Scott A. Vander Wiel

Learn More
The standard software development process consists of multiple stages: requirements, design, coding, system test, first office, and finally delivery. An objective of this process is to minimize the number of faults in delivered code. Root cause analysis shows that many of the faults can be traced back to requirements or design faults. As part of the(More)
— Fast spreading worms are a reality, as amply demonstrated by worms such as Slammer, which reached its peak propagation in a matter of minutes. With these kinds of fast spreading worms, the traditional approach of signature-based detection is no longer sufficient. Specifically, these worms can infect all vulnerable hosts well before a signature is(More)
The self-similarity of network traffic has been convincingly established based on detailed packet traces. This fundamental result promises the possibility of solving on-line and off-line traffic engineering problems using easily-collectible coarse timescale data, such as SNMP measurements. This paper proposes a statistical model that supports predicting(More)
A new method for quasi-Newton minimization outperforms BFGS by combining least-change updates of the Hessian with step sizes estimated from a Wishart model of uncertainty. The Hessian update is in the Broyden family but uses a negative parameter, outside the convex range, that is usually regarded as the safe zone for Broyden updates. Although full Newton(More)
This EM review article focuses on parameter expansion, a simple technique introduced in the PX-EM algorithm to make EM converge faster while maintaining its simplicity and stability. The primary objective concerns the connection between parameter expansion and efficient inference. It reviews the statistical interpretation of the PX-EM algorithm, in terms of(More)
  • 1