Indifferents as an interface between Contra and Pro (2009)
Malarz, Krzysztof, Kulakowski, Krzysztof
In most sociophysical simulations on public opinion, only two opinions are allowed: Pro and Contra. However, in all political elections many people do not vote. Here we analyse two models of dynamics...
Assortativity in random line graphs (2009)
Manka-Krason, Anna, Kulakowski, Krzysztof
We investigate the degree-degree correlations in the Erdos-Renyi networks, the growing exponential networks and the scale-free networks. We demonstrate that these correlations are the largest for the...
Hate: no choice. Agent simulations (2009)
Kulakowski, Krzysztof, Krawczyk, Malgorzata J., Gawronski, Przemyslaw
We report our recent simulations on the social processes which -- in our opinion -- lie at the bottom of hate. First simulation deals with the so-called Heider balance where initial purely random...
Zaller-Deffuant model of public opinion (2009)
Malarz, Krzysztof, Gronek, Piotr, Kulakowski, Krzysztof
Recent formulation of the Zaller model of mass opinion is generalized to include the interaction between agents. The mechanism of interaction is close to the bounded confidence model. The outcome of...
Frustration and collectivity in spatial networks (2009)
Manka-Krason, Anna, Kulakowski, Krzysztof
In random networks decorated with Ising spins, an increase of the density of frustrations reduces the transition temperature of the spin-glass ordering. This result is in contradiction to the Bethe...
Scaling of spin avalanches in growing networks (2009)
Tomkowicz, Joanna, Kulakowski, Krzysztof
Growing networks decorated with antiferromagnetically coupled spins are archetypal examples of complex systems due to the frustration and the multivalley character of their energy landscapes. Here we...
Clustering in random line graphs (2009)
Manka-Krason, Anna, Mwijage, Advera, Kulakowski, Krzysztof
We investigate the degree distribution $P(k)$ and the clustering coefficient $C$ of the line graphs constructed on the Erd\"os-R\'enyi networks, the exponential and the scale-free growing networks....
To cooperate or to defect? Altruism and reputation (2009)
Kulakowski, Krzysztof, Gawronski, Przemyslaw
The basic problem in the cooperation theory is to justify the cooperation. Here we propose a new approach, where players are driven by their altruism to cooperate or not. The probability of...
Magnetism of frustrated regular networks (2008)
Manka-Krason, Anna, Kulakowski, Krzysztof
We consider a regular random network where each node has exactly three neighbours. Ising spins at the network nodes interact antiferromagnetically along the links. The clustering coefficient $C$ is...
The norm game - how a norm fails (2008)
Kulakowski, Krzysztof, Dydejczyk, Antoni
We discuss the simulations of the norm game between players at nodes of a directed random network. The final boldness of the players can vary with the initial one as the $\Theta$ function. One of the...
A note on temperature without energy - a social example (2008)
The fluctuation-dissipation theorem is used to identify the social temperature for a set of agents playing two different strategies.
Opinion polarization in the Receipt-Accept-Sample model (2008)
The Zaller theory of opinion formation is reformulated with one free parameter $\mu$, which measures the largest possible ideological distance which can be made by a citizen in one mental step. Our...
Sociophysics - an astriding science (2008)
Kulakowski, Krzysztof, Nawojczyk, Maria
The status of the sociophysics is discussed as placed between the physics and the sociology. In particular we ask if the second law of thermodynamics can be useful in social sciences.
Cops or robbers - a bistable society (2008)
The norm game described by Axelrod in 1985 was recently treated with the master equation formalism. Here we discuss the equations, where {\it i)} those who break the norm cannot punish and those who...
When the spatial networks split? (2008)
Natkaniec, Joanna, Kulakowski, Krzysztof
We consider a three dimensional spatial network, where $N$ nodes are randomly distributed within a cube $L\times L\times L$. Each two nodes are connected if their mutual distance does not excess a...
Around the gap between sociophysics and sociology (2007)
Some basic sociophysical notions are described by a physicist, tentatively for a sociologically-oriented reader.
Communities in networks - a continuous approach (2007)
Krawczyk, Malgorzata J., Kulakowski, Krzysztof
A system of differential equations is proposed designed as to identify communities in weighted networks. The input is a symmetric connectivity matrix $A_{ij}$. A priori information on the number of...
The Galam Model of Minority Opinion Spreading and the Marriage Gap (2007)
Kulakowski, Krzysztof, Nawojczyk, Maria
In 2002, Serge Galam designed a model of a minority opinion spreading. The effect is expected to lead a conservative minority to prevail if the issue is discussed long enough. Here we analyze the...
Clusterization, frustration and collectivity in random networks (2007)
Manka, Anna, Malarz, Krzysztof, Kulakowski, Krzysztof
We consider the random Erd{\H o}s--R\'enyi network with enhanced clusterization and Ising spins $s=\pm 1$ at the network nodes. Mutually linked spins interact with energy $J$. Magnetic properties of...
Some recent attempts to simulate the Heider balance problem (2006)
The Heider balance is a sociological problem of a division of a community into hostile groups, where all interpersonal relations within the groups are friendly and all relations between the members...
Phase transition in Nowak-Sznajd opinion dynamics (2006)
Woloszyn, Maciej, Stauffer, Dietrich, Kulakowski, Krzysztof
The Nowak modification of the Sznajd opinion dynamics model on the square lattice assumes that with probabilities beta and gamma the opinions flip due to mass-media advertising from down to up, and...
Remanence and switching sensitivity in nanodot magnetic arrays (2006)
Gawronski, Przemyslaw, Kulakowski, Krzysztof
New results are reported of the computer simulations on the magnetic behaviour of magnetic arrays of nanoscopic dots, placed in cells of the square lattice. We show that the remanence magnetization...
2nd Polish Symposium on Econo- and Sociophysics (2006)
Burda, Zdzislaw, Holyst, Janusz, Jurkiewicz, Jerzy, Kulakowski, Krzysztof, Malarz, Krzysztof, Nowak, Maciej A, ...
Efficiency of pair formation in a model society (2006)
Wasko, Mateusz, Kulakowski, Krzysztof
In a recent paper a set of differential equations was proposed to describe a social process, where pairs of partners emerge in a community. The choice was performed on a basis of attractive resources...
Cooperation and defection in ghetto (2005)
We consider ghetto as a community of people ruled against their will by an external power. Members of the community feel that their laws are broken. However, attempts to leave ghetto makes their...
How political parties adjust to fixed voter opinions (2005)
We propose a new version of the spatial model of voting. Platforms of five parties are evolving in a two-dimensional landscape of political issues so as to get maximal numbers of voters. For a...
The Heider balance - a continuous approach (2005)
Kulakowski, Krzysztof, Gawronski, Przemyslaw, Gronek, Piotr
The Heider balance (HB) is investigated in a fully connected graph of $N$ nodes. The links are described by a real symmetric array r(i,j), i,j=1,...,N. In a social group, nodes represent group...
Transition from Uniform Motion to Stick-Slip in the Rice-Ruina Model of One and Two Blocks (2004)
Szkutnik, Jacek, Kulakowski, Krzysztof
We analyze the Rice-Ruina state and rate dependent friction model. The system consists of one or two blocks driven by springs with constant velocity on a dry, rough surface. Our discussion is limited...