17,330 research outputs found
Uncertainty in the manufacturing of fibrous thermosetting composites: A review
Composites manufacturing involves many sources of uncertainty associated with material properties variation and boundary conditions variability. In this study, experimental and numerical results concerning the statistical characterization and the influence of inputs variability on the main steps of composites manufacturing including process-induced defects are presented and analysed. Each of the steps of composite manufacturing introduces variability to the subsequent processes, creating strong interdependencies between the process parameters and properties of the final part. The development and implementation of stochastic simulation tools is imperative to quantify process output variabilities and develop optimal process designs in composites manufacturing
Optimal use of Charge Information for the HL-LHC Pixel Detector Readout
The pixel detectors for the High Luminosity upgrades of the ATLAS and CMS
detectors will preserve digitized charge information in spite of extremely high
hit rates. Both circuit physical size and output bandwidth will limit the
number of bits to which charge can be digitized and stored. We therefore study
the effect of the number of bits used for digitization and storage on single
and multi-particle cluster resolution, efficiency, classification, and particle
identification. We show how performance degrades as fewer bits are used to
digitize and to store charge. We find that with limited charge information (4
bits), one can achieve near optimal performance on a variety of tasks.Comment: 27 pages, 20 figure
DeepVoCoder: A CNN model for compression and coding of narrow band speech
This paper proposes a convolutional neural network (CNN)-based encoder model to compress and code speech signal directly from raw input speech. Although the model can synthesize wideband speech by implicit bandwidth extension, narrowband is preferred for IP telephony and telecommunications purposes. The model takes time domain speech samples as inputs and encodes them using a cascade of convolutional filters in multiple layers, where pooling is applied after some layers to downsample the encoded speech by half. The final bottleneck layer of the CNN encoder provides an abstract and compact representation of the speech signal. In this paper, it is demonstrated that this compact representation is sufficient to reconstruct the original speech signal in high quality using the CNN decoder. This paper also discusses the theoretical background of why and how CNN may be used for end-to-end speech compression and coding. The complexity, delay, memory requirements, and bit rate versus quality are discussed in the experimental results.Web of Science7750897508
Res2Net: A New Multi-scale Backbone Architecture
Representing features at multiple scales is of great importance for numerous
vision tasks. Recent advances in backbone convolutional neural networks (CNNs)
continually demonstrate stronger multi-scale representation ability, leading to
consistent performance gains on a wide range of applications. However, most
existing methods represent the multi-scale features in a layer-wise manner. In
this paper, we propose a novel building block for CNNs, namely Res2Net, by
constructing hierarchical residual-like connections within one single residual
block. The Res2Net represents multi-scale features at a granular level and
increases the range of receptive fields for each network layer. The proposed
Res2Net block can be plugged into the state-of-the-art backbone CNN models,
e.g., ResNet, ResNeXt, and DLA. We evaluate the Res2Net block on all these
models and demonstrate consistent performance gains over baseline models on
widely-used datasets, e.g., CIFAR-100 and ImageNet. Further ablation studies
and experimental results on representative computer vision tasks, i.e., object
detection, class activation mapping, and salient object detection, further
verify the superiority of the Res2Net over the state-of-the-art baseline
methods. The source code and trained models are available on
https://mmcheng.net/res2net/.Comment: 11 pages, 7 figure
Teacher-Students Knowledge Distillation for Siamese Trackers
In recent years, Siamese network based trackers have significantly advanced
the state-of-the-art in real-time tracking. However, state-of-the-art Siamese
trackers suffer from high memory cost which restricts their applicability in
mobile applications having strict constraints on memory budget. To address this
issue, we propose a novel distilled Siamese tracking framework to learn small,
fast yet accurate trackers (students), which capture critical knowledge from
large Siamese trackers (teachers) by a teacher-students knowledge distillation
model. This model is intuitively inspired by a one-teacher vs multi-students
learning mechanism, which is the most usual teaching method in the school. In
particular, it contains a single teacher-student distillation model and a
student-student knowledge sharing mechanism. The first one is designed by a
tracking-specific distillation strategy to transfer knowledge from the teacher
to students. The later is utilized for mutual learning between students to
enable an in-depth knowledge understanding. To the best of our knowledge, we
are the first to investigate knowledge distillation for Siamese trackers and
propose a distilled Siamese tracking framework. We demonstrate the generality
and effectiveness of our framework by conducting a theoretical analysis and
extensive empirical evaluations on several popular Siamese trackers. The
results on five tracking benchmarks clearly show that the proposed distilled
trackers achieve compression rates up to 18 and frame-rates of
FPS with speedups of 3, while obtaining similar or even slightly
improved tracking accuracy
- …