Premium Essay

Smartphones Operating Systems

In: Other Topics

Submitted By eqzooz
Words 15551
Pages 63
Operating system :

An operating system (OS) is a collection of software that manages computer hardware resources and provides common services for computer programs. The operating system is an essential component of the system software in a computer system. Application programs usually require an operating system to function.
Time-sharing operating systems schedule tasks for efficient use of the system and may also include accounting software for cost allocation of processor time, mass storage, printing, and other resources.
For hardware functions such as input and output and memory allocation, the operating system acts as an intermediary between programs and the computer hardware, although the application code is usually executed directly by the hardware and will frequently make a system call to an OS function or be interrupted by it. Operating systems can be found on almost any device that contains a computer—from cellular phones and video game consoles to supercomputers and web servers.
Examples of popular modern operating systems include Android, BSD, iOS, Linux, OS X, QNX, Microsoft Windows, Windows Phone, and IBM z/OS. All these, except Windows, Windows Phone and z/OS, share roots in UNIX.

Smartphone

A Smartphone, or smart phone, is a mobile phone built on a mobile operating system, with more advanced computing capability and connectivity than a feature phone. The first smartphones combined the functions of a personal digital assistant (PDA), including email functionality, with a mobile phone. Later models added the functionality of portable media players, low-end compact digital cameras, pocket video cameras, and GPS navigation units to form one multi-use device. Many modern smartphones also include high-resolution touchscreens and web browsers that display standard web pages as well as mobile-optimized sites. High-speed data access is provided by…...

Similar Documents

Premium Essay

Operating Systems

...Operating systems What an operating system does The operating system is software, an operating system makes a computer come alive. When a computer is first built it is effectively cut-off from the world as it cannot receive input or provide output. Without an operating system a computer cannot work efficiently. The operating system has three main tasks to do:  Manage the computer resources: Input and output functions of the computer are controlled by the operating system. The operating system has to manage the CPU, how memory is allocation , access to disk drives, and many other tasks.  Interact with the user: All computers need someone to interact with it, to control it . It is the operating system's task to provide a means of doing this which is easy, consistent, flexible and structured. An operating system also allows the user of the computer to make changes as well.  Run applications: Application packages, such as word processors or spreadsheets, are what most users use on their computers, for most it is essential for their daily use of computers . The operating system provides a means of executing them, and provides the programs with tools and services. These include commands from retrieving data from a hard disk, or even to send data to a printer. LINUX The history of Linux began in 1991 with the commencement of a personal project by a student who was called Linus Torvalds. He studied at the University or Helsinki and this is where he created......

Words: 293 - Pages: 2

Premium Essay

Operating System

...Khajeh-Hosseini, 2009). As experienced by large or small companies while adopting cloud computing technology, the issues can be outlined as security, privacy, data migration as (Hosseini, et al., 2010 ). Adoption of cloud technology by enterprises especially those are using KBE (knowledge based engineering) systems are in risk in terms of migration their data over the cloud. Most enterprises are in a midst of creating, sharing, streaming and storing data in digital formats to allow collaboration , hence there is a need to continuously managed and protect the data to ensure its value and authenticity (Yale &ump; Chow, 2011). Enterprises now acquire increasingly more information about their products, customers and partners- whether it’s stored in a cloud environment or not and failure to protect this data can be damaging. Partners and clients anticipate their information will be constantly protected before conducting business with a company. Within lay the need for complete data governance to manage and protect crucial data, which has become a key issue for the cloud (Yale, 2011). The literature review aims to address the adoption of cloud computing within enterprises those are using KBE systems and how this adoption of cloud will affect their data governance strategies by drawing findings from different practices and other studies. The report will highlight importance of cloud computing in enterprises and address the state of cloud data governance importance within......

Words: 2090 - Pages: 9

Free Essay

Operating Systems

...Researching operating systems I am choosing Windows XP for the basic low end computer because the system requirements are fairly low and it will work on just about any personal computer that is being used today. The operating system I am choosing for the high end computer is Windows 7. Its requirements are tailor-made more for the newer and higher end computers. Some of the computers that are out there will not be able to run windows 7. Windows XP system requirements are a Pentium 233 megahertz processor, at least 64 megabytes of system memory, at least 1.5 gigabytes of hard disk space, CD-ROM or DVD drive, video adaptor, and a monitor with a screen resolution of 800x600 or higher. Windows XP doesn’t have a very memory intensive graphical user interface either. If you are upgrading from Windows 2000 you probably won’t notice too much of a difference as far as the general look and feel of the operating system. You will have to activate it soon after you install the program to keep it from deactivating. Windows XP also has better security and protection than previous versions. Windows 7 system requirements are 1 gigahertz or faster processor, 1 gigabyte of system memory for 32 bit systems and 2 gigabytes of system memory for 64 bit systems, 16 gigabytes of hard disk space for 32 bit systems and 20 gigabytes of hard disk space for 64 bit systems, support for DirectX 9 with windows display driver model 1.0 and 128 megabytes of memory for the Aero theme desktop, a......

Words: 534 - Pages: 3

Premium Essay

Operating Systems

...MODERN OPERATING SYSTEMS SECOND EDITION by Andrew S. Tanenbaum Publisher: Prentice Hall PTR ISBN 0-13-031358-0, 976 pages Table of Contents About the Author MODERN OPERATING SYSTEMS PREFACE 1 INTRODUCTION 1.1 WHAT IS AN OPERATING SYSTEM? 1.1.1 The Operating System as an Extended Machine 1.1.2 The Operating System as a Resource Manager 1.2 HISTORY OF OPERATING SYSTEMS 1.2.1 The First Generation (1945-55) Vacuum Tubes and Plugboards 1.2.2 The Second Generation (1955-65) Transistors and Batch Systems 1.2.3 The Third Generation (1965-1980) ICs and Multiprogramming 1.2.4 The Fourth Generation (1980-Present) Personal Computers 1.2.5 Ontogeny Recapitulates Phytogeny 1.3 THE OPERATING SYSTEM ZOO 1.3.1 Mainframe Operating Systems 1.3.2 Server Operating Systems 1.3.3 Multiprocessor Operating Systems 1.3.4 Personal Computer Operating Systems 1.3.5 Real-Time Operating Systems 1.3.6 Embedded Operating Systems 1.3.7 Smart Card Operating Systems 1.4 COMPUTER HARDWARE REVIEW 1.4.1 Processors 1.4.2 Memory 1.4.3 I/O Devices 1.4.4 Buses 1.5 OPERATING SYSTEM CONCEPTS 1.5.1 Processes 1.5.3 Memory Management 1.5.4 Input/Output 1.5.5 Files 1.5.6 Security 1.5.8 Recycling of Concepts 1.6 SYSTEM CALLS 1.6.1 System Calls for Process Management 1.6.2 System Calls for File Management 1.6.3 System Calls for Directory Management 1.6.4 Miscellaneous System Calls 1.6.5 The Windows Win32 API 1.7 OPERATING SYSTEM STRUCTURE 1.7.1 Monolithic Systems 1.7.2 Layered Systems 1.7.3 Virtual Machines......

Words: 387392 - Pages: 1550

Premium Essay

Operating System

...------------------------------------------------- BCN 2053 – OPERATING SYSTEMS – Assignment 1 ------------------------------------------------- Top of Form INSTRUCTIONS – Detail instructions is given below, please follow accordingly. This assignment carries a total of 10 marks. When we talk about operating systems, the most popular words are Windows and Linux. This assignment is all about exploring both types of operating systems. Each group require to: 1. Draw and explain in brief the evolution of both operating systems from the beginning up to today. Explanations may include : a. Year of release b. Version release c. Features 2. Compare between this two very popular Operating Systems, Windows VS Linux in terms of : a. Memory management 1. Focus on how both operating systems handle their memory management especially on virtual memory. To support your research, you may include relevant scenario of how memory being access. 2. Explain any limitation of maximum or minimum memory required by each operating systems especially on 64bit or 32bit architecture 3. Compare and recommend which operating systems utilize its memory more efficient in terms of: i. Normal usage (everyday usage by normal user) ii. Server usage (server environment) b. Process management 4. Focus on how both operating systems handle their process management when it comes to many processes request for CPU resources.......

Words: 486 - Pages: 2

Premium Essay

Operating Systems

...DENIS In a multiprogramming and time-sharing environment, several users share the system simultaneously. This situation can result in various security problems. What are two such problems? A time sharing environment or multi programming is one in which a computer system provides direct communication between the user and the system. It allows many users to share the computer at the same time. One of the problems that may result from the fact that resources are being shared is information theft, this is because all the users are able to access the files that are being shared on the system and so one can easily copy a file and modify it without the knowledge of all the other parties. Such scenarios can result into loss of security confidentiality and integrity since the owner of a file Without being aware of the system used as time-sharing and multiprogramming, may insert or have a secret or confidential data that he wants to remain at the file and also other users may change, add, or even remove some information in the file if they want to, since they have access to all files running on the system The other problem resulting from using such systems is the fact that there could be loss of storage space. Since users have equal privileges to create and access files on the system, then there could be a possibility that the users will create numerous files and eat up the storage space on the system without the other users’ knowledge, so as time goes by, each user will......

Words: 1053 - Pages: 5

Premium Essay

Operating Systems

...Operating Systems Christy Kegley IT/282 3/2/2014 Carlton Foster Operating Systems * Provide a brief history of three operating systems. The top three operating systems are; Windows XP, Windows Vista, and Linux. “Windows XP is the first Windows OS to allow multiple users to log on simultaneously to the OS, each with their own applications open. Although Windows XP was first released with some bugs, the second service pack (Service Pack 2) resolved most of these problems. XP underwent three service packs. It is an extremely stable OS and was popular in both the home and corporate markets” (Guide to Managing and Maintaining Your PC, Eighth Edition, Andrews, pg. 1116). This programs allows users to do many things that others might not allow like older versions of Windows. Windows Vista is the newest version of Windows. This program is not very popular with some people because there is a lack of compatibility with other programs, also it slows performance. “The first problem is partly caused by hardware manufacturers not providing Vista drivers for their devices that were originally sold with XP drivers. The second problem means that many low end desktop and laptop computers can’t run Vista. And the slow performance of Vista is partly due to the many unnecessary features (fluff) it offers; these features weigh heavy on system resources. Vista comes in five versions: Windows Vista Home Basic, Home Premium, Business, Enterprise, and Ultimate. (Vista......

Words: 764 - Pages: 4

Premium Essay

Operating System

...time and system configuration settings, needed by the basic input/output system (BIOS) to start the computer. This name is somewhat misleading, however, as most modern computers no longer use CMOS chips for this function, but instead depend on other forms of non-volatile memory. CMOS chips are still found in many other electronic devices, including digital cameras. In a computer, the CMOS controls a variety of functions, including the Power On Self Test (POST). When the computer’s power supply fires up, CMOS runs a series of checks to make sure the system is functioning properly. One of these checks includes counting up random access memory (RAM). This delays boot time, so some people disable this feature in the CMOS settings, opting for a quick boot. If installing new RAM it is better to enable the feature until the RAM has been checked. Ad Once POST has completed, CMOS runs through its other settings. Hard disks and formats are detected, along with Redundant Array of Independent Disk (RAID) configurations, boot preferences, the presence of peripherals, and overclocking tweaks. Many settings can be manually changed within the CMOS configuration screen to improve performance; however, changes should be made by experienced users. Changing settings improperly can make the system unstable, cause crashes, or even prevent the computer from booting. The CMOS configuration screen is accessible during the POST phase of boot up, by pressing a key before the operating system......

Words: 747 - Pages: 3

Premium Essay

To Identify the Top Three Operating Systems for Smartphones and Explain Their Features

...TO IDENTIFY THE TOP THREE OPERATING SYSTEMS FOR SMARTPHONES AND EXPLAIN THEIR FEATURES In this report I want to explain what are the three major smartphone operating systems and their features. The contents of this paper will describe the different design features of Google’s Android, Apple’s iOS and Microsoft’s WindowsPhone operating systems and why the consumers favor them. If you have any questions you can contact me at 409344-0867 or at nuthaky.phani@gmail.com Respectfully yours, Phani Nuthaky TABLE OF CONTENTS Part Page I. INTRODUCING THE REPORT 1 A. What is a smart phone? 1 B. Key smart phone features 1 C. What is a smart phone operating system? 2 II. WHY IS ANDROID THE TOP SMARTPHONE OPERATING SYSTEM? 3 A. What users love in Android? 3 B. Some of the drawbacks of Android 4 III. iOS APPLE’S SMARTPHONE OPERATING SYSTEM 5 A. Features of iOS 5 B. Setbacks of iOS 6 IV. WINDOWS PHONE OPERATING SYSTEM 6 A. Top features of Windows Phone 7 B. Trade offs of Windows Phone 8 IV. SUMMING UP THE SMARTPHONE OS COMPARISON 9 LIST OF ILLUSTRATIONS Graphic Page TABLE 1 Top Smartphone Platforms 11 TO IDENTIFY THE TOP THREE OPERATING SYSTEMS FOR SMARTPHONES AND EXPLAIN THEIR FEATURES I. INTRODUCTION A. What is a smart phone? A smartphone (or smart phone) is a mobile phone......

Words: 2961 - Pages: 12

Premium Essay

Operating System

...data and interacts. But most importantly, the Operating System has a huge impact on any type of PC and smartphones. According to (Capron, 2001), “An Operating System is the fundamental software that has the access to control all other software and hardware resources” (p. 65). It has control of every file, processes, session of memory and device. (Nickerson, 2001) stated, “The most centralized system software is the OS. Without it, PCs would be extremely hard to utilize.” (p. 31). It is specially designed to work for different types of computers. For example: desktop computer, laptop, tablet PC, handheld PC, etc. Generally, a personal computer (PC) is all-purpose computer. The size and the capabilities make it convenient for individuals, and which is intended to be operated directly by an end user. The different types of operating systems are, Windows, Linux, Mac OS, etc. and each of them have different versions. These advances in hardware and software technologies have increased demands for more advanced and better operating systems. Now, compatible companies such as Windows and Apple are coming up with newer generations in the OS field which performs more complex tasks compare to their previous generations. Operating systems have evolved through various stages and generations. Looking back into the history of OS, the first generations came out in the year 1940’s. The first electronic digital computer didn't have any operating systems or programming languages at that time,......

Words: 1560 - Pages: 7

Free Essay

Operating Systems

...Operating Systems Vulnerabilities NAME POS 355 18 Mar 15 Carol Eichling Operating Systems Vulnerabilities As the reported number of security vulnerabilities continued to spike in the 20th century let us define a security flaw. A security flaw according to "Apple Security Flaw: What You Need To Know" (2014), "The flaw is in the way the operating system provides the essential services, known as secure sockets layer (SSL) or transport layer security (TLS). These two layers of security allow information to be transmitted worry-free between browsers and web servers, or between a mail server and mail client. SSL is in the form of encryption, which scrambles data sent over a network to keep it private. The second layer involves verification that the server is authentic." With the heighten computer security regarding vulnerabilities, the increase of user awareness and training users to not click on particular links is difficult yet feasible. Although most operating system has computer security protection, the tasks of protecting the systems from vulnerabilities are a daunting task because the operating systems are unique. Security flaw in Microsoft and Mac OS X® A known security flaw in Windows is called the Freak. The Freak security flaw allowed hackers to create a simulated middle person attacks on the encrypted secure sockets layer and transport layer of a security connections. It was discovered that hackers could force websites to weaken the system......

Words: 843 - Pages: 4

Premium Essay

Operating Systems

...NT1110_StudentName_Module1_Lab.doc 3/21/15 An operating system takes input in the form of zeros and ones -- bits -- and runs them through various circuits and processors, the hardware behaves according to built in rules. We define these rules using gates, which take input and produce an output in a structured way. The operating system allows complex programs to access hardware to get results. Only the hardware's physical properties can limit what programs can do. You could design an operating system by physically programming it into a computer's circuits. This would require building electrical pathways using millions of gates. But such an operating system would be slow and you would need the patience of Jonah to use it. That's why operating systems like Mac OS X and Windows are software. Software is flexible and hardware is not -- you can make changes to software with updates. To do the same with hardware would mean switching out physical chips and circuit boards. Operating systems are like the manager for a computer, it’s the job of the OS to monitor what software needs and what the hardware can provide. When you run applications on your computer, the OS allocates the resources necessary to complete the task. That can include processing power, memory and computer storage access, among other things. Ideally the OS will make sure that your computer's hardware is never overtaxed. ...

Words: 705 - Pages: 3

Free Essay

Operating Systems

... ZETECH UNIVERSITY NAME: RUTERE JOAN WANJA REG. NO: DBIT-02-0035/2015 SCHOOL: I.T COURSE: DBIT UNIT NAME: OPERATING SYSTEMS TASK: CAT 2 LECTURER: MR FRED 1. Context Switching It is the process of storing of storing and restoring the state (context) of a process or thread so that the execution can be resumed from the same point at a later time. There are three potential triggers for a context switch: • Multitasking: Most commonly, within some scheduling scheme, one process needs to be switched out of the CPU so another process can run.This context switch can be triggered by the process making itself unrunnable, such as by waiting for an I/O or synchronization operation to complete. On a pre-emptive multitasking system, the scheduler may also switch out processes from being starved of CPU time, preemptive schedulers often configure a timer interrupt to fire when a process exceeds its time slice.This interrupt ensures that the scheduler will gain control to perform a context switch. • Interrupt Handling Modern architectures are interrupt driven.This means that if the CPU requests data from a disk, for example, it does not need to busy-wait until the read is over, it can issue the request and continue with some other execution. When the read is over, the CPU can be interrupted and presented with the read. For interrupts, a program called an interrupt handler that handles the interrupt from the disk. When an interrupt...

Words: 991 - Pages: 4

Premium Essay

Analysis of the Smartphone as a System

... Analysis of the smartphone as a system using knowledge on methods of System Analysis Smartphone A smartphone or smart phone is a mobile phone with an advanced mobile operating system which combines features of a personal computer operating system with other features useful for mobile or handheld use. In addition to a Smartphone’s communication functions, it can: * Send emails. * Use GPS to locate an address and keep you from getting lost. * Enable installation of other programs. * Allow any interface for data entry. * Manage digital agenda and contacts. * Display documents in various formats. * Allow Internet access. * Utilize an operating system. * Require permission to install third party programs. * Make, edit and store videos and photos. * Function as an mp3 player To access these benefits, the devices must have an operating system such as Microsoft Mobile 6.0, BlackBerry RIM, Palm OS and OS X, to name a few. For example, you can watch a video while you answer a call. The Smartphone's main function is to perform more than one activity at a time. Smartphone is a system which generally consists of hardware and software. Hardware Hardware is best described as any physical component of a computer system that contains a circuit board, ICs, or other electronics. Without any hardware, your computer/smartphone would not exist, and software could not be used. Smartphones run on processors. Along with processors, smartphones also have computer......

Words: 592 - Pages: 3

Premium Essay

Operating System

...Intercontinental University * Leonel A Silvestre * ITCO211 * File System Hi As your help desk technician I will do everything we can to help you with the operating system problem. Everybody knows what is a Hard Disk or Hard Drive let me refresh your mind, with a simple explanation: Hard Disk/ Drive, is a device for storing and retrieving digital information, primarily computer data. It consists of one or more rigid rapidly rotating discs (platters) coated with magnetic material, and with magnetic heads arranged to write data to the surfaces and read it from them. With that been said, now move forward with Operating System and Hard Disk/ Drive. I would like to recommend you the best operating system is DOS (Disk Operating System), why? Because has everything you need. Let me tell you a little more about DOS. Disk Operating System: Most often abbreviated as DOS, refer to operating system software used in most computers that provides the abstraction and management of secondary storage devices and the information on them (e.g., file systems for organizing files of all sorts). Such software is referred to as a disk operating system when the storage devices it manages are made of rotating platters, such as floppy disks or hard disks. In the early days of microcomputers, computer memory space was often limited, so the disk operating system was an extension of the operating system. This component was only loaded if needed. Otherwise, disk access......

Words: 1780 - Pages: 8