39 results about "Optimal criterion" patented technology

The invention discloses an OFDM relay network resource allocating method based on the information-and-energy-simultaneous-wireless-transmission. This method constructs an optimization model for the system throughput under the condition that the peak power of a source node is restricted, the peak power of each subcarrier is restricted and the energy causality of the relay node is restricted. In the case that the subcarrier allocation strategy of the source node is given, the optimal criteria for the original problem are sought. Then, through the arrangement of the general energy transmission power of the source node, the original problem is decoupled as two separate sub-problems of the maximization of the throughput, which reduces the complexity of the original problem for solutions considerably. The decoupled sub-problems are then solved according to a water injection manner. Finally, the invention provides four subcarrier allocation schemes, referred to as the energy optimizing scheme, the information optimizing scheme, the equilibrium allocation scheme and the exhaustion scheme with the first three schemes reducing the complexity of the sub-carrier allocation significantly.

A method for computer-supported control and / or regulation of a technical system is provided. In the method a reinforcing learning method and an artificial neuronal network are used. In a preferred embodiment, parallel feed-forward networks are connected together such that the global architecture meets an optimal criterion. The network thus approximates the observed benefits as predictor for the expected benefits. In this manner, actual observations are used in an optimal manner to determine a quality function. The quality function obtained intrinsically from the network provides the optimal action selection rule for the given control problem. The method may be applied to any technical system for regulation or control. A preferred field of application is the regulation or control of turbines, in particular a gas turbine.

The invention discloses a lithium iron phosphate cell lifetime prediction method based on MIV and an SVM model. The method comprises steps of by applying the MIV algorithm, obtaining the influence importance degree of an input variable to an output variable; then, screening out the most important variable to serve as the input variable; preventing unimportant independent variables to be introducedinto training and test processes of the prediction model; after variable optimization, obtaining a new training set and a new test set only including the optimal variables; and by use of the optimaltraining set and the SVM, carrying out training to obtain the prediction model. According to the invention, the structural risk minimization is used as the optimal criterion in the SVM, so the globaloptimal solution can be acquired; and by combining the prediction model which is subjected to the optimization, only includes variables of circulation times, resistance and the like and is obtained through training, prediction efficiency and prediction precision can be effectively improved.

The invention discloses a particle reinforced material component robust topological optimization method by considering mixing uncertainty. The method comprises the following steps: considering uncertainty of a component using a particle reinforced material in manufacturing and use, regarding an insufficient external load of a sample as interval uncertainty, and regarding sufficient matrix and particle material attributes of the sample and volume distribution of a particle reinforced phase in the matrix as bounded probability uncertainty; discretizing the volume distribution of the design domain and the particle reinforced phase, setting physical and geometric constraints, and establishing a robust topological optimization design model; and iteratively solving the robust optimization designmodel considering the interval and bounded probability mixed uncertainty by using an optimal criterion method. The component steady topological optimization design model established by adopting the method truly reflects the distribution characteristics of multi-source uncertainty in actual engineering, and the proposed structural performance statistical moment estimation method and the optimal criterion method are used for solving, so that the optimization result can be efficiently obtained, and the method has a very good engineering application value.

The invention discloses a selection method of a cognitive network path. The method comprises the following steps: a secondary user source node, a secondary user relay node and a secondary user destination node respectively obtaining various parameters required for analyzing outageperformance of the cognitive network under mutual interference scene of a primary userand a secondary user, establishing an outage probability closed form expression of any one path in a cognitive relay network under a Rayleigh fading channel in combination withinterference limitation allowed by a primary user receiver end, selecting an optimal path of information transmission from a source node to the destination node in the network according to the optimal criterion of system end-to-end outage performance, and selecting a network path by using minimum standard of the cognitive network outage probability. The technical scheme disclosed by the invention gives full consideration to interference factors of the primary user to the secondary user in the cognitive network path selection and takes corresponding measures so as to improve the reasonability of timely selecting the cognitive network path.

A method for combined computed tomography (CT) imaging and positron emission tomography (PET) imaging uses respiration-gated CT imaging in which the optimal criteria for CT scan gating are determined after the PET scan has been performed. After acquisition of first CT scan image data and PET scan image data with strain gauge levels being recorded, optimal gating criteria are calculated based on the strain gauge levels, and a second CT scan is then performed with triggering in accordance with the optimal gating criteria.

The invention provides a calculation method of function sizes of part hole series. The method comprises the steps of measuring and obtaining measuring point coordinates on various measured holes, obtaining ideal positions of the holes according to drawing information, converting into a function size of a circle for calculation through coordinate translation, applying a method for solving a nonlinear equation system, changing the diameter of a function surface continuously till a criterion is met, and outputting the function sizes of the hole series and position coordinates of the holes. The method can accurately calculate optimal criterion meeting values of the function sizes of the hole series and the position coordinates of the holes.

The invention discloses a method for improving the overall pose accuracy of components by optimizing and constructing measurement points. According to the coordinates of the measurement points on the components before the posture adjustment and positioning and the coordinates after the posture adjustment and positioning, firstly by constructing effective criteria, Eliminate the points that do not meet the criteria to form valid measurement points, and then, by constructing a transformation matrix, match the components at the initial position and their valid measurement points to the target position, and obtain the construction points of the valid measurement points on the components at the target position and its coordinates. By constructing the optimal criterion, the optimal effective measurement points are obtained from the construction points, and the correction transformation matrix is ​​constructed again for the optimal effective measurement points, and the components at the initial position and the optimal effective measurement points at the initial position are corrected and matched to the target position through the correction transformation matrix, Obtain the corrected construction point and its coordinates of the preferred valid measurement point on the component at the target location.

The invention discloses a power distribution algorithm for a UAV relay system based on an optimal energy efficiency criterion. First, on the basis of a double-hop amplifying and forwarding relay transmission model, an optimal model for power distribution is established, and the power distribution problem is transformed into Solve an optimization problem for maximum system energy efficiency. In the process of solving the optimal power allocation, we first fix the transmitted signal power to obtain the beamforming optimization scheme; then, through the interval approximation of the large signal-to-noise ratio, the original non-convex optimization problem is transformed into a convex optimization problem; finally, using the KKT condition, The calculation yields the closed-form solution for the power distribution scheme. Simulation experiments show that the closed-form solution obtained by the algorithm disclosed in the present invention is close to the loop iteration method, thereby reducing the complexity of the algorithm.

The invention discloses a high-performance material optimal selection method suitable for a space debris protection structure. The method comprises the following steps: a, selecting a protective material, and looking up a table to obtain the Hugoniot and thermodynamic parameters of the material; and b, screening the protective material according to an impact pressure criterion, an internal energyconversion criterion, a minimum thickness criterion and a kinetic energy absorption criterion to obtain a preferred material. In the present invention, the protection mechanism of the protective material under the ultrahigh-speed impact effect is deeply analyzed; the mechanical and thermodynamic characteristics of the protective material are comprehensively considered; the impact pressure, the internal energy conversion, the minimum thickness and the kinetic energy absorption characteristic of the protective material are used as optimal criteria; in combination with a performance coefficient model capable of quantitatively characterizing wave impedance characteristics and thermodynamic characteristics of the protective material, the high-performance material optimal selection method suitable for the space debris protection structure is obtained, optimal selection of various protection materials can be achieved, the test cost for material selection is effectively reduced, and theoretical guidance can be provided for design and preparation of novel high-performance protection materials.

The invention provides a method and a device for acquiring thermal extrusion technological parameters of a nickel base alloy tube stock. The method comprises the following steps: performing numerical simulation analysis for a thermal extrusion process of a tube blank on a thermal extrusion model, thereby acquiring an optimal criterion data of the tube blank under multiple sets of different thermal extrusion technological parameter alternative data; constructing a relation curve between each thermal extrusion technological parameter and the optimal criterion data and confirming a value interval of the thermal extrusion technological parameter corresponding to each optimal criterion datum according to the relation curve and a preset criterion selection condition; performing intersection treatment on the value intervals of the same thermal extrusion technological parameter corresponding to all the optimal criterion data, thereby acquiring optimal values of the thermal extrusion technological parameters. According to the invention, multiple technological parameters of the nickel base alloy tube stock in a thermal extrusion process can be more accurately acquired and the practical production can be more effectively guided.