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73 results about "Interval method" patented technology

Interval arithmetic, interval mathematics, interval analysis, or interval computation, is a method developed by mathematicians since the 1950s and 1960s, as an approach to putting bounds on rounding errors and measurement errors in mathematical computation and thus developing numerical methods that yield reliable results.

Algorithm for the automatic determination of optimal AV an VV intervals

Methods and devices for determining optimal Atrial to Ventricular (AV) pacing intervals and Ventricular to Ventricular (VV) delay intervals in order to optimize cardiac output. Impedance, preferably sub-threshold impedance, is measured across the heart at selected cardiac cycle times as a measure of chamber expansion or contraction. One embodiment measures impedance over a long AV interval to obtain the minimum impedance, indicative of maximum ventricular expansion, in order to set the AV interval. Another embodiment measures impedance change over a cycle and varies the AV pace interval in a binary search to converge on the AV interval causing maximum impedance change indicative of maximum ventricular output. Another method varies the right ventricle to left ventricle (VV) interval to converge on an impedance maximum indicative of minimum cardiac volume at end systole. Another embodiment varies the VV interval to maximize impedance change.
Owner:MEDTRONIC INC

Cardiac pacing response classification using an adaptable classification interval

Methods and systems involve the formation of a classification interval used for sensing a cardiac signal following a pacing pulse to determine a cardiac response to pacing. One or more cardiac signals associated with a type of cardiac pacing response are sensed. The timing of at least one feature of the cardiac signal may be used to define an initial cardiac response classification interval. The classification interval is adapted based on the variability of the timing of the feature. The classification interval may be adapted using a predetermined number of additional cardiac signals or until a predetermined stability criterion is achieved.
Owner:CARDIAC PACEMAKERS INC

Train tracking interval real-time early warning system based on CTC (central traffic control) and early warning method

The invention discloses a train tracking interval real-time early warning system based on CTC (central traffic control) and an early warning method, which belong to the field of high-speed train safety control technology. A dispatching center subsystem early warning server of the system consists of an early warning server and a dispatching command output unit, an application server of the dispatching center subsystem consists of a train number tracking unit and a wireless checking unit, vehicular equipment comprises a wireless train number vehicular encoder, and the system comprises a wireless train number decoder. The method includes acquiring a train number from decoded train comprehensive information by the aid of the wireless checking unit, comparing the acquired train number with a train number obtained by the train number tracking unit, and acquiring an accurate and reliable train number; and computing tracking intervals of a train by the aid of the early warning server, and controlling the dispatching command output unit to output control instruction according to a computation result. The train tracking interval real-time early warning system based on CTC and the early warning method form double channels with an ATP (automatic train protection) computation tracking interval method, a monitoring effect for a train tracking interval ATP control effect is realized, and integral safety of a train control system is improved.
Owner:BEIJING JIAOTONG UNIV

Exponential echo and noise reduction in silence intervals

Method for the reduction of echo and / or noise signals in TK systems for the transmission of useful acoustic signals, in which, when a silence interval is present, the distorted useful signal is modified by a time-dependent control signal ao(t) or by a control signal ao(k) cycled in the rhythm of a scan rate fT=1 / T. The control signal ao(k) is varied in such manner that, during the presence of speech signals in the useful signals, the amplitude of the control signal ao(k) is set to a predetermined constant value co and, when a silence interval begins, the amplitude of the control signal ao(k) is reduced continuously from one sample value to the next in accordance with the recurrence formula ao(k+1)=ao(k).β with β<1. After the end of the silence interval, ao(k) is again set equal to co.
Owner:WSOU INVESTMENTS LLC

Apparatus and method for ranging

The measurement of the distance or / and the relative velocity with fast response is to be achieved while the accuracy of measurement of the distance to an object in close range is maintained. A calculation-execution determination section determines whether or not an object is present within a predetermined range from the strength of a two-frequency Doppler signal sent from an A / D converting section and past calculated distance sent from a calculation selecting section. If the object is outside the predetermined range, the distance calculated by an FFT-method calculating section is output from a calculation output section via an calculation selecting section. If the object is within the predetermined range, one of the distance calculated by a time-interval-method calculating section and the distance calculated by the FFT-method calculating section is selected by the calculation selecting section, and is output from the calculation output section. The invention can be applied to a fast response system such as a precrash system.
Owner:ORMON CORP

Traffic flow change trend extraction method based on floating car data

ActiveCN103810849AThe changing trend of traffic flow is highlightedClear referencesDetection of traffic movementSpecial data processing applicationsInterval methodGranularity
The invention discloses a traffic flow change trend extraction method based on floating car data and belongs to the technical field of intelligent transportation. The traffic flow change trend extraction method based on the floating car data comprises obtaining historical floating car data of at least three mouths of a road chain and classifying the data according to feature days; performing denoising and smoothing on the historical floating car data; dividing the historical floating car data of every feature days into at least one time frame according to the change trend of a morning peak and an evening peak; performing preliminary clustering on the classified historical floating car data through a K-means clustering method; further clustering the historical floating car data through a controlled interval method or a two-value method according to a coarse granularity expression of traffic information. The traffic flow change trend extraction method based on the floating car data combines the coarse granularity expression of the traffic information, further merges the traffic flow trends on the basis of a K-means clustering method, enables the traffic flow change trend to be more salient, thereby providing more crystal clear references for traffic flow prediction, route planning and induction, route planning and the like.
Owner:北京千方城市信息科技有限公司

Method for automatically adjusting multi-strategy urban train operation

The invention is concerned with the automatic adjusting method for multi-strategy train, the characteristics is: processes the real-time monitoring to the operation state of the train, finds the operation abnormal of the train, operates by the following ways according to the deviation condition when the operation time of one or more trains is deviation with the timetable: the single adjustment method, the group adjustment method, the equal interval method or the timetable excursion method; returns the normal operation finally.
Owner:NANJING NRIET IND CORP

Modal intervals-based high-speed train bogie fault diagnosis method

InactiveCN104502126AImprove reliabilityResolving Numerical Uncertainty ProblemsMachine part testingRailway vehicle testingBogieFeature extraction
A modal intervals-based high-speed train bogie fault diagnosis method includes the steps of 1, acquiring a high-speed train bogie vibration signal; 2, preprocessing the high-speed train bogie vibration signal; 3, subjecting the high-speed train bogie vibration signal to modal interval valuing; 4, subjecting the high-speed train bogie vibration signal to EMD (experience modal decomposition); 5, subjecting the high-speed train bogie vibration signal to feature extraction; 6, constructing and training an initial interval neural network model; and 7, performing high-speed train bogie fault diagnosis. Uncertainty in bogie vibration signals is processed by the modal interval method, and high-speed train bogie faults are diagnosed by a classified recognition method of the interval neural network model; the uncertainty in the high-speed train bogie fault diagnosis is handled by the modal interval method, and reliability of fault diagnosis results is greatly improved. The method is applicable to the fault diagnosis for high-speed train bogies.
Owner:EAST CHINA JIAOTONG UNIVERSITY

Vehicle suspension leaf spring frequency domain fatigue analysis method

The present invention discloses a vehicle suspension leaf spring frequency domain fatigue analysis method. The method is characterized by comprising: targeted at a pre-stress and a large transformation effect of a leaf spring, establishing a leaf spring geometric model in a free state and importing the leaf spring geometric model into finite element software for analysis; by applying a displacement constraint on a plate spring seat and applying a theoretical axle load on front and rear lugs, obtaining stress distribution in an operating state of the leaf spring, so as to obtain a leaf spring modality result file; by acquiring experimental data of a vehicle on a durability test road, obtaining a power spectrum density of a relative acceleration; and targeted at the obtained leaf spring modality result file, by using the obtained power spectrum density as a load input, executing a random vibration analysis in the finite element software, extracting a dynamic response result of a virtual prototype under a random excitation and estimating fatigue performance of the leaf spring on the durability test road according to a Gaussian three interval method. The method disclosed by the present invention is accurate in result and high in operation efficiency.
Owner:HEFEI UNIV OF TECH

Box separation method based on k-means clustering

The invention discloses a box separation method based on k-means clustering. The box separation method comprises the following steps that continuous variables are preprocessed; normalization processing is carried out on the preprocessed data, a k-means clustering algorithm is applied on the data obtained after the normalization processing is carried out to divide the data into a plurality of sections; the equal interval method is adopted for setting the initial center of the k-means clustering algorithm to obtain clustering centers; after the clustering centers are obtained, the midpoint of the adjacent clustering centers is used as a classification division point, each object is added into the closest class, and therefore the data are divided into the multiple sections; each clustering center is calculated again, then the data are divided again until each clustering center does not change any more, and the final clustering result is obtained. According to the box separation method, the technical problem that errors are likely to be caused for a data set with the obvious data density distribution bias according to an existing box separation method is solved, the k-means clustering algorithm does not select the initial center randomly any more, and the data separation result is accurate.
Owner:GUANGDONG POWER GRID CO LTD INFORMATION CENT

Video-based non-supervision abnormal event real-time detection method

The invention provides a video-based non-supervision abnormal event real-time detection method. Specific to the aims of reducing the quantity of inter-frame feature points and lowering the complexity in calculation of the feature points at the same time, the feature points are detected with an interval method, namely, a video is segmented, the feature points are detected on a first frame, and only tracking is required subsequently. The calculation amount of a tracking method is small relatively, so that the calculation complexity is lowered greatly. At the end of one segment of video, the feature points are detected once again. After the feature points of each video segment are obtained, direction, speed and location histograms of motion feature points are extracted and connected in series to serve as features of the video segments. Then, the features are subjected to Gaussian mixture modeling and updated in real time to obtain the probability of abnormal events in order to judge whether any abnormal event occurs or not. Thus, the abnormal events can be detected in real time.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA

Multiple request intervals

Methods and apparatuses are presented for communicating using a shared communication medium. A request is sent over the shared communication medium. The shared communication medium is organized to include a request signal space and a scheduled transmission signal space. The request signal space includes a plurality of request segments each having a different location within the request signal space. The scheduled transmission signal space includes a plurality of scheduled transmission segments each having a different location within the scheduled transmission signal space. The request occupies more than one request segment. Each of the more than one request segments is randomly selected by the first node. An assignment is received assigning the request to a transmission opportunity in the scheduled transmission signal space. The assignment is made in response to detecting at least one of the more than one request segments. A data transmission is sent using the assigned transmission opportunity.
Owner:VIASAT INC

Screen coding method under low code rate

InactiveCN1859571ASave bandwidthFacilitate low bit rate transmissionDigital video signal modificationPattern recognitionInterval method
The present invention refers to low code rate screen encoding method, belonging to video coding decoding technology field. It contains collecting computer screen picture; uniformly dividing screen picture into plurality of image pieces; comparing with previous frame screen picture corresponded piece; according to comparative result determining whether to make space domain resolution ratio reducing and encoding to current frame, if encoding then adopting time domain self adaptation key frame interval method to determine encoding as key frame or non-key frame; respectively processing mouse messages and image data, adopting destructive and non destructive encoding adjoined encoding method to image data. The present invention is suitable for low code rate videoconference, tele education, and long-range control etc.
Owner:SHANGHAI JIAO TONG UNIV

Methods For Regulating Flow In Multi-Zone Intervals

Methods of regulating flow in a hydrocarbon well include identifying at least two dissimilar zones in an interval of a well, perforating a well completion in the interval according to a limited-entry perforation strategy, and re-perforating the well completion in the interval according to a re-perforating strategy. The limited-entry perforation strategy is adapted to produce a plurality of limited-entry perforations. The limited-entry perforation strategy varies the perforations within the interval based at least in part on dissimilarities between the at least two dissimilar zones. The re-perforation strategy produces a plurality of re-perforations and is based at least in part on the limited-entry perforation strategy. The re-perforation strategy is adapted to at least substantially align a portion of the re-perforations with a portion of the limited-entry perforations.
Owner:BURDETTE JASON A +4

Method of three-phase unbalance load flow calculation based on complex affine mathematical theory

The invention discloses a method of three-phase unbalance load flow calculation based on the complex affine mathematical theory. The method includes inputting network original parameters including impedance values of each line and transformers, and active power and reactive power of each load node phase; initializing amplitude values and phase angles of each load node phase voltage; setting zero of iteration; calculating each phase injected current complex affine vector of each load node; starting from an end load node, performing summation calculation of branch current, and acquiring starting current complex affine values of each phase of each branch; and utilizing a set original load node voltage as a boundary condition to calculate voltage drop of each phase of each branch and end voltage complex affine values. By the method compared with the prior art, effective optimization of an uncertain load flow calculation interval algorithm is provided, interval load flow result conservative property, defects of an interval method are overcome, load flow of a distribution network containing uncertain information can be figured out effectively, and conservative property in the process of interval load flow calculation can be solved.
Owner:TIANJIN UNIV

Algorithm for the automatic determination of optimal AV and VV intervals

Methods and devices for determining optimal Atrial to Ventricular (AV) pacing intervals and Ventricular to Ventricular (VV) delay intervals in order to optimize cardiac output. Impedance, preferably sub-threshold impedance, is measured across the heart at selected cardiac cycle times as a measure of chamber expansion or contraction. One embodiment measures impedance over a long AV interval to obtain the minimum impedance, indicative of maximum ventricular expansion, in order to set the AV interval. Another embodiment measures impedance change over a cycle and varies the AV pace interval in a binary search to converge on the AV interval causing maximum impedance change indicative of maximum ventricular output. Another method varies the right ventricle to left ventricle (VV) interval to converge on an impedance maximum indicative of minimum cardiac volume at end systole. Another embodiment varies the VV interval to maximize impedance change.
Owner:MEDTRONIC INC

Test system for grounding grid

The embodiment discloses a test system for a grounding grid. The test system comprises piles, a power supply forming a set frequency difference with power frequency, human body simulation resistors, a parameter acquisition device and an arithmetic device. The piles comprise current piles and voltage piles. The parameter acquisition device is used for acquiring current values of the current piles and voltage values of the voltage piles, acquiring a distance between a first pile and a second pile and a distance and a resistance value between the second pile and a third pile, and acquiring voltage values at the two ends of each of a first human body simulation resistor and a second human body simulation resistor, wherein the current values of the current piles and the voltage values of the voltage piles are measured according to a straight-line method; and the distance between the first and second piles and the distance and the resistance value between the second and third piles are measured according to a quadrupole equal-interval method. The arithmetic device is used for calculating grounding resistance, soil resistivity, contact resistance and step resistance according to a set formula. Non-power frequency current is used for testing, so that the interference of the power frequency to the measurement current is avoided, the adoption of heavy current for measurement is not required, and the size of the measurement power supply is reduced.
Owner:STATE GRID ZHEJIANG NINGBO YINZHOU POWER SUPPLY LTD CO +1

Methods of stabilizing weakly consolidated subterranean formation intervals

ActiveUS20140238673A1Enhance the at least one fractureFluid removalSealing/packingNanoparticleInterval method
Methods of fracturing a weakly consolidated target interval in a wellbore in a subterranean formation including providing a pad fluid comprising an aqueous base fluid and nanoparticulates; providing a fracturing fluid comprising an aqueous base fluid and gravel; introducing the pad fluid in the wellbore at or above a fracture gradient rate so as to create or enhance at least one fracture at or near the weakly consolidated target interval, such that the nanoparticulates in the pad fluid penetrate into the weakly consolidated target interval and into the at least one fracture; introducing the fracturing fluid in the wellbore at or above the fracture gradient rate so as to enhance the at least one fracture and form a proppant pack in the at least one fracture; and consolidating the weakly consolidated target interval.
Owner:HALLIBURTON ENERGY SERVICES INC

Semen diluent and method for artificial insemination of breeding hens at interval of six days

The invention discloses semen diluent and a method for artificial insemination of breeding hens at an interval of six days. The semen diluent comprises semen diluent 1, semen diluent 2 and semen diluent 3; the semen diluent is prepared from the following ingredients in part by weight: 5-7 parts of monosaccharide, 7.2-10.1 parts of buffering substance, 1.5-2.8 parts of antibiotics, 0.2-1.2 parts of weak electrolyte, 6.4-8.3 parts of vitamin, 0.3-0.5 parts of EDTA-Na (ethylenediamine tetraacetic acid disodium salt) or 1.5-2 parts of lycopene. The semen diluent is adopted for artificial insemination by adopting a six-day interval method, the sperm motility is effectively improved, the fertilization probability is increased, the labor intensity of workers is effectively reduced, the investment of labor cost is also reduced, and working stress caused by less breeders can be alleviated.
Owner:LONGAN FENGMING FARMING

Mine moving target positioning method based on RSS and TOA complementation

The invention discloses a mine moving target positioning method based on RSS (received signal strength) and TOA (time of arrival) complementation, which combines an RSS method and a TOA method and overcomes the defect of overlarge positioning error caused by a traditional single positioning method. The method comprises adopting a distance measurement interval method to suppress an NLOS error signal, solving a distance correction weight value according to a distance relative error value between every two nearest neighbor positioning base stations in the roadway, and performing distance correction on the distance measurement value; obtaining the weight of each distance measurement value by adopting a speed threshold function method, and optimizing the distance measurement values according to the weights; and performing accurate positioning calculation on the corrected distance estimation value through a weighted positioning method. The method solves the problem that an existing mine personnel positioning system and method is influenced by the environment of a roadway and is insufficient in positioning accuracy, is simple and effective in positioning process, has strong anti-electromagnetic interference capability, and can effecively realize the accurate positioning of underground coal mine personnel, vehicles and other moving targets.
Owner:CHINA UNIV OF MINING & TECH (BEIJING)

Calibration measurement method and system for single-frequency steady-state sine machinery vibrating amplitude phase characteristic

The present invention belongs to the field of metering measurement technology, in the concrete, it relates to a calibration measurement method of vibration and its calibration measurement system. Said invention provides an improved homodyne time interval method based on general Michelson laser interferometer, said method can reduce the computing quantity due to noise signal and can simplify zero-crossing point position judgment. The invented calibration measurement system includes Michelson laser interferometer, computer and synchronous data acquisition card. Said invention can be used for calibrating work of acceleration sensor.
Owner:NAT INST OF METROLOGY CHINA

Thermal-electric coupling multi-energy flow system power risk assessment method based on interval method

The invention relates to a thermal-electric coupling multi-energy flow system power risk assessment method based on an interval method, and belongs to the technical field of risk assessment of the comprehensive energy system. According to the risk assessment method, a multi-energy flow system equipment model and a multi-energy flow system stochastic model are established, the consumption effect ofoptimal scheduling of the energy storage equipment and the flexible unit in the system on the uncertainty is considered and the interval method solving the stochastic problem is given, and the size of the risk of the uncertainty of the renewable energy source and the uncertainty of energy consumption of the electricity user and the heat user in a day in the future on the multi-energy flow systempower balance is calculated. According to the method, the operation risk of the electric-thermal coupling multi-energy flow system can be more accurately calculated so that the operation safety can beenhanced, the operation cost of the multi-energy flow system can be reduced, and certain contribution is made for searching multi-consumption of the renewable energy source and multi-energy system joint scheduling.
Owner:BEIJING KING STAR +1

Electric power plant circulating water rock plug type intake and construction method

The invention provides a rock-plug type water intake for the circulating water of power plants, as well as a construction method thereof. The rock-plug type water intake is arranged near a deep pool and mainly comprises a rock plug, a ballast collection pit and a derivation tunnel behind the ballast collection pit, wherein the derivation tunnel is arranged in a mountain body; an axis close to an inlet segment declines so as to keep the axis of the rock-plug type water intake at an upward inclination angle between 35 and 60 degrees; the outlet end of the derivation tunnel is directly connected with an inflow forebay of a circulating pump room; the sinking-type ballast collection pit is built between the derivation tunnel and the rock plug; the cross sections of the derivation tunnel and the rock plug are round, similarly round, square or rectangular; and the thickness-diameter ratio of the rock plug is between 1.13 and 1.50. The construction method comprises the following steps: the excavation construction of the derivation tunnel and the ballast collection pit is performed according to a new Austrian method; whether to line or not is determined according to the conditions of bedrock; the rock plug is blasted by use of a presplitting and millisecond time interval method; and once the rock plug is blasted, all ballast of the rock plug enters the prearranged ballast collection pit under the action of external water pressure. The construction method has the advantages of reducing project investment, shortening construction period, improving the operation efficiency of a circulating water system, and the like.
Owner:ZHEJIANG ELECTRIC POWER DESIGN INST

Methods, apparatuses, and computer program products for delivering one or more television programs for viewing during a specified viewing interval

Methods, apparatuses, and computer program products for delivering one or more television programs for viewing during a specified viewing interval. The methods include receiving a viewer's selection of a broadcast channel from an electronic program guide, presenting the viewer with a list or menu of two or more programs on the viewer selected broadcast channel that are available for viewing during a specified viewing interval, and receiving a viewer's selection of a program from the list or menu. If the specified viewing interval has commenced and has not yet expired, the viewer selected program is delivered for viewing.
Owner:BELLSOUTH INTPROP COR

Interval uncertainty optimization method based on BP neural network differentiation and interval analysis

The invention discloses an interval uncertainty optimization method based on BP neural network differentiation and interval analysis. The interval uncertainty optimization method comprises the steps of training a BP neural network agent model of an original model; employing NSGA-II algorithm in an outer-layer optimization solver, calculating an inner layer interval by adopting an interval analysismethod; for each group of design variables, carrying out interval division by adopting a sub-interval technology; inputting the interval median of the subinterval combination into a neural network tocalculate an output response, carrying out a neural network first-order differential operation, carrying out first-order Taylor series expansion on the uncertainty objective function and the constraint function, and calculating the intervals by adopting an interval expansion method and an interval set method; converting the uncertainty optimization model into a multi-objective determinacy optimization model through an interval sequence, an interval possibility and an error economy evaluation index; and using NSGA-II algorithm for performing simulation search to obtain a Pareto optimal solution set. Through the method, the nonlinear interval uncertainty optimization problem, especially the engineering uncertainty optimization problem, can be efficiently solved, and the method has high engineering practical value.
Owner:NANJING UNIV OF SCI & TECH

High-speed train noise prediction method based on interval neural network

InactiveCN105760658AImprove reliabilitySolve the problem of parameter value uncertaintyInformaticsSpecial data processing applicationsInterval methodAlgorithm
The invention discloses a high-speed train noise prediction method based on the interval neural network. The problem of uncertainty of acquired parameters affecting high-speed train noise is solved by means of the general interval theory, and high-speed train operation noise is accurately predicted with an interval neural network model. The method comprises the steps of 1, selecting parameters affecting high-speed train noise; 2, acquiring the historical data of the parameters affecting noise; 3, conducting data preprocessing; 4, conducting interval treatment of preprocessed data; 5, establishing an initial interval neural network model; 6, training the initial interval neural network model; 7, predicting high-speed train noise. The problem of uncertainty of parameters affecting high-speed train noise is solved by means of the general interval method, high-speed train operation noise is predicted by means of the interval neural network model predicting method, and the reliability of a noise prediction result is improved.
Owner:EAST CHINA JIAOTONG UNIVERSITY
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