279 research outputs found
Towards a High-Performance Object Detector: Insights from Drone Detection Using ViT and CNN-based Deep Learning Models
Accurate drone detection is strongly desired in drone collision avoidance,
drone defense and autonomous Unmanned Aerial Vehicle (UAV) self-landing. With
the recent emergence of the Vision Transformer (ViT), this critical task is
reassessed in this paper using a UAV dataset composed of 1359 drone photos. We
construct various CNN and ViT-based models, demonstrating that for single-drone
detection, a basic ViT can achieve performance 4.6 times more robust than our
best CNN-based transfer learning models. By implementing the state-of-the-art
You Only Look Once (YOLO v7, 200 epochs) and the experimental ViT-based You
Only Look At One Sequence (YOLOS, 20 epochs) in multi-drone detection, we
attain impressive 98% and 96% mAP values, respectively. We find that ViT
outperforms CNN at the same epoch, but also requires more training data,
computational power, and sophisticated, performance-oriented designs to fully
surpass the capabilities of cutting-edge CNN detectors. We summarize the
distinct characteristics of ViT and CNN models to aid future researchers in
developing more efficient deep learning models.Comment: 7 pages, 23 figures, IEEE Xplore, 2023 International Conference on
Computer Vision and Robotics Scienc
Characterizing subgroup perfect codes by 2-subgroups
A perfect code in a graph is a subset of such that
no two vertices in are adjacent and every vertex in
is adjacent to exactly one vertex in . Let be a finite group and a
subset of . Then is said to be a perfect code of if there exists a
Cayley graph of admiting as a perfect code. It is proved that a
subgroup of is a perfect code of if and only if a Sylow
-subgroup of is a perfect code of . This result provides a way to
simplify the study of subgroup perfect codes of general groups to the study of
subgroup perfect codes of -groups. As an application, a criterion for
determining subgroup perfect codes of projective special linear groups
is given
The Photosynthetic Characteristics of Wild <em>Cymbidium faberi</em> in the Qinling Mountains of Central China
The large flowers of orchids make them popular as cultivated plants. Seven species of orchids in the genus Cymbidium (Orchidaceae) have been crossbred to create more than 220 hybrids that serve as popular cultivated ornamentals. The present study examined the daily variation in the patterns of the net photosynthetic rate and the photosynthetic response of wild Cymbidium faberi in the Qinling Mountains in northwestern China. The photosynthetic characteristics of this species were studied under natural conditions with a portable photosynthesis system. Double peaks were observed in the net photosynthetic rate with one around 09:00 and another around 17:00 in spring, as well as one around 11:00 and another around 15:00 in winter. Midday depression of photosynthesis was observed in wild C. faberi plants around 13:00 in both spring and winter. The net photosynthetic rate was strongly positively correlated with both stomatal conductance (R = 0.913) and the transpiration rate (R = 0.659) and weakly negatively correlated with the intercellular carbon dioxide concentration (R = −0.094). The results show that the light compensation point (LCP) and the light saturation point (LSP) of wild C. faberi were 25.78 and 384 μmol m−2 s−1, respectively. The result provides reference for cultivation management especially in light management of Cymbidium
A novel optimization method on logistics operation for warehouse & port enterprises based on game theory
Purpose: The following investigation aims to deal with the competitive relationship among different warehouses & ports in the same company.
Design/methodology/approach: In this paper, Game Theory is used in carrying out the optimization model. Genetic Algorithm is used to solve the model.
Findings: Unnecessary competition will rise up if there is little internal communication among different warehouses & ports in one company. This paper carries out a novel optimization method on warehouse & port logistics operation model.
Originality/value: Warehouse logistics business is a combination of warehousing services and terminal services which is provided by port logistics through the existing port infrastructure on the basis of a port. The newly proposed method can help to optimize logistics operation model for warehouse & port enterprises effectively. We set Sinotrans Guangdong Company as an example to illustrate the newly proposed method. Finally, according to the case study, this paper gives some responses and suggestions on logistics operation in Sinotrans Guangdong warehouse & port for its future development.Peer Reviewe
Fair Visual Recognition via Intervention with Proxy Features
Deep learning models often learn to make predictions that rely on sensitive
social attributes like gender and race, which poses significant fairness risks,
especially in societal applications, e.g., hiring, banking, and criminal
justice. Existing work tackles this issue by minimizing information about
social attributes in models for debiasing. However, the high correlation
between target task and social attributes makes bias mitigation incompatible
with target task accuracy. Recalling that model bias arises because the
learning of features in regard to bias attributes (i.e., bias features) helps
target task optimization, we explore the following research question: \emph{Can
we leverage proxy features to replace the role of bias feature in target task
optimization for debiasing?} To this end, we propose \emph{Proxy Debiasing}, to
first transfer the target task's learning of bias information from bias
features to artificial proxy features, and then employ causal intervention to
eliminate proxy features in inference. The key idea of \emph{Proxy Debiasing}
is to design controllable proxy features to on one hand replace bias features
in contributing to target task during the training stage, and on the other hand
easily to be removed by intervention during the inference stage. This
guarantees the elimination of bias features without affecting the target
information, thus addressing the fairness-accuracy paradox in previous
debiasing solutions. We apply \emph{Proxy Debiasing} to several benchmark
datasets, and achieve significant improvements over the state-of-the-art
debiasing methods in both of accuracy and fairness
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