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Ch 1 information system
 

Ch 1 information system

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    Ch 1 information system Ch 1 information system Presentation Transcript

    • 11 Chapter # 1Chapter # 1 Information SystemInformation System
    • 22 Data & InformationData & Information DATADATA  Collection of facts andCollection of facts and figuresfigures  Representation ofRepresentation of informationinformation  NumericNumeric AlphabeticAlphabetic AlphanumericAlphanumeric INFORMATIONINFORMATION  Processed andProcessed and meaningful form ofmeaningful form of data is informationdata is information  Reprocessed data toReprocessed data to get more resultsget more results
    • 33 Data ExamplesData Examples  A set of names and addresses written onA set of names and addresses written on student’s admission formstudent’s admission form  A telephone conversation converted toA telephone conversation converted to electrical signals to be sent down theelectrical signals to be sent down the wireswires  A song written in sheet music so that it canA song written in sheet music so that it can be playedbe played
    • 44 Information ProcessingInformation Processing  Is the organization, manipulation and distribution of informationIs the organization, manipulation and distribution of information  Example:Example:  The sorted data for those students in admission form which haveThe sorted data for those students in admission form which have taken computer subject.taken computer subject.  Listening the songsListening the songs  Reading a map from one place to otherReading a map from one place to other  What does the number 29061996 mean?What does the number 29061996 mean?  Is it:Is it:  A birthday? (29A birthday? (29thth June 1996)June 1996)  A bank account number?A bank account number?  A club membership number?A club membership number?  A telephone number?A telephone number?  Without processing or more information this data isWithout processing or more information this data is meaningless.meaningless.
    • 55 Data ProcessingData Processing Input Process Data Collection Output
    • 66 ProcessingProcessing Processing has various operationsProcessing has various operations  CalculationCalculation  AnalysisAnalysis  ComparisonComparison  ManipulationManipulation
    • 77 The three stages of doing tasksThe three stages of doing tasks Input Process Output • Data is put into the information system. (INPUT) • The data is processed. (PROCESS) • Information comes out of the information system. (OUTPUT)
    • 88 Manual information systemsManual information systems  We are all used to using manualWe are all used to using manual information systems.information systems.  An example of a manual informationAn example of a manual information system is a telephone directory.system is a telephone directory.
    • 99 Manual information systemsManual information systems  All we need to know to find a person’sAll we need to know to find a person’s telephone number in the telephonetelephone number in the telephone book is their name and address.book is their name and address. (INPUT)(INPUT)  We look up the name and the addressWe look up the name and the address (PROCESS), and we find their(PROCESS), and we find their telephone number. (OUTPUT)telephone number. (OUTPUT)
    • 1010 Manual information systemsManual information systems Input Process Output • Have the name and address. (INPUT) • Look up the name and address. (PROCESS) • Find the telephone number. (OUTPUT)
    • 1111 Computerised informationComputerised information systemssystems  Computerised information systemsComputerised information systems have several advantages over manualhave several advantages over manual information systems.information systems.  These include:These include:  Greater flexibilityGreater flexibility  SpeedSpeed
    • 1212 Examples of computerisedExamples of computerised information systemsinformation systems  DVLA – Driver Vehicle LicensingDVLA – Driver Vehicle Licensing AuthorityAuthority  The DVLA has a computerisedThe DVLA has a computerised database about every driver anddatabase about every driver and vehicle in the UK.vehicle in the UK.  This database can be used to findThis database can be used to find information about a vehicle or driverinformation about a vehicle or driver even if the data is incomplete.even if the data is incomplete.
    • 1313 Advantages of computerisedAdvantages of computerised information systemsinformation systems  A single computer can store all theA single computer can store all the information needed.information needed.  By using several terminals differentBy using several terminals different people can access information at thepeople can access information at the same time.same time.  Information is not duplicated.Information is not duplicated.  Information can be transferred toInformation can be transferred to other computer systems easily.other computer systems easily.
    • 1414 EncodingEncoding  To convert information or data into a formTo convert information or data into a form ready for processingready for processing Example:Example: Information about products is encodedInformation about products is encoded into bar codes which are then printed oninto bar codes which are then printed on products labels.products labels.
    • 1515 DecodingDecoding  To convert data back to a form where itTo convert data back to a form where it can be understood.can be understood. Example:Example: On a school data file, the names of theOn a school data file, the names of the teachers are stored .teachers are stored .
    • 1616 Data CollectionData Collection  Bringing together all the data for anBringing together all the data for an application and getting it ready forapplication and getting it ready for processing.processing.  In schools there is a admission form thatIn schools there is a admission form that filled completely and send admin back .filled completely and send admin back . Their details are typed into a computer viaTheir details are typed into a computer via a keyboard.a keyboard.
    • 1717 Data CaptureData Capture  Means obtaining data for a ComputerMeans obtaining data for a Computer  Term is used in situations where a computerTerm is used in situations where a computer peripheral inputs the data automatically.peripheral inputs the data automatically. ExampleExample:: In examination candidate does a multiple choiceIn examination candidate does a multiple choice test by making a card with pencil in right places.test by making a card with pencil in right places. The card is read by a mark sensing device.The card is read by a mark sensing device.
    • 1818 Information TechnologyInformation Technology  Uses Computing with high speed communication links toUses Computing with high speed communication links to spread information from one place to other.spread information from one place to other.  All types of equipment or programs that are used inAll types of equipment or programs that are used in processing informationprocessing information  World has become a global villageWorld has become a global village  Information can be communicated in any shape such asInformation can be communicated in any shape such as  PhotographsPhotographs  MoviesMovies  TextText  Digital diagramsDigital diagrams