We describe a new design for authentication and access control. In this design, principals embody a flexible notion of authentication. They are compound principals that reflect the identities of the programs that have executed, even those of login programs. These identities are based on a naming tree. Our access control lists are patterns that recognize principals. We show how this design suppo...

The past two decades have seen an enormous increase in the development and use of networked and distributed systems, providing increased functionality to the user and more efficient use of resources. To obtain the benefits of such systems parties will cooperate by exchanging messages over the network. The parties may be users, hosts or processes; they are generally referred to as principals in ...

This study aimed to examine school principals' perceptions of the school environment in Hong Kong as a context for the dissemination of food knowledge and inculcation of healthy eating habits. A questionnaire survey was administered in secondary schools in Hong Kong to survey Principals' views of students' food choices, operation of the school tuck shop, and promotion of healthy eating at schoo...

Reputation systems are meta systems that record, aggregate and distribute information about the past behaviour of principals in an application. Typically, these applications are large-scale open distributed systems where principals are virtually anonymous, and (a priori) have no knowledge about the trustworthiness of each other. Reputation systems serve two primary purposes: helping principals ...

Motivated by limitations in today’s host-centric IP network, recent studies have proposed clean-slate network architectures centered around alternate first-class principals, such as content, services, or users. However, much like the host-centric IP design, elevating one principal type above others hinders communication between other principals and inhibits the network’s capability to evolve. T...

This study aims to gain insight in the relationship between principals' leadership styles and the configuration of different HR practices for new teachers in primary education. Besides the longstanding interest in educational leadership as a key element in teacher and student performance, there is a growing interest in strategic human resource management (SHRM) in the educational sector. Howeve...

BACKGROUND The number of women working in general practice internationally has been steadily rising. In Scotland there have been concerns that such a change may lead to increased part-time working and subsequently to a fall in available general practice manpower despite an apparently rising overall number of general practitioners. However, there is very little information on the actual hours wo...

INTRODUCTION Policy is a key aspect of school-based efforts to prevent skin cancer. We explored the extent and accuracy of knowledge among principals and teachers in California public school districts about the elements specified in their district's written sun safety policy. METHODS The sample consisted of California public school districts that subscribed to the California School Boards Ass...

Web services have been gathering an increasing amount of attention lately. The raison d’etre of Web services is that we compose them to create new services. For Web services to be effectively composed, however, requires that they be trustworthy and in fact be trusted by their users and other collaborating services. In our conceptual scheme, principals interact as autonomous peers to provide ser...

BACKGROUND Many countries are experiencing recruitment and retention problems in general practice, particularly in rural areas. In the United Kingdom (UK), recent contractual changes aim to address general practitioner (GP) recruitment and retention difficulties. However, the evidence base for their impact is limited, and preference differences between principals and sessional GPs (previously c...