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相关概念视频

What is Variation?01:14

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Apart from the measures of central tendency, distribution, outliers, and the changing characteristics of data with time, an important characteristic of any data set is its variation or spread. In some data sets, the data values are concentrated closely near the mean; in others, the data values are more widely spread out from the mean.
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In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
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The term "intelligence" is complex because it refers to both behavior and individuals, and its interpretation varies across cultures. European Americans tend to link intelligence with reasoning and cognitive skills, while in Kenya, it is tied to responsible participation in family and social life. In Uganda, intelligence is seen as the ability to know the right actions and carry them out effectively, while the Iatmul people of Papua New Guinea associate it with the capacity to remember...
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Variation01:19

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An important characteristic of any set of data is the variation in the data. In some data sets, the data values are concentrated closely near the mean; in other data sets, the data values are more widely spread out from the mean. The most common measure of variation, or spread, is the standard deviation, which is the square root of variance.
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If you want to understand how behavior occurs, one of the best ways to gain information is to simply observe the behavior in its natural context. However, people might change their behavior in unexpected ways if they know they are being observed. How do researchers obtain accurate information when people tend to hide their natural behavior? As an example, imagine that your professor asks everyone in your class to raise their hand if they always wash their hands after using the restroom. Chances...
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Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
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耳朵大小和位置的变化是由随意观察者在人工智能生成的模型上评价的.

Kai C Kokesh1, Kathleen Sie2, Randall Bly2

  • 1School of Medicine, University of Washington, Seattle, Washington, USA.

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随意观察者最容易注意到耳朵大小变化超过10%,后耳角变化超过10度. 突出和垂直位置的变化不那么明显.

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科学领域:

  • 面部美学 面部美学
  • 感知科学是一种感知科学.
  • 整形外科手术 整形外科手术

背景情况:

  • 耳孔不对称性显著影响面部美学.
  • 随意观察者对耳朵不对称的感知值还没有得到很好的定义.

研究的目的:

  • 量化随意观察者对耳朵大小,角度,突出和垂直位置的感知.
  • 为不同类型的耳部不对称性建立感知值.

主要方法:

  • 利用人工智能生成的面部图像,控制耳朵大小,角度,突出和垂直位置的单边变化.
  • 200名参与者对46张图像进行了评分,这些图像以0-10的利克尔特尺度对耳朵的外观进行评分.

主要成果:

  • 尺寸变化≥10%被认为是显著不同的 (p < 0.001).
  • ≥10°的逆向角和20°的逆向角被认为是显著不同的 (p < 0.001).
  • 积极的突出不对称性被认为比负的突出不对称性更严重;垂直位置的变化被认为是最不关键的.

结论:

  • 随意观察者对耳朵大小和逆向角度不对称性更敏感.
  • 对于观察者来说,对耳朵突起和垂直位置不对称的感知不那么重要.