46results about How to "Accurate conversion" patented technology

The invention provides a rock mineral micromechanical evolution characterization method based on a convolutional neural network. The rock mineral micromechanical evolution characterization method comprises the following steps: step 1, obtaining rock sample micromechanical properties through a nanoindentation experiment; 2, performing deconvolution statistical analysis by using a Gaussian mixture model, and obtaining mechanical and volume fractions of each phase through a nanoindentation experiment; step 3, utilizing a Mori-Tanaka scale upgrading method to understand a convolution result, and performing rock macromechanical property prediction in combination with a convolutional neural network; and step 4, performing precision checking calculation on an output result of the convolutional neural network model until the prediction precision meets a preset requirement. According to the method, the microscopic mechanical parameters of the rock sample are obtained through the grid nanoindentation, statistical analysis is carried out on the nanoindentation test result by utilizing a deconvolution method, the mechanical property of the macroscale of the rock is obtained in combination with machine learning and a scale upgrading model, and a bridge for connecting the macroscale and the microscale is established; the method can effectively solve the problem of inaccurate prediction of rock micromechanical parameters on the macroscale and the problem of mechanical property characterization caused by scale difference.

The invention relates to the technical field of intelligent medical treatment, and discloses a pancreatic cancer evolution simulation and dynamic intervention system based on multi-model driving, and the system comprises a multi-source data fusion module which is used for accessing and processing patient data, and forming a multi-dimensional feature set; the model fusion construction module is integrated with a model coupler and can construct a patient-specific integrated calculation model; the twinborn calibration generation module is used for generating pancreatic cancer digital twinborn matched with the initial state of the patient; and the evolution simulation and intervention module is used for running the pancreatic cancer digital twins, simulating the natural evolution trajectory of the tumor and carrying out quantitative simulation on the input virtual treatment scheme effect. According to the method, by constructing the patient-specific digital twins, normal form transformation from static diagnosis to dynamic prediction is achieved, and a quantitative evaluation basis can be provided for selection of clinical treatment schemes.

The application relates to the technical field of big data, and discloses a database conversion method and device, computer equipment, a storage medium and a computer program product. The method comprises the following steps: acquiring to-be-converted database data; analyzing the to-be-converted database data to obtain a node set and hierarchical attributes of each node; performing framework updating on the node set according to the adaptation degree corresponding to the hierarchical attributes to obtain target framework database data; and performing database conversion on the target framework database data according to target data configuration information to obtain target database data. The method can more smoothly perform database conversion.

The utility model discloses a linear motor counterweight device which comprises a counterweight box, an adjusting device is installed on the counterweight box, the adjusting device comprises a fixed sleeve, a shifting sleeve, a moving rod, a moving sleeve, a moving groove, an inserting groove, an inserting rod, a connecting spring, a pressing plate, a moving block and a moving plate, the moving rod penetrates through the fixed sleeve in a sliding mode, the moving groove is formed in the fixed sleeve in an inclined mode, and the moving block is arranged in the moving sleeve. The inserting groove is formed in the moving block, the inserting rod is connected to one side of the pressing plate, the moving block is connected to one side of the moving plate, a locking mechanism is installed on the outer side of the fixing sleeve, and the locking mechanism comprises a transverse plate, an arc-shaped rod, an arc-shaped spring, a return block, a matching groove, an arc-shaped hole, the fixing block, a longitudinal plate and a matching plate. According to the utility model, not only can the thrust applied by the spring be flexibly adjusted according to linear motors of different models and working condition requirements, but also the long-term stability of parameters after adjustment can be ensured.

The invention relates to the technical field of pressure controllers, in particular to a pressure controller with a terminal equipped with a buffer structure, which comprises a main shell, a pressure leading port, a pressure sensing regulation and control element, a wiring bin, a touch control module and a corrugated rod, the wiring bin extends to form a neck tube for anchoring a lead, and an inner hole of the neck tube is arranged to be a variable cross-section zigzag hole channel; a self-locking thread is arranged on the peripheral surface of the neck tube; the touch module comprises a signal terminal and an insulating base, the insulating base extends out of a flexible cantilever beam abutting against the inner wall of the wiring bin, and the thickness of the flexible cantilever beam is gradually reduced in the extending direction; the corrugated rod is connected between the pressure sensing regulation and control element and the touch control module. Dragging of an external lead is blocked through the wiring bin with the self-locking threads and the labyrinth channel, vibration is absorbed through the flexible cantilever beam touch control module, and flexible transmission is carried out in combination with the corrugated rod; the purposes of intercepting mechanical interference, maintaining terminal stability and ensuring accurate signal output of equipment under complex working conditions are achieved.

The invention relates to the technical field of intellectual property data processing, and discloses an intellectual property data collection method and system based on multi-source data fusion, and the method comprises the steps: obtaining an original information set, and carrying out the clustering and grouping processing of the original information set, and obtaining a classification data set; performing feature verification and matching analysis on the classification data set to obtain a feature matching score; if the feature matching score is higher than a preset analysis threshold value, performing structured analysis on the classification data set to obtain a preliminary analysis field; performing standardized mapping processing on the preliminary analysis field to obtain data in a unified format; performing associated value mining on the data in the unified format to obtain high-value associated information; and fusing the high-value associated information to a preset overall data set to obtain a target intellectual property data set. According to the method, efficient integration and deep value mining of multi-source heterogeneous data can be realized, and the acquisition precision and standardization level of intellectual property data are remarkably improved.

The application discloses a kind of spatial registration method and system of visible light image and infrared image, it is related to spatial registration technical field, the position coordinate in the position coordinate in the coordinate system of second bird's-eye view obtained by visible light camera is registered with the position coordinate in the position coordinate in the coordinate system of second bird's-eye view obtained by infrared camera, more accurate conversion relationship can be obtained, and the acquisition process of conversion relationship is simpler than prior art, does not need a large number of training images, low in cost, strong practicality.

The invention discloses a self-adaptive relay platen row and column coordinate detection method, and belongs to the field of computer vision and industrial automatic detection. The method comprises the following steps: firstly, acquiring an initial detection frame of a pressing plate block by using a deep learning model, and executing asymmetric center point compensation according to categories to determine a feature center point; then dynamically deriving a scale adaptive threshold based on a global minimum neighborhood distance, and constructing a global convex hull and an edge point cloud to establish a physical contour reference; then, a multi-criterion judgment condition recursive fitting algorithm is adopted to extract a row-column biaxial frame from the fragmented point set, and row and column attributes are automatically decoupled and judged through maximum included angle search and slope analysis; and finally, projecting the feature points to a biaxial intersection point, realizing accurate mapping from space coordinates to logic numbers, and outputting a row-column logic index. According to the method, the problem of difficulty in row and column identification caused by a complex shooting view angle, perspective deformation and pressing plate installation deviation is effectively solved, and the accuracy and robustness of state identification of the relay voltage plate for electric power inspection are remarkably improved.

This invention discloses a structural thermo-mechanical coupling method and apparatus considering isogeometric analysis, belonging to the field of thermodynamics. The method includes: S1. Establishing an isogeometric NURBS model: providing the basis for expressing geometric and physical fields for thermo-mechanical coupling analysis, achieving seamless integration of CAD and CAE; S2. Calculating the transient temperature field based on the central difference method: obtaining the temperature distribution of the structure at different times, providing temperature input for subsequent thermo-mechanical coupling; S3. Transforming the temperature field into equivalent temperature loads: converting the thermal effects caused by temperature changes into equivalent loads identifiable by structural mechanics analysis; S4. Solving the stiffness equation of the structure under the combined action of external forces and temperature: obtaining the displacement matrix of the structural control points; S5. Solving the structural coupling field based on the displacement matrix: obtaining all key physical quantities in the thermo-mechanical coupling field, completing the coupling analysis. This invention can verify the feasibility of applying isogeometric analysis in coupled fields.

The application discloses a query method based on a knowledge base and a large model, and the method comprises the following steps: constructing a knowledge base of a database; obtaining target language information containing a user question input by a user; generating a target pseudo mode corresponding to the target language information based on the knowledge base; screening out a minimum table set associated with an answer to the user question from the knowledge base based on the target pseudo mode; encapsulating multi-table connection logic in the minimum table set into a query view; retrieving a reference example pair list of an indication question and a query sentence mapping relationship most similar to the user question from the knowledge base based on the query view and the target language information, wherein each example pair in the reference example pair list represents a mapping relationship between a question and a query sentence; generating a target query sentence corresponding to the target language information based on the user question, the target pseudo mode, the query view and the reference example pair list, and retrieving in the database based on the target query sentence to obtain a query result.

This invention discloses a telescopic live-line working insulation shielding device with an insulator as the fixing point, belonging to the technical field of insulation shielding devices. It includes: a fixing sleeve, fitted onto the top of the insulator body, with cable-passing grooves on both sides; and a shielding assembly, disposed on the side of the fixing sleeve, comprising multiple hard and soft covers; the multiple hard and soft covers are sequentially and alternately connected to form a hollow sleeve structure, which can be opened and closed relative to each other at its radial midpoint to secure it to the cable; and the hollow sleeve structure has two switchable states: a bent state and a rigid straight state. This telescopic live-line working insulation shielding device with an insulator as the fixing point improves the safety and shielding reliability of live-line work by alternately splicing hard and soft covers to form the shielding assembly.

This application discloses a battery pack display SOC control method, device, storage medium, and battery management system. The method includes: acquiring the current SOC to be displayed, the previous displayed SOC, and the current charge / discharge end calibration voltage; determining the current mapping rate based on the upper limit of SOC corresponding to the current charge end calibration voltage and the lower limit of SOC corresponding to the current discharge end calibration voltage; and mapping the current SOC to be displayed to the final displayed SOC using a preset charge / discharge mapping method based on the battery's charge / discharge state, the previous displayed SOC, and the current mapping rate. This application determines the mapping rate based on the upper and lower limits of SOC during charge / discharge, and combines this with an incremental accumulation algorithm to map the SOC to be displayed, enabling the SOC to be intelligently, smoothly, and user-orientedly mapped to the displayed value.

The application relates to the technical field of educational data processing, and particularly discloses a wrong question mining and accurate printing management system for learning situation big data. The system comprises a learning situation data acquisition module, a wrong question value evaluation module, a student state perception module, a dynamic priority scheduling module and an intelligent printing execution module. The wrong question value evaluation module performs multi-dimensional quantitative analysis on wrong questions, the student state perception module performs real-time analysis on student learning states, the dynamic priority scheduling module calculates the dynamic comprehensive priority of a task based on a composite model and reconstructs a printing queue, and the intelligent printing execution module sequentially executes printing. The application quantifies the value of wrong questions and student states, realizes dynamic intelligent scheduling of a printing task, ensures that high-value wrong questions are preferentially printed in a high-concentration learning window period, effectively reduces teaching feedback delay, and improves the accuracy of resource investment and teaching effect.

The invention relates to the field of mechanical surface engineering and bionic design, in particular to a bionic tooth surface microstructure concrete design method. The method comprises the following steps: acquiring point cloud data of a shell body surface, and constructing a shell body surface three-dimensional model by using the point cloud data; constructing a bionic coupling element matrix by using the shell body surface three-dimensional model; constructing an equal-arc-length parameter sequence and a gray mapping matrix based on the bionic coupling element matrix, and constructing a structural feature matrix by using the equal-arc-length parameter sequence and the gray mapping matrix; and establishing a tooth surface geometric model of the target gear, and mapping the structural feature matrix to a parameter domain of the tooth surface geometric model to obtain initial micro-texture geometric distribution. And constructing a morphological design parameter matrix, and regulating and controlling the initial micro-texture geometric distribution by using the morphological design parameter matrix to obtain a bionic tooth surface micro-texture model. The problem that in the prior art, a quantitative conversion method from biological structure geometric characteristics to engineering tooth surface micro-texture design parameters is lacked is solved.

The application provides a fire point positioning method based on a thermal imaging camera, comprising: establishing an elevation data model with the camera position as the center, for querying the latitude and longitude coordinates and the elevation value according to the geographic distance and the angle; collecting a plurality of sets of data pairs of pixel coordinates and actual geographic distances under different angles; establishing a set of mapping functions from pixel coordinates to geographic distances based on the set of data pairs; for a detected fire point, the corresponding mapping function is selected to calculate the geographic distance from the fire point to the camera according to the pixel coordinates and the angle of the camera relative to the reference direction; and based on the elevation data model, the latitude and longitude coordinates and the elevation value of the fire point are queried using the geographic distance and the angle. Through the combination of the elevation data model and the set of mapping functions, the application realizes the rapid and accurate conversion of the fire point from the pixel coordinates to the geographic coordinates, effectively improves the positioning accuracy and efficiency, and provides reliable technical support for fire monitoring in complex terrains.

The application provides a natural language question to multi-model data query statement conversion method and device, and relates to the technical field of artificial intelligence, the method comprises the following steps: determining a natural language question input by a user; obtaining a corresponding mode item based on the natural language question; inputting the natural language question and the mode item into a conversion model to obtain a multi-model data query intermediate representation output by the conversion model; the conversion model is obtained based on sample natural language questions carrying first real labels and sample mode items; determining a target query statement template from at least two preset query statement templates based on the multi-model data query intermediate representation; and performing compilation processing on the multi-model data query intermediate representation according to the target query statement template to obtain a multi-model data query statement, which can efficiently and accurately convert natural language into a multi-model data query statement.

The application discloses a kind of oral cavity sensitive area identification-based oral irrigator intelligent regulation method and system, the method includes: obtaining user oral cavity image and receiving user graphical marking to sensitive area;Based on image and marking, through the multiscale analysis of fusion user subjective marking and image objective features, generate sub-region oral cavity sensitivity atlas;Mapping relationship between atlas coordinate system and oral irrigator nozzle physical coordinate system is established;Real-time tracking nozzle pose, and it is mapped to atlas to determine the sensitivity level of current area;According to the level, automatically adjust oral irrigator operating parameter.The application also contains feedback-driven online calibration mechanism, can dynamically optimize model and atlas according to user manual operation.The application solves the problem that objective image recognition and user subjective perception are disconnected in prior art, realizes accurate, dynamic, personalized oral cleaning.

The invention provides a low-power-consumption vital sign monitoring device, and belongs to the technical field of medical equipment. The sensor module, the processing and control module and the power supply and communication module are integrated in the wrist type device shell; the elastic band is located on one side of the wrist type device shell; the embedding groove is formed in one side of the wrist type device shell; the fixing rod is located inside, and the elastic band is located in the inlaying groove; according to the design philosophy that the system can accurately distribute energy according to a real-time task load, a high-power-consumption module is temporarily awakened only when necessary, and energy is supplied as required and dormancy is rapid, the overall power consumption of the device is reduced to an extremely low level on the premise of providing uninterrupted vital sign monitoring, so that the usable time after single charging is remarkably prolonged, and the service life of the device is prolonged. And the long-term endurance bottleneck problem of the wearable equipment is solved.

The invention discloses a private domain data distillation method and device from a natural language to a structured query language. The method comprises the steps that the identity of a first large model with the tool calling capacity is given to be a question generation agent, the question generation agent calls all pre-built tool functions, and a question list is generated based on a private domain database; updating the identity of the first large model as a structured query statement generation agent, calling each tool function by the structured query statement generation agent, and generating a corresponding structured query statement list based on the question list and the private domain database; and based on the problem list and the corresponding structured query statement list, training a second large model of the small-scale parameters to obtain a private domain data distillation model. By means of the mode, the natural language can be converted into the structured query language through the private domain data distillation model, the computing power is reduced, the structured query language is more accurately converted into the structured query statement suitable for the private domain database, and the accuracy and efficiency are improved.

The application discloses a movable emergency modular transformer substation, and relates to the technical field of transformer substations. The transformer substation comprises a shell, universal wheels, a voltage transformation mechanism and a temperature control mechanism. The voltage transformation mechanism and the shell are fixedly connected, the temperature control mechanism and the shell are fixedly connected, the temperature control mechanism and the voltage transformation mechanism are communicated, the shell and the universal wheels are fixedly connected, the universal wheels are located below the shell, and the temperature control mechanism is located on the periphery of the shell. The shell provides high-strength physical protection and support space for the whole device. The universal wheels located below the shell endow the transformer substation with flexible moving capability, so that the transformer substation can quickly respond to emergency demands. The voltage transformation mechanism is fixed in the shell to perform core voltage conversion operations. The temperature control mechanism located on the periphery of the shell and communicated with the voltage transformation mechanism can perform real-time thermal management on the internal environment of the shell, so that the voltage transformation mechanism can stably operate for a long time at a suitable temperature.

The application discloses a method for preparing high-density aviation fuel by one-pot degradation of waste PC plastic, which comprises the following steps: taking waste PC plastic as raw material, and adding a double-function synergistic catalyst in a high-pressure reaction kettle; under the joint action of a metal-supported catalyst and a solid superacid additive, the reaction steps of ester bond breaking, intermediate hydrogenation, aromatic ring saturation and hydrogenation deoxidization are continuously completed by one-pot method in the high-pressure reaction kettle, and high-density aviation fuel is prepared with high selectivity. The method avoids the complicated intermediate separation step in the traditional multi-step conversion process, the aviation fuel obtained is mainly propane-2,2-diyl dicyclohexane (C15), the selectivity of which is greater than or equal to 95%, the yield is as high as 95%, the density of the aviation fuel obtained is greater than 0.90 g / mL, the combustion heat is greater than 40 MJ / kg, the freezing point is lower than-35 DEG C, and the aviation fuel has excellent combustion performance and low-temperature performance. The application provides a green and efficient solution for the high-value upgrading and recycling of waste PC plastic, and meets the development strategy of circular economy.

The application relates to a method for evaluating single-particle effects in orbit based on a device irradiation system. The method comprises the following steps: identifying irradiation-sensitive devices according to a system function block diagram and a power supply block diagram, establishing a mapping relationship between the devices and the system function and failure criteria; carrying out multi-gradient heavy ion and proton irradiation tests, and counting the number of system function interruptions and the recovery time; calculating the failure cross section and fitting the Weibull model; obtaining the in-orbit heavy ion LET spectrum and the proton spectrum; calculating the in-orbit failure rates of each device for heavy ions and protons, and superimposing to obtain the total system failure rate; and calculating the total number of in-orbit single-particle failures and the average abnormal duration of the system during the task period, and generating an evaluation result. The method can quantitatively and systematically evaluate the in-orbit single-particle failure risk with the system function normal as the core criterion, and guide the design optimization of the system anti-single-particle, the in-orbit risk prediction and the reliability verification.

The invention relates to the technical field of data processing, in particular to an automatic checking system based on RFID and intelligent weighing fusion, and the system comprises an acquisition module, a judgment module, a determination module, a traceability module, a sorting module, an adjustment module and an early warning module. According to the method, multiple key data are collected, and candidate records seriously interfered by metal are rapidly screened out based on RFID phase variance; then, target records which are wrongly recognized and fail to check are determined through identity ambiguity and space-time conflict confidence; and finally, determining a risk sequence by adopting various data, ensuring that an early warning sequence is closely associated with an actual condition, adjusting preset parameters based on historical accuracy and an abnormal number, realizing accurate insight and active early warning of thermal power plant storage concealment registration errors, fundamentally ensuring the consistency of inventory accounts, and improving the accuracy of the thermal power plant storage concealment registration errors. The problems of risk early warning lagging and low identification accuracy caused by excessively depending on single static data are effectively solved.

The utility model discloses an interactive blowing type wind measuring device, and relates to the technical field of wind measuring devices. The device comprises a measurement box, a blowing nozzle is arranged on one side of the measurement box, a display screen is arranged on one side of the measurement box, a detection assembly is arranged in the measurement box, and the detection assembly comprises an airflow straight pipe fixedly connected in the measurement box. According to the utility model, the visual measurement box is constructed through the transparent acrylic material, a cooperative detection structure of the differential pressure sensor and the Venturi tube is combined, the teaching demonstration effect is significantly improved, the display screen is matched to display numerical wind speed data of differential pressure conversion in real time, and the honeycomb rectifier is matched with the stainless steel filter screen to realize accurate conversion from turbulent flow to laminar flow. The micro-airflow detection sensitivity is effectively improved, compared with a traditional mechanical anemograph, the detection precision is improved, the plug-pull type blowpipe assembly adopts a double-closed-ring sealing structure, the air tightness is guaranteed, quick disassembly and replacement can be achieved, and the requirement for repeated use by multiple persons is met.

The invention discloses a heat treatment process optimization method and system based on similarity matching and weighted fusion, and belongs to the technical field of material processing and artificial intelligence crossing. The method comprises the following steps: constructing a multi-dimensional feature vector containing material chemical components and target mechanical property indexes; obtaining related historical data through dynamic material expansion and validity judgment; utilizing a regression algorithm to calculate a feature dynamic weight, and further calculating a weighted Euclidean distance and similarity; selecting a preferable historical sample set according to the similarity, carrying out weighted fusion on the heat treatment process parameters by taking the similarity as a weight, and outputting a figure of merit and a range; the system also has a multi-target conflict judgment and correction mechanism. According to the method, the heat treatment process parameters are recommended reversely, accurately and interpretably according to the target performance, the problems that a traditional method depends on experience, the trial and error cost is high, the data utilization rate is low, and multi-target optimization is difficult to process are effectively solved, and the intelligent level and efficiency of process design are remarkably improved.

The utility model relates to printing equipment technical field, especially a galvanometer focal length height adjusting device, including the base mechanism that inside is provided with horizontal passage, the upper side wall of base mechanism is equipped in galvanometer mechanism, transmission mechanism is equipped in horizontal passage, transmission mechanism protrudes from the upper side wall and is connected with galvanometer mechanism. By setting the transmission mechanism, the horizontal movement in the first preset direction is converted into the vertical movement in the second preset direction, without involving the adjustment of optical lenses such as collimating lens group, avoiding the problem that the value of focused light beam M 2 changes due to the change of beam divergence angle in the prior art, ensuring the consistency of energy density after each laser focusing, and avoiding the poor printing quality caused by uneven energy from the root, in addition, directly adjusting the distance from the galvanometer mechanism to the working plane provides hardware support for the consistency adjustment of multiple laser focal heights, solving the problem of poor printing product quality caused by the difference in focal height plane during the cooperative work of multiple lasers.

The application relates to a parameter configuration method and device based on a measurement and control task and a computer device. The measurement and control task of a satellite measurement and control system is acquired, and a high-level task intention of the measurement and control task is accurately and reliably converted into a bottom-layer control instruction executable by the device. In this process, only parameters need to be adjusted in a high-level macro, and the parameters are automatically inherited to all subordinate satellites, so that repeated operations are avoided, parameter management complexity is reduced, dynamic parameter adaptation in a task execution process is realized, and flexibility is enhanced. Moreover, an independent macro does not need to be created in advance for each task, and a macro explosion problem is avoided. Through closed-loop verification, the reliability and controllability of measurement and control task execution are improved.

The present application relates to the technical field of instrument frequency conversion, and discloses an instrument frequency conversion method and system based on direct digital frequency synthesis, the method comprising: receiving a target frequency instruction and a reference clock signal, converting the target frequency instruction and the reference clock signal into a phase accumulation step length via a frequency tuning word; mapping a frequency spectrum relationship between the target frequency and a reference clock frequency to obtain a filter control parameter; generating a phase sequence according to the phase accumulation step length and the reference clock signal, and performing coordinate rotation vector iteration on a current phase value in the phase sequence to obtain a digital sinusoidal sequence; performing pulse amplitude modulation on the digital sinusoidal sequence to obtain a stepped analog signal; reconstructing a filter characteristic of the filter control parameter to obtain a current filter passband, and filtering out high-order harmonic and image frequency components in the stepped analog signal to obtain a pure analog signal; and the present application can improve the efficiency of instrument frequency conversion based on direct digital frequency synthesis.

The invention discloses an analog simulation system which does not need to depend on a large number of real electronic devices, effectively reduces research and development and test cost, can flexibly adapt to radar signal simulation and analysis requirements in different scenes, remarkably improves the efficiency and accuracy of radar signal emission, reconnaissance, receiving, acquisition and processing whole-process analog simulation, and improves the reliability of the system. And efficient and reliable technical support is provided for radar related equipment research and development, algorithm verification and personnel training.

This invention relates to a road congestion control method and system based on high-resolution remote sensing imagery, belonging to the field of traffic control technology. It addresses the technical problems of existing technologies, such as the limited coverage of ground-based sensing equipment and the low precision of traditional remote sensing techniques, which fail to fully extract the spatial details and texture features of high-resolution remote sensing images, thus failing to meet the requirements of refined road congestion control. The method involves acquiring high-resolution remote sensing images of urban road areas and preprocessing them; extracting road areas from the images and identifying traffic targets under the constraints of the road area images; calculating traffic flow parameters; constructing a congestion index calculation model to calculate the congestion index; classifying dynamic congestion levels based on the congestion index; and implementing road congestion control according to the dynamic congestion levels. This invention aims to achieve accurate and reliable road congestion control.