Efficient production testing is frequently hampered because current digital circuits require test sets which are too large. These tesi sets can be reduced sign&cantly by means of Test Point Insertion (TPI). The state-of-the-art TPI methods only focus on solving one or two possible testability problems, and sometimes even fail to result in iest set size reduction because they focus on the wmng tesiability problem. In ihis paper we propose two TPI pre-process methods that analyze the circuit and select the TPI method that will focus on the testability problems ihat really exist. Experimental results indicate that with these pre-processes better tesi set size reduciions can be achieved.Gate-delay fault ATPG test .sets tend to be even larger than stuck-at fault ATPG test sets. In this paper we have evaluated ihe impact of TPI on gate-delay fault test sets. Experimenial results indicate ihat TPI also results in a sign@cant test set size reduction for gate-delay fauli ATPG.
The application of an active fast-responding heat flux sensor to time-dependent heat flux measurements was studied for two aero-dynamically interfering wall-mounted cubes. This sensor was in-house made and it consisted of a heated thin platinum film deposited on an insulating substrate of glass. The frequency response of the sensor was determined from a calibration with chopped laser beams and with responses to on forehand known periodic oscillations in the flow. The purpose of the study was to measure possible correlation between the vortex shedding, induced at the upstream cube in the tandem, and the convective heat flux from the side faces of the downstream cube. This implied that we were mainly interested in detecting possible characteristic frequencies carried by the time-dependent heat flux signal rather than determining the absolute value of the time-dependent convective heat flux. The results showed maxima in the power density spectra of the heat flux signal at frequencies which were in good agreement with the shedding frequencies found in the corresponding velocity spectra.
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