5 results about "Computer database" patented technology

The invention discloses a semi-physical closed-loop test system and method for an optical tracking and aiming single machine. The test system comprises the optical tracking and aiming single machine, a satellite-borne control computer, a dynamics simulator, an optical tracking and aiming single machine simulator, an analog data management computer, a telemetering display terminal computer, a database and a power supply. The testing method comprises the following steps: constructing a semi-physical closed-loop testing system, operating ground equipment and a satellite-borne control computer, outputting measurement data by the optical tracking and aiming single machine, accessing the measurement data of the optical tracking and aiming single machine to the semi-physical closed-loop testing system, and evaluating the performance of the closed-loop semi-physical testing method of the optical tracking and aiming single machine. According to the invention, the optical tracking and aiming single-machine simulator is used to verify the effectiveness of the function of the single-machine internal algorithm; meanwhile, stand-alone data are accessed to a closed loop of the control system, and the performance and robustness of the control system are fully tested.

The invention discloses RP-3 medium high and low pressure automatic test equipment and an automatic test method, and the equipment comprises an integrated test unit which is used for carrying out a 0-5 bar low pressure test, a 5-30 bar medium pressure test and a 30-600 bar high pressure test by using an RP-3 medium and comprises a pressure adjustment module; the control unit is respectively connected with the integrated test unit and the upper computer database and is used for receiving test related instructions and parameters and controlling the operation of the integrated test unit; the pressure feedback unit is respectively connected with the integrated test unit and the control unit and is used for acquiring a pressure signal and feeding back the pressure signal to the control unit; and the anti-explosion thermal management unit is used for regulating and controlling the oil temperature and the gas temperature in the equipment in the testing process. According to some embodiments of the invention, by arranging the integrated test unit integrating low, middle and high pressure tests, the control unit connected with the upper computer database, the pressure feedback unit and the anti-explosion thermal management unit, integrated automatic test can be realized in a large pressure range, and the test precision and efficiency are improved.

A combined vacuum power gas source system is composed of a gas ring type vacuum pump, an oil-free dry type vacuum pump, a flow regulating valve and a connecting pipe section which are connected in parallel, a plurality of groups of sonic nozzles with throat diameters gradually increased in an equal difference mode are evenly distributed in a horizontal stagnation container, and a stable flow field is formed by combining a corrugated pipe expansion joint. The detection pipeline system is coaxially connected with a detected meter through a pipe section support fixing straight pipe section, the meter clamping device clamps the detected meter, the automatic detection system collects stagnation pressure and temperature data in real time, flow error analysis and report generation are achieved through a notebook computer database, and the wide-range stable gas supply device has the advantages that wide-range stable gas supply is achieved; the back pressure ratio can be accurately controlled to be 0.5-0.75, and automatic switching of multiple flow points is supported; the device can complete online calibration of the gas flowmeter under the condition that production is not affected, and is suitable for flow metering verification requirements under complex working conditions in industries such as petroleum and chemical engineering.

The application provides an index determination method and device for a database query scenario, equipment and a medium, relating to the technical field of computer databases. The method comprises: obtaining a target query statement and at least two target data tables corresponding to the target query statement, performing feature extraction on the target query statement and the target data tables respectively to obtain target query features and target table structure features; performing aggregation processing on each target data table to obtain target aggregation features representing the association between at least two target data tables; inputting the target query features, target table structure features and target aggregation features into an index determination model to obtain a target index scheme, and performing database query according to the target index scheme to obtain a target query result. The above method can improve the accuracy of the index scheme.

The application belongs to the technical field of data encryption, and discloses a data encryption algorithm and system for a computer, which comprises a data acquisition module, a main control module, a secret key generation module, an encryption module, a data verification module, a secret key management module, a security evaluation module and a display module. Different computer data verification processes are adopted for different computer data verification types in the source computer database and the target computer database through the data verification module, and the full amount of computer data is verified through the traversal mode, so that the accuracy of computer data verification is improved. Meanwhile, the security of the computer data secret key is effectively improved through the secret key management module. Moreover, the management method of the application does not need to bind other external hardware devices, and the management cost of the computer data secret key is reduced.