A spasm in the feet or toe is called a carpopedal spasm. Carpopedal spasms are usually accompanied by numbness, tingling, or a âpins-and-needlesâ feeling. Muscle weakness, fatigue, cramping, twitching, and uncontrolled, purposeless, rapid movement are not an uncommon occurrence with carpopedal spasms either. Some common causes of spasms are: 1  Hypocalcemia (calcium deficiency) 2  Vitamin D deficiency. 3  Muscle cramps (Most often caused by sports or occupational muscle injury)
A remote terminal unit is a microprocessor-controlled electronic device that interfaces objects in the physical world to a distributed control system or SCADA system by transmitting telemetry data to a master system, and by using messages from the master supervisory system to control connected objects. Other terms that may be used for RTU is remote telemetry unit or remote telecontrol unit.
HRU. The HRU security model is an operating system level computer security model which deals with the integrity of access rights in the system. It is an extension of the Graham-Denning model, based around the idea of a finite set of procedures being available to edit the access rights of a subject on an object. It is named after its three authors, Michael A. Harrison, Walter L. Ruzzo and Jeffrey D. Ullman.