Abstract. In this paper, we considered previously existing multicast routing algorism and protocol and especially put more attention on CBT routing protocol to analyze its strength and weakness. As a result, traffic was converged upon core router because of structural problem of CBT protocol and according to the converged traffic, there was congestion at the core link, thus it caused efficiency degrades of the whole routing. Therefore, we proposed a way of conversion to Anycast Routing method from the method of CBT multicast tree routing that was suitable for traffic decentralization even though there was high bandwidth depended on increment of traffic load. In order to support multimedia service that requires from small to large bandwidth and to consider multicast routing protocol to improve characteristic of multicast packet's delay, CBT/Anycast routing method can be proposed as an alternative plan for freedom of bandwidth in traffic.

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Abstract. Damage caused by spontaneous ignition in coal stockpile is proportional to the increase in coal thermal power plant. The problem of spontaneous ignition is not only severe economic damage but also a typical plant damage caused by harmful gases generated during the fire. Because coal is porous, it causes oxygen to be absorbed in the amount of oxygen per unit weight of oxygen, resulting in low humidity and low thermal conductivity. The cause and effect of spontaneous ignition are very complex, so it is difficult to prevent it beforehand and once it is difficult to digest it, it is difficult to digest it. This study examines structural stability by conducting a structural analysis of the cooling ball system to prevent spontaneous combustion of coal stockpile plants and external pressures.