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Search Results: 1 - 10 of 15133 matches for " Christian Stauffer "
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Phase diagram in Bonabeau social hierarchy model with individually different abilities
Christian Schulze,Dietrich Stauffer
Physics , 2004,
Abstract: The 1995 model of Bonabeau et al is generalized by giving each individual a different ability to win or lose a fight. We also introduce different groups such that the losers of fights between different groups are eliminated. The overall phase diagram for the first-order transition between egalitarian and hierarchical societies does not change much by these generalizations.
Urban and Scientific Segregation: The Schelling-Ising Model
Dietrich Stauffer,Christian Schulze
Physics , 2007,
Abstract: Urban segregation of different communities, like blacks and whites in the USA, has been simulated by Ising-like models since Schelling 1971. This research was accompanied by a scientific segregation, with sociologists and physicists ignoring each other until 2000. We review recent progress and also present some new two-temperature multi-cultural simulations.
Competition of languages in the presence of a barrier
Christian Schulze,Dietrich Stauffer
Physics , 2007, DOI: 10.1016/j.physa.2007.02.071
Abstract: Using the Schulze model for Monte Carlo simulations of language competition, we include a barrier between the top half and the bottom half of the lattice. We check under which conditions two different languages evolve as dominating in the two halves.
Monte Carlo simulation of the rise and the fall of languages
Christian Schulze,Dietrich Stauffer
Physics , 2004, DOI: 10.1142/S0129183105007479
Abstract: Similar to biological evolution and speciation we define a language through a string of 8 or 16 bits. The parent gives its language to its children, apart from a random mutation from zero to one or from one to zero; initially all bits are zero. The Verhulst deaths are taken as proportional to the total number of people, while in addition languages spoken by many people are preferred over small languages. For a fixed population size, a sharp phase transition is observed: For low mutation rates, one language contains nearly all people; for high mutation rates, no language dominates and the size distribution of languages is roughly log-normal as for present human languages. A simple scaling law is valid.
Simulation of language competition by physicists
Christian Schulze,Dietrich Stauffer
Physics , 2005,
Abstract: Following Abrams and Strogatz 2003 and Patriarca and Leppanen 2004, five other physics groups independently started to simulate the competition of languages, as opposed to the evolution of a human language out of ape sounds, or the learning of a language by a child. This talk concentrates on the models of Christian Schulze et al and of Viviane de Oliveira et al which allow the simulation of a large number of languages, similar to today's 8,000 human languages. The first model deals with a continuous process of random mutations of a language, transfer from and to other languages, and flight away from languages spoken by only a few people. The second model combines these flight and mutation aspects, ignores transfer and describes the colonization of a large geographical region by people starting at one lattice point. The size of a language is defined by the number of people speaking it. The first model gives a realistic log-normal shape for the histogram of language sizes but the numbers are bad. For the second model our Monte Carlo simulations give sizes up to thousand million, but not the nearly log-normal shape. A meeting is planned for mid-September 2006 in Poland.
Monte Carlo simulation of survival for minority languages
Christian Schulze,Dietrich Stauffer
Physics , 2006,
Abstract: Our earlier language model is modified to allow for the survival of a minority language without higher status, just because of the pride of its speakers in their linguistic identity. An appendix studies the roughness of the interface for linguistic regions when one language conquers the whole territory.
Language simulation after a conquest
Christian Schulze,Dietrich Stauffer
Physics , 2007,
Abstract: When a region is conquered by people speaking another language, we assume within the Schulze model that at each iteration each person with probability s shifts to the conquering language. The time needed for the conquering language to become dominating is about 2/s for directed Barabasi-Albert networks, but diverges on the square lattice for decreasing s at some critical value sc
Sociophysics Simulations I: Language Competition
Christian Schulze,Dietrich Stauffer
Physics , 2005, DOI: 10.1063/1.2008590
Abstract: Using a bit-string model similar to biological simulations, the competition between different languages is simulated both without and with spatial structure. We compare our agent-based work with differential equations and the competing bit-string model of Kosmidis et al.
Microscopic and Macroscopic Simulation of Competition between Languages
Dietrich Stauffer,Christian Schulze
Physics , 2005, DOI: 10.1016/j.plrev.2005.03.001
Abstract: The similarity of the evolution of human languages (or alphabets, bird songs, >...) to biological evolution of species is utilized to study with up to $10^9$ people the rise and fall of languages either by macroscopic differential equations similar to biological Lotka-Volterra equation, or by microscopic Monte Carlo simulations of bit-strings incorporating the birth, maturity, and death of every individual. For our bit-string model, depending on parameters either one language comprises the majority of speakers (dominance), or the population splits into many languages having in order of magnitude the same number of speakers (fragmentation); in the latter case the size distribution is log-normal, with upward deviations for small sizes, just as in reality for human languages. On a lattice two different dominating languages can coexist in neighbouring regions, without being favoured or disfavoured by different status. We deal with modifications and competition for existing languages, not with the evolution or learning of one language.
Computer simulation of language competition by physicists
Christian Schulze,Dietrich Stauffer
Physics , 2006,
Abstract: Computer simulation of languages is an old subject, but since the paper of Abrams and Strogatz (2003) several physics groups independently took up this field. We shortly review their work and bring more details on our own simulations.
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