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With recent advances in information technologies such as global position system and mobile internet, a huge volume of spatio-textual objects have been generated from location-based services, which enable a wide range of spatial keyword queries. Recently, researchers have proposed a novel query, called Spatial Pattern Matching (SPM), which uses a pattern to capture the user's intention. It has been demonstrated to be fundamental and useful for many real applications. Despite its usefulness, the SPM problem is computationally intractable. Existing algorithms suffer from the low efficiency issue, especially on large scale datasets. To enhance the performance of SPM, in this paper we propose a novel Efficient Spatial Pattern Matching (ESPM) algorithm, which exploits the inverted linear quadtree index and computes matched node pairs and object pairs level by level in a top-down manner. In particular, it focuses on pruning unpromising nodes and node pairs at the high levels, resulting in a large number of unpromising objects and object pairs to be pruned before accessing them from disk. We experimentally evaluate the performance of ESPM on real large datasets. Our results show that ESPM is over one order of magnitude faster than the state-of-the-art algorithm, and also uses much less I/O cost. [ABSTRACT FROM AUTHOR]

This paper presents the findings of an exploratory case study that investigated factors affecting the retention and progression of postgraduate business students at a major Australian distance education university. The majority of prior research addressing student retention focuses on undergraduate on-campus students, while this research investigated the postgraduate distance education context. The findings of this research indicate that a range of factors, in many cases different to those identified in the student retention literature, impact upon retention and progression in this context. This paper concludes with implications for distance education providers and recommendations for further research. [ABSTRACT FROM AUTHOR]

Background: International drug law enforcement agencies have identified an apparent rise in high level drug traffickers choosing to deal in multiple different drugs. It is hypothesised that this may be a "deliberate modus operandi" and that the formation of "portfolios of trades" may make such traffickers more profitable, harmful and resilient to changes in drug supply and policing. In this paper we provide the first exploration of the extent, nature and harms of poly-drug trafficking at Australian borders.Methods: Two different methods were used. First, we used Australian Federal Police (AFP) data on all commercial level seizures at the Australian border from 1999 to 2012 to identify the proportion of seizures that were poly-drug and trends over time. Second, we used unit-record data on a sub-set of 20 drug trafficking cases and linked-cases (defined as the original drug trafficking case and all other criminal cases that were connected via common offenders and/or suspects) to compare the profiles of poly-drug and mono-drug traffickers, including: the total weight and type of drug seized, the value of assets seized, and the level of involvement in other crime (such as money laundering and corruption).Results: Between 5% and 35% of commercial importations at the Australian border involved poly-drug trafficking. Poly-drug trafficking occurred in almost every year of analysis (1999-2012), but it increased only slightly over time. Compared to mono-drug traffickers poly-drug traffickers were characterised by: larger quantities of drugs seized, larger networks, longer criminal histories and more involvement in other types of serious crime.Conclusion: Some fears about poly-drug traffickers may have been overstated particularly about the inherent escalation of this form of trafficking. Nevertheless, this suggests poly-drug traffickers are likely to pose added risks to governments and law enforcement than mono-drug traffickers. They may necessitate different types of policy responses. [ABSTRACT FROM AUTHOR]

Organisations are now turning their attention to business-to-employee (B2E) e-business systems upon exploiting the potentials of business-to-business (B2B) and business-to-consumer (B2C) aspects of e-business. The business literature and IT vendors-owned publications both contain many stories highlighting the benefits that organisations are likely to receive as a result of embracing B2E e-business systems. However, little is reported in the scholarly academic literature about the adoption of such systems. More specifically, it is not clearly known how organisations experience benefits, what impediments they encounter, and how they resolve those impediments associated with B2E systems adoption. To address this gap in the literature, this paper presents the experiences of two large Australian universities in introducing two different types of B2E e-business systems, and reports on the findings about their views on benefits experienced and impediments encountered. The implications of the findings are then discussed. [ABSTRACT FROM AUTHOR]

Background: Price-based policies are effective alcohol harm minimisation policy options. This paper examines public support for price-based policies based on patterns of consumption and expenditure, to determine if the extent to which an individual may be affected by a policy influences their support.Methods: The current study included 1,684 Australian residents (59.8% male, Mage 43.8 [SD=16.7]). Respondents who purchased and consumed alcohol in the past six months were asked about their support for potential changes in a series of price-based policies.Results: Increasing price was less likely to be supported than either implementing a minimum price or a tax-increase earmarked to pay for alcohol harms. Increasing price and taxing drinkers were more likely to be supported by older people and women. We found no relationship between income or perceived impact of price increases on purchasing and level of support.Conclusion: Contrary to the idea that public support might be partly influenced by ability to pay for alcohol, support for a minimum unit price was not related to price paid per drink or income, only amount consumed. Thus, heavier drinkers may be inherently unlikely to support price-based policies even when these policies would have little impact on their actual purchasing. [ABSTRACT FROM AUTHOR]