S2-05 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 Initiation Protocol (sip) Session Mobility Draft-shacham-sipping-session-mobility-05

Session mobility is the transfer of media of an ongoing communication session from one device to another. This document describes the basic approaches and shows the signaling and media flow examples for providing this service using the Session Initiation Protocol (SIP). Service discovery is essential to locate targets for session transfer Shacham, et al. Expires May 21, 2008 [Page 1] Internet-D...

Session 2

Proposal for a Tutorial Session at CDC-ECC’05

Hybrid systems have been an active area of research for a number of years. Recently a consensus is beginning to emerge among researchers about theoretical and applied problems related to control of hybrid systems that are both important and tractable. In this overview paper we survey recent research advances and highlight some of the open problems.

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...