7 results about "Linear dynamical system" patented technology

Koopman operator theory is a widely used method to analyze, control, and predict the behavior of the states of a non-linear dynamical system using measurement functions in Hilbert space. Real time approximation of the Koopman operator is crucial in order to adapt and understand behavior of underlying non-linear dynamical system. Traditional approaches leverage matrix-based methods or artificial neural networks to approximate Koopman operator. However, such methods necessitate significant power and computational resources, therefore may not be suitable for applications that require real-time on-board processing. The problems of the conventional approaches are resolved based on a recent development of brain inspired spiking neural networks and neuromorphic computing platforms, as these offer extremely low-energy computation and real-time responses. Embodiments of the present disclosure provide implementation of a Spiking Neural Network (SNN) based architecture that efficiently approximate Koopman operator with minimal length of data and demonstrates significant computational savings.

The present application relates to a kind of 3D medical image mask self-encoding methods based on Mamba, to optimize the self-encoding task of processing 3D medical image, especially solve the problem of high memory requirement and computing resource consumption encountered when processing long sequence data.The Mamba network architecture introduced in the present application is used as the backbone network of the self-encoding model, to optimize the ability of the model to process long sequence data.Mamba is an advanced architecture based on state space model, which combines linear dynamic system theory and neural network concepts, effectively capturing the timing information and dynamic characteristics in the data.The core advantages of the present application include selective scanning algorithm, hardware-aware algorithm, and efficient data processing capability, especially when processing long sequence data.The present application not only reduces the burden of computing and storage, but also maintains or improves the accuracy and efficiency of image processing, especially suitable for processing 3D medical image data that requires a large amount of computation and high memory bandwidth.

The present application relates to the technical field of intelligent sensing and emotion computing, in particular to an end-to-end emotion recognition method and system based on a seat cushion pressure sensor array, which collects human sitting posture pressure distribution time series signals through a seat cushion pressure sensor array, obtains a standardized time series tensor through quality exploration, sliding window slicing and standardization processing; uses a pre-trained multi-scale spatiotemporal feature extraction network to extract emotion-related pressure spatiotemporal features, which are input into a multi-layer perceptron classifier after running normalization and linear dynamic system smoothing to output emotion categories. The system includes a pressure data acquisition module, a data preprocessing module, a multi-scale spatiotemporal feature extraction module, a feature post-processing module and an emotion classification output module. Through comparative learning pre-training and multi-scale spatiotemporal feature mining, the present application improves the cross-subject generalization ability and recognition stability, and realizes end-to-end direct recognition from original pressure signals to multi-category emotions.

The application discloses an industrial system mechanism modeling simulation platform, a unified system modeling simulation code system is constructed based on a Python language, a system identification model function library is constructed based on AI technology, and a dynamic model of a complex industrial system or equipment is identified through industrial big data; a general system modeling simulation environment is provided, a linear dynamic system and an artificial intelligence nonlinear dynamic model are incorporated into a unified modeling simulation system, visual combination modeling and industrial system simulation are carried out, and identification modeling simulation integration is supported; and the application is used for industrial system identification modeling simulation technology required by industrial internet and industrial intelligent construction, and provides a reliable system model for design of a high-end controller.

The invention discloses a depth Koopman modeling method and system fused with differential quadratic programming, and the method comprises the steps: collecting and processing the historical operation data, state data and input data of a nonlinear dynamic system, and dividing the data into a training set and a verification set; a depth Koopman modeling framework integrated with a differentiable quadratic programming layer is constructed; and training the modeling framework by using a historical operation data set, and optimizing to-be-trained parameters through training to finally obtain a dimension raising mapping function of the modeled nonlinear dynamic system and an optimal high-dimensional global linear dynamic model corresponding to the function. According to the method, the dimension raising mapping function can be automatically learned and optimized, and the current optimal high-dimensional global linear dynamic model is calculated in real time by utilizing the differentiable programming layer in the learning process, so that the manual selection process of the dimension raising mapping function with subjectivity and blindness is avoided; and the optimality of the obtained high-dimensional global linear dynamic model can be effectively ensured. Therefore, the modeling precision of the method is effectively improved.

The invention discloses an FMCW laser ranging light source spectrum degradation suppression method based on strategy online deployment. Belongs to the laser radar field. The objective of the invention is to solve the technical problems of spectrum degradation and measurement precision reduction caused by frequency modulation nonlinearity of an FMCW laser ranging light source. Comprising the following steps: building an FMCW laser nonlinear dynamic system platform, and constructing a deep learning model to simulate a dynamic environment; designing a nonlinear correction process as a Markov decision process, and training a reinforcement learning agent by using a TD3 algorithm; carrying out lightweight processing on an Actor network in the policy network, wherein the lightweight processing comprises pruning and quantization operations so as to reduce the complexity of the model; a lightweight strategy network is deployed on a hardware platform, strategy network forward reasoning is achieved on an FPGA, the strategy network is cascaded with a state extraction module and an action output module to form a closed-loop correction system, and dynamic modulation current optimization is achieved. According to the invention, frequency spectrum degradation caused by frequency modulation nonlinearity can be inhibited on line, and the measurement precision is improved.

The application relates to the technical field of nonlinear dynamic system fault diagnosis, in particular to a nonlinear dynamic system fault diagnosis method and device based on a mask attention subspace model. The method comprises the following steps: a subspace coding-decoding model is constructed, wherein the encoder serves as a state estimator, and the decoder serves as an output estimator; a mask attention layer is introduced into the encoder, and the attention range is constrained through an inter-neighbor mask module; a trained MAS-Net model is used to calculate residual signals and T2 statistics of test samples; a fault detection threshold is determined based on kernel density estimation, so that fault detection is realized; and fault variable identification and isolation are realized by analyzing the differences in attention weight under normal and fault states. The application solves the problems that traditional subspace identification methods are difficult to extract long-distance dependent features and have poor fault variable interpretability, can effectively process high-dimensional, nonlinear and strongly coupled industrial data, and simultaneously realizes high-precision fault detection and interpretable fault isolation.