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Physicalization
Physicalization of computer hardware (the opposite of virtualization), is a way to place multiple physical machines in a rack unit. It can be a way to reduce hardware costs, since in some cases, server processors cost more per core than energy efficient laptop processors, which may make up for added cost of board level integration. While Moore's law makes increasing integration less expensive, some jobs require much I/O bandwidth, which may be less expensive to provide using many less-integrated processors. Applications and services that are I/O bound are likely to benefit from such physicalized environments. This ensures that each operating system instance is running on a processor that has its own network interface card, host bus and I/O sub-system unlike in the case of a multi-core servers where a single I/O sub-system is shared between all the cores / VMs. A data physicalization (or simply physicalization) is a physical artefact whose geometry or material properties encode ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Physical-to-Virtual
In computing. Physical-to-Virtual ("P2V" or "p-to-v" ) involves the process of decoupling and migrating a physical server's operating system (OS), applications, and data from that physical server to a virtual-machine guest hosted on a virtualized platform. Methods of P2V migration Manual P2V User manually creates a virtual machine in a virtual host environment and copies all the files from OS, applications and data from the source machine. Semi-automated P2V Performing a P2V migration using a tool that assists the user in moving the servers from physical state to virtual machine. * Microsoft'Virtual Server 2005 Migration Toolkit * |
Hardware Virtualization
Hardware virtualization is the virtualization of computers as complete hardware platforms, certain logical abstractions of their componentry, or only the functionality required to run various operating systems. Virtualization hides the physical characteristics of a computing platform from the users, presenting instead an abstract computing platform. At its origins, the software that controlled virtualization was called a "control program", but the terms "hypervisor" or "virtual machine monitor" became preferred over time. Concept The term "virtualization" was coined in the 1960s to refer to a virtual machine (sometimes called "pseudo machine"), a term which itself dates from the experimental IBM M44/44X system. The creation and management of virtual machines has been called "platform virtualization", or "server virtualization", more recently. Platform virtualization is performed on a given hardware platform by ''host'' software (a ''control program''), which creates a simu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lego
Lego ( , ; stylized as LEGO) is a line of plastic construction toys that are manufactured by The Lego Group, a privately held company based in Billund, Denmark. The company's flagship product, Lego, consists of variously colored interlocking plastic bricks accompanying an array of gears, figurines called minifigures, and various other parts. Lego pieces can be assembled and connected in many ways to construct objects, including vehicles, buildings, and working robots. Anything constructed can be taken apart again, and the pieces reused to make new things. The Lego Group began manufacturing the interlocking toy bricks in 1949. Movies, games, competitions and eight Legoland amusement parks have been developed under the brand. , 600 billion Lego parts had been produced. History The Lego Group began in the workshop of Ole Kirk Christiansen (1891–1958), a carpenter from Billund, Denmark, who began making wooden toys in 1932. In 1934, his company came to be cal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Max Perutz
Max Ferdinand Perutz (19 May 1914 – 6 February 2002) was an Austrian-born British molecular biologist, who shared the 1962 Nobel Prize for Chemistry with John Kendrew, for their studies of the structures of haemoglobin and myoglobin. He went on to win the Royal Medal of the Royal Society in 1971 and the Copley Medal in 1979. At Cambridge he founded and chaired (1962–79) The Medical Research Council (MRC) Laboratory of Molecular Biology (LMB), fourteen of whose scientists have won Nobel Prizes. Perutz's contributions to molecular biology in Cambridge are documented in ''The History of the University of Cambridge: Volume 4 (1870 to 1990)'' published by the Cambridge University Press in 1992. Early life and education Perutz was born in Vienna, the son of Adele "Dely" (Goldschmidt) and Hugo Perutz, a textile manufacturer. His parents were Jewish by ancestry, but had baptised Perutz in the Catholic religion. Although Perutz rejected religion and was an atheist in his late ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bell Curve
In statistics, a normal distribution or Gaussian distribution is a type of continuous probability distribution for a real-valued random variable. The general form of its probability density function is : f(x) = \frac e^ The parameter \mu is the mean or expectation of the distribution (and also its median and mode), while the parameter \sigma is its standard deviation. The variance of the distribution is \sigma^2. A random variable with a Gaussian distribution is said to be normally distributed, and is called a normal deviate. Normal distributions are important in statistics and are often used in the natural and social sciences to represent real-valued random variables whose distributions are not known. Their importance is partly due to the central limit theorem. It states that, under some conditions, the average of many samples (observations) of a random variable with finite mean and variance is itself a random variable—whose distribution converges to a normal dist ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Regression Toward The Mean
In statistics, regression toward the mean (also called reversion to the mean, and reversion to mediocrity) is the fact that if one sample of a random variable is extreme, the next sampling of the same random variable is likely to be closer to its mean. Furthermore, when many random variables are sampled and the most extreme results are intentionally picked out, it refers to the fact that (in many cases) a second sampling of these picked-out variables will result in "less extreme" results, closer to the initial mean of all of the variables. Mathematically, the strength of this "regression" effect is dependent on whether or not all of the random variables are drawn from the same distribution, or if there are genuine differences in the underlying distributions for each random variable. In the first case, the "regression" effect is statistically likely to occur, but in the second case, it may occur less strongly or not at all. Regression toward the mean is thus a useful concept to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Francis Galton
Sir Francis Galton, FRS FRAI (; 16 February 1822 – 17 January 1911), was an English Victorian era polymath: a statistician, sociologist, psychologist, anthropologist, tropical explorer, geographer, inventor, meteorologist, proto- geneticist, psychometrician and a proponent of social Darwinism, eugenics, and scientific racism. He was knighted in 1909. Galton produced over 340 papers and books. He also created the statistical concept of correlation and widely promoted regression toward the mean. He was the first to apply statistical methods to the study of human differences and inheritance of intelligence, and introduced the use of questionnaires and Statistical survey, surveys for collecting data on human communities, which he needed for genealogical and biographical works and for his anthropometrics, anthropometric studies. He was a pioneer of eugenics, coining the term itself in 1883, and also coined the phrase "nature versus nurture". His book ''Hereditary ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Galton Board
The Galton board, also known as the Galton box or quincunx or bean machine, is a device invented by Sir Francis Galton to demonstrate the central limit theorem, in particular that with sufficient sample size the binomial distribution approximates a normal distribution. Among its applications, it afforded insight into regression to the mean or "reversion to mediocrity". Description The Galton board consists of a vertical board with interleaved rows of pegs. Beads are dropped from the top and, when the device is level, bounce either left or right as they hit the pegs. Eventually they are collected into bins at the bottom, where the height of bead columns accumulated in the bins approximate a bell curve. Overlaying Pascal's triangle onto the pins shows the number of different paths that can be taken to get to each bin. Large-scale working models of this device created by Charles and Ray Eames can be seen in the '' Mathematica: A World of Numbers... and Beyond'' exhibits permane ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plan-relief
A plan-relief is a scale model of a landscape and buildings produced for military usage, made to visualize building projects on fortifications or campaigns surrounding fortified locations. History The first examples seem to have been used by the Venetian Republic and more generally by the Italian city-states of the Renaissance era. The wood turner Jakob Sandtner (''fl''. 1561-1579) produced plans-relief of many Bavarian towns, whilst in France Louis XIV's war minister Louvois initiated a collection of plans-relief of French strongholds on a 1:600 scale in 1688. This collection included 144 examples according to Vauban's 1697 inventory of it and was put on a show at the palais des Tuileries. Vauban's successors expanded the collection as and when operational necessity demanded, right up until 1870 when they were rendered obsolete by advances in the power of artillery. Some examples from this collection were destroyed and as a whole, it fell into disrepair until being made a Monum ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Computer Hardware
Computer hardware includes the physical parts of a computer, such as the case, central processing unit (CPU), random access memory (RAM), monitor, mouse, keyboard, computer data storage, graphics card, sound card, speakers and motherboard. By contrast, software is the set of instructions that can be stored and run by hardware. Hardware is so-termed because it is " hard" or rigid with respect to changes, whereas software is "soft" because it is easy to change. Hardware is typically directed by the software to execute any command or instruction. A combination of hardware and software forms a usable computing system, although other systems exist with only hardware. Von Neumann architecture The template for all modern computers is the Von Neumann architecture, detailed in a 1945 paper by Hungarian mathematician John von Neumann. This describes a design architecture for an electronic digital computer with subdivisions of a processing unit consisting of an arithmet ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Erland Nordenskiöld
Baron Nils Erland Herbert Nordenskiöld (19 July 1877 – 5 July 1932) was a Swedish archeologist and anthropologist. Nordenskiöld's research focused on the ethnography and prehistory of South America. Biography He was born in Stockholm, the son of N. A. E. Nordenskiöld. He was educated at Uppsala, was connected with the Museum of Natural History at Stockholm (1906–08), and became director of the ethnographic division of the Göteborg Museum (1913). He made journeys of discovery in Patagonia (1899), in Argentina and Bolivia (1901–02), in Peru and Bolivia (1904–05), in Bolivia (1908–09), and in 1913 in the interior of South America. From these journeys he brought home large collections to Gothenburg where he was head of the Ethnographical Museum. In 1912 he was awarded the Loubat Prize of the Royal Swedish Academy of Letters, History and Antiquities and the Wahlberg gold medal of the Swedish Society for Anthropology and Geography. He was elected a foreign member ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bulla (seal)
A bulla (Medieval Latin for "a round seal", from Classical Latin ''bulla'', "bubble, blob"; plural bullae) is an inscribed clay or soft metal (such as lead or tin) or bitumen or wax token used in commercial and legal documentation as a form of authentication and for tamper-proofing whatever is attached to it (or, in the historical form, contained in it). In their oldest attested form, as used in the ancient Near East and the Middle East of the 8th millennium BC onwards, bullae were hollow clay balls that contained other smaller tokens that identified the quantity and types of goods being recorded. In this form, bullae represent one of the earliest forms of specialization in the ancient world, and likely required skill to create. From about the 4th millennium BC onwards, as communications on papyrus and parchment became widespread, bullae evolved into simpler tokens that were attached to the documents with cord, and impressed with a unique sign (i.e., a seal) to provide the same kin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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