Now showing items 21-30 of 31
Experience with adaptive mobile applications in Odyssey
(Kluwer Academic Publishers; Springer Science+Business Media, 1999-12)
In this paper, we present our experience with application-aware adaptation in the context of Odyssey, a platform for mobile data access. We describe three applications that we have modified to run on Odyssey – a video ...
Ultrafast ytterbium-doped bulk lasers and laser amplifiers
(Springer-Verlag, 1999-07)
We review recent achievements with ultrafast bulk lasers and amplifiers based on Yb:YAG and Yb:glass. Special attention is paid to those aspects of the quasi-three-level nature of these gain media that are important for ...
Ordered subsets algorithms for transmission tomography
(IOP Publishing Ltd, 1999-11-01)
The ordered subsets EM (OSEM) algorithm has enjoyed considerable interest for emission image reconstruction due to its acceleration of the original EM algorithm and ease of programming. The transmission EM reconstruction ...
Secure Distributed Virtual Conferencing: Multicast or Bust
(Center for Information Technology Integration, 1999-01-25)
We describe a secure distributed virtual conferencing application (SDVC) that provides high quality streaming video and audio using IP multicast for efficient distribution, using strong authentication via cryptographic ...
Antigone: A Flexible Framework for Secure Group Communication
(Center for Information Technology Integration, 1999-09-08)
Many emerging applications on the Internet requiring group communication have varying security requirements. Significant strides have been made in achieving strong semantics and security guarantees within group environments. ...
Penalized-Likelihood Estimators and Noise Analysis for Randoms-Precorrected PET Transmission Scans
(IEEE, 1999-08)
This paper analyzes and compares image reconstruction methods based on practical approximations to the exact log likelihood of randoms precorrected positron emission tomography (PET) measurements. The methods apply to both ...
Polarimetric Radar Observations of Forest State for Determination of Ecosystem Process
(University of Michigan. Radiation Laboratory, 1999-05)
Mean and Variance of Photon Counting with Deadtime
(IEEE, 1999-10-24)
The statistics of photon counting by systems affected by deadtime are potentially important for statistical image reconstruction methods. We present a new way of analyzing the moments of the counting process for a counter ...
On the optimality of the Gittins index rule for multi-armed bandits with multiple plays
(Springer-Verlag Berlin Heidelberg, 1999-12)
We investigate the general multi-armed bandit problem with multiple servers. We determine a condition on the reward processes sufficient to guarantee the optimality of the strategy that operates at each instant of time the ...
Conjugate-Gradient Preconditioning Methods for Shift-Variant PET Image Reconstruction
(IEEE, 1999-05)
Gradient-based iterative methods often converge slowly for tomographic image reconstruction and image restoration problems, but can be accelerated by suitable preconditioners. Diagonal preconditioners offer some improvement ...