data structure & file systems hun myoung park, ph.d., public management and policy analysis...
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Data Structure & File Systems
Hun Myoung Park, Ph.D.,
Public Management and Policy Analysis ProgramGraduate School of International Relations
International University of Japan
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OutlineTraditional Data ApproachDatabase ApproachDatabase Schema
External SchemaConceptual Schema Internal Schema
Relational DatabaseRelations and Primary KeyDatabase Management Systems
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Information Systems
“A set of interrelated components that collect, manipulate, store, and disseminate data and information.”
Manual information systems Computerized information systems
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Components of IS 1
Technological components: hardware, software, and telecommunication
Organizational components: data/information, people, rules/procedures
An information system is not simply a set of computer hardware (physical equipment) and software
Telecommunications (Network): connectivity
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Components of IS 2
Data and information (database) are essential since an information system is all about data and information.
People operate and use the systemsProcedures/rules to use systems and
perform tasks. Formal and informal
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Basic Functions of IS
Input gathers and captures raw dataProcess converts or transforms data into
useful output (information)Output produces documents or reports of
what was processedFeedback is information from the system
and is used to make changes to input or process in the system
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Data versus Information
Data: raw factsInformation: facts organized and processed
to have specific meaning and values
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Type of Data
Text data: letters, numbers, and other characters
Image data: graphic images and picturesAudio data: sounds (music & speech) and
noiseVideo data: moving images and pictures
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Valuable Information
“To deliver the right information to the right person at the right time” (p.3)
Accurate, relevant, and complete Reliable and verifiable Timely and accessible (the right format) Simple (Well organized)Flexible and secureEconomical (Table 1.2 in p. 7)
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Five Basic Units 1
Input, output, control, ALU, and memoryInput unit reads data for processingOutput unit displays processed dataControl unit decodes instructions
coordinate flow of data in and out of ALU, register, memory, etc.
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Five Basic Units 2
ALU (arithmetic and logic unit) processes data
Memory unit : primary (volatile) and secondary (nonvolatile) memory to store data and information
* System unit = Control + ALU+ Memory
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Specific Information SystemsElectronic government, M-governmentElectronic commerce, M-commerceTransaction processing systems (TPS)Enterprise resource planning (ERP)Management information systems (MIS), PMISDecision support systems (DSS)Knowledge management systems (KMS)Artificial intelligence, expert systems
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Major Trends in IS 1
Interactivity (Web 2.0) allows users to get an immediate responses
Connectivity connects computers, telephones, and other electronic devices.
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Major Trends in IS 2Digital convergence means technological
merger of several industries through various devices that exchange information in the digital format used in computers.
“The same information may be exchanged among many kinds of equipment, using the language of computers” (Hutchinson & Sawyer: 2000:1.24)
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Major Trends in IS 3Software dominates hardwareNetwork based computing (cloud
computing)
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Why Publicness?
Environmental factorsLegal constraintsPolitical influence Scrutiny Complexity of objectives (ambiguous goals)Fewer incentives for performanceAll these make difference
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Public Information Systems
More emphasis on openness, accountability, representativeness, equity
More limited by environments (politics)External & vertical linkagesSupport a variety of people without
discrimination (no digital inequality)Incremental approach (Bozeman and
Bretschneider, 1986)
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