A b s t r a c C A number of well known methods exist for solving Markov Decision Problems (MDP) involving a single decision-maker with or without model uncertainty. Recen tly, there has been great ilerest in the multi-agent version of the problem where there are multiple interacting decision makers. How ever, most of the suggested methods for multi-agent MDP's require complete knowledge concerning the state and action of all agents. This, in turn, results in a large communication overhead when the agerts are physically distributed. In this paper, we address the problem of coping with uncertainty regarding agent states and action with different amounts of communication. In particular, assuming a known model and common reward structure, hidden markov models and techniques for partially observed MDP's are combined t o estimate the states or actions (or both) of other agents. Simulation results are presented t o compare the performances that can be realized under differen t assumptions on agert communications.

A Chalconyl homologous series: RO-C6H4-CH=CH-CO-C6H4-OC14H29(n) (meta) is synthesized and studied with a view to understand and establish the effect of molecular structure on Liquid crystal behaviour by reducing molecular rigidity through diminishing of a phenyl ring and a central carboxy or vinyl carboxy group from a molecule. Novel series consists of thirteen homologues (C1to C18). First member (C1) homologue is nonliquid crystal and the rest of the homologues (C2to C18) are enantiotropically ( C2to C5) nematogenic or monotropically (C6to C18) nematogenic plus smectogenic of low mesophaselengths and low transition temperatures ( 38°C to 76°C). Transition temperatures were determined by an optical polarizing microscopy (POM) equipped with a heating stage. Cr-N/I, N-I, I-N, N-Sm transition curves behaved in normal manner in a phase diagram. N-I and I-Sm transition curves exhibited odd-even effect. Textures of nematic phase are threaded or schlieren and that of the smectic phase are of the type A or C. Analytical, spectral and thermal data supported molecular structure of homologues. Thermal stability ( N-I/ I-N) of series for nematic is 67.5°C and that of the smectic is very low. Group efficiency order derived on the basis of thermal stability is as under. –Cl with –C6H4.COO- > -OC14H29(n) without –C6H4.COO-with reference to central bridge –CH=CH-CO-.

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