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• Over 50 courses will be concurrently running on Coursera on Monday. This is the largest number of courses we’ve ever had running, and we’ll continue to add more throughout the year!

Courses

Calculus: Single Variable University of Pennsylvania 7 January 2013 13 weeks	Analytic Combinatorics, Part I Princeton University February 2013 5 weeks	Introductory Human Physiology Duke University 23 January 2013 12 weeks	Data Analysis Johns Hopkins University 22 January 2013 8 weeks
Clinical Problem Solving University of California, San Francisco 28 January 2013 6 weeks	Nutrition for Health Promotion and Disease Prevention University of California, San Francisco January 2013 6 weeks	Contraception: Choices, Culture and Consequences University of California, San Francisco January 2013 5 weeks	Aboriginal Worldviews and Education University of Toronto 25 February 2013 4 weeks
Health for All Through Primary Care Johns Hopkins University January 2013 5 weeks	An Introduction to the U.S. Food System: Perspectives from Public Health Johns Hopkins University January 2013 6 weeks	The Social Context of Mental Health and Illness University of Toronto 28, January 2013 6 weeks	Galaxies and Cosmology California Institute of Technology 7 January 2013 9 weeks
Principles of Economics for Scientists California Institute of Technology 7 January 2013 10 weeks	Artificial Intelligence Planning University of Edinburgh 28 January 2013 5 weeks	Astrobiology and the Search for Extraterrestrial Life University of Edinburgh 28 January 2013 5 weeks	Introduction to Computer Networks University of Washington 28 January 2013 10 weeks
Introduction to Philosophy University of Edinburgh 28 January 2013 7 weeks	Critical Thinking in Global Challenges University of Edinburgh 28 January 2013 5 weeks	E-learning and Digital Cultures University of Edinburgh 28 January 2013 5 weeks	Programming Languages University of Washington January 2013 10 weeks
Digital Signal Processing École Polytechnique Fédérale de Lausanne February 2013 8 weeks	Grow to Greatness: Smart Growth for Private Businesses, Part I University of Virginia 28 January 2013 5 weeks	Image and video processing: From Mars to Hollywood with a stop at the hospital Duke University 14 January, 2013 9 weeks

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Operating System:

Operating System:

System view: From the computer's point of view the operating system is the program most intimately involved with the hardware . In this context we can view an operating system as a Resource allocator.

A computer system has many resources that may be required to solve a problem. Example: the cpu time, memory space, file storage space, input output devices and so on. The operating system acts as the manager of these resources facing numerous and possibly conflicting requests for resources. The operating system must decide how to allocate these to specific programs and user , so that it can operate the computer system efficiently and fairly.

A slightly different view of an operating system emphasize the need to control the various input output devices and user programs.

An operating system is a control program. A control program manages the execution of user' s programs. It is specially concerned with the operation and control of input output devices.

Computer System Architecture:

Single processor systems: On a single processor system there is one main cpu is capable executing a general purpose instructions set, involving instructions from the user's processes. All of these processors runs a limited instructions set and sometimes they are managed by the operating system. In that the operating system sends them information about their next task and monitors their status.