S2-02 SESSION 2

S2-bundles over 2-orbifolds

Let M be a closed 4-manifold with π = π1(M) 6= 1 and π2(M) ∼= Z, and let u : π → Aut(π2(M)) be the natural action. If π ∼= Ker(u) × Z/2Z then M is homotopy equivalent to the total space of an RP -bundle over an aspherical surface. We show here that if π is not such a product then M is homotopy equivalent to the total space of an S-orbifold bundle over a 2orbifold B. There are at most two such o...

Session 2

Abstracts—session 2

S — SESSION 2 Sunday 10 October 2004, 15.00–16.30 Prevalence and significance of neck node metastases from oesophageal and stomach cancer at presentation J F Griffith, A T Ahuja, A C W Chan, E Ng, S F Leung#, C N Ng, D K Leung, L T C Chow@ and S C S Chung Departments of Diagnostic Radiology and Organ Imaging, Surgery, #Clinical Oncology and @Anatomical and Cellular Pathology, Prince of Wales, C...

Session 2: Language Modeling

This session presented four interesting papers on statistical language modeling aimed for improved large-vocabulary speech recognition. The basic problem in language modeling is to derive accurate underlying representations from a large amount of training data, which shares the same fundamental problem as acoustic modeling. As demonstrated in this session, many techniques used for acoustic mode...

Session 2: Invited Overviews

By adopting the name Human Language Technology for one of its flagship programs, ARPA intended to included everything that is involved in understanding and/or generating natural human language. In the Information Age, more and more resources are being devoted to collecting, retrieving, and using information (text and speech) in digital form. The time is ripe to multiply the power of human-machi...