Format for a graphical communication protocol

Abstract

A Format for a Graphical Communication Protocol STATUS OF THIS MEMOThis paper describes the requirements for a graphical format on which to base a graphical on-line communication protocol. The proposal is an Interactive Graphical Communication Format using the GKSM session metafile. Distribution of this memo is unlimited. ABSTRACTThis paper describes the requirements for a graphical format on which to base a graphical on-line communication protocol. It is argued that on-line graphical communication is similar to graphical session capture, and thus we propose an Interactive Graphical Communication Format using the GKSM session metafile.We discuss the items that we believe complement the GKSM metafile as a format for on-line interactive exchanges. One key application area of such a format is multi-media on-line conferencing; therefore, we present a conferencing software architecture for processing the proposed format. We make this format specification available to those planning multi-media conferencing systems as a contribution toward the development of a graphical communication protocol that will permit the interoperation of these systems.We hope this contribution will encourage the discussion of multimedia data exchange and the proposal of solutions. At SRI, we stay open to the exploration of alternatives and we will continue our research and development work in this problem area. ACKNOWLEDGEMENTSThe author wants to thank Andy Poggio of SRI who made many insightful and valuable suggestions that trimmed and improved level U. His expertise in multi-media communication systems and his encouragement were a most positive input to the creation of this IGCF. Dave Worthington of SRI also participated in the project discussions involving this IGCF. Thanks are also due to Tom Powers, chairman of ANSI X3H33, who opened this forum to the presentation of an earlier version of this paper, thereby providing an opportunity for the invaluable feedback of the X3H33 members. Jon Postel of ISI recommended a number of changes that made this paper more coherent and accessible.

On the massive gluon propagator, the PT-BFM scheme and the low-momentum behaviour of decoupling and scaling DSE solutions

“…In particular, solutions obtained by keeping the zero-momentum value of the gluon propagator fixed (see lefthand plots of fig. 1) while α(µ 2 = 100 GeV 2 ) is ranging from 0.15 to 0.1817 are available [13] and can be confronted to the asymptotical expressions derived in the previous section.…”

“…There appears to be a critical value of the coupling, α crit = α(µ 2 ) ≃ 0.182 with µ = 10 Gev, above which the coupled DSE system does not converge any longer to a solution [13]. As a matter of the fact, we know from eq.…”

“…Then, a massive gluon propagator, as lattice solutions points to and as required in ref. [4,13], cannot appear as a scaling solution. The same has been already proven in literature by applying different truncation schemes and also on general grounds, and indeed agrees with the very well-known infrared behaviour obtained from the coupled DSE system in refs.…”

“…Now, we can perform a more complete analysis by studying again the dressing function computed by solving eq. (19) for the different values of the coupling, α = α(µ 2 ), at µ 2 = 100 GeV 2 [13]. A ghost dressing function at vanishing momentum, F (0, µ 2 ), diverging as α → α crit had to be expected, one could try the following power behaviour,…”

“…In the present note, the work of ref. [1] will be extended by the analysis of the results [13] obtained by solving the coupled system of Landau gauge ghost and gluon propagators DSE within the framework of the pinching technique in the background field method [14] (PT-BFM). Our main goal is investigating whether the same pattern for regular (decoupling) and critical (scaling) solutions in ref.…”