43results about How to "Avoid the "curse of dimensionality" problem" patented technology

The invention provides a cross-view gait recognition method based on tensor simultaneous discriminant analysis, which includes constructing Gabor representation-based gait features, online model training and offline testing. The method of the present invention not only uses the idea of ​​coupling metric learning to weaken the heterogeneous problem of data under cross-view angles, but also combines the idea of ​​tensor gait features and tensor discriminant analysis based on Gabor representation to improve the classification of gaits performance and avoid the small sample problem caused by too few samples.

The invention relates to the field of reservoir scheduling and discloses an orthogonal successive approximation algorithm based reservoir scheduling method. The reservoir scheduling method includes the steps: firstly, determining number of reservoirs, and adopting the orthogonal successive approximation algorithm for calculation if one reservoir is available; otherwise, setting scattering-state step length and scattering number and selecting a proper orthogonal table according to the number of the reservoirs and number of scattering states; determining initial reservoir scheduling trajectories involved in optimal calculation; resolving the original reservoir optimal scheduling problem into multiple subproblems by the successive approximation algorithm; calculating each state combination and performing statistic analysis by a penalty function method according to reservoir condition combination evenly distributed in a constraint space of an orthogonal table structure, and rapidly acquiring the optimal state combination of the subproblems; performing the optimal calculation on the subproblems in sequence, and successively approximating an optimal solution of the original problem. By the application of the reservoir scheduling method, calculation dimensions of the reservoir optimal scheduling problems can be lowered, calculation efficiency can be improved, and the reservoir scheduling method is applicable to a single-reservoir optimal scheduling and group-reservoir optimal scheduling as well as water resource optimal allocation.

A simulation method of isolating knife switch in power grid topology. In the operation of the power grid, the role of the isolating knife switch is to form an obvious "breakpoint" in the switching operation, which is indispensable for forming a safe area in the power grid operation It does not participate in the "arc extinguishing" of the circuit during breaking or closing, and the isolation switch is often set in conjunction with the circuit breaker. Based on these actual characteristics, the isolation switch can be used in the construction of the power grid simulation model. The switch is considered based on the circuit breaker, so that the power grid simulation model does not include the isolation switch in the topology, but because it is considered based on the circuit breaker, it does not affect the realization of the "five-proof locking" function of the grid switching operation of the simulation system. The characteristic of this method is that it solves the "curse of dimensionality" problem caused by the isolation switch in the construction of the power grid simulation model according to the actual situation of power grid operation.

The invention provides a modeling method for power system transient state stability assessment. The method includes the following steps that power generator track information and a transient state calculation result are collected; a feature value of a power generator is calculated; an initial mathematic model X and a transient state stability assessment mathematic model F are formed; dimensionality reduction is conducted on the transient state stability assessment mathematic model F to obtain a two-dimensional standard mathematic model D. Multidimensional counting is conducted on power generator track curves, a statistic curve can reflect main mean values, change ranges and change rate features of each track curve, statistic features are irrelevant to the scale of a system, the dimensionality curse problem caused by increasing of an analysis system in the data modeling process can be effectively avoided, and meanwhile adverse of power generator information loss on calculation can be reduced to the largest extent.