simple, light-weight algorithm that assigns synthetic coordinates to hosts such that the distance between the coordinates of two hosts accurately predicts the communication latency between the hosts.

. To address this problem, we propose a novel, synthetic coordinates-based approach. We evaluate our method against alternative strategies for finding router-level disjoint alternative paths. Additionally, we empirically evaluate the distribution of path diversity in the Internet.

physical network. In order to characterize Gnutella’s performance, we modified an existing Gnutella simulation framework developed for the ns-2 network simulator to gather information about query and query hit propagation. We then modified the simulated protocol to use the Vivaldi synthetic coordinate

physical network. In order to characterize Gnutella’s performance, we modified an existing Gnutella simulation framework developed for the ns-2 network simulator to gather information about query and query hit propagation. We then modified the simulated protocol to use the Vivaldi synthetic coordinate

Abstract—The effectiveness of synthetic coordinate systems against DoS and spam stems from the fact that, while changing or hiding a logical address is easier, changing the location of the spammer inside the network should be harder. But synthetic coordinate systems are limited by the fact

but the memory requirements and complexity of existing interior point methods are prohibitive for problems with more than tens of nodes. We present two new algorithms for solving problems with at least a thousand nodes in the Gaussian case. Our first algorithm uses block coordinate descent, and can

Vivaldi is a distributed algorithm that assigns synthetic coordinates to Internet hosts, so that the Euclidean distance between two hosts' coordinates predicts the network latency between them. Each node in Vivaldi computes its coordinates by simulating its position in a network of physical

, epipolar configuration (fundamental matrix), projective reconstruction and self-calibration are the main topics, stressing self-calibration. We discovered that the method for self-calibration we have implemented (see [5]), is not robust enough for real images. However, we will present results for synthetic

solution viscosities

Agents guided by synthetic pheromones can imitate the stigmergetic dynamics of insects. The resulting software architecture is well suited to problems such as the control of unmanned robotic vehicles. We introduce the approach, describe the mechanisms we have developed, and summarize the technology