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相关概念视频

Visual System01:26

Visual System

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Light enters the eye through the cornea, a transparent, dome-shaped surface covering the surface of the eyeball that helps to direct and focus incoming light. This light is then channeled toward the pupil, an adjustable opening whose size is controlled by the iris. The iris, a pigmented muscle, regulates the amount of light entering the eye by contracting or dilating the pupil, thereby ensuring optimal light levels for clear vision.
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Vision01:24

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Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.
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At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...
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Parallel Processing01:20

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The brain processes sensory information rapidly due to parallel processing, which involves sending data across multiple neural pathways at the same time. This method allows the brain to manage various sensory qualities, such as shapes, colors, movements, and locations, all concurrently. For instance, when observing a forest landscape, the brain simultaneously processes the movement of leaves, the shapes of trees, the depth between them, and the various shades of green. This enables a quick and...
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Optical microscopy uses optic principles to provide detailed images of samples. Antonie van Leeuwenhoek designed the first compound optical microscope in the 17th century to visualize blood cells, bacteria, and yeast cells. In 1830, Joseph Jackson Lister created an essentially modern light microscope. The 20th century saw the development of microscopes with enhanced magnification and resolution.
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HZO/HSO超晶格 ReFET 阵列集成光学传感器用于神经形象视觉计算.

Bingjie Dang1, Kaixuan Sun1,2,3, Hanxin Su1,2,3

  • 1Department of Materials Science and Engineering, National University of Singapore, Singapore, 117575, Singapore.

Advanced materials (Deerfield Beach, Fla.)
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概括

本研究介绍了一种用于神经形态视觉系统的新型光子电阻门场效应晶体管 (ReFET) 阵列. 该设备集成了光学传感,内存和计算,克服了传统人工突触的局限性,用于增强的传感器内计算.

关键词:
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科学领域:

  • 材料科学 材料科学 材料科学
  • 神经科学是一个神经科学.
  • 计算机工程 计算机工程

背景情况:

  • 神经形态视觉系统需要人工突触来进行精确的感知,记忆和计算.
  • 传统的内存晶体管和晶体管在稳定性,耐久性和整合性方面存在限制.

研究的目的:

  • 开发一种新的设备,集成光学传感,内存和模拟计算,用于神经形态应用.
  • 克服现有的人工突触技术的局限性.

主要方法:

  • 一个光子电阻门场效应晶体管 (ReFET) 阵列是使用Hf0.5Zr0.5O2/Hf0.95Sr0.05O2 (HZO/HSO) 超级网格门和无形的InGaZnO (IGZO) 通道制造的.
  • 设备阵列的特点是其内存状态,耐久性,保留和开/关比.
  • 作为在传感器内执行多重积累 (MAC) 操作的光学卷积层,该阵列的性能使用时尚-MNIST数据集进行了评估.

主要成果:

  • ReFET阵列显示了272个稳定的多层电导状态 (>8位),ON/OFF比率>106,耐久性>1010周期,保留>106秒.
  • 该阵列成功地执行了传感器内光学卷积层操作,在Fashion-MNIST上实现了94.45%的准确性,使用了8位量子化权重.
  • 该平台在神经形态计算任务中表现出高能效.

结论:

  • 开发的 ReFET 阵列为光子神经形态计算提供了一个可扩展,高精度和节能的平台.
  • 这种集成的架构成功地将光学传感,内存和计算在一个单一的设备中结合在一起,推进了传感器内计算能力.