信息存储发展史
重阳节祝福老人的句子信息存储发展史美国军工企业
远古信息存储
1.结绳记事
瓷砖排名中秋祝福语简短最火结绳记事是文字发明前,人们所使用的一种记事方法。即在一条绳子上打结,用以记事。上古时期的中国及秘鲁印地安人皆有此习惯,即到近代,一些没有文字的民族,仍然采用结绳记事来传播信息
上古无文字,结绳以记事。《易(系辞下》:"上古结绳而治,后世圣人易之以书契。"孔颖达疏:"结绳者,郑康成注云,事大大结其绳,事小小结其绳,义或然
也。"晋葛洪《抱朴子(钧世》:"若舟车之代步涉,文墨之改结绳,诸后作而善于前事。"后以指上古时代。 例如:奇普(Quipu或khipu)是古代印加人的一种结绳记事的方法,用来计数或者记录历史。它是由许多颜的绳结编成的。这种结绳记事方法已经失传,目前还没有人能够了解其全部含义。 结绳记事(计数):原始社会创始的以绳结形式反映客观经济活动及其数量关系的记录方式。结绳记事(计数)是被原始先民广泛使用的记录方式之一。文献记载:“上古结绳而治,后世圣人易以书契,百官以治,万民以察”(《易?系辞下》)。 虽然目前末发现原始先民遗留下的结绳实物,但原始社会绘画遗存中的网纹图、陶器上的绳纹和陶制网坠等实物均提示出先民结网是当时渔猎的主要条件,因此,结绳记事(计数)作为当时的记录方式具有客观基础的。 其结绳方法,据古书记载为:“事大,大结其绳;事小,小结其绳, 之多少,随物众寡”(《易九家言》),即根据事件的性质、规模或所涉数量的不同结系出不同的绳结。民族学资料表明,近现代有些少数民族仍在采用结绳的方式来记录客观活动 儿童营养品
2.甲骨文文字纸张
甲骨文是中国已发现的古代文字中时代最早、体系较为完整的文字。甲骨文主要指殷墟甲
骨文,又称为“殷墟文字”、“殷契”,是殷商时代刻在龟甲兽骨上的文字。19世纪末年在殷代都城遗址被今河南安阳小屯发现,继承了陶文的造字方法,是中国商代后期(前14,前11世estructuring, encouraging private enterprises and SMEs to become new force to attract foreign investment. In short, no matter what form, what kind of activities are funded, the project landed as the final standard. Third, investment team to fully professional. Investment staff as special commodities salesman, in addition to some financial, investment, trade, and industry expertise, also need to understand and fully grasp the existing leading industry, resources, potential market and mature projects, so that it can be targeted in the investment process, focused attention to related industry in less developed areas, effectively capture business opportunities, find the docking point. Departments, town street, to arrange a team, composed of professional work team, specializing in "three." On this will be issued on the investment promotion activities, to monitor implementation and ensure that these activities are real, tangible results. Investment staff professionalism, dedication to decide investment results and hope that the majority of business personnel and the love for the work ... ... Love reflects on the inv
estment, dedication, set up national feelings, love and dedication, passion, merchants, and strive to achieve better results. (Iv) optimizing "three" working conditions. One is to speed up the construction.
纪)王室用于占卜记事而刻(或写)在龟甲和兽骨上的文字。
金融市场的分类古人以上等蚕茧抽丝织绸,剩下的恶茧、病茧等则用漂絮法制取丝绵。漂絮完毕,篾席上会遗留一些残絮。当漂絮的次数多了,篾席上的残絮便积成一层纤维薄片,经晾干之后剥离下来,可用于书写。这种漂絮的副产物数量不多,在古书上称它为赫蹏或方絮。这表明了中国造纸术的起源同丝絮有着渊源关系。东汉元兴元年(105)蔡伦发明造纸术。他用树皮
、麻头及敝布、鱼网等植物原料,经过挫、捣、抄、烘等工艺制造的纸,是现代纸的渊源。 公元三到六世纪的魏晋南北朝时期,我国造纸术不断革新。在原料方面,除原有的麻、楮外,又扩展到用桑皮、藤皮造纸。 蔡伦首先使用树皮造纸,树皮是比麻类丰富得多的原料,这可以使纸的产量大幅度的提高。树皮中所含的木素、果胶、蛋白质远比麻类高,因此树皮的脱胶、制浆要比麻类难度大。这就促使蔡伦改进造纸的技术。西汉时利用石灰水制浆,东汉
时改用草木灰水制浆,草木灰水有较大的碱性,有利于提高纸浆的质量。
现代信息存储技术
1.磁介质存储技术
1.磁带
UNIVAC-I第一次采用磁带机作外存储器,首先用奇偶校验方法和双重运算线路来提高系统
的可靠性,并最先进行了自动编程的试验。
磁带是所有存储器设备发展中单位存储信息成本最低、容量最大、标准化程度最高的常用存储介质之一。它互换性好、易于保存,近年来,由于采用了具有高纠错能力的编码技术和即写即读的通道技术,大大提高了磁带存储的可靠性和读写速度。根据读写磁带的工作原理可分为螺旋扫描技术、线性记录(数据流)技术、DLT技术以及比较先进的LTO技术。
根据读写磁带的工作原理,磁带机可以分为六种规格。其中两种采用螺旋扫描读写方式的是面向工作组级的DAT(4mm)磁带机和面向部门级的8mm磁带机,另外四种则是选用数据流存储技术设计的设备,它们分别是采用单磁头读写方式、磁带宽度为1/4英寸、面向低端应用的Travan和DC系列,以及采用多磁头读写方式、磁带宽度均为1/2英寸、面向高端应
用的DLT和IBM的3480/3490/3590系列等。
磁带库是基于磁带的备份系统,它能够提供同样的基本自动备份和数据恢复功能,但同时具有更先进的技术特点。它的存储容量可达到数百PB,可以实现连续备份、自动搜索磁带,也可以在驱动管理软件控制下实现智能恢复、实时监控和统计,整个数据存储备份过程完全estructuring, encouraging private enterprises and SMEs to become new force to attract foreign investment. In short, no matter what form, what kind of activities are funde
d, the project landed as the final standard. Third, investment team to fully professional. Investment staff as special commodities salesman, in addition to some financial, investment, trade, and industry expertise, also need to understand and fully grasp the existing leading industry, resources, potential market and mature projects, so that it can be targeted in the investment process, focused attention to related industry in less developed areas, effectively capture business opportunities, find the docking point. Departments, town street, to arrange a team, composed of professional work team, specializing in "three." On this will be issued on the investment promotion activities, to monitor implementation and ensure that these activities are real, tangible results. Investment staff professionalism, dedication to decide investment results and hope that the majority of business personnel and the love for the work ... ... Love reflects on the investment, dedication, set up national feelings, love and dedication, passion, merchants, and strive to achieve better results. (Iv) optimizing "three" working conditions. One is to speed up the construction.

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