Key agreement is a fundamental security functionality by which pairs of nodes agree on shared keys to be used for protecting their pairwise communications. In this work we study key-agreement schemes that are well-suited for the mobile network environment. Specifically, we describe schemes with the following characteristics: • Non-interactive: any two nodes can compute a unique shared secret ke...

Semantic Web is expected to become an enhanced information foundation for both humans and machines. Once data on the WWW is annotated with machine understandable metadata linked to ontology, complex tasks can be automated using software agents. Among the issues surrounding the Semantic Web, difficulties in designing metadata act as a bottleneck to widespread adoption of the Semantic Web. This i...

policy GIS emissions LCI composition analysis EfW data costs environmental impacts CA sites public consultation BVPI political diversion green waste bring strategic MBT operational GIS participation attitudinal surveys composition financial kerbside behaviours hierarchy scenarios resources planning residual minimisation perceptions recovery strategy BPEO composting public waste environmental in...

In this work we describe the possible transitions for the hierarchical structure that describes an image in Gaussian scale space. Until now, this structure has only been used for topological segmentation, while image matching and retrieval studies ignored the hierarchy. In order to perform such tasks based on the hierarchical structure, one needs to know which transitions are allowed when the s...

In this work we describe the possible transitions for the hierarchical structure that describes an image in Gaussian scale space. Until now, this structure has only been used for topological segmentation, while image matching and retrieval studies ignored the hierarchy. In order to perform such tasks based on the hierarchical structure, one needs to know which transitions are allowed when the s...

Distributed applications on networks of workstations are an increasingly common way to satisfy computing needs. However existing mechanisms for distributed programming exhibit poor performance and reliability as application size increases. The ISIS distributed programming system is being extended to support large scale distributed applications by providing hierarchical process gr(,ups. The prin...

An ageing population means that the incidence of people who are visually impaired will increase. However, extending the role of ophthalmic nurses will promote delivery of a more effective health service for these patients. Using Maslow's hierarchy of needs as a basis for addressing the care of patients with visual impairment is a means of ensuring that they receive high quality, appropriate car...

In designing a complex project that uses artificial intelligence often there is an inability to mesh immediate, local needs with larger, global needs. A technique to resolve this is to divide the project into hierarchical groups. With this, the lowest level groups within the hierarchy undertake most of the interactions with the environment, i.e. the immediate local needs. A higher level group l...

The process of evolutionary emergence of purposeful adaptive behavior is investigated by means of computer simulations. The model proposed implies that there is an evolving population of simple agents, which have two natural needs: energy and reproduction. Any need is characterized quantitatively by a corresponding motivation. Motivations determine goaldirected behavior of agents. The model dem...