A carbon nanotube film supporting structure is provided. A user can therefore be notified of that the detected device is not connected through a transmission medium suitable for data communications. The catalyst is prepared via a method which comprises the preparation of at least one high purity iron precursor with or without an additional support material and which uses a nominal amount of water in the catalyst production. For the clock signals, a reading period and a transferring period appear alternately, and the frequency of the low frequency clock pulse signal in the transferring period is lower than that of the high frequency clock pulse signal in the reading period. The method embodiment of the invention comprises receiving a request for resources in the cluster environment, monitoring events after receiving the request for resources and based on the monitored events, dynamically modifying at least one of the request for resources and the cluster environment.