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Modern computing environments face both low-frequency infrastructural changes, such as software and hardware upgrades, and frequent changes, such as uctuations in the network bandwidth and CPU load. However, existing operating systems are not designed to cope with rapidly changing environments. They provide no mechanism to permit the insertion of… (More)
We present a case study of the relationship between spatial genetic structure (SGS) and age structure in Protium spruceanum (Burseraceae), an insect-pollinated, mass-fruiting, and secondary bird-dispersed tree, as determined through variation in allozyme loci. Using ten polymorphic loci, we investigated spatial and temporal patterns of a genetic structure… (More)
Modern, distributed computing systems need to cope continuously with changes. We identify two kinds of changes: low frequency infrastructural changes, such as software upgrade; and frequent c hanges in the execution environment, such a s n e t work bandwidth, memory availability. This paper proposes 2K , a component-based operating system architecture for… (More)
In this paper, we present an overview of our research project with GaiaOS, a middleware operating system that provides a generic computational environment for ubiquitous computing. In addition to an outline of the GaiaOS architecture, we describe how we address some mobility issues in this infrastructure.
In a glasshouse experiment, different tiller categories (main, young primary, and old primary) of two Guinea grass cultivars, Mombaça and Tanzânia, were (14)C-labelled to investigate C translocation between tillers. In both cultivars, young primary tillers retained less radiocarbon (79%) than main (86%) and old primary (87%) labelled tillers, suggesting… (More)