Results 241 to 250 of about 252,925 (275)

Maximum minimum eigenvalues based spectrum scanner for cognitive radios

2012 IEEE International Instrumentation and Measurement Technology Conference Proceedings, 2012
In this paper we introduce a technique for spectrum scanning with the maximum minimum eigenvalue detection based spectrum sensing. The fundamental problem we address in this paper is the inability of using maximum minimum eigenvalue detection with filtering in time domain where the white noise becomes coloured.
Mohamed Hamid, Niclas Bjorsell
openaire   +1 more source

Minimum Properties of Eigenvalues — Elementary Proofs

1980
The purpose of this paper is to use an elementary integral inequality and some simple linear algebra to give a completely elementary proof of the minimum properties of all eigenvalues of Sturm-Liouville problems. The results are a simplification of work published in [1], where singular cases were considered but general boundary conditions were not.
openaire   +1 more source

MINIMUM WEIGHT MEMBERS FOR GIVEN LOWER BOUNDS ON EIGENVALUES

Engineering Optimization, 1981
The problem is solved of minimizing the mass of an elastic bar whose Euler buckling load and fundamental frequency of transverse vibrations are larger than certain prescribed values. The bar has a solid cross section and is to perform natural vibrations or act as a column at different times during its design life.
B. L KARIHALOO, R. D. PARBERY
openaire   +1 more source

Improving Minimum-Variance Portfolios by Alleviating Overdispersion of Eigenvalues

Journal of Financial and Quantitative Analysis, 2019
In portfolio risk minimization, the inverse covariance matrix of returns is often unknown and has to be estimated in practice. Yet the eigenvalues of the sample covariance matrix are often overdispersed, leading to severe estimation errors in the inverse covariance matrix.
Fangquan Shi, Lianjie Shu, Aijun Yang, Fangyi He   +3 more
openaire   +1 more source

Improved Global Minimum Variance Portfolio via Tail Eigenvalues Amplification

SSRN Electronic Journal, 2017
We identify a few sample eigenvalues adjustment patterns that lead to an improvement in the out-of-sample portfolio Sharpe ratio when the population covariance matrix admits a high-dimensional factor model. These patterns unveil the key to portfolio performance improvement and shed light on the effectiveness of a few well-known covariance matrix ...
Danqiao Guo, Chengguo Weng, Tony S. Wirjanto   +2 more
openaire   +1 more source

Minimum norm output feedback design under specified eigenvalue areas

Systems & Control Letters, 1983
Abstract Starting from a new parametric expression for the state feedback controller of a linear, time-invariant system a procedure is derived which reduces the design of output feedback controllers to an unconstrained optimization problem where all free parameters, both the closed-loop eigenvalues and the invariant parameter vectors, are used for ...
openaire   +1 more source

Principal-Minimum Eigenvalue Algorithm for Signal Sensing

2023 IEEE 23rd International Conference on Communication Technology (ICCT), 2023
Yumin Zhong, Yanhua Li
openaire   +1 more source

On the minimum eigenvalue of the fan product

Second International Conference on Statistics, Applied Mathematics, and Computing Science (CSAMCS 2022), 2023
Qin Zhong, Ling Li
openaire   +1 more source

Minimum number of district eigenvalues

2022
openaire   +1 more source

The eigenvalue problem for a double minimum potential

The Journal of Chemical Physics, 1975
Frank L. Tobin, Juergen Hinze
openaire   +1 more source