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211 results about "Line search" patented technology

In optimization, the line search strategy is one of two basic iterative approaches to find a local minimum 𝐱* of an objective function f:ℝⁿ→ℝ. The other approach is trust region. The line search approach first finds a descent direction along which the objective function f will be reduced and then computes a step size that determines how far 𝐱 should move along that direction. The descent direction can be computed by various methods, such as gradient descent, Newton's method and quasi-Newton method.

PTAM improvement method based on ground characteristics of intelligent robot

The invention discloses a PTAM improvement method based on ground characteristics of an intelligent robot. The PTAM improvement method based on ground characteristics of the intelligent robot comprises the steps that firstly, parameter correction is completed, wherein parameter correction includes parameter definition and camera correction; secondly, current environment texture information is obtained by means of a camera, a four-layer Gausses image pyramid is constructed, the characteristic information in a current image is extracted by means of the FAST corner detection algorithm, data relevance between corner characteristics is established, and then a pose estimation model is obtained; two key frames are obtained so as to erect the camera on the mobile robot at the initial map drawing stage; the mobile robot begins to move in the initializing process, corner information in the current scene is captured through the camera and association is established at the same time; after a three-dimensional sparse map is initialized, the key frames are updated, the sub-pixel precision mapping relation between characteristic points is established by means of an extreme line searching and block matching method, and accurate re-positioning of the camera is achieved based on the pose estimation model; finally, matched points are projected in the space, so that a three-dimensional map for the current overall environment is established.
Owner:BEIJING UNIV OF TECH

Method and apparatus for efficient training of support vector machines

The present invention provides a system and method for building fast and efficient support vector classifiers for large data classification problems which is useful for classifying pages from the World Wide Web and other problems with sparse matrices and large numbers of documents. The method takes advantage of the least squares nature of such problems, employs exact line search in its iterative process and makes use of a conjugate gradient method appropriate to the problem. In one embodiment a support vector classifier useful for classifying a plurality of documents, including textual documents, is built by selecting a plurality of training documents, each training document having suitable numeric attributes which are associated with a training document vector, then initializing a classifier weight vector and a classifier intercept for a classifier boundary, the classifier boundary separating at least two document classes, then determining which training document vectors are suitable support vectors, and then re-computing the classifier weight vector and the classifier intercept for the classifier boundary using the suitable support vectors together with an iteratively reindexed least squares method and a conjugate gradient method with a stopping criterion.
Owner:R2 SOLUTIONS

Rotor unmanned aerial vehicle coverage search flight path planning method for polygonal region having no-fly zone

ActiveCN105973235AReduce the number of decomposition search unitsAvoid crossingNavigational calculation instrumentsNo-fly zoneGrating
The invention relates to a rotor unmanned aerial vehicle coverage search flight path planning method for a polygonal region having a no-fly zone, wherein the method comprises the steps: step 1, determining a coverage direction, wherein the direction from a polygon width-corresponding top point to edge is a coverage direction for realizing shortest-path polygon region coverage searching; step 2, transforming a coordinate, taking an X axis of a new coordinate system (OX'Y') as a coverage direction, and making an origin point of the new coordinate system (OX'Y') the same as an origin point of an original coordinate system; step 3, according to the transformed to-be-covered polygon region and obstacle, carrying out Boustrophedon searching unit decomposition; step 4, determining an alternative optical grating line search flight path set of each searching unit; step 5, determining the sequence and the flight path of each searching unit of the unmanned aerial vehicle based on a greedy strategy; and step 6, carrying out coordinate inverse transformation, transforming flight path points into flight path points in the original coordinate system through coordinate inverse transformation, and thus obtaining an original task searching flight path. The method ensures optimal property of understanding while reducing the time consuming of calculation.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY

Platform and method for automatically generating design schematic diagram of automatic test system

The invention discloses a platform and method for automatically generating a design schematic diagram of an automatic test system, wherein the platform comprises an input module for instrument device resource and connection constraint relationship, a database module, a database management module, a parameter selection and pre-processing module, an automatic layout module, an automatic routing module, as well as a drawing result display and storage module. A user inputs data via the input module for instrument device resource and connection constraint relationship; the parameter selection and pre-processing module is used for grouping and grading instruments according to the parameters selected by the user; the automatic layout module is used for performing an automatic layout operation; and the automatic routing module is used for finishing a routing operation. The method disclosed by the invention is mainly provided for finishing an automatic layout based on a method of intersecting the fewest lines, and finishing the connection among instrument ports by applying a target-oriented line search routing algorithm according to the selection of information types by the user. The platform and the method disclosed by the invention can realize rapid and efficient layout of the instrument model, and satisfy the drawing demand of the design schematic diagram in actual application.
Owner:BEIHANG UNIV

On-line touch-and-talk pen system and touch reading method thereof

InactiveCN103236195ARealize random readingPracticalElectrical appliancesData informationLine search
The invention discloses an on-line touch-and-talk pen system, which comprises a scanning module, a storage module, an on-line searching module and an output module, wherein the scanning module is used for scanning feature information of books to be read; the storage module is used for receiving and storing the feature information transmitted by the scanning module; the on-line searching module is used for realizing connection of the storage module and a network on-line high-volume database; data information matched with the feature information stored in the storage module is acquired through on-line searching; and the output module is used for outputting data information acquired by the on-line searching module, and playing the data information in a phonetic form. The on-line touch-and-talk pen system is combined with an on-line searching function, the books are scanned, and the features of the books are extracted, and through on-line searching matching, the corresponding information data are acquired, are fed back to the storage module, are output and are subjected to voice playing, so that random touch reading on any book is realized, the application range is enlarged, and the practicability is strong. The invention also provides a touch reading method of the on-line touch-and-talk pen system.
Owner:SUN YAT SEN UNIV

Virtual technology transfer network

InactiveUS20060173699A1Process is inefficientA large amountOffice automationIntellectual propertyTrademark
A Virtual technology transfer Office and method for a) accessing a secure on-line system for entering, retrieving, displaying, editing, storing and printing technology transfer and intellectual property information; b) utilizing voice commands or manually entered numeric, alpha or alphanumeric characters to navigate through the an on-line electronic interactive environment. c) Performing instantaneous on-line searching, ranking and scoring of invention disclosure based on relevant prior art; d) working on the internet or on-line meeting place alone or with others. e) Drafting or revising documents alone or in tandem in a virtual meeting place; f) Sending and receiving electronic notifications; g) Sending and receiving messages; h) Creating, reviewing, revising, attaching and printing documents; i) Searching Patent & Literature Bases instantaneously or immediately; j) creating and sending electronic bids to contract attorneys; compiling, ranking and selecting attorneys for the work; k) accepting and responding to electronic bids from contract attorneys; l) accepting and responding to invoices from contract attorneys; m) generating technology transfer and intellectual property documents n) filing of patent and trademark applications electronically; o) and submitting federal patent reports electronically.
Owner:FLORIDA A&M UNIVERSITY

Simplification method for optimal cutting machine control strategy search of electric system transient stability

The invention discloses a simplification method for the optimal cutting machine control strategy search of electric system transient stability, and belongs to the technical field of electric system emergency control. On the basis of an EEAC (Extend Equal Area Criterion), according to the analysis results and the difference of a SEEAC (Static EEAC) algorithm and a DEEAC (Dynamic EEAC) algorithm, an anticipatory fault set is classified on the basis of transient stability severity; a diffset which is identified as an unstability class is subjected to a simplification operation by utilizing an intermediate result subjected to margin calculation through the SEEAC algorithm and the DEEAD algorithm during identifiction; meanwhile, a cutting machine control strategy checking index is designed to check the effectiveness of each cutting machine and guide a simplification method and a traditional method to switch so as to guarantee that the obtain cutting machine control strategy is optimal. The method can enable most parts of diffsets which are identified as the unstability class to obtain the optimal cutting machine control strategy by applying the simplification method without adding other calculation amounts, and has a great theoretical and engineering meaning for the on-line search of the electric system transient stability.
Owner:STATE GRID ELECTRIC POWER RES INST +3

Joint Full Wavefield Inversion of P-Wave Velocity and Attenuation Using an Efficient First Order Optimization

A method for iteratively inverting seismic data to jointly infer a model for at least P-wave velocity and attenuation parameters of the subsurface, the method including: jointly inverting the P-wave velocity and attenuation parameters with an iterative visco-acoustic full wavefield inversion process, wherein the iterative visco-acoustic full wavefield inversion process includes computing a gradient of an objective function, the objective function measuring a misfit between all or part of the seismic data and corresponding model-simulated seismic data; for each of the P-wave velocity and attenuation parameters, computing a search direction in model space from the gradient; determining line search step sizes α and β for the search directions for the P-wave velocity and attenuation parameters, respectively, wherein a ratio of the step sizes is a function of the P-wave velocity parameter; and using the step sizes α and β and the search directions for each of the P-wave velocity and attenuation parameters, computing a new search direction in model space, then performing a line search along the new search direction to arrive at a new step size, and using the new step size and the new search direction to generate an updated model for a current iteration of the iterative visco-acoustic full wavefield inversion process.
Owner:EXXONMOBIL UPSTREAM RES CO
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