Offsetting with Salinity Credits: An Alternative to Irrigation Zoning

Irrigation induced salinity is a serious problem in many countries around the world. In Australia, this type of salinity is most pronounced in the valley of the River Murray in South Australia. Location of irrigation enterprises has been identified as a key factor that needs to be taken into account by policies aimed at mitigating salinity. This article compares and contrasts two such policies: an irrigation zoning policy, where new irrigation enterprises are only allowed in low salinity impact zones, and an offsetting with salinity credits policy, where new irrigation enterprises can locate in high salinity impact zones, provided they offset their salinity impact with salinity credits. Key findings are that the offsetting policy will be both less costly and more effective in reducing salinity than a standalone irrigation zoning policy. This is due to the presence of incentives for choosing "optimal" location of irrigation enterprises when costs of salinity credits are taken into account.irrigation, least-cost, offsets, salinity, Land Economics/Use, Q15, Q18, Q25, Q50,

The Extreme Risk of Personal Data Breaches & The Erosion of Privacy

Personal data breaches from organisations, enabling mass identity fraud, constitute an \emph{extreme risk}. This risk worsens daily as an ever-growing amount of personal data are stored by organisations and on-line, and the attack surface surrounding this data becomes larger and harder to secure. Further, breached information is distributed and accumulates in the hands of cyber criminals, thus driving a cumulative erosion of privacy. Statistical modeling of breach data from 2000 through 2015 provides insights into this risk: A current maximum breach size of about 200 million is detected, and is expected to grow by fifty percent over the next five years. The breach sizes are found to be well modeled by an \emph{extremely heavy tailed} truncated Pareto distribution, with tail exponent parameter decreasing linearly from 0.57 in 2007 to 0.37 in 2015. With this current model, given a breach contains above fifty thousand items, there is a ten percent probability of exceeding ten million. A size effect is unearthed where both the frequency and severity of breaches scale with organisation size like $s^{0.6}$. Projections indicate that the total amount of breached information is expected to double from two to four billion items within the next five years, eclipsing the population of users of the Internet. This massive and uncontrolled dissemination of personal identities raises fundamental concerns about privacy.Comment: 16 pages, 3 sets of figures, and 4 table

Explaining cross-cultural pragmatic findings: moving from politeness maxims to sociopragmatic interactional principles (SIPs)

This paper focuses on how culture can be treated as an explanatory variable in cross-cultural pragmatic studies. It starts with a review of pragmatic maxims [Grice, H. Paul, 1989. Logic and Conversation. William James Lectures, 1967. (Reprinted in Grice, H.P. (Ed.), Studies in the Way of Words, pp. 22–40); Leech, Geoffrey N., 1983. Principles of Pragmatics. London: Longman; Journal of Pragmatics 14 (1990)237], discussing the strengths and weaknesses of the concept. It then presents the findings from a British-Chinese replication of Kim's [Human Communication Research 21(1996)128] cross-cultural study of conversational constraints, and argues that the notion of maxims should be reconceptualised as sociopragmatic interactional principles (SIPs). The notion of SIPs is defined and explained, referring to the sociopragmatic-pragmalinguistic distinction [Leech, Geoffrey N., 1983. Principles of Pragmatics. London: Longman; Applied Linguistics 4(1983)91] and other cross-cultural pragmatic approaches [House, Julianne, 2000. Understanding misunderstanding: a pragmatic-discourse approach to analyzing mismanaged rapport in talk across cultures. In: Spencer-Oatey, H. (Ed.), Culturally Speaking. Managing Rapport through Talk across Cultures. Continuum, London; 145–164; Journal of Pragmatics 9 (1985)145]. SIPs are also discussed in relation to Brown and Levinson's [Brown, Penelope, Levinson, Stephen C., 1987. Politeness. Some Universals in Language Usage. CUP, Cambridge (Originally published ad ‘Universals in language usage: politeness phenomenon’ In: Goody, E. (1987), Questions and Politeness: Strategies in Social Interaction. CUP, New York.)] perspectives on the impact of culture on language use. The paper ends with a call for more research to establish on an empirical basis the types of interactional principles that exist, and their interrelationships

Real-time growth rate for general stochastic SIR epidemics on unclustered networks

Networks have become an important tool for infectious disease epidemiology. Most previous theoretical studies of transmission network models have either considered simple Markovian dynamics at the individual level, or have focused on the invasion threshold and final outcome of the epidemic. Here, we provide a general theory for early real-time behaviour of epidemics on large configuration model networks (i.e. static and locally unclustered), in particular focusing on the computation of the Malthusian parameter that describes the early exponential epidemic growth. Analytical, numerical and Monte-Carlo methods under a wide variety of Markovian and non-Markovian assumptions about the infectivity profile are presented. Numerous examples provide explicit quantification of the impact of the network structure on the temporal dynamics of the spread of infection and provide a benchmark for validating results of large scale simulations.Comment: 45 pages, 8 figures, submitted to Mathematical Biosciences on 29/11/2014; Version 2: resubmitted on 15/04/2015; accepted on 17/04/2015. Changes: better explanations in introduction; restructured section 3.3 (3.3.3 added); section 6.3.1 added; more precise terminology; typos correcte

Video Stream Retrieval of Unseen Queries using Semantic Memory

Retrieval of live, user-broadcast video streams is an under-addressed and increasingly relevant challenge. The on-line nature of the problem requires temporal evaluation and the unforeseeable scope of potential queries motivates an approach which can accommodate arbitrary search queries. To account for the breadth of possible queries, we adopt a no-example approach to query retrieval, which uses a query's semantic relatedness to pre-trained concept classifiers. To adapt to shifting video content, we propose memory pooling and memory welling methods that favor recent information over long past content. We identify two stream retrieval tasks, instantaneous retrieval at any particular time and continuous retrieval over a prolonged duration, and propose means for evaluating them. Three large scale video datasets are adapted to the challenge of stream retrieval. We report results for our search methods on the new stream retrieval tasks, as well as demonstrate their efficacy in a traditional, non-streaming video task.Comment: Presented at BMVC 2016, British Machine Vision Conference, 201

Has the incidence of empyema in Scottish children continued to increase beyond 2005?

Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://group.bmj.com/group/rights-licensing/permissions.Peer reviewedPostprin