Can mental imagery be incorporated uniformly into a cognitive architecture by leveraging the mixed (relational and probabilistic) hybrid (discrete and continuous) processing supported by factor graphs? This article takes an initial step towards answering this question via an implementation in a graphical cognitive architecture of a version of the Eight Puzzle based on a hybrid function represen...

Informally, a set of abstractions of a state space S is additive if the distance between any two states in S is always greater than or equal to the sum of the corresponding distances in the abstract spaces. The first known additive abstractions, called disjoint pattern databases, were experimentally demonstrated to produce state of the art performance on certain state spaces. However, previous ...

We study a construction of the Mathieu group M12 using a game reminiscent of Loyd’s “15-puzzle”. The elements of M12 are realized as permutations on 12 of the 13 points of the finite projective plane of order 3. There is a natural extension to a “pseudogroup” M13 acting on all 13 points, which exhibits a limited form of sextuple transitivity. Another corollary of the construction is a metric, a...

Room Types Executive Room (Queen size bed / Standard Room (Queen size bed / Bath tub Deluxe Room (Queen size bed / Bath tub Deluxe Double Room (King size bed) Bussiness Room (Twin bed) Family Room (Queen size bed*2) All rooms will be provided with: 1. Two bottles of water each day 2. Free wired/cordless internet access 3. Free instant coffee/tea bag 4. A breakfast each day 5.Free self-laundry s...

Queens of the primitively eusocial wasp Ropalidia marginata appear to maintain reproductive monopoly through pheromone rather than through physical aggression. Upon queen removal, one of the workers (potential queen, PQ) becomes extremely aggressive but drops her aggression immediately upon returning the queen. If the queen is not returned, the PQ gradually drops her aggression and becomes the ...

world's history presents only during occasional long periods of widespread prosperity, to Mr. Lytton's eyes her personal influence does not account either for the great events that happened in her time or for the eminence of the chief characters which surrounded her. We see in his biography, what is lacking in the earlier book, a sincere attempt to refrain from belittling his subject, but certa...

Immigration to the UK has risen in the past 10 years and has had a measurable effect on the supply of different types of labour. But, existing studies of the impact of immigration on the wages of native-born workers in the UK (e.g. Dustmann, Fabbri and Preston, 2005) have failed to find any significant effect. This is something of a puzzle since Card and Lemieux, (2001) have shown that changes ...

We study a construction of the Mathieu group M12 using a game reminiscent of Loyd’s “15-puzzle”. The elements of M12 are realized as permutations on 12 of the 13 points of the finite projective plane of order 3. There is a natural extension to a “pseudogroup” M13 acting on all 13 points, which exhibits a limited form of sextuple transitivity. Another corollary of the construction is a metric, a...

A heuristic improvement technique referred to as multi-dimensional heuristics is presented. Instead of only applying the heuristic between two states X 1 and X 2 , when a distance esti­ mate of X 1 X 2 is needed, this technique uses a reference state R and applies the heuristic func­ tion to {X 1 ,R) and (X' 2 ,R) and compares the resulting values. If two states are close to each other, then th...