75results about How to "Calculation is slow" patented technology

The invention discloses a fast decoupled flow calculation method for power systems, which comprises the following steps of: inputting original data and initializing voltage; forming an admittance matrix; forming correction equation coefficient matrixes B' and B'' and performing factor table decomposition; performing P-theta iteration, and correcting a voltage phase angle; performing Q-V iteration, and correcting voltage amplitude; judging whether the iteration is converged; and calculating node power and branch power. The method requires that the P-theta iteration and the Q-V iteration are all converged in the same iteration and the iteration process is finished, so that the algorithm frame is simpler, and the flow is clearer. The sparse matrix technology is not adopted, so the matrix elements are convenient to access and calculate, and the programming is simple; the correction equation coefficient matrixes are stored according to n order, number change of nodes is avoided, and the programming difficulty is reduced; and the calculation amount is reduced through reasonable logic judgment, the calculation speed is obviously improved and the requirement of scientific research can be completely met. The fast decoupled flow calculation method also can process power systems with a plurality of balance nodes.

The invention belongs to the technical field of the Internet of things, and discloses a lightweight device authentication and shared key negotiation method based on an Internet-of-things platform. The method includes the following steps: a gateway device side sends a network access request message to a server side, and the server side queries whether there is the gateway device in a database according to a gateway number which can uniquely identify gateway identity information in order to judge the legitimacy of the gateway identity; the server side authenticates the legitimacy of the gateway device, and issues a shared key negotiation request to the gateway device side, and through two encryption and decryption operations, the gateway device side obtains one half of a shared key generated by the server side; after getting the half of the shared key, the gateway device side randomly generates the other half of the shared key, uses a public key of the server side to encrypt the complete shared key, and sends the shared key to the server side; and the server side uses a private key to decrypt cipher text information to get the shared key, and sends the shared key to the network device side to confirm the success of key negotiation. The security of equipment authentication, shared key and data information is ensured.

Semantic Search Engine using Lexical Functions and Meaning-Text Criteria, that outputs a response (R) as the result of a semantic matching process consisting in comparing a natural language query (Q) with a plurality of contents (C), formed of phrases or expressions obtained from a contents' database (6), and selecting the response (R) as being the contents corresponding to the comparison having a best semantic matching degree. It involves the transformation of the contents (C) and the query in individual words or groups of tokenized words (W1, W2), which are transformed in its turn into semantic representations (LSC1, LSC2) thereof, by applying the rules of Meaning Text Theory and through Lexical Functions, the said semantic representations (LSC1, LSC2) consisting each of a couple formed of a lemma (L) plus a semantic category (SC).

In a circuit simulation step, a cell transistor level net list is input, the slew of an input signal waveform and the magnitude of a load capacitance connected to a cell output terminal are varied for each cell, to perform a circuit simulation of each cell for obtaining an output signal waveform. Next, in a dependence table generation step, the dependence of the output signal waveform slew upon the input slew rate and the load capacitance is calculated for each cell, the dependence thus calculated is compared with a predetermined threshold level, and according to the dependence level, a delay calculation expression with consideration taken to the delay of signal propagation between the cell input and output terminals and another without such consideration are selectively used. Accordingly, the delay times of the cells forming a semiconductor integrated circuit can be calculated at high accuracy and at high processing speed.

The invention relates to an object volume measuring method. The method comprises the steps of acquiring a depth image of an object to be measured; performing rough positioning on the object to be measured according to the depth image, and obtaining an edge contour region of the object to be measured; expanding the edge contour region to obtain an expanded region, wherein the expanded region corresponds to the support surface of the object to be measured; acquiring the length, width and height of the object to be measured according to the edge contour region and the expanding region; and calculating the volume of the object to be measured by using the length, the width and the height. According to the object volume measuring method, the volume of the object to be measured can be rapidly andaccurately measured, so that the automation of a logistics packing process is facilitated.

The invention relates to a wind turbine blade comprising one or more electric powered modules. The modules have power supply means converting an energy source to electrical power for said one or more modules, wherein said energy source is light beams transmitted to the power supply means in the blade structure and/or interior from an external light source. The invention also relates to wind turbine and a method for manufacturing a wind turbine blade.

A delay calculation apparatus is provided for delay calculation of a structured ASIC in which a clock circuit is integrated within a master slice. The delay calculation apparatus is composed of a storage unit storing a clock circuit delay library containing clock circuit delay data obtained by delay calculation of a clock circuit, and a delay calculation section performing delay calculation of a structured ASIC incorporating the clock circuit to thereby generate delay calculation result data of the structured ASIC. The delay calculation section is designed to obtain at least a portion of the clock circuit delay data from the clock circuit delay library, and to merge the obtained portion of the clock circuit delay data into the delay calculation result data.

The invention discloses a double-end distance measurement method for improving wavelet transform based on windowing. The double-end distance measurement method comprises the following steps of: 1, sampling, namely sampling a failed traveling wave current signal f(t) received by the end m of a bus, and converting the failed traveling wave current signal f(t) into a dispersion function f(n delta t); 2, windowing, namely multiplying a dispersed time sequence f(n delta t) with a window function wN(t); 3, cracking for improving wavelet transform, namely partitioning a signal [fN(k), k belongs to Z] into an even-numbered sequence fe(k) and an odd-numbered sequence fo(k) which are related with each other; 4, forecasting for improving wavelet transform, namely forecasting the odd-numbered sequence fo(k) by the even-numbered sequence fe(k), and defining a forecasting error as a detail signal; 5, updating for improving the wavelet transform; 6, searching a modulus maximum from the detail signal, wherein a transverse coordinate corresponding to the modulus maximum is a moment when a wave head reaches the end m; 7, searching the moment when the wave head reaches the end m from the traveling wave signal at the end n of the bus; and 8, calculating a distance from a failed point to the end m of the bus. According to the double-end distance measurement method, the distance measurement precision can be improved, and the calculation speed can be further increased, so that the calculation time and the time for finding the fault point are shortened.

The invention provides a method for extracting and verifying a latter interconnection delay model. The method comprises the steps of: designing a discrete interconnection testing structure and a circuit level interconnection testing structure according to the process information of an integrated circuit; carrying out an interconnection delay parameter test; extracting the three-dimensional model parameters of the discrete interconnection testing structure by using a three-dimensional parasitic parameter extracting software, and calibrating the extracting results of the wafer testing result three-dimensional parameter extracting software; calibrating a simulation result of the three-dimensional parameter extracting software through the extracting result of a quasi-three-dimensional parameter extracting software; and finally, extracting the parameters of the whole circuit layout by using the quasi-three-dimensional parameter extracting software so that the precision of the extracted parameters can be compatible with the calculating speed of the parameters. The invention integrates the advantages of high precision of the three-dimensional parameter extracting software and higher calculation speed and fewer resource consumption of the quasi-three-dimensional parameter extracting software.

The invention discloses a multi-view camera-based bridge defect detecting device and a detection image splicing method. The bridge defect detecting device is an image collecting part and comprises: abridge detecting vehicle main body, a cross arm, a first hydraulic oil cylinder, a first connecting bracket, a second hydraulic oil cylinder, a longitudinal arm and a collecting mechanism assembly. The detection image spicing method comprises the steps of in an image processing process, carrying out feature extraction on collected images; matching by using a nearest neighbor algorithm; carrying out feature point screening and purifying; eliminating splicing seams appearing at splicing places due to uneven illumination by using a Lab fusion method; and splicing the images to obtain an overall image of the bottom of a bridge. The bridge defect detecting device of the invention has the advantages that the image of the bottom surface of the bridge can be more quickly and accurately obtained and automatic detection can be realized. The image splicing method disclosed by the invention has the advantages that when the detection images are processed, the accuracy of the detected data can be high; the detection efficiency is high; and the safety hazard can be eliminated at the same time.

An image processing system can quickly calculate a motion vector. The image processing system includes: a characteristic region detecting section that detects a characteristic region from each of a plurality of moving image constituting images included in a moving image; a characteristic region identifying section that identifies characteristic regions having high correlation in the plurality of moving image constituting images; a position difference calculating section that calculates a difference in position between the characteristic regions having high correlation identified by the characteristic region identifying section; a search region determining section that determines a narrower motion vector search region when a magnitude of the difference in position is smaller; and a compression section that compresses the moving image using a motion vector calculated by searching the motion vector search region determined by the search region determining section.

The invention discloses a detection system for an accurate position of a rotor of a large spliced arc motor and a detection method of the detection system. A driving motor of a large astronomical telescope adopts the spliced arc motor and a photoelectric encoder is arranged on the rotor of the spliced arc motor. The detection system is characterized in that the photoelectric encoder is an incremental photoelectric encoder provided with a plurality of reference points; output of the incremental photoelectric encoder provided with the reference points is photoelectrically coupled and isolated; signal power is buffered by a line driver; and a rotor position signal is transmitted to a relevant port of a DSP (digital signal processor) after conversion. The detection system and the detection method have the benefits that the photoelectric encoder provided with the reference points can be applied to the spliced arc motor in any size for detection of a position of a rotor pole, and the corresponding reference points can be selected according to pole pairs of the rotor, so that rotor position calculation is simplified, the controlled calculation speed is saved, and a purpose of rapidly, accurately and simply detecting the position of the rotor pole is achieved.

The work guidance unit of a work procedure guidance system calculates, using the data in a work database, the total standard man-hour and the removal/attachment procedures up to the removal/attachment of a designated part. Then, among the plurality of calculated removal/attachment procedures, guidance is provided for the removal/attachment procedure requiring the at least standard man-hours up to the removal/attachment of the aforementioned part.

A system and method for volume rendering a light field, wherein the light field data is subjected to a layering scheme introducing a partitioning of the hogels into subsets. Each subset corresponding to a sub-volume of the layer volume, corresponds to the sub-region of the layer. Novel partitioning of the data combined with an efficient local memory caching technique, plenoptic downsampling strategies to reduce memory bandwidth requirements and volume rendering algorithm to produce a rendered light field image. A reduction in the total number of samples required can be obtained while still maintaining the quality of the resulting image. A method is also provided to order memory accesses aligned with ray calculations in order to maximize access coherency. Real-time layered scene decomposition can be combined with surface rendering method to create a hybrid real-time rendering method that supports rendering of scenes containing superimposed volumes and surfaces.

The invention relates to an apparatus supporting an acquisition of a received code modulated signal by determining the correlation between the received code modulated signal and an available replica code sequence at different code phases. It is proposed that the apparatus comprises a first acquisition engine for selecting code phases which are good candidates for being the code phase at which a received code modulated signal and an available replica code sequence have the highest correlation. The apparatus further comprises a second acquisition engine for performing a refined comparison between a received code modulated signal and an available replica code sequence for each code phase selected by the first acquisition engine. The invention relates equally to a corresponding method and to a system comprising such an apparatus and a network.

The invention discloses an electrical source transient electromagnetic electric field response imaging method, and belongs to the technical field of transient electromagnetic geophysical exploration method. The aim is to solve the bottleneck problem encountered in the explanation of the precision aspect when transient electromagnetic response is further increased using the traditional instant variable electromagnetic fast imaging method and based on the minimum least squares retrieval method. The electrical source transient electromagnetic electric field response imaging method comprises the steps that 1, the virtual wavelet analytical solutions of the electrical source instant variable electromagnetic field response are derived; 2, a virtual wavelet numerical solution method is obtained; 3, a velocity analysis imaging method of the electrical source transient electromagnetic field response is obtained. The imaging method is based on the mathematical integral transformation between the diffusion field and the wave field, the calculation amount is small and the calculation speed is fast; the method provides a foundation for the elaborated interpretation of the wave field of transient electromagnetic response.

In a method as well as a device to process measurement data that are composed of a number of data sets with a number of independent random samples originating via temporally successive measurements, for a comparison of the time curve of each acquired random sample with the time curve of a model function using the general linear model, the required calculations are implemented data set-by-data set in a series of the data sets originating from the temporal sequence of measurements, and stored as an intermediate result, with the intermediate results of the directly preceding data set being updated with the new calculations. The comparison can be calculated efficiently and quickly, with a saving of storage space.

A modulation process for a digital transmission system having an error correcting code and determination of the number of bits to load on a transmission channel. The process judiciously associates a coder for introducing redundancy to the binary information, an interleaver for suppression the correlation to the encoded information and a labeling of the same based on a GRAY type coding in order to associate the said binary information with points of a constellation which is selected among a predetermined set of constellations. The process achieves a precise determination of the order and size of the constellation to utilize and, therefore, the computation of the bit loading as a function of the signal to noise ratio measured in reception and as a function of the bit error rate P_bit at the output of the receiver. The process is well adapted to the Multi Tone transmission system, and to the use of turbo codes.

The invention relates to a phylogenetic tree construction method based on a sequence pattern mining algorithm. The phylogenetic tree construction method based on the sequence pattern mining algorithmcomprises the following steps: mining a specific pattern which is hidden in a sequence set and can be used for measuring sequence similarity to obtain an initial pattern set; filtering an unclosed frequent pattern in the initial patter set to acquire an optimized pattern set capable of representing the sequence set; and constructing a patter vector set and calculating the distance between numericvectors so as to construct a distance matrix for producing a phylogenetic tree. The sequence pattern which frequently appears in the sequence set is extracted by a sequence patter mining algorithm, the sequence set is converted into binary system by the filtered pattern set or the distance matrix is calculated in the form of giving weight information to the pattern vector set, and then the phylogenetic tree is constructed. For the large-scale and low-similarity sequence set, the more representative pattern in the sequence set can be mined by utilizing a pattern growth strategy, so that the extraction of a redundancy pattern which is useless for measuring sequence similarity is voided and measurement on the similarity among the sequences within the global range is optimized.

The invention discloses an anti-interference static contact angle calculation method in the technical field of material performance test. The method comprises the following steps: acquiring a droplet image; and extracting a droplet edge, and selecting an optimal contact angle algorithm according to the actual droplet volume, a contact angle value predicted by a user and a critical droplet volume value so to calculate to work out the static contact angle of droplets. Since the optimal static contact angle algorithm is selected according to actual conditions, the method has high interference resistance and ensures both high calculation accuracy and high calculation speed; moreover, the method can aim at different droplet volumes and contact angles and is wide in application range.

A system for verifying signal propagation delays of circuit traces of a printed circuit board (PCB) layout includes a computer (1). The computer includes: a setting module (10) for setting a minimum propagation delay and a maximum propagation delay for a trace to be verified, and making a selection regarding whether to calculate a propagation delay of a lead wire connected with the trace; a selecting module (11) for selecting a segment from a segment set of the trace; a calculating module (12) for calculating a propagation delay of the segment, the trace and the lead wire, and a total propagation delay; and a determining module (13) for determining whether all segments of the trace have been calculated, and whether the total propagation delay is between the minimum propagation delay and the maximum propagation delay. A related method is also disclosed.

The invention discloses a real-time calculation system and method for traffic fees of differentiated highway toll collection. The system comprises a national toll highway networking settlement management center, a provincial networking settlement management center and edge calculation units arranged at a toll station and an ETC door frame. The national toll road networking settlement management center and the provincial networking settlement management center are used for uniformly generating, adjusting and maintaining a road network data structure table COO and transmitting COO data to the edge computing unit in real time through the communication system; and the edge calculation unit adopts a parallel heterogeneous shortest path finding method to calculate the minimum cost of the lost road section recorded by the toll passing medium in real time. The method can meet the real-time requirements of differential charging and charging under special conditions under the increasingly complex highway network and differential charging conditions, and further optimizes the charging work of the highway after the provincial toll station is canceled.