Many applications require that we learn the pa­ rameters of a model from data. EM (E xpectation­ Maximization) is a method for learning the pa­ rameters of probabilistic models with missing or hidden data. There are instances in which this method is slow to converge. Therefore, sev­ eral accelerations have been proposed to improve the method. None of the proposed acceleration methods are theore...

Process communication graph (PCG) is the visual formalism used in a graph-based visual language (VL) for parallel programming. It combines control flow and data flow graphs into a single visual formalism, and supports different levels of abstraction at which parallel programs are expressed and moves to compositional programming. Empirical studies allow designers to put their designs to test in ...

Several empirical methods for flood flow rate estimation have been presented. In this study,eight new empirical runoff estimation method including Dredge & Burge, Bourges, Inglis, Faning, Hyderabad, Burkli Ziegler, Cramar and Possenti were calculated in Bakhtegan watershed which is located in Fars province. After studying empirical methods for annual flood flow rate estimation and comparing the...

Several empirical methods for flood flow rate estimation have been presented. In this study,eight new empirical runoff estimation method including Dredge & Burge, Bourges, Inglis, Faning, Hyderabad, Burkli Ziegler, Cramar and Possenti were calculated in Bakhtegan watershed which is located in Fars province. After studying empirical methods for annual flood flow rate estimation and comparing the...

The paper describes an empirical study O/software maintenance that was carried out in a system software department in 1989 and 1990. The study Jocused on error occurrence andJault detection. Over 400 problem reports were studied. The study showed some unexpected results. It showed, for example, no relation between the phase of error occurrence and the solution time. An explanation is the gap be...

Now that we have safely made our way through the combinatorial forests of Vapnik–Chervonenkis classes, we will look at an interesting application of the VC theory to a problem in communications engineering: empirical design of vector quantizers. Vector quantization is a technique for lossy data compression (or source coding), so we will first review, at a very brisk pace, the basics of source c...

urinary tract infection (uti) is a neonatal life threatening infection which is usually treated with ampicillin plus an aminoglycoside or a third-generation cephalosporin. recently, growing number of escherchia coli species resistant to ampicillin and aminoglycosides have raised concerns regarding the necessity to change the empirical therapy. this motivates us to determine neonatal uti clinica...

The constraint satisfaction community has developed a number of heuristics for variable ordering during backtracking search. For example, in conjunction with algorithms which check forwards, the Fail-First (FF) and Brelaz (Bz) heuristics are cheap to evaluate and are generally considered to be very eeective. Recent work to understand phase transitions in NP-complete problem classes enables us t...