Fichas
AS IT Data Information Knowledge
Fichas del conjunto (51)
- 1DataRaw numbers or letters without meaning
- 2InformationData with context and meaning
- 3KnowledgeInformation to which human experience has been applied
- 4Static dataData that does not normally change
- 5Dynamic dataData that changes automatically without user intervention
- 6Direct data sourceData that is collected for the purpose for which it will be used
- 7Indirect data sourceData that was collected for a different purpose (secondary source)
- 8Features of static information sourceCan go out of date
Viewed offline
More accurate since time taken to create data
Does not change - 9Features of dynamic information sourceCan be up to date
Updated automatically
Likely to be rushed to produce since ability to change
Requires live data e.g. Internet - 10Features of direct data sourceData will be relevant
The source can be trusted
Take a long time to gather
Smaller sample
Up to date
Bias can be excluded
Presented in the format required - 11Features of indirect data sourceToo much or too little data needed
The original source not known
Data immediately available
Large sample
Data out of date
Can be biased
Data not in right format - 12Quality of information aspects:Accuracy
Relevance
Age
Level of detail
Completeness - 13AccuracyData must be factually accurate to be high quality
- 14RelevanceData must be relevant to its purpose to be high quality
- 15AgeInformation must be up to date to be high quality
- 16Level of detailNot have too much or too little amount of data to be high quality
- 17CompletenessAll the data must be present to be high quality
- 18CodingRepresenting data by assigning a code to it for classification or identification
- 19EncodingStoring data in a specific format
- 20EncryptionScrambling data so it cannot be understood without a decryption key to make it unreadable if intercepted
- 21SSLSecure Socket Layer
- 22TLSTransport Layer Security
- 23HTTPSHypertext Transfer Protocol Secure
- 24Advantages of codingPresentation
Storage
Speed of input
Processing
Validation
Confidentiality
Consistency - 25Disadvantages of codingLimited codes
Interpretation
Similarity
Efficiency
Missing information - 26CodecPrograms that are used to encode data for images, audio and video and are also needed to read the data as computers can only understand binary
- 27Text is encoded usingASCII using 256 codes
- 28Images is encoded usingBitmaps where each pixel will what each pixel should display. RLE is another codec which compressed the image to save storage space but reduces quality by removing some original data.
- 29Sound is encoded usingConverted using ADC where the sample rate, bit depth and bit rate are stored.
Bit rate = sample rate x bit depth x number of channels
WAV is uncompressed but has a large storage space
MP3 compressed to reduce storage space but also quality - 30Video is encoded usingImages and sound where the images are stored as frames. The higher the resolution and fps the higher the quality and storage space. The bit rate takes into account the audio and frames processed every second.
- 31Advantages of encoding dataReduce the file size: streaming, reduce download time, enable more storage used
Enable different formats: PNG for different backgrounds, JPG for color depth, BMP for high quality - 32Disadvantages of encoding dataRequires codecs
Not all software can be encoded
Hardware only play using certain formats
Quality of compressed data is reduced
Has to be encoded then decoded - 33Symmetric encryptionRequires the sender and receiver to posses the secret encryption and decryption key. The key needs to be sent to the recipient and can be intercepted
- 34Asymmetric encryptionThis includes a public key which is available to anyone to send data and a private key that only the recipient the has through the use of digital certificates
Used in SSL and TLS - 35Hard diskWhere an encryption key is required to access files on any storage device.
- 36HTTPSUses HTTP with SSL to decrypt pages and information sent by checking the digital certificate of the receipt
- 37EmailUses asymmetric encryption with its contents and attachments
- 38ValidationThe process of checking data matches acceptable rules
- 39VerificationEnsuring data entered into the system matches the original source
- 40Proof readingChecking information manually
- 41Presence checkEnsuring data has been entered
- 42Range checkEnsures data entered is within an acceptable range e.g. greater than or between
- 43Type checkEnsures that data must be of a certain data type
- 44Length checkEnsures data is of a defined character length
- 45Format check (Picture check)Ensures that the data matches a defined format e.g. must be two numbers and four letters
- 46Lookup checkChecks to see if data exists in a list
- 47Consistency checkCheck compares data in one field with data that already exists in another field to see if they are both consistent
- 48Check digitA number or letter is added to the end of an ID number being input
- 49Visual checkingA method of verification by visually checking if the data entered matches the original source and can be done by reading from a screen
- 50Double entryTo input data into a system twice, then compared to see if they match in order to be verified
- 51Proof readingChecking information such as spelling errors
Información
- Descripción
- AS level IT Fichas sobre AS IT Data Information Knowledge, creado por Sean Byrne el 30/03/2017.
- Creado por
- Sean Byrne
- Visitas
- 7
- Valoración