09.1 types of computer operation
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There are several methods of computer operation including single program mode, multitasking mode, multiuser mode, multiprocessor mode, batch mode, and real time mode. Single program mode runs one program at a time on a computer. Multitasking mode runs two or more programs simultaneously by sharing processor time. Multiuser mode shares processor time between multiple computers. Multiprocessor mode allows processors to work together and share memory. Batch mode groups programs together to run more efficiently. Real time mode is used for systems that require immediate input and output responses.
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The document provides an introduction to operating systems, including definitions, goals, and components. It discusses how operating systems manage computer hardware, execute user programs, and make systems convenient and efficient. It describes how operating systems act as an intermediary between users and hardware. It also summarizes the evolution of operating systems from early batch systems to modern time-sharing and networked systems. Key aspects covered include process management, memory management, multiprocessing, real-time systems, personal computers, and the role of the operating system in enabling interaction between programs and hardware.
Operating Systems & Applications
The document provides an outline on operating systems memory storage and management. It discusses how the OS must manage memory to ensure each process has enough space to execute without interfering with other processes. It describes different types of memory like cache, RAM, and disk and how the OS uses these properly. Specific topics covered include cache memory, RAM, virtual memory using swap files, the kernel, kernel types, shells, types of shells, shell scripting, and the four freedoms of open source software.
Types of Operating System
This document provides an introduction to different types of operating systems, including serial processing systems, batch operating systems, multi-programming systems, time sharing systems, distributed systems, network systems, and real-time systems. It defines each type and provides one or two examples. Serial and batch systems execute jobs sequentially while multi-programming systems allow multiple programs to run simultaneously. Time sharing systems rapidly switch between programs to give the appearance they are running simultaneously. Distributed and network systems connect multiple processors across a network. Real-time systems have strict time constraints and do not tolerate delays.
Operating system concepts
The document discusses operating systems and their key functions. It describes how an operating system acts as an intermediary between the user and computer hardware, managing resources like memory, processors, devices and information. It outlines important operating system functions such as memory management, processor management, device management, file management, security and job accounting. It also discusses different types of operating systems including batch, time-sharing, distributed and network operating systems.
Introduction of os and types
The document provides an overview of operating systems, including what they are, their main objectives and advantages. It discusses the history and evolution of OS, from early systems in the 1950s used for tape storage, to modern operating systems with graphical user interfaces. It also covers different types of OS like batch processing systems, time-sharing systems, personal computer systems, parallel and real-time systems. Key aspects of OS like kernels, memory management and different system architectures are summarized as well.
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14 data logging
This document discusses how data loggers are used to collect weather data for forecasting. It describes how data loggers can acquire data from various sensors like temperature, humidity, wind speed, and rainfall sensors. The data is stored digitally and downloaded to computers for detailed analysis. This automated process avoids human error and allows constant collection of weather measurements. Various sensors are then described, such as temperature sensors that produce digital signals, wind speed sensors that count revolutions, and rainfall detectors that record bucket tips. The collected data is used along with satellite images and weather balloons to improve weather forecasting.
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This document discusses systems analysis and design and the systems development life cycle (SDLC). It describes the four phases of the SDLC as planning, analysis, design, and implementation. It also outlines different SDLC models including the waterfall model, prototype model, and spiral model. It notes the pros and cons of each model and the criteria for selecting the appropriate methodology. Finally, it discusses different roles on an information systems team such as business analyst, database administrator, and systems analyst.
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This document discusses various health issues associated with prolonged computer use and provides guidelines and regulations for ergonomic workplace design. It outlines potential health problems like eyestrain, repetitive strain injury, back pain, and stress. It provides solutions for these issues, such as taking regular breaks, ensuring proper posture, and using adjustable equipment. The document also discusses workplace safety regulations that require employers to assess workstations, provide training, and arrange for eye exams. Overall, it stresses the importance of ergonomic workplace design principles for minimizing health risks from computer use.
Ch 19. social and economic effects of it
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Human: Thank you, that is a concise 3 sentence summary that captures the key points of the document.
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This document discusses various aspects of computer security, including physical security, software security, and data security. It outlines threats like theft, fires, viruses, and disk failure. It recommends measures like locks, alarms, badges, backups, antivirus software, passwords, encryption, and transaction logs to protect hardware, software, data and ensure data integrity. Regular backups stored securely offsite are emphasized to prevent data loss from hardware or software issues.
Ch 15 .networks and communications
A network connects computer systems together to share computing power and storage facilities. Computers connect through cables or phone lines and may be in the same building or across different locations. Common examples include computer networks in offices and the global Internet. Networks allow for sharing of resources like printers and files as well as easy communication. While they provide advantages, networks also involve costs and security risks. The document describes different types of computer networks including LANs, WANs, and MANs as well as various network topologies, hardware, software, and security measures used in computer networking.
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Traditional weather forecasting relied on collecting data from various locations and recording it manually, which risked human error. Now, automated data logging uses sensors to regularly collect weather measurements like temperature, wind, and humidity without human intervention. This data is converted into a digital format and stored to improve accuracy of forecasts. Data logging allows for frequent, round-the-clock collection of weather data from remote locations.
Ch 13 system analysis
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Ch 8 data base
1. A database is an organized collection of related data stored electronically. It allows for efficient storage and retrieval of information.
2. Data is stored in a database in records that contain fields and items. Records contain related data items grouped together, while fields are areas within records reserved for specific data types.
3. There are different types of files like master files, transaction files, and backup files that are used for different purposes in a database system. Master files contain the most complete data while transaction files contain temporary data used to update master files.
Ch 6 collecting your data
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Ch10 data transfer
1. The document discusses various methods of data transfer between software and computers, including file conversion between different versions of software, the use of ASCII codes to represent characters, and common file formats like CSV that allow transfer between programs.
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3. Methods of transferring text files between different word processors by saving everything in ASCII format are described, as well as how comma separated variable files can be read by most spreadsheets and databases.
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09.1 types of computer operation
- 1. Types of computer operation
- 2. Methods of operation • There a several different methods of operation. • Most computers can undertake each of these simultaneously. • These methods of operation are: • Single program mode • Multitasking mode • Multiuser mode • Multiprocessor mode • Batch mode • Real time mode
- 3. Single program mode • Single program mode is where one program is being run on one computer at a particular time.
- 5. Multitasking mode • Multitasking takes place when two or more programs are being run on one computer at the same time. • In order for this to happen, the operating system shares the processor time between the tasks.
- 7. Multiuser mode • Multiusing takes place when two or more computers are being run on the same system at the same time. • The operating system shares the processor time between the computers. • This share of processor time is called a TIME SLICE.
- 9. Multiprocessor mode • In a larger computer system that contains several processors, the multiprocessor mode allows the processors to work together and to share the same memory.
- 11. Batch mode • In larger computer systems it is sometimes more efficient to group together programs (in a BATCH) before they are run through the computer system (e.g. a company payroll). • Whilst the computer system is operating in batch mode, no user input can take place.
- 12. Batch mode
- 13. Real time mode • Real time mode is used in computers that have to react very quickly to inputs that require immediate outputs (e.g. aircraft ‘fly-by-wire’ controls).
- 14. Real time mode