9,823 research outputs found
Compressive Channel Estimation and Multi-user Detection in C-RAN
This paper considers the channel estimation (CE) and multi-user detection
(MUD) problems in cloud radio access network (C-RAN). Assuming that active
users are sparse in the network, we solve CE and MUD problems with compressed
sensing (CS) technology to greatly reduce the long identification pilot
overhead. A mixed L{2,1}-regularization functional for extended sparse
group-sparsity recovery is proposed to exploit the inherently sparse property
existing both in user activities and remote radio heads (RRHs) that active
users are attached to. Empirical and theoretical guidelines are provided to
help choosing tuning parameters which have critical effect on the performance
of the penalty functional. To speed up the processing procedure, based on
alternating direction method of multipliers and variable splitting strategy, an
efficient algorithm is formulated which is guaranteed to be convergent.
Numerical results are provided to illustrate the effectiveness of the proposed
functional and efficient algorithm.Comment: 6 pages, 3 figure
Chiral geometry of higher excited bands in triaxial nuclei with particle-hole configuration
The lowest six rotational bands have been studied in the particle-rotor model
with the particle-hole configuration
and different triaxiality parameter . Both constant and spin-dependent
variable moments of inertial (CMI and VMI) are introduced. The energy spectra,
electromagnetic transition probabilities, angular momentum components and
-distribution have been examined. It is shown that, besides the band 1 and
band 2, the predicted band 3 and band 4 in the calculations of both CMI and VMI
for atomic nuclei with could be interpreted as chiral doublet
bands.Comment: 4 pages, 4 figure
Fuzzy interacting multiple model H∞ particle filter algorithm based on current statistical model
In this paper, fuzzy theory and interacting multiple model are introduced into H∞ filter-based particle filter to propose a new fuzzy interacting multiple model H∞ particle filter based on current statistical model. Each model uses H∞ particle filter algorithm for filtering, in which the current statistical model can describe the maneuver of target accurately and H∞ filter can deal with the nonlinear system effectively. Aiming at the problem of large amount of probability calculation in interacting multiple model by using combination calculation method, our approach calculates each model matching probability through the fuzzy theory, which can not only reduce the calculation amount, but also improve the state estimation accuracy to some extent. The simulation results show that the proposed algorithm can be more accurate and robust to track maneuvering target
Reflected Schr\"odinger Bridge for Constrained Generative Modeling
Diffusion models have become the go-to method for large-scale generative
models in real-world applications. These applications often involve data
distributions confined within bounded domains, typically requiring ad-hoc
thresholding techniques for boundary enforcement. Reflected diffusion models
(Lou23) aim to enhance generalizability by generating the data distribution
through a backward process governed by reflected Brownian motion. However,
reflected diffusion models may not easily adapt to diverse domains without the
derivation of proper diffeomorphic mappings and do not guarantee optimal
transport properties. To overcome these limitations, we introduce the Reflected
Schrodinger Bridge algorithm: an entropy-regularized optimal transport approach
tailored for generating data within diverse bounded domains. We derive elegant
reflected forward-backward stochastic differential equations with Neumann and
Robin boundary conditions, extend divergence-based likelihood training to
bounded domains, and explore natural connections to entropic optimal transport
for the study of approximate linear convergence - a valuable insight for
practical training. Our algorithm yields robust generative modeling in diverse
domains, and its scalability is demonstrated in real-world constrained
generative modeling through standard image benchmarks
Faba Bean (Vicia faba L.) Nodulating Rhizobia in Panxi, China, Are Diverse at Species, Plant Growth Promoting Ability, and Symbiosis Related Gene Levels
We isolated 65 rhizobial strains from faba bean (Vicia faba L.) from Panxi, China, studied their plant growth promoting ability with nitrogen free hydroponics, genetic diversity with clustered analysis of combined ARDRA and IGS-RFLP, and phylogeny by sequence analyses of 16S rRNA gene, three housekeeping genes and symbiosis related genes. Eleven strains improved the plant shoot dry mass significantly comparing to that of not inoculated plants. According to the clustered analysis of combined ARDRA and IGS-RFLP the isolates were genetically diverse. Forty-one of 65 isolates represented Rhizobium anhuiense, and the others belonged to R. fabae, Rhizobium vallis, Rhizobium sophorae, Agrobacterium radiobacter, and four species related to Rhizobium and Agrobacterium. The isolates carried four and five genotypes of nifH and nodC, respectively, in six different nifH-nodC combinations. When looking at the species-nifH-nodC combinations it is noteworthy that all but two of the six R. anhuiense isolates were different. Our results suggested that faba bean rhizobia in Panxi are diverse at species, plant growth promoting ability and symbiosis related gene levels.Peer reviewe
Development of a loop-mediated isothermal amplification assay for sensitive and rapid detection of Mycoplasma bovis
A loop-mediated isothermal amplification (LAMP) assay targeting uvrC of Mycoplasma bovis was developed and evaluated. The assay specifically amplified only M. bovis; no cross-reactivity was observed for other Mycoplasma species or respiratory bacterial species. The sensitivity of the assay in pure cultures was 10-fold higher than that of polymerase chain reaction (PCR), with a detection limit of 34 CFU per reaction. The accuracy of the assay was further validated by both restriction analysis and nucleotide sequencing of the amplified product. The assay was applied to 98 specimens collected from cattle with respiratory disease or from healthy individuals and compared with a PCR-based assay. The sensitivity and specificity of the LAMP assay in terms of PCR was 100 and 74%, respectively. In conclusion, we successfully developed a rapid, specific, and sensitive LAMP test for M. bovis detection in a clinical setting.Key words: Loop-mediated isothermal amplification, polymerase chain reaction, uvrC gene, Mycoplasma bovis, cattle
Strangeness spin, magnetic moment and strangeness configurations of the proton
The implications of the empirical signatures for the positivity of the
strangeness magnetic moment , and the negativity of the strangeness
contribution to the proton spin , on the possible
configurations of five quarks in the proton are analyzed. The empirical signs
for the values of these two observables can only be obtained in configurations
where the system is orbitally excited and the quark is in the
ground state. The configurations, in which the is orbitally excited,
which include the conventional congfiguration, with the
exception of that, in which the component has spin 2, yield negative
values for . Here the strangeness spin , the strangeness
magnetic moment and the axial coupling constant are calculated
for all possible configurations of the component of the proton. In
the configuration with flavor-spin symmetry, which is
likely to have the lowest energy, is positive and .Comment: 17 page
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Spatial intratumoral heterogeneity and temporal clonal evolution in esophageal squamous cell carcinoma.
Esophageal squamous cell carcinoma (ESCC) is among the most common malignancies, but little is known about its spatial intratumoral heterogeneity (ITH) and temporal clonal evolutionary processes. To address this, we performed multiregion whole-exome sequencing on 51 tumor regions from 13 ESCC cases and multiregion global methylation profiling for 3 of these 13 cases. We found an average of 35.8% heterogeneous somatic mutations with strong evidence of ITH. Half of the driver mutations located on the branches of tumor phylogenetic trees targeted oncogenes, including PIK3CA, NFE2L2 and MTOR, among others. By contrast, the majority of truncal and clonal driver mutations occurred in tumor-suppressor genes, including TP53, KMT2D and ZNF750, among others. Interestingly, phyloepigenetic trees robustly recapitulated the topological structures of the phylogenetic trees, indicating a possible relationship between genetic and epigenetic alterations. Our integrated investigations of spatial ITH and clonal evolution provide an important molecular foundation for enhanced understanding of tumorigenesis and progression in ESCC
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