HISTORY OF OPERATIMG SYSTEMS Operating systems (OS) provide a set of functions needed and used by most application programs on a computer‚ and the linkages needed to control and synchronize computer hardware. On the first computers‚ with no operating system‚ every program needed the full hardware specification to run correctly and perform standard tasks‚ and its own drivers for peripheral devices like printers and punched paper card readers. The growing complexity of hardware and application programs
Premium Operating system Microsoft Windows
A mobile operating system (mobile OS) is an OS built exclusively for a mobile device‚ such as a smartphone‚ personal digital assistant (PDA)‚ tablet or other embedded mobile OS. Popular mobile operating systems are Android‚ iOS and Windows Phone. A mobile OS is responsible for identifying and defining mobile device features and functions‚ including keypads‚ application synchronization‚ email and text messaging. Android OS is owned by Google and powered by the Linux kernel‚ it debuted in 2007.
Premium Smartphone Windows Mobile Mobile operating system
EVOLUTION OF THE OPERATING SYSTEM Operating systems as they are known today trace their lineage to the first distinctions between hardware and software. The first digital computers of the 1940s had no concept of abstraction; their operators inputted machine code directly to the machines they were working on. As computers evolved in the 1950s and 1960s however‚ the distinction between hardware such as the CPU and memory (or Core as it was called then) and the software that was written on top of it
Free Operating system Personal computer Computer
Pinkerton security guard firm in the late 1980s Provide executive summary & detailed analysis of value of acquisition Email your group’s bid to GSI before 6 p.m. evening before discussion Be prepared to discuss the case in class (your answers‚ your analysis‚ etc.) 1 Valuation - Use NPV approach How to make investment decisions: 1. Estimate (expected) cash flows in each time period 2. Choose an appropriate discount rate 3. Use discounted cash flow analysis to calculate NPV
Premium Free cash flow Discounted cash flow Net present value
The Carbon Cycle The element Carbon is the principle block for the organic compounds that make up life. This is because the study of the Carbon Cycle draws upon theories from biology‚ chemistry‚ geology and oceanography in order to understand the movement of carbon throughout the atmosphere‚ hydrosphere‚ and geosphere. Carbon is made up of four electrons that are able to form with each other; this causes the many different forms of carbon. The most popular form of carbon is carbon dioxide; this
Premium Carbon dioxide Fossil fuel Carbon
the UNIX system was its portability‚ permitting it to move from one brand of computer to another with a minimum of code changes. At a time when different computer lines of the same vendor didn’t talk to each other -- yet alone machines of multiple vendors -- that meant a great savings in both hardware and software upgrades. It also meant that the operating system could be upgraded without having all the customer’s data inputted again. And new versions of UNIX were backward compatible with older versions
Premium Unix Operating system Linux
History of Operating Systems Early computers lacked any form of operating system. The user had sole use of the machine; he would arrive at the machine armed with his program and data‚ often on punched paper tape. The program would be loaded into the machine‚ and the machine set to work‚ until the program stopped‚ or maybe more likely‚ crashed. Programs could generally be debugged via a front panel using switches and lights; it is said that Alan Turing was a master of this on the early Manchester
Premium Computer Computer program Operating system
Summary of the Article‚ ”Why do firms exist”……….. Ronald Coase may not be as famous as other economists due to his non-recognisable status but at the turn of the century ‚ he was able to achieve a recognisable status by applying practical theories on pre- existing economic theories. Highlights Deregulation revolution of 1980s Re-surfacing the pin factory which was the foundation of division of labour criticism of earlier economics theories of Adam Smith and others. Bureacracy in modern
Premium Economics
References: 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. Wikipedia Official website of Android Official website of Apple Official website of Windows phone http://www.studymode.com/essays/Mobile-Operating-Systems-FeatureComparison-905694.html http://en.wikipedia.org/wiki/Mobile_operating_system http://archive.techtree.com/techtree/jsp/article.jsp?article_id=114322&cat_id=899 http://jaxov.com/2010/04/iphone-os-4-vs-windows-phone-7-vs-android-2-1comparison/
Premium Smartphone Google Windows Mobile
ELM PYTHON Chapter 4 1. “reject the shell is like rejecting all gears except first in your car” – explain . (gear in the car is use to adjust its speed ‚ same as the shell in the operating system we cannot interact with the kernel and do something to the settings without it) 2. What is the use of options in the command?( Options determine how the command operates) 3. What is the use of arguments in the command?( arguments determine what it operates on) 4. Who develop “bourne shell”?( Stephen
Premium Unix Operating system