ASIMO, a humanoid robot manufactured by Honda

A Pick and Place robot in a factory

A robot is an artificial agent. In practice, it is usually an electro-mechanical system which, by its appearance or movements, conveys a sense that it has intent or agency of its own. The word robot can refer to both physical robots and virtual software agents, but the latter are usually referred to as bots.¹ There is no consensus on which machines qualify as robots, but there is general agreement among experts and the public that robots tend to do some or all of the following: move around, operate a mechanical arm, sense and manipulate their environment, and exhibit intelligent behavior, especially behavior which mimics humans or other animals.

Stories of artificial helpers and companions and attempts to create them have a long history, but fully autonomous machines only appeared in the 20th century. The first digitally operated and programmable robot, the Unimate, was installed in 1961 to lift hot pieces of metal from a die casting machine and stack them. Today, commercial and industrial robots are in widespread use performing jobs more cheaply or with greater accuracy and reliability than humans. They are also employed for jobs which are too dirty, dangerous or dull to be suitable for humans. Robots are widely used in manufacturing, assembly and packing, transport, earth and space exploration, surgery, weaponry, laboratory research, and mass production of consumer and industrial goods.²

People have a generally positive perception of the robots they actually encounter. Domestic robots for cleaning and maintenance are increasingly common in and around homes. There is anxiety, however, over the economic impact of automation and the threat of robotic weaponry, anxiety which is not helped by the many villainous, intelligent, acrobatic robots in popular entertainment. Compared with their fictional counterparts, real robots are still benign, dim-witted and clumsy.

Defining characteristics

KITT is mentally anthropomorphic, while ASIMO is physically anthropomorphic

While there is no single correct definition of "robot",³ a typical robot will have several or possibly all of the following properties.

• It is artificially created.
• It can sense its environment, and manipulate or interact with things in it.
• It has some ability to make choices based on the environment, often using automatic control or a preprogrammed sequence.
• It is programmable.
• It moves with one or more axes of rotation or translation.
• It makes dexterous coordinated movements.
• It moves without direct human intervention.
• It appears to have intent or agency.

The last property, the appearance of agency, is important when people are considering whether to call a machine a robot, or just a machine. (See anthropomorphism for examples of ascribing intent to inanimate objects.)

Mental agency
For robotic engineers, the physical appearance of a machine is less important than the way its actions are controlled. The more the control system seems to have agency of its own, the more likely the machine is to be called a robot. An important feature of agency is the ability to make choices.

• A clockwork car is never considered a robot.
• A remotely operated vehicle is sometimes considered a robot (or telerobot).⁴
• A car with an onboard computer, like Bigtrak, which could drive in a programmable sequence, might be called a robot.
• A self-controlled car which could sense its environment and make driving decisions based on this information, such as the 1990s driverless cars of Ernst Dickmanns or the entries in the DARPA Grand Challenge, would quite likely be called a robot.
• A sentient car, like the fictional KITT, which can make decisions, navigate freely and converse fluently with a human, is usually considered a robot.

Physical agency
However, for many laymen, if a machine appears to be able to control its arms or limbs, and especially if it appears anthropomorphic or zoomorphic (e.g. ASIMO or Aibo), it would be called a robot.

• A player piano is rarely characterized as a robot.⁵
• A CNC milling machine is very occasionally characterized as a robot.
• A factory automation arm is almost always characterized as an industrial robot.
• An autonomous wheeled or tracked device, such as a self-guided rover or self-guided vehicle, is almost always characterized as a mobile robot or service robot.
• A zoomorphic mechanical toy, like Roboraptor, is usually characterized as a robot.⁶
• A mechanical humanoid, like ASIMO, is almost always characterized as a robot, usually as a service robot.

Even for a 3-axis CNC milling machine using the same control system as a robot arm, it is the arm which is almost always called a robot, while the CNC machine is usually just a machine. Having eyes can also make a difference in whether a machine is called a robot, since humans instinctively connect eyes with sentience. However, simply being anthropomorphic is not a sufficient criterion for something to be called a robot. A robot must do something; an inanimate object shaped like ASIMO would not be considered a robot.

Definitions

A laparoscopic robotic surgery machine

It is difficult to compare numbers of robots in different countries, since there are different definitions of what a "robot" is. The International Organization for Standardization gives a definition of robot in ISO 8373: "an automatically controlled, reprogrammable, multipurpose, manipulator programmable in three or more axes, which may be either fixed in place or mobile for use in industrial automation applications."⁷ This definition is used by the International Federation of Robotics, the European Robotics Research Network (EURON), and many national standards committees.⁸

The Robotics Institute of America (RIA) uses a broader definition: a robot is a "re-programmable multi-functional manipulator designed to move materials, parts, tools, or specialized devices through variable programmed motions for the performance of a variety of tasks".⁹ The RIA subdivides robots into four classes: devices that manipulate objects with manual control, automated devices that manipulate objects with predetermined cycles, programmable and servo-controlled robots with continuous point-to-point trajectories, and robots of this last type which also acquire information from the environment and move intelligently in response.

There is no one definition of robot which satisfies everyone, and many people have their own.¹⁰ For example, Joseph Engelberger, a pioneer in industrial robotics, once remarked: "I can't define a robot, but I know one when I see one."¹¹ According to Encyclopaedia Britannica, a robot is "any automatically operated machine that replaces human effort, though it may not resemble human beings in appearance or perform functions in a humanlike manner".¹² Merriam-Webster describes a robot as a "machine that looks like a human being and performs various complex acts (as walking or talking) of a human being", or a "device that automatically performs complicated often repetitive tasks", or a "mechanism guided by automatic controls".¹³

Etymology

See also: Robots in literature

A scene from Karel Čapek's 1920 play R.U.R. (Rossum's Universal Robots), showing three robots

The word robot was introduced to the public by Czech writer Karel Čapek in his play R.U.R. (Rossum's Universal Robots), which premiered in 1921.¹⁴ The play begins in a factory that makes artificial people called robots, but they are closer to the modern ideas of androids and clones, creatures who can be mistaken for humans. They can plainly think for themselves, though they seem happy to serve. At issue is whether the robots are being exploited and the consequences of their treatment.

However, Karel Čapek himself did not coin the word; he wrote a short letter in reference to an etymology in the Oxford English Dictionary in which he named his brother, the painter and writer Josef Čapek, as its actual originator.¹⁴ In an article in the Czech journal Lidové noviny in 1933, he explained that he had originally wanted to call the creatures laboři (from Latin labor, work). However, he did not like the word, and sought advice from his brother Josef, who suggested "roboti". The word robota means literally work, labor or serf labor, and figuratively "drudgery" or "hard work" in Czech and many Slavic languages.¹⁵ Serfdom was outlawed in 1848 in Bohemia, so at the time Čapek wrote R.U.R., usage of the term robota had broadened to include various types of work, but the obsolete sense of "serfdom" would still have been known.¹⁶¹⁷

History

Main article: History of robots

Many ancient mythologies include artificial people, such as the mechanical servants built by the Greek god Hephaestus¹⁸ (Vulcan to the Romans), the clay golems of Jewish legend and clay giants of Norse legend, and Galatea, the mythical statue of Pygmalion that came to life.

In the 4th century BC, the Greek mathematician Archytas of Tarentum postulated a mechanical steam-operated bird he called "The Pigeon". Hero of Alexandria (10–70 AD) created numerous user-configurable automated devices, and described machines powered by air pressure, steam and water.¹⁹ Su Song built a clock tower in China in 1088 featuring mechanical figurines that chimed the hours.²⁰

Al-Jazari's programmable humanoid robots

Al-Jazari (1136–1206), a Muslim inventor during the Artuqid dynasty, designed and constructed a number of automated machines, including kitchen appliances, musical automata powered by water, and the first programmable humanoid robots in 1206. The robots appeared as four musicians on a boat in a lake, entertaining guests at royal drinking parties. His mechanism had a programmable drum machine with pegs (cams) that bumped into little levers that operated percussion instruments. The drummer could be made to play different rhythms and different drum patterns by moving the pegs to different locations.

Early modern developments

Tea-serving karakuri, with mechanism, 19th century. Tokyo National Science Museum.

Leonardo da Vinci (1452–1519) sketched plans for a humanoid robot around 1495. Da Vinci's notebooks, rediscovered in the 1950s, contain detailed drawings of a mechanical knight now known as Leonardo's robot, able to sit up, wave its arms and move its head and jaw.²¹ The design was probably based on anatomical research recorded in his Vitruvian Man. It is not known whether he attempted to build it.

In 1738 and 1739, Jacques de Vaucanson exhibited several life-sized automatons: a flute player, a pipe player and a duck. The mechanical duck could flap its wings, crane its neck, and swallow food from the exhibitor's hand, and it gave the illusion of digesting its food by excreting matter stored in a hidden compartment.²² Complex mechanical toys and animals built in Japan in the 1700s were described in the Karakuri zui (Illustrated Machinery, 1796).

Modern developments

The Japanese craftsman Hisashige Tanaka (1799–1881), known as "Japan's Edison", created an array of extremely complex mechanical toys, some of which served tea, fired arrows drawn from a quiver, and even painted a Japanese kanji character.²³ In 1898 Nikola Tesla publicly demonstrated a radio-controlled torpedo.²⁴ Based on patents for "teleautomation", Tesla hoped to develop it into a weapon system for the US Navy.²⁵²⁶

The first Unimate

In 1926, Westinghouse Electric Corporation created Televox, the first robot put to useful work. They followed Televox with a number of other simple robots, including one called Rastus, made in the crude image of a black man. In the 1930s, they created a humanoid robot known as Elektro for exhibition purposes, including the 1939 and 1940 World's Fairs. ²⁷²⁸ In 1928, Japan's first robot, Gakutensoku, was designed and constructed by biologist Makoto Nishimura.

The first electronic autonomous robots were created by William Grey Walter of the Burden Neurological Institute at Bristol, England in 1948 and 1949. They were named Elmer and Elsie. These robots could sense light and contact with external objects, and use these stimuli to navigate. ²⁹

The first truly modern robot, digitally operated and programmable, was invented by George Devol in 1954 and was ultimately called the Unimate. Devol sold the first Unimate to General Motors in 1960, and it was installed in 1961 in a plant in Trenton, New Jersey to lift hot pieces of metal from a die casting machine and stack them.³⁰

Timeline

Contemporary uses

This article is in a list format that may be better presented using prose. You can help by converting this section to prose, if appropriate. Editing help is available. (October 2008)

Automated guided vehicle carrying medical supplies and records

Main articles: Industrial robot and Domestic robot

There were more than one million robots in operation worldwide in the first half of 2008, with roughly half in Asia, 32% in Europe, 16% in North America, 1% in Australasia and 1% in Africa.³⁴ Industrial and service robots can be placed into roughly two classifications based on the type of job they do. The first category includes tasks which a robot can do with greater productivity, accuracy, or endurance than humans; the second category consists of dirty, dangerous or dull jobs which humans find undesirable.

Increased productivity, accuracy, and endurance

Many factory jobs are now performed by robots. This has led to cheaper mass-produced goods, including automobiles and electronics. Stationary manipulators used in factories have become the largest market for robots.

German KUKA Industrial robots doing vehicle underbody assembly

Some examples of factory robots:

• Car production: Over the last three decades automobile factories have become dominated by robots. A typical factory contains hundreds of industrial robots working on fully automated production lines, with one robot for every ten human workers. On an automated production line, a vehicle chassis on a conveyor is welded, glued, painted and finally assembled at a sequence of robot stations.
• Packaging: Industrial robots are also used extensively for palletizing and packaging of manufactured goods, for example for rapidly taking drink cartons from the end of a conveyor belt and placing them into boxes, or for loading and unloading machining centers.
• Electronics: Mass-produced printed circuit boards (PCBs) are almost exclusively manufactured by pick-and-place robots, typically with SCARA manipulators, which remove tiny electronic components from strips or trays, and place them on to PCBs with great accuracy.³⁵ Such robots can place hundreds of thousands of components per hour, far out-performing a human in speed, accuracy, and reliability.³⁶
• Automated guided vehicles (AGVs): Mobile robots, following markers or wires in the floor, or using vision³⁷ or lasers, are used to transport goods around large facilities, such as warehouses, container ports, or hospitals.³⁸
  • Early AGV-Style Robots were limited to tasks that could be accurately defined and had to be performed the same way every time. Very little feedback or intelligence was required, and the robots needed only the most basic exteroceptors (sensors). The limitations of these AGVs are that their paths are not easily altered and they cannot alter their paths if obstacles block them. If one AGV breaks down, it may stop the entire operation.

• • Interim AGV-Technologies developed that deploy triangulation from beacons or bar code grids for scanning on the floor or ceiling. In most factories, triangulation systems tend to require moderate to high maintenance, such as daily cleaning of all beacons or bar codes. Also, if a tall pallet or large vehicle blocks beacons or a bar code is marred, AGVs may become lost. Often such AGVs are designed to be used in human-free environments.

• • Newer AGVs such as the Speci-Minder,³⁹ ADAM, ⁴⁰ Tug⁴¹ and PatrolBot Gofer⁴² are designed for people-friendly workspaces. They navigate by recognizing natural features. 3D scanners or other means of sensing the environment in two or three dimensions help to eliminate cumulative errors in dead-reckoning calculations of the AGV's current position. Some AGVs can create maps of their environment using scanning lasers with simultaneous localization and mapping (SLAM) and use those maps to navigate in real time with other path planning and obstacle avoidance algorithms. They are able to operate in complex environments and perform non-repetitive and non-sequential tasks such as transporting photomasks in a semiconductor lab, specimens in hospitals and goods in warehouses. For dynamic areas, such as warehouses full of pallets, AGVs require additional strategies. Only a few vision-augmented systems currently claim to be able to navigate reliably in such environments.

Dirty, dangerous, dull or inaccessible tasks

A U.S. Marine Corps technician prepares to deploy a device that will detonate a buried improvised explosive device near Camp Fallujah, Iraq

There are many jobs which humans would rather leave to robots. The job may be boring, such as domestic cleaning, or dangerous, such as exploring inside a volcano.⁴³ Other jobs are physically inaccessible, such as exploring another planet,⁴⁴ cleaning the inside of a long pipe, or performing laparoscopic surgery.⁴⁵

• Domestic robots: As prices fall and robots become smarter and more autonomous, robots are increasingly being seen in the home where they are taking on simple but unwanted jobs, such as floor cleaning and lawn mowing.

• Telerobots: When a human cannot be present on site to perform a job because it is dangerous, far away, or inaccessible, teleoperated robots, or telerobots are used. Rather than following a predetermined sequence of movements, a telerobot is controlled from a distance by a human operator. The robot may be in another room or another country, or may be on a very different scale to the operator. For instance, a laparoscopic surgery robot allows the surgeon to work inside a human patient on a relatively small scale compared to open surgery, significantly shortening recovery time.⁴⁵ Several authors have been using a device called the Longpen to sign books remotely.⁴⁶

• Military robots: Teleoperated robot aircraft, like the Predator Unmanned Aerial Vehicle, are increasingly being used by the military. These pilotless drones can search terrain and fire on targets.⁴⁷⁴⁸ Hundreds of robots such as iRobot's Packbot and the Foster-Miller TALON are being used in Iraq and Afghanistan by the U.S. military to defuse roadside bombs or Improvised Explosive Devices (IEDs) in an activity known as explosive ordnance disposal (EOD).⁴⁹

• Home automation for the elderly and disabled: The average age of the population is increasing in many countries, especially in Japan, meaning that there are more elderly people to care for and fewer people available to care for them.⁵⁰⁵¹

Robotics Jobs and Training

A robot technician builds small all-terrain robots. (Courtesy: MobileRobots Inc)

As the number of robots increases, robotics-related jobs grow. Some jobs require existing job skills, such as building cables, assembling parts and testing. Other robotics jobs require new skills, such as robot installer and robot integrator.⁵² While universities have long included robotics research in their curricular offerings and tech schools have taught industrial robotic arm control, new college programs in applied mobile robots are under development at universities in both the US and EU, with help from Microsoft, MobileRobots Inc and other companies encouraging the growth of robotics.

Robot Research

Much of the research in robotics focuses not on specific industrial tasks, but on investigations into new types of robots, alternative ways to think about or design robots, and new ways to manufacture them.

• Soft Robots: Robots with silicone bodies and flexible actuators (air muscles, electroactive polymers, and ferrofluids), controlled using fuzzy logic and neural networks, look and feel different from robots with rigid skeletons, and are capable of different behaviors.⁵³

A swarm of robots from the Open-source Micro-robotic Project

• Swarm robots: Inspired by colonies of insects such as ants and bees, researchers are modeling the behavior of swarms of thousands of tiny robots which together perform a useful task, such as finding something hidden, cleaning, or spying. Each robot is quite simple, but the emergent behavior of the swarm is more complex. The whole set of robots can be considered as one single distributed system, in the same way an ant colony can be considered a superorganism, exhibiting swarm intelligence. The largest swarms so far created include the iRobot swarm, the SRI/MobileRobots CentiBots project ⁵⁴ and the Open-source Micro-robotic Project swarm, which are being used to research collective behaviors.⁵⁵⁵⁶ Swarms are also more resistant to failure. Whereas one large robot may fail and ruin a mission, a swarm can continue even if several robots fail. This could make them attractive for space exploration missions, where failure can be extremely costly.⁵⁷
• Haptic interface robots: Robotics also has application in the design of virtual reality interfaces. Specialized robots are in widespread use in the haptic research community. These robots, called "haptic interfaces" allow touch-enabled user interaction with real and virtual environments. Robotic forces allow simulating the mechanical properties of "virtual" objects, which users can experience through their sense of touch.⁵⁸
• Generation Robots: First, second and third generation robots are terms used by Professor Hans Moravec, Principal Research Scientist at the Carnegie Mellon University Robotics Institute in describing the near future evolution of robot technology.⁵⁹ First generation robots, researcher Hans predicted in 1997, should have an intellectual capacity comparable to perhaps a lizard and should become available by 2010. Because the first generation robot would be incapable of learning, however, professor Hans predicts that the second generation robot would be an improvement over the first and become available by 2020, with an intelligence maybe comparable to that of a mouse. The third generation robot should have an intelligence comparable to that of a monkey. Though fourth generation robots, robots with human intelligence, professor Hans predicts, would become possible, he does not predict this happening before around 2040 or 2050.

Potential problems

The Roomba domestic vacuum cleaner robot does a menial job

Fears and concerns about robots have been repeatedly expressed in a wide range of books and films. A common theme is the development of a master race of conscious and highly intelligent robots, motivated to take over or destroy the human race. (See The Terminator, Runaway, Bladerunner, Robocop, the Replicators in Stargate, the Cylons in Battlestar Galactica, The Matrix, and I, Robot.) Some fictional robots are programmed to kill and destroy; others gain superhuman intelligence and abilities by upgrading their own software and hardware. Another common theme is the reaction, sometimes called the "uncanny valley", of unease and even revulsion at the sight of robots that mimic humans too closely.⁶⁰ Frankenstein (1818), often called the first science fiction novel, has become synonymous with the theme of a robot or monster advancing beyond its creator.

Manuel De Landa has noted that "smart missiles" and autonomous bombs equipped with artificial perception can be considered robots, and they make some of their decisions autonomously. He believes this represents an important and dangerous trend in which humans are handing over important decisions to machines.⁶¹

Marauding robots may have entertainment value, but unsafe use of robots constitutes an actual danger. A heavy industrial robot with powerful actuators and unpredictably complex behavior can cause harm, for instance by stepping on a human's foot or falling on a human. Most industrial robots operate inside a security fence which separates them from human workers, but not all. The first fatality involving a robot was Robert Williams, who was struck by a robotic arm at a casting plant in Flat Rock, Michigan on January 25, 1979. ⁶² The second was 37-year-old Kenji Urada, a Japanese factory worker, in 1981. Urada was performing routine maintenance on the robot, but neglected to shut it down properly, and was accidentally pushed into a grinding machine.⁶³

Literature

See also: List of fictional robots and androids and Robots in literature

An android, or robot designed to resemble a human, can appear comforting to some people and disturbing to others⁶⁰

Robotic characters, androids (artificial humans) and cyborgs (also "bionic men", or humans with significant mechanical enhancements) have become a staple of science fiction.

The first reference in Western literature to mechanical servants appears in Homer's Iliad. In Book XVIII, Hephaestus, god of fire, creates new armor for the hero Achilles, assisted by robots.⁶⁴ According to the Rieu translation, "Golden maidservants hastened to help their master. They looked like real women and could not only speak and use their limbs but were endowed with intelligence and trained in handwork by the immortal gods." Of course, the words "robot" or "android" are not used to describe them, but they are nevertheless mechanical devices human in appearance.

The most prolific author of stories about robots was Isaac Asimov (1920–1992), who placed robots and their interaction with society at the center of many of his works.⁶⁵⁶⁶ Asimov carefully considered the problem of the ideal set of instructions robots might be given in order to lower the risk to humans, and arrived at his Three Laws of Robotics: a robot may not injure a human being or, through inaction, allow a human being to come to harm; a robot must obey orders given to it by human beings, except where such orders would conflict with the First Law; and a robot must protect its own existence as long as such protection does not conflict with the First or Second Law.⁶⁷ These were introduced in his 1942 short story "Runaround", although foreshadowed in a few earlier stories. Later, Asimov added the Zeroth Law: "A robot may not harm humanity, or, by inaction, allow humanity to come to harm"; the rest of the laws are modified sequentially to acknowledge this.

According to the Oxford English Dictionary, the first passage in Asimov's short story "Liar!" (1941) that mentions the First Law is the earliest recorded use of the word robotics. Asimov was not initially aware of this; he assumed the word already existed by analogy with mechanics, hydraulics, and other similar terms denoting branches of applied knowledge.⁶⁸

See also

Robotics portal

Main list: Topic outline of robotics

For classes and types of robots see Category:Robots.

Notes and references

Further reading

• Cheney, Margaret [1989:123] (1981). Tesla, Man Out of Time. Dorset Press. New York. ISBN 0-88029-419-1
• Craig, J.J. (2005). Introduction to Robotics. Pearson Prentice Hall. Upper Saddle River, NJ.
• Needham, Joseph (1986). Science and Civilization in China: Volume 2. Taipei: Caves Books Ltd.
• Sotheby's New York. The Tin Toy Robot Collection of Matt Wyse, (1996)
• Tsai, L. W. (1999). Robot Analysis. Wiley. New York.
• DeLanda, Manuel. War in the Age of Intelligent Machines. 1991. Swerve. New York.

External links

Wikibooks has a book on the topic of Robotics

At Wikiversity, you can learn about: Anthropomorphic Robotics

Wikimedia Commons has media related to: Robots

Look up robot in Wiktionary, the free dictionary.

Encyclopaedias

• Robot article at Britannica

Hobbyist tutorials

• Ikalogic – tutorials, active discussion board, most material is copyleft
• SocietyOfRobots – tutorials, active discussion board

News sites

• Robots.net – Daily news about robots, robotics, and AI

Other links

• Giant list of known robots
• IFR.org picture gallery – Pictures and classification of industrial robots. The larger site is a trade group with many possibly useful links.
• Robotics at DMOZ at the Open Directory Project
• Robotics Research Papers at DMOZ

Research societies

• IEEE Robotics and Automation Society (RAS) and its wiki
• International Foundation of Robotics Research (IFRR)
• NASA Robotics Division
• The roboethics official website