This paper shows how to run multithreaded programs on a DRAM (Distributed Random Access Memory) parallel computer and demonstrates that such programs can run efficiently on a collection of machines distributed across thousands of miles over the internet. Suppose we have a fully strict multithreaded program has work and critical-path length , and we have a processor DRAM machine with an upper bo...

In distributed applications, a group of multiple processes cooperate by exchanging multimedia messages. It is critical to support the group of application processes with enough quality of service (QoS) in addition to the ordered delivery of messages. The delay time and the message loss ratio are signi cant QoS parameters. In the Internet application, the delay time and the loss ratio are signi ...

A wide-area service discovery infrastructure provides a repository in which services over a wide area can register themselves and clients everywhere can inquire about them. In this paper, we discuss how to build such an infrastructure based on the peer-to-peer model. The proposed system, called Neuron, can be executed on top of a set of federated nodes across the global network and aggregate th...

Measurement and analysis of current behavior are valuable techniques for the study of computer networks. In addition to providing insight into the operation and usage patterns of present networks, the results can be used to create realistic models of existing traffic sources. Such models are a key component of the analytic and simulation studies often undertaken in the design of future networks...

It is a significant problem to provide a robust and portable software environment that can link together clusters of workstations and other heterogeneous computers. There are particular difficulties when the computer clusters to be managed transcend administrative boundaries across wide-area networks. We review some of the technologies that have emerged recently for managing arbitrary computer ...

In a wide-area environment, the time required to obtain data from remote sources can vary unpredictably due to network congestion, link failure or other problems. Traditional techniques for query optimization and query execution do not cope well with such unpredictability. The static nature of those techniques prevents them from adapting to remote access delays that arise at runtime. In this pa...

We wanted to use a multiple probes and white light interferometer to measure the surface profile of thin film. However, this system, as assessed with a scanning method, suffers from the presence of a moving stage and systematic sensor errors. In this paper, in order to separate measurement error caused by the moving stage and systematic sensor errors, the least squares analysis is applied to ac...

Background traac models are fundamental to packet-level network simulation since the background traac impacts packet drop rates, queuing delays, end-to-end delay variation, and also determines available network bandwidth. In this paper, we present a statistical characterization of wide-area IP traac based on 90-minute traces taken from a week-long trace of packets exchanged between a large camp...

The rapid proliferation of widely-distributed data and document collections raises the need for wrapper/mediator archi-tectures that can handle the challenges of wide area query processing. Traditional query and search techniques do not scale to large numbers of repositories and cannot cope with the unpredictable performance and (un)availability of access to such repositories. Research at the U...