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Start Over Author "Li, Boyu" Publication Type Academic Journals
364 results on '"Li, Boyu"'

18. Survey of Image Adversarial Example Defense Techniques

Author

LIU Ruiqi, LI Hu, WANG Dongxia, ZHAO Chongyang, LI Boyu

Subjects
adversarial examples, artificial intelligence security, adversarial defense, Electronic computers. Computer science, QA75.5-76.95
Abstract

The rapid and extensive growth of artificial intelligence introduces new security challenges. The generation and defense of adversarial examples for deep neural networks is one of the hot spots. Deep neural networks are most widely used in the field of images and most easily cheated by image adversarial examples. The research on the defense techniques for image adversarial examples is an important tool to improve the security of AI applications. There is no standard explanation for the existence of image adversarial examples, but it can be observed and understood from different dimensions, which can provide insights for proposing targeted defense approaches. This paper sorts out and analyzes current mainstream hypotheses of the reason for the existence of adversarial examples, such as the blind spot hypothesis, linear hypothesis, decision boundary hypothesis, and feature hypothesis, and the correlations between various hypotheses and typical adversarial example generation methods. Based on this, this paper summarizes the image adversarial example defense techniques in two dimensions, model-based and data-based, and compares and analyzes the adaptation scenarios, advantages and disadvantages of different technical methods. Most of the existing image adversarial example defense techniques are aimed at defending against specific adversarial example generation methods, and there is no universal defense theory and method yet. In the real application, it needs to consider the specific application scenarios, potential security risks and other factors, optimize and combine the configuration in the existing defense methods. Future researchers can deepen their technical research in terms of generalized defense theory, evaluation of defense effectiveness, and systematic protection strategies.

Published
2023
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44. High‐Pressure Growth and Characterization of Seven‐Layered CuBa2Ca6Cu7O17±δ Single Crystals.

Author

Ming, Xue, Li, Boyu, Zheng, Bo, Liu, Yuecong, Zhang, Yuhang, Li, Tian‐Yi, He, Chengping, Zhu, Xiyu, Song, Dongsheng, Ge, Binghui, and Wen, Hai‐Hu

Subjects
*CUPRATES, *SUPERCONDUCTIVITY, *MAGNETIZATION measurement, *UNIT cell, *CRITICAL currents, *SUPERCONDUCTING transition temperature
Abstract

In cuprates, the superconducting transition temperature (Tc) is closely related to the number n of CuO2 planes per unit cell. The studies on multi‐layered cuprates offer insights into the physical properties and pairing mechanisms of superconductivity. However, the synthesis and stability of ultra‐multilayered cuprates pose significant challenges. Here, a newly discovered seven‐layered cuprate CuBa2Ca6Cu7O17±δ grown under high pressure is reported. Magnetization and transport measurements confirm bulk superconductivity with Tc of ≈85 K. The magnetization hysteresis loops, critical current density (Jc), and irreversibility fields of CuBa2Ca6Cu7O17±δ are also investigated. The novel compound CuBa2Ca6Cu7O17±δ provides an ideal platform for studying the physics of multi‐layered cuprates. [ABSTRACT FROM AUTHOR]

Published
2024
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