This paper describes our work at the fifth NTCIR workshop on the subtasks of single language information retrieval (SLIR). Several automatic global query expansion strategies were explored based on a machine-derive thesaurus. These term selection strategies were compared with manual selection and local expansion. Experiments show that all the global expansion strategies perform worse than the s...

We derive a bosonic Hamiltonian from two dimensional QCD on the light-front. To obtain the bosonic theory we find that it is useful to apply the boson expansion method which is the standard technique in quantum many-body physics. We introduce bilocal boson operators to represent the gauge-invariant quark bilinears and then local boson operators as the collective states of the bilocal bosons. If...

The CDS track investigates methods that could help physicians find relevant medical cases for patients they are dealing with. Concept based representation has been shown to be effective in biomedical domain. However, the basic concept based retrieval method may not perform well because of the additional restriction on each clinical cases. Therefore, in this paper, we explored two external resou...

Recent developments in the oil industry show that downhole tubular expansion is highly attractive due to the fact that the technology contributes to economical savings and exploration efficiency. As the technology is new, however, there still remain many unsolved problems to achieve the optimal design and implementation of the technology. Primarily, there is a need to establish a thorough under...

Query expansion is a well known method to improve the performance of information retrieval systems. In this work we have tested different approaches to extract the candidate query terms from the top ranked documents returned by the first-pass retrieval. One of them is the cooccurrence approach, based on measures of cooccurrence of the candidate and the query terms in the retrieved documents. Th...

In this work we present a self-consistent cumulant expansion (SC-CE) and investigate its accuracy for the one-dimensional Holstein model with without phonon dispersion. We show that finite lattices sizes, numerical integration of SC-CE equations becomes unstable at long times. This defect is partially ameliorated when studying systems in thermodynamic limit, enabling demonstration corrects many...