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The Web services resource framework defines conventions for managing state in distributed systems based on Web services, and WS-notification defines topic-based publish/subscribe mechanisms. We analyze five independent and quite different implementations of these specifications from the perspectives of architecture, functionality, standards compliance,(More)
The Open Grid Service Infrastructure (OGSI) has been designed to facilitate the creation of multiple, interoperable Grid service hosting environments, but to date only one fully OGSI-compliant hosting environment exists, Globus Toolkit version 3 (GT3). This paper describes the design and implementation of OGSI.NET, which is the second, independent hosting(More)
This paper describes a method that passively assesses basic walker-assisted gait characteristics using only force-moment measurements from the walker's handles. The passively derived gait characteristics of 22 subjects were validated against motion capture gait analysis. The force-moment based heel initial contact detection algorithm have produced a high(More)
Grid computing is the use of large collections of heterogeneous, distributed resources (including machines, databases, devices, and users) to support large-scale computations and wide-area data access. The Legion system is an implementation of a software architecture for grid computing. The basic philosophy underlying this architecture is the presentation(More)
The Web Services Resource Framework (WSRF) and its companion WS-Notification were introduced in January 2004 as a new model on which to build grids. This paper contains early observations made while implementing the full suite of WSRF and WS-Notification specifications on the Microsoft .NET Platform. While the potential of WSRF and WS-Notification remains(More)
The Web service resource framework (WSRF) was announced in January 2004 as a new way for manipulating "stateful resources" to perform grid computing tasks using Web services. This paper discusses, to our knowledge, the most complex application built to date utilizing WSRF concepts. We describe a remote job execution system that handles scheduling, data(More)
To date, not enough attention has been paid to issues surrounding the description and enforcement of policies for controlling grid resources. These policies define the permitted or desired usage scenario(s) allowed by resource providers, virtual organizations, or even the governing body for an entire grid. Most existing Grid systems have either "in-spirit"(More)
This paper emphasizes the importance of assessing stability index for steering-controlled three-wheeled walkers. The paper describes a stability computation model that can be used to generate a reference input to the intelligent shared-control algorithm. The model can be used to evaluate the instantaneous stability margin of the walker-user system. This(More)
Grid computing involves networks of heterogeneous resources working in collaboration to solve problems that cannot be addressed by the resources of any one organization. A pervasive problem for grid users is how best to discover the resources they need given dynamic grid environments. UDDI, the universal description, discovery and integration framework, is(More)