Falling over the edge

Sparsistency of the Edge Lasso over Graphs

The fused lasso was proposed recently to enable recovery of high-dimensional patterns which are piece-wise constant on a graph, by penalizing the `1-norm of differences of measurements at vertices that share an edge. While there have been some attempts at coming up with efficient algorithms for solving the fused lasso optimization, a theoretical analysis of its performance is mostly lacking exc...

Falling Between the Cracks

The Falling Slinky

Consider a slinky that is held at one end while the rest of it is allowed to hang freely. If the slinky is released, then as it falls due to gravity it also shrinks in extent due to the contracting force in the slinky itself. A few years ago it was discovered that the net effect of these two changes exactly counteract each other at the bottom extent of the slinky and therefore the bottom of the...

Precise Time Synchronization over GPRS and EDGE

Modern communication services are more and more focused towards real time mobile multimedia applications like mobile video and Voice over IP. To assure sufficient Quality of Service control, appropriate measurements are needed. One of the most difficult tasks is to measure the exact value of one way delay, because very precise time synchronization between host and peer is needed. Most multimedi...

Performance Evaluation of TCP/IP over EDGE

Enhanced Data rates for Global Evolution (EDGE) provides an evolutionary path from existing cellular systems such as Global System for Mobile Communications (GSM) for delivering higher bit rate services that facilitate wireless Internet access. Thus, EDGE only de nes a new radio access technology to achieve higher bit rates. This paper investigates the performance of Transmission Control Protoc...