Data analysis device and method

A data analysis method for analyzing efficiency of an assembly line operation including a plurality of processes, the data analysis method comprising:

• acquiring log data indicating a history of the processes respectively performed for each time of the assembly line operation;
• and
• generating analysis information, based on information generated by a probability model to calculate probability distribution with respect to the assembly line, the analysis information indicating an analysis result of the history indicated by the log data,
• wherein the probability model
• generates process efficiency distribution and variation factor distribution, the process efficiency distribution indicating probability distribution of corresponding efficiency to each process in the assembly line operation, and the variation factor distribution indicating probability distribution of a factor in each process wherein the factor is probable to vary the efficiency of the assembly line operation, and
• generates work efficiency distribution, based on the process efficiency distribution and the variation factor distribution, the work efficiency distribution indicating probability distribution of the efficiency of the assembly line operation,
• wherein the analysis information is generated based on a difference between the work efficiency distribution and supplementary work efficiency distribution, and the supplementary work efficiency distribution is calculated by inputting observed efficiency or factor on at least one of the plurality of processes in the history indicated by the log data into the probability model as alternative of a corresponding part of the process efficiency distribution or the variation factor distribution.

A data analysis device for analyzing efficiency of an assembly line operation including a plurality of processes, the data analysis device comprising:

• an input interface configured to acquire log data indicating a history of the processes respectively performed for each time of the assembly line operation;
• and
• a control circuit configured to generate analysis information, based on information generated by a probability model to calculate probability distribution with respect to the assembly line operation, the analysis information indicating an analysis result of the history indicated by the log data,
• wherein the probability model is configured to:
• generate process efficiency distribution and variation factor distribution, the process efficiency distribution indicating probability distribution of corresponding efficiency to each process in the assembly line operation, and the variation factor distribution indicating probability distribution of a factor in each process wherein the factor is probable to vary the efficiency of the assembly line operation;
• and
• generate work efficiency distribution, based on the process efficiency distribution and the variation factor distribution, the work efficiency distribution indicating probability distribution of the efficiency of the assembly line operation, wherein
• the probability model is configured to generate further work efficiency distribution with observation of a specific factor, by using an observation value of the specific factor in the history indicated by the log data, instead of the variation factor distribution for the specific factor, and
• the analysis information includes information evaluating an influence of the factor on the efficiency of the assembly line operation according to a difference between the work efficiency distribution with the observation of the specific factor and the work efficiency distribution without the observation of the specific factor.