世界上存储,通信和计算信息的技术能力
Martin Hilbert1, Priscila López
1Annenberg School of Communication, University of Southern California, Los Angeles, CA 90089, USA. mhilbert@usc.edu
概括
全球信息技术能力在1986年至2007年间急剧增长. 计算能力增长最快,每年增长58%,而数字存储和电信也出现了显著的增长.
科学领域:
- 信息科学 信息科学 信息科学
- 计算机科学 计算机科学
- 技术研究 技术研究
背景情况:
- 技术进步极大地提高了人类处理和存储信息的能力.
- 了解全球信息技术的规模和增长对于社会和经济分析至关重要.
研究的目的:
- 量化世界对信息存储,通信和计算的技术能力.
- 分析这些产能在1986年至2007年的增长趋势.
- 评估这些领域从模拟技术向数字技术的过渡.
主要方法:
- 估计60个模拟和数字技术的全球技术能力.
- 从1986年到2007年的追踪数据.
- 对存储,通信和计算能力的分析.
主要成果:
- 2007年,全球存储容量为2.9×10^20字节,通信容量为2×10^21字节,计算能力为6.4×10^18指令/秒.
- 通用计算能力每年增长58%.
- 电信容量每年增长28%,存储信息每年增长23%.
- 广播 (单向信息传播) 年均增长不大,为6%.
- 电信在1990年成为主要的数字 (在2007年为99.9%),而数字存储在21世纪初超过了模拟 (在2007年为94%数字).
结论:
- 人类处理信息的技术能力已经呈指数级增长,特别是在计算和电信领域.
- 数字革命从根本上重塑了信息存储和通信.
- 数字技术的持续指数级增长为未来带来了机遇和挑战.
相关概念视频
Storage
A schema is a mental framework that helps individuals organize and interpret information. Schemata, formed from previous experiences, influence how we process new information: how we encode it, the inferences we make, and how we retrieve it. For instance, a schema for what a typical classroom looks like might include desks, a teacher's desk, a whiteboard, and students in such an environment. This expectation helps us quickly understand and navigate new classrooms without needing to analyze each...
System of Memory
Memory is categorized into three major systems: sensory memory, short-term memory (STM), and long-term memory (LTM). These systems differ in their capacity and the duration for which they can hold information. Sensory memory captures raw sensory input from the environment, holding it for just a few seconds or less. For example, on hearing a brief, loud sound, like a car horn honking, the sound seems to linger in the mind for a moment even after it stops. This is an instance of sensory memory...
Working Memory
Working memory refers to a combination of components, including short-term memory and attention, that allow an individual to hold information temporarily as we perform cognitive tasks. It is an essential cognitive function that enables the execution of complex tasks such as problem-solving, comprehension, and reasoning. Unlike short-term memory, which simply involves the storage of information for a brief period, working memory involves the active manipulation and processing of this information.
Understanding Memory
Memory is the retention of information or experiences over time, facilitated through three main processes: encoding, storage, and retrieval. Encoding is the process of inputting information into the memory system. For instance, when listening to a lecture, watching a play, reading a book, or having a conversation, the brain is actively encoding information. This initial stage involves transforming sensory input into a form that can be processed and stored by the brain. Various factors, such as...
Encoding
Information enters the brain through encoding, which is the input of information into the memory system. Once sensory information is received from the environment, the brain labels or codes it. The information is then organized with similar information and connected to existing concepts. Encoding occurs through automatic processing and effortful processing.
Automatic processing involves the encoding of details like time, space, frequency, and the meaning of words, usually done without conscious...
Automatic processing involves the encoding of details like time, space, frequency, and the meaning of words, usually done without conscious...
Energy Stored in Capacitors
A parallel plate capacitor, when connected to a battery, develops a potential difference across its plates. This potential difference is key to the operation of the capacitor, as it determines how much electrical energy the capacitor can store.
By integrating the equation that relates voltage and current in a capacitor, one can derive an equation for the voltage across the capacitor at any given time. This equation is crucial in understanding and predicting the behavior of capacitors in...
By integrating the equation that relates voltage and current in a capacitor, one can derive an equation for the voltage across the capacitor at any given time. This equation is crucial in understanding and predicting the behavior of capacitors in...


