144 research outputs found
Self-Supervised Texture Image Anomaly Detection By Fusing Normalizing Flow and Dictionary Learning
A common study area in anomaly identification is industrial images anomaly
detection based on texture background. The interference of texture images and
the minuteness of texture anomalies are the main reasons why many existing
models fail to detect anomalies. We propose a strategy for anomaly detection
that combines dictionary learning and normalizing flow based on the
aforementioned questions. The two-stage anomaly detection approach already in
use is enhanced by our method. In order to improve baseline method, this
research add normalizing flow in representation learning and combines deep
learning and dictionary learning. Improved algorithms have exceeded 95
detection accuracy on all MVTec AD texture type data after experimental
validation. It shows strong robustness. The baseline method's detection
accuracy for the Carpet data was 67.9%. The article was upgraded, raising the
detection accuracy to 99.7%
Non-Hermitian skin effect and nonreciprocity induced by dissipative couplings
We study the mechanism for realizing non-Hermitian skin effect (NHSE) via
dissipative couplings, in which the left-right couplings have equal strengths
but the phases do not satisfy the complex conjugation. Previous realizations of
NHSE typically require unequal left-right couplings or on-site gain and loss.
In this work we find that when combined with the multichannel interference
provided by a periodic dissipative-coherent coupling structure, the dissipative
couplings can lead to unequal left-right couplings, inducing NHSE. Moreover, we
show that the non-Hermiticity induced by dissipative couplings can be fully
transformed into nonreciprocity-type non-Hermiticity without bringing extra
gain-loss-type non-Hermiticity. Thus, this mechanism enables unidirectional
energy transmission without introducing additional insertion loss. Our work
opens a new avenue for the study of non-Hermitian topological effects and the
design of directional optical networks
A Counting Method of Red Jujube Based on Improved YOLOv5s
Due to complex environmental factors such as illumination, shading between leaves and fruits, shading between fruits, and so on, it is a challenging task to quickly identify red jujubes and count red jujubes in orchards. A counting method of red jujube based on improved YOLOv5s was proposed, which realized the fast and accurate detection of red jujubes and reduced the model scale and estimation error. ShuffleNet V2 was used as the backbone of the model to improve model detection ability and light the weight. In addition, the Stem, a novel data loading module, was proposed to prevent the loss of information due to the change in feature map size. PANet was replaced by BiFPN to enhance the model feature fusion capability and improve the model accuracy. Finally, the improved YOLOv5s detection model was used to count red jujubes. The experimental results showed that the overall performance of the improved model was better than that of YOLOv5s. Compared with the YOLOv5s, the improved model was 6.25% and 8.33% of the original network in terms of the number of model parameters and model size, and the Precision, Recall, F1-score, AP, and Fps were improved by 4.3%, 2.0%, 3.1%, 0.6%, and 3.6%, respectively. In addition, RMSE and MAPE decreased by 20.87% and 5.18%, respectively. Therefore, the improved model has advantages in memory occupation and recognition accuracy, and the method provides a basis for the estimation of red jujube yield by vision
Test research on seismic performance of story-adding frame structure
U radu se opisuju usporedni eksperimenti između metode za dodatnu konstrukciju kata od armiranog betona i one od lakog čelika. Ispitivanje kvazi-statičkog testa te usporedba i analiza eksperimentalnih rezultata također su provedeni i za okvir dodatne konstrukcije od armiranog betona kao i za onaj od lakog čelika pri istim radnim uvjetima. Rezultati su pokazali da iako obije konstrukcije okvira donekle zadovoljavaju seizmičke zahtjeve, postoje i jasne prednosti i nedostaci u obije metode. Rezultati dalje ukazuju i primjenjivost i relevantne probleme na koje je potrebno usmjeriti pozornost za obije metode dodatka kata.This paper conducts comparative experiments between reinforced concrete story-adding structure and the lightweight steel story-adding method. Quasi-static test research and a comparison and analysis of the experimental results are also performed for both reinforced concrete story-adding framework and light steel story-adding under the same working conditions. The results showed that although both structural frameworks do meet seismic construction requirements to some degree, the results of experimentation reflect distinct advantages and disadvantages for both methods. Results further indicate the applicability and relevant problems requiring attention for both story-adding methods
Bacillus subtilis Inhibits Vibrio natriegens-Induced Corrosion via Biomineralization in Seawater
The marine bacterium, Vibrio natriegens, grows quickly in a marine environment and can significantly accelerate the corrosion of steel materials. Here, we present an approach to inhibit V. natriegens-induced corrosion by biomineralization. The corrosion of steel is mitigated in seawater via the formation of a biomineralized film induced by Bacillus subtilis. The film is composed of extracellular polymeric substances (EPS) and calcite, exhibiting stable anti-corrosion activity. The microbial diversity and medium chemistry tests demonstrated that the inhibition of V. natriegens growth by B. subtilis was essential for the formation of the biomineralized film
Evaluation of associations between genetically predicted circulating protein biomarkers and breast cancer risk.
A small number of circulating proteins have been reported to be associated with breast cancer risk, with inconsistent results. Herein, we attempted to identify novel protein biomarkers for breast cancer via the integration of genomics and proteomics data. In the Breast Cancer Association Consortium (BCAC), with 122,977 cases and 105,974 controls of European descendants, we evaluated the associations of the genetically predicted concentrations of >1,400 circulating proteins with breast cancer risk. We used data from a large-scale protein quantitative trait loci (pQTL) analysis as our study instrument. Summary statistics for these pQTL variants related to breast cancer risk were obtained from the BCAC and used to estimate odds ratios (OR) for each protein using the inverse-variance weighted method. We identified 56 proteins significantly associated with breast cancer risk by instrumental analysis (false discovery rate <0.05). Of these, the concentrations of 32 were influenced by variants close to a breast cancer susceptibility locus (ABO, 9q34.2). Many of these proteins, such as insulin receptor, insulin-like growth factor receptor 1 and other membrane receptors (OR: 0.82-1.18, p values: 6.96 × 10-4 -3.28 × 10-8 ), are linked to insulin resistance and estrogen receptor signaling pathways. Proteins identified at other loci include those involved in biological processes such as alcohol and lipid metabolism, proteolysis, apoptosis, immune regulation and cell motility and proliferation. Consistent associations were observed for 22 proteins in the UK Biobank data (p < 0.05). The study identifies potential novel biomarkers for breast cancer, but further investigation is needed to replicate our findings.Includes CRUK and FP7
An integrative multi-omics analysis to identify candidate DNA methylation biomarkers related to prostate cancer risk
Abstract: It remains elusive whether some of the associations identified in genome-wide association studies of prostate cancer (PrCa) may be due to regulatory effects of genetic variants on CpG sites, which may further influence expression of PrCa target genes. To search for CpG sites associated with PrCa risk, here we establish genetic models to predict methylation (N = 1,595) and conduct association analyses with PrCa risk (79,194 cases and 61,112 controls). We identify 759 CpG sites showing an association, including 15 located at novel loci. Among those 759 CpG sites, methylation of 42 is associated with expression of 28 adjacent genes. Among 22 genes, 18 show an association with PrCa risk. Overall, 25 CpG sites show consistent association directions for the methylation-gene expression-PrCa pathway. We identify DNA methylation biomarkers associated with PrCa, and our findings suggest that specific CpG sites may influence PrCa via regulating expression of candidate PrCa target genes
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