Constructing insecurity: Australian security discourse and policy post-2001

This article explores the construction of security in the contemporary Australian context, arguing that the Australian government has represented, and attempted to construct support for, a statist, exclusionary and militaristic conception or discourse of security. This understanding of security is evident in the government’s representation and response to a range of issues since 2001, including asylum-seekers, terrorism and the war in Iraq. In exploring the processes through which the Australian government has elaborated this discourse and sought to create resonance for it in a domestic context, I argue that there remain important bases not simply for contesting this conception of security, but for acknowledging immanent possibilities for the understanding of security in the Australian context to change in normatively progressive ways. Acknowledging these possibilities is important in identifying the potential for progressive change in Australian security policy, while also shedding light on the role of security in the modern political project

Ethics and exclusion: representations of sovereignty in Australia’s approach to asylum-seekers

From 2001, the Australian government has justified a hard-line approach to asylum-seekers on the basis of the need to preserve its sovereignty. This article critically evaluates this justification, arguing that the conception of sovereignty as the ‘right to exclude’ involves a denial of responsibility to the most vulnerable in global politics. We particularly focus here on the ways in which the Australian government has attempted to create support for this conception of sovereignty and ethical responsibility at the domestic level, through marginalising alternative voices and emphasising the ‘otherness’ of asylum-seekers and refugees. We conclude by suggesting what this might mean for the treatment of asylum-seekers in global politics and for statist approaches to global ethics

Packing Steiner Trees

Let $T$ be a distinguished subset of vertices in a graph $G$. A $T$-\emph{Steiner tree} is a subgraph of $G$ that is a tree and that spans $T$. Kriesell conjectured that $G$ contains $k$ pairwise edge-disjoint $T$-Steiner trees provided that every edge-cut of $G$ that separates $T$ has size $\ge 2k$. When $T=V(G)$ a $T$-Steiner tree is a spanning tree and the conjecture is a consequence of a classic theorem due to Nash-Williams and Tutte. Lau proved that Kriesell's conjecture holds when $2k$ is replaced by $24k$, and recently West and Wu have lowered this value to $6.5k$. Our main result makes a further improvement to $5k+4$.Comment: 38 pages, 4 figure

A note on forbidding clique immersions

Robertson and Seymour proved that the relation of graph immersion is well-quasi-ordered for finite graphs. Their proof uses the results of graph minors theory. Surprisingly, there is a very short proof of the corresponding rough structure theorem for graphs without $K_t$-immersions; it is based on the Gomory-Hu theorem. The same proof also works to establish a rough structure theorem for Eulerian digraphs without $\vec{K}_t$-immersions, where $\vec{K}_t$ denotes the bidirected complete digraph of order $t$

Application of an Extremal Result of Erdős and Gallai to the (n,k,t) Problem

An extremal result about vertex covers, attributed by Hajnal to Erdős and Gallai, is applied to prove the following: If n, k, and t are integers satisfying n ≥ k ≥ t ≥ 3 and k ≤ 2t - 2, and G is a graph with the minimum number of edges among graphs on n vertices with the property that every induced subgraph on k vertices contains a complete subgraph on t vertices, then every component of G is complete

The DELTA MONSTER: An RPV designed to investigate the aerodynamics of a delta wing platform

The mission requirements for the performance of aerodynamic tests on a delta wind planform posed some problems, these include aerodynamic interference; structural support; data acquisition and transmission instrumentation; aircraft stability and control; and propulsion implementation. To eliminate the problems of wall interference, free stream turbulence, and the difficulty of achieving dynamic similarity between the test and actual flight aircraft that are associated with aerodynamic testing in wind tunnels, the concept of the remotely piloted vehicle which can perform a basic aerodynamic study on a delta wing was the main objective for the Green Mission - the Delta Monster. The basic aerodynamic studies were performed on a delta wing with a sweep angle greater than 45 degrees. These tests were performed at various angles of attack and Reynolds numbers. The delta wing was instrumented to determine the primary leading edge vortex formation and location, using pressure measurements and/or flow visualization. A data acquisition system was provided to collect all necessary data