Sound, Complete, Linear-Space, Best-First Diagnosis Search

Various model-based diagnosis scenarios require the computation of the most preferred fault explanations. Existing algorithms that are sound (i.e., output only actual fault explanations) and complete (i.e., can return all explanations), however, require exponential space to achieve this task. As a remedy, to enable successful diagnosis on memory-restricted devices and for memory-intensive problem cases, we propose RBF-HS, a diagnostic search method based on Korf's well-known RBFS algorithm. RBF-HS can enumerate an arbitrary fixed number of fault explanations in best-first order within linear space bounds, without sacrificing the desirable soundness or completeness properties. Evaluations using real-world diagnosis cases show that RBF-HS, when used to compute minimum-cardinality fault explanations, in most cases saves substantial space (up to 98 %) while requiring only reasonably more or even less time than Reiter's HS-Tree, a commonly used and as generally applicable sound, complete and best-first diagnosis search

Family caregiver challenges in dementia care in a country with undeveloped dementia services

Author version made available in accordance with Publisher's copyright policy. This is the accepted version of the following article: Wang J., Xiao L.D., He G.-P. & De Bellis A. (2014) Family caregiver challenges in dementia care in a country with undeveloped dementia services. Journal of Advanced Nursing 70(6), 1369–1380. , which has been published in final form at [doi: 10.1111/jan.12299]. In addition, authors may also transmit, print and share copies with colleagues, provided that there is no systematic distribution of the submitted version, e.g. posting on a listserve, network or automated delivery.Aims To examine socially, culturally and politically constructed factors affecting family caregiver practice in dementia care, and to identify possible changes in a country with undeveloped dementia services. Background In China and many other low- and middle-income countries, social transformations are weakening the family care model, which has an impact on the population with dementia. Exploring the challenges that caregivers face may help the international healthcare community to improve dementia services. Design A double hermeneutic approach informed by Giddens' Structuration Theory was used. Methods In-depth semi-structured interviews with 23 family caregivers of people with dementia were conducted in 2012. The interviews were audiotaped, transcribed and analysed. Findings Analyses revealed three consequences of socially constructed factors in dementia care, which constrained caregiver practice. First, caregivers were unable to manage behavioural and psychological symptoms of dementia. Untreated aggressive behaviours caused harm to the person with dementia and endangered the caregiver and the public. Second, the burden on the primary caregiver was evident and caregivers received limited support. Third, there was little coordination between primary and specialist care services for people with dementia. On critical reflection of potential changes that could improve dementia services, caregivers suggested that community nurses have a leading role in coordinating dementia services and supporting caregivers. Conclusion Relying on family caregivers to care for people with dementia without the prevision of dementia services by the public healthcare system generates negative health outcomes for both care recipients and caregivers. The nursing workforce should be developed to support dementia services

Creating, Capturing and Protecting Value A Property Rights-based View of CompetitiveStrategy

This paper develops a property rights-based view of strategy (the “PRV”). A property right (or economic right) is an individual’s net valuation, in expected terms, of the ability to directly consume the services of an asset (including, e.g., a monopoly position) or consume it indirectly through exchange. Resources expended on exchanging, protecting and capturing such rights are transaction costs; thus, we directly link property rights, transaction costs, and economic value. We assume that all relevant exchange is costly and that all agents maximize their property rights. This implies that economizing with transaction costs may be a distinct source of value, and potentially of sustained competitive advantage. Moreover, strategizing may be understood as revolving around influencing impediments (i.e., transaction costs) to value creation. Expectations and contracting also become crucial parts of processes of creating, protecting and capturing value. We use these insights to derive a number of refutable propositions, and argue that key insights from both industrial organization economics and the resource-based view are consistent with the PRV.Property rights, transaction costs, industrial organization

Exploring how males who encounter phenomena they identify as ‘Conversion Disorder’/’Functional Neurological Disorder’ experience agency in their lives

This research investigates the way that males who identify with the diagnostic label ‘conversion disorder/functional neurological disorder (CD/FND)’ experience agency in their lives. The historical developments, controversies and complexities around ‘CD/FND’ form the backdrop of this exploration into the lived experience of agency. A sample of eight participants were recruited via social networking sites and charities, and the data was collected through Skype-based interviews and analysed using the qualitative Interpretative Phenomenological Analysis (IPA) approach. The analysis showed the following five main themes: ‘paradox of control’, ‘living within a dualistic framework’, ‘disconnection from self and others’, ‘engaged in a battle or fight’ and ‘meaning and reality as dependent on other people’. These master themes and their related subordinate themes are presented in light of existing research. The findings highlight the difficulty experienced by participants who identify with a diagnostic label that is at odds with a medicalised approach to understanding and treating illness. The limitations of this study and the potential avenues for future research are also discussed

Set-theoretic duality: A fundamental feature of combinatorial optimisation

The duality between conflicts and diagnoses in the field of diagnosis, or between plans and landmarks in the field of planning, or between unsatisfiable cores and minimal co-satisfiable sets in SAT or CSP solving, has been known for many years. Recent wo

Graph Structural Residuals: A Learning Approach to Diagnosis

Traditional model-based diagnosis relies on constructing explicit system models, a process that can be laborious and expertise-demanding. In this paper, we propose a novel framework that combines concepts of model-based diagnosis with deep graph structure learning. This data-driven approach leverages data to learn the system's underlying structure and provide dynamic observations, represented by two distinct graph adjacency matrices. Our work facilitates a seamless integration of graph structure learning with model-based diagnosis by making three main contributions: (i) redefining the constructs of system representation, observations, and faults (ii) introducing two distinct versions of a self-supervised graph structure learning model architecture and (iii) demonstrating the potential of our data-driven diagnostic method through experiments on a system of coupled oscillators

Evaluating board effectiveness: A review and framework for evaluation of corporate boards

Board evaluations have emerged as an important tool in public policy and corporate practice for enhancing board effectiveness. This paper reviews the extensive literature on effectiveness and the emerging literature on evaluation to understand how the divide between two purposes of evaluation – improving board performance and creating accountability – interact with the two main methods of evaluation – internal and externally facilitated. It also integrates the literature of effectiveness and evaluation into an analytic framework for board evaluation. We believe this tool will contribute theoretical understanding of boards and their work, provide insights for the practice of boards and evaluators, and help policy formation by pointing out the limitations as well as benefits of various policy option