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An interplay model for rumour spreading and emergency development

Zhang, Zi-li; Zhang, Zi-qiong - In: Physica A: Statistical Mechanics and its Applications 388 (2009) 19, pp. 4159-4166

Rumours influence how people make decisions in an emergency-affected environment. Conversely, the development of … emergency development. Then, we describe a formulation of this model and derive, from differential equations for some … emergency. Finally, we outline a strategy for authorities that can contribute to rumour management in an emergency event. …

Persistent link: https://www.econbiz.de/10010589178

Evacuation behaviors at exit in CA model with force essentials: A comparison with social force model

Wei-Guo, Song; Yan-Fei, Yu; Bing-Hong, Wang; Wei-Cheng, Fan - In: Physica A: Statistical Mechanics and its Applications 371 (2006) 2, pp. 658-666

The problem of emergent evacuation is of obvious importance in common life. However, many existing evacuation models are either computationally inefficient, or are missing some crucial human behaviors in crowds. In this paper, we improve a cellular automata (CA) model introduced recently, which...

Persistent link: https://www.econbiz.de/10010589972

Community detection based on modularity and an improved genetic algorithm

Shang, Ronghua; Bai, Jing; Jiao, Licheng; Jin, Chao - In: Physica A: Statistical Mechanics and its Applications 392 (2013) 5, pp. 1215-1231

Complex networks are widely applied in every aspect of human society, and community detection is a research hotspot in complex networks. Many algorithms use modularity as the objective function, which can simplify the algorithm. In this paper, a community detection method based on modularity and...

Persistent link: https://www.econbiz.de/10010873318

The valuation of equity warrants under the fractional Vasicek process of the short-term interest rate

Xiao, Weilin; Zhang, Weiguo; Zhang, Xili; Chen, Xiaoyan - In: Physica A: Statistical Mechanics and its Applications 394 (2014) C, pp. 320-337

Motivated by the empirical evidence of long range dependence in short-term interest rates and considering the long maturities of equity warrants, we propose the fractional Vasicek model to describe the dynamics of the short rate in the pricing environment of equity warrants. Using the partial...

Persistent link: https://www.econbiz.de/10010873438

Bit-string models for parasex

Moss de Oliveira, S; de Oliveira, P.M.C; Stauffer, D - In: Physica A: Statistical Mechanics and its Applications 322 (2003) C, pp. 521-530

We present different bit-string models of haploid asexual populations in which individuals may exchange part of their genome with other individuals (parasex) according to a given probability. We study the advantages of this parasex concerning population sizes, genetic fitness and diversity. We...

Persistent link: https://www.econbiz.de/10010874158

Fast computing global structural balance in signed networks based on memetic algorithm

Sun, Yixiang; Du, Haifeng; Gong, Maoguo; Ma, Lijia; … - In: Physica A: Statistical Mechanics and its Applications 415 (2014) C, pp. 261-272

Structural balance is a large area of study in signed networks, and it is intrinsically a global property of the whole network. Computing global structural balance in signed networks, which has attracted some attention in recent years, is to measure how unbalanced a signed network is and it is a...

Persistent link: https://www.econbiz.de/10010939952

Pricing model for equity warrants in a mixed fractional Brownian environment and its algorithm

Xiao, Wei-Lin; Zhang, Wei-Guo; Zhang, Xili; Zhang, Xiaoli - In: Physica A: Statistical Mechanics and its Applications 391 (2012) 24, pp. 6418-6431

This paper deals with the problem of pricing equity warrants in a mixed fractional Brownian environment. Based on the quasi-conditional expectation and the Fourier transform, we present the pricing model for equity warrants. Moreover, a hybrid intelligent algorithm, which is based on the Genetic...

Persistent link: https://www.econbiz.de/10010872281

Evolvable hardware: genetic search in a physical realm

Raichman, Nadav; Segev, Ronen; Ben-Jacob, Eshel - In: Physica A: Statistical Mechanics and its Applications 326 (2003) 1, pp. 265-285

The application of evolution-inspired strategies to hardware design and circuit self-configuration leads to the concept of evolvable hardware (EHW). EHW refers to self-configuration of electronic hardware by evolutionary/genetic algorithms (EA and GA, respectively). Unconventional circuits, for...

Persistent link: https://www.econbiz.de/10010872306

Roulette-wheel selection via stochastic acceptance

Lipowski, Adam; Lipowska, Dorota - In: Physica A: Statistical Mechanics and its Applications 391 (2012) 6, pp. 2193-2196

Roulette-wheel selection is a frequently used method in genetic and evolutionary algorithms or in modeling of complex networks. Existing routines select one of N individuals using search algorithms of O(N) or O(logN) complexity. We present a simple roulette-wheel selection algorithm, which...

Persistent link: https://www.econbiz.de/10010589517

Invisible hand effect in an evolutionary minority game model

Sysi-Aho, Marko; Saramäki, Jari; Kaski, Kimmo - In: Physica A: Statistical Mechanics and its Applications 347 (2005) C, pp. 639-652

In this paper, we study the properties of a minority game with evolution realized by using genetic crossover to modify fixed-length decision-making strategies of agents. Although the agents in this evolutionary game act selfishly by trying to maximize their own performances only, it turns out...

Persistent link: https://www.econbiz.de/10011058268