The standard method of measuring one-way delay and delay variance in the Internet uses synchronous techniques which require clock synchronisation between source and destination. In this paper, we propose an asynchronous method of measuring one way delay and delay variance in the Internet, which does not require clock synchronisation between source and destination. The proposed asynchronous meth...

The FreeBSD timecounters are an architecture-independent implementation of a binary timescale using whatever hardware support is at hand for tracking time. The binary timescale converts using simple multiplication to canonical timescales based on microor nano-seconds and can interface seamlessly to the NTP PLL/FLL facilities for clock synchronisation. Timecounters are implemented using lock-les...

We study a strategic game model on hypergraphs where players, modelled by nodes, try to coordinate or anti-coordinate their choices within certain groups of players, modelled by hyperedges. We show this model to be a strict generalisation of symmetric additively separable hedonic games to the hypergraph setting and that such games always have a pure Nash equilibrium, which can be computed in ps...

In this short paper we describe a Wide Area Audio Synchronisation demonstration using the Quality of Service (QoS) facilities of the Nemesis operating system. The Nemesis operating system is a result of the ESPRIT funded Pegasus I research project. A stereo audio stream is split with each channel being input to one of two distinct network digitisation devices; one of the resulting streams is se...

In each of the current stochastic process algebras all non-competitive interactions between components or agents are modelled using a single combinator, variously called the parallel, synchronisation or cooperation operator. This paper aims to compare the definitions of this combinator which have been used; in particular, looking at the different ways in which rates are associated with the acti...

This lecture deals with one of the fundamental issues encountered when constructing a system made up of independent communicating processes: dealing with time and making sure that processes do the right thing at the right time. In essence this comes down to allowing processes to synchronise and coordinate their actions. Coordination refers to coordinating the actions of separate processes relat...