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5 results about "Accuracy and precision" patented technology

In measurement of a set, accuracy refers to closeness of the measurements to a specific value, while precision refers to the closeness of the measurements to each other.

Microblog emotion analysis method based on standard dictionaries and semantic rules

The invention discloses a microblog emotion analysis method based on standard dictionaries and semantic rules. The microblog emotion analysis method comprises the following steps: collecting microblog data and manually labeling and marking the emotion value of each microblog; proposing corresponding standard micrblog emotion dictionaries, and establishing an emotion dictionary database; based on the standard emotion dictionaries, adding the semantic rules for assistance, and performing parameter adjustment and optimization on parameters of the semantic rules; based on a real dataset experiment, acquiring the final classification accuracy and precision. The technical scheme provided by the invention is adopted to well analyze the emotion tendency of each microblog user by introducing the standard emotion dictionaries, microblog expression dictionaries and the semantic rules, therefore, higher classification accuracy and precision are achieved.
Owner:BEIJING UNIV OF TECH

Long-gap discharge leader development speed measurement method based on radiated electromagnetic wave detection

The invention relates to a long-gap discharge leader development speed measurement method based on radiated electromagnetic wave detection. The method comprises a set of high-frequency antennas and a high-speed oscilloscope and a long-gap discharge leader development speed calculating method. The method adopts a certain antenna arrangement form; long-gap discharge radiated electromagnetic wave pulse time is detected simultaneously through the plurality of antennas; leader head position is positioned according to time difference of a signal arriving at different antennas; and furthermore, the long-gap discharge leader development speed can be calculated. The method can effectively improve the measurement precision of the discharge leader development speed, and resolution reaches the level of 0.1 ns.
Owner:WUHAN UNIV

A Modeling Method for Shear Force in Crescent-Shaped Edge Cutting Shear

This invention provides a modeling method for the shear force of a crescent-shaped shear blade, comprising the following steps: 1) expanding and parameterizing the theoretical shear blade arc into a function based on its formation process; 2) calculating the slope of each point on the arc; 3) determining the shear angle at each point on the arc based on the slope in step 2); 4) calculating the Nosari shear force using the shear blade shear's Nosari formula; 5) calculating the shear force at each point on the arc based on step 4); and 6) identifying the point with the maximum shear force within the range of the arc's values ​​as the design basis for the crescent-shaped shear blade. The data used in this modeling process are readily available, thus avoiding the impact of measurement errors on the shear force data, resulting in high calculation accuracy and precision. This invention solves the modeling problem for calculating the shear force of a crescent-shaped shear blade, transforming a complex model into a simple one, saving time, and offering low cost and high flexibility.
Owner:CHINA NAT HEAVY MACHINERY RES INSTCO