A Multi-Agent Approach to Design a WLAN System

There have been a number of research works that investigate the use of formal optimization techniques for the accurate design of WLAN. Unfortunately, these approaches may not be effectively applied to a large scale WLAN deployment scenario. Consequently, it is necessary to design an algorithm that has more powerful ability of global optimization to solve such problems. The main contribution of the work presented in this paper is designing a multi-agent optimization algorithm based on the local control from agents and global control from system, including the synthetical analysis of the relationship of channel and field strength in WLAN. The results of experiments indicate that our multi-agent optimization algorithm is much more efficient comparing with the present agent-based algorithm for the practical engineering project with low density candidate sites scenarios

Experimental Investigation of Perceptual Characteristics of Functional Cemented Backfilling Materials in Coal Mines

For investigating perceptual stress characteristics of Functional Cemented Backfilling Materials (FCBM) in coal mines, we prepared functional specimens based on Cemented Backfilling Materials (CBM) with the perceptual stress ability, and clarified their conductive mechanism, perceptual mechanism, and possible engineering applications. Using mechanical tests and the network parallel dynamic method, the mechanical and electrical properties of the prepared materials and the perceptual characteristics under mechanical–electric coupling conditions were analyzed in depth. The test results demonstrate that the deformation of FCBMs obey standard stress–strain rules, while the conductive phase addition can deteriorate their mechanical properties and simultaneously enhance the electrical conductivity of materials. Through fitting, the percolation threshold was determined to be 9.85%. Before the failure, the spatial distribution of the apparent resistivity in the materials was shown to follow the X-shaped radial pattern; after the failure, the material apparent resistivity obeys different distribution rules at various stages. The apparent resistivity of FCBM is negatively correlated with the strain value at the elastic and plastic stages and positively correlated with it at the failure stage. When the graphite content exceeds the percolation threshold, the materials exhibit a favorable perceptual functionality at the elastic stage