Although Barricelli, in work he reported in 1963, had simulated the evolution of ability to play a simple game, artificial evolution became a widely recognized optimization method as a result of the work of Ingo Rechenberg and Hans-Paul Schwefel in the 1960s and early 1970s – Rechenberg's group was able to solve complex engineering problems through evolution strategies. Another approach was the evolutionary programming technique of Lawrence J. Fogel, which was proposed for generating artificial intelligence. Evolutionary programming originally used finite state machines for predicting environments, and used variation and selection to optimize the predictive logics. Genetic algorithms in particular became popular through the work of John Holland in the early 1970s, and particularly his book "Adaptation in Natural and Artificial Systems" (1975). His work originated with studies of cellular automata, conducted by Holland and his students at the University of Michigan. Holland introduced a formalized framework for predicting the quality of the next generation, known as Holland's schema theorem. Research in GAs remained largely theoretical until the mid-1980s, when The First International Conference on Genetic Algorithms was held in Pittsburgh, Pennsylvania.
Ingo Rechenberg
"Ingo Rechenberg"' (born January 20 1934 in Berlin) is a German computer scientist and professor. Rechenberg is a pioneer of the fields of evolutionary computation and artificial evolution. In the 1960s and 1970s he invented a highly influential set of optimization methods known as evolution strategies (from German "Evolutionsstrategie"). His group successfully applied the new algorithms to challenging problems such as aerodynamic wing design. These were the first serious technical applications of artificial evolution, an important subset of the still growing field of bionics.
Rechenberg was educated at the Technical University of Berlin and at the University of Cambridge. Since 1972 he has been a full professor at the Technical University of Berlin, where he is heading the Department of Bionics and Evolution Techniques.
His awards include the Lifetime Achievement Award of the Evolutionary Programming Society (US, 1995) and the Evolutionary Computation Pioneer Award of the IEEE Neural Networks Society (US, 2002). In 1954, Rechenberg also became world champion in the field of model airplanes.
Evolution strategy
Evolution strategies are ways to solve a problem using evolutionary algorithms. The term was coined by Ingo Rechenberg.
John Henry Holland
John Henry Holland (February 2, 1929 – August 9, 2015) was an American scientist. He was Professor of Psychology and Professor of Electrical Engineering and Computer Science at the University of Michigan, Ann Arbor. He was a pioneer in complex system and nonlinear science. He was known as the father of genetic algorithms.
Holland died on August 9, 2015 in Ann Arbor, Michigan, aged 86.
Ontario Lacus
Ontario Lacus is a lake filled with methane and ethane near the south pole of Saturn's moon Titan. It was identified as a hydrocarbon lake and confirmed by data from the Cassini spacecraft. This discovery was announced in the 31 July 2008 edition of "Nature". Ontario Lacus is about 20,000 km in area, and is named after Lake Ontario in North America, which is a similar size and shape.
Penetrometer
A penetrometer is a device to test the strength of a material.
It is often used on soil. The penetrometer is dropped on soil or it is pressed against soil to measure how deep a hole it makes. This is a way to decide if soil is strong enough to build a road on. Scientists can use a penetrometer to measure how much moisture is in soil. Penetrometers are used on space probes such as the Cassini-Huygens probe, to measure the amount of moisture in soil on other planets.
Crème brûlée
Crème brûlée (or Crème brulée) is a dessert. It is made of custard. It is topped with a thin, brittle crust of caramelized sugar. It may be served cold, warm, or at room temperature. The custard is baked, and then sprinkled with sugar Casa that is caramelized under a broiler or with a kitchen blowtorch. The custard is flavored with vanilla. Other flavorings include chocolate, orange liqueur, fruit, or other. The caramelized sugar crust can be covered with a liqueur and set on fire.
The exact origin of crème brûlée is uncertain. France, England, and Spain all claim to be the country where crème brûlée had its origin. The first printed recipe for a dessert called crème brûlée is from the 1691 edition of the French cookbook "Le Cuisinier Royal et Bourgeois" by Francois Massialot, a cook at the Palace of Versailles. That version was a sweet custard of egg yolks and milk with a burnt sugar crust. It is similar to the modern versions. In the second edition of the book, the dessert is called "crème anglaise".
At Trinity College, Cambridge the dessert was known as 'burnt cream'. The college crest was burnt into sugar on top of a custard using a hot iron. It may predate Massialot's cookbook with one authority claiming it was first served at Trinity in 1630.
Catalans claim their dessert known as "crema catalana" is the original. It is a rich custard often flavoured with cinnamon and lemon or orange zest topped with carmelized sugar. The Catalan version was first recorded in the 18th century. It is also called "Crema de Sant Josep", after Saint Joseph, the husband of the Virgin Mary. In Spain and in many other parts of Europe, Saint Joseph’s Day is celebrated on 19 March. "Crema Catalana" is a traditional dessert served on this day.
Kraken Mare
Kraken Mare is the largest known lake on the surface of Saturn's moon Titan. It was discovered in 2007 by the Cassini probe and was named in 2008 after the Kraken, a legendary sea monster.
Kraken Mare is believed to be the largest of seas and lakes near Titan's north pole. It was discovered as a sea of hydrocarbons by radar pictures. Only a small part of the sea has been pictured by radar, but its full size is seen in visible light pictures. Kraken Mare is believed to be similar in size to the Caspian Sea.
An island in the sea is named Mayda Insula.
Ligeia Mare
Ligeia Mare is a lake on Titan at 79.0° N, 248.0° W, measuring around 500 km in width. It is named after Ligeia, one of the sirens in Greek mythology. Ligeia Mare has been a proposed lake to land the Titan Lake In-situ Sampling Propelled Explorer space probe
Keystream
In cryptography, a keystream is a stream of random or pseudorandom characters that are combined with a plaintext message to produce an encrypted message (the ciphertext).
The "characters" in the keystream can be bits, bytes, numbers or actual characters like A-Z depending on the usage case.
Usually each character in the keystream is either added, subtracted or XORed with a character in the plaintext to produce the ciphertext, using modular arithmetic.
Keystreams are used in the one-time pad cipher and in most stream ciphers. Block ciphers can also be used to produce keystreams. For example, the CTR mode (also known as Integer Counter Mode (ICM)) is a block mode that makes a block cipher produce a keystream then turns the block cipher into a stream cipher.
In this simple example we will use only the English alphabet of 26 characters from a-z, therefore we will not encrypt numbers, commas, spaces and other symbols. As we have only 26 characters the random numbers in the keystream have to be at least between 0 and 25.
To encrypt we add the keystream numbers to the plaintext. And to decrypt we subtract the same keystream numbers from the ciphertext to get the plaintext.
If a ciphertext number becomes larger than 25 we wrap it to a value between 0-25. I.e. 26 becomes 0 and 27 becomes 1 and so on. (Such wrapping is called modular arithmetic.)
Here the plaintext message "attack at dawn" is combined by addition with the keystream "kjcngmlhylyu" and produces the ciphertext "kcvniwlabluh".
Noor Jehan