A chemical mechanical planarization system having a polishing pad, a carrier plate and a wafer plate is provided with an active gimbal. In an embodiment, exceptions that repeatedly occur at the same source and location within the source are logged on the first occurrence, and not logged thereafter. The different times at which the transmission is received at different access points can be collected and forwarded to a server, which can compute the location of the wireless device using triangulation techniques. The plurality of distributed application stacks are deployed in the plurality of clusters. An AT receiving forward link signals from multiple ATs identifies the AT associated with the highest quality forward link signal. There is provided a method of storing a gas hydrate in which pellets obtained by compression molding of powdery gas hydrate are conveyed into a storage tank by the use of a slurry liquor, which method includes pouring a liquid for impact absorption in advance into the storage tank so that the impact on the pellets charged in the storage tank is absorbed by the liquid for impact absorption.