We explore the issues concerning the support of reliable concurrent multicast in ATM networks. We provide motivation for using tree-based schemes versus receiver-initiated schemes, and compare variations on the fundamental tree-based scheme, showing the properties needed for an efficient reliable concast protocol for ATM. A new tree structure, called a feedback tree, is introduced for use in pa...

We present an analytical model for jets in Fanaroff & Riley Class I (FR I) radio galaxies, in which an initially laminar, relativistic flow is surrounded by a shear layer. We apply the appropriate conservation laws to constrain the jet parameters, starting the model where the radio emission is observed to brighten abruptly. We assume that the laminar flow fills the jet there and that pressure b...

We consider several types of internal queries: questions about subwords of a text. As the main tool we develop an optimal data structure for the problem called here internal pattern matching. This data structure provides constant-time answers to queries about occurrences of one subword x in another subword y of a given text, assuming that |y| = O(|x|), which allows for a constant-space represen...

The Lenses Structure & Dynamics (LSD) Survey aims at studying the internal structure of luminous and dark matter – as well as their evolution – of field earlytype (E/SO) galaxies to z ∼ 1. In particular, E/S0 lens galaxies are studied by combining gravitational lensing, photometric and kinematic data obtained with ground-based (VLA/Keck/VLT) and space-based telescopes (HST). Here, we report on ...

We present the results of a study comparing three directed-edge representations in node-link diagrams. Node-link diagrams are probably the most popular type of graph representations; nodes are depicted as dots and links as straight or curved lines connecting the nodes. An arrowhead placed at the end point of a link is traditionally used to indicate edge direction. However, Holten and Van Wijk [...

The moorland rescue team takes itself seriously, and many walkers have reason to be grateful for their dedication. The team practice at weekends, and on Saturday evening it is not unusual to see them in the local pub. They are not hard to spot: their shirts and jackets are festooned with brightly coloured ropes and other equipment. The object pictured on the cover of Mathematics Today this mont...

Suppressing or mitigating signal distortion due to group velocity dispersion and optical Kerr effects is necessary in ultrahigh speed and long-haul wavelength division multiplexing (WDM) transmission systems. Dispersion management (DM), optical phase conjugation (OPC), and the combination of these two are promising techniques to compensate for signal distortion. In this paper, to implement a fl...

Optical modulators are key components to realize photonic circuits, and Mach-Zehnder modulators (MZM) are often used for high speed short reach interconnects. In order to maximize the tolerable path loss of a transmission link at a given bitrate, the MZM needs to be optimized. However, the optimization can be complex since the overall link performance depends on various parameters, and, for the...

This paper addresses first the problem of max-min fair (MMF) link transmissions in wireless sensor networks (WSNs) and in a second stage studies the joint link scheduling and transmission power assignment problem.Given a set of concurrently transmitting links, the MMF link transmission problem looks for transmission powers of nodes such that the signal-to-interference and noise ratio (SINR) val...

Initial dislocation structure in annealed high-purity Mo single crystals and deformation substructure in a crystal subjected to 1% compression have been examined and studied using transmission electron microscopy (TEM) techniques in order to investigate dislocation multiplication mechanisms in the early stage of plastic deformation. The initial dislocation density is in a range of 10 ∼ 10 cm, a...