42 results about "Symmetric property" patented technology

Computer time for modeling VLSI interconnection circuits is reduced by using symmetric properties of modified nodal analysis formulation. The modeling uses modified nodal analysis matrices then applies a Krylov subspace matrix to construct a congruence transformation matrix to generate the reduced order model of the VLSI.

The invention discloses a method for judging the movability of a symmetric rod system structure based on a group theory, belonging to the field of building structure designs and space structural designs. The method is particularly suitable for the initial design of a deployable structure. According to the method, a degree of freedom formula of the symmetric rod system structure is simplified to various types of symmetric linear expressions based on inherent irreduable representations and characteristic standard values of a symmetric group; and the symmetric property of a mechanism displacement mode and a self-stress mode is obtained, so that the movability of the symmetric structure can be directly judged. Compared with the conventional movability judgment method in which the symmetric property of the structure is not used fully and the analysis calculation for large structures is complicated, the method has the advantages that: the movability of most symmetric rod systems can be judged by only carrying out simple vector calculation and simplification, and a structure designer can popularize and apply the method conveniently.

The invention belongs to the technical field of computer vision, and discloses a symmetry property-based method for detecting salient regions of images, aiming at solving the problem of salient regions during the existing Itti model detection. The method comprises the following steps of processing target images to obtain images with different dimensions, respectively extracting frequency domain symmetric properties and time domain symmetric properties of the images with the different dimensions, and merging the images to obtain a time frequency characteristic image so as to obtain a final saliency map. The method combines the time domain symmetric properties with the frequency domain properties to accomplish the detection of the salient regions of the images. The detection method can more completely detect salient targets by utilizing the function of the symmetry properties, which is played in the process of eye fixation, so that the detected salient regions of the images are more in line with the result of the eye fixation.

A semiconductor device including an AND-NOR composite gate of which AND unit is supplied with input signals IN and VDD and NOR unit is supplied with an inverted signal EB of an enable signal E, and an AND-NOR composite gate of which AND unit is supplied with an input signal INB and an enable signal E and NOR unit is supplied with VSS. These gates are inserted into a path to which the input signals IN and INB are supplied. Thereby, a symmetric property of a complimentary signal can be retained. Further, outputs of the AND-NOR composite gates are fixed irrespective of a logical level of the enable signal E. Thus, a sub-threshold current also is inhibited.

Disclosed is an electromagnetic-force-balancing-type electronic balance having a magnetic circuit which includes a yoke 4, a first permanent magnet 1, a pole piece 3, a second permanent magnet 2 and a cover 5. A connection member 7 made of a magnetic material is disposed in an air-gap region included in the magnetic circuit. The connection member 7 may be disposed between the second permanent magnet 2 and the cover 5 or between the cover 5 and the yoke 4 to facilitate assembling operations. Alternatively, first and second gap-defining members 8, 9 made of a non-magnetic material may be disposed, respectively, between the first permanent magnet 1 and the yoke 4 and between the second permanent magnet 2 and the cover 5, to provide symmetric properties in magnetic sub-circuits so as to counteract an imbalance in hysteresis characteristic. The present invention can suppress adverse influences of a magnetic resistance caused by an air gap existing in the magnetic circuit of the electronic balance.

The invention discloses a constant width beam forming method based on an FIR filter, wherein a received signal f (t, x) =[f(t, x0), ..., f(t, xm), ..., f(t, xM-1)] T of a microphone array is processedthrough a beam forming method to obtain an output signal which is shown in the description, wherein f (t, x) represents a sampled signal of the microphone array at a t time position of x, () T represents a matrix transpose, m represents a microphone index, wherein m=0,1,... M-1, M represents the number of microphone array elements, xm represents the array element positions corresponding to the mth microphone, and x=[x0, ... ,xm,... ,xM-1); N represents the order of the FIR filter followed by each microphone, the description represents the coefficient of the n-order FIR filter followed by themth microphone, the superscript * represents the conjugate, and Ts represents the delay between adjacent filters. The method can enable the array to have the same spatial response to input signals with different frequencies within the main lobe width, and the beam forming device with approximately constant beam width and low side lobe array response is designed by utilizing the symmetric properties of the FIR filter array and microphone uniform linear array.

The present invention may significantly reduce the number of iteration of the time recursive IFFT structure. First, the real and imaginary part of the input signal are modified based on the symmetric and anti-symmetric. Then, they are mixed together by an adder and fed into the lattice module. Next, an IFFT is performed on the modified input data sequence to generate a transformed sequence. Through the symmetric and anti-symmetric properties, the redundant terms may be eliminated.

An OFDM transmitter capable of improving a transmission rate of OFDM signals and a method for compressing signals thereof are provided to increase a transmission rate of whole data by reducing the length of one OFDM symbol. An inverse fourier transform unit(200) transforms OFDM(Orthogonal Frequency Division Multiplexing) signals of a frequency domain into OFDM signals of a time domain through inverse fourier transform. An even function extracting unit(210) extracts an even function signal symmetrical to a y axis from the OFDM signals of the time domain. An odd function extracting unit(230) extracts an odd function signal symmetrical to the origin from the OFDM signals of the time domain. The even function signal is formed of the sum of a first even function signal and a second even function signal. A first selecting unit(213) selects anyone of the first even function signal and the second even function signal. The odd function signal is formed of the sum of a first odd function signal and a second odd function signal. A second selecting unit(233) selects anyone of the first odd function signal and the second odd function signal. A first cutting unit(215) takes one half signal of the selected even function signal. A second cutting unit(235) takes one half signal of the selected odd function signal.

The symmetry properties of a magnetic levitation arrangement are exploited to produce spin-stabilized magnetic levitation without aligning the rotational axis of the rotor with the direction of the force of gravity. The rotation of the rotor stabilizes perturbations directed parallel to the rotational axis.

An object of the present invention is to provide a boundary element analytic method and a boundary element analytic program, which are capable of coping with the problem of diversity in symmetric property to be encountered when carrying out an analytic operation by taking advantage of the symmetric property of a subject to be analyzed, and thus providing an efficient analysis.

Various types of data for the use in the boundary element analysis, which have been previously input at step S101, are stored at step S102. To carry out this operation, at least boundary element definition information for defining a boundary element in the subject to be analyzed and state quantity information in which boundary element identification information for identifying the defined boundary element is associated with the boundary element for each state quantity thereof. At step 103, the input different types of data are used to generate a digitized boundary integral equation with a boundary value at a point of element on each defined boundary element taken as a variable. Then, at step S104, the generated boundary integral equation is assigned with the input boundary condition to sort out any unknowns, thus obtaining the simultaneous equations. The obtained simultaneous equations are then solved to determine respective values for the unknowns.

Disclosed is a method for measuring the similarity of two-dimensional images, at least one image exhibiting an additional signal, the location dependence or symmetry properties of which are known at least approximately. The images are partitioned into mutually identical subimages such that the extension of at least one subimage in the direction of the gradient of the additional signal is smaller than the extension of this subimage in the direction perpendicular thereto. The subimages are compared separately, and the results of all comparisons are combined to form the measurement result for similarity. As a result, the method becomes insensitive to variations in the additional signal. The method is particularly suited for the determination of defocusing and astigmatism of an electron-microscopic image. For this purpose, it is important to compare the similarity of an experimentally measured image to simulated images, which were generated using defined defocusing and astigmatism values.