Grouping Factor

Abstract: A hierarchical QAM system allows the transmission of different sources by embedding the relative constellation points. A QAM transmitting system, includes a source of a level (1) and a level (2) data stream, each data stream carrying successive symbols. A hierarchical QAM transmitter, coupled to the level (1) and level (2) data stream source, generates a hierarchical QAM signal in which a level (1) symbol is represented by a data point in one of four quadrants in the I-Q plane, and a level (2) symbol is represented by the data point in one of four sub-quadrants surrounding a center point of the quadrant containing the level (1) data point. The level (2) data point is spaced away from the center point by a grouping factor set to more closely match the bit error rate performance of the level (1) and level (2) data streams.

Abstract: The invention relates to the technical field of lithium ion battery manufacturing, and particularly relates to a sorting and grouping method for lithium ion batteries. The sorting and grouping method is widely applied to sorting and grouping of battery packs of various types of electronic and electrical equipment such as small digital electrical appliances, electric bicycles and electric automobiles. The sorting and grouping method comprises the following steps: firstly, spraying codes on or numbering single batteries, and collecting first capacity, voltage and internal resistance of the single batteries; and aging the single batteries, collecting second voltage, internal resistance and recovery capacity of the single batteries, carrying out data statistics on grouping factors, establishing the grading standard of each grouping factor of the single batteries, determining the level of each grouping factor of each single battery, and selecting the grouping factors according to practical conditions to carry out sorting and grouping. The sorting process is simple, the requirement on sorting equipment is simple, and thus the sorting and grouping cost is reduced; the method has the function of preferably selecting battery packs with long service life, unqualified battery cores can be eliminated, and thus undesirable effects of produced battery packs can be reduced.

Abstract: The invention discloses a method for blocking and storing a stored file in a cloud storage system by adopting a dynamic adaptation method, and mainly aims to solve the problems of low space utilization rate and disk fragments caused by the use of a fixed block size in the prior art. The implementation scheme comprises the following steps of: setting a grouping factor vector by using the cloud storage system, obtaining the size and heat mark of a file when the file is to be stored, and when the size of the file is smaller than a minimum grouping factor, using the final size of the file; if the heat mark is 1, copying and storing the file, and on the contrary, directly storing the file on a single node; and when the size of the file is larger than the minimum grouping factor, comparing the size of the file with a grouping factor to obtain an optimal block size. Compared with the method using the fixed block size, the invention has higher file uniformity, can better solve a load balancing problem caused by hot files, and is particularly suitable for the cloud storage system.