No exact match found for Zhang Yi-Cheng, using Zhang Yi Cheng instead...
Université de Fribourg

Separate density and viscosity measurements of unknown liquid using quartz crystal microbalance

Tan, Feng ; Qiu, Du-Yu ; Guo, Lian-Ping ; Ye, Peng ; Zeng, Hao ; Jiang, Jun ; Tang, Yong ; Zhang, Yi-Cheng

In: AIP Advances, 2016, vol. 6, no. 9, p. 095313

Aqueous liquids have a wide range of applications in many fields. Basic physical properties like the density and the viscosity have great impacts on the functionalities of a given ionic liquid. For the millions kinds of existing liquids, only a few have been systematically measured with the density and the viscosity using traditional methods. However, these methods are limited to measure the...

Université de Fribourg

Identification of milestone papers through time-balanced network centrality

Mariani, Manuel Sebastian ; Medo, , Matúš ; Zhang, Yi-Cheng

In: Journal of Informetrics, 2016, vol. 10, no. 4, p. 1207–1223

Citations between scientific papers and related bibliometric indices, such as the h- index for authors and the impact factor for journals, are being increasingly used – often in controversial ways – as quantitative tools for research evaluation. Yet, a fundamental research question remains still open: to which extent do quantitative metrics capture the significance of scientific works? We...

Université de Fribourg

Identification and impact of discoverers in online social systems

Medo, Matúš ; Mariani, Manuel S. ; Zeng, An ; Zhang, Yi-Cheng

In: Scientific Reports, 2016, vol. 6, p. 34218

Understanding the behavior of users in online systems is of essential importance for sociology, system design, e-commerce, and beyond. Most existing models assume that individuals in diverse systems, ranging from social networks to e-commerce platforms, tend to what is already popular. We propose a statistical time-aware framework to identify the users who differ from the usual behavior by...

Université de Fribourg

A generalized model via random walks for information filtering

Ren, Zhuo-Ming ; Kong, Yixiu ; Shang, Ming-Sheng ; Zhang, Yi-Cheng

In: Physics Letters A, 2016, vol. 380, no. 34, p. 2608–2614

There could exist a simple general mechanism lurking beneath collaborative filtering and interdisciplinary physics approaches which have been successfully applied to online E-commerce platforms. Motivated by this idea, we propose a generalized model employing the dynamics of the random walk in the bipartite networks. Taking into account the degree information, the proposed generalized model...

Université de Fribourg

Recovery rate affects the effective epidemic threshold with synchronous updating

Shu, Panpan ; Wang, Wei ; Tang, Ming ; Zhao, Pengcheng ; Zhang, Yi-Cheng

In: Chaos: An Interdisciplinary Journal of Nonlinear Science, 2016, vol. 26, no. 6, p. 63108

Accurate identification of effective epidemic threshold is essential for understanding epidemic dynamics on complex networks. In this paper, we systematically study how the recovery rate affects the susceptible-infected-removed spreading dynamics on complex networks, where synchronous and asynchronous updating processes are taken into account. We derive the theoretical effective epidemic...

Université de Fribourg

The mathematics of non-linear metrics for nested networks

Wu, Rui-Jie ; Shi, Gui-Yuan ; Zhang, Yi-Cheng ; Mariani, Manuel Sebastian

In: Physica A: Statistical Mechanics and its Applications, 2016, vol. 460, p. 254–269

Numerical analysis of data from international trade and ecological networks has shown that the non-linear fitness–complexity metric is the best candidate to rank nodes by importance in bipartite networks that exhibit a nested structure. Despite its relevance for real networks, the mathematical properties of the metric and its variants remain largely unexplored. Here, we perform an analytic...

Université de Fribourg

Analysis of ground state in random bipartite matching

Shi, Gui-Yuan ; Kong, Yi-Xiu ; Liao, Hao ; Zhang, Yi-Cheng

In: Physica A: Statistical Mechanics and its Applications, 2016, vol. 444, p. 397–402

Bipartite matching problems emerge in many human social phenomena. In this paper, we study the ground state of the Gale–Shapley model, which is the most popular bipartite matching model. We apply the Kuhn–Munkres algorithm to compute the numerical ground state of the model. For the first time, we obtain the number of blocking pairs which is a measure of the system instability. We also show...

Université de Fribourg

Ranking nodes in growing networks: When PageRank fails

Mariani, Manuel Sebastian ; Medo, Matúš ; Zhang, Yi-Cheng

In: Scientific Reports, 2015, vol. 5, p. 16181

PageRank is arguably the most popular ranking algorithm which is being applied in real systems ranging from information to biological and infrastructure networks. Despite its outstanding popularity and broad use in different areas of science, the relation between the algorithm’s efficacy and properties of the network on which it acts has not yet been fully understood. We study here PageRank’s...

Université de Fribourg

Dynamics of social contagions with limited contact capacity

Wang, Wei ; Shu, Panpan ; Zhu, Yu-Xiao ; Tang, Ming ; Zhang, Yi-Cheng

In: Chaos: An Interdisciplinary Journal of Nonlinear Science, 2015, vol. 25, no. 10, p. 103102

Individuals are always limited by some inelastic resources, such as time and energy, which restrict them to dedicate to social interaction and limit their contact capacities. Contact capacity plays an important role in dynamics of social contagions, which so far has eluded theoretical analysis. In this paper, we first propose a non-Markovian model to understand the effects of contact capacity on...

Université de Fribourg

Statistical mechanics of competitive resource allocation using agent-based models

Chakraborti, Anirban ; Challet, Damien ; Chatterjee, Arnab ; Marsili, Matteo ; Zhang, Yi-Cheng ; Chakrabarti, Bikas K.

In: Physics Reports, 2015, vol. 552, p. 1–25

Demand outstrips available resources in most situations, which gives rise to competition, interaction and learning. In this article, we review a broad spectrum of multi-agent models of competition (El Farol Bar problem, Minority Game, Kolkata Paise Restaurant problem, Stable marriage problem, Parking space problem and others) and the methods used to understand them analytically. We emphasize the...