An important problem in wide area augmented reality applications is to localize the user accurately so as to superimpose metadata in the user’s field of view. This task is easier in outdoor environments since GPS is available. Also, for small area AR applications consisting of a scene with a great deal of texture, computer vision techniques can be used to determine a user’s pose. In this paper,...

Experim.eiitation an wide area computer networks such as the Internet is dificult. One dificulty is the lack of experimental hosts for individual researches or research groups. We have developed a new approach to overcome this problem. Our approach i s t o emulate a remote site using one local machine, and to em.ulate a true Internet communication environmed in, a local area network, b y routin...

Designing security of wide-area distributed systems is a highly complicated task. The complexity of underlying distribution and replica-tion infrastructures together with the diversity of application scenarios increases the number of security requirements that must be addressed. High assurance requires the security enforcement to be isolated from non-security relevant functions and limited in t...

personnel and the traveling public. These two groups have long since needed one cohesive place by which to visualize, analyze, and interact with all of these data. Twodimensional “traffic maps” and more sophisticated geographic information system (GIS) databases have become popular means to visualize much of the data; however, typically these systems are capable of only two-dimensional data rep...

This chapter reports on the development of a Wide-Area Measurement System in Mexico entitled SIMEFAS (Sistema de Medición Fasorial). It has been designed to increase the security and integrity of Mexico’s electric power system. Current development of SIMEFAS includes five regional PDCs to which phasor data is sent by PMUs spread over the National Electrical System. Developed applications includ...

Developing large-scale wide-area applications requires an infrastructure that is presently lacking entirely. Currently, applications have to be built on top of raw communication services, such as TCP connections. All additional services, including those for naming, replication, migration, persistence, fault tolerance, and security, have to be implemented for each application anew. Not only is t...

Improvements in processing power and core bandwidth set against fundamental constraints on wide-area latency increasingly emphasise the position in the network at which services are deployed. The XenoServer project is building a platform for distributed computing that facilitates the migration of services between hosts to minimise client latency and balance load in response to changing patterns...

In this paper, the design and implementation of a wireless communication system specific to wide area sensor network capable of establishing ad hoc connections is presented. First, the application to which this system is applied is explained, and then a brief description of the system is made. In this system two routing algorithms were implemented, one based on a static links routing table and ...

As mobile clients travel, their costs to reach home filing services change, with serious performance implications. Current file systems mask these performance problems by reducing the safety of updates, their visibility, or both. This is the result of combining the propagation and notification of updates from clients to servers. Fluid Replication separates these mechanisms. Client updates are s...

A virtual cluster is a promising technology for reducing management costs and improving capacity utilization in datacenters and computer centers. However, recent cluster virtualization systems do not have the maximum scalability and flexibility required, due to limited hardware resources at one site. Therefore, we are now developing an advanced cluster management system for multi-site virtual c...