Wireless sensor networks (WSNs) have attracted much attention in recent years. In the many-to-one WSNs, the nodes located around the sink relay the data from other sensor nodes, which depletes their energy more quickly, resulting in energy holes and hot spot areas. When an energy hole appears, data cannot be sent from other sensors to the sink even though most of the sensors still have energy. In this paper, we generally classified the schemes proposed for solving the energy hole problem. In addition, we investigated the basic mathematical modeling of network connectivity and coverage, energy consideration, and optimum width of coronas in the corona-based WSNs.
In this paper, a new method for line detection at sport images using multi-agent systems is proposed. For this purpose, we introduced some agents.Each agent can recognize special section of an image, for example one agent for recognition of sport image's background (green pixels) and another for recognition of images line (white pixels).The results show good performance with respect to other methods, for example, Hough algorithm. This method has many advantages such as simplicity and high speed implementation, availability of line and background separately, cancelation of unnecessary sections such as viewer sections and parallel implementation ability.
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