607 results about "Isotropy" patented technology

The invention discloses an efficient 3D Gaussian scene reconstruction method based on multi-modal depth distribution supervision, and compared with the prior art, pixel-level depth dense point clouds are directly extracted in a Gaussian initialization stage, a multi-modal depth distribution map is generated, random initialization of dense Gaussian positions according to COLMAP sparse point clouds is effectively avoided, and the reconstruction efficiency is improved. The problems that under the condition of few views, point clouds obtained by COLMAP are too sparse, provided geometric constraints are insufficient, and meanwhile randomly initialized Gaussian blocks the point clouds to move to the correct position due to the local minimum value are solved. According to the method, an image segmentation algorithm based on edge detection is applied to the image frame, a large number of Gaussian primitives which are far away from edge points and are similar in depth are fused, the 3D Gaussian number is effectively pruned, and memory consumption of a GPU is saved. According to the method, extra isotropic regularization loss is introduced into global gauss, so that the problem of Gaussian distribution in which artifacts are generated along the line-of-sight direction and the height is lengthened is avoided.

The invention provides a preparation method of an isotropic Ti2AlNb / TiAl-based interpenetrating composite material, and belongs to the technical field of intermetallic compound-based composite materials. The method comprises the following steps: firstly, designing a Ti2AlNb reinforcement framework of various TPMS configurations by utilizing implicit function modeling; then, carrying out anisotropy research on the TPMS configuration by utilizing finite element simulation; secondly, a Ti2AlNb reinforcement framework of a TPMS configuration is prepared through a selective laser melting (SLM) technology; and finally, the TPMS configuration Ti2AlNb / TiAl-based interpenetrating composite material is prepared through vacuum hot pressing sintering of HPS. Therefore, strong anisotropy of a traditional fiber reinforced composite material in mechanical property is avoided, good matching of strength, plasticity and toughness of the composite material is achieved, and a new thought and a new solution are provided for breaking through the application bottleneck of TiAl in spaceflight power system hot end components.

The invention provides a magnetic resonance image self-supervision super-resolution reconstruction method and system based on a prior guide diffusion model. The method comprises the steps of image preprocessing, pseudo-pairing data set construction, prior condition construction, model training, model testing and three-dimensional isotropic volume reconstruction. According to the method, the dependence on a real high-resolution image is remarkably reduced by constructing a self-supervised pseudo-pairing mechanism, and high-quality reconstruction from anisotropic MRI to an isotropic image is realized; meanwhile, by introducing multiple medical priori including high-frequency residual, edge structure and region-of-interest guidance, detail retention and structural boundary definition of the image are effectively improved, the convergence speed and robustness of the model are improved while anatomical fidelity is guaranteed, and the method is suitable for large-scale popularization and application. And a technically feasible and clinically applicable solution is provided for high-resolution reconstruction of medical images.

The invention relates to the technical field of laser processing devices, in particular to a device and method for achieving three-dimensional isotropic processing through a rotating slit. The three-dimensional motion platform is used for placing and driving a transparent material to be processed; the slit is provided with a driver to enable the slit to rotate, laser beams emitted by the laser emitting device are subjected to light path adjustment and then pass through the center of the slit to form elliptical light beams, and the elliptical light beams are focused by an objective lens and then are transmitted to the laser receiving device. The three-dimensional isotropic processing of the transparent material is realized by adjusting the rotating speed of the slit and the direct writing speed of the three-dimensional motion platform; according to the invention, the rotatable slit is arranged, a circular Gaussian beam emitted by the laser emitting device passes through the slit to form an elliptical beam, the elliptical beam is rapidly rotated by rapidly rotating the slit, and after the elliptical beam is focused by the objective lens, spatial three-dimensional spherical symmetrical focal field distribution can be obtained in the transparent material, so that three-dimensional isotropic processing is realized.

The invention provides a rapid self-driven anti-icing material and a preparation method thereof. The rapid self-driven anti-icing material comprises a modulus span formed by at least two materials, a Z-axis perpendicular to a substrate direction, and an upper'hard (high-modulus material) 'structure and a lower'soft (low-modulus material)' structure distributed along the Z-axis direction, the surface of the large-area rapid self-driven anti-icing material is provided with a microstructure (micron-scale or nano-scale, continuous or discontinuous, isotropic or anisotropic wrinkles, micro-columns, grooves, inverted triangular bulges and the like). And the surface has an isotropic continuous wrinkle structure (figures), and has modulus span (hard at the upper part and soft at the lower part) in the Z-axis direction. The material can realize zero-energy-consumption deicing (only under the action of self gravity of ice deposits or wind power) without depending on a lubricating layer.

The invention relates to a glioma radiotherapy effect prediction method based on habitat analysis imageomics, and belongs to the technical field of medical image artificial intelligence and tumor radiotherapy, and the method comprises the steps: collecting a multi-mode MRI image, a radiotherapy plan computed tomography CT image, a dose image and a local recurrence label before postoperative radiotherapy, and converting the images into a standard format; sequentially performing craniocerebral boning processing, N4 bias field correction, isotropic resampling, gray level normalization processing and image registration on the acquired image to obtain a preprocessed image; based on the planned target volume PTV, dividing the interior of the PTV into three types of physiological structure habitat areas and three types of physiological habitat areas; image omics features of the multi-mode MRI images are extracted in the PTV and all habitat areas, and an optimal feature subset is screened out; taking the screened optimal feature subset as an input, taking the local recurrence label as an output label, and selecting an optimal model; and generating an output result by using the optimal model.

The invention provides a seismic data imaging method and system based on anisotropy, and belongs to the technical field of oil and gas field development. According to the method, on the basis of the research of anisotropy, a high-order difference operator equation is improved, and a vertical transverse medium anisotropy model and a transverse medium isotropy model are established on the basis of improved difference approximation expressions of different orders; the established vertical transverse medium anisotropy and transverse medium isotropy model is adopted to carry out seismic data imaging. According to the method, the physical property characteristics of the earth medium with dramatic changes in the longitudinal and transverse directions can be effectively processed; the method has the advantages of improving the signal-to-noise ratio of seismic data, improving the seismic imaging effect, improving the imaging precision of a fracture system and highlighting the seismic reflection characteristics of a target layer.

The invention relates to the technical field of semiconductors, in particular to an electro-optical modulation chip, an electro-optical modulator and a forming method of the electro-optical modulator. A Z-cut film lithium niobate chip plane isotropy and a vertical direction modulation electric field are utilized, the defect of crystal axis inversion before and after waveguide bending in the prior art is overcome, flexible and compact layout is realized, and meanwhile, the characteristic that a vertical electrode structure can be modulated when the waveguide is bent and the structure is changed is utilized, so that the device can be applied to the field of waveguide bending, and the device size is not increased. The length of a modulation area is increased, the modulation efficiency is improved, the defects of phase distortion, amplitude attenuation and the like in an existing modulator are overcome, and the modulator has higher speed and wider bandwidth.

Aspects of the present disclosure generally relate to wireless communications. In some aspects, a user equipment (UE) may transmit an uplink signal based, at least in part, on the uplink signal satisfying an enhanced effective isotropic radiation power (EIRP) threshold associated with a spherical coverage requirement, the enhanced EIRP threshold based, at least in part, on amplifying a base operating model associated with the absence of blocking with a signal blocking model. Numerous other aspects are described.

The invention belongs to the technical field of computer vision and three-dimensional point cloud processing. The invention provides an anisotropic point cloud convolution method based on local geometric self-adaption. According to the embodiment of the invention, the principal component analysis is carried out on the neighborhood point cloud to estimate the principal direction of the local geometric structure, and the affine transformation matrix is constructed; and performing dynamic deformation on the basic kernel point of the convolution operator by using the matrix, so that the shape and the direction of the convolution kernel are dynamically aligned with the local structure of the point cloud. The convolution operator is integrated into a point cloud registration network, and can be used for feature extraction of three-dimensional point clouds, especially underwater multi-beam depth finder point clouds. The convolution operator constructed by the method can effectively capture the structure priori of the strong anisotropic point cloud, and solves the problems of structure information loss and limited feature extraction capability caused by the isotropic kernel processing the data.

The invention discloses an automobile manufacturing part surface defect tracing and positioning detection system, and belongs to the technical field of industrial defect detection. Comprising an isotropic scattering reference point module, the surface of which is provided with a specific micron-sized three-dimensional geometric structure; the multi-view synchronous acquisition module is deployed in the circumferential direction of an automobile part detection station, comprises at least three industrial cameras which are arranged in an elevation angle difference manner, and acquires a multi-angle original image with a reference point through a synchronous triggering acquisition device; the scattering feature intelligent positioning module is in signal connection with the multi-view synchronous acquisition module; the dynamic calibration compensation module is used for receiving the initial registration result output by the multi-view geometric resolving unit and correcting a scattering compensation coefficient of the reference point in a high-curvature area in real time according to curved surface curvature distribution; and outputting the corrected high-precision three-dimensional reconstruction data. Through a refraction compensation formula, material optical parameters and geometric curvature are fused, and positioning error multiple compression is achieved in high-distortion areas such as vehicle door ridges.

The invention discloses an engineering calculation method and device for back irradiance of a high-precision double-sided photovoltaic module. The calculation method comprises the following steps: (1) inputting related parameter information of a photovoltaic power station; (2) the array is simplified into a two-dimensional diagram, and the sun position including the zenith angle and the azimuth angle is calculated; (3) calculating the ground shadow condition according to the geometric information of the component and the sun position; (4) calculating a sky view angle factor between rows which can be seen by each ground section according to the geometric parameters of the array; calculating an incident angle according to the dip angle, the component azimuth, the solar azimuth and the zenith angle; using a Perez model to decompose the input horizontal direct radiation irradiance and horizontal diffusion irradiance into a direct radiation part, an isotropic diffusion part, an annular solar region diffusion part, a horizon line scattering part and a ground reflection part; using a Perez model to calculate the diffused irradiance of the inclined plane; and (5) calculating the back irradiance after all the steps are completed. According to the method, a three-dimensional scene is simplified into a two-dimensional scene, a View Factor method, back shadow analysis and a sky view angle factor algorithm are simplified, the irradiance received by the ground is accurately considered, and the irradiance received by the back is calculated by using angle-by-angle incidence loss, so that the accuracy is not lacked, and the operation efficiency is high.

The invention relates to the technical field of unconventional shale oil and gas resource exploration, in particular to a shale shear wave velocity estimation method considering clay directional arrangement influence. According to the technical scheme, a shale compaction model is constructed, a shale directional arrangement background medium is formed, an orientation distribution function is used for simulating the elastic tensor of the background medium under different directional arrangement degrees, and the anisotropic speed of the background medium is calculated; calculating a longitudinal wave speed and a transverse wave speed in an equivalent isotropic background medium according to the anisotropic speed, and then calculating a bulk modulus and a shear modulus of the equivalent isotropic background medium; and adding clay-related pores and sand-related pores into an equivalent isotropic rock matrix by using an Xu-White model to obtain a bulk modulus and a shear modulus of dry shale, and finally simulating the shear wave velocity of the shale under the influence of directional arrangement of the clay. According to the invention, a new rock physical model is established to simulate the influence of clay directional arrangement, pore morphology, mineral and fluid properties on longitudinal and transverse wave velocities in shale.

The invention discloses a dielectric metasurface optical edge detection device and method based on dual-polarization-state Mie resonance, the method shows a non-local dielectric metasurface which is high in robustness and easy to prepare, and the device can achieve polarization-independent edge detection with excellent efficiency and high numerical aperture (NA). By simultaneously utilizing Mie resonance in the s polarization state and the p polarization state, isotropic two-dimensional second-order differential operation under any polarization condition (including non-polarization illumination) is realized. According to the design scheme, real-time image edge extraction can be achieved, the average peak efficiency reaches 30%, the working bandwidth of 40 nm is achieved at the center wavelength of 1064 nm, and high-quality edge detection can be kept under the numerical aperture of 0.5. The work provides a new method for realizing polarization-independent edge detection, and paves a way for practical application of an optical calculation and imaging system.

The invention provides a brain magnetic resonance image super-resolution reconstruction method and system based on a hidden representation model, and the method comprises the steps: obtaining anisotropic brain magnetic resonance images with different layer thicknesses, and dividing the anisotropic brain magnetic resonance images into training data and test data; preprocessing the brain magnetic resonance image; processing the preprocessed training data to generate a training sample; training the super-resolution reconstruction model based on the hidden representation model by adopting the training sample; and inputting the preprocessed test data into the trained model, stacking to obtain a three-dimensional image, and averaging to finally obtain an isotropic brain magnetic resonance image. According to the method, super-resolution reconstruction of anisotropic brain magnetic resonance images with different layer thicknesses is carried out by using a deep learning super-resolution reconstruction method, a learnable coordinate coding module based on a hidden representation model is designed, the correlation between image features and coordinate information is fully utilized, a mixed loss function is designed, and the super-resolution reconstruction of the anisotropic brain magnetic resonance images with different layer thicknesses is realized. And the accuracy of super-resolution reconstruction of anisotropic brain magnetic resonance images with different layer thicknesses is improved.

The invention provides a manufacturing method of a sigma trench and a semiconductor device thereof, and the manufacturing method of the sigma trench comprises the steps: providing a substrate, forming a gate structure on the substrate, and forming source and drain regions in the substrate at two sides of the gate structure; anisotropic dry etching is carried out, and a first groove is formed in the source drain region; performing an isotropic chemical reaction, raising the temperature after the reaction is finished to sublimate a reaction product, forming a second groove in the first groove, enabling the top of the side wall of the second groove to be located at the bottom of the gate structure, and forming an undercut at the bottom of the gate structure; and performing wet etching, and forming a sigma groove in the second groove. According to the Sigma trench formed by the three steps of anisotropic dry etching, isotropic chemical reaction and wet etching, the top of the side wall of the Sigma trench is located at the bottom of the gate structure, and the undercut is formed at the bottom of the gate structure, so that the linear distance between the source region and the drain region is shortened, the resistance is reduced, and the performance of the device is improved.

The invention discloses a near-surface anisotropic first-motion wave tomography inversion modeling method and related equipment, and provides a near-surface model which better conforms to actual geological conditions for pre-stack depth migration from theoretical assumption and actual inversion results which are closer to the actual geological conditions and the propagation law of seismic waves. At present, isotropic static correction and undulating surface pre-stack depth migration are promoted to anisotropic undulating surface pre-stack depth migration, the seismic data imaging quality of a double-complex exploration area is improved, the method is also a huge technical progress, the method is used for undulating surface pre-stack depth migration, a better imaging effect is achieved compared with the prior art, and the seismic data imaging quality of the double-complex exploration area is improved. According to the method, the characteristics that the signal-to-noise ratio of the first-motion waves is high and all the first-motion waves are propagated in the near-surface are utilized, the near-surface anisotropy is considered, and the accuracy and the imaging quality of the imaging position of depth migration are improved.

The invention relates to the technical field of optical devices, and particularly discloses a preparation method of an electrostatic drive MEMS Fabry-Perot filter, an SOI wafer is used as a first substrate, top silicon of the SOI wafer is used as a drive structure of the MEMS Fabry-Perot filter, the thickness and mechanical characteristics of a cantilever can be accurately adjusted, and the MEMS Fabry-Perot filter can be manufactured. And meanwhile, the silicon dioxide insulating layer of the SOI wafer can also be used as an etching stopping layer, so that the condition of excessive etching is avoided, and the manufacturing yield of the filter is further improved. When the bonding layer and the silicon dioxide insulating layer of the SOI wafer are etched, an etching method combining advanced oxide etching and reactive ion etching is adopted, isotropy and anisotropy are integrated, and the limitation of a single process is overcome. A certain dislocation amount of linear offset is reserved during patterning of bonding metal, gold-tin eutectic bonding is adopted, the problem of leading-out of top and bottom electrodes is solved, and the machining cost and uncertainty are reduced.

The invention relates to a real-time azimuth tracking model-based algorithm based on a horizontal circular array. The real-time azimuth tracking model-based algorithm comprises the following steps: S1, determining equipment parameters and water area environment parameters for measuring a moving target; s2, constructing an azimuth angle state space equation and a calculation formula of a sensor model; s3, measuring the background noise level of the water area, and giving a noise coefficient of a measurement equation; s4, setting an azimuth angle initial value by observing the approximate direction of the moving target by a measurer, or estimating the azimuth angle initial value through a conventional beam forming method; and S5, performing calculation through an unscented Kalman filter azimuth tracking algorithm framework, and solving the azimuth angle of the moving target in real time. According to the unscented Kalman filtering framework, the input is sound pressure real-time data, the output is a moving target azimuth angle, the online real-time performance of operation is ensured, meanwhile, a measurement equation based on a plane wave propagation model is constructed according to the spatial position of a horizontal circular array, and by means of the isotropic property of the circular array, the real-time performance of the horizontal circular array is improved. And the reliability of estimation results of the algorithm in all directions is ensured.

The invention discloses a polarized photoelectric detector, a preparation method thereof and an imaging device, and belongs to the technical field of polarized light detection. A photoelectric conversion layer on the substrate; the nanowire optical waveguide has a polarized light transmission characteristic and is positioned on the photoelectric conversion layer; the electrode is located on the photoelectric conversion layer, and the electrode and the nanowire optical waveguide are arranged at an interval. The electrodes are used for being connected with an external circuit, the nanowire optical waveguide serves as an optical waveguide to achieve selective transmission of polarized light, the photoelectric conversion layer serves as a photosensitive material to achieve photoelectric conversion, and photon-generated carriers generated through photoelectric conversion are transmitted to the two electrodes and guided into the external circuit to form light current. The polarized light response of the device provided by the invention comes from selective light transmission of the nanowire optical waveguide, and the polarized light response can be realized in an in-plane isotropic material. In addition, when the in-plane anisotropic material is used as the photosensitive material, the polarization ratio of the detector can be enhanced.

The invention provides a volume fraction comprehensive evaluation model for the Zener ratio of a mixed TPMS structure, and belongs to the technical field of dot matrix structure design. The method comprises the following steps: firstly, designing various TPMS basic structures by utilizing implicit function modeling; then, carrying out anisotropy research on the TPMS configuration by utilizing finite element simulation; secondly, based on a simulation result of axial elastic modulus complementation, software nTopology is utilized to carry out Boolean combination on an elastic modulus complementation structure; and then, finite element simulation is utilized to carry out anisotropy research on the Boolean bonding structure. And finally, proposing an isotropy and lightweight comprehensive evaluation model according to a Boolean bonding structure simulation result, and realizing the comprehensive evaluation of the isotropy and lightweight capability of the TPMS Boolean bonding structure. And a supplement is provided for research of Ti2AlNb in the field of lattice structures. A means for rapidly screening an excellent structure is provided for the mixed TPMS structure, and a theoretical foundation is laid for manufacturability and effectiveness of the mixed TPMS structure.

The disclosed and claimed subject matter relates to (1) a process for performing thermal atomic layer etching (ALE) of films that include ZrO2, HfO2, (Hf—Zr)O2 alloy or similar materials which does not require the use of plasmas or corrosive halogenating chemistries and (2) a metal-insulator-metal capacitor (MIMcap) with unique properties enabled by a unique dielectric processing method.

The invention discloses a broadband array gain forecasting method based on sound field spatial correlation correction. The method comprises the following steps: carrying out sound field modeling by utilizing marine environment data, calculating a channel frequency response function from a target to each array element position, estimating a correlation coefficient of an array element receiving signal after a useful signal is subjected to channel distortion, and forming a signal correlation coefficient matrix; an isotropic noise field model is used for estimating inter-channel noise correlation coefficients after the processing frequency band deviates from the ideal frequency, and a noise correlation coefficient matrix is formed; and finally calculating the array gain by using the two correlation coefficient matrixes. According to the method, the coupling condition of the underwater acoustic array and the actual marine environment in the working process can be effectively reflected, and the accuracy degree of the array gain calculation result can be improved.

The invention discloses a method and device for measuring the center frequency of an ultrasonic longitudinal wave probe, and belongs to the technical field of ultrasonic detection. The method comprises the specific steps that an isotropic metal test block containing a specific flat-bottomed hole and a transverse through hole is manufactured, and the flat-bottomed hole and the transverse through hole are both located in a probe far-field region; by measuring the echo height (Hf) and time (tf) of a flat-bottom hole and the echo height (Hs) of a transverse through hole and combining the positions and sizes of the flat-bottom hole and the transverse through hole, the center frequency (f) of the probe is calculated based on a formula. According to the method, the sound field characteristic difference of the double reflectors is creatively used for counteracting the machining precision interference, the operation process is simplified, and the problems that a traditional method is high in equipment cost, complex in operation and limited in applicability are solved. The test block also supports multi-material adaptation (steel, aluminum, titanium alloy and the like) and is suitable for industrial sites and laboratory environments, and the detection efficiency and economical efficiency are remarkably improved.

The invention provides a filter film, an optical waveguide and a display device, the filter film comprises at least one layer of first film and at least one layer of second film, the optical property of the first film is isotropic, the optical property of the second film is anisotropic, and the second film and the first film are sequentially and alternately stacked; wherein the second thin film is prepared from a target anisotropic material, and the optical axis inclination angle of the target anisotropic material is within a target inclination angle range, so that the transmittance of the filter film to the incident light is changed along with the change of the incident angle of the incident light; the optical axis inclination angle is an included angle between the optical axis of the target anisotropic material and the film surface. The light filtering film provided by the invention has relatively low transmittance for light incident at a large angle, so that the light incident at the large angle is difficult to penetrate through the light filtering film, and the light incident to the light filtering film at the large angle is difficult to form rainbow lines.

The invention provides a method for determining anisotropic strength of weakly cemented soft rock, and relates to the field of rock mass mechanics. The method specifically comprises the following steps: S1, preparing a weakly cemented soft rock hollow cylinder sample by adopting a coaxial double-core drill bit; s2, carrying out weak cemented soft rock directional shear tests in different large principal stress action directions by using a hollow cylinder torsional shear apparatus; s3, according to a directional shear test result, simplifying a damage point strength envelope line into an elliptical model; s4, establishing an anisotropic elliptical failure criterion implicit function mathematical model; and S5, determining parameters of the anisotropy model of the weakly cemented soft rock. Compared with the prior art, the method has the advantages that the defect that the isotropic strength criterion does not consider the main stress direction effect is overcome, and the reliability and accuracy of the anisotropic strength of the soft rock are improved.

The invention discloses a three-dimensional anisotropic grid generation method based on a streamline tracking topological structure, and relates to the field of numerical simulation of fluid mechanics, and the method comprises the steps: S1, carrying out the tetrahedral subdivision processing of a computational domain of an aircraft through employing a triangulation algorithm Delaunay, and achieving the isotropic grid subdivision of the computational domain; s2, using isotropic grid point information generated in the isotropic topological structure to construct a corresponding sign distance SDF resolving model so as to obtain a scalar field satisfying a Laplace equation; s3, calculating the gradient of the scalar field by adopting an SDF gradient solving method based on local least square fitting to obtain a corresponding gradient field; s4, performing streamline tracking in the gradient field to obtain a corresponding grid topological structure; and S5, constructing a structured hexahedral mesh covering the whole computational domain according to the mesh topological structure and the corresponding surface mesh. According to the method, theoretical unification and engineering feasibility of two-dimensional to three-dimensional grid structure mapping are realized.

The invention provides a coal mine goaf ponding change relation model construction method, which utilizes a numerical method to establish a three-dimensional hydrogeological model of a heterogeneous anisotropic aquifer, and solves the problem that a traditional analytical method can only be used for solving a homogeneous isotropic aquifer with a regular geometrical shape. The change process of the dynamic supply goaf of the aquifer is successfully simulated, the established model is identified and verified to be more suitable for the real hydrogeological environment of a research area, technical support is provided for successfully solving goaf water disasters for a coal mine, safe stoping of a working face is achieved, and the working efficiency is improved. And a method reference is provided for coal mine water prevention and control engineering in mining areas with similar hydrogeological conditions in China.

A method for assisting in the performance of a surgical procedure on a patient is disclosed. The method includes receiving an intra-operative CT scan image, generating a three-dimensional isotropic scaffold based on the intra-operative CT scan image, fusing one or more images with the three-dimensional isotropic scaffold to form a three-dimensional model of a portion of the body of the patient, receiving information regarding the surgical procedure, determining obstacles in the path of the surgical procedure, and determining possible trajectories for the surgical procedure. The received information includes information regarding a surgical target to be operated upon, a region of access on the skin of the patient, and a surgical instrument to be used during the surgical procedure.

The invention belongs to the technical field of metal material production, and relates to a 500MPa-grade ship plate with excellent isotropic performance and a manufacturing method, and the ship plate comprises the following components in percentage by weight: 0.030%-0.080% of C, 0.050%-0.200% of Si, 0.70%-1.20% of Mn, less than or equal to 0.005% of P, less than or equal to 0.003% of S, 0.040%-0.090% of Nb, 0.080%-0.180% of V, 0.0250%-0.0300% of N, 0.20%-0.50% of Cu, 0.30%-1.00% of Ni, 0.006%-0.025% of Ti, 0.015%-0.040% of Als, 0.0100%-0.0800% of La, and the balance of Fe and inevitable impurities. The method has the advantage that the performance isotropy of the steel plate is improved.