Abstract: An apparatus includes a memory; and a processor coupled to the memory and configured to: specify a shape type of an opening including a series of planes detected from planes of a plurality of second virtual rectangular parallelepipeds obtained by dividing a first virtual rectangular parallelepiped internally containing a virtual object in a simulated space based on a first shape of a first line obtained by projecting the series of planes from a direction based on a specific plane of the first virtual rectangular parallelepiped onto a projection plane which is perpendicular to the direction and located at a position more distant from the specific plane than the series of planes, calculate a resonance frequency of a wave leaking through the opening, based on the specified shape type of the opening; and present the calculated resonance frequency on a display.

Abstract: A coupling distance y of a plurality of securing elements for coupling two members to construct a casing for accommodating a circuit board having electric components mounted thereon inside space surrounded by a conductor extracted from design data, an overlapping width x of overlap sections provided to the two members for coupling the two members with the plurality of securing elements, the overlap sections contacting to each other, and a wavelength ? of electromagnetic noises generated from the electric components, are extracted. Then, a recommended coupling distance Y for the plurality of securing elements to attenuate the electromagnetic noises by a certain attenuation amount is calculated, based on the overlapping width x and the wavelength ?, and the coupling distance y is compared with the recommended coupling distance Y. Thereby, verifications of an electromagnetic noise countermeasure can be made reliably without relying on settings by a user.

Abstract: A housing includes a first member that has a first conductor, a second member that has a second conductor and cooperates with the first member to accommodate a circuit board on which an electronic element is mounted, inside a space surrounded by the first conductor and the second conductor, and a plurality of connecting elements that are arranged at a predetermined arrangement interval y to fix the second member to the first member.

Abstract: A coupling distance y of a plurality of securing elements for coupling two members to construct a casing for accommodating a circuit board having electric components mounted thereon inside space surrounded by a conductor extracted from design data, an overlapping width x of overlap sections provided to the two members for coupling the two members with the plurality of securing elements, the overlap sections contacting to each other, and a wavelength ? of electromagnetic noises generated from the electric components, are extracted. Then, a recommended coupling distance Y for the plurality of securing elements to attenuate the electromagnetic noises by a certain attenuation amount is calculated, based on the overlapping width x and the wavelength ?, and the coupling distance y is compared with the recommended coupling distance Y. Thereby, verifications of an electromagnetic noise countermeasure can be made reliably without relying on settings by a user.

Abstract: A housing includes a first member that has a first conductor, a second member that has a second conductor and cooperates with the first member to accommodate a circuit board on which an electronic element is mounted, inside a space surrounded by the first conductor and the second conductor, and a plurality of connecting elements that are arranged at a predetermined arrangement interval y to fix the second member to the first member.

Abstract: An antenna design method executed by a computer includes creating an antenna model including an antenna which includes a plurality of antenna elements and matching circuits which are respectively connected to the plurality of antenna elements and which comprise a matching element including a parasitic reactance and a loss resistance; obtaining a characteristic of the antenna and a characteristic of the matching element; calculating a characteristic of the created antenna model using the obtained characteristic of the antenna and the characteristic of the matching element; judging whether or not the calculated characteristic of the antenna model satisfies a standard value; and displaying result of the judgment.

Abstract: An apparatus includes a memory; and a processor coupled to the memory and configured to: specify a shape type of an opening including a series of planes detected from planes of a plurality of second virtual rectangular parallelepipeds obtained by dividing a first virtual rectangular parallelepiped internally containing a virtual object in a simulated space based on a first shape of a first line obtained by projecting the series of planes from a direction based on a specific plane of the first virtual rectangular parallelepiped onto a projection plane which is perpendicular to the direction and located at a position more distant from the specific plane than the series of planes, calculate a resonance frequency of a wave leaking through the opening, based on the specified shape type of the opening; and present the calculated resonance frequency on a display.

Abstract: A computing method includes: detecting, in a circuit board, a coordinate of an area where a current greater than or equal to a threshold flows; extracting signal layer currents and GND layer currents within a given range based on the coordinate, the signal layer currents flowing in a signal layer and the GND layer currents flowing in a GND layer; computing, by a computer, a first current as a sum of the signal layer currents and a second current as a sum of the GND layer currents; and computing a third current as a sum of the first current and the second current in a section direction of the circuit board.

Abstract: An antenna design method executed by a computer includes creating an antenna model including an antenna which includes a plurality of antenna elements and matching circuits which are respectively connected to the plurality of antenna elements and which comprise a matching element including a parasitic reactance and a loss resistance; obtaining a characteristic of the antenna and a characteristic of the matching element; calculating a characteristic of the created antenna model using the obtained characteristic of the antenna and the characteristic of the matching element; judging whether or not the calculated characteristic of the antenna model satisfies a standard value; and displaying result of the judgment.

Abstract: A three-dimensional data display apparatus is provided with a screen display processing section that generates a display screen with a structure arranged in a virtual space of a three-dimensional orthogonal coordinate system based on structure information stored in a data storage section and displays the display screen on a monitor, a grid setting-updating section that sets a grid in the virtual space, an operation information acquiring section that acquires operation information from a mouse, an input point position calculation section that calculates coordinates of an input point in the virtual space, calculates a moving destination of the input point based on the operation information, selects coordinates nearest to the moving destination of the input point from any one of the coordinates of each grid lattice based on the grid in the virtual space, the coordinates of a boundary of the structure and the coordinates of the point of intersection between the boundary of the structure and the grid and updates t