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Lost Notes

What is this?

These are notes before 27/9, scrapped from Mr.Chun's Doceri document. (thanks :p) It is [known] that there are missing parts, so don't over rely on this.

What is data ?

There are many types of data.

  • Photo / Images
  • Texts / Documents (Microsoft Word)
  • Audio / Voice / Sound
  • Video (Note: Photo + Audio = Video)

Data

Classified into Text and Numbers.

  • Text is made up of different characterizations.
  • Different characterizations for different words, ASCII / Unicode for English and BIG5 For Chinese.
  • All these (ASCII, BIG5, etc.) are all just Hexadecimal numbers, and the computer knows how to read them into human-readable text.
  • For example, 秦 is 3210 in BIG5.
    • GB Code (GuoBiao Index, GB2312) is a index database used for simplified Chinese characters.
    • Big5 is a index database for traditional Chinese characters.
    • Unicode is mainly English. It has Chinese characters tho (in total, 74605 CJK Characters).

Extra: 255 and 127

255 and 127 are commonly seen numbers.

255 = (2^8) - 1

127 = (2^7) - 1

Jobs related to Data

  • System analyist (analyzes stuff)
  • Programmer (writes programs to make life easier)
  • Technicians (the ones that monitor the system while it's running, extremely low salary.)
  • Network Manager / System Administrator
  • Data Entry Operator (inputs all the data into PC.)

Applications types

  • Word processing applications (Microsoft Word)
  • Spreadsheets (Microsoft Excel, Google sheets)
  • Presentation Software (Powerpoint, Prezi)
  • Database Software (Microsoft Access)
  • Communication Software (WhatsApp, Telegram)
  • Multimedia Production (Photoshop, Movie Maker)

Office Automation

  • Increases work efficiency / productivity
  • Bettter communications of data
  • Better data management

Applications of data

  • Data Application (Produce data)
  • Data storage (Store the created data, on hard disk, USB flash drive, Network drive, etc.)
  • Data exchange (Communication. Can be exchanged via methods mentioned in data storage.)
  • Data Management

Types of Data management

  • Data validation (to check if all data is valid / clean / meaningful and not bogus)
  • Data verification (to check if copies of the data is as good as the original)
  • Data organization (to organize existing data to make them more usable)
  • Data preperation (process of cleaning and transfering raw data)
  • Data collection (process of gathering and measuring information on variables of interest. data preparation is active but data collection is passive. Further citation needed.)