This paper analyzes the complexity-performance trade-off of several heuristic near-optimum multiuser detection (MuD) approaches applied to the uplink of synchronous single/multiple-input multiple-output multicarrier code division multiple access (S/MIMO MC-CDMA) systems. Genetic algorithm (GA), short term tabu search (STTS) and reactive tabu search (RTS), simulated annealing (SA), particle swar...

Hydrophobically modified ethoxylated urethanes have been synthesized using polyethylene glycol, hexamethylene diisocyanate and cetyl alcohol. These types of thickeners are categorized as nonionic associative thickeners. The HEURs were prepared in two steps. Initially an ethoxylated urethane prepolymer was synthesized through a reaction between a polyethylene glycol (Mn=6000) and hexamethylene d...

Perhaps of aI/the orgoll syslems Ihe cemralncnous system (eNS) is the 11105/ complex and difficult fO underslond. Physicians have been struggling from the dawn of /he medical history /0 grasp (he fllndamellta's of (he eNS and ils disease process. Time ond again relemless trials of lIew methods hove emerged. The experience gained over Ihe decodes along wilh Ihe improvement ill equipment and othe...

This paper shows the main character istics of Ar tificial intelligence planner which is par t of INDIGO system’s proposal, a planning system for OWL­S Web services composition. This system allows constructing on incremental way within Semantic Web an OWL­S Web services composition plan which can be executed on concur rent way dur ing its composition. The characte...

The author’s original state-space learning system (based on a probabilistic performance measure clustered in feature space) was effective in optimizing parameterized linear evaluation functions. However, more accurate probability estimates would allow stabilization in cases of strong feature interactions. To attain this accuracy and stability, a second level of learning is added, a genetic (par...

We present a detailed experimental comparison of interleaved depth-rst search and depth-bounded discrepancy search, two tree search procedures recently developed with the same goal: to reduce the cost of heuristic mistakes at the top of the tree. Our comparison uses an abstract heur-istic model, and three diierent concrete problem classes: binary constraint satisfaction, quasigroup completion a...

A suitable reaction system, and proper conditions were designed to produce desirable polyurethane base thickener with a calculated number average molecular weight. Initially an ethoxylated urethane prepolymer was synthesized by reaction of a polyethylene glycol (M„=6000) and dicyclohexylmethane diisocyanate using the step growth polymerization technique. Modification was carried out by reaction...