Computing in the modern world

The Ishango bone Devices have been used to aid computation for thousands of years, mostly using one-to-one correspondence with fingers. The earliest counting device was probably a form of tally stick. Later record keeping aids throughout the Fertile Crescent included calculi clay spheres, cones, etc.

Computing in the modern world

Sir William Thomson 's third tide-predicting machine design, —81 In the first half of the 20th century, analog computers were considered by many to be the future of computing.

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These devices used the continuously changeable aspects of physical phenomena such as electricalmechanicalor hydraulic quantities to model the problem being solved, in contrast to digital computers that represented varying quantities symbolically, as their numerical values change.

As an analog computer does not use discrete values, but rather continuous values, processes cannot be reliably repeated with exact equivalence, as they can with Turing machines.

It used a system of pulleys and wires to automatically calculate predicted tide levels for a set period at a particular location and was of great utility to navigation in shallow waters. His device was the foundation for further developments in analog computing.

He explored the possible construction of such calculators, but Computing in the modern world stymied by the limited output torque of the ball-and-disk integrators. The lever just in front of the bomb aimer's fingertips sets the altitude, the wheels near his knuckles set the wind and airspeed.

An important advance in analog computing was the development of the first fire-control systems for long range ship gunlaying. When gunnery ranges increased dramatically in the late 19th century it was no longer a simple matter of calculating the proper aim point, given the flight times of the shells.

Various spotters on board the ship would relay distance measures and observations to a central plotting station. There the fire direction teams fed in the location, speed and direction of the ship and its target, as well as various adjustments for Coriolis effectweather effects on the air, and other adjustments; the computer would then output a firing solution, which would be fed to the turrets for laying.

Computing in the modern world

InBritish engineer Arthur Pollen developed the first electrically powered mechanical analogue computer called at the time the Argo Clock. Mechanical devices were also used to aid the accuracy of aerial bombing. Drift Sight was the first such aid, developed by Harry Wimperis in for the Royal Naval Air Service ; it measured the wind speed from the air, and used that measurement to calculate the wind's effects on the trajectory of the bombs.

The art of mechanical analog computing reached its zenith with the differential analyzer[49] built by H.

A dozen of these devices were built before their obsolescence became obvious; the most powerful was constructed at the University of Pennsylvania 's Moore School of Electrical Engineeringwhere the ENIAC was built.

Advent of the digital computer[ edit ] The principle of the modern computer was first described by computer scientist Alan Turingwho set out the idea in his seminal paper, [53] On Computable Numbers. He proved that some such machine would be capable of performing any conceivable mathematical computation if it were representable as an algorithm.

He went on to prove that there was no solution to the Entscheidungsproblem by first showing that the halting problem for Turing machines is undecidable: He also introduced the notion of a 'Universal Machine' now known as a Universal Turing machinewith the idea that such a machine could perform the tasks of any other machine, or in other words, it is provably capable of computing anything that is computable by executing a program stored on tape, allowing the machine to be programmable.

Von Neumann acknowledged that the central concept of the modern computer was due to this paper. Except for the limitations imposed by their finite memory stores, modern computers are said to be Turing-completewhich is to say, they have algorithm execution capability equivalent to a universal Turing machine.

Electromechanical computers[ edit ] The era of modern computing began with a flurry of development before and during World War II. Most digital computers built in this period were electromechanical — electric switches drove mechanical relays to perform the calculation.

These devices had a low operating speed and were eventually superseded by much faster all-electric computers, originally using vacuum tubes. The Z2 was one of the earliest examples of an electromechanical relay computerand was created by German engineer Konrad Zuse in It was an improvement on his earlier Z1 ; although it used the same mechanical memoryit replaced the arithmetic and control logic with electrical relay circuits.

It was a substantial development from a device that had been designed in by Polish Cipher Bureau cryptologist Marian Rejewskiand known as the " cryptologic bomb " Polish: InZuse followed his earlier machine up with the Z3[58] the world's first working electromechanical programmablefully automatic digital computer.

It was quite similar to modern machines in some respects, pioneering numerous advances such as floating point numbers. Replacement of the hard-to-implement decimal system used in Charles Babbage 's earlier design by the simpler binary system meant that Zuse's machines were easier to build and potentially more reliable, given the technologies available at that time.

In two patent applications, Zuse also anticipated that machine instructions could be stored in the same storage used for data—the key insight of what became known as the von Neumann architecturefirst implemented in Britain in the Manchester Baby of Apparently his work remained largely unknown to engineers in the UK and US until much later, although at least IBM was aware of it as it financed his post-war startup company in in return for an option on Zuse's patents.

Inthe Harvard Mark I was constructed at IBM's Endicott laboratories; [63] it was a similar general purpose electro-mechanical computer to the Z3, but was not quite Turing-complete. Digital computation[ edit ] The term digital was first suggested by George Robert Stibitz and refers to where a signal, such as a voltage, is not used to directly represent a value as it would be in an analog computerbut to encode it.Computing and data processing within the confines of a data center or office is easy.

You can generally count on good connectivity and a steady supply of electricity, and you have access to as much on-premises or cloud-based storage and compute power as you need.

The situation is much different out in the real world. Learn computing modern world computer with free interactive flashcards. Choose from different sets of computing modern world computer flashcards on Quizlet. Computing in the Modern World.

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Computing in the modern world

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The History of Computing