Conditioning and preconditioning of the optimal state estimation problem

Optimal state estimation is a method that requires minimising a weighted, nonlinear, least-squares objective function in order to obtain the best estimate of the current state of a dynamical system. Often the minimisation is non-trivial due to the large scale of the problem, the relative sparsity of the observations and the nonlinearity of the objective function. To simplify the problem the solution is often found via a sequence of linearised objective functions. The condition number of the Hessian of the linearised problem is an important indicator of the convergence rate of the minimisation and the expected accuracy of the solution. In the standard formulation the convergence is slow, indicating an ill-conditioned objective function. A transformation to different variables is often used to ameliorate the conditioning of the Hessian by changing, or preconditioning, the Hessian. There is only sparse information in the literature for describing the causes of ill-conditioning of the optimal state estimation problem and explaining the effect of preconditioning on the condition number. This paper derives descriptive theoretical bounds on the condition number of both the unpreconditioned and preconditioned system in order to better understand the conditioning of the problem. We use these bounds to explain why the standard objective function is often ill-conditioned and why a standard preconditioning reduces the condition number. We also use the bounds on the preconditioned Hessian to understand the main factors that affect the conditioning of the system. We illustrate the results with simple numerical experiments.

Comparing finite state machine test coverage criteria

To plan testing activities, testers face the challenge of determining a strategy, including a test coverage criterion that offers an acceptable compromise between the available resources and test goals. Known theoretical properties of coverage criteria do not always help and, thus, empirical data are needed. The results of an experimental evaluation of several coverage criteria for finite state machines (FSMs) are presented, namely, state and transition coverage; initialisation fault and transition fault coverage. The first two criteria focus on FSM structure, whereas the other two on potential faults in FSM implementations. The authors elaborate a comparison approach that includes random generation of FSM, construction of an adequate test suite and test minimisation for each criterion to ensure that tests are obtained in a uniform way. The last step uses an improved greedy algorithm.

The role of human resource management (HRM) in Australian-Malaysian joint ventures

This article examines human resource management (HRM) for successful Australian-Malaysian joint ventures (JVs), on the basis of survey data and case studies. The findings suggest that each phase of JV development had its own pattern of HR practices. Three phases of development were distinguished - initiation, transitional, and maturational. The first phase involved selecting, recruiting and training a skilled workforce and formulating rudimentary human resource policies. Cultural differences were most marked in this phase. The second phase, after three years of operation, involved evolution of human resource policies better suited to local conditions, and more polycentric management staffing. The final phase, after six years of operation, saw the development of a distinctive human resources system, and the minimisation of cultural differences as an operational issue. In this phase there was also a move to more geocentric management staffing.

A preliminary study on building demolition engineering and management

In recent years, building demolition has been challenging urban developers due to the increased incidence of demolition projects and the elevation of demolition requirements. The importance of building demolition is also recognised by researchers and, given its environmental impacts, it is anticipated to achieve the same attention as conventional planning, design,
construction and maintenance in the near future. In this article, the authors aim to develop a series of strategies for promoting building demolition practice. Environmentally-friendly demolition procedures are introduced through a waste minimisation decision that makes the approach on alternatives to demolition and an integrated demolition planning and design approach focus on a just-in-time (JIT) philosophy. A conceptual management framework is also presented for the implementation of demolition projects.

Rural parents, teenagers and alcohol: what are parents thinking?

INTRODUCTION: The fundamental role of alcohol in the lives of young Australians is mirrored in the level of drinking by adolescents. In 2001, more than one in four Australian adolescents aged 14-19 years consumed alcohol weekly. Teenagers in rural areas are more likely to consume alcohol than their metropolitan counterparts. Parents are key 'gatekeepers' of adolescent behaviour and as such are a salient group to consider in relation to adolescent alcohol use. The aim of this study was to explore parents' attitudes, beliefs, concerns and receptiveness to harm minimisation strategies with respect to teenage use of alcohol.

METHODS: A convenience sample of parents with adolescent children attended a series of focus groups across the north and north-western area of the State of Victoria, Australia. Schools were approached to advertise the project and invite parents to participate. Snowball sampling was used to enhance recruitment.

RESULTS: Parents described patterns of alcohol use such as 'drinking to get drunk' and the influence of both parents and peers on the consumption of alcohol by adolescents. Few parents were concerned about the long-term risks of alcohol use by teenagers; rather they were more concerned about the short-term harms, for example, road trauma and other accidents and risky behaviours such as binge drinking. Parents indicated that they perceived alcohol to be less harmful than other drugs and many indicated that alcohol was often not perceived to be a drug. A number of strategies were adopted by parents to negotiate teenagers' drinking and to minimise the risks associated with alcohol use. These included transporting teenagers to parties, providing teenagers with a mobile phone, setting clear guidelines about alcohol use and/or providing teenagers with a small amount of alcohol. These were seen by parents as strategies for reducing the risks associated with alcohol consumption. Many parents reported that they do not feel well informed about alcohol use and how and when to use harm reduction strategies.

CONCLUSIONS: Rural parents are unsure how to respond to teenagers' alcohol use and drunkenness. While some parental strategies for harm reduction (such as supplying adolescents with a small amount of alcohol) may have good face validity in reducing alcohol consumption among adolescents, these strategies are not supported by previous research findings.

Embodied energy analysis of the refurbishment of a small detached building

Energy efficient design principles and the minimisation of operational energy requirements have been demonstrated in the refurbishment of a small existing residential building. Significant thought has been given to these areas, together with an emphasis on the minimisation of resource consumption and material wastage. However, less consideration has been given to the embodied energy of the additional materials, components and systems required to meet these aims. The additional embodied energy may reduce the advantages of minimising the operational energy consumption by extending the energy payback period beyond the life of the building. In general, the embodied energy of buildings and their products has been found to be significant, when national average input-output data is used to fill gaps in traditional life-cycle assessment inventories. Through the use of an input-outputbased hybrid embodied energy analysis, the embodied energy of this refurbished building has increased by 63% compared to the existing building, showing the impact that filling the gaps in traditional inventories can have on energy payback periods.

Technical development for deconstruction management

The Australian construction industry, particularly in the area of demolishing existing facilities, is responsible for up to 40% of the country's enormous solid waste streams, totalling about 14 million tonnes annually. The recently created concept of deconstruction, rather than destruction for demolishing a constructed facility, came about because of the rapidly increasing number of demolished buildings and changes in levels of environmental awareness. However,  reconstruction processes are now seen as only an interesting concept for reducing waste through reuse and recycling, but they fail to achieve widespread understanding or acceptance. The challenges faced by deconstruction are significant and diverse. The maturity of deconstruction practice depends on not only on tlle development of deconstruction techniques and management, but also on the enhancement of deconstruction awareness by the owners, designers, and construction teams, as well as the development of environmental regulations. These practical limitations are interrelated and mutually promotional. The technical developments in deconstruction management resulting from this research will have direct effects on various aspects, including the development of design and construction for deconstruction, deconstruction technology, reused material certification, recycl ing technology, and a method by which to calculate environmental benefits so that deconstruction would be promoted from an interesting concept mainly in theory to wide acceptance in practice. 

Concepts, models and analyses of electronic demolition of buildings

The demolition of building structures produces enormous amounts of waste materials. In most current demolition projects, a great number of demolished materials are directly sent to landfill after their primary usage due to the difficulties in finding their next usage immediately. At the same time, because of limited supply of second-hand materials, new and high quality materials are used in construction projects whose design standards can be fitted using the secondary or used materials. However, this is an inefficient method to reduce waste because off the flow nature of the current waste-exchange systems and the demolition procedure. The recent concept using deconstruction rather than destruction for demolishing a constructed facility fails to achieve widespread understanding or acceptance due to various practical limitations. In this paper, for the purpose of envisaging the deconstruction implementations in practice and promoting cascading usages of construction materials, the concept of electronic demolition (e-Demotion, eDemolition) is put forward for the first time. E-demolition is a virtual demolition approach by which the demolition information, progress and outputs are operated before the physical demolition. Furthermore, the authors set up the essential models to implement electronic demolition of buildings from the viewpoints of demolition progress, business, and information. Each model is demonstrated in accord with the conventional demolition practice and subject to the ideal deconstruction implementation. Following the electronic demolition of a real project, the physical demolition can be anticipated with a minimum of construction waste emission.

Freedom and slavery: constructions of ideologies in illicit drugs treatment

Freedom, autonomy, enslavement and coercion have a multitude of meanings which are determined by the writer’s discipline background and intent, even more so in the area of illicit drugs’ policy and treatment. This paper proposes to begin to untangle the multiplicity of meanings which are attached to two contrasting forms of illicit drugs treatment, harm minimisation and abstinence-based treatments. Both treatment regimes lay claim to the high moral ground in this regard - freedom and autonomy are explicit terms used in the rhetoric of both. How this can best be understood and what sociologists can contribute to the debates about illicit drug treatments is the terrain this paper traverses. It does this by laying out the different meanings of the terms in social theory and then by trying to understand the ‘truth’ claims of treatment proponents and using a Foucauldian perspective to critique these claims.

Problem of precision missile guidance: LQR and H‡ control frameworks

Addressed here is the precision missile guidance problem where the successful intercept criterion has been defined in terms of both minimizing the miss distance and controlling the missile body attitude with respect to the target at the terminal point. We show that the H∞ control theory, when suitably modified, provides an effective framework for the precision missile guidance problem. The existence of feedback controllers (guidance laws) is investigated for the case of finite horizon and non-zero initial conditions. Both state feedback and output feedback implementations are explored.

Pharmaceutical ecomonics and politics vs. patient safety : Lumiracoxib in Australia

Lumiracoxib (Prexige©) 200 mg was listed in Australia’s Pharmaceutical Benefits Scheme (PBS) schedules on 01 August 2006. The listing was intended as a cost-minimisation strategy, as lumiracoxib 200 mg was deemed equivalent in therapeutic effect to celecoxib (Celebrex©) 200 mg, and was available at a lower cost. By the time of listing on the PBS, a safety re-evaluation of the recommended daily dose of lumiracoxib was being considered in other national regulatory jurisdictions. Within 3 months of listing, the manufacturer revised the recommended dosage to half that of the PBS-listed dosage. However, the PBS listing was neither revoked nor modified. At the time of listing on the PBS, lumiracoxib was known to be 17 times as biochemically selective in inhibiting the COX-2 isoform as celecoxib, and twice as selective as rofecoxib, already withdrawn for safety reasons. Safety concerns had already been raised about adverse hepatic outcomes on daily doses of lumiracoxib 200 mg. Communication of information about the risk potential of lumiracoxib was inadequate. Economic and political considerations were prioritised over patient safety, and lumiracoxib 200 mg remained available via the PBS until 10 August 2007, when it was withdrawn for safety reasons following cases of hepatic morbidity and mortality.

Gambling and corporate social responsibility (CSR) : re-defining industry and state roles on duty of care, host responsibility and risk management

During the 1990s, states embraced legalised gambling as a means of supplementing state revenue. But gaming machines (EGMs, pokies, VLTs, Slots) have become increasingly controversial in countries such as Australia, Canada and New Zealand, which experienced unprecedented roll-out of gaming machines in casino and community settings; alongside revenue windfalls for both governments and the gambling industry. Governments have recognised that gambling results in a range of social and economic harms and, similar to tobacco and alcohol, have introduced public policies predicated on harm minimisation. Yet despite these, gaming losses have continued to climb in most jurisdictions, along with concerns about gambling-related harms. The first part of this article discusses an emerging debate in Ontario Canada, that draws parallels between host responsibility in alcohol and gambling venues. In Canada, where government owns and operates the gaming industry, this debate prompts important questions on the role of the state, duty of care and regulation ‘in the public interest’ and on CSR, host responsibility and consumer protection. This prompts the question: Do governments owe a duty of care to gamblers?

The article then discusses three domains of accumulating research evidence to inform questions raised in the Ontario debate: evidence that visible behavioural indicators can be used with high confidence to identify problem gamblers on-site in venues as they gamble; new systems using player tracking and loyalty data that can provide management with high precision identification of problem gamblers and associated risk (for protective interventions); and research on technological design features of new generation gaming products in interaction with players, that shows how EGM machines can be the site for monitoring/protecting players. We then canvass some leading international jurisdictions on gambling policy CSR and consumer protection.

In light of this new research, we ask whether the risk of legal liability poses a tipping point for more interventionist public policy responses by both the state and industry. This includes a proactive role for the state in re-regulating the gambling industry/products; instituting new forms of gaming machine product control/protection; and reinforcing corporate social responsibility (CSR) and host responsibility obligations on gambling providers – beyond self-regulatory codes. We argue the ground is shifting, there is new evidence to inform public policy and government regulation and there are new pressures on gambling providers and regulators to avail themselves of the new technology – or risk litigation

Interjurisdictional allocation of multinational banking income : aligning taxation principles with economic activity

This thesis argues that one type of multinational entity – the multinational bank – poses particularly significant challenges to the international tax regime in terms of its current profit allocation rules. Multinational banks are a unique subset of multinational entities, and as a consequence of their unique traits, the traditional international tax regime foes not yield an optimal interjurisdictional allocation of taxing rights. The opportunity for tax minimisation, achievable because of the unique traits, and realised through exploitation of the traditional source and transfer pricing regime, results in a jurisdictional distribution of taxing rights which does not reflect economic reality. There are two distinct ways in which the traditional international tax regime fails to reflect economic activity. The first way that economic activity may not be reflected in the distribution of the taxing rights to income from multinational banking is through the application of traditional source rules. The traditional sources rules allocate income where transactions are completed rather than where the intermediation services are arranged. As a result of their unique commercial role as financial intermediaries, by separating intermediary economic activity from legal transactions with third parties, multinational banks may distort the true location of the activity giving rise to income. The second way in which the traditional tax regime may fail to reflect economic activity is through the traditional transfer pricing regime requiring related or internal transaction to be undertaken at an arm’s length price. The arm’s length pricing requirement is theoretically deficient in its failure to recognise the highly integrated nature of multinational banking. In practice, the arm’s length pricing requirement is also difficult, if not impossible, to apply to multinational banks because of the requirement of comparability. The difficulties associated with the current model have resulted in a subtle move by multinational banks towards global formulary apportionment. This thesis concludes that, for the international taxation of multinational banks, the current source regime should be replaced with a system that allocates profits for tax purposes on the basis of income source, with source determined using a unitary taxation or global formulary apportionment system. It is argued that global formulary apportionment is a theoretically superior model that provides both jurisdiction to tax and allocated profits on the basis of the economic activity that generates the income.

The legal response to problem gambling in Victoria

The thesis analyses judgments from the higher criminal courts in Victoria involving problem gamblers charged with serious crimes, investigates actions brought by gamblers against gaming establishments in the civil courts and examines the legislation governing gambling in Victoria and the effectiveness of recently introduced harm minimisation measures.

It blasted me into space : intoxication and an ethics of pleasure

O'Malley and Valverde point out that in the 21st century, pleasure is a warrantable motive for drug and alcohol use only when it is attached to the idea of moderation. This presents a problem for those researchers who wish to theorise about those individuals who use drugs deliberately to induce intoxication. This paper uses unconventional means to come to an understanding of intoxication, it uses the stories of interviewed former heroin addicts, published autobiographies, biographies and even some fictional accounts to come to an understanding of the. difficulties of dealing with intoxication and the drug-using subject, it also uses the accounts that Michel Foucault gave about his own use of drugs and its relationship to an ethics of pleasure and resistance. The article uses theories of risk and edgework to understand the underlying meanings of intoxication to many drug users.