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116
various modes of operation. A DCT-based method is specified for «lossy»
compression, and a predictive method, for «lossless» compression, JPEG features a
simple lossy technique known as the Baseline method, a subset of the other DCT-
based modes of operation. The Baseline method has been by far the most widely
implemented JPEG method to date, and is sufficient in its own right for a large
number of applications. This article provides an overview of the JPEG standard, and
focuses in detail on the Baseline method.
Note: DCT – Discrete Cosine Transform
Abstract 6
Simulating how the global Internet behaves is an immensely challenging
undertaking because of the network’s great heterogeneity and rapid change/ The
heterogeneity ranges from the individual links that carry the network’s traffic, to the
protocols that interoperate over the links, to the «mix» of different applications used
at site, to the levels of congestion seen on different links. We discuss two key
strategies for developing meaningful in the face of these difficulties: searching for
invariants, and judiciously exploring the simulation parameter space. We finish with
a brief look at a collaborative effort within the research community to develop a
common network simulator.
