Abstract: A dual-joint multi-degree-of-freedom mechanical arm and a driving method thereof. The mechanical arm comprises a base, a driving mechanism, a large arm module and a small arm module. The driving mechanism comprises three bidirectional driving components mounted on the base; and the big arm module comprises a big arm push rod, a big arm central rod and an elbow joint universal plate. The comprises a wrist joint universal plate, a universal joint coupler, a small arm central rod, a small arm stretching rod and a wrist joint universal plate. The small arm stretching rod comprises a first connecting rod and a second connecting rod in transmission connection. Two-degree-of-freedom rotation of the big arm module and the small arm module connected in series is independently realized by using three bidirectional driving components fixed on the base, so that movement flexibility of an end executor in a working space is greatly improved.

Abstract: The present application relates to an occluded pedestrian re-identification method, including steps of obtaining global features and local features of occluded pedestrians, and recombining the local features into a local feature map; obtaining a heat map of key-points of pedestrian images and a group of key-point confidences, obtaining a group of features of the pedestrian key-points by using the local feature map and the heat map; obtaining a local feature group by using the global features to enhance each key-point feature in the group of features of pedestrian key-points according to Conv, and an adjacency matrix of key-points is obtained through the key-points, the local feature group and the adjacency matrix of key-points are used as the input of GCN to obtain the final features of pedestrian key-points.

Abstract: The present disclosure provides a full-cycle health detection system for a dairy cow based on visual recognition, including: electronic chips provided with dairy cow identifiers (IDs), and fixed on dairy cows; an online acquisition device configured to acquire an image of a to-be-detected dairy cow online and recognize a dairy cow ID, and transmit an acquired image of the to-be-detected dairy cow and the dairy cow ID to a master control module; the master control module provided with an image recognition algorithm and a health determination algorithm; and the storage module configured to store full-cycle growth information of dairy cows corresponding to all of the dairy cow IDs and standard full-cycle growth information of the dairy cows. The present disclosure can use visual recognition instead of the manual measurement, and can determine growth and health states of the dairy cow quickly and accurately.

Abstract: The present disclosure provides a cherry picking and classifying method based on machine vision, including: acquiring an image for a cherry with a stem hung on a branch, filtering the image to remove noise, and taking a resulting image as an original image; processing the original image to extract a stem feature of the cherry, and determining a picking point for picking; acquiring an image for a picked cherry to obtain a classification image; processing the classification image to extract a contour feature of the cherry, and calculating a size of the cherry according to the contour feature; and classifying the cherry according to size data of the cherry. The present disclosure further provides a picking and classifying device, including: an acquisition module, a classifying transmission module, a connection module; and a control module.

Abstract: The present disclosure provides a tooth disease classification method based on federated learning (FL), including the following steps: S1: acquiring oral information of a user; S2: transmitting an oral dental image to a local server for preprocessing; S3: performing, by the single local server, model training according to a preprocessed oral dental image set and a model of a cloud master server; S4: transmitting trained model parameters to the cloud master server through digital encryption; and S5: performing, by each of local servers, fusion and classification according to digitally decrypted model parameters from the cloud master server. The method provided by the present disclosure has accurate classification, does not need to centrally process data, and keeps the oral information strictly secret without privacy disclosure; and meanwhile, the method encrypts the model parameters to further ensure the security.

Abstract: Disclosed is a method for detection a malicious attack based on deep learning in a transportation cyber-physical system (TCPS), comprising: extracting original feature data of a malicious data flow and a normal data flow from a TCPS; cleaning and coding original feature data; selecting key features from the feature data; cleaning and coding the key features to establish a deep learning model; finally, inputing unknown behavior data to be identified into the deep learning model to identify whether the data is malicious data, thereby detecting a malicious attack. The present invention uses a deep learning method to extract and learn the behavior of a program in a TCPS, and detect the malicious attack according to the deep learning result, and effectively identify the malicious attack in the TCPS.

Abstract: An impedance matching method for a low-profile ultra-wideband array antenna is provided. The method includes: connecting an arm of a balanced end of a hyperbolic microstrip balun in series with an open circuit line; directly coupling the open circuit line to a radiator layer; connecting another arm of the balanced end of the hyperbolic microstrip balun to the radiator layer via a metallized via hole, and welding an unbalanced end of the hyperbolic microstrip balun to a coaxial line, so that the coaxial line feeds a power to the antenna via the hyperbolic microstrip balun. In this method, the open circuit line is integrated between the hyperbolic microstrip balun and the radiator layer of the antenna to achieve an impedance matching of the ultra-wideband antenna and to simplify a structure of a matching circuit.

Abstract: A microstrip ultra-wideband antenna is provided, including: an upper dielectric substrate, a radiation patch, an open-circuit line, a short-circuit line, a ground plane, a lower dielectric substrate, a vertical dielectric substrate, isolation walls, a hyperbolic microstrip balun feeder and an ideal wave port. The radiation patch is attached to a lower surface of the upper dielectric substrate; the ground plane is attached to an upper surface of the lower dielectric substrate; the short-circuit line and the open-circuit line are attached to a rear surface and a front surface of the vertical dielectric substrate respectively; the hyperbolic microstrip balun feeder is attached to the front and rear surface of the vertical dielectric substrate; the isolation walls are located between the upper dielectric substrate and the lower dielectric substrate perpendicularly to an end of the radiation patch; and the ideal wave port is provided below the hyperbolic microstrip balun feeder.

Abstract: A fully coupled magnetic device includes at least two phases of circuits, with each phase formed by several coupling units connected in series. Every two phases of circuits are directly coupled through at least one coupling unit, and a direction of a magnetic field generated by DC (direct current) of one phase of the two phases of circuits is opposite to that of another phase of the two phases of circuits.

Abstract: The present disclosure provides a multi-band base station antenna for scattering suppression, including a high-band dual-polarized antenna and a low-band dual-polarized antenna. The operating band of the high-band dual-polarized antenna is 1.7-3.0 GHz, which are four; the operating band of the low-band dual-polarized antenna operates is 0.69-0.96 GHz, and is comprised of two intersected dipoles; above the high-band dual-polarized antennas, a spacing between the high-band dual-polarized antenna and the low-band dual-polarized antenna is smaller than the quarter wavelength corresponding to the low-band dual-polarized antenna; the low-band dual-polarized antenna is provided with several rectangular open slots at equal spacings, with symmetrical openings on both sides of the dipole, with a width of 1-1.5 mm and a length of 4-to 6 mm; and a ratio of the sum of widths of the open slots to a length of an arm of the dipole is greater than 0.16 and less than 0.24.

Abstract: An enhancement-mode III-V HEMT based on an all-solid-state battery is provided. In which, a second semiconductor layer and a first semiconductor layer are sequentially formed on a substrate, and a heterostructure is formed between the second semiconductor layer and the first semiconductor layer; a source electrode is electrically connected to a drain electrode through a 2DEG generated in the heterostructure; a gate electrode is used to control on-off of the 2DEG in the heterostructure; and an all-solid-state battery is arranged between the source electrode and the gate electrode, is composed of at least one group of battery units connected in series or connected in series and parallel, and is used to deplete the 2DEG in a corresponding region of the heterostructure.

Abstract: A method for automatic extraction of data from a graph, including text area locating and text box classification; locating of coordinate axes, and locating of the positions of hatch marks on the coordinate axes; legend locating and information extraction; extracting corresponding bar or polyline connected components according to legend color, and filtering and classification; determining key points on the X-axis and locating a corresponding X-axis label for each key point; locating key points of the bars and polyline according to the X-axis key points, determining labeled numerical text boxes that correspond to the key points, and identifying the numerical text; calculating a corresponding value for each pixel, and estimating corresponding values of the key points of the bars or polyline; determining a final result according to a difference between the estimated values and the recognized labeled values.

Abstract: An impedance matching method for a low-profile ultra-wideband array antenna is provided. The method includes: connecting an arm of a balanced end of a hyperbolic microstrip balun in series with an open circuit line; directly coupling the open circuit line to a radiator layer; connecting another arm of the balanced end of the hyperbolic microstrip balun to the radiator layer via a metallized via hole, and welding an unbalanced end of the hyperbolic microstrip balun to a coaxial line, so that the coaxial line feeds a power to the antenna via the hyperbolic microstrip balun. In this method, the open circuit line is integrated between the hyperbolic microstrip balun and the radiator layer of the antenna to achieve an impedance matching of the ultra-wideband antenna and to simplify a structure of a matching circuit.

Abstract: The present disclosure provides a multi-band base station antenna for scattering suppression, including a high-band dual-polarized antenna and a low-band dual-polarized antenna. The operating band of the high-band dual-polarized antenna is 1.7-3.0 GHz, which are four; the operating band of the low-band dual-polarized antenna operates is 0.69-0.96 GHz, and is comprised of two intersected dipoles; above the high-band dual-polarized antennas, a spacing between the high-band dual-polarized antenna and the low-band dual-polarized antenna is smaller than the quarter wavelength corresponding to the low-band dual-polarized antenna; the low-band dual-polarized antenna is provided with several rectangular open slots at equal spacings, with symmetrical openings on both sides of the dipole, with a width of 1-1.5 mm and a length of 4-to 6 mm; and a ratio of the sum of widths of the open slots to a length of an arm of the dipole is greater than 0.16 and less than 0.24.

Abstract: A microstrip ultra-wideband antenna is provided, including: an upper dielectric substrate, a radiation patch, an open-circuit line, a short-circuit line, a ground plane, a lower dielectric substrate, a vertical dielectric substrate, isolation walls, a hyperbolic microstrip balun feeder and an ideal wave port. The radiation patch is attached to a lower surface of the upper dielectric substrate; the ground plane is attached to an upper surface of the lower dielectric substrate; the short-circuit line and the open-circuit line are attached to a rear surface and a front surface of the vertical dielectric substrate respectively; the hyperbolic microstrip balun feeder is attached to the front and rear surface of the vertical dielectric substrate; the isolation walls are located between the upper dielectric substrate and the lower dielectric substrate perpendicularly to an end of the radiation patch; and the ideal wave port is provided below the hyperbolic microstrip balun feeder.

Abstract: The present disclosure discloses a hybrid five-level bidirectional DC/DC converter and a voltage match modulation method thereof. The converter includes a first input filter capacitor Cinp and a second input filter capacitor Cinn, an output filter capacitor Co, a DC voltage source, a primary-side hybrid five-level unit, a primary-side two-level half bridge, a secondary-side single-phase full bridge H2, a high-frequency isolation transformer M1, a high-frequency inductor Ls, and a controller. A positive pole of a DC bus of the primary-side hybrid five-level unit is coupled to a positive pole of the corresponding DC voltage source and to a positive pole of the input filter capacitor Cinp respectively. A negative pole of the DC bus of the primary-side hybrid five-level unit is coupled to a negative pole of the corresponding DC voltage source and to a negative pole of the input filter capacitor Cinn respectively.

Abstract: The present invention discloses a preparation method of an alkaline anion exchange membrane and a use of the membrane in a fuel cell. The preparation method of the alkaline anion exchange membrane contains: taking polyvinyl alcohol as a substrate, which provides mechanical strength for the membrane; taking a commercialized alkaline resin as an anion exchange resin of chemically reactive groups, performing a cross-linking reaction between polyvinyl alcohol and the alkaline resin by mixing; meanwhile, during the process of forming the alkaline anion exchange membrane, adding an organic salt of transition metal, and doping transition metal ions into the membrane. By taking advantages of catalytic characteristics of the transition metal ions, the fuel leaking from the anode of the cell can perform a catalytic reaction in time in the ion exchange membrane, and thereby improve an ion conductivity of the membrane and efficiently decrease a resistance of the cell.

Abstract: Disclosed is a novel III-V heterojunction field effect transistor comprising a substrate layer, a first semiconductor layer, a second semiconductor layer, a drain electrode, a source electrode, a gate electrode, a first dielectric layer, second dielectric layers and the like, wherein the first semiconductor layer has a greater bandgap compared with the second semiconductor layer, and the second semiconductor layer and the first semiconductor layer are combined to form a heterostructure. The thickness of the first semiconductor layer is not greater than the critical thickness of two-dimensional electron gas formed in a heterojunction channel, and thus natural 2DEG in the heterojunction channel is depleted. The novel III-V heterojunction field effect transistor has the advantages of being simple in structure, simple in preparation process, stable in performance, high in reliability and the like.

Abstract: A card reader controller engine includes an interface controller responsive to information. The engine is coupled to the interface controller and is configured to compress the information before the information is to be stored in a memory card. A master interface is coupled to the engine and is further responsive to the compressed information for storage in the memory card.

Abstract: A card reader controller engine includes an interface controller responsive to information. The engine is coupled to the interface controller and is configured to compress the information before the information is to be stored in a memory card. A master interface is coupled to the engine and is further responsive to the compressed information for storage in the memory card.