Abstract: Disclosed are a tailor welded blank and a manufacturing method thereof. The tailor welded blank is manufactured by connecting blank elements of different materials or thicknesses, thereby eliminating quality problems in a welded zone. A hot stamped component is manufactured by hot stamping the tailor welded blank formed by laser-welding blank elements made of coated steel plates having different strengths or thicknesses using a filler wire, wherein a laser-welded zone has a martensite structure.

Abstract: An apparatus for generating a hologram in accordance with an embodiment of the present invention includes: a frequency component data generating part configured for generating frequency component data comprising a spatial frequency component of a spherical wave generated at a sampling point of a graphic model; an input part configured for receiving a generation angle and a generation position corresponding to a plane hologram; a frequency component search part configured for extracting a hologram target component for a main spatial frequency vector having a most similar direction with the generation angle from the frequency component data; an angular spectrum generating part configured for generating an angular spectrum by multiplying a predetermined factor to the hologram target component and propagating the angular spectrum according to the generation position; and a hologram generating part configured for generating the plane hologram by applying inverse Fourier transform to the angular spectrum.

Abstract: A system and method for generating an occlusion-culled hologram at a high speed using an omnidirectional angular spectrum in which it is possible to uniformly maintain a hologram generation speed regardless of the sampling number of an object and increase the three-dimensional (3D) effect of a hologram image. The system includes a omnidirectional angular spectrum generation module configured to receive geometric information of an object and generate an occlusion-culled omnidirectional angular spectrum based on the received geometric information, and a hologram generation module configured to generate a hologram based on the omnidirectional angular spectrum provided from the omnidirectional angular spectrum generation module and the positional information and the directional information of a hologram provided from the outside.

Abstract: Disclosed are a tailor welded blank and a manufacturing method thereof. The tailor welded blank is manufactured by connecting blank elements of different materials or thicknesses, thereby eliminating quality problems in a welded zone. A hot stamped component is manufactured by hot stamping the tailor welded blank formed by laser-welding blank elements made of coated steel plates having different strengths or thicknesses using a filler wire, wherein a laser-welded zone has a martensite structure.

Abstract: Provided are a hologram object position estimating apparatus and method for estimating a position of an object recorded in a hologram at a high speed using only light wave information recorded in the hologram. The apparatus for estimating a position of a hologram object includes a local spatial frequency calculating unit configured to calculate a local spatial frequency on a plane based on input hologram data, and a light ray focal point calculating unit configured to calculate a focal point on which light rays starting from the hologram plane converge on a hologram plane using the local spatial frequency calculated by the local spatial frequency calculating unit to estimate a position of an object.

Abstract: Provided is a spherical hologram generation method and apparatus, the apparatus including a shaper to generate a virtual spherical surface with respect to an object, and dispose a plurality of unit plane holograms on the spherical surface, and a processor to record a light wave related to the object in each of the plurality of unit plane holograms, and restore an omnidirectional stereoscopic image of the object using the recorded light wave.

Abstract: Disclosed are a tailor welded blank and a manufacturing method thereof. The tailor welded blank is manufactured by connecting blank elements of different materials or thicknesses, thereby eliminating quality problems in a welded zone. A hot stamped component is manufactured by hot stamping the tailor welded blank formed by laser-welding blank elements made of coated steel plates having different strengths or thicknesses using a filler wire, wherein a laser-welded zone has a martensite structure.

Abstract: A holographic content providing method, and a holographic content providing apparatus and a display apparatus using the method may capture and generate holographic content using a real object, a virtual object and lighting information, and may conduct integrated processing on the generated holographic content, such as direct edition, advance visualization, data format conversion, element technologies for optical reconstruction and manufacture process management techniques of holographic content, thereby producing ultrahigh-quality interactive holographic content.

Abstract: Disclosed is a method for processing interaction between a user and hologram using a volumetric data type object wave field. A method for processing interaction between a user and hologram for user's action using a volumetric data type object wave field includes: capturing user action on the holographic image of the object and solving collision between user and object; computing the updated position and rotation of the object by time integration of rigid body equation in collision; calculating the relative position and rotation of the hologram plane with respect to local object coordinates; transforming the hologram in the pre-computed volumetric object wave field grid according to the relative position and rotation of the hologram plane in local object coordinates and reading the object wave fields at all the pixels of the transformed hologram plane in order to generate a new hologram for the transformed object caused by user action.

Abstract: A system and a method perform buoyance of a 3D hologram image on a hologram display screen in a projection mode. A system of displaying a digital hologram includes: a composite hologram unit configured to generate a hologram array by receiving hologram data of a fringe pattern and by compositing background image and a foreground image using the received fringe pattern; a hologram projection unit configured to project a hologram image through a wide-angle lens by applying a light to the hologram array; and a hologram display unit configured to perform space buoyance of the hologram image projected by the hologram projection unit on a 3D hologram display screen. The digital hologram content is managed in real time, and transmission of the digital hologram content to a remote place and site adaptive display of hologram image media may be achieved.

Abstract: Provided are a digital hologram synthesis method and apparatus based on an angular spectrum. The digital hologram synthesis method includes representing an input digital hologram as at least one angular spectrum region by applying Fourier transformation to the input digital hologram, registering the at least one angular spectrum region by projecting the at least one angular spectrum region onto a spherical surface, and generating a synthesis digital hologram based on the registered at least one angular spectrum region. Accordingly, it is possible to generate a new digital hologram with a different orientation or at a different distance using an angular spectrum of a digital hologram generated in advance, without geometric information of an object. In addition, it is possible to readily and intuitively synthesize a new digital hologram while viewing an image visualized in a 3D space.

Abstract: Disclosed are a tailor welded blank and a manufacturing method thereof. The tailor welded blank is manufactured by connecting blank elements of different materials or thicknesses, thereby eliminating quality problems in a welded zone. A hot stamped component is manufactured by hot stamping the tailor welded blank formed by laser-welding blank elements made of coated steel plates having different strengths or thicknesses using a filler wire, wherein a laser-welded zone has a martensite structure.

Abstract: A hologram data processing method using a hologram fringe data format adaptive to a data encoding scheme includes configuring model data of a three-dimensional (3D) object corresponding to source data to be used for generating a hologram, computing hologram fringe data by applying a diffraction transform to a light wave transferred to a hologram plane based on the model data of the 3D object, setting, in the computed hologram fringe data, the hologram fringe data format adaptive to a data encoding scheme for reconstructing the hologram, reconstructing an optical hologram by applying the data encoding scheme to the hologram fringe data, and adjusting the optical hologram by comparing a reconstructed image of the optical hologram to a reconstructed image of a numerical hologram.

Abstract: This invention relates to a coating layer structure of a basic material of a mold, which exhibits good adhesion between a coating material and a basic material and does not cause cracking when coated. Such a coating layer structure includes an ion nitriding layer formed at the surface of the basic material, a middle coating layer formed on the ion nitriding layer using AlTiCrN, AlCrSiN, AlTiSiN, or AlTiCrSiN, and a surface coating layer formed on the middle coating layer using AlTiCrCN, AlCrSiCN, AlTiSiCN, or AlTiCrSiCN.

Abstract: A three-dimensional (3D) remeshing apparatus includes a curved surface geometry module for calculating one or more geometric elements, including a normal and a curvature, based on data of an input mesh, a vertex grouping module for grouping vertices of the mesh into a general group, an edge group, and an apex group using information of the curvature calculated by the curved surface geometry module, and a projection module for searching for one or more tangent planes corresponding to one or more of the vertices grouped by the vertex grouping module, projecting one or more corresponding vertices on each of the tangent planes, and restoring one or more edges of the input mesh.

Abstract: A method for incompressible fluid simulations includes: calculating a force acting on each particle forming a fluid; calculating a velocity field satisfying a incompressibility condition of the fluid based on the calculated force; and moving the particle in the velocity field. Further, the calculating a velocity field includes: calculating a temporary velocity of the particle free of compression based on the calculated force; calculating pressure satisfying the incompressibility condition of the particle based on the calculated temporary velocity; and calculating velocity satisfying the incompressibility condition of the particle by applying the calculated pressure.

Abstract: A method of processing a rigid body interaction in a particle-based fluid simulation includes determining a collision direction based on a normal vector of a pair of input particles and confirming whether parent objects of the particles actually collide against each other after the determination, and calculating a perpendicular impulse based on properties of the parent objects when the collision is confirmed. The method further includes calculating a final collision based boundary force by applying a tangential friction force to the calculated perpendicular impulse to apply the final collision based boundary force to the respective particles.

Abstract: Provided is an image-based volume data carving method for rapidly carving a specific area of dimensional volume data based on images. The method includes the steps of: generating a mask image to be carved from an input image; dividing a viewing transform matrix of the mask image into a shear transform matrix and a warp transform matrix, and calculating a scale factor from the shear transform matrix; modifying the mask image to be parallel to an axis of the volume data; shearing a volume slice in such a manner that the volume data can be parallel to viewing rays passing through a volume, and scaling the size of the volume slice; and carving part of the volume slice through an operation between the mask image and each volume slice.

Abstract: Provided are a system for generating a surface mesh surrounding particles on a 3D space. An implicit function module receives particle data containing three-dimensional location and radius data of the particles, grids the particles into rectangular parallelepiped shape, and generates implicit function data having implicit function value determining the surface at grid points. A mesh module generates a mesh through a pre-process of substituting the implicit function value of the gird point, where the implicit function value is defined, by zero when the a distance between a grid point where the implicit function value of the implicit function data and the vertex of the mesh is within a set distance. Accordingly, the system and method are useful for visualizing the results of particle simulations used in basic science and engineering. In particular, the system and method can generate high-quality mesh in computer graphics of fluid simulation using the particles.

Abstract: A three-dimensional (3D) remeshing apparatus includes a curved surface geometry module for calculating one or more geometric elements, including a normal and a curvature, based on data of an input mesh, a vertex grouping module for grouping vertices of the mesh into a general group, an edge group, and an apex group using information of the curvature calculated by the curved surface geometry module, and a projection module for searching for one or more tangent planes corresponding to one or more of the vertices grouped by the vertex grouping module, projecting one or more corresponding vertices on each of the tangent planes, and restoring one or more edges of the input mesh.