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Algebra system is a structural model based on concept lattice, and it is a newly developing structural model which needs further enhancement and extension, so it need take more time to research and exploration. For the above missing point, firstly, this paper explained the N algebra system, W algebra system and algebra system in cognitive informatics. Secondly, it discussed comparative analysis among above three core contents of algebra system. Finally, it proved N algebra system belongs to W algebra system. The conclusions of this paper lay a solid foundation and support for further develop of algebra system. [ABSTRACT FROM AUTHOR]

Faced with the aircraft landing scheduling in the air traffic management, this paper proposed a hybrid algorithm (AFPSO) for scheduling arrival aircrafts with the least total delay. AFPSO algorithm combined the advantages both of artificial fish swarm algorithm (AFSA) and particle swarm optimization (PSO), searched satisfactory solution domain by AFSA and searched exact solution by PSO. The simulation results show that the AFPSO decreases the total delay time for single and double runways by 20. 9% and 34. 4% compare with first-come-first-serve (FCFS), by 3. 2% and 3. 5% compare with AFSA. A satisfactory solution of this AFPSO can provide real-time support for automatic air traffic management. [ABSTRACT FROM AUTHOR]