6,294 research outputs found
Nucleosome Structure Incorporated Histone Acetylation Site Prediction in \u3ci\u3eArabidopsis thaliana\u3c/i\u3e
Background
Acetylation is a crucial post-translational modification for histones, and plays a key role in gene expression regulation. Due to limited data and lack of a clear acetylation consensus sequence, a few researches have focused on prediction of lysine acetylation sites. Several systematic prediction studies have been conducted for human and yeast, but less for Arabidopsis thaliana. Results
Concerning the insufficient observation on acetylation site, we analyzed contributions of the peptide-alignment-based distance definition and 3D structure factors in acetylation prediction. We found that traditional structure contributes little to acetylation site prediction. Identified acetylation sites of histones in Arabidopsis thaliana are conserved and cross predictable with that of human by peptide based methods. However, the predicted specificity is overestimated, because of the existence of non-observed acetylable site. Here, by performing a complete exploration on the factors that affect the acetylability of lysines in histones, we focused on the relative position of lysine at nucleosome level, and defined a new structure feature to promote the performance in predicting the acetylability of all the histone lysines in A. thaliana. Conclusion
We found a new spacial correlated acetylation factor, and defined a ε-N spacial location based feature, which contains five core spacial ellipsoid wired areas. By incorporating the new feature, the performance of predicting the acetylability of all the histone lysines in A. Thaliana was promoted, in which the previous mispredicted acetylable lysines were corrected by comparing to the peptide-based prediction
StrategyLLM: Large Language Models as Strategy Generators, Executors, Optimizers, and Evaluators for Problem Solving
Most existing chain-of-thought (CoT) prompting methods suffer from the issues
of generalizability and consistency, as they often rely on instance-specific
solutions that may not be applicable to other cases and lack task-level
consistency in their reasoning steps. To address these limitations, we propose
a comprehensive framework, StrategyLLM, harnessing the capabilities of LLMs to
tackle various tasks. The framework improves generalizability by formulating
general problem-solving strategies and enhances consistency by producing
consistent solutions using these strategies. StrategyLLM employs four LLM-based
agents: strategy generator, executor, optimizer, and evaluator, working
together to generate, evaluate, and select promising strategies for a given
task automatically. The experimental results demonstrate that StrategyLLM
outperforms the competitive baseline CoT-SC that requires human-annotated
solutions on 13 datasets across 4 challenging tasks without human involvement,
including math reasoning (39.2% 43.3%), commonsense reasoning
(70.3% 72.5%), algorithmic reasoning (51.7% 62.0%),
and symbolic reasoning (30.0% 79.2%)
PV-RCNN++: Point-Voxel Feature Set Abstraction With Local Vector Representation for 3D Object Detection
3D object detection is receiving increasing attention from both industry and
academia thanks to its wide applications in various fields. In this paper, we
propose Point-Voxel Region-based Convolution Neural Networks (PV-RCNNs) for 3D
object detection on point clouds. First, we propose a novel 3D detector,
PV-RCNN, which boosts the 3D detection performance by deeply integrating the
feature learning of both point-based set abstraction and voxel-based sparse
convolution through two novel steps, i.e., the voxel-to-keypoint scene encoding
and the keypoint-to-grid RoI feature abstraction. Second, we propose an
advanced framework, PV-RCNN++, for more efficient and accurate 3D object
detection. It consists of two major improvements: sectorized proposal-centric
sampling for efficiently producing more representative keypoints, and
VectorPool aggregation for better aggregating local point features with much
less resource consumption. With these two strategies, our PV-RCNN++ is about
faster than PV-RCNN, while also achieving better performance. The
experiments demonstrate that our proposed PV-RCNN++ framework achieves
state-of-the-art 3D detection performance on the large-scale and
highly-competitive Waymo Open Dataset with 10 FPS inference speed on the
detection range of 150m * 150m.Comment: Accepted by International Journal of Computer Vision (IJCV), code is
available at https://github.com/open-mmlab/OpenPCDe
6G Non-Terrestrial Networks Enabled Low-Altitude Economy: Opportunities and Challenges
The unprecedented development of non-terrestrial networks (NTN) utilizes the
low-altitude airspace for commercial and social flying activities. The
integration of NTN and terres- trial networks leads to the emergence of
low-altitude economy (LAE). A series of LAE application scenarios are enabled
by the sensing, communication, and transportation functionalities of the
aircrafts. The prerequisite technologies supporting LAE are introduced in this
paper, including the network coverage and aircrafts detection. The LAE
functionalities assisted by aircrafts with respect to sensing and communication
are then summarized, including the terrestrial and non-terrestrial targets
sensing, ubiquitous coverage, relaying, and traffic offloading. Finally,
several future directions are identified, including aircrafts collaboration,
energy efficiency, and artificial intelligence enabled LAE.Comment: This paper has been submitted to IEEE for possible publicatio
Rethinking the Detection Head Configuration for Traffic Object Detection
Multi-scale detection plays an important role in object detection models.
However, researchers usually feel blank on how to reasonably configure
detection heads combining multi-scale features at different input resolutions.
We find that there are different matching relationships between the object
distribution and the detection head at different input resolutions. Based on
the instructive findings, we propose a lightweight traffic object detection
network based on matching between detection head and object distribution,
termed as MHD-Net. It consists of three main parts. The first is the detection
head and object distribution matching strategy, which guides the rational
configuration of detection head, so as to leverage multi-scale features to
effectively detect objects at vastly different scales. The second is the
cross-scale detection head configuration guideline, which instructs to replace
multiple detection heads with only two detection heads possessing of rich
feature representations to achieve an excellent balance between detection
accuracy, model parameters, FLOPs and detection speed. The third is the
receptive field enlargement method, which combines the dilated convolution
module with shallow features of backbone to further improve the detection
accuracy at the cost of increasing model parameters very slightly. The proposed
model achieves more competitive performance than other models on BDD100K
dataset and our proposed ETFOD-v2 dataset. The code will be available.Comment: 26 pages, 4 figures, 7 table
Exploring virus relationships based on virus-host protein-protein interaction network
<p>Abstract</p> <p>Background</p> <p>Currently, several systems have been proposed to classify viruses and indicate the relationships between different ones, though each system has its limitations because of the complexity of viral origins and their rapid evolution rate. We hereby propose a new method to explore the relationships between different viruses.</p> <p>Method</p> <p>A new method, which is based on the virus-host protein-protein interaction network, is proposed in this paper to categorize viruses. The distances between 114 human viruses, including 48 HIV-1 and HIV-2 viruses, are estimated according to the protein-protein interaction network between these viruses and humans.</p> <p>Conclusions/significance</p> <p>The results demonstrated that our method can disclose not only relationships consistent with the taxonomic results of currently used systems of classification but also the potential relationships that the current virus classification systems have not revealed. Moreover, the method points to a new direction where the functional relationships between viruses and hosts can be used to explore the virus relationships on a systematic level.</p
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