A robust fault diagnosis and validation strategy for temperature sensors and ow meters in central chilling plant is developed, which is based on the rst law of thermodynamics. The strategy evaluates soft sensor faults (biases) by examining and minimizing the sum of the squares of concerned mass or steady state energy balance residuals represented by the corrected measurement over a period. It c...

A technique which yields fast parallel algorithms for several z ero-one supplydemand problems is presented. We give NC algorithms for the following related problems: (1) Given a sequence of supplies a 11 .•. ,an and demands b1 , ... ,bm, construct a zero-one flow pattern satisfyiag these constraints, whe re every supply vertex can send at most one unit of flow to each demand vertex. (2) Given a...

In this paper we prove that each element of any regular Baer ring is a sum of two units if no factor ring of R is isomorphic to Z_2 and we characterize regular Baer rings with unit sum numbers $omega$ and $infty$. Then as an application, we discuss the unit sum number of some classes of group rings.