A Weighted Relational Classification Algorithm Based on Rough Set is proposed in this paper. The relations of tables are classified in database, relational graph is converted into 0 - 1 matrix, the weight is calculated using UCINET; at the same time, different condition attributes are weighted differently by using attribute frequency of Rough Set. It is improved effectively. Experiments have proved that new classifier has good classification performance.

By studying the simulated process of teacher-to-teacher assessment, the article elaborates on the scientificity and objectiveness of the application of AHP in assessing teachers’ comprehensive working performance. Through computer programming, AHP is put into practice in the field of scientifically assessing teachers’ working performance. Furthermore, it argues for the application of database in managing and assessing data as well as computer software in evaluating and calculating. This software also is applicable to other kinds of multiple-objective decision-making and assessing.

Wireless technologies bring great convenience, but they also introduce many new risks and vulnerabilities. Based on explaining the most famous Wireless LAN standard, the 802.11 network security threats and preventive measures are given.