A schema-based P2P network to enable publish-subscribe for multimedia content in open hypermedia systems

Open Hypermedia Systems (OHS) aim to provide efficient dissemination, adaptation and integration of hyperlinked multimedia resources. Content available in Peer-to-Peer (P2P) networks could add significant value to OHS provided that challenges for efficient discovery and prompt delivery of rich and up-to-date content are successfully addressed. This paper proposes an architecture that enables the operation of OHS over a P2P overlay network of OHS servers based on semantic annotation of (a) peer OHS servers and of (b) multimedia resources that can be obtained through the link services of the OHS. The architecture provides efficient resource discovery. Semantic query-based subscriptions over this P2P network can enable access to up-to-date content, while caching at certain peers enables prompt delivery of multimedia content. Advanced query resolution techniques are employed to match different parts of subscription queries (subqueries). These subscriptions can be shared among different interested peers, thus increasing the efficiency of multimedia content dissemination

Understanding the hospital sharps injury reporting pathway

INTRODUCTION: Patient-care workers are frequently exposed to sharps injuries, which can involve the risk of serious illness. Underreporting of these injuries can compromise prevention efforts. MATERIALS AND METHODS: We linked survey responses of 1572 non-physician patient-care workers with the Occupational Health Services (OHS) database at two academic hospitals. We determined whether survey respondents who said they had sharps injuries indicated that they had reported them and whether reported injuries were recorded in the OHS database. RESULTS: Respondents said that they reported 62 of 78 sharps injuries occurring over a 12-month period. Only 28 appeared in the OHS data. Safety practices were positively associated with respondents’ saying they reported sharps injuries but not with whether reported injuries appeared in the OHS data. CONCLUSIONS: Administrators should consider creating reporting mechanisms that are simpler and more direct. Administrators and researchers should attempt to understand how incidents might be lost before they are recorded

Bistability of the Nuclear Polarisation created through optical pumping in InGaAs Quantum Dots

We show that optical pumping of electron spins in individual InGaAs quantum dots leads to strong nuclear polarisation that we measure via the Overhauser shift (OHS) in magneto-photoluminescence experiments between 0 and 4T. We find a strongly non-monotonous dependence of the OHS on the applied magnetic field, with a maximum nuclear polarisation of 40% for intermediate magnetic fields. We observe that the OHS is larger for nuclear fields anti-parallel to the external field than in the parallel configuration. A bistability in the dependence of the OHS on the spin polarization of the optically injected electrons is found. All our findings are qualitatively understood with a model based on a simple perturbative approach.Comment: Phys Rev B (in press

Paper versus Practice: Occupational Health and Safety Protections and Realities for Temporary Foreign Agricultural Workers in Ontario

Over 20,000 temporary foreign agricultural workers come to Ontario each year, primarily from Mexico and the Caribbean. Agricultural workers are exposed to a number of occupational health and safety (OHS) risks. This article discusses the various OHS protections available to workers and their limitations, and analyzes the specific challenges that temporary foreign workers face in accessing rights, such as language and cultural barriers, information gaps, and precarious employment and immigration status. It also analyzes the limitations with respect to OHS training and the provision and use of personal protective equipment, arguing that these protections are under-regulated and inconsistent. The article concludes with recommendations to improve shortcomings, including standardized and specific OHS training, random OHS inspections, and full inclusion of agricultural workers in provincial legislations. Findings are based primarily on interviews with 100 migrant farmworkers who reported injuries or illness, as well as with key stakeholders such as employers and government officials

Building a safety culture: the importance of "shared mental models" in the Australian construction industry

Managers of construction organizations often speak about the inmportance of OHS. Some organizations move beyond the rhetoric to implement OHS management systems, supported by programmes of OHS training and audits. Yet in the face of deadlines or budgetary pressures, managers at all levels of construction organizations sometimes change their priorities to pursue performance in the traditional areas of cost, time and quality - at the expense of OHS. It would be rare for a manager to openly diminish the importance of understanding about how important OHS 'really is'. This paper discusses research currently underway in the Australian construction industry into the role played by managers at different levels in creating OHS sub-cultures in construction organizations. The paper explores how the existence of these sub-cultures should be identified and managed to create shared mental models of OHS within participating organizations