Applying pi-Calculus to Practice: An Example of a Unified Security Mechanism

The Pi-calculus has been developed to reason about behavioural equivalence. Different notions of equivalence are defined in terms of process interactions, as well as the context of processes. There are various extensions of the Pi-calculus, such as the SPI calculus, which has primitives to facilitate security protocol design. Another area of computer security is access control research, which includes problems of access control models, policies and access control mechanism. The design of a unified framework for access control requires that all policies are supported and different access control models are instantiated correctly. In this paper we will utilise the Pi calculus to reason about access control policies and mechanism. An equivalence of different policy implementations, as well as access control mechanism will be shown. Finally some experiences regarding the use of Pi-calculus are presented

Spartan Daily, November 6, 1997

Volume 109, Issue 49https://scholarworks.sjsu.edu/spartandaily/9196/thumbnail.jp

Trinity College Bulletin, 1961-1962 (Catalogue Issue)

https://digitalrepository.trincoll.edu/bulletin/1240/thumbnail.jp

Program and Abstracts of the Annual Meeting of the Georgia Academy of Science, 2013

The annual meeting of the Georgia Academy of Science took place March 29-30, 2013, at Valdosta State University, Valdosta, Georgia. Presentations were provided by members of the Academy who represented the following sections: I. Biological Sciences II Chemistry III. Earth & Atmospheric Sciences IV. Physics, Mathematics, Computer Science, Engineering & Technology V. Biomedical Sciences VI. Philosophy & History of Science VII. Science Education VIII. Anthropology

Are Marine Protected Areas in the Turks and Caicos Islands ecologically or economically valuable?

Marine Protected Areas (MPAs) are often advocated by ecologists as a method of conserving valuable fish stocks while ensuring the integrity of ecological processes in the face of increasing anthropogenic disturbance. In the Turks and Caicos Islands there is little evidence that current MPAs are ecologically beneficial but there are indications that boundary changes may enhance queen conch and finfish production. Implementing boundary changes usually requires political will and, hence, quantifiable economic benefits. Assessing the value of reef fish is particularly important because they are potentially valuable for consumptive and nonconsumptive purposes. We demonstrate the nonconsumptive economic value of increased Nassau grouper size and abundance to the dive tourism industry through a paired comparison conjoint survey of visiting divers. Our results suggest that accounting for the non-consumptive economic value of increased Nassau grouper abundance and size may have a large impact on the economic viability of ecologically functional MPAs

Testing the capability of Rare Earth Elements to identify archaeological strata in an African site: The case of the terraced landscape at Konso, Ethiopia

Over the last twenty years Rare Earth Elements (REE) have started to be part of archaeometric studies. Due to their particular characteristics there have been several attempts to apply REE analysis to different archaeological scenarios including stratigraphically-controlled agricultural soils, demonstrating that this is an effective tool to understand how human activity is reflected in soil development. Our study proposes a new methodological approach for the identification of anthropogenic deposits through REE soil analysis, pushing current limitations of traditional chemical and sedimentology techniques. Our study represents the first application of REE concentrations in soils from tropical Africa within an archaeological context. The agricultural soils were captured in an artificial sediment trap that forms part of the terraced landscape in Konso, Ethiopia; a system thought to have developed over the last 500 years, and which was awarded World Heritage status in 2011. Forty samples were taken from successive alluvial layers down a c. 2m thick soil sequence that had accumulated behind a series of drystone walls. The samples were analyzed for trace elements and REE via ICP-MS. To understand the causes of enrichment or depletion of REE, the data were compared with soil organic matter, organic carbon and fire markers. To aid interpretation we crossreferenced our results with archaeobotanical and soil micromorphology data. Data were analysed using multivariate statistics. Taken together these results present a very different picture of landscape development to previous presented accounts; the REE analyses provide significant details regarding the source and transportation of sediments

URI Undergraduate Course Catalog 1973-1974

This is a digitized, downloadable version of the University of Rhode Island course catalog.https://digitalcommons.uri.edu/course-catalogs/1004/thumbnail.jp

Clemson Catalog, 2007-2008, Volume 82

https://tigerprints.clemson.edu/clemson_catalog/1157/thumbnail.jp

URI Undergraduate Course Catalog 1971-1972

This is a digitized, downloadable version of the University of Rhode Island course catalog.https://digitalcommons.uri.edu/course-catalogs/1000/thumbnail.jp