Accession Number : ADA309424

Title :   Continuous-Overnight Observation of Human Tooth Eruption.

Descriptive Note : Doctoral thesis,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH

Personal Author(s) : Risinger, Ronald K.

PDF Url : ADA309424

Report Date : 1996

Pagination or Media Count : 256

Abstract : Real-time computing systems perform work in the face of time constraints generated by external events, environmental factors, or interactions with other computers. In real-time systems, the correctness of applications depends not only on the logical computation being performed, but also on the time at which results are produced. Real-time systems fall into two basic categories - hard and soft. A hard real-time system has 'hard' program execution deadlines that the computer must meet or catastrophic consequences could result. Soft real-time systems also have execution deadlines, but if missed, don't result in catastrophe. Rather, the value of the result diminishes as time progresses. Since real-time systems have fixed deadlines, it's essential for program execution times to be predictable so the computer's resources can be effectively scheduled to meet those deadlines. In addition, designers and programmers must know the execution time of individual tasks to determine if specific routines can meet the application's real-time requirements. For these reasons, hardware resources that may lead to unpredictable variations in program execution time are usually not allowed. One such resource is the hierarchical memory subsystem. Hierarchical memories are used to improve the overall performance of the system

Descriptors :   *SYSTEMS ENGINEERING, *REAL TIME, *COMPUTER ARCHITECTURE, *MEMORY DEVICES, *HIERARCHIES, COMPUTER PROGRAMS, ALGORITHMS, COMPUTERIZED SIMULATION, REQUIREMENTS, ENVIRONMENTS, COMPUTERS, RESOURCES, EXTERNAL, PROGRAMMERS.

Subject Categories : Computer Programming and Software
      Computer Hardware
      Computer Systems

Distribution Statement : APPROVED FOR PUBLIC RELEASE