The diagnosis of``intermittent'' faults in dynamic systems modeled as discrete event systems is considered. In many systems, faulty behavior often occurs intermittently, with fault events followed by corresponding``reset'' events for these faults, followed by new occurrences of fault events, and so forth. Since these events are usually unobservable, it is necessary to develop diagnostic methodo...

We report the results of a survey about the software faults encountered during the testing phases in evolving a large real-time system. The survey was done in two parts: the first part surveyed all the faults that were reported and characterized them in terms of general categories of faults; the second part surveyed in depth the faults found in the design and coding phases. For the first part, ...

First order splay faults, as defined here, are secondary faults that form at acute angles symmetrically on either side of a primary fault of the same sense of shear. We show that these faults form when the primary fault becomes critically misaligned with the principal stresses such that splay fault formation, on the optimum plane for faulting, is favored. First order splay faults, in distinctio...

Rotor cage faults as broken rotor bars, increased bars resistance and end-ring faults can be caused by thermal stresses, due to overload, overheating and thus mechanical stresses, magnetic stresses and dynamic stresses due to shaft torques. Environmental stresses as contamination or abrasion also contributes to the rotor cage faults. The rotor cage faults can also lead to the shaft vibration an...

Linked faults are very important for memory testing because they reduce the fault coverage of the tests. Their analysis has proven to be a source for new memory tests, characterized by an increased fault coverage for a given test time. This paper presents an analysis of linked faults, based on the concept of fault primitives, such that the whole space of linked faults is investigated, accounted...

The most enigmatic problems with the nearly 200 salt domes pierced in the Persian Gulf and in the Zagros Mountain Ranges (ZMR) in southern Iran, a unique morphology in the world, have been the matter of this study, which is based on a combination of field work, enhancement of satellite and aerial photographs etc. In the ZMR, structural anomalies are frequently associated with similar facies dis...

Many fault tolerant (FT) multistage interconnection networks have been devised that tolerate one or more faults. It is shown that the effects of some realistic faults can propagate through multiple stages and cause non-faulty components to behave erroneously; such faults with side effects can cause "FT" networks to lose their fault tolerance capabilities even due to a single fault. The PASM pro...

This paper describes a method of identifying a set of crosstalk-induced delay faults which may need to be tested in synchronous sequential circuits. In this process, the false crosstalk-induced delay faults that need not (and/or can not) be tested in synchronous sequential circuits are also identify. Our method classifies the pairs of aggressor and victim lines, using topological information an...

Diagnosis is the task of explaining abnormal behaviors of systems like telecommunication, transportation or energy systems. Given a sequence of observations the problem is to determine, online, all faults that are in line with these observations. Many approaches tackle this problem but they either require domain expertise or a formal description of how observations and faults are connected. Thi...

Given a set of memory array faults the problem of computing an optimal march test that detects all speci-ed memory array faults is addressed. In this paper, we propose a novel approach in which every memory array fault is modeled by a set of primitive memory faults. A primitive march test is deened for each primitive memory fault. We show that march tests that detect the speci-ed memory array f...