83 results about "Random structure" patented technology

This invention discloses new methods, security devices and apparatuses for authenticating documents and valuable articles which may be applied to any support, including transparent synthetic materials and traditional opaque materials such as paper. The invention relates to moire intensity profiles which occur in the superposition of specially designed random structures. By using specially designed random basic screen and random master screen, where at least the basic screen is comprised in the document, a moire intensity profile of a chosen shape becomes visible in their superposition, thereby allowing the authentication of the document. An important advantage of the present invention is that it can be incorporated into the standard document printing process, so that it offers high security at the same cost as standard state of the art document production. Another major advantage of the present invention is in its intrinsically incorporated encryption system due to the arbitrary choice of the random number sequences for the generation of the specially designed random dot screens that are used in this invention.

The invention discloses an automatic restoration method of a three-dimensional digital geometric grid model structure. According to the method, three-dimensional digital geometric grid models of random structures are converted into watertight two-dimensional manifold three-dimensional digital geometric grid models meeting 3D printing requirements. The method mainly includes the following steps that voxelization is carried out on input grid models, the models are converted into body representation forms piled by voxels from polygonal grid forms, and the obtained voxels are signed as internal voxels, external voxels and boundary voxels; each calculation unit including 8 adjacent voxels is analyzed, a mode of a surface patch generated in each calculation unit is determined according to the number and relative positions of the internal voxels, external voxels and boundary voxels of the each calculation unit, and the surface patches form output grid models; defect structures in the output grid models are detected and restored, normal vectors of the surface patches in the output grid models are rectified, the output grid models are calibrated by means of the input grid models, and the final output grid models are obtained.

The invention discloses a preparation method for a random crack test model. Different quantities of crack fragments with different thicknesses and different sizes are randomly doped into a continuous dielectric body model material, so that a test model capable of effectively simulating natural structural features such as cracks and joints of a rock body as well as the random structure feature distribution and a complicated dynamic environment of a rock body with a heterogeneity characteristic can be prepared, and a simulation test on the random crack rock body can be carried out. The model preparation process is simple and easy to operate; compared with the prior art, the preparation method has the advantages that the prepared rock body model is closer to an engineering rock body, and a test result is fitter to a real condition of the rock body. The preparation method for the random crack test model is applicable to large-size similar simulation tests and particularly relates to preparation of simulation test models which are used for similar simulation ore pressure observation, heterogeneous rock layer fluid and solid coupling simulation test, crushed coal rock body exploration simulation test and the like and have requirements on the structures of rock layers.

The invention discloses a preparation method of a bio-ceramic coating titanium-wire sintering porous titanium artificial bone, belonging to the biomedical engineering field. In the invention, a three-dimensional weaving method is utilized, a titanium metal fiber wire is constructed into a controllable structure model, a random structure model and a bionic structure model which can stimulate the bone trabecula and principal stress line of a human bone, and then is prepared into the porous titanium artificial bone through prepressing molding and vacuum sintering, after that, a sol-gel method is utilized to manufacture a gradient coating or a complex coating on the surface of the porous titanium artificial bone, so that the gradient coating transiting from titanium dioxide to bio-ceramics or the bio-ceramics-titanium dioxide complex coating is formed on the surface of the porous titanium artificial bone to obtain the bio-ceramic coating titanium-wire sintering porous titanium artificial bone. The preparation method not only can protect the titanium metal skeleton and prevent titanium ions from dissociating to enter a human body, but also can ensure that the titanium metal skeleton the surface of which is coated with the bio-ceramics has the biological characteristics, therefore, the bio-ceramic coating titanium-wire sintering porous titanium artificial bone can be applied to repairing clinical segmental defect of long bones.

The present invention discloses a Mach-Zehnder type silica optical waveguide switch based on narrow slit waveguide. After the wave splitting of the 3dB coupler which realizes power splitting function at the input end, a first group of two spot-size converting structures are respectively connected to the interference arms of two narrow slit waveguide structures, and then are connected to the output-end interference coupler through a second group of two spot-size converting structures. A random-structure 1*2 and 2*2 optical switches are formed through the different combination of two groups of spot-size converting structures. The present invention leads to a narrow slit waveguide and fills a low refraction ratio electrooptic material in the narrow slit. The modulation facility is enlarged, and the conventional indirect electrooptic modulation of carrier injection is switched to a direct electrooptic modulation. Besides, the silicon waveguides which are at two sides of the narrow slit and are electrically insulated naturally are taken as electrodes and the distance from the electrode to the modulation area is shortened. The two characteristics can equally increase the modulation efficiency of the switch. The whole structure is compact in dimension. The invention is compatible to the CMOS processing technique and provides a novel approach for the realization of the single-chip integrated high-speed electrooptic switch.

The present invention aims to provide a simple and reliable security element into a document, which can be recognized without special equipment. This aim is achieved with a paper or paper-like document with a surface, the surface being provided at least in a partial area with a background layer, wherein at least part of the surface of the document is provided with a security element comprising a series of protuberant structures spaced at regular interval. The protuberant structure creates a relief than can be easily recognized while rubbing the document. Contrarily to watermarks or other stamps, the fact that the structure is spaced at regular interval allows the user to better detect it over random structures. Regular interval does not mean that the space between each protuberant structure is equal. Regular means that each structure has a similar width and each space between the structures has also a similar width.

The invention provides a method for generating a random structure of a continuous fiber composite material and predicting the elastic performance of the continuous fiber composite material. The method comprises the following steps: generating a fiber model by a particle swarm algorithm, and optimizing the fiber model according to fiber jumping treatment to obtain particle space random distribution information for generating a three-phase RVE finite element model; and performing finite element simulation operation on the three-phase RVE finite element model to obtain a prediction result. Based on a representative volume element generation strategy of the particle swarm algorithm, the distance among fibers is controlled by the particle swarm algorithm in the process of generating the representative volume element, the requirement for the material volume percentage is fulfilled while fiber random distribution is ensured; and based on efficient generation of the representative volume unit and a homogenization theory, an elasticity prediction finite element model is established, a periodic boundary condition is applied, and the elasticity performance prediction result of the material can be obtained by microscomic finite element simulation, so that the efficiency of elasticity performance prediction is improved.

The invention relates to a low density parity check (LDPC) code check matrix construction method and a corresponding matrix multiply operation device. The method comprises the following steps that: determining the length n*L of a code word, the size L of a circulating replacement sub-matrix, a code rate L and number of rows m*L of a check matrix, wherein the size Hb of a basic matrix is m*n, the size H of the check matrix is mL*nL; determining best distribution of the check matrix H; constructing a basic matrix Hb with maximal loop length; exapdning the obtain basic matrix Hb to a quasi-cyclic-low density parity check (QC-LDCP) code with the loop length being maximized by selecting an appropriate movement factor, and determining the entire check matrix H by selecting the movement factor with element of a 1 position in the basic matrix Hb. The device comprises a check parity generating unit, an information sequence generating unit, a segmenting unit and a multiply unit. Due to the adoption of the method and the device, the coding complexity is reduced, the LDPC code with an error check performance being very approximate to a random structure is obtained, and simultaneously the realization complexity of the LDPC code is reduced.

The invention provides an optical flow tracking method and device. The method includes: generating a random structure according to an object to be tracked on an image; tracking all structure blocks in the random structure by an optical flow tracking algorithm to obtain location offset of the random structure; estimating a target location of the object to be tracked according to the location offset of the random structure. The random structure comprises at least two structure blocks having fixed relative locations. Each structure block comprises at least one feature point of the object to be tracked. The optical flow tracking method and device has the advantages that the feature points of the object to be tracked on the image are acquired, the random structures are generated from the feature points, each random structure is tracked so as to obtain location offset of the random structure, the location of the object to be tracked is estimated accordingly, tracking errors are reduced, and tracking precision is improved effectively.

Provided is a method of fabricating an organic light emitting device that may form a light scattering layer having an irregular random structure at a low temperature. The method includes providing a substrate coated with a precursor layer; sequentially forming a metal layer and an organic layer on the precursor layer; performing a heat treatment of the organic layer to form an organic mask from the organic layer; patterning the metal layer by using the organic mask to form a metal mask; patterning the precursor layer by using the metal mask to form a light scattering layer having an irregular random structure; removing the metal mask and the organic mask; and sequentially stacking a planarization layer, a first electrode, an organic light emitting layer, a second electrode, and a passivation layer on the light scattering layer.

A set of irregular LDPC codes having a pseudo-random structure and low encoding complexity. A block-cyclic LDPC code has an irregular row or an irregular column weight and includes a parity check matrix and an encoding matrix each of which has a pseudo-random structure. This allows the code to have the irregular row weight or irregular column weight together with an overall randomness to the code structure. Blocks within the code can be shortened, adjacent blocks of code can be overlapped, and adjacent columns within a block can be arbitrarily permuted so to change the weighting of rows and columns. The LDPC codes are particularly useful in two-way communications system for an electrical distribution system (1) to restore data lost or corrupted during its transmission.

The invention relates to a random structure conformal Hash information retrieval method. The random structure conformal Hash information retrieval method is characterized by including the steps of (1) protecting important structures of high dimensional data, conducting dimensionality reduction on original high dimensional data through a provided objective function, and accordingly obtaining low dimensional data; (2) calculating a basic dimensionality matrix and a low dimensionality matrix of the original high dimensional data through obtained updating rules of basic operators U and the low dimensional data V; (3) setting a threshold value, converting low dimensionality real number expressions in a training set into binary codes, and calculating Hash codes of a testing sample through probability statistics disaggregated model logistic regression; (4) calculating the Hamming distance, namely XOR operation, between the training data and the testing sample, and obtaining final results. By means of the random structure conformal Hash information retrieval method, on the basis that distribution of random data and the local and overall structures of the high dimensional data are protected, a Hash function is successfully obtained through the multivariable logistic regression, surpassing sample expansion can be achieved, and the random structure conformal Hash information retrieval method is suitable for computer visions, data mining, machine learning or similar searching fields.

A method (1) of developing software code for executing on a target digital processor uses a memory in which it maintains data structures having elements, each of the elements storing data which is represented by a label, and at least some links between the elements are created by the target processor as data is being processed. The method comprises the step (3) of writing the software code with data structure processing operations which comply with random structure preservation rules (2). A static analysis timing tool automatically parses (4) the code developed in step (2) to identify all operations. It determines (7) from an operation and all possible input states for that operation an average time value for execution of the operation by a target data processor, and stores (9) said average time value. It determines (8) from the operation and all possible input states all possible output states for that operation. The timing tool repeats steps (7 and 8) for each next operation, using the all possible output states determined in step (8) as all possible input states. It generates (11) an output total average time which is a sum of all average times stored in step (9).

The invention relates to a coding method for very short code-length density parity check code, which belongs to communication channel coding technical field; the coding method includes that a very short LDPC coding code has the code length of 372bits and code rate of 1/2; the operations of codeword overlapping, information bit shortening, check bit stuffing, check bit deletion and codeword random interleaving are performed on the obtained LDPC code to realize very short LDPC code coding with other code length and code rate. The coding method proposed in the invention has no loss on coding performance, even has better performance on local points. Meanwhile, compared with coding method based on completely-random structure matrix, the coding method in the invention is realized with very low complexity, and facilitates hardware implementation and has strong application prospect.

The invention provides a lead-acid accumulator electrode plate grid and a method for manufacturing the same, which includes a plate grid for manufacturing the lead-acid accumulator electrode plate, a thick plate grid cast by gravity, a thin plate grid rolled by at least once rolling. The method for manufacturing the lead-acid accumulator electrode plate grid includes steps as follows: collocating lead alloy; gravity casting the thick plate grid, the thick plate grid temperature reduces to less than 80 DEG C cooled by spraying pure water or natural cooled when the thick plate grid mold stripping; the thick plate grid is processed at least once rolling to reach pre-set thin plate grid thickness by the roller after the thick plate grid temperature is reduced less than 80 DEG C; coating plate machine plate on the rolled thin plate grid. The lead-acid accumulator electrode plate grid and method have advantages in that: the plate grid has a whole frame, and can be designed random structure according with design need; the plate grid decay resistance can be enhanced after being rolled many times, and decay resistance can be enhanced more than 50% by comparison with traditional plate grid.

The invention belongs to the anti-fake field, specially relates to the goods with the visible random anti-fake character. The invention discloses goods with the visible random anti-fake character, wherein the visible random anti-fake character is the visible random anti-fake character which is produced from the printing ink or paint in or after the printing or daubing processing.

The invention belongs to the anti-fake field, especially relates to a method of anti fake by utilizing the visible random structure character. The invention discloses a method of anti fake by utilizing the visible random structure characteristic an tifake method, wherein the key is that the visible random structure characteristic adopts the printing ink or paint during the printing and daubing-upprocess or the visible random structure character after the printing or daubing cup process.

The invention discloses a unidirectional fiber composite material random structure generation method and system. The method comprises the steps of generating fibers in initial states in sequence in an RVE window and performing random disturbance to obtain fiber position information; and then performing periodic maintenance on the fibers in the RVE window and building an RVE three-dimensional model according to the fiber position information. According to the unidirectional fiber composite material random structure generation method and system disclosed by the invention, an RVE with high volume fraction can be generated; fiber distribution has sufficient randomness; and the generated RVE can be periodically repeated.

The invention relates to pavement crack detection and evaluation methods based on a random forest, and the detection method comprises the following steps: firstly extracting features for Chi, and thentraining Chi through a random structure forest, wherein all the templates together form a template structure space; carrying out the binarization processing and expansion and erosion of an image block; secondly describing all the templates in the template structure space through new crack descriptors, and inputting the description features into a classifier for learning; and finally inputting anoriginal image into the classifier for classification, and recognizing the image block with a crack, wherein the image block with the crack is set as a binarization result corresponding to the image block, and an image block with no crack is set to white 0. The detection method can achieve the effective detection of the complex cracks of a pavement structure, avoids the impact from noise, and is high in crack detection accuracy. The evaluation method is used for the image block, achieves the judgment of the crack conditions of a pavement, and achieves the discovery of the potential safety hazards of the pavement.

The invention discloses an anti-counterfeit label for a random three-dimensional mirror surface graph and a preparing method thereof. The preparing method comprises the steps that a substrate layer is prepared; a random three-dimensional mirror surface layer is manufactured on the substrate layer; a random graph information enhancing layer is manufactured; the manufactured random graph information enhancing layer is bonded to the random three-dimensional mirror surface layer through a binding agent; a graph layer is printed on the surface of the random graph information enhancing layer; the substrate layer, the random three-dimensional mirror surface layer, the random graph information enhancing layer and the graph layer are sequentially arranged from bottom to top. The random three-dimensional mirror surface layer and the random graph information enhancing layer are of three-dimensional random structures completely, and different kinds of graph information are obtained under different light conditions, and can not be copied at all; when people try to transplant the label, the substrate layer will be fractured to cause damage to the random three-dimensional mirror surface layer, so that the graph information characteristic of the label is damaged. The anti-counterfeit label has the advantages of being high in anti-counterfeit strength, can not be copied or transplanted, and has wide application value in the technical field of counterfeit prevention.

A transmission device of a digital broadcasting system having an inner interleaver with an improved structure is provided to perform a bit interleaving process by a convolution interleaving method, and to carry out a symbol interleaving process by using an optional random lookup table, thereby improving randomized properties of an inner interleaver. The first and second RS encoders(12,22) RS(Read-Solomon)-encode the first and second TSs(Transport Streams). The first and second outer interleavers(14,24) re-array data encoded in the first and second RS encoders(12,22), respectively. The first and second convolution encoders(16,26) convolution-encode the re-arrayed data, respectively. An inner interleaver(30) consists of a bit interleaver(31) and a symbol interleaver(33). The bit interleaver(31) re-arrays the encoded data in bit unit by the convolution encoders(16,26). The symbol interleaver(33) re-arrays the data in symbol unit by a predetermined interleaving address of a lookup table. A modulator portion(50) digitally modulates the re-arrayed data, and transmits the modulated data.