Difference between revisions of "Team:Tsinghua-A/background"
| Line 21: | Line 21: | ||
transform: translate3d(0%, 0%, -150px) scale(2); | transform: translate3d(0%, 0%, -150px) scale(2); | ||
color: transparent; | color: transparent; | ||
| + | } | ||
| + | } | ||
| + | @keyframes rightin { | ||
| + | 0% { | ||
| + | transform: translate3d(150%, 0%, 0) ; | ||
| + | opacity:10% | ||
| + | } | ||
| + | 100% { | ||
| + | transform: translate3d(0%, 0%, -150px) ; | ||
| + | opacity:100% | ||
| + | } | ||
| + | } | ||
| + | @keyframes leftin { | ||
| + | 0% { | ||
| + | transform: translate3d(-150%, 0%, 0) ; | ||
| + | opacity:10% | ||
| + | } | ||
| + | 100% { | ||
| + | transform: translate3d(0%, 0%, -150px); | ||
| + | opacity:100% | ||
} | } | ||
} | } | ||
| Line 172: | Line 192: | ||
} | } | ||
</script> | </script> | ||
| + | <script> | ||
| + | var boom = document.querySelector(".timeline-content timeline-card js--fadeInRight"); | ||
| + | window.onscroll = function() { | ||
| + | var top = document.documentElement.scrollTop || document.body.scrollTop; | ||
| + | if(top > (boom.offsetTop - boom.offsetHeight)) { | ||
| + | boom.style.animation = "rightin 1s linear 1" //添加动画 | ||
| + | } | ||
| + | } | ||
| + | </script> | ||
| + | |||
| + | <script> | ||
| + | var boom = document.querySelector(".timeline-content timeline-card js--fadeInLeft"); | ||
| + | window.onscroll = function() { | ||
| + | var top = document.documentElement.scrollTop || document.body.scrollTop; | ||
| + | if(top > (boom.offsetTop - boom.offsetHeight)) { | ||
| + | boom.style.animation = "leftin 1s linear 1" //添加动画 | ||
| + | } | ||
| + | } | ||
| + | </script> | ||
Revision as of 16:14, 21 October 2019
Era of handwriting
For our ancestors, information is simple. The only tools they had for information writing is some simple devices, firstly stones, then brushes and quills, and pens finally. In fact, the society they lived, with less population and lower rate of development, produced much less data than ours today.
Era of paper
As our ancestors wrote information merely by writing literally, all they need for data storage is simply oracle bones, bamboo slips, parchments and eventually papers, which was limited in capacity but well adapted to the traditional tools.
Era of Printing
The emergence of printing technologies changed the world. With printing presses, human was powered for the first time to write large amount of data at a considerable velocity. As the culture developed and scale of society grew rapidly, there was a growing need for information storage.
Era of Book
Single sheets of papers are no longer sufficient to deal with the increasing requirement of storage. Instead, books, the first storage media featured for information density and reading efficiency, was commonly accepted. Though still made of papers, the structure of books made them far denser as well as the catalogs made them easier to retrieve.
Era of Computers
The invention of computer as well as the Internet led human forward into a new era. Computers have greatly changed the style of data: from written words on different materials, to a uniform form of digital binary files. What’s more, with computers’ and Internet’s unprecedented efficiency, the amount of information started to inflate in a high speed.
Era of Book
While computers only read digital files, a novel system suitable to them is required to get them work. Hard disk drives, a technology aimed for massive data’s long-term storage, perfectly played the role of data library. Besides, to manage huge amount of digital data stored in HDDs, file systems were introduced by OS designers.
Era of Big Data
After decades of explosion, we found that the inflating of information is still getting faster. More technologies are applied to observe the world, while more people are using them to record their life. The unprecedent “big data” leave a question for us: how to store them better?
Era of …？
The new data storage material should be dense and compact enough, or we may have to use a lot of resources to make and store them. Besides, stability - the ability to remain lossless after long period of time - after must be taken into account. While HDD is approaching its limit, scientists are turning to an atom-level material: the DNA.
Boom!
Data explosion – the era of big data
The total amount of data of the earth so far: In 2006, the world generated about 180 EB new data. In 2011, this number reached 1.8ZB In 2020, the total amount of data in the world will increase by 44 times to reach 34.2ZB.
