Computer interfaces

Many image processing applications can exploit high degree of data locality and parallelism to improve performance. Customized massively parallel computing hardware provides expensive but the most efficient solution as far as performance is concerned. Now-a-days high bandwidth network with high performance workstations are becoming economical and are widely available. Hence, better performance-to-cost ratio can be achieved by implementing message passing paradigm of parallel processing. Parallel edge detector was developed using message passing interfaces on cluster of workstations. This thesis discussed performance evaluation in terms of execution time, speedup, and efficiency for tasks with different computational intensities. Effects of sequential I/O component and load balancing are also discussed.

This thesis evaluates the performance of the D-channel which is part of the Basic Rate interface in an Integrated Services Digital Network (ISDN). A channel is a specified portion of the information-carrying capacity of the interface. The Basic Rate interface supports three channels; two B-channels and one D-channel. As ISDN user, physically connected on a passive bus, contends and resolves access for the D-channel, or signalling channel. In this thesis the D-channel and the contention resolution are modeled and simulated as a queueing system. Simulation results using the non-preemptive priority queueing discipline with deterministic and truncated exponential service times are presented. Performance is measured in terms of delay and queue length characteristics.

The STS 6003500 computerized automatic teat set is used to support the
AH/ASN-91 computer used in the Navy's A-7 attack aircraft. The teat set
currently loads teat programs from an IBM 2415 Magnetic tape unit which
is obsolete. A new memory loader system is needed to load test programs
into the teat set. Using modern Personal Computer technology, this can
be accomplished economically with a personal computer and a hard disk
drive. The personal computer will act as an intelligent interface
between the bard disk drive and the teat set. The personal computer can
also provide numerous functions for the convenience of the teat set
operator. The flexibility of the personal computer allows easy
adaptation to other computerized automatic test sets which are faced
with similar problems.