REALTIME WRITING SPECIALISTS, EXPERTS WITNESSES, IME DOCTORS and FORENSIC CONSULTANTS. (REALTIME)
An operation within a larger dynamic system is called a real-time operation if the combined reaction- and operation-time of a task is shorter than the maximum delay that is allowed, in view of circumstances outside the operation. The task must also occur before the system to be controlled becomes unstable. A real-time operation is not necessarily fast, as slow systems can allow slow real-time operations. This applies for all types of dynamically changing systems. The polar opposite of a real-time operation is a batch job with interactive timesharing falling somewhere in between the two extremes.
Alternately, a system is said to be hard real-time if the correctness of an operation depends not only upon the logical correctness of the operation but also upon the time at which it is performed. An operation performed after the deadline is, by definition, incorrect, and usually has no value. In a soft real-time system the value of an operation declines steadily after the deadline expires.
A typical example could be a computer-controlled braking system in a car. If the driver can stop a car before it hits a wall, the operation was in real-time; if the car hits the wall it was not. Many machines require real-time controllers to avoid "instability", which could lead to the accidental damage or destruction of the system, people, or objects.
Some real-time systems do not have such a constraint on delay as long as input data can be processed rapidly enough so that no backlog occurs. In a real-time Digital signal processing (DSP) system, the analyzed (input) and/or generated (output) samples (whether they are grouped together in large segments or processed individually) can be processed (or generated) continuously in the time it takes to input and/or output the same set of samples independent of the processing delay. Consider an audio DSP example: if a process requires 2.01 seconds to analyze or process 2.00 seconds of sound, it is not real-time. If it takes 1.99 seconds, it is (or can be made into) a real-time DSP process.
Expert in Industrial Engineering, Operations/Logistics Management, Automation Systems & Equipment, Material Handling Equipment, and MRP, WMS, DCS, MHS, and TMS Software Integration.
Find realtime experts and consultants for realtime litigation support at www.expertwitness.com. Available to be realtime expert witnesses and provide realtime forensic consulting in realtime litigation, in addition prepare realtime expert witness reports for use in deposition and/or in-court trial testimony.
