101 results about "Random rotation" patented technology

The invention relates to the field of microwave antenna array design, and in particular relates to a RCS reduction method for a phased-array antenna. The method mainly comprises the steps of: assuming that the phased-array antenna comprises N array elements and then there are N feeding points correspondingly, and regularly arranging the N feeding points in a rectangular grid shape; and then rotating each array element by a random angle around the feeding point of the array element. The RCS reduction method for the phased-array antenna has advantages that the array RCS can be reduced greatly under the condition that the loss of the array radiance property is basically avoided; the RCS reduction can be realized just by the random rotation of the array elements; compared with traditional measurements such as structure forming and antenna housing loading, the design is easier, the realization is easier, the process is easier and the cost is lower; in addition, the array elements rotate around the feeding points, and the array elements retains the regular arrangement structure of the feeding points although the array elements are not regular, so that the process difficulty and cost are not increased basically, the connection between the array antenna and a rear-end T / R assembly is facilitated, and the requirement of phased-array application is met.

The embodiment of the invention discloses an acquiring method of a live face head pose detection regression apparatus. The method comprises the following steps of: A, acquiring three-dimensional model data of the face as training sampling sets; B, selecting face feature points in the three-dimensional model data; arbitrarily conducting random rotation and random translation exchange to the face feature points in the space by a camera imaging model and projecting the face feature points in a camera imaging plane to acquire two-dimensional coordinate plane sets composed of two-dimensional coordinates of the feature points, corresponding Euler angles of all two-dimensional coordinate planes in the two-dimensional coordinate plane sets, and a rotation matrix of corresponding relation between all two-dimensional coordinate planes and corresponding Euler angles thereof; C, according to two-dimensional coordinates of the feature points, the Euler angles and the rotation matrix, acquiring the head pose regression apparatus by a least square method. In the embodiment, the acquiring method is beneficial to improve face identification effectiveness.

The present invention provides a 3D model retrieval system designed to extract feature vectors of 3D models to retrieve a similar model. Image feature vectors are extracted by subjecting target 3D models to rendering from various directions by using a random rotation generator and a 2D image generator. Then, the image feature vectors are registered in an image feature vectors database. Image feature vectors are extracted by subjecting a query 3D model to rendering from various directions by using another random rotation generator and another 2D image generator. The image feature vectors are compared to the contents of the image feature vectors database, thereby retrieving a 3D model.

The invention discloses a pattern recognition method based on a deep convolution neural network, mainly a pattern recognition method based on a deep convolution neural network and introducing an attenuation mechanism and an image enhancement means. Take that sample data set first, the dataset images are annotated by relevant professionals, to gray-scale an image, This highlights the outline of themain objective, so that feature extraction is facilitate, Then the data set is expanded by random rotation and different angles, and the image data is enhanced and pre-processed. Finally, a depth convolution neural network is constructed, which can extract image features efficiently. The model is trained and tested by 50% cross-validation of the established data set, and the vision-assisted detection model is constructed. The invention has higher operation efficiency in sample identification, and the model parameter is reduced, which reduces the occupation of resources and the high demand forsoftware and hardware, and can be put into actual use better.

The invention is related to transmitting / receiving method in quasi-orthogonal time space group code, receiver and transmitter and corresponding comm. system. Random rotation matrix is obtained through Graham-Schmitt orthogonalized decomposing plural gauss random square matrix. After using multiplication between random rotation matrix and symbolic vector of planisphere, the transmitting terminal carries out encoding quasi-orthogonal time space group code so as to make new planisphere possess characteristic of random distribution. Thus, interferences among multiple antenna symbols at transmitting end are distributed evenly. Moreover, distribution of probability density in high power interference segment is smaller relatively so as to raise performance of system in high SNR. Accordingly, all possible symbolic vectors of planisphere at receiving end are carried out rotation same as transmitting end randomly and then maximum likelihood decoding is carried out.

At one node in a wireless communications network, a transmitter (i) encodes an outgoing data stream as a sequence of outgoing symbols of a symbol constellation, (ii) applies a sequence of random rotations to the outgoing symbols to generate an outgoing sequence of rotated symbols in the same symbol constellation, and (iii) transmits wireless signals based on the rotated symbols. At another network node, a receiver, having knowledge of the sequence of random rotations, (i) recovers an incoming sequence of rotated symbols from the received wireless signals, (ii) applies a corresponding sequence to de-rotations to the recovered rotated symbols to generate a sequence of de-rotated symbols, and (iii) decodes the de-rotated symbols to recover an incoming data stream that is ideally identical to the outgoing data stream. An eavesdropping node in the network that does not have knowledge of the sequence of random rotations is unable to recover meaningful data.

The invention provides a boat helm / wing rudder discretional rotation angle transmission device. The invention consists of a main rudder blade, a main rudderpost, a photo-electricity encoder, a wing rudder leaf, a wing rudder shaft, a wing rudder driven gear, an internal bearing, a turbine sleeve shaft, an external bearing, a worm motor component, an external base seat, a gear bearing, a bottom seat, a main shaft drive gear, a middle supporting plate, an upper base seat, a harmonic reducer, an input shaft sleeve, an upper cover, a top motor supporting cover, a main shaft motor, a top encoder supporting cover, an encoder coupler, a photo-electricity encoder, a main shaft driven gear, a frame, etc. The invention enables the rotation of the wing rudder out of the restriction of the main rudder, namely, a small control surface which correspondingly and independently motions is added on the rudder to obviously improve the fluid power performance of the rudder, thus improving the course control performance of the rudder system. The invention has the advantages of reducing the energy consumption, improving the reliability and improving the navigability of the boat.

The invention relates to an aerial photograph image tower identification card fault diagnosis method based on depth learning. The method comprises the following steps of: establishing a pole and toweridentification card detection image library and a tag library thereof; estalbihsing the image library and tag library of tower leg detection; establishing a tower identification card status classification image library and its label library; establishing the deep learning object detection mode Faster R-CNN, including the basic network NasNet, a zone Proposal Network and a Fast R-CNN detection network; establishing a depth-learning image classification model ResNet; traninig the established detection model or classification model on the prepared galleries, and performing data enhancement on the input data of each iteration in the training process, including random rotation, random fill-in cropping and random grayscale. According to the relative position of the detected tag and the tower leg, the fault of tower tag falling off is diagnosed. If there is no tag falling off, the state of the tag is diagnosed by using the classification model.

The invention discloses a point cloud feature extraction method based on a spatial attention mechanism. The method comprises the following steps of: a, point cloud preprocessing: performing downsampling by utilizing a farthest point sampling algorithm; b, point cloud data set expansion: increasing the number of the point cloud training data sets by adding disturbance and random rotation, wherein point cloud data enhancement is not needed in the reasoning stage; c, point cloud feature acquisition: utilizing a double-flow network idea and one neural network branch to extract point cloud spatialfeatures, and using the other neural network branch to extract semantic features of point cloud overall information; and d, fusing semantic information of the two point cloud feature extraction networks layer by layer to obtain a feature vector of each point cloud. And e, after the point cloud features are obtained, performing further feature extraction on each point by utilizing a local space attention module, and finally obtaining a final classification or segmentation result through a full connection network. According to the method, a more accurate result can be obtained in a point cloud classification and segmentation task by using a double-flow network and a local space attention mechanism.

A degenerate pseudo-random rotation sensor is provided in the invention. The code disc is made up of a clock code track and a pseudo code track which is encoded in the whole circle by the binary pseudo-random sequence. It is: (1) it expresses the whole circle is divided into m parts by the closed ring composed by the m binary code sequence, the m is the positive integer; (2) the angle position code is the series of n binary code, the n is bigger than 4; (3) the m is less than 2n; (4) the angle position code is the only and the m different angle position codes are correspondence with the m angle position in the whole circle. The invention can save the space and the time by using the topological diagram to encode the circle pseudo-randomly. The photoelectric rotation sensor can provide the digital rotary parameter of the position, the speed and the direction at the same time; also it can keep the data reliability as the absolute formula.

The invention discloses a method for solving three-dimensional coordinate conversion parameters with random rotation angles. The method comprises the following steps: firstly, obtaining three-dimensional coordinates of common points under two coordinate systems; secondly, establishing a Bursa conversion model; thirdly, establishing a constraint equation; fourthly, establishing an error equation; fifthly, solving the error equation; sixthly, calculating errors in unit weight; seventhly, estimating validity of a rotation matrix, scale factors and three-dimensional translation components according to a variance-covariance matrix; eighthly, displaying results of the rotation matrix. According to the method, nine parameters in the rotation matrix are taken as unknown parameters, and the constraint equation is established as a constraint condition to be introduced into the error equation for solving parameters of the three-dimensional coordinate conversion with the random rotation angles;; the method is rigorous, the mathematical model is simple and easy to realize, the unknown parameters do not need to be linearized, and initial values of the rotation angles in the two three-dimensionalcoordinate systems can be randomly given.

The invention discloses an entanglement-preventing winder, which comprises a holder, a cross rod, damped winding rollers and outlet clips; the cross rod is horizontally fixed on the holder; the damped winding rollers are mounted on the cross rod in a damping manner; and the outlet clips are located under the damped winding rollers and respectively correspond to the damped winding rollers. The entanglement-preventing winder adopts the damping method to limit the random rotation of the winding rollers, thus preventing the threads on the winding rollers from being entangled. Meanwhile, the entanglement-preventing winder also utilizes the outlet clips to further enhance the entanglement-preventing effect.

The invention relates to a transforming domain geometric-attack-resistant gray level image digital watermark technology which can resist to general image processing attacks, meanwhile, can effectively resist to image rotation and equal proportion zooming attacks, and can solve the problem that overlarge embedding strength has influences on human eye vision effects. According to the technical scheme, a two-dimension code technology and contourlet converting characteristics are combined to embed two-dimension codes into a gray level image, meanwhile, safety of the two-dimension codes is guaranteed through an encryption method combining substitution and replacement of character strings, a quantization mode is adopted to blindly extract watermark information, and the problem that the image cannot resist to random rotation and equal proportion zooming is solved by the two-dimension codes. The transforming domain geometric-attack-resistant gray level image digital watermark technology can effectively solve the problem that the image can not resist to random rotation and equal proportion zooming attacks, can also resist to the general image processing attacks in a certain degree, and can be widely applied to copyright protection on bigger digital images (not less than 1024*1024 pixels).

The invention provides a grouping pseudo random rotation thermometer decoding circuit comprising a D-trigger module which is used for data transmission; a connection module which is used for performing binary weight distribution on data outputted by the D-trigger module and generating a thermometer code with binary weight and is connected with the D-trigger module; and a randomizer which is used for performing randomized rotation processing on the thermometer code outputted by the connection module and is connected with the connection module. According to the grouping pseudo random rotation thermometer decoding circuit, conversion speed and precision of a digital-to-analog converter can be enhanced. Meanwhile, the circuit design is simple in structure so that area of the decoding circuit can be reduced.

A physical layer secret communication method based on modulation symbol phase rotation is provided; a rectangular MQAM symbol is formed by stacking P mutually independent 4QAM symbols; the P 4QAM symbols phases are rotated in random, thus safely transmitting data between users; the method comprises the following steps: legal users use channel state information, and use a channel reciprocity theorem and a negotiation mechanism to determine the seed number of a chaotic sequencer used for generating a random number; the method periodically updates the seed number, resets the chaotic sequencer so as to generate a new chaotic sequence, and uses an interleaver to process the generated chaotic sequence set, thus obtaining approximately independent P groups of uniform distributed random sequences. The channel reciprocity and negotiation mechanism can ensure the dual-party phase rotation consistency, and the channel randomness can ensure a wiretapper cannot obtain a random rotation phase consistent with a sending terminal. The method allows legal users to safely transmit data under static state or quasi-state channel environments with high safety.

The invention discloses a three-dimensional tooth model construction method and system based on Unity 3D. The method comprises the following steps: step S1, scanning a tooth body to obtain image data,carrying out image processing on the tooth body image data, and carrying out three-dimensional reconstruction on the tooth body according to a tooth body image through a three-dimensional reconstruction technology to obtain a three-dimensional model of the tooth body; S2, manufacturing tooth grinding sheets, and establishing a digital tooth grinding sheet image library by collecting the submirrorstructure of each tooth grinding sheet; Step S3, utilizing the Unity 3D, introducing a tooth body three-dimensional model into the Unity 3D, adjusting the three-dimensional model of the tooth body; obtaining a final three-dimensional tooth model. according to the three-dimensional tooth model, achieving random rotation, zooming and display of specific structure information of the tooth accordingto the final three-dimensional tooth model, providing an internal and external structure of the tooth. The method can solve the problems that a laboratory is lack of the tooth model and students are difficult to collect the tooth with complete tooth positions and typical structures.

The invention discloses a mathematics probability teaching demonstration device, comprising a bottom plate; support legs are integratedly formed on the lower end of the bottom plate; the lower end of the bottom plate is provided with an iron plate through adhesion; the lower end of the iron plate is provided with a magnet; the upper end of the bottom plate is provided with a connection handle through welding; the connection handle is provided with a positioning plate through a bearing; the outer rim of the positioning plate is provided with positioning holes; the connection handle is provided with a positioning bolt matching with the positioning holes; and a main shaft is integratedly formed on the upper end of the positioning plate. The mathematics probability teaching demonstration device realizes the direct demonstration function during the probability teaching through designing a random rotation plate of an inner-outer plate. Besides, the mathematics probability teaching demonstration device also has the function of regulating the inclination angle of the plate, and regulates the inclination angle of the demonstration plate in real time according to the requirement. The invention is simple in structure, gives a strong visual impression, and maximally satisfies various demonstration requirements on the class.

A computer implemented method for encoding bits by qubits to perform information-theoretically secure quantum gate computation, according to which pairs of quantum bits consisting of a first qubit as an encoding of “0” and a second qubit as an encoding of “1” are randomly selected, such that the first and second qubits are orthogonal to each other as quantum states and are interchanged by a NOT gate. Each qubit rotating to a desired initial direction and then each rotated qubit is further rotated to its antipodal direction by applying a quantum NOT or CNOT gate to the each rotated qubit, without any knowledge about the desired direction. A unitary gate is further applied over the qubits, using an ancillary |0 qubit that creates an equally weighted superposition of the qubits.

The invention relates to a natural scene text position detection method based on image segmentation. The method comprises the following steps: selecting a data set; selecting and marking images containing characters, and making a training set and a test set; data enhancement: 1, random rotation: randomly rotating the picture at a probability of 0.25; 2, random cutting; 3, random color disturbance;constructing a training neural network, wherein the VGG16 is used as a basic network; a full connection layer of the network is changed into a convolutional layer, the output of Pooling5 is kept unchanged, Fc6 is changed into a 7 * 7 * 512 convolutional layer, Fc7 and Fc8 are changed into a convolutional layer by using a 1 * 1 convolutional kernel, pixel-by-pixel prediction is carried out on thetext according to a segmentation idea, and finally, a prediction result of each pixel point is obtained; designing a loss function; and carrying out post-processing on the training result.

The invention discloses an active phased array antenna based on a honeycomb skeleton and an array forming method thereof. The number of the honeycomb and the number of the antenna units in the honeycomb are calculated according to the front scale. Generating each cellular coordinate point, and closely arranging each cellular in the cellular antenna array; Generating a random submatrix in a honeycomb, namely a submatrix circle; A subarray circle is randomly rotate and installed in each honeycomb; The pattern of cellular antenna array is calculated by substituting the average pattern of antennaelements. Repeat the above steps until the array results meet the requirements. The random distribution of antenna elements in the subarray circle and the random rotation of the subarray produce the antenna array with strong randomness of antenna element distribution, effectively destroy the superposition of the pattern scanning grating lobe in the radiation space, and weaken the scanning gratinglobe.

A digital-to-analog converter and a performing method thereof are disclosed. The digital-to-analog converter includes a random rotation unit, a plurality of conversion units, and a summing unit. The random rotation unit receives a plurality of binary-weighted inputs and generates a plurality of rotated digital outputs according to a random rotation number. The conversion units respectively receive one of the rotated digital outputs and generate a respective analog output. The summing unit sums the respective analog outputs of the conversion units for generating an analog output. The present invention implements the dynamic element matching technique by randomly rotating the binary-weighted inputs, so as to reduce the manufacturing cost of the digital-to-analog converter.

The invention relates to an accelerator operation handle device for engineering machinery. The accelerator operation handle device comprises a shell, an accelerator trigger, a handle and an accelerator line, wherein a clamping claw and a driving plate are arranged in the shell; a hole I, a hole II and a hole III are formed in the shell; the accelerator trigger penetrates through the hole I and sleeves the shell; the driving plate is connected with the accelerator trigger; a bayonet I is formed in the driving plate; a rotating shaft I is fixed on the inner wall of the shell; the handle extends into the shell from the hole II and sleeves the rotating shaft I; the clamping claw is connected with the handle and sleeves the rotating shaft I; the clamping claw is provided with a shifting claw I; the shifting claw I can be clamped into the bayonet I to limit the rotation of the driving plate and the accelerator trigger; the accelerator line penetrates through the hole III and is connected with the driving plate. According to the accelerator operation handle device, the handle is used for controlling the clamping claw to clamp the driving plate, thus limiting the random rotation of the driving plate and the accelerator trigger; before an accelerator is adjusted by the accelerator operation handle device, the handle is required to be driven to start safety protection to prevent mis-operation, so that the safety of the operation on the accelerator operation handle device is improved.

The invention relates to a locking device, and in particular relates to a magnetic locking device for realizing random rotation of a fixed rotating door or other freely rotated facilities. The magnetic locking device comprises a magnetic suction support seat, a magnetic suction cup, a rubber mat and a suction plate support seat. Compared with buckling type locking, the magnetic locking device not only has reliable locking function, but also has the advantages of being simple in structure, free from noise and long in service life.

A bonus game is initiated, with a processor, based upon a predetermined criteria in a base game being met, the bonus game having a plurality of bonus game reels. Further, an initial random spinning is performed, with the processor, of the plurality of bonus game reels to obtain an initial plurality of bonus game symbols on each of the plurality of bonus game reels. In addition, the process provides a prize distribution based upon the initial plurality of bonus game symbols matching at least one of a plurality of predetermined paylines. A random determination, for each of the initial plurality of bonus game symbols that is not a wild symbol, is performed to determine a wild transformation status based upon the initial plurality of bonus game symbols not matching the at least one of the plurality of predetermined paylines.

The invention discloses a biaxial multi-channel coarse powder separator. The biaxial multi-channel coarse powder separator comprises a feed pipe; the top of a return pipe is fixedly connected with anouter cone; the side, far from the outer cone, of a wear resisting plate is fixedly connected with a wear resisting bushing; the end, far from the outer cone, of a support rod is fixedly connected with an inner cone; the inner wall of a cylindrical outer shell is fixedly connected with a separation middle layer through locking bolts; the surface of a first rotating shaft is fixedly connected witha first guide baffle plate between the inner cone and the separation middle layer; the surface of a second rotating shaft is fixedly connected with a second guide baffle plate between the separation middle layer and the cylindrical outer shell; locking devices are arranged on the outer surface of the cylindrical outer shell and positioned on the first rotating shaft and the second rotating shaft;and the biaxial multi-channel coarse powder separator relates to the technical field of pulverized coal separation. The biaxial multi-channel coarse powder separator achieves the effects of multiple channels, multiple times of separation and locking, is simple in structure and convenient to use, saves both time and power, prevents random rotation, improves the separation effect, and improves the working efficiency.

The invention relates to a device and method for depositing a modified coating on the surface of a ball, in particular to a device and method for depositing a modified coating on the surface of a precision ball. In the preparation technology of depositing the modified coating on the surface of the ball, a method of controlling a ball body to do intermittent random rotation is a main method for achieving the integrity of the coating deposited on the surface of the ball, the evenness of the coating deposited on the surface of the ball doing intermittent random rotation has certain deviation, and consequently the requirement for the precision of ultra-precision ball elements cannot be met. At least one set of three-phase channel is machined on the surface of a bottom disc in sequence from inside to outside in the radial direction of the bottom disc. The disc face of a middle-layer holder is sequentially provided with at least one limiting ring. Each limiting ring comprises a plurality of locating holes. Each locating hole is formed by three equal-size round holes in the manner that every two round holes are tangent. A drive ball is arranged in each round hole. Each through hole combination comprises a plurality of precision ball penetrating holes, and the precision ball penetrating holes in the through hole combinations and the locating holes are formed in a vertical one-to-one correspondence manner. The device and method are used for the process of depositing the modified coating on the surface of a precision ball element.

The invention provides a locking device and a high-speed train equipment ceiling board. The locking device comprises a sleeve and a clamping spring; a gear structure is arranged on the inner wall of the sleeve, and the sleeve is fixedly arranged on a part to be connected; the clamping spring comprises a soleplate and two lateral plates, wherein the two lateral plates are fixedly arranged on the opposite sides of the soleplate; a positioning hole is arranged on the soleplate, the two lateral plates are respectively provided with an outward hem, and each outward hem is provided with a zigzag structure; and the clamping spring is inserted into the sleeve, so that the zigzag structure and the gear structure are engaged, and a fastening device on the part to be connected is inserted into the positioning hole. Through compacting the two lateral plates of the clamping spring and inserting the clamping spring into the sleeve, the zigzag structure of the clamping spring and the gear structure in the sleeve are engaged together, the fastening device is simultaneously inserted into the positioning hole of the clamping spring, and the clamping spring can not randomly rotate after the zigzag structure and the gear structure are engaged, thereby limiting the random rotation of the fastening device through the positioning hole, and improving the reliability of the fastening device.