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相关概念视频

Sampling Continuous Time Signal01:11

Sampling Continuous Time Signal

234
In signal processing, a continuous-time signal can be sampled using an impulse-train sampling technique, followed by the zero-order hold method. Impulse-train sampling involves the use of a periodic impulse train, which consists of a series of delta functions spaced at regular intervals determined by the sampling period. When a continuous-time signal is multiplied by this impulse train, it generates impulses with amplitudes corresponding to the signal's values at the sampling points.
In the...
234
Convenience Sampling Method00:55

Convenience Sampling Method

8.9K
Sampling is a technique to select a portion (or subset) of the larger population and study that portion (the sample) to gain information about the population. Data are the result of sampling from a population. The sampling method ensures that samples are drawn without bias and accurately represent the population.
Convenience sampling is a non-random method of sample selection; this method selects individuals that are easily accessible and may result in biased data. For example, a marketing...
8.9K
Sampling Methods: Overview01:06

Sampling Methods: Overview

312
A sample refers to a smaller subset representative of a larger population. In analytical chemistry, studying or analyzing an entire population is often impractical or impossible. Therefore, samples are used to draw inferences and generalize the whole population. The sampling method selects individuals or items from a population to create a sample. Standard sampling methods include random, judgemental, systematic, stratified, and cluster sampling. 
In analytical chemistry, the choice of...
312
Sampling Methods: Sample Types01:18

Sampling Methods: Sample Types

216
Sampling materials are classified into three main types: solid, liquid, and gas.
Solid samples include a variety of substances, such as sediments from water bodies, soil, metals, and biological tissues. Two standard methods for extracting sediments from water bodies are grab sampling and piston coring. Grab sampling involves using a device to collect a discrete sediment sample from the bottom of a water body with minimal disturbance. Grab samples do not always represent the entire area due to...
216
Sampling Plans01:23

Sampling Plans

181
Sampling is a crucial step in analytical chemistry, allowing researchers to collect representative data from a large population. Common sampling methods include random, judgmental, systematic, stratified, and cluster sampling.
Random sampling is a method where each member of the population has an equal chance of being selected for the sample. It involves selecting individuals randomly, often using random number generators or lottery-type methods. For example, when analyzing the properties of a...
181
Sampling Theorem01:15

Sampling Theorem

329
In signal processing, the analysis of continuous-time signals, denoted as x(t), often involves sampling techniques to convert these signals into discrete-time signals. This process is essential for digital representation and manipulation. A critical component in sampling is the train of impulses, characterized by the sampling interval and the sampling frequency. The relationship between these parameters and the original signal's properties dictates the success of the sampling process.
329

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相关实验视频

Updated: Jun 27, 2025

Protocol for Data Collection and Analysis Applied to Automated Facial Expression Analysis Technology and Temporal Analysis for Sensory Evaluation
07:12

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影响和满意度的时间依赖性:一个经验抽样研究.

Petra Anić1, Marko Tončić1

  • 1Department of Psychology, Faculty of Humanities and Social Sciences, University of Rijeka, Rijeka, Croatia.

PsyCh journal
|May 3, 2024
PubMed
概括

瞬间的满意度判断受到即时的情绪状态的影响,影响和满意度显示出一个时间依赖的关系. 这表明,满意度依赖于当前的情感信息.

科学领域:

  • 心理学 心理学 心理学
  • 行为科学 行为科学
  • 情感科学是一种情感科学.

背景情况:

  • 了解情绪和判断之间的动态相互作用在心理学中至关重要.
  • 以前的研究表明,影响和满意可能会重叠,但它们的时间关系需要进一步调查.

研究的目的:

  • 在瞬间的层面上研究影响与满足之间的时间依赖.
  • 检查个人内影响和满意度的交叉相关性和时间一致性.

主要方法:

  • 使用经验采样方法与98名学生在7天内.
  • 通过手持设备,每天通过手持设备管理五次影响和满意度表.
  • 员工滞后交叉相关性来评估影响和满意度之间的时间依赖.

主要成果:

  • 满意度与积极影响 (平均r=0.50) 和消极影响 (平均r=-0.38) 密切相关.
  • 时间滞后显著影响了满意度和情感之间的相关性,解释了大量的差异.
  • 影响和满意度之间的交叉相关性随着时间的延迟显著减少.

结论:

  • 瞬间的满意度判断受到同时可用的情感信息的影响.
关键词:
交叉相关性 交叉相关性一瞬间的影响影响.满意度 满足感 满足感时间依赖性时间依赖性

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  • 感情和满意度表现出一种依赖时间的关系,支持情绪状态在判断形成中的作用.
  • 这些发现凸显了主观幸福指标的动态性和时间敏感性.