mounted on the vertical moving mechanism; the bag breaking mechanism includes a first motor on the vertical moving mechanism, a first housing fixedly connected to an output end of the first motor, a second housing fixed on the first housing, a second motor fixed in the first housing, a first screw rod fixedly connected to an output end of the second motor, a screw block scraper rotatably mounted on the first screw rod, and a cylindrical knife fixed on the second housing.

Abstract: An iterative learning-based energy-saving control method for a piezoelectric motor, comprising: setting a sampling period of a piezoelectric motor (101); obtaining an expected output trajectory of the piezoelectric motor, and performing sampling according to the sampling period to obtain a sampled expected output sequence (102); setting an initial control input signal of the piezoelectric motor (103); obtaining an actual control input signal according to a mapping relation of the initial control input signal, and transmitting the actual control input signal to the piezoelectric motor to obtain an actual output position (104); obtaining a mapping relation of the output position of the piezoelectric motor according to the actual output position, and sampling the mapping relation according to the sampling period to obtain a sampled actual output sequence (105); calculating the difference between the sampled expected output sequence and the sampled actual output sequence to obtain a sampling error function sequen

Abstract: The present disclosure relates to the technical field of Internet, in particular to a method for measuring network international outlet interfaces of a designated area. The method includes the following steps: acquiring a designated collection of routing interface paths and area location information of IP addresses of routing interface nodes; dividing the collected routing interface paths into critical hop complete paths and critical hop missing paths; determining whether a routing interface path is a critical hop complete path; using a 2-tuple to identify network international outlet interfaces of the routing interface path; and counting the quantity of the network international outlet interfaces of the measured area.

Abstract: The present disclosure relates to the technical field of photocatalysis/electrocatalysis, and in particular to a non-metallic high-entropy compound, and a preparation method and use thereof. In the present disclosure, the non-metallic high-entropy compound includes at least five non-metallic elements, where each of the at least five non-metallic elements has a molar proportion of 0.1% to 99.0%, and a total atomic proportion of the at least five non-metallic elements are 100%. The non-metallic high-entropy compound has a controllable band gap, an adjustable conductivity, and a desirable surface activity, and shows a catalytic reaction activity for hydrogen production by high-efficiency photocatalytic/electrocatalytic water splitting, carbon dioxide reduction, or organic pollutant degradation. Moreover, synthetic raw materials are all non-metals, which are cheap and easily available, while a synthesis process is simple and easy to implement.

Abstract: An Android penetration method and device for implementing silent installation based on accessibility services. The method includes: acquiring a second target application by adding a load program to a first target application and adding penetration permissions using an Android decompilation technology; and implementing silent installation of the second target application using an accessibility service technology.

Abstract: The present application relates to a network-on-chip data processing method. The method is applied to a network-on-chip processing system, the network-on-chip processing system is used for executing machine learning calculation, and the network-on-chip processing system comprises a storage device and a calculation device. The method comprises: accessing the storage device in the network-on-chip processing system by means of a first calculation device in the network-on-chip processing system, and obtaining first operation data; performing an operation on the first operation data by means of the first calculation device to obtain a first operation result; and sending the first operation result to a second calculation device in the network-on-chip processing system. According to the method, operation overhead can be reduced and data read/write efficiency can be improved.

Abstract: Disclosed in the invention is a virtual reproduction method for a multichannel spatial surround sound in three-dimensional space. Multichannel spatial surround sound signals are undergone a sum and difference operation and processed with virtual reproduction signal processing functions, then fed to four actual loudspeakers arranged at left-front-up and right-front-up directions on a high elevation plane of 30°±10° and horizontal left-front and right-front directions for reproduction, and generate a auditory effect of spatial surround sound. The invention simplifies the number and arrangement of loudspeakers required for multichannel spatial surround sound reproduction, and is suitable for cases in which the arrangement of multiple loudspeakers for spatial surround sound is infeasible, such as in a TV set, and so on.

Abstract: Disclosed is a system for classifying encrypted traffic based on a data packet. The system includes a traffic capture module, a traffic analysis module, and a traffic classification module. The system collects data packets from a network flow to construct a machine learning model, so as to classify encrypted traffic and identify normal traffic and malicious traffic. In a process of constructing a feature matrix, basic spatial-temporal features, header features, load features, and statistical features are obtained. In addition, behavioral features of the data packets are obtained and used to demonstrate differences between the normal traffic and the malicious traffic. Moreover, the present disclosure focuses on a difference between different versions of an encryption protocol, especially a transport layer security (TLS) protocol, and introduces the difference into a model for analysis, so that the system classifies encrypted traffic in a more efficient manner.

Abstract: A value chain knowledge discovery method under personalized customization is provided. The method comprises the following steps: defining a value topic for a given domain text, and extracting a value anchoring seed word; constructing a value semantic topological space according to the value anchoring seed word; expanding the value anchoring seed word to obtain an initial topic anchoring word set; updating the initial topic anchoring word to obtain an optimized topic anchoring word set; obtaining a multi-cluster net structure representation of a value semantic text by taking the optimized topic anchoring word as a constraint; and anchoring and constraining a plurality of cross-domain texts to construct a value chain knowledge graph.

Abstract: The present invention provides a hybrid-power-driven underwater robot, including a robot body and a releasing and recovering device, wherein a first transmission cavity is formed in the releasing and recovering device, a seawater removing mechanism and an electric take-up reel are arranged inside the first transmission cavity, a cable is arranged on the electric take-up reel, the cable extends out of the first transmission cavity, and the robot body is fixedly connected to one end of the cable; and a tail fin is movably connected to the robot body, an acceleration mechanism is further arranged on the robot body, a second transmission cavity is formed in the robot body, a driving mechanism for driving the tail fin and the acceleration mechanism is arranged inside the second transmission cavity, and the driving mechanism can drive the tail fin separately or drive the acceleration mechanism separately.

Abstract: A revocable lightweight group authentication method and system for an edge controller is described here. When the edge controller needs to be registered, an edge server generates a private key of the edge controller and sends the private key to the edge controller, and meanwhile adds the edge controller to a group list of the edge server; the edge server updates a certificate of the edge controller, adds the certificate to a certificate list of the edge server and sends the certificate to the edge controller so that the edge controller updates the private key according to the updated certificate; and then the edge controller generates a signature according to the updated private key, and sends the signature to the edge server so that the edge server authenticates the edge controller after determining that the signature meets preset requirements.

Abstract: Disclosed are apparatus, method and system for monitoring mold based on weak electrical signals. The apparatus comprises a mold collector, a power supply, a trans-impedance amplifier, and an analog-to-digital converter, wherein the mold collector is smeared with a trophoplasm, and a substrate of the mold collector has electrical conductivity, the power supply is used for applying a voltage to the substrate of the mold collector, the trans-impedance amplifier is used for amplifying a weak current generated from the substrate of the mold collector to a voltage signal, and the analog-to-digital converter is used for converting the voltage signal amplified by the trans-impedance amplifier into a digital signal for determining the quantity of molds.

Abstract: A flow focusing type one-step double emulsion droplet parallel generation device and method. The device comprises a fluid injection module, a liquid droplet generation module, a liquid droplet surface solidification module and a liquid droplet collection module, wherein the fluid injection module is used for conveying fluid of each phase to the liquid droplet generation module; and the liquid droplet generation module comprises a fluid distribution functional area, a liquid droplet preparation functional area and an auxiliary functional arca, wherein the liquid droplet distribution functional area is used for conveying the fluid of each phase into a channel of the fluid of each phase corresponding to the liquid droplet preparation functional area, and the fluid of each phase is gathered at the same point in a flow focusing structure and then is broken, and a fluid of an outer phase covers the fluid of the middle phase.

Abstract: The present invention discloses a modular underwater robot and a control method therefor. The modular underwater robot includes support plates, a first chamber, a second chamber, and a power assembly, where the supporting plates are stacked, and front end edges and rear end edges of the support plates are respectively provided with a first hollow portion and a second hollow portion; the first chamber is disposed in the first hollow portion; the second chamber is disposed in the second hollow portion, and the second chamber and the first chamber are in a same horizontal position; and the power assembly includes fixed vector thrusters and vertical thrusters. As such, the fixed vector thrusters can enable the modular underwater robot to move forward, backward, or rotatably, so that flexibility of the modular underwater robot can be improved.