Seismic full-waveform inversion (FWI) methods hold strong potential to recover multiple subsurface elastic properties for hydrocarbon reservoir characterization. Simultaneously updating physical parameters introduces the problem of interparameter trade-off, arising from simultaneous variations different parameters, which increase nonlinearity and uncertainty multiparameter FWI. The coupling effects are significantly influenced by model parametrization acquisition arrangement. An appropriate...

The problem of inverting for multiple physical parameters in the subsurface using seismic full-waveform inversion (FWI) is complicated by interparameter trade-off arising from inherent ambiguities between different parameters. Parameter resolution often characterized scattering radiation patterns, but these neglect some important aspects trade-off. More general analysis and mitigation isotropic-elastic FWI possible through judiciously chosen multiparameter Hessian matrix-vector products. We...

Diabetic retinopathy (DR), a common complication of diabetes mellitus, is leading cause vision loss, yet its molecular mechanisms remain poorly understood. This review explores key genes implicated in DR—ubiquitin-like modifier activating enzyme 1 (UBA1), programmed cell death 11 (PDCD11), mitochondrial ribosomal protein S12 (MRPS12), S5 (MRPS5), RNA polymerase I subunit C (POLR1C), proto-oncogene tyrosine-protein kinase Src (SRC), glycogen synthase 3 beta (GSK3B), superoxide dismutase 2...

Simultaneous determination of multiple physical parameters using full-waveform inversion (FWI) suffers from interparameter trade-off difficulties. Analyzing the trade-offs in different model parameterizations isotropic-elastic FWI, and thus determining appropriate parameterization, are critical for efficient obtaining reliable inverted models. Five considered compared including velocity-density, modulus-density, impedance-density, two velocity-impedance parameterizations. The scattering...

We report selective-area growth of high-crystalline-quality InGaAs-based photodetectors with optimized InP/GaAs buffers on patterned (100)-oriented silicon-on-insulator (SOI) substrates by metal-organic chemical vapor deposition. The composite GaAs and InP buffer was grown using a two-temperature method. island morphology the low-temperature nucleation layer inside well SOI substrate optimized. A medium temperature inserted prior to typical high-temperature further decrease dislocation...

Wavefield or seismic data are special sets. They cannot fill the 4‐D space‐time in arbitrary ways. The time‐space distributions must observe causality which is dictated by wave equation. Wave solutions can only exist on light cone 4D Fourier space. Physical wavelet a localized solution extending into complex causal tube. In this study we establish link between physical defined Kaiser using AST (analytic signal transform) and dreamlet (drumbeat‐beamlet). We prove that be considered as type of...

DTN (Delay Tolerant Network) is a new type of mobile Ad Hoc network. Due to its characteristics such as long communication delay, high dynamic topology, it difficult maintain the stability end paths. Therefore, design effective and reliable routing algorithms has become key issue in DTN. To avoid random blindfold forwarding Spray Wait routing, algorithm named R-ASW (Relay-probability-based Adaptive Spay Wait) been proposed, uses performance receiver nodes determine whether forward message...

PreviousNext No AccessSEG Technical Program Expanded Abstracts 2013Preliminary study on Dreamlet based compressive sensing data recoveryAuthors: Ru-Shan WuYu GengLingling YeRu-Shan WuSearch for more papers by this author, Yu GengSearch and Lingling YeSearch authorhttps://doi.org/10.1190/segam2013-0800.1 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract We present a recovery scheme in (Drumbeat-Beamlet,...

Local cosine/sine basis is a localized version of with smooth window function. It has orthogonality and good time frequency localization properties together fast algorithm. In this paper, we present new method combining the main idea local bases, multi‐scale decomposition dispersion relation to form multi‐scale, multi‐dimensional self‐similar dreamlet transform. Meanwhile, storage scheme based on proposed by using zig‐zag sequence. We apply SEG‐EAGE salt model synthetic poststack data set...

Abstract Prestack depth migration has been widely used for seismic imaging recently. However, the of sub‐salt structure is still a hard issue even in true velocity model. Here, we use local angle domain target oriented illumination analysis to study how acquisition geometry affects image quality, especially some reflectors with certain dip area. Numerical tests based on 2D SEG/EAGE salt model help us better understand capability prestack under given system. This can also provide an easy and...

Identifying rare germline and somatic variants associated with cancer progression is an important research topic in genomics. Although many approaches are proposed for variant association study, they not fit sequencing data due to multiple issues, such as overly relying on pre-selection, losing sight of interacting hotspots, etc. In this article, we propose improved pipeline identify mutation interactions influencing susceptibility from pair-wise data. The pipeline, RareProb-C performs...

ABSTRACT We present a Gaussian packet migration method based on Gabor frame decomposition and asymptotic propagation of packets. A has both Gaussian‐shaped time–frequency localization space–direction localization. Its evolution can be obtained by ray tracing dynamic tracing. In this paper, we first briefly review the concept After discussing how initial parameters affect shape packet, then propose two Gabor‐frame‐based methods that sparsely accurately represent seismic data. One is...

Full-waveform inversion (FWI) is a highly non-linear inverse problem, normally solved iteratively, with each iteration involving an update constructed through linear operations on the residuals. Incorporating flexible degree of non-linearity within may have important consequences for convergence rates, determination low model wavenumbers and discrimination parameters. We examine one approach doing so, wherein higher order scattering terms are included sensitivity kernel during construction...

A multi-path routing algorithm based on network coding is proposed for combating long propagation delay and high bit error rate of space information networks. On the basis traditional routing, uses a random linear strategy to code data packets. Code number determined by next hop link status current received packets sent upstream node together. The improves retransmission cache mechanisms through using redundancy caused coding. Meanwhile, also adopts flow distribution time balance load....

Using a tensor product of local exponential frame vector as the time‐frequency atom (a drumbeat) and cosine basis function space‐wavenumber beamlet), we construct localized (t‐ω,x‐ξ) drumbeat‐ beamlet). The imaging condition in t ‐ ω domain is introduced propagator matrix derived. compression seismic data using new decomposition tested simple numerical tests on are performed. sparseness both decompositions demonstrated through these examples. method has potential application efficient...

An approach to depth migration, based on an integral representation of seismic data, that is, wavefields recorded the boundary, is presented in terms Poincaré wavelets. Each wavelet taken as a boundary datum for high-frequency asymptotic solution wave equation. This solution, which we call quasiphoton or Gaussian packet, decreases manner away from point running along ray launched surface. The deformation propagating packet into account migration algorithm. A numerical example zero-offset...

Abstract: In this study, HLA‐DRB1 gene was genotyped by using the microarray technique. Oligonucleotide probes were designed based on partial sequences of various genotypes HLA‐DRB1, and fixed a silylated slide to form microarray. The second exon in extracted genomic DNA samples amplified labelled means polymerase chain reaction (PCR); then it hybridized scanned, result analysed order determine tested sample. A total 1574 1592 clinical had accordant results either assay or PCR‐SSP assay; 8...

The objective of this paper is to further investigate the theory and algorithm wave propagation imaging in dreamlet domain for direct application compressed seismic data. In our former work, shows great potential efficient representation Based on combination compression theory, we discuss one‐way terms data processing domain, that allows us process only a few percentage decomposition coefficients whole set get accurate result. By using 5‐layer velocity model as numerical example, show also...

In full waveform inversion (FWI) high-resolution subsurface model parameters are sought.FWI is normally treated as a nonlinear least-squares inverse problem, in which the minimum of corresponding misfit function found by updating parameters.When multiple elastic or acoustic properties solved for, simple gradient methods tend to confuse parameter classes.This referred cross-talk; it leads incorrect solutions, poor convergence and strong dependence on scaling different types.Determining step...