A crystal growth furnace for a compound semiconductor single crystal has: a small diameter section for placing a seed crystal therein; an increasing diameter section that has diameters to increase from the small diameter section to upward; and a constant diameter section that extends from the increasing diameter section to upward. The system and method provide trading anonymity and various filtering options for the members. The wireless sensor network permits the acquisition of a large number of distributed data points from plural system modalities, which, in turn, yields enhanced prediction accuracy and a reduction in false alarms. A true positive path identification unit generates a true positive node, and identifies a true positive path connecting a base node to the true positive node in the true positive transformed keyword tree. The apparatus allows quick, simple, safe and reliable sterilization. When a message is to be sent from, for example, a mobile station to the network server, a first authentication unit in the mobile station attaches to the message a message identification number that has been increased or incremented from the number attached to a previous message sent from the mobile station.