Abstract: The present disclosure provides a driver circuit, a driving method of the driver circuit, an array substrate and a display device, belonging to the field of display technology. The driver circuit provided by the present disclosure includes a logic control module, a data pin and at least two output pins. The data pin is configured to receive driving data. The logic control module is configured to generate driving control signals in a one-to-one correspondence with the at least two output pins according to the driving data. The driving control signals are configured to control the current flowing through the corresponding output pins.

Abstract: The present disclosure relates to a model training method and apparatus. The method includes: invoking a task segmentation thread to segment task data to obtain a plurality of consecutive slice data, and sequentially caching the slice data in a slice data queue; invoking a task distribution thread to read a slice data to be processed from the slice data queue and generating a task to be processed based on the slice data to be processed; and determining a target model trainer based on a task execution progress of each model trainer involved in model training, distributing the task to be processed to the target model trainer and instructing the target model trainer to execute the task to be processed.

Abstract: The present invention discloses a method for preparing glycollate by electro-catalyzing ethylene glycol or electro-catalytically reforming waste plastic polyethylene terephthalate (PET). The method for preparing glycollate by electro-catalytically reforming waste plastic PET includes: 1) dissolving the waste plastic PET into an alkali liquid, and carrying out solid-liquid separation after hydrolysis reaction to obtain an alkaline electrolyte containing ethylene glycol; and 2) assembling an anode catalyst, a cathode catalyst and the alkaline electrolyte containing the ethylene glycol into an electrolytic cell, and applying voltage for electrocatalytic reaction, where the ethylene glycol is oxidized at an anode to generate glycollate, and water is reduced at a cathode to generate hydrogen.

Abstract: A sweat extraction and monitoring system comprises a triboelectric nanogenerator (TENG) for inducing localized sweating for a human skin to generate sweat, iontophoresis electrodes electrically connected to the TENG and configured to be operably electrically contacting the human skin, at least one microfluidic channel for receiving the sweat, at least one biosensor for sensing the sweat received in the at least one microfluidic channel, and at least one sweat-activated battery configured to be actuatable by the sweat for powering the at least one biosensor.

Abstract: The present disclosure provides a data reading method and device for a database and storage medium, which includes: receiving a query condition for a Value column in an LSM-Tree database; querying first alternative data with Value meeting the query condition from the LSM-Tree database; constructing a right table according to Key of the first alternative data, taking total data in the LSM-Tree database as a left table, and carrying out Semi Join based on the left table and the right table, so as to acquire second alternative data matched with each Key of the right table from the left table; querying target data with Value meeting the query condition from the second alternative data. The present disclosure can realize a predicate pushdown function of an LSM-Tree database in Merge-On-Read scene, in which, a large amount of data scanning is avoided while write performance and query performance are balanced.

Abstract: The present disclosure provides a method and an apparatus of resource adjustment for a service cluster, an electronic device and a storage medium. The method includes: determining resource adjustment information for the service cluster according to a task quantity of streaming data processing tasks to be processed; determining a core quantity to be adjusted corresponding to central processor units and the second quantity of computing nodes to be adjusted, according to the parallelism degree to be adjusted, the first quantity of the computing nodes that have been created in the service cluster, and a resource utilization rate of central processor units in each computing node that has been created; and executing the resource adjustment operation according to the core quantity to be adjusted and the second quantity, and obtaining a service cluster subject to resource adjusting.

Abstract: A slow node detection method during task running, an apparatus, an electronic device, and a medium are provided.

Abstract: The present disclosure provides a method and an apparatus of resource adjustment for a service cluster, an electronic device and a storage medium. The method includes: determining resource adjustment information for the service cluster according to a task quantity of streaming data processing tasks to be processed; determining a core quantity to be adjusted corresponding to central processor units and the second quantity of computing nodes to be adjusted, according to the parallelism degree to be adjusted, the first quantity of the computing nodes that have been created in the service cluster, and a resource utilization rate of central processor units in each computing node that has been created; and executing the resource adjustment operation according to the core quantity to be adjusted and the second quantity, and obtaining a service cluster subject to resource adjusting.

Abstract: A service control method based on a service cluster, an electronic device, and a storage medium are described. The method includes: acquiring operation index information generated by a target service cluster when a task runs; calling one or more strategy models in a strategy model library to perform anomaly analysis on the operation index information, and determining target anomaly information of an anomaly occurring in the target service cluster when the task runs and a corresponding target solution strategy; and sending a configuration updating indication carrying the target solution strategy to the target service cluster.

Abstract: The present disclosure provides a driver circuit, a driving method of the driver circuit, an array substrate and a display device, belonging to the field of display technology. The driver circuit provided by the present disclosure includes a logic control module, a data pin and at least two output pins. The data pin is configured to receive driving data. The logic control module is configured to generate driving control signals in a one-to-one correspondence with the at least two output pins according to the driving data. The driving control signals are configured to control the current flowing through the corresponding output pins.

Abstract: The present disclosure relates to a data processing method, a medium and an electronic device for a database. The method includes: obtaining a first execution statement for performing a target operation; reading, when a data source corresponding to the first execution statement includes first data corresponding to a committed transaction and second data corresponding to an uncommitted transaction, a materialized view obtained after performing the target operation on the first data as a target materialized view from a pre-created materialized view set; reading the second data and performing the target operation on the second data to obtain operation result data; performing data merging processing on the target materialized view and the operation result data to obtain merged data; and performing the target operation on the merged data to obtain an execution result corresponding to the first execution statement.

Abstract: An intermediate car electric coupler control circuit for a subway vehicle includes a coupling state relay, a power supply circuit for a decoupling electromagnetic valve, a first power supply circuit for an electric coupler control relay, a second power supply circuit for an air path and electric coupler module control electromagnetic valve, and a third power supply circuit for a bus control contactor. A coupler coupling operation is performed exactly according to a sequence of a mechanical coupling, an air path conduction, an electric coupler extension, and a medium- and low-voltage bus closing, wherein contacts of electric couplers are prevented from being damaged. A coupler decoupling operation is performed exactly according to a sequence of a contact heavy-current removal, an electric coupler withdrawal, an air path disconnection and a mechanical decoupling, wherein the contacts are prevented from being damaged by a heavy current arcing and a discharge.

Abstract: The present disclosure provides a database-based data query method, an apparatus, an electronic device and a storage medium. The method includes: receiving a data query request; determining a plurality of search strategies that match target data as indicated by the data query request; for each search strategy, querying a data selection rate stored in association with the search strategy from a cache, wherein the data selection rate stored in the cache is determined based on real selection rates obtained from multiple historical data queries; in response to an existence of the data selection rate stored in association with the search strategy, taking the data selection rate as a target selection rate corresponding to the search strategy; and determining a target search strategy based on the target selection rate corresponding to respective search strategy, wherein the target data is obtained from a database based on the target search strategy.

Abstract: This disclosure provides a query task execution method, apparatus, computer device, storage medium. The method includes: receiving a query task for a target data table; determining at least one candidate degree of parallelism for executing the query task based on a first number of child tables obtained by pre-partitioning the target data table; selecting a target degree of parallelism within a preset range of degrees of parallelism from the at least one candidate degree of parallelism; and determining required computing units according to the target degree of parallelism, and evenly allocating the child tables to the computing units which concurrently execute the query task based on the allocated child tables.

Abstract: The present disclosure relates to a database-based data processing method, device, medium, and apparatus, the method including: receiving a target query statement; determining a corresponding target materialized view for executing the target query statement according to a data query time corresponding to the target query statement and a time granularity of the materialized view in a database, wherein the database is constructed with the materialized view at different time granularities; rewriting the target query statement according to the time granularity of the target materialized view to obtain a plurality of target sub-query statements, wherein the target sub-query statements include sub-query statements which are queried based on the target materialized view; and merging the target sub-query statements, and performing a data query according to a query statement obtained by merging.

Abstract: There are provided a method, device, and storage medium for processing a data table. The method includes: performing an equivalent join on a left table and a right table in two data tables that are to be joined by a hash join, and acquiring first associated data of an association between the left table and the right table; filtering the first associated data according to a predetermined non-equivalent filtering condition, and determining second associated data satisfying the predetermined non-equivalent filtering condition in the first associated data; identifying, in a predetermined data structure according to a target join type of the two data tables; and processing the left table and/or the right table according to the target join type of the two data tables and the predetermined data structure to generate a target join table.

Abstract: The present disclosure describes hybrid transactional and analytical processing (HTAP) techniques. A HTAP system comprises a first processing engine configured to perform online transactional processing, a second processing engine configured to perform online analytical processing, and a storage in communication with the first processing engine and the second processing engine. The first processing engine, the second processing engine, and the storage may be modularized and configured to be decoupled from each other. The system may be configured to capture data by the first processing engine in real time, organize the data in a first format in a first part of the storage for use by the first processing engine, propagate the data to a second part of the storage subsystem, and organize the data in a second format in the second part of the storage for use by the second processing engine.

Abstract: A backplane and a glass-based circuit board. The backplane includes: a base substrate and a plurality of light-emitting units, arranged in an array on the base substrate. Each of the light-emitting units includes at least one light-emitting sub-unit; the light-emitting sub-unit includes a connection line and a plurality of light-emitting diode chips connected with the connection line, and the light-emitting diode chips are located on a side of the connection line away from the base substrate. The connection line includes a first connection portion, a second connection portion and a third connection portion; in each of the light-emitting sub-units, the third connection portion includes a plurality of connection sub-portions, each of the connection sub-portions includes at least one electrical contact point; the electrical contact points at adjacent ends of adjacent connection sub-portions constitute an electrical contact point pair.

Abstract: A parking brake control method for an electromechanical brake system of an urban rail vehicle includes an operation instruction mechanism, a brake control mechanism, an electromechanical actuating mechanism and an auxiliary mechanism. The operation instruction mechanism outputs a control signal to the brake control mechanism to drive the action of the electromechanical actuating mechanism so as to achieve braking application and relief of the vehicle. The auxiliary mechanism is used for a redundant power supply system of a brake system. The auxiliary mechanism further includes a zero-speed state monitoring mechanism for monitoring a zero-speed state of the vehicle and an energy storage battery mechanism for providing a backup power supply. The parking brake control method enables an urban rail vehicle using an electromechanical brake system to achieve brake application and relief in a parked state and achieve brake application and relief in a dormant state of the urban rail vehicle.

Abstract: A beam tracking method and apparatus, describes that, during vehicle platooning, following vehicles have a low reliability of receiving a beam signal and a low speed of discovering a beam signal. Said method includes: receiving first position information of a designated vehicle obtaining, on the basis of the first position information and second position information of a following vehicle, relative position information of the designated vehicle and the following vehicle; and tracking, according to the relative position information, a beam transmitted by the designated vehicle.