7 research outputs found
Object-fabrication Targeted Attack for Object Detection
Recent researches show that the deep learning based object detection is
vulnerable to adversarial examples. Generally, the adversarial attack for
object detection contains targeted attack and untargeted attack. According to
our detailed investigations, the research on the former is relatively fewer
than the latter and all the existing methods for the targeted attack follow the
same mode, i.e., the object-mislabeling mode that misleads detectors to
mislabel the detected object as a specific wrong label. However, this mode has
limited attack success rate, universal and generalization performances. In this
paper, we propose a new object-fabrication targeted attack mode which can
mislead detectors to `fabricate' extra false objects with specific target
labels. Furthermore, we design a dual attention based targeted feature space
attack method to implement the proposed targeted attack mode. The attack
performances of the proposed mode and method are evaluated on MS COCO and
BDD100K datasets using FasterRCNN and YOLOv5. Evaluation results demonstrate
that, the proposed object-fabrication targeted attack mode and the
corresponding targeted feature space attack method show significant
improvements in terms of image-specific attack, universal performance and
generalization capability, compared with the previous targeted attack for
object detection. Code will be made available
Effects of Fluorine-Based Modification on Triboelectric Properties of Cellulose
The hydroxyl groups on the cellulose macromolecular chain cause the cellulose surface to have strong reactivity. In this study, 1H, 1H, 2H, 2H-perfluorodecyltriethoxysilane (PDOTES) was used to modify cellulose to improve its triboelectric properties, and a triboelectric nanogenerator (TENG) was assembled. The introduction of fluorine groups reduced the surface potential of cellulose and turned it into a negative phase, which enhanced the ability to capture electrons. The electrical properties increased by 30% compared with unmodified cellulose. According to the principles of TENGs, a self-powered human-wearable device was designed using PDOTES-paper, which could detect movements of the human body, such as walking and running, and facilitated a practical method for the preparation of efficient wearable sensors
Power Quality Prediction, Early Warning, and Control for Points of Common Coupling with Wind Farms
Wind farms can affect the power quality (PQ) of the power supply grid, with subsequent impacts on the safe and stable operation of other electrical equipment. A novel PQ prediction, early warning, and control approach for the common coupling points between wind farms and the network is proposed in this paper. We then quantify PQ problems and provide rational support measures. To obtain predicted PQ data, we first establish a trend analysis model. The model incorporates a distance-based cluster analysis, probability distribution analysis based on polynomial fitting, pattern matching based on similarity, and Monte Carlo random sampling. A data mining algorithm then uses the PQ early warning flow to analyze limit-exceeding and abnormal data, quantify their severity, and output early warning prompts. Finally, PQ decision support is applied to inform both the power suppliers and users of anomalous changes in PQ, and advise on corresponding countermeasures to reduce relevant losses. Case studies show that the proposed approach is effective and feasible, and it has now been applied to an actual PQ monitoring platform