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相关概念视频

Stereoisomers02:32

Stereoisomers

17.4K
On the basis of mirror symmetry, stereoisomers of an organic molecule can be further classified into diastereomers and enantiomers. Diastereomers are stereoisomers that are not mirror images of each other. Substituted alkenes, such as the cis and trans isomers of 2-butene, are diastereomers, as these molecules exhibit different spatial orientations of their constituent atoms, are not mirror images of each other, and do not interconvert. Here, the interconversion is suppressed due to...
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¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

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When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
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Masking and Demasking Agents01:19

Masking and Demasking Agents

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EDTA titrations may necessitate masking and demasking agents to temporarily protect a particular metal ion in a mixture from the EDTA reaction. These agents facilitate the sequential analysis of the metal ions by forming stable complexes with some—but not all—metal ions during certain steps.
There are many masking agents, such as cyanide, fluoride, triethanolamine, thiourea, and 2,3-bis(sulfanyl)propan-1-ol (formerly 2,3-dimercapto-1-propanol), with the masking agent chosen based on...
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Extraction: Advanced Methods00:56

Extraction: Advanced Methods

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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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Reconstruction of Signal using Interpolation01:10

Reconstruction of Signal using Interpolation

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Signal processing techniques are essential for accurately converting continuous signals to digital formats and vice versa. When a continuous signal is sampled with a period T, the resulting sampled signal exhibits replicas of the original spectrum in the frequency domain, spaced at intervals equal to the sampling frequency. To handle this sampled signal, a zero-order hold method can be applied, which creates a piecewise constant signal by retaining each sample's value until the next...
682
Censoring Survival Data01:09

Censoring Survival Data

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Survival analysis is a statistical method used to analyze time-to-event data, often employed in fields such as medicine, engineering, and social sciences. One of the key challenges in survival analysis is dealing with incomplete data, a phenomenon known as "censoring." Censoring occurs when the event of interest (such as death, relapse, or system failure) has not occurred for some individuals by the end of the study period or is otherwise unobservable, and it might have many different...
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相关实验视频

Updated: Jun 28, 2026

STFEEG-Tool: A Spatial-Temporal-Frequency EEG Analysis Tool for Motor Imagery Brain-Computer Interfaces
05:36

STFEEG-Tool: A Spatial-Temporal-Frequency EEG Analysis Tool for Motor Imagery Brain-Computer Interfaces

Published on: March 10, 2026

基于优化驱动的基于融合地图和吹鱼加密的隐形图形系统.

Ahmed Aljughaiman1, Rana Alrawashdeh2

  • 1Department of Computer Networks and Communications, College of Computer Sciences and Information Technology, King Faisal University, Al-Ahsa, 31982, Saudi Arabia. aaaljughaiman@kfu.edu.sa.

Scientific reports
|January 9, 2026
PubMed
概括

本研究介绍了使用进化优化和融合地图进行安全数据嵌入的自适应图像隐形图. 新的框架平衡了高容量和视觉质量,有效地抵制了深度学习的阶段分析.

关键词:
吹鱼是什么意思 吹鱼是什么意思合并地图 (Fused Maps) 是一种融合地图.粒子集群优化 (PSO) 是一个史蒂冈图形 (Steganography) 是一种隐藏的图形.

相关实验视频

Last Updated: Jun 28, 2026

STFEEG-Tool: A Spatial-Temporal-Frequency EEG Analysis Tool for Motor Imagery Brain-Computer Interfaces
05:36

STFEEG-Tool: A Spatial-Temporal-Frequency EEG Analysis Tool for Motor Imagery Brain-Computer Interfaces

Published on: March 10, 2026

科学领域:

  • 数字图像处理是数字图像处理.
  • 信息安全信息安全.
  • 计算机视觉 计算机视觉 计算机视觉

背景情况:

  • 石学隐藏图像中的数据,但平衡不可察觉性,容量和稳定性与先进的石分析是具有挑战性的.
  • 深度学习 (DL) 方法对传统的隐形图谱技术构成重大威胁.

研究的目的:

  • 提出一个新的自适应图像隐形图像框架.
  • 为了提高安全性和视觉质量,同时保持高数据嵌入能力.
  • 为了确保对基于统计和DL的稳定分析具有抗性.

主要方法:

  • 使用BOSSbase和USC-SIPI数据集进行掩护和秘密图像.
  • 实现了Blowfish密码加密,以保证秘密数据的保密性.
  • 使用和拉普拉斯噪声地图生成一个融合地图,以获得最佳的嵌入区域.
  • 用于嵌入位置选择和订单的粒子群优化 (PSO).
  • 应用优先指导的最不重要的比特 (LSB) 替代数据嵌入.

主要成果:

  • 达到了51-61dB的高峰信号噪声比 (PSNR) 和0.9972-1.0.0的结构相似度指数 (SSIM).
  • 证明了完美的秘密重建 (SSIM = 1.000) 嵌入容量高达0.1-1.0比特每像素 (BPP).
  • 安全测试显示不可检测的隐形图形,曲线下面积 (AUC) 为0.49-0.57和正则单数 (RS) 统计数据为0.59-0.66.
  • 嵌入和提取处理时间低于0.25秒.

结论:

  • 拟议的自适应式隐形图框架有效平衡了容量,视觉质量和安全性.
  • 该系统证明了对复杂的DL-basedsteganalysis,包括卷积神经网络 (CNN) 的稳定性.
  • 该方法为安全隐藏在数字图像中的数据提供了一个实用的解决方案.