📃 Phase Transitions in Community Detection and Clustering
Cristopher Moore, Santa Fe Institute

tuvalu.santafe.edu/events/workshops/images/b/b4/Csss16-networks.pdf

💡 Information and links to courses related to Complex Systems:

https://www.complexityexplorer.org/explore/syllabi

💡Resources for Complex Systems:

https://www.complexityexplorer.org/explore/resources

📽 32 Video Lectures:
Natural Computation and Self-Organization: The Physics of Information Processing in Complex Systems

https://www.youtube.com/playlist?list=PL4JWtHLBcsYelD-4hJRYL4g521H3Sp3ll

#سلسله_سمینارهای_هفتگی گروه سیستم های پیچیده شهید بهشتی
علاقه مندان می توانند برای ارائه موضوعات خود به ادمین پیام داده یا به صورت حضوری در جلسه مطرح نمایند.
@onmjnl

کلیدواژه ها:
#سیستم_پیچیده ، #بحران_مالی، #نظریه_اطلاعات، #آنتروپی_انتقال، #مدل_گرافیکی، #دینامیک_غیرخطی

🔵 https://agilience.com/en/document/en3495e91e51c2ffd16980244cdc99a383c650ab83

🔵 Complex systems Winter School 2017:
Early Registration Deadline on Nov. 2

http://necsi.edu/education/school.html

📝 Social Network Analysis Reveals Potential Fission-Fusion Behavior in a Shark

Danielle E. Haulsee, Dewayne A. Fox[…]Matthew J. Oliver

📌Abstract
Complex social networks and behaviors are difficult to observe for free-living marine species, especially those that move great distances. Using implanted acoustic transceivers to study the inter- and intraspecific interactions of sand tiger sharks Carcharias taurus, we observed group behavior that has historically been associated with higher order mammals. We found evidence strongly suggestive of fission-fusion behavior, or changes in group size and composition of sand tigers, related to five behavioral modes (summering, south migration, community bottleneck, dispersal, north migration). Our study shows sexually dimorphic behavior during migration, in addition to presenting evidence of a potential solitary phase for these typically gregarious sharks. Sand tigers spent up to 95 consecutive and 335 cumulative hours together, with the strongest relationships occurring between males. Species that exhibit fission-fusion group dynamics pose a particularly challenging issue for conservation and management because changes in group size and composition affect population estimates and amplify anthropogenic impacts.

http://www.nature.com/articles/srep34087

Wanna do PhD on the Internet in "best university of the world"? Apply by Jan-20

http://www.ox.ac.uk/admissions/graduate/courses/dphil-information-communication-and-social-sciences

📽 https://www.youtube.com/shared?ci=otyBaoOnmj0

📝 Encoding Temporal Markov Dynamics in Graph for Time Series Visualization

https://arxiv.org/abs/1610.07273

📌ABSTRACT:
Time series is attracting more attention across statistics, machine learning and pattern recognition as it appears widely in both industry and academia, but few advances has been achieved in effective time series visualization due to its temporal dimensionality and complex dynamics. Inspired by recent effort on using network metrics to characterize time series for classification, we present an approach to visualize time series as complex networks based on first order Markov process and temporal ordering. Different to classical bar charts, line plots and other statistics based graph, our approach delivers more intuitive visualization that better preserves both the temporal dependency and frequency structures. It provides a natural inverse operation to map the graph back to time series, making it possible to use graph statistics to characterize time series for better visual exploration and statistical analysis. Our experimental results suggest the effectiveness on various tasks such as system identification, classification and anomaly detection on both synthetic and the real time series data.

What is your field of study?

Physics, MS – 21
👍👍👍👍👍👍👍 53%

Physics, BS – 7
👍👍 18%

Other – 6
👍👍 15%

Physics, PhD – 2
👍 5%

Biology – 2
👍 5%

I am a professor of Physics. – 1
▫️ 3%

Not a professor or a student! – 1
▫️ 3%

Mathematics
▫️ 0%

Economy
▫️ 0%

👥 40 people voted so far. Poll closed.

📝 Estimating the Size of a Large Network and its Communities from a Random Sample

Lin Chen, Amin Karbasi, Forrest W. Crawford

https://arxiv.org/pdf/1610.08473v1

📌 ABSTRACT:
Most real-world networks are too large to be measured or studied directly and there is substantial interest in estimating global network properties from smaller sub-samples. One of the most important global properties is the number of vertices/nodes in the network. Estimating the number of vertices in a large network is a major challenge in computer science, epidemiology, demography, and intelligence analysis. In this paper we consider a population random graph G = (V;E) from the stochastic block model (SBM) with K communities/blocks. A sample is obtained by randomly choosing a subset W and letting G(W) be the induced subgraph in G of the vertices in W. In addition to G(W), we observe the total degree of each sampled vertex and its block membership. Given this partial information, we propose an efficient PopULation Size Estimation algorithm, called PULSE, that correctly estimates the size of the whole population as well as the size of each community. To support our theoretical analysis, we perform an exhaustive set of experiments to study the effects of sample size, K, and SBM model parameters on the accuracy of the estimates. The experimental results also demonstrate that PULSE significantly outperforms a widely-used method called the network scale-up estimator in a wide variety of scenarios. We conclude with extensions and directions for future work.

🖥 NetworkX is a Python language software package for studying networks.

http://networkx.github.io/

🔴 علم بارپرست‌گونه:
ملاحظاتی در علم، شبه‌علم و یادگیری اینکه چگونه خود را فریب ندهیم.

سخنرانی ریچارد #فاینمن به مناسبت جشن فارغ‌التحصیلی - #کلتک ۱۹۷۴

http://www.sitpor.org/2016/04/cargo-cult-science/

#Cargo_Cult_Science , #sitpor

🔵 https://www.quantamagazine.org/20161025-pairwise-gene-removal-reveals-genetic-structure/

📝 Percolation in real multiplex networks

Ginestra Bianconi, Filippo Radicchi

https://arxiv.org/pdf/1610.08708v1

(Submitted on 27 Oct 2016)

📌 ABSTRACT
We present an exact mathematical framework able to describe site-percolation transitions in real multiplex networks. Specifically, we consider the average percolation diagram valid over an infinite number of random configurations where nodes are present in the system with given probability. The approach relies on the locally treelike ansatz, so that it is expected to accurately reproduce the true percolation diagram of sparse multiplex networks with negligible number of short loops. The performance of our theory is tested in social, biological, and transportation multiplex graphs. When compared against previously introduced methods, we observe improvements in the prediction of the percolation diagrams in all networks analyzed. Results from our method confirm previous claims about the robustness of real multiplex networks, in the sense that the average connectedness of the system does not exhibit any significant abrupt change as its individual components are randomly destroyed.

#سلسله_سمینارهای_هفتگی گروه سیستم های پیچیده شهید بهشتی
علاقه مندان می توانند برای ارائه موضوعات خود به ادمین پیام داده یا به صورت حضوری در جلسه مطرح نمایند.
@onmjnl

کلیدواژه ها:
#فیزیک_اجتماع ، #نظریه_تعادلی ، #دینامیک_شبکه ، #عضو_پیشرو