44 results about "Composite Sequence" patented technology

A system and method for generating a digital certificate is provided wherein a new digital record is received and is assigned a sequence value. A first composite digital value is generated by applying a first deterministic function to the digital records stored in a repository. The sequence value and first composite digital value are included in a first certificate. After the digital record is added to the repository, a second composite digital value is generated by applying a second deterministic function to the digital records in the repository. This second composite digital value, and a composite sequence value, are published. An interval digital value which is based upon the first and second composite digital values, and the sequence value, are included in a second certificate which thus verifies the authenticity and sequence value of the digital record.

The invention provides a remote underwater acoustic communication method based on soft-demodulation soft-decoding joint iteration. The method comprises the following steps that: a transmitting end performs low density parity check (LDPC) coding on a binary information sequence which is sent by a signal source, performs quaternary phase shift keying (QPSK) modulation and Gray mapping, maps code elements to one of four positions in a constellation diagram by taking two code elements as a group, performs Walsh-m composite sequence spectrum spreading to obtain a signal to be transmitted, and converts a digital signal to be transmitted into an underwater acoustic signal; and an underwater acoustic transducer at a receiving end converts the received underwater acoustic signal, de-spreads by using a composite sequence which is the same as that of the transmitting end to obtain a receiving signal, performs self-adaptation decision feedback equalization to obtain an amplitude fading complex signal, performs soft-demodulation soft-decoding joint iteration on the signal, stops joint iteration after set iteration frequency is reached, performs belief propagation (BP) decoding on an LDPC decoder and outputs a bit value to a sink. By the method provided by the invention, the reliability of remote underwater acoustic communication is improved. The method is applicable to the remote underwater acoustic communication.

A system and method for generating a digital certificate is provided wherein a new digital record is received and is assigned a sequence value. A first composite digital value is generated by applying a first deterministic function to the digital records stored in a repository. The sequence value and first composite digital value are included in a first certificate. After the digital record is added to the repository, a second composite digital value is generated by applying a second deterministic function to the digital records in the repository. This second composite digital value, and a composite sequence value, are published. An interval digital value which is based upon the first and second composite digital values, and the sequence value, are included in a second certificate which thus verifies the authenticity and sequence value of the digital record.

Under control of composite sequence generated by plaintext, sub system of autoregressive non-linear digital filter modulates plaintext to chaos locus in high dimension in composite filter. Hashed value of plaintext is produced by quantizing chaos locus in coarse granulation. Iterative initial point of composite filter is as cipher key of algorithm, which satisfies requirement of security of Hash algorithm with cipher key. Sensitivity and traversing characteristic on initial value of chaos in high dimension makes hashed result sense to plaintext exceedingly. Moreover, hashed result is distributed in hashed space evenly. The composite sequence increases randomness selected by sub system of filter so as to guarantee complex sensitive nonlinear relation between iterative locus and initial condition. Thus, the invention possesses better scrambling, and stronger capability for anti deciphering. Features are: simple and fast algorithm, easy of modularized realization.

The invention provides a rapid pollution incident detection method based on a traditional online monitor, and belongs to the technical field of environmental engineering water treatment. The method includes the steps: building a pollution-free background database and a polluted background database; building composite sequences, presetting model parameters and optimizing training to obtain optimal parameters; building optimized pollution incident detection recognition matrixes, and recognizing pollution incidents in real time. The pollution incidents can be determined in a short time by the aid of traditional online monitors universally mounted at current monitoring points when abrupt pollution incidents happen, misinformation of the pollution incidents caused by instrument noise fluctuation is effectively avoided, online monitoring cost of the pollution incidents can be greatly reduced as compared with emerging online monitoring technology, all pollutants possibly causing the pollution incidents are covered, and safety and reliability of a water system are furthest guaranteed.

The invention relates to the field of underwater acoustic communication, particularly to a fast and accurate synchronization method for spread spectrum underwater acoustic communication. The method adopts an m sequence cyclically extended as a frame header, a receiving end uses an m-sequence thumbtack-shaped time-frequency blur characteristic and adopts the fast Walsh transform processing to successively perform frequency deviation coarse and fine search and estimate the initial frequency deviation value of a frame header signal, and a sliding correlation method is used to estimate the starting moment of the frame header signal, so as to complete frame synchronization. A time and frequency synchronization tracking loop is designed by adopting fast Walsh transform processing to further complete time and frequency tracking on each spread spectrum symbol in a frame body. The method has the advantages of overcoming the defect that the conventional method needs to store a plurality of PN sequence versions of different frequency offset, thereby occupying a small amount of storage, and using the FWT processing to reduce the amount of calculation to a large extent, and the composite sequence generated by the m sequence as a spread spectrum sequence; therefore, the method is suitable for spread spectrum underwater acoustic communication of M-ary and PPM hybrid modulation, and has good real-time performance and practicality.

The invention relates to an asymmetric short circuit current DC component decaying time constant acquisition method. The method comprises the following steps: 1) according to the type of asymmetric short circuit fault happening to a power system, a 120 composite sequence network formed by a 1 sequence network, a 2 sequence network and a 0 sequence network is built correspondingly; 2) according to the connection relationship of the 120 composite sequence network, the decaying time constant of a DC component in the short circuit current is calculated. Compared with the prior art, the method has the advantages of simple modeling, high calculation precision, wide applicability and the like.

A receiver architecture is disclosed for use in Time-Division Multiple Access (TDMA) and related digital radio applications which combines the principal benefits of the conventional hard-limiting and linear receiver architectures to support switched-antenna diversity and multipath equalisation without the need for receiver gain control. A further feature of the receiver architecture is that minimises the dynamic range needed by the digital signal processing stages thereby reducing complexity, power consumption and cost compared to known arrangements. The (TDMA) radio frequency signal is separated into two components by the analogue section of the receiver: one component characterising the signal's phase, either absolute or differential, the second component characterising the signal's instantaneous magnitude. The (constant-envelope) phase component is digitised by an analogue-to-digital converter (ADC) to form a sequence of phase samples. In a parallel path, the magnitude component is digitised by a second, synchronised ADC, digitally processed to obtain a sequence of coefficients characterising the normalised envelope variations and this is then combined with corresponding (in time) samples of the phase sequence to form a single, composite sequence characterising both the phase and amplitude variations of the received radio frequency signal. This composite sequence is then processed by a digital demodulator / equaliser to recover the transmitted data.

The invention discloses a calculation method suitable for a transfer rate matrix of a composite state spatial model. The calculation method comprises the following steps: 1: dividing a research object into subsystems, and determining a composite sequence; 2: establishing the state spatial model of each subsystem, and listing and writing the transfer rate matrix; 3: adopting a transfer frequency conservation principle to carry out state merging on the subsystems to obtain the transfer rate matrix after subsystem is simplified; 4: according to a composite sequence, successively combining, correcting and simplifying the subsystems to finally obtain the transfer rate matrix corresponding to the state spatial model of the research object; and 5: substituting the transfer rate matrix of the research object into a state space method calculation formula to obtain each steady-state probability of the research object. The calculation method can adopt the formula to directly list and write the transfer rate matrix corresponding to the combined state spatial model, so that the combination and simplification process of the state spatial model can be realized through programming software including Matlab and the like, and a state spatial algorithm is convenient and universal.

The invention discloses a method for calculating cross-voltage fault current of mixed-voltage double-line single phase crossing single phase on same tower. The method comprises the following steps of respectively calculating positive and negative sequence impedances and positive and negative sequence networks of two power distribution systems with different voltage classes which are reduced to a fault port; measuring a double-line zero sequence constant network between the two power distribution systems with different voltage classes; according to the double-line zero sequence constant network, calculating and unifying an equivalent zero sequence network of the two power distribution systems with different voltage classes; according to the positive and negative sequence networks and the equivalent zero sequence network, combining into a composite sequence network diagram of the two power distribution systems with different voltage classes; according to the positive and negative sequence impedances, calculating the boundary condition of the cross-voltage grounding fault of single phase crossing single phase; according to the composite sequence network diagram and the boundary condition, calculating the fault current. The method has the advantages that by utilizing the double-port network theory, the calculating accuracy of the cross-voltage fault of the mixed-voltage double-line on same tower is guaranteed, the high-order matrix operation is avoided, and the calculation is simple and reliable.

The invention discloses a single-phase earth fault rapid linear calculation method applied to an unbalanced distribution network. Based on the thought of a sequence component method, compensation is performed on asymmetric elements by the adoption of a controlled power source on the basis of using symmetrical component transformation, and meanwhile a phase shift process under different fault phases is simplified. Through the processing, a composite sequence network model suitable for single-phase earth fault calculation of the unbalanced distribution network can be obtained, and the model cancontinue to be simplified into a seven-node simplified linear calculation model. By use of the seven-node simplified calculation model, positive sequence voltages, negative sequence voltages and zerosequence voltages of substation buses and fault ports can be calculated, a positive sequence current, a negative sequence current and a zero sequence current of each feeder are calculated according tothe positive sequence voltages, the negative sequence voltages and the zero sequence voltages, and therefore single-phase earth fault calculation on the unbalanced distribution network is realized. Through the method, the calculation process of solving a single-phase earth fault of the unbalanced distribution network is greatly simplified, low-dimensional linear solving is realized, and calculation speed is increased.

A system and method for generating a digital certificate is provided wherein a new digital record is received and is assigned a sequence value. A first composite digital value is generated by applying a first deterministic function to the digital records stored in a repository. The sequence value and first composite digital value are included in a first certificate. After the digital record is added to the repository, a second composite digital value is generated by applying a second deterministic function to the digital records in the repository. This second composite digital value, and a composite sequence value, are published. An interval digital value which is based upon the first and second composite digital values, and the sequence value, are included in a second certificate which thus verifies the authenticity and sequence value of the digital record.

The embodiment of the invention discloses a private data identification and processing method and device, equipment and a computer readable medium. According to the scheme, the method comprises the steps of determining position information and sequence privacy type information of a privacy sequence in multiple pieces of data of a target field by adopting a pre-trained named entity recognition model, wherein the privacy structure types comprise a non-privacy structure type, a single sequence privacy structure type and a composite sequence privacy structure type; further determining a privacy structure type of the target field; and then adding a label used for representing the privacy structure type of the target field to the target field, wherein the label can be used for indicating to adopt a data desensitization mode corresponding to the label to perform desensitization processing on the data of the target field.

The present invention proposes one composite sequence bus device with concentrator connecting layer and UTMI interface. It is connected to system unit via USB cable. The device includes one USB entity layer, one concentrator connecting layer and several functional connecting layers. The USB entity layer is for receiving and transmitting the USB signal; the concentrator connecting layer is connected to the USB entity layer via a UTMI interface, has several downwards connecting interfaces and responds to the USB transaction of the system unit; and several functional connecting layers are connected to the downwards connecting interfaces via several UTMI interfaces.

The invention discloses a method with a phase selection function for protecting composite-sequence component voltages of a power transmission line. The method includes computing a real portion of a ratio of each fault-phase negative-sequence current to a zero-sequence current; dividing the real portion of the ratio of each fault-phase negative-sequence current to the zero-sequence current by an absolute value of the ratio to obtain a direction coefficient; computing a zero-sequence voltage at a protection setting range for the transmission line; computing an equivalent negative-sequence voltage at the protection setting range for the power transmission line; forming a composite-sequence component voltage protection criterion by the zero-sequence voltage at the protection setting range for the power transmission line, the equivalent negative-sequence voltage and the direction coefficients. The method has the advantages that relay protection for single-phase earth faults of the power transmission line is implemented owing to distribution characteristics of zero-sequence voltages and negative-sequence voltages along the power transmission line, influence of transition resistance on the performance of protection actions is eliminated in principle, and the performance of the actions is unaffected by load currents or fault positions.

Embodiments of the invention provide a method and system for machine failure prediction. The method comprises: identifying a plurality of basic memory depth values based on a composite sequence of machine failure history; ascertaining weight values for at least one of the identified basic memory depth values according to a pre-stored table which includes a plurality of mappings wherein each mapping relates a basic memory depth value to one set of weight values; and predicting a future failure using a Back Propagation Through Time (BPTT) trained Recurrent Neural Network (RNN) based on the ascertained weight values, wherein weight values related to a first basic memory depth value in the pre-stored table is ascertained based on a second set of weight values related to a second basic memory depth value which is less than the first basic memory depth value by a predetermined value.

The invention provides a production technology for a bamboo-wood composite building template. The production technology for the bamboo-wood composite building template comprises the following steps that step 1, bamboo curtains, eucalyptus planks and poplar wood pieces are dried in a drying room; step 2, the dried eucalyptus planks are sawn into rectangular wood pieces, the wood pieces are closely attached, no overlapping and gap exist, and the wood pieces are pieced together to form the eucalyptus planks through bonding threads; step 3, glue coating treatment is conducted on the pieced eucalyptus planks; step 4, the composite sequence is a poplar wood face layer, the eucalyptus plank, the bamboo curtain, the eucalyptus plank, the bamboo curtain, the eucalyptus plank and the poplar wood face layer, and the fiber directions of the eucalyptus planks are perpendicular to the fiber directions of the poplar wood face layers; step 5, the composite template is sent into a hydraulic machine to press; step 6, film coated paper impregnated with resin glue is laid on the pressed poplar wood face, and compression molding is conducted through a thermocompressor; step 7, after hot compression, edging and edge sealing of the periphery are conducted on the template. The production technology for the bamboo-wood composite building template adopts moso bamboo as a main material, the resources are rich, the price is cheap, and the production cost is low; the surface of the building template is flat and smooth, resin consumption is small, and the anti-bending and compressive strength are high.

The invention discloses a large-scale monitoring sensor network RAW regrouping realization and periodic transmission grouping method, which specifically comprises two parts: (1) online continuous RAWregrouping is realized based on a Gold sequence; in the association stage of the node and the AP, the AP allocates an independent Gold sequence to each associated node, and the AP transmits RAW packetinformation through a composite sequence in the beacon, thereby avoiding overhead and reassociation time caused by AID reallocation, and realizing the purpose of allocating the nodes with discontinuous AIDs into the same RAW group; (2) RAW grouping; the method aims at periodic data of a large-scale safety monitoring sensor network. The RAW regrouping algorithm capable of reducing the collision probability is designed, the problem of inter-group load imbalance existing in an original RAW mechanism is solved through three times of grouping, RAW grouping is conducted on periodic data of a large-scale safety monitoring sensor network, collision caused by random grouping is reduced, and the 802.11 ah network performance is improved.

The invention discloses an efficient method for synthesizing cDNA from RNA through reverse transcription. The cDNA is synthesized with plus stand RNA or mRNA serving as a template by using a reverse transcription primer under the action of a reverse transcriptase, wherein the 3' end of a target area section of the reverse transcription template is sequentially called a specific primer binding domain R1, a spacer domain S and a partial template fragment area R2; the reverse transcription composite sequence primer is combined by two deoxynucleotide segments containing template minus strand sequences and plus strand sequences respectively; and a P1 domain at the 3' end of the reverse transcription primer is a group of specific deoxynucleotide sequences complementary with the template specific primer binding domain R1, and a P2 domain at the 5' end of the reverse transcription primer is a group of specific deoxynucleotide sequences the same with the partial template fragment area R2.

Aspects of the present disclosure provide techniques for grouping demodulation reference signal (DMRS) sequences for uplink transmission without grant based on one or more of cross correlation of sequences, the cubic metric or peak-to-average power ratio (PAPR). In accordance with this technique, the power control for transmissions of DMRS can also be exploited to enhance sequence grouping. Features of the present disclosure may prepare a composite sequence that is generated by concatenating two base sequences. In this instance, the base station may provide UEs with a pool of base sequences. For transmission of DMRS, the UEs may select two base sequences that may be transmitted in two consecutive slots or two DMRS symbols in a slot. By allowing the UE to select two base sequences, the network may reduce the probability of a collision that may occur when two UEs select the same base sequence.

The invention relates to a method for acquiring asymmetrical short-circuit current DC components of a complex power system, and the method comprises the following steps of 1) respectively constructingcomposite sequence networks including a positive sequence network, a negative sequence network and a zero sequence network for calculating asymmetrical short-circuit current periodic components of the complex power system according to a fault point and a fault port, and increasing the reactance in an original branch of each sequence network to k times to form a positive sequence k network, a negative sequence k network and a zero sequence k network; 2) respectively acquiring an input impedance Z2sigma.N of the negative sequence network, an input impedance Z0sigma.N of the zero sequence network, an input impedance Z2sigma.k of the negative sequence k network and an input impedance Z0sigma.k of the zero sequence k network at the fault port; 3) calculating additional impedances under different types of short circuits, introducing the additional impedances into the complex power system, and simplifying the composite sequence networks to obtain a network simplified model; and 4) respectively calculating corresponding initial values of the DC components and decay time constants thereof for each type of asymmetric short circuit. Compared with the prior art, the method provided by the invention has the advantages of being suitable for a complex network, simple and accurate calculation, and the like.

Embodiments of the invention provide a method and system for solving a prediction problem. The computer-implemented method comprises: decomposing a target sequence associated with the prediction problem into a binary sequence group including at least one binary sequence, wherein each binary sequence in the group is generated based on a corresponding multiplier value; generating a plurality of elementary sequences based on each composite sequence in the binary sequence group; determining initial weights of each composite sequence based on average of weights of the corresponding elementary sequences; determining a binary prediction value for each binary sequence, wherein the binary prediction value for each composite sequence is determined by modelling each composite sequence using RNN based on the determined initial weights; and determining a real prediction value for the target sequence based on a product of the binary prediction value for each binary sequence and the corresponding multiplier value.

The invention relates to an asymmetric short circuit current DC component decaying time constant acquisition method. The method comprises the following steps: 1) according to the type of asymmetric short circuit fault happening to a power system, a 120 composite sequence network formed by a 1 sequence network, a 2 sequence network and a 0 sequence network is built correspondingly; 2) according to the connection relationship of the 120 composite sequence network, the decaying time constant of a DC component in the short circuit current is calculated. Compared with the prior art, the method has the advantages of simple modeling, high calculation precision, wide applicability and the like.

The invention discloses a multi-loop ground fault analysis method and device, electronic equipment and a storage medium. The method comprises the following steps: establishing a composite sequence network diagram of a fault through a symmetrical component method and a multi-port network theory; establishing a fault point loop current equation according to the composite sequence network diagram; establishing a fault boundary condition equation according to the voltage sequence component relationship of the fault point; and according to the fault point loop current equation and the fault boundary condition equation, solving each sequence current of the fault line and the zero sequence voltage of the fault point. According to the invention, the fault analysis of multi-loop line grounding is realized, the protection line can be configured and improved by calculating and analyzing the zero-sequence voltage of the fault point, and the multi-loop line complex fault in a microgrid can be detected more quickly.

A method and systems for developing a composite sequence for electrical power transmission and distribution equipment in a power system are provided. The system includes a sequencing generation circuitry to generate a composite sequence for electrical power transmission and distribution equipment according to a demographics sub-sequence, a utilization sub-sequence, a maintenance sub-sequence, a performance sub-sequence, a criticality sub-sequence and a condition sub-sequence. The system also includes a first sub-model to predict a future equipment sequence of the electrical power transmissionand distribution equipment in the power system and a second sub-model that generates the replacement control scheme for replacing utilities assets.

Embodiments of the invention provide machine learning method and system. The method comprises: generating a group of sub-sequences based on a target sequence including n basic memory depth values, the group of sub-sequences includes at least one subset of composite sequences, and each composite sequence in any subset is generated based on an equal number of consecutive basic memory depth values (BMDV); determining weights of each sub-sequence, wherein initial weights for a composite sequence generated based on m BMDV are determined based on average of weights of at least two sub-sequences each having an equal number of BMDV which is less than and closest to m; determining weights of the target sequence based on an average of weights of at least two sub-sequences each having an equal number of BMDV which is closest to n; and solving the prediction problem based on weights of the target sequence.