60 results about "Frequency factor" patented technology

The invention discloses a text feature quantification method based on comentropy, a text feature quantification device based on comentropy, a text classification method and a text classification device. The text feature quantification method comprises the following steps that: the weight of each feature word in a document is calculated according to the word frequency of feature words in a text document and the comentropy distributed on different text classes; meanwhile, the inter-class distribution entropy of the feature words is calculated in different modes according to the unbalance performance of the scale of each class of a text set; in addition, the inverse document frequency is introduced as required according to the distribution features of each feature word in the text set; local word frequency factors are properly reduced, so that the weight distribution of each feature word in the document is reasonable; and the feature differences of different classes of texts are sufficiently reflected by generated document feature vectors. The text feature quantification device and the text classification device disclosed by the invention have a plurality of options or parameters; and the optimum text classification effect can be achieved through regulation. The text feature quantification method has the advantages that the text classification accuracy is improved, and the performance on different text sets is stable.

The invention discloses an objective evaluation method of no-reference video quality weighted by key frame image quality. The method comprises the steps of: firstly, preliminarily selecting a key frame according to a movement intensity method weighed by a human eye interest, then dividing the preliminarily selected key frame into a scene switching type key frame and a non-scene switching type key frame by correlation analysis; evaluating image quality of the non-scene switching type key frame, subdividing the non-scene switching type key frame into a content change type key frame and a quality change type key frame according to an evaluation result; finally carrying out weighted summation calculation on single frame quality by using a duration factor and a deterioration frequency factor of the quality change type key frame, and obtaining the quality evaluation result of an entire video sequence. According to the objective evaluation method, the defect that then existing evaluating technology cannot be coincided with an actual subjective feeling; computation complexity can be reduced on the premise of ensuring the evaluating performance; the objective evaluation method is suitable for automatic evaluation of various video applications of an existing network, simple in operating steps and easy to integrate.

The invention discloses a method and device for controlling an electronic expansion valve. The method for controlling the electronic expansion valve includes the steps of a, periodically obtaining the current outdoor environment temperature and the current frequency of a compressor, obtaining a first adjusting range of the electronic expansion valve according to the adjustment range, corresponding to the preset outdoor environment temperature, of the electronic expansion valve, obtaining a second adjusting range of the electronic expansion valve according to the adjustment range, corresponding to the preset frequency of the compressor, of the electronic expansion valve, b, obtaining the intersection of the first adjusting range of the electronic expansion valve and the second adjusting range of the electronic expansion valve, taking the intersection as a final adjusting range of the electronic expansion valve, c, obtaining the variation trend of exhaust gas temperature, and correspondingly adjusting the electronic expansion valve within the final adjusting range of the electronic expansion valve according to the variation trend of exhaust gas temperature. According to the method and device for controlling the electronic expansion valve, the electronic expansion valve is adjusted fast and reasonably under the control of the outdoor environment temperature factor adjusting range and the compressor frequency factor adjusting range and on the basis that the electronic expansion valve is controlled by the exhaust gas temperature.

The invention relates to a self-adaptive enhancement algorithm of a weighted histogram of an infrared image, which is a self-adaptive infrared image enhancement algorithm having the capacity of frequency characteristic processing of a space domain method. An image is divided into a target information section, a background information section and a noise information section by analyzing the grayscale information of each pixel of an original image so as to self-adaptively obtain two frequency factors. The first frequency factor E(i, j) is firstly utilized to weight a histogram of the original image by maintaining the frequency information of a part of pixels and modifying the frequency information of other parts of pixels to suppress noise and useless information and magnify target information; subsequently, threshold value processing is carried out on the weighted histogram through an automatic generating platform so as to obtain a new histogram; then equalization processing is carried; and finally, the other frequency factor F(i, j) is utilized to fine adjust the grayscales of each pixel. When the self-adaptive enhancement algorithm is used for carrying out infrared image processing, an infrared image with good enhancement effect can be guaranteed, and meanwhile, compared with a conventional frequency domain processing method, the self-adaptive enhancement algorithm improves the processing speed.

The invention discloses a chi square statistic based self-adaption feature selection method and relates to the field of computer text data processing. Firstly, preprocessing of a training text set and a test text set is performed and comprises participle processing and stop word processing, then, self-adaption text feature selection based on chi square statistic is performed, a word frequency factor and interclass variance are defined and introduced into a CHI algorithm, an appropriate scaling factor is added for the CHI algorithm, finally, the scaling factor is automatically adjusted in combination of classical KNN algorithm evaluation indexes, improved CHI is adapted to different text corpora, and higher classification accuracy is guaranteed. An experimental result proves that by comparison with a conventional CHI method, the classification accuracy of a balanced corpus and a non-balanced corpus is improved.

The invention discloses a wind turbine MPPT control method with a turbulence frequency factor considered. The method includes the steps that based on a power curve adjusting manner of a shrinkage tracking interval, a functional relation of the optimal start rotating speed and three kinds of wind speed feature indexes including the average wind speed, the turbulence intensity and the turbulence frequency is established by the adoption of a response surface approximation model, and accordingly the MPPT method capable of more comprehensively making response to the turbulence wind condition changes so as to improve power signal feedback is proposed. According to the method, considering of the turbulence wind speed feature in the MPPT method is perfected, the MPPT performance of a wind turbine is further improved, and good adaptability is achieved for changing turbulence wind conditions.

The invention provides a feature selection and weight calculation method of an imbalance text set, and belongs to the field of text information processing. In order to solve the classification problem of imbalance text data, a feature selection and weight calculation method and system are provided. The category discrimination degree and the average word frequency factor are combined, the chi-squared statistic method is improved so as to conduct feature selection, meanwhile, a commonly-used feature weight calculation method is improved, and on the basis of the improvement, the TF-IDF weight calculation method is provided. The effect of the method on solving the imbalance data set problem is superior to that of a traditional feature selection method, and the method is effective and feasible in effectively improving the classification accuracy.

The invention intends to realize a high accuracy of some picoseconds in skew compensation as well as a downsized circuit scale. A phase shifter using analog circuits that allows a downsized circuit scale and a high-accuracy phase shifting is adopted in order to finely shift the phase between a clock signal and a data signal. The phase shifter passes the clock signal or the data signal through a low pass filter having a pass band not higher than the based frequency of the clock signal to extract the frequency factors not higher than the based frequency factors. After dividing the extracted signal into plural signals, the phase shifter inputs the clock signal or the data signal having the phase shifted to plural variable gain amplifiers. Next, the phase shifter inputs the outputs from the variable gain amplifiers to an adder or a subtracter, and inputs the signal after being added or subtracted to a limit amplifier to reshape it into a rectangular wave. Thus, by analogically adjusting the outputs from the variable gain amplifiers, the phase shifter shifts the phase of the input clock signal or data signal.

A method of calculating far extrapolation of a transient field of electromagnetic scattering through finite difference time domain includes the steps of 1 dividing an area to be calculated into a main field area and a scattering field area according to the connecting boundary; 2 setting an extrapolation boundary in the scattering field area, and extrapolating electric fields and magnetic fields on the extrapolation boundary to obtain a far field; 3 setting transient incident waves, and sequentially updating the electric fields and the magnetic fields at each time step until the electromagnetic field distribution becomes steady; 4 writing the far field into a product of frequency factors and integral factors, and performing inverse Fourier transform on the integral factors to obtain a time domain expression; 5 setting an integral factor far field time domain response array; 6 performing Fourier transform on integral factor far field time domain response to obtain integral factor far field frequency domain response; 7 using far field and incident wave frequency domain response to obtain RCS (Radar Cross Section) changes with frequency. The method of calculating far extrapolation of the transient field of electromagnetic scattering through finite difference time domain writes the far field into the form of the product of the frequency factors and the integral factors due to the fact that the forms of frequency-time transform and time-frequency transform of the integral factors are simple, thereby simplifying the calculation and improving the efficiency.

A universal series bus (USB) frequency synchronous apparatus using a start of frame (SOF) signal generated by a master device to mark a reference interval is disclosed. The frequency synchronizing apparatus includes a frequency divider, a counter unit with a default pulse number, an arithmetic unit, and an adjusting unit. The frequency divider divides a high frequency signal by a variable frequency factor to generate a lock frequency signal. The counter is used to detect a pulse number of the lock frequency signal at a reference interval and obtain a pulse difference between the default pulse number and the detected pulse number of the lock frequency signal.

The invention provides a method for extending semantic information of microblogs and selecting features thereof, belongs to the field of text information processing, and particularly relates to a method and a system for extending semantic information of microblogs and selecting features thereof. The method has the advantages that the method is used for extracting the features of the microblogs on the basis of modified chi-square statistics; the classification features of the information of the microblogs are extended at first, frequency factors are imported on the basis of the traditional chi-square statistics, and a process for selecting the features is modified; a novel process for modifying the chi-square statistics is based on the traditional feature item weight computation, weight computation results are modified, and accordingly the microblog information classification accuracy can be improved by the method.

The embodiment of the invention discloses a calculation method for the service life prediction of GIS (Geographic Information System) air-tight seal rubber. The method comprises the following steps that: S1: obtaining a preset empirical constant value as well as rubber aging time and a rubber aging performance retention rate under preset aging temperature during the preset empirical constant value, and calculating the aging performance retention rate under different aging time of the GIS air-tight seal rubber at the preset aging time during the preset empirical constant value; S2: through the calculation value of the aging performance retention rate and a preset value of the aging performance retention rate corresponding to the calculation value, calculating the fitted value of the preset empirical constant value, and carrying out iterative update on the fitted value to obtain the empirical constant value corresponding to a minimum fitted value; and S3: through the empirical constant value corresponding to the minimum fitted value and a linear fitting method, obtaining a reaction rate constant value at the preset aging temperature, obtaining the apparent activation energy and the frequency factor of rubber, obtaining the reaction rate constant value of the rubber at different aging temperature, and obtaining the rubber prediction service life.

The invention provides a type of de-disturbance and de-spread method and device, the method includes: (a) Digital base band data received is stored; (b) using conjugated disturbing code to de-disturbance the store the data; (c) de-spread the data which is after de-disturbance, data in code class is decomposed into characters by data code transmission; (d) Corresponding data is obtained based on position of multi-pathway and/or expanding frequency factor. The device includes: data buffer unit, conjugated disturbing code generating unit, de-disturbance unit, de-spread unit, data taking unit, the device and method in the invention fits for de-disturbance de-spread whose expanding frequency factor is 2n, and simplifies the circuit structure of receiver, increases the performance of receiver.

The embodiment of the invention discloses a bus route priority determination method and device, and a bus transfer route ranking method and device. The objective of the invention is to solve a problemthat a current bus route priority determination method is bad in accuracy. The bus route priority determination method comprises: receiving location data sent by a user terminal; generating bus running track data corresponding to bus routes according to the location data; for each bus route, employing time information and position information of the location data in the bus running track data corresponding to each bus route, and determining a running speed and a departure frequency of buses on each bus route in a set time section; and employing the determined running speed and departure frequency to determine time priority of each bus route in the set time section. a running speed factor which influence a riding running time is considered, a departure frequency factor which influence a waiting time is also considered, and therefore the accuracy of the determined priority of each bus route in the set time section is very high.

The phase locked loop (PLL) of the invention comprises a first divider (DIV1), a second divider (DIV2), a phase detection means (PFD) and an oscillator means (VCO) connected in a PLL loop configuration. The first divider (DIV1) and the second divider (DIV2) each have at least two different selectable frequency factors (a, b; c, d). A control means (CTPL) switches between pairs of frequency division factors selected respectively from both dividers (DIV1, DIV2) according to a predetermined switching pattern (Z). The usage of at least two different pairs of frequency division factors in the dividers (DIV1, DIV2) allows a high phase resolution, a fast tracking speed and a fine adjustment of the frequency/phase of the output signal of the voltage-controlled oscillator (VCO) in steps of ppm.

The invention relates to a method for evaluating suppression effect of a smoke suppressor on a release process of an asphalt thermal decomposition product, belongs to the technical field of asphalt material safety, and solves the problem that an existing asphalt smoke suppression performance evaluation method is inaccurate. According to a technical scheme combining DSC-MS (differential scanning calorimetry-mass spectrometry) and thermal analysis kinetics theoretical calculation, the method includes: firstly, testing asphalt with a DSC-MS analyzer to acquire data such as a DSC curve and a continuous mass spectrogram; secondly, analyzing the continuous mass spectrogram, understanding rules of variation, with temperature, of components and concentration of volatile matters produced during asphalt thermal decomposition, and evaluating the smoke suppression effect of the smoke suppressor on the asphalt; thirdly, determining a reaction mechanism function and a conversion rate function of the asphalt thermal decomposition process, solving thermal analysis kinetics parameter activation energy E and a frequency factor A, and quantitatively evaluating the smoke suppression effect of the smoke suppressor on the asphalt; finally, comparing E and A of matrix asphalt with those of smoke suppression type asphalt, and combining a mass spectrogram analysis result to more accurately evaluate the suppression effect of the smoke suppressor on the asphalt release thermal decomposition product.

The invention relates to a text keyword weight calculation method integrating a word position factor and a word frequency factor, and the method comprises the following specific steps of (1) opening asingle text, and recombining paragraphs of the text to form a new text; (2) preprocessing the new text, including word segmentation and stop word removal, and constructing a candidate keyword matrixby taking the rest words as candidate keywords; (3) calculating the weight of each candidate keyword by using the position factors and the word frequency factors of the harmonious series comprehensivewords; and (4) outputting the weight corresponding to each candidate keyword. According to the method, the text structure information is fully utilized, that is, word position factors and word frequency factors in the text are fused, and the weight of a keyword can be calculated only for a single text on the premise of not depending on a field text set. Compared with TFIDF and TEXTRANK, the method has the advantages that the operation is simple and easy, the effect is good, and the functions of the TFIDF and the TEXTRANK can be realized.

A method and system for estimating a frequency offset between a receiver and a transmitter, including the steps of, or means for: (a) receiving a first signal from said transmitter and demodulating the first signal; (b) performing a frequency shift on said first signal by a predetermined frequency factor to generate a second signal; (c) filtering each of said first and second signals; (d) determining the power of each of the filtered first and second signals; (e) determining an upper corner frequency value of the first signal using the power of the filtered first and second signals; (f) determining a lower corner frequency of the first signal using the determined power of the filtered first and second signals; and (g) determining a frequency offset value based on said upper corner frequency value and said lower corner frequency value.

The invention discloses a method and a system for establishing an oil shale in-situ conversion temperature, time and conversion ratio plate. The method comprises the following steps that: selecting anoil shale sample from an oil shale pseudoproduction area, and adopting a rock pyrolysis analyzer to perform an experiment on the oil shale sample; according to an experiment result, obtaining relational data among pyrolysis activation energy, a conversion ratio and a frequency factor; and on the basis of the relational data, establishing a relational plate between the reciprocal and the time logarithm of the oil shale in-situ conversion temperature when the conversion ratio is different numerical values. By use of the method, what temperature and when a certain conversion ratio degree can beachieved for the oil shale in-situ conversion in a mining zone can be quickly learnt, and an important parameter is provided for engineering decision and cost accounting.

The invention relates to a social networking site user Chinese remark name system recommendation method applied to social networking sites. The method includes aiming to arrangement of friend remark names, considering the length factors, composition factors and word frequency factors of net names comprehensively, adopting a weighting computation method, and implementing system intelligent recommendation effectively. The method is adaptive to the situation of large amount of users' net name data, the situation of one user owning different net names and the situation of small amount of one user's net name data.

The invention discloses a hydrocarbon detection method based on a complex domain matching pursuit algorithm. The hydrocarbon detection method comprises a first step of based on the complex domain matching pursuit algorithm, searching for an optimal matching scale factor and a frequency factor by using a variable-step jumping search algorithm, and then calculating to obtain optimal matching decomposition of a seismic channel; a second step of based on the optimal matching decomposition, calculating to obtain a time-frequency spectrum by combining Wigner distribution and an An module value; and a third step of obtaining oil and gas monitoring data of a sampling point based on frequency variation features of the obtained time-frequency spectrum. The invention achieves the complex domain quick matching pursuit algorithm through the variable-step jumping search algorithm and an improvement algorithm of the time-frequency spectrum, the hydrocarbon detection method can be used for quickly and efficiently performing hydrocarbon detection processing while ensuring the calculation accuracy, thereby greatly saving the calculation time, and the invention has a high practical application value.

The invention provides a data true value discrimination and deduction method for a power communication system based on instable frequency distribution and frequency factor learning, and the method comprises the steps: firstly unifying the format of multi-source heterogeneous data in the power communication system through the frequency of the heterogeneous data; secondly unifying the formats of alldata in the power communication system into an instable frequency; thirdly carrying out the machine feature learning through a frequency factor learning function; fourthly carrying out the parameteroptimization solving of the frequency learning function through two label forms, and obtaining a prediction function; fourthly carrying out the learning and rule analysis of the collected mass monitoring data in the power communication system through a set true value discrimination method and the prediction function, enabling the distribution of instable frequency to point to an abnormality in thepower communication system, and judging the true value of data. Through the utilization of historical data, the method achieves the automatic locating of abnormal data and the compensation for the true value reasoning, so as to improve the data quality of the power communication system.

The invention discloses a carrier control method and a system based on a multi-carrier base station. The method makes subsequent carrier frequency collection of the multi-carrier base station meet the following conditions: any carrier frequency factor in the collection should not be included in a third-order inter-modulation frequency collection generated from the carrier frequency collection; the system includes: a carrier frequency collection generation module used to generate the multi-carrier base station which allows the subsequent carrier frequency collection; a third-order inter-modulation frequency collection generation module used to generate the third-order inter-modulation frequency collection according to the carrier frequency collection generated from the carrier frequency collection generation module. The invention can lower or eliminate the inter-band disturbance of the third-order inter-modulation generated by BTS in transmitting a plurality of carrier frequencies, thus reducing or removing the impact on system capacity and coverage and further enhancing the wireless resource utilization rate of air interfaces.