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237 results about "Method evaluation" patented technology

Method evaluation. An early phase of testing in which a series of experiments are performed to estimate the magnitude of analytical error.

System, method and computer program product for handling small aggressors in signal integrity analysis

A method, system and computer program product for determining aggressor-induced crosstalk in a victim net of a stage of an integrated circuit design is provided. The methodology can include combining a plurality of aggressor nets to construct a virtual aggressor net, determining a current waveform induced on the victim net by the plurality of small aggressor nets, and modeling a current waveform induced by the virtual aggressor on the victim net based on the contribution of the current waveforms determined for the plurality of small aggressor nets. In a further embodiment, the methodology can also comprise evaluating an effect of an aggressor net on a victim net; and including that aggressor net in the virtual aggressor net if its effect is below a predetermined threshold. The effect evaluated by the methodology can, for example, be the height of a glitch induced on the victim net by a transition in the aggressor net. Additionally, the aggressor net can be included in the virtual aggressor net if the height of the glitch it induces on the victim net is less than a predetermined factor of the supply voltage. Switching probability can be used to compute a 3-sigma capacitance value, and this value can be used to limit the number of small aggressors included in the virtual aggressor net. The combined currents of the aggressor in the virtual aggressor net can be modeled using a piece-wise linear analysis.
Owner:CADENCE DESIGN SYST INC

Method for evaluating surface detects of small-sized workpieces and flow for detecting unqualified workpieces

The invention discloses a method for evaluating surface detects of small-sized workpieces. The method comprises the following steps of: acquiring surface images of small-sized workpieces under a specific light source with an industrial camera; detecting various defects such as unfilled corners, edge dropping, abnormity, pockmarks, cracks and the like of the small-sized workpieces based on image processing and profile analyzing methods; evaluating the severity and quantity of defects such as the unfilled corners, the edge dropping and the like of the small-sized workpieces by adopting a convexdefect evaluating parameter and a method for combining the convex defect evaluating parameter with a linearity evaluating parameter; and evaluating the degrees of the pockmark and crack defects with a threshold value segmentation method based on dimensional histogram statistic and the ratio of pockmark pixels. Based on the evaluation, the invention further provides a flow for detecting surface-unqualified workpieces. The flow has low false detecting rate, high detecting speed and wide application range, can meet the online detection requirement of the small-sized workpieces, and is suitable for detecting surface defects of various small-sized workpieces.
Owner:NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI

Grid investment benefit evaluation method based on multiple indexes and multiple levels

The invention discloses a grid investment benefit evaluation method based on multiple indexes and multiple levels. The grid investment benefit evaluation method is technically characterized by comprising the following steps of: constructing a grid investment benefit evaluation system comprising a main grid frame, a distribution network sub unit, a dividing specialty and a component voltage level investment benefit index; carrying out simplified processing on the index in the grid investment benefit evaluation system; carrying out unitization processing on the index in the grid investment benefit evaluation system; carrying out index weight calculation on the index in the grid investment benefit evaluation system; and evaluating the investment benefit of each examination object by using a linear comprehensive marking method. According to the method, the grid investment benefit evaluation system is constructed from four levels such as the main grid frame, the distribution network sub unit, the dividing specialty and the component voltage level investment benefit index; the accuracy of the investment evaluation is improved; the comparing and the finding of the problems existing in the grid investment are facilitated; and the grid investment benefit evaluation method can not only be used for post evaluation of the grid investment benefit or used for providing an important decision reference for the grid construction investment direction for the coming year.
Owner:STATE GRID TIANJIN ELECTRIC POWER +1

Cluster communication terminal track real time anomaly detection method and system based on hybrid grid hierarchical clustering

The invention relates to the communication field, and provides a cluster communication terminal track real time anomaly detection method and system based on hybrid grid hierarchical clustering. The method comprises the steps: the step 1: constructing a track based on grids, and determining the size of the optimal grid; the step 2: calculating a Hausdroff distance matrix, utilizing a Hausdroff distance formula to calculate the distance between all the tracks based on the tracks of the grids, and generating a distance matrix of a track set; the step 3: hierarchical clustering, that is, based on the Hausdroff distance matrix of the track set, applying an agglomerate hierarchical clustering algorithm from bottom to top to realize classification of normal and abnormal tracks of a large scale of tracks; and the step 4: anomaly detection method evaluation and feedback: utilizing the above method to perform anomaly track detection on the track set which has a track classification identifier to obtain an anomaly classification result, and evaluating whether a model parameter is reasonable after comparison and making a feedback. The cluster communication terminal track real time anomaly detection method based on hybrid grid hierarchical clustering can realize on-line real time detection of an anomalous event, and can improve the upper layer dispatching efficiency of a cluster communication system.
Owner:NANJING UNIV

Distributed photovoltaic power connection planning method giving consideration to electric energy quality problem

The invention relates to a distributed photovoltaic power connection planning method giving consideration to an electric energy quality problem. The method specifically comprises the steps: taking the current total harmonic distortion rate, voltage deviation and voltage fluctuation of an access point as the characteristic quantities for representing the electric energy quality of a power grid after a photovoltaic power optimization configuration connection scheme based on the maximum connection capacity is determined, estimating the electric energy quality of the access point through a data envelopment analysis method, and giving a correction scheme for the access point which does not accord with an electric energy quality standard; finally obtaining a distributed photovoltaic power generation planning scheme which accords with the standard in electric energy quality. Compared with a conventional method of treatment after connection, the method is higher in economic performance, employs a more advanced algorithm for processing the problem, and is enabled to be more scientific. The method gives consideration to the electric energy quality problem after photovoltaic connection at a planning stage, can guarantee the normal stable operation of a connection project and the equipment of the power grid, also can give margin for the connection of a long-term photovoltaic power supply, and is good in prospect.
Owner:YICHANG POWER SUPPLY CO OF STATE GRID HUBEI ELECTRIC POWER CO LTD
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