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Spectral K-way ratio-cut partitioning and clustering
IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems, 1993Recent research on partitioning has focussed on the ratio-cut cost metric which maintains a balance between the sizes of the edges cut and the sizes of the partitions without fixing the size of the partitions a priori. Iterative approaches and spectral approaches to two-way ratio-cut partitioning have yielded higher quality partitioning results.
Pak K. Chan +2 more
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Normalized Laplacian Spectral Ratio of Graphs
Parallel Processing LettersThe normalized Laplacian spectrum of a graph is the eigenvalues of the associated normalized Laplacian matrix. The quotient between the largest and the second smallest normalized Laplacian matrix eigenvalues of a connected graph, is called the normalized Laplacian spectral ratio.
Min Cai, JiaJia Wang, Shumin Zhang
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Deriving light interception and biomass from spectral reflectance ratio
Remote Sensing of Environment, 1993Abstract Light interception and reflection in different cultivars of spring barley (Hordeum vulgare) were measured in a field experiment and used to verify a theoretical relation between the fraction of intercepted photosynthetically active radiation (fPAR) and the relative vegetation index (RVI). The RVI was calculated as the ratio between infrared (
Christensen, Svend, Goudriaan, J.
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Multispectral optoacoustic tomography by means of normalized spectral ratio
Optics Letters, 2011Quantification of biomarkers using multispectral optoacoustic tomography can be challenging due to photon fluence variations with depth and spatially heterogeneous tissue optical properties. Herein we introduce a spectral ratio approach that accounts for photon fluence variations.
Thomas Jetzfellner +5 more
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Sequence Design for Spectral Shaping via Minimization of Regularized Spectral Level Ratio
IEEE Transactions on Signal Processing, 2019The topic of sequence design has received considerable attention due to its wide applications in active sensing. One important desired property for the design sequence is the spectral shape. In this paper, the sequence design problem is formulated by minimizing the regularized spectral level ratio subject to a peak-to-average power ratio constraint ...
Linlong Wu, Daniel P. Palomar
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Spectral intensity ratios in proton-induced auroras
Journal of Geophysical Research, 1968The ratios of the intensity of λ3914 N2+, λ4709 N2+, λ5577 O I, and λ6300 O I to the Hβ intensity have been measured in proton-excited auroras. The ranges in measured ratios (described by one standard deviation from the mean) are 10.0 to 17.5, 0.9 to 1.3, 9.0 to 12.5 and 2.5 to 3.3, respectively, and these are in reasonable agreement with theoretical ...
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Scaling of spectral displacement ordinates with damping ratios
Earthquake Engineering & Structural Dynamics, 2005The next generation of seismic design codes, especially those adopting the framework of performance-based design, will include the option of design based on displacements rather than forces. For direct displacement-based design using the substitute structure approach, the spectral ordinates of displacement need to be specified for a wide range of ...
Julian J. Bommer, Rishmila Mendis
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Resolution assessment from spectral signal-to-noise ratios
Proceedings, annual meeting, Electron Microscopy Society of America, 1987Since the resolution-limiting factor in electron microscopy of biological macromolecules is not instrumental, but is rather the preservation of structure, operational definitions of resolution have to be based on the mutual consistency of a set of like images.
M. Unser, B.L. Trus, A.C. Steven
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Confidence intervals for spectral mean and ratio statistics
Biometrika, 2009Summary We propose a new method to construct confldence intervals for spectral mean and related ratio statistics of a stationary process, that avoids direct estimation of their asymptotic variances. By introducing a bandwidth, a self-normalization procedure is adopted and the distribution of the new statistic is asymptotically nuisance-parameter free ...
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