172 research outputs found
High-Performance Fine Defect Detection in Artificial Leather Using Dual Feature Pool Object Detection
In this study, the structural problems of the YOLOv5 model were analyzed
emphatically. Based on the characteristics of fine defects in artificial
leather, four innovative structures, namely DFP, IFF, AMP, and EOS, were
designed. These advancements led to the proposal of a high-performance
artificial leather fine defect detection model named YOLOD. YOLOD demonstrated
outstanding performance on the artificial leather defect dataset, achieving an
impressive increase of 11.7% - 13.5% in AP_50 compared to YOLOv5, along with a
significant reduction of 5.2% - 7.2% in the error detection rate. Moreover,
YOLOD also exhibited remarkable performance on the general MS-COCO dataset,
with an increase of 0.4% - 2.6% in AP compared to YOLOv5, and a rise of 2.5% -
4.1% in AP_S compared to YOLOv5. These results demonstrate the superiority of
YOLOD in both artificial leather defect detection and general object detection
tasks, making it a highly efficient and effective model for real-world
applications
Revisitation of algebraic approach for time delay interferometry
Time Delay Interferometry (TDI) is often utilized in the data pre-processing
of space-based gravitational wave detectors, primarily for suppressing laser
frequency noise. About twenty years ago, assuming armlengths remain constant
over time, researchers presented comprehensive mathematical descriptions for
the first-generation and modified first-generation TDI. However, maintaining a
steady distance between satellites is pragmatically challenging. Hence, the
operator equation that neutralizes laser frequency noise, though provided, was
deemed difficult to resolve. In this paper, we solve this equation in the
context of a non-static scenario where distances between spacecrafts vary over
time. Surprisingly, contrary to what previous researchers thought, the study
reveals that the equation has only the zero solution, which suggests that no
nonzero TDI combination can entirely suppress laser frequency noise under
time-varying armlengths. This necessitates the persistent search for
second-generation TDI combinations through alternative methods besides directly
solving the operator equation. We establish the connections between TDI
combinations of different generations and propose a search strategy for finding
higher-generation TDI combinations by using generators of lower-generation TDI.
The findings contribute to the ongoing discussion on gravitational waves and
provide a novel insight into the hurdles faced in space-based gravitational
wave detection.Comment: accepted by Physical Review
YOLOCS: Object Detection based on Dense Channel Compression for Feature Spatial Solidification
In this study, we examine the associations between channel features and
convolutional kernels during the processes of feature purification and gradient
backpropagation, with a focus on the forward and backward propagation within
the network. Consequently, we propose a method called Dense Channel Compression
for Feature Spatial Solidification. Drawing upon the central concept of this
method, we introduce two innovative modules for backbone and head networks: the
Dense Channel Compression for Feature Spatial Solidification Structure (DCFS)
and the Asymmetric Multi-Level Compression Decoupled Head (ADH). When
integrated into the YOLOv5 model, these two modules demonstrate exceptional
performance, resulting in a modified model referred to as YOLOCS. Evaluated on
the MSCOCO dataset, the large, medium, and small YOLOCS models yield AP of
50.1%, 47.6%, and 42.5%, respectively. Maintaining inference speeds remarkably
similar to those of the YOLOv5 model, the large, medium, and small YOLOCS
models surpass the YOLOv5 model's AP by 1.1%, 2.3%, and 5.2%, respectively
Complementary Skyrmion Racetrack Memory with Voltage Manipulation
Magnetic skyrmion holds promise as information carriers in the
next-generation memory and logic devices, owing to the topological stability,
small size and extremely low current needed to drive it. One of the most
potential applications of skyrmion is to design racetrack memory (RM), named
Sk-RM, instead of utilizing domain wall (DW). However, current studies face
some key design challenges, e.g., skyrmion manipulation, data representation
and synchronization etc. To address these challenges, we propose here a
complementary Sk-RM structure with voltage manipulation. Functionality and
performance of the proposed design are investigated with micromagnetic
simulations.Comment: 3 pages, 4 figure
Detecting Generated Images by Real Images Only
As deep learning technology continues to evolve, the images yielded by
generative models are becoming more and more realistic, triggering people to
question the authenticity of images. Existing generated image detection methods
detect visual artifacts in generated images or learn discriminative features
from both real and generated images by massive training. This learning paradigm
will result in efficiency and generalization issues, making detection methods
always lag behind generation methods. This paper approaches the generated image
detection problem from a new perspective: Start from real images. By finding
the commonality of real images and mapping them to a dense subspace in feature
space, the goal is that generated images, regardless of their generative model,
are then projected outside the subspace. As a result, images from different
generative models can be detected, solving some long-existing problems in the
field. Experimental results show that although our method was trained only by
real images and uses 99.9\% less training data than other deep learning-based
methods, it can compete with state-of-the-art methods and shows excellent
performance in detecting emerging generative models with high inference
efficiency. Moreover, the proposed method shows robustness against various
post-processing. These advantages allow the method to be used in real-world
scenarios
Voltage Controlled Magnetic Skyrmion Motion for Racetrack Memory
Magnetic skyrmion, vortex-like swirling topologically stable spin
configurations, is appealing as information carrier for future nanoelectronics,
owing to the stability, small size and extremely low driving current density.
One of the most promising applications of skyrmion is to build racetrack memory
(RM). Compared to domain wall-based RM (DW-RM), skyrmion-based RM (Sky-RM)
possesses quite a few benefits in terms of energy, density and speed etc. Until
now, the fundamental behaviors, including nucleation/annihilation, motion and
detection of skyrmion have been intensively investigated. However, one
indispensable function, i.e., pinning/depinning of skyrmion still remains an
open question and has to be addressed before applying skyrmion for RM.
Furthermore, Current research mainly focuses on physical investigations,
whereas the electrical design and evaluation are still lacking. In this work,
we aim to promote the development of Sky-RM from fundamental physics to
realistic electronics. First, we investigate the pinning/depinning
characteristics of skyrmion in a nanotrack with the voltage-controlled magnetic
anisotropy (VCMA) effect. Then, we propose a compact model and design framework
of Sky-RM for electrical evaluation. This work completes the elementary memory
functionality of Sky-RM and fills the technical gap between the physicists and
electronic engineers, making a significant step forward for the development of
Sky-RM.Comment: 10 pages, 8 figure
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