The invention relates to a seismic system having an array of nodes, each capable of emitting and detecting seismic signals. The vehicle control apparatus includes an eco-run system that automatically stops the engine when an automatic stop condition is established and restarts the engine when a restart condition is established, a throttle motor that opens and closes a throttle valve adjusting air amount to be sucked into the engine, and a vehicle speed sensor that detects the vehicle speed. Control information corresponding to the determined controlled device is generated and output to, for example, a remote controller, and device control is performed based on a control signal from the remote controller. One application of this sensor may be for ground water testing via a narrow well casing. If a difference between the stored copies is detected, then the dirty indicator can be take as being unreliable and remedial action can be taken. Acyloxyalkyl carbamate prodrugs of \u03b1-amino acids suitable for oral administration using sustained release dosage forms are also disclosed.