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相关概念视频

Electron Behavior01:09

Electron Behavior

8.1K
Electrons are negatively charged subatomic particles attracted to and orbit around the positively-charged nucleus of an atom. They reside in spaces associated with energy levels called shells and are further organized into subshells and orbitals within each shell.
Electrons Orbit the Nucleus
Electrons are found in specific locations outside of the nucleus. The shell in which an electron resides indicates the general energy level of the electron: those closer to the nucleus have less energy,...
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Electron Carriers01:24

Electron Carriers

84.9K
Electron carriers can be thought of as electron shuttles. These compounds can easily accept electrons (i.e., be reduced) or lose them (i.e., be oxidized). They play an essential role in energy production because cellular respiration is contingent on the flow of electrons.
Over the many stages of cellular respiration, glucose breaks down into carbon dioxide and water. Electron carriers pick up electrons lost by glucose in these reactions, temporarily storing and releasing them into the electron...
84.9K
Non-ohmic Devices00:51

Non-ohmic Devices

1.1K
In most substances, the current flow is proportional to the voltage applied to it. A simple relationship between the values of current, voltage, and resistance is known as Ohm's law. Nonohmic devices do not exhibit a linear relationship between voltage and current. One such device is the semiconducting circuit element known as a diode. A diode is a circuit device that allows current flow in only one direction.
Consider a simple circuit consisting of a battery, a diode, and a resistor. A...
1.1K
Electron Affinity03:07

Electron Affinity

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The electron affinity (EA) is the energy change for adding an electron to a gaseous atom to form an anion (negative ion).
35.6K
Polymer Classification: Architecture01:14

Polymer Classification: Architecture

2.8K
Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
2.8K
Semiconductors01:22

Semiconductors

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There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
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相关实验视频

Updated: Jul 16, 2025

Encapsulating Cytochrome c in Silica Aerogel Nanoarchitectures without Metal Nanoparticles while Retaining Gas-phase Bioactivity
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空气凝:用于基于WebAssembly的裸金属物联网设备的轻量级访问控制框架

Renju Liu1, Luis Garcia2, Mani Srivastava1

  • 1University of California, Los Angeles Los Angeles, CA, USA.

2021 IEEE/ACM Symposium on Edge Computing : SEC 2021 : proceedings : December 14 - 17, 2021, San Jose, California
|September 22, 2023
PubMed
概括
此摘要是机器生成的。

Aerogel 在裸金属物联网设备上为WebAssembly (Wasm) 引入了一个访问控制框架. 它增强了传感器,执行器和资源的安全性,而不需要信任操作系统,而且开销最小.

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Aesthetically Enhanced Silica Aerogel Via Incorporation of Laser Etching and Dyes
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Aesthetically Enhanced Silica Aerogel Via Incorporation of Laser Etching and Dyes

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A Rapid Synthesis Method for Au, Pd, and Pt Aerogels Via Direct Solution-Based Reduction
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A Rapid Synthesis Method for Au, Pd, and Pt Aerogels Via Direct Solution-Based Reduction

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相关实验视频

Last Updated: Jul 16, 2025

Encapsulating Cytochrome c in Silica Aerogel Nanoarchitectures without Metal Nanoparticles while Retaining Gas-phase Bioactivity
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Aesthetically Enhanced Silica Aerogel Via Incorporation of Laser Etching and Dyes
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科学领域:

  • 计算机科学 计算机科学
  • 嵌入式系统 嵌入式系统
  • 网络安全 网络安全

背景情况:

  • 物联网设备上的分散计算是由延迟,隐私和安全需求驱动的.
  • WebAssembly (Wasm) 微运行时间使物联网设备上的设备独立的二进制文件成为可能.
  • 现有的WASM安全研究忽略了裸金属,没有MMU的物联网设备的访问控制.

研究的目的:

  • 介绍Aerogel,一个用于裸金属物联网设备和WASM运行时间的访问控制框架.
  • 解决边缘设备和资源访问控制中的安全漏洞.
  • 在多租户运行环境中,将WASM应用程序视为租户.

主要方法:

  • 开发了Aerogel,这是用于裸金属物联网设备的访问控制框架.
  • 通过利用Wasm的沙箱来执行访问控制政策.
  • 将运行时处理为一个多租户环境,使用WASM应用程序作为租户.
  • 在基于皮质M4的开发板上进行评估 (nRF52840).

主要成果:

  • Aerogel有效地执行对计算资源和外围设备的访问控制政策.
  • 由Aerogel引入的运行时间开销范围在0.19%至1.04%之间.
  • 额外的能源消耗在18.8%至45.9%之间.

结论:

  • 气凝在裸金属物联网设备上为WASM提供了必不可少的访问控制.
  • 该框架增强了安全性,而不会显著损害设备性能.
  • 气凝可以在资源有限的物联网设备上实现安全的,多租户的WASM执行.