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相关概念视频

Fischer Projections02:18

Fischer Projections

13.3K
Learning to draw Fischer projections of molecules and understanding their relevance plays a crucial role in the visual depiction of organic molecules. A Fischer projection is a two-dimensional projection on a planar surface to simplify the three-dimensional wedge–dash representation of molecules. This is especially helpful in the case of molecules with multiple chiral centers that can be difficult to draw. Here, all the bonds of interest are represented as horizontal or vertical lines.
13.3K
Coordinates and Map Projections01:29

Coordinates and Map Projections

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Coordinates and map projections are essential tools in accurately representing the Earth's surface for various applications, ranging from navigation to spatial analysis. The latitude and longitude coordinate system is a universally recognized framework for defining locations. Latitude specifies the distance of a point north or south of the equator, measured in degrees from 0° at the equator to 90° at the poles. Longitude indicates a location's position east or west of the prime meridian,...
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Newman Projections02:06

Newman Projections

16.9K
Different notations are used to represent the three-dimensional structure of molecules on two-dimensional surfaces. One of the most commonly used representations is the dash-wedge formula. The dashed wedges, solid wedges, and the plane lines indicate the groups situated behind the plane, coming out of the plane, and in the plane, respectively.
The organic molecules rotate across the single bonds leading to numerous temporary three-dimensional structures of varying energy known as...
16.9K
Depth Perception and Spatial Vision01:15

Depth Perception and Spatial Vision

678
Depth perception is the ability to perceive objects three-dimensionally. It relies on two types of cues: binocular and monocular. Binocular cues depend on the combination of images from both eyes and how the eyes work together. Since the eyes are in slightly different positions, each eye captures a slightly different image. This disparity between images, known as binocular disparity, helps the brain interpret depth. When the brain compares these images, it determines the distance to an object.
678
Design Example: Analyzing Capacity Contours for Flood Risk Assessment01:17

Design Example: Analyzing Capacity Contours for Flood Risk Assessment

51
Flood risk assessment involves careful planning and analysis to ensure the safety of communities near water retention structures. Capacity contours are a vital tool in this process, as they illustrate the potential spread of water at specific levels in a given area. In the context of building a bund across a small valley, these contours play a critical role in evaluating the safety of nearby residential areas.In this example, the bund is intended to store stormwater in the valley. The engineers...
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Updated: Jul 11, 2025

A Psychophysics Paradigm for the Collection and Analysis of Similarity Judgments
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A Psychophysics Paradigm for the Collection and Analysis of Similarity Judgments

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解读具有能力的高维投影.

Yang Zhang, Jisheng Liu, Chufan Lai

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    此摘要是机器生成的。

    本研究引入了一种新的基于容量的指标和HiLow系统,用于评估缩小维度 (DR) 的结果. 它提高了高维数据分析和交互式探索的可解释性.

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    科学领域:

    • 数据科学数据科学数据科学
    • 计算机科学 计算机科学
    • 信息可视化 信息可视化

    背景情况:

    • 降低维度 (DR) 对于高维数据分析至关重要.
    • 现有的指标缺乏通用性和交互式探索能力.
    • 需要提高DR结果的解释性和定量分析.

    研究的目的:

    • 提出一个通用,算法无关的指标来评估基于分布忠实性的DR结果.
    • 开发一个交互式视觉分析系统 (HiLow),用于探索高维数据和投影.
    • 提高DR技术的解释性,并促进比较分析.

    主要方法:

    • 开发了一个基于"能力"概念的新型指标来评估DR结果.
    • 创建了HiLow视觉分析系统,用于DR投影的交互式探索和操纵.
    • 提出了一种混合倡议推算法,用于用户指导的DR分析.
    • 引入了一个新的可视化设计,用于对数据分布进行定量比较.

    主要成果:

    • 拟议的容量指标有效地通过不同的算法评估DR结果.
    • 该HiLow系统允许直观的,交互式的探索和对比DR投影.
    • 用户研究和案例研究验证了增强的解释性和分析能力.
    • 该系统有助于对高维和低维数据之间的分布差异进行定量分析.

    结论:

    • 基于能力的方法为DR评估提供了通用和有效的方法.
    • HiLow系统显著提高了高维数据的可解释性和交互式分析.
    • 这项工作解决了现有的DR评估工具的局限性,为研究人员提供了宝贵的资源.