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34results about How to "Intuitive explanation" patented technology

Complex machine learning model interpreting method and device based on local linearization

InactiveCN107392318AFully consider local characteristicsLook for dominant featuresMathematical modelsAlgorithmLinear model
The invention provides a complex machine learning model interpreting method and device based on local linearization, and the method comprises the steps: collecting any one point in a sample set as a sample point, and carrying out the random sampling of a plurality of sampling points around the sample point; obtaining the Euler distance between the sample point and each sampling point in an expression space, so as to enable the Euler distances to serve as the weights of the sampling points; obtaining the difference between a to-be-interpreted machine learning model and the fitting result of an interpretation function according to the weight of each sampling point and a linear model, so as to obtain an optimizing problem; carrying out the optimization solving of a linear regression problem employing a regularization penalty factor in the optimizing problem, and obtaining an interpretation result. The method can achieve the interpretation of a complex machine learning model in the neighborhood of each data point, gives full consideration to the local characteristics of a sample space, can effectively find the main features of different regions of the sample space, is more visual and convenient, and can be used for the interpretation of various types of machine learning models.
Owner:TSINGHUA UNIV +2

Demonstrating device for frequency-conversion sine alternating current characteristics

The invention aims at making up for the defects in the prior art, and provides a demonstrating device for demonstrating a sine frequency-conversion alternating current circuit characteristics. The demonstrating device can visually demonstrate characteristics of alternating current and improve demonstrating accuracy. The demonstrating device comprises a power supply part, an indicating part and a demonstrating part. The power supply part comprises a triangle-wave generator, a sine wave formation circuit and a sine power amplifying circuit. The triangle-wave generator, the sine wave formation circuit and the sine power amplifying circuit are connected in sequence. The demonstrating part comprises a load circuit resistance, an inductance and capacity branches which are connected in parallel. A detachable electronic element is arranged in each branch and respectively connected with one small bulb in series. By means of a way of changing frequency of a frequency-conversion power circuit, the demonstrating device enables users to observe light and dark changing situations of bulbs connected with the resistance, the inductance and the capacity branches in series, and can detect perfect sine wave shape from a wave-demonstrating device, can visually demonstrate to students, and explain the characteristics of the sine wave alternating current.
Owner:重庆乐教科技集团股份有限公司

Multifunctional medical electronic film viewing device and film viewing method for medical films

The invention discloses a multifunctional medical electronic film viewing device and a film viewing method for medical films.Related medical workers can review digital films and physical films throughthe multifunctional medical electronic film viewing device; the multifunctional medical electronic film viewing device comprises a shell, a control part, a liquid crystal module and a light-emittingassembly. The light-emitting assembly, the liquid crystal module and the control part are contained in the shell, the liquid crystal module is arranged on the light-emitting assembly, the control partis electrically connected with the light-emitting assembly and the liquid crystal module, the liquid crystal module is used for displaying a digital film or serves as a highlight lamp box to assist in reviewing a physical film, and the light-emitting assembly is used for illuminating the liquid crystal module. The liquid crystal module is controlled by the control part to display the digital filmand reach the DICOM Part 14 standard, or the liquid crystal module is switched to be highlighted to serve as the lamp box to assist in reviewing the physical film. The structure of the multifunctional medical electronic film viewing device provided by the invention has the advantages that: physical films and digital films can be viewed in compliance; and functions are rich.
Owner:深圳市医凯影像科技有限公司

Orthopedic surgery simulation method and application thereof

The invention discloses an orthopedic surgery simulation method and an application thereof, and the method comprises the steps: receiving cutting point information and pre-clearing part information inputted by a user, and marking a cutting position point corresponding to the cutting point information on a bone model; taking the shortest connecting line as a target, and connecting every two adjacent cutting position points along the edge forming the minimum geometric unit of the bone model to form a closed sawtooth-shaped cutting boundary; smoothing each included angle on the closed sawtooth-shaped cutting boundary into an obtuse angle to form a closed smooth cutting boundary; from the closed smooth cutting boundary, traversing the edges of all the minimum geometric units corresponding to the pre-removed part information and removing the edges to realize bone cutting, and forming a cutting surface based on the closed smooth cutting boundary. A bone cutting simulation algorithm providedby the invention provides a visual way for clearly describing the operation process for a patient and family members thereof before an operation, and also provides a new way for teachers to perform operation teaching on new doctors, so the operation teaching and practice cost can be reduced, and the user experience can be enhanced.
Owner:HUAZHONG UNIV OF SCI & TECH

Computer-aided liver operation planning three-dimensional modeling system

The invention relates to the technical field of operation modeling, and discloses a computer-aided liver operation planning three-dimensional modeling system, which comprises an operation process rehearsal system and an operation positioning system, and is characterized in that the operation process rehearsal system comprises an operation process broadcasting system, an operation three-dimensional modeling system and an operation process teaching system; related examination data are imported into the operation process rehearsal system, the system calculates and analyzes the data, the operation three-dimensional modeling system carries out three-dimensional reconstruction on a preoperative two-dimensional CT / MRI image, and the operation process teaching system is divided into operation rehearsal and operation implementation process teaching. According to the system, various data are calculated and analyzed through the system, the volume of the liver to be resected and the volume of the remaining liver are calculated, three-dimensional space distance data of tumors and important blood vessels are measured in real time, the volume of the selectively resected liver is calculated, and the operation implementation efficiency is greatly improved.
Owner:WEST CHINA HOSPITAL SICHUAN UNIV

A drilling simulation system and teaching method based on non-sequential operation mode

The invention discloses a drilling simulation system based on a non-sequential operation mode, which includes an operation module, and the operation module is connected with a student simulation operation module and a teaching operation module, and the teaching operation module interacts with the student simulation operation through an operation pause module The modules are connected, the student operation module is connected with the digital drilling rig simulation module, the digital drilling rig simulation module is connected with a non-sequenced environment simulation module, and the non-sequenced environment simulation module is connected with an environment-free environment simulation module through a random selection module. Sequence occurrence input module, the digital drilling rig simulation module is connected with a downhole situation display module. The beneficial effects of the present invention are: it can prevent several people from making the same mistake, the teaching quality can be improved, the situation in reality can be effectively simulated, and the emergency rescue measures taken when an emergency accident occurs can be simulated more intuitively, so as to improve To deal with emergencies and reduce losses.
Owner:中国人民解放军68612部队

A Method of Calculating the Empirical Formula of Sherwood Number Between Gas and Liquid in Porous Media Using CT

The invention relates to a method for calculating an empirical relation expression between gas-liquid Sherwood numbers inside a porous medium by applying CT. The method comprises the steps of firstly calculating the bubble volume content and a gas-liquid mass transfer Sherwood number inside the porous medium of different gas injection and liquid injection directions according to a CT image stack; calculating a liquid-phase Reynolds number according to lamellar average porosity, the bubble volume content and the liquid injection speed; classifying the acquired Sherwood numbers, the Reynolds numbers and the volume content values into different data sets according to different gas injection and liquid injection directions; dividing each data set into a plurality of different local data sets, setting a target empirical relation expression, performing local nonlinear regression analysis, and quickly searching and eliminating abnormal values which are possibly caused by the measurement process by being combined with corresponding CT images; and then performing global nonlinear regression analysis on the remaining data to acquire an empirical relation expression between gas-liquid Sherwood numbers inside the porous medium under different gravity conditions. The calculation and convergence speed of a fitting model is accelerated, a real and effective data result in the experiment process is completely covered, and the model precision is improved.
Owner:DALIAN UNIV OF TECH
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