University of South Australia

About: University of South Australia is a education organization based out in Adelaide, South Australia, Australia. It is known for research contribution in the topics: Population & Context (language use). The organization has 10086 authors who have published 32587 publications receiving 913683 citations. The organization is also known as: The University of South Australia & UniSA.

Private information retrieval for coded storage

Abstract: Private information retrieval scheme for coded data storage is considered in this paper. We focus on the case where the size of each data record is large and hence only the download cost (but not the upload cost for transmitting retrieval queries) is of interest. We prove that the tradeoff between storage cost and retrieval/download cost depends on the number of data records in the system. We propose a class of linear storage codes and retrieval schemes, and derive conditions under which our schemes are error-free and private. Tradeoffs between the storage cost and retrieval costs are also obtained.

Depression in the workplace: An economic cost analysis of depression-related productivity loss attributable to job strain and bullying

Abstract: Depression represents an increasing global health epidemic with profound effects in the workplace. Building a business case via the quantification of potentially avertable costs is essential to convince organizations to address depression at work. Our study objectives were to: (1) demonstrate a process path whereby job strain and bullying are related to productivity loss via their effects on depression; (2) estimate the costs to employers of sickness absence and presenteeism that are associated with depression; (3) investigate the relationship between depression severity and costs; and (4) estimate the contribution of job strain and bullying to depression-related productivity loss. A population-based telephone survey was conducted across two Australian states (N = 2074), with a one-year follow-up (cohort design). Results confirmed job strain and bullying affected productivity via depressive symptoms. Total national annual employer costs for lost productivity due to depression were estimated at $AUD8 billi...