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Networks in life: scaling properties and eigenvalue spectra

Farkas, I; Derényi, I; Jeong, H; Néda, Z; Oltvai, Z.N; … - In: Physica A: Statistical Mechanics and its Applications 314 (2002) 1, pp. 25-34

We analyze growing networks ranging from collaboration graphs of scientists to the network of similarities defined among the various transcriptional profiles of living cells. For the explicit demonstration of the scale-free nature and hierarchical organization of these graphs, a deterministic...

Persistent link: https://www.econbiz.de/10011057642

Subgraph centrality and clustering in complex hyper-networks

Estrada, Ernesto; Rodríguez-Velázquez, Juan A. - In: Physica A: Statistical Mechanics and its Applications 364 (2006) C, pp. 581-594

The representation of complex systems as networks is inappropriate for the study of certain problems. We show several examples of social, biological, ecological and technological systems where the use of complex networks gives very limited information about the structure of the system....

Persistent link: https://www.econbiz.de/10011058801

A simpler characterization of a spectral lower bound on the clique number

Yıldırım, E. - In: Computational Statistics 71 (2010) 2, pp. 267-281

Given a simple, undirected graph G, Budinich (Discret Appl Math 127:535–543, 2003) proposed a lower bound on the clique number of G by combining the quadratic programming formulation of the clique number due to Motzkin and Straus (Can J Math 17:533–540, 1965) with the spectral decomposition...

Persistent link: https://www.econbiz.de/10010847781

Universal Adjacency Matrices with Two Eigenvalues

Haemers, W.H.; Omidi, G.R. - Tilburg University, Center for Economic Research - 2010

AMS Mathematics Subject Classification: 05C50.

Persistent link: https://www.econbiz.de/10011091063

Seidel Switching and Graph Energy

Haemers, W.H. - Tilburg University, Center for Economic Research - 2012

Abstract: The energy of a graph Γ is the sum of the absolute values of the eigenvalues of the adjacency matrix of Γ. Seidel switching is an operation on the edge set of Γ. In some special cases Seidel switching does not change the spectrum, and therefore the energy. Here we investigate when...

Persistent link: https://www.econbiz.de/10011091312

A simpler characterization of a spectral lower bound on the clique number

Yıldırım, E. - In: Mathematical Methods of Operations Research 71 (2010) 2, pp. 267-281

Persistent link: https://www.econbiz.de/10010999801

The young professional

Parker, Lee - In: Accounting, Auditing & Accountability Journal 17 (2004) 4

Persistent link: https://www.econbiz.de/10014641730

Bridging the gap between different statistical approaches: An integrated framework for modelling

Kuhnert, PM; Mengersen, K; Tesar, P - 2003

variables. The second encompasses a two step modelling process, where the use of non-parametric methods such as decision trees …

Persistent link: https://www.econbiz.de/10009448036

Characteristics of birch trees which influence Yellow-bellied Sapsucker (Sphyrapicus varius varius) feeding activity.

Nelson, Chris - 1991

-bellied Sapsuckers (Sphyrapicus varius varius). Previous studies suggest that sapsuckers preferentially select larger birch trees (>20 cm … dbh) as feeding trees. I tested whether large birch trees were being selected as feeding trees through sapwell frequency … measures. I also collected birch phloem sap samples from 11 different trees to find if variability existed between different …

Persistent link: https://www.econbiz.de/10009476996

Selection of technical risk responses for efficient contingencies

Kujawski, Edouard - 2008

risks and RRAs are characterized using scenarios, decision trees, and cumulative probability distributions. The analysis …

Persistent link: https://www.econbiz.de/10009435988