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95 results about "Change weight" patented technology

Hyperspectral remote sensing classification method based on support vector machine under particle optimization

The invention discloses a hyperspectral remote sensing classification method based on support vector machine under particle optimization. High-efficiency high-accuracy classification of hyperspectral data which are high in data dimension and large in data volume can not be met by existing methods, and no ideal selection method is provided for parameters of a support vector machine method. According to the method, hyperspectral data is preprocessed, abnormal wave bands are removed under the influence of factors such as atmospheric absorption, then a certain proportion of data of various types are selected at random to serve as training data, a Gauss radical basis function is selected to serve as a kernel function mode, a classifier based on the support vector machine is trained, a speed updating formula of changing weight is designed, a certain proportion of particle mutation is guaranteed, an optimal classifier parameter is selected and obtained according to a particle swarm optimization algorithm, a plurality of second classifiers are trained, and a type which wins most votes is selected to be a final predicted type of data points according to a voting mode. According to the method, parameter optimization convergence ability of the classifier is strengthened, and the classification performance of hyperspectral remote sensing images is improved.
Owner:HANGZHOU DIANZI UNIV

Regression testing case set construction method based on program change

The invention discloses a regression testing case set construction method based on program change, comprising the following steps of: (1) determining the program change of a target software version relative to a historical version; (2) dividing the program statements of the historical version into a change statement set and a non-change statement set, and simultaneously setting a change weight; (3) dividing testing case sets according to historical overlaying information; (4) simplifying the divided change overlaying set and common overlaying set; and (5) seqencing the testing cases in the change overlaying set and the common overlaying set, and simultaneously merging the two sets to form the regression testing case set of the target version. The regression testing case set construction method based on program change can be widely applied to automatic tests and regression tests of a large-sized software system in the updating process; the historical test information and the program change data of the target version are used fully and the constructed regression testing case set has good pertinence; and the regression testing case set construction method based on program change is capable of completing high-efficiency software tests in limited test time and at limited cost.
Owner:NANJING UNIV

Quantitative analysis method for collected footprints by three-dimensional observation system

The invention relates to a quantitative analysis method for collected footprints by a three-dimensional observation system, which comprises the following steps of: inputting SPS (Symbolic Programming System) data according to the designed plan of the three-dimensional observation system and calculating the energy change weight coefficient value W of each surface element in the three-dimensional observation system; carrying out qualitative analysis on the collected footprints by the three-dimensional observation system according to value W distribution of all surface elements; carrying out quantitative analysis on the collected footprints by the three-dimensional observation system by calculating and analyzing difference, mean value and mean square error value of the values W of all surface elements; and comparatively selecting the designed plan of the three-dimensional observation system with smallest collected footprint. The invention can be used for carrying out qualitative and quantitative analysis on the collected footprints caused by the three-dimensional observation system and quantitatively comparing the performance difference before and after change of the three-dimensional observation system so that the collected footprints are minimized in the design stage of the observation system, thereby ensuring the accuracy and continuity of the sectional amplitude and providingguarantee for improving the forecast of reservoir stratum, oil pool description and AVO(earthquake amplitude and phase relationship) research precision.
Owner:CHINA PETROCHEMICAL CORP +1

Magnetic control type full-angle-feeding three-product heavy medium cyclone

The invention relates to a magnetic control type full-angle-feeding three-product heavy medium cyclone, belonging to the technical field of coal separation equipment. The heavy medium cyclone comprises a cyclone cylinder and a magnetic control device, wherein the magnetic control device is arranged on the cyclone cylinder and is used for changing weight medium distribution of to-be-separated materials in the cyclone cylinder by virtue of magnetic force traction; the magnetic control device comprises an internal magnetic system and an external magnetic system which are respectively arranged on the inner side and outer side of the cyclone cylinder, and the internal magnetic system and the external magnetic system are respectively electrified to control the magnetic force. The heavy medium cyclone has the beneficial effects that after materials are fed into the cyclone cylinder, traction forces are generated to heavy mediums by virtue of the magnetic forces of the internal and external magnetic systems of the magnetic control device, so that the distribution of the heavy mediums is regulated, the materials are effectively dispersed, and elimination of blockage is facilitated; the stability of suspension liquid is controlled, and the separation time is regulated and controlled; the distribution of separation layers of the heavy mediums is changed, the loss of clean coal is reduced, the yield of the clean coal is improved, a coarse size phenomenon is reduced, and the quality of the clean coal is improved; by arranging a flow guide device, the materials and the medium suspension liquid can be fed in batch along a 360-degree annular direction, so as to realize batch washing selection.
Owner:ANHUI UNIV OF SCI & TECH
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