Abstract: Partially opaque intellectual property (IP) includes source code providing the IP functionality. Meta-comments (pragmas or attributes) are provided with the source code to enable visibility of one or more nodes in the IP. Aliasing of the visibility-enabled nodes may also be provided for using meta-comments in the IP source code. The visibility-enabled nodes may be used by system designers in debugging a system design in either a software simulation environment and/or in debugging of a hardware device implementing the partially opaque IP.

Abstract: Partially opaque intellectual property (IP) includes source code providing the IP functionality. Meta-comments (pragmas or attributes) are provided with the source code to enable visibility of one or more nodes in the IP. Aliasing of the visibility-enabled nodes may also be provided for using meta-comments in the IP source code. The visibility-enabled nodes may be used by system designers in debugging a system design in either a software simulation environment and/or in debugging of a hardware device implementing the partially opaque IP.

Abstract: Measurements of net thrust of an aeroengine on a thrust balance in a test cell must be corrected to gross thrust and it is also advantageous to detect changes in the airflows into and through the test cell of a magnitude sufficient to alter significantly the thrust correction factor. The invention can accomplish both these objectives by obtaining measures of the static pressures p.sub.i and p.sub.e in planes i and e respectively of the test cell using pressure probes 29 and 31, and utilizing the measures of p.sub.i and p.sub.e(a) in a function of the formD=f(p.sub.i, p.sub.e)where D is the thrust correction necessary to convert the net thrust reading on the thrust balance to gross thrust, and(b) to monitor variations of p.sub.i and p.sub.e with respect to the net thrust and detect such of these variations as are outside predetermined limits of variation, such detection indicating the occurence of changes in the characteristics of the airflows sufficient to alter significantly the value of D.