Absfrucf -A universal nearly efficient estimator is proposed for the first order autoregressive (AR) model where the probability distribution of the driving noise is unknown. The proposed estimator has an intuitively appealing relation to universal data compression and to universal tests for randomness. Index Terms -asymptotically efficient estimation, universal estimation, Cramer-Rao bound, Fi...

A new species of the New World genus Lespesia, Lespesia melloi SP NOV: (Diptera: Tachinidae), is described from southeastern Brazil. The species is reported here as a parasitoid of Xanthopastis timais (Cramer, 1782) (Lepidoptera: Noctuidae). The caterpillars of this noctuid feed on leaves and bulbs of amaryllis (Amaryllidaceae) in Brazil.

In this letter we show that the variation of the Cramer-Shoup public-key encryption scheme as introduced in 1] is not secure against an adaptive chosen ciphertext attack. This removes the putative main advantage of the scheme. Introduction: In 1] a new public-key encryption scheme was proposed. It is a (sim

A Cramer-Rao bound (CRB) study is developed in onedimensional (1D) space which sheds fundamental insight onto the information about multiply scattering point-like scatterers that is contained in scattering field data corresponding to transmissive, reflective, and combined transmissive plus reflective sensing geometries, and singleand multi-frequency measurements.

We apply a uniform Cramer-Rao (CR) bound [l] to study the bias-variance trade-offs in parameter estimation. The uniform CR bound is used to specify achievable and unachievable regions in the bias-variance trade-off plane. The applications considered in this paper are: 1) twodimensional single photon emission computed tomography (SPECT) system, and 2) one dimensional edge localization.

The lower bound of Cramer and Rao is generalized to pairs of families of probability distributions, one of which is escort to the other. This bound is optimal for certain families, called φ-exponential in the paper. Their dual structure is explored.

The Cramer-Rao bound is obtained for the joint problem of concurrent association and track parameter estimation for the problem of tracking in clutter and tracking multiple targets. Simplified rule-of-thumb expressions are obtained to quantify the possibility and requirements for tracking in heavy clutter. © 1997 Elsevier Science B.V.

The material in this overview is drawn from selected abstracts that appear in the Center for Nonproliferation Studies’ nuclear and missile databases. Transactions of nuclear and missile technologies, parts, and materials are listed according to the recipient country. Other developments are listed according to the country where the event or development took place. by Michael Barletta, Clay Bowen...

We apply a uniform Cramer-Rao (CR) bound [l] to study the bias-variance trade-offs in single photon emission computed tomography (SPECT) image reconstruction. The uniform CR bound is used to specify achievable and unachievable regions in the bias-variance trade-off plane. The image reconstruction algorithms considered in this paper are: 1) Space alternating generalized EM and 2) penalized weigh...

Recent results of Cascudo, Cramer, and Xing on the construction of arithmetic secret sharing schemes are improved by using some new bounds on the torsion limits of algebraic function fields. Furthermore, new bounds on the torsion limits of certain towers of function fields are given.