Abstract:
Disclosed are a SIFT feature bag based bovine iris image recognition method, comprising the following steps: preprocessing an iris image to obtain and effective region; obtaining feature points by using a SIFT method; positioning an inner edge by using an active contour line method; removing the feature point in the inner edge to obtain an effective SIFT feature point set; performing comparison with an optimal SIFT feature bag to obtain a feature histogram; calculating the histogram distance between a to-be-recognized image and each image in a target iris library, and using an object corresponding to the target bovine iris image with the smallest histogram distance as an recognition result. The present invention can accurately perform recognition in cases of that the to-be-recognized bovine iris image is rotated, shifted, partially blocked, or inconsistent in scale, so as to improve the accuracy and reliability of bovine iris image recognition, thereby promoting application of the iris-based recognition method in the food traceability system.
Abstract:
The present disclosure provides a DMOS device with a junction field plate and its manufacturing method. A drain region is located on a surface of a semiconductor substrate. A source region is located in the semiconductor substrate at a bottom of a first trench. A gate electrode is located at the bottom of the first trench. Therefore, longitudinal voltage resistance is achieved, which may reduce a size of the entire device, decrease Rdson, and greatly optimize a relationship between voltage resistance and Rdson. The junction field plate improves an effect on reducing surface resistance. At the same time, a depth of trenches in the DMOS device may be reduced, and thereby a depth-to-width ratio of the device is reduced, improving the feasibility of increasing a voltage resistance level. Both the source region and the drain region in the DMOS device are led out on a same surface, which may be compatible with a technology for manufacturing a CMOS device. A second doped polycrystalline silicon layer includes a first doped sublayer and a second doped sublayer with different conduction types. Therefore, in a case of an N-type gate electrode, a P-type doped layer may be directly connected to a potential of the gate electrode, which improves an effect of the junction field plate.
Abstract:
Provided in the present application are a circuit board structure and a manufacturing method therefor, relating to the technical field of integrated circuits. The present application comprises stacking a plurality of circuit boards to be stacked, and using an adhesive medium capable of use in a normal-temperature low-voltage environment between each two adjacent circuit boards to be stacked for bonding to form a corresponding multi-layer circuit board body, in order to avoid the impact of a high-temperature high-voltage environment on the properties of the material, and effectively expand the number of layers of stackable circuit boards and the buildable structural thickness of the circuit board structure. The present application then comprises forming on the board surface of the multi-layer circuit board body at least one through hole penetrating through the multi-layer circuit board body and, for each through hole, using silver paste of matching viscosity to fill the through hole to form a conduction hole corresponding to the through hole, thus, by means of the silver paste filling process, solving the problem that the bonding medium is unable to sink copper and ensuring that the plurality of circuit boards to be stacked included in the circuit board structure can conduct effectively.
Abstract:
The present invention discloses an artificial intelligence (AI)-based urban design multi-plan generation method for a regulatory plot. The method includes operation steps performed by the following modules: (1) plot space calculation sand table module; (2) regulatory characteristic parameter input module; (3) characteristic case intelligent learning module; (4) plot road intelligent generation module; (5) plot landscape intelligent generation module; (6) plot architecture intelligent generation module; and (7) outputted plan auxiliary drawing module. By means of the AI-based urban design multi-plan generation method for a regulatory plot of the present invention, the planners realize real-time, accurate, and efficient feedback adjustment to a plurality of urban design plans under regulatory conditions, resolving a plurality of problems such as a long working period of a conventional design plan.
Abstract:
Disclosed is a heterojunction semiconductor device with a low on-resistance. The heterojunction semiconductor device comprises: a metal drain electrode (1), a substrate (2) and a buffer layer (3). A current blocking layer (4) is arranged in the buffer layer (3), a gate structure is arranged on the buffer layer (3), and the gate structure comprises a metal gate electrode (10), GaN pillars (5) and AlGaN layers (6), wherein a metal source electrode (8) is arranged above the metal gate electrode (10); and the current blocking layer (4) comprises multiple levels of current blocking layers, the centers of symmetry of the layers are collinear, and annular inner openings of the current blocking layers at all levels gradually become smaller from top to bottom, thereby effectively limiting a peak electric field and keeping same away from a channel, ensuring the voltage endurance capability of the device and reducing current loss. The AlGaN layers (6) and the GaN pillars (5) are distributed in a honeycomb above the buffer layer (3), and multiple channel currents are generated, thereby effectively improving the current capability, so that the device can obtain a higher on-state current during conduction, and the on-resistance of the device is thus reduced.
Abstract:
The invention discloses a flexibly suspended modular building structure, which comprises a vertical core tube structure. A conversion story is arranged at the upper end of the core tube structure, multiple modules with certain spaces reserved therebetween are hung below the conversion layer, the modules adjacent in the vertical direction are connected through a set of hanging rod members, the upper end of each hanging rod member is pin-connected to a ceiling beam located in the upper module, the lower end of each hanging rod member is pin-connected to a ceiling beam located in the lower module, the hanging rod member arranged on the uppermost module is pin-connected to the transfer story, and dampers are connected between floors of all the modules and the core tube structure. By means of suspension shock absorption technology, the horizontal loads inputted by the modules to the core tube structure are remarkably reduced, and the material consumption of the core tube structure is saved. The module building allows inter-story drift of secondary structure, prevents non-structural elements from damage, and extends the limit value of inter-story drift between modules, thus improving the energy dissipation and shock absorption efficiency. By introducing a limiting buffer device, relative displacement between the modules is controlled, and collision is avoided.
Abstract:
Disclosed are a SIFT feature bag based bovine iris image recognition method, comprising the following steps: preprocessing an iris image to obtain and effective region; obtaining feature points by using a SIFT method; positioning an inner edge by using an active contour line method; removing the feature point in the inner edge to obtain an effective SIFT feature point set; performing comparison with an optimal SIFT feature bag to obtain a feature histogram; calculating the histogram distance between a to-be-recognized image and each image in a target iris library, and using an object corresponding to the target bovine iris image with the smallest histogram distance as an recognition result. The present invention can accurately perform recognition in cases of that the to-be-recognized bovine iris image is rotated, shifted, partially blocked, or inconsistent in scale, so as to improve the accuracy and reliability of bovine iris image recognition, thereby promoting application of the iris-based recognition method in the food traceability system.
Abstract:
The present invention is a method for optimal control of an open space surrounding building form based on sky view evaluation. The method includes the following steps: vectorizing an existing planning scheme, and establishing a 3D model; classifying open spaces in the model, 360°-scanning for mean elevations, calculating and simulating sky views of a whole region, generating a 3D contour plot, and rasterizing the 3D isogram, such that each grid has an open space classification attribute and a sky view value; performing optimal adjustment of the building form on an open space surrounding region having a sky view value that is inconsistent with a corresponding preset sky view index within the range of the whole region, and bringing an adjusted scheme into the model for calculation again, till the sky view value is consistent with the corresponding preset sky view index. The present invention, from a human-oriented point of view, presents a guide on optimal control of an open space surrounding building form in terms of a quantitative sky view index, thereby providing a scientific basis for creating a 3D material space of a city that has comfortable dimensions for people.
Abstract:
Disclosed in the present invention is a method for defining circles of a dynamic urban spatial structure, which includes the following steps: collecting mobile phone user location data; cleaning and processing the data, to obtain matched mobile phone user location data; merging, by taking a base station as a unit, matched mobile phone user location data on all hours into mobile phone location data on each day according to dates; for merged base station information, through a Tyson Polygon processing method, spatially positioning, within a whole city, base stations each serving the different numbers of users; proportionally allocating, according to the area of each land block, data of the numbers of users in polygons to blocks covered by the polygons, to obtain the number of mobile phone users in each land block; and obtaining, through a spatial analysis method of the Kriging interpolation method in ArcGIS, a numerical rule of multi-circle distribution of mobile phone users at each time point and on each day, then finding numerical critical points, and merging circles within a same region, to generate a distribution diagram of the circles of the dynamic urban spatial structure. The present invention fully relies on existing mobile communication network resources, and has advantages of low cost, high frequency, automation, high accuracy, and numerous samples.