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595 results about "Aggregation methods" patented technology

Aggregation methods and the data types that can use them. Aggregation methods are types of calculations used to group attribute values into a metric for each dimension value. For example, for each country (each value of the Country dimension), you might want to retrieve the total value of transactions (the sum of the Sales Amount attribute).

Content aggregation method based on distributed web crawlers

The invention provides a content aggregation method based on distributed web crawlers, which comprises the steps that firstly different crawler platforms are arranged at different devices, a request is sent to a crawling network information source end, and the crawler platforms fabricate crawling rules according to target information required by a user and crawl information in which the target user is interested; the crawled network information is processed, similarity detection is carried out based on a data transmission and conversion method in a real-time database and by being combined with a locality sensitive hashing (LSH) method so as to reduce the redundancy of the information; and the information is classified and sorted by the system according to the category, the heat and keywords and then displayed on user equipment. According to the method provided by the invention, LSH and similarity comparison are carried out according to the data information acquired in an actual network so as to acquire a comparison result. Compared with a comparison result acquired by adopting a traditional mode of whole data duplication checking in the prior art, the content aggregation method is higher in calculation speed and more accurate in similarity comparison.
Owner:江苏未来网络集团有限公司

Vehicle trajectory generation method and apparatuses, and vehicle trajectory aggregation method and apparatuses

ActiveCN105225476AEfficient extraction of backbone trajectoriesExtract backbone trackDetection of traffic movementSpecial data processing applicationsTime segmentStop time
The invention provides a vehicle trajectory generation method, including steps of 1, querying through-pass records of vehicles in a database in a period from beginning time to ending time, and ordering records according to the chronological order; 2, calculating a time difference between a current vehicle-through record and a next vehicle-through record, and querying an average vehicle-through time between two passes of the current vehicle-through record and the next vehicle-through record; 3, determining whether a vehicle stops moving between the two passes according to the time difference, the average vehicle-through time and a preset vehicle stopping time, if so, carrying out a step 4, and if not, carrying out a step 5; 4, taking a pass corresponding to the current vehicle-pass record as a tail pass of a vehicle trajectory, so that the trajectory generation is finished; and 5, taking the pass corresponding to the current vehicle-pass record as a non-tail pass of the vehicle trajectory, and taking the next vehicle-through record as a current vehicle-through record, and re-executing the step 2. The invention also provides a vehicle trajectory aggregation method. The invention can generate vehicle driving trajectory rules based on vehicle-through records in the database.
Owner:ZHEJIANG UNIVIEW TECH CO LTD

Preparation method for double-layer carbon coated metal sulfide composite electrode material with core-shell structure

The invention discloses a preparation method for a double-layer carbon coated metal sulfide composite electrode material with a core-shell structure. An amorphous carbon material is arranged on an outer layer of the composite electrode material and a nitrogen-doped carbon coated metal sulfide is arranged on an inner layer. The preparation method disclosed by the invention is simple and feasible. The double-layer carbon coated metal sulfide composite electrode material with the core-shell structure is acquired according to the following steps: adopting a room temperature aggregation method foracquiring a polypyrrole coated Co9S8 precursor, and then taking a shielding gas as a carrier gas for uniformly filling ethyl alcohol into a tube furnace, and performing thermal treatment. When the composite material prepared according to the method is used as a cathode material of a lithium ion secondary battery, the outer layer carbon is capable of effectively inhibiting the direct contact between active material metal sulfide and electrolyte, so that the initial coulombic efficiency and cycle performance of the composite material are promoted. Meanwhile, the nitrogen-doped carbon material isintroduced, so that the conductivity of the material is further promoted, the huge volume expansion of the metal sulfide in charging and discharging processes is relieved and the structural stabilityand rate capability of the composite material are greatly improved.
Owner:CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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