ITD13703 Principles of Information Technology - Introduction to Information Technology Notes

1. Fundamental Concepts of Information and Information Technology

• Definition of Data: Data consists of raw inputs supplied to a system. These inputs can take several forms, including:

  • Audio signals.

  • Alphanumeric characters.

  • Images.

• Definition of Information: Information refers to data that has been organized and processed to make it valuable to a user.

• Information Transformation Process: The process of converting data into information involves several discrete steps:

  1. Select Data: Identifying and gathering specific data points (e.g., city names like Johor, KL, or Kelantan).

  2. Organize and Manipulate: Sorting and calculating the data (e.g., counting the instances: $1$ Johor, $2$ KL, $1$ Kelantan).

  3. Produce Information: Presenting the final result (e.g., a report titled "Total city of origin").

• Information Technology (IT): IT encompasses any technologies utilized to capture, process, exchange, store, and/or present valuable information. This is achieved through the use of electrical, magnetic, and/or electromagnetic energy.

The Components and Mechanics of Computer-Based Information Systems (CBIS)

• Definition of CBIS: A Computer-Based Information System is a cohesive set of hardware, software, databases, networks, people, and procedures. These elements work together to collect (input), manipulate (process), store, and process data into information to attain a specific goal.

• Operational Stages of CBIS:

  • Capture: Taking in information. For instance, a Web designer captures multimedia information in HTML format.

  • Process: Executing operations on data. For example, a Web server processes information related to reservations or financial transactions.

  • Exchange: Transmitting information across systems. This occurs when information is sent from a Web server over the Internet to a wireless access point and eventually to a Wi-Fi enabled laptop.

  • Store: Maintaining information for future use. The Web server acts as a storage unit for information content.

  • Present: Delivering information to the end-user. This is typically achieved via a Web browser on a device like a laptop.

The Historical Evolution of Computing Technology

• Early Devices (Abacus and Mechanical Era):

  • The Abacus, created approximately $4000$ years ago, served as the first tool for arithmetic calculations.

  • In the $1600s$, mechanical gears replaced beads for mathematical calculations.

• Electronic Beginnings ($1930s$):

  • The transition from mechanical parts to electrical circuits allowed for the birth of electronic computing.

• $1st$ Generation Computing ($1946$ – $1958$):

  • Featured vacuum tubes and punch cards.

  • Characteristics: Extremely large physical size, slow processing speeds, and high costs.

  • Key Examples: ENIAC and UNIVAC I.

  • Functionality: They operated by following instructions to accept data, process it, and produce information.

• $2nd$ and $3rd$ Generation Computing ($1959$ – $1970$):

  • $2nd$ Generation: Utilized transistors, which made machines faster and smaller.

  • $3rd$ Generation: Introduced Integrated Circuits (ICs) and high-level programming languages.

• $4th$ Generation Computing ($1971$ – $1980$):

  • Employed Very Large Scale Integration (VLSI) chips containing millions of transistors.

  • Characteristics: Compact, affordable, and supported advanced languages like C and C++.

• $5th$ Generation Computing ($1980$ – Present):

  • Focuses on microprocessors, Artificial Intelligence (AI), and Ultra Large Scale Integration (ULSI) technology.

  • Common Form Factors: Desktops, laptops, and ultrabooks.

The Historical Evolution of Telecommunication and Mobile Devices

• Early Development ($1870s$):

  • Telephony originated from harmonic telegraphs using metallic reeds.

  • This enabled real-time voice transmission and reception for the first time.

• Mobile Phone Era ($1970s$):

  • The introduction of the first mobile phone enabled portable voice communication.

• Smartphone Breakthrough ($1990s$ – $2010s$):

  • Touchscreen smartphones emerged featuring email, GPS, cameras, and $3G$ connectivity.

  • Technology later improved with $4G$, mobile gaming, and expanded media access.

• Modern Usage ($2019$ – Present):

  • $5G$ was introduced to provide faster connectivity.

  • Smartphones currently dominate global communication, integrated with AI and internet access, serving over $7.2$ billion users.

  • Function: Converts sound into information to allow two-way communication over a network in real time.

Software Classification and Management

• System Software: Operates as a program that runs the computer and acts as an interface between users, applications, and hardware.

  • Responsibilities: Manages operations such as system startup, memory allocation, and file control.

  • Customization: Tailored to specific hardware based on system requirements and capabilities.

  • Examples: Windows (including features like touch input and OneDrive), macOS, Linux, and Chrome OS.

• Application Software: Assists users in performing specific tasks to improve productivity.

  • Task Examples: Document editing, data analysis, and multimedia creation.

  • Availability: Offered in various formats for personal uses, workgroups, or enterprise-wide deployment.

  • Examples: Microsoft Office, Google Apps, Apple iWork, and Apache OpenOffice.

Principles of Database Systems

• Definition: A database is an organized collection of data files that allow for easy access, sorting, retrieval, and reporting.

• Structure: Data files consist of records and fields.

• Models:

  • Relational Database: Organized into rows and columns.

  • Object-Oriented Database.

  • Multidimensional Database: Used in data warehouses.

• Benefits: Databases reduce data redundancy, enhance data integrity, and accelerate data processing and application development.

• Standard Tools: SQL, MySQL, Microsoft Access, and Oracle.

Network Communication, the Internet, and Cyberspace

• Network: A group of connected computers or devices that enable electronic communication ranging from a single room to a global scale.

• Internet: This connects thousands of smaller networks (educational, business, military, etc.). Originally used for sharing text and numeric data, it now supports multimedia such as video and audio.

• Email:

  • Introduced in $1971$; early users were military-based.

  • Popularized in the $1990s$ through services like Lotus Notes, Hotmail, Yahoo! Mail, and Gmail.

  • Reached over $10$ million users by $1997$ and remains vital for business communication.

• Cyberspace: A term coined by William Gibson in the $1984$ novel Neuromancer. It describes a virtual environment where digital communication occurs.

  • Examples: Messaging apps (WhatsApp), video tools (Zoom), and platforms (YouTube, Netflix).

• World Wide Web (WWW): An interconnected system of servers hosting multimedia documents. It uses web servers to store and deliver content over the internet, serving as a critical component for internet expansion.

• Internet of Things (IoT): A network of physical objects (devices, sensors, machines) embedded with technology for communication.

  • Applications: Manufacturing, energy, and healthcare.

  • Mechanism: Enables machine-to-machine (M2M) interaction and automation.

The Role of Information Technology in Society and Business

• IT in Personal Life:

  • Personal Communication: Telephone/cell phone conversations, Messaging (Email, SMS), and Video Communication.

  • Entertainment: Web surfing, downloading video/audio files, and interactive gaming.

  • Day-to-Day Living: Buying airline tickets, ordering books, electronic banking, and monitoring the stock market.

  • Education: Essential on college campuses for teaching, labs, and course management. Classes are often conducted online or via class websites.

• IT in Business:

  • Internal Communication: Computer networks, corporate websites, video teleconferencing, and messaging systems (SMS, email).

  • Electronic Commerce: Call centers, electronic transactions, and online sales.

  • Business Operations: Factory operation systems and database management.

Computer Technology Characteristics and Impact

• Utility: A computer is a programmable machine that processes raw data into usable information to improve productivity. It includes input/output devices, system storage, storage media, and communication tools.

• Advantages of IT:

  • Speed.

  • Reliability.

  • Accuracy and Consistency.

  • Storage capacity.

  • Superior Communications.

• Disadvantages and Risks of IT:

  • Impact on the labor force.

  • Violation of privacy.

  • Health risks.

  • Environmental impact.

  • Technological dependency.

Professional Careers in Information Technology

• IT Analyst.

• Information Security.

• Network Administration.

• Management Consultant.

• Database Administration: Responsible for managing corporate databases.

• Computer Forensics Expert.

• IT Sales.

• Software Developer.

Green Computing and Environmental Sustainability

• Definition: Green Computing involves reducing electricity usage and environmental waste generated from technologies.

• Advantages and Goals:

  • Decrease the use of hazardous materials.

  • Cut power-related expenses.

  • Support the safe disposal of IT equipment.

  • Lower overall costs throughout the lifecycle of a machine.

  • Enhance corporate public image and ensure employee safety.