2,741 research outputs found
Complex network classification using partially self-avoiding deterministic walks
Complex networks have attracted increasing interest from various fields of
science. It has been demonstrated that each complex network model presents
specific topological structures which characterize its connectivity and
dynamics. Complex network classification rely on the use of representative
measurements that model topological structures. Although there are a large
number of measurements, most of them are correlated. To overcome this
limitation, this paper presents a new measurement for complex network
classification based on partially self-avoiding walks. We validate the
measurement on a data set composed by 40.000 complex networks of four
well-known models. Our results indicate that the proposed measurement improves
correct classification of networks compared to the traditional ones
Non-L\'evy mobility patterns of Mexican Me'Phaa peasants searching for fuelwood
We measured mobility patterns that describe walking trajectories of
individual Me'Phaa peasants searching and collecting fuelwood in the forests of
"La Monta\~na de Guerrero" in Mexico. These one-day excursions typically follow
a mixed pattern of nearly-constant steps when individuals displace from their
homes towards potential collecting sites and a mixed pattern of steps of
different lengths when actually searching for fallen wood in the forest.
Displacements in the searching phase seem not to be compatible with L\'evy
flights described by power-laws with optimal scaling exponents. These findings
however can be interpreted in the light of deterministic searching on heavily
degraded landscapes where the interaction of the individuals with their scarce
environment produces alternative searching strategies than the expected L\'evy
flights. These results have important implications for future management and
restoration of degraded forests and the improvement of the ecological services
they may provide to their inhabitants.Comment: 15 pages, 4 figures. First version submitted to Human Ecology. The
final publication will be available at http://www.springerlink.co
Texture descriptor combining fractal dimension and artificial crawlers
Texture is an important visual attribute used to describe images. There are
many methods available for texture analysis. However, they do not capture the
details richness of the image surface. In this paper, we propose a new method
to describe textures using the artificial crawler model. This model assumes
that each agent can interact with the environment and each other. Since this
swarm system alone does not achieve a good discrimination, we developed a new
method to increase the discriminatory power of artificial crawlers, together
with the fractal dimension theory. Here, we estimated the fractal dimension by
the Bouligand-Minkowski method due to its precision in quantifying structural
properties of images. We validate our method on two texture datasets and the
experimental results reveal that our method leads to highly discriminative
textural features. The results indicate that our method can be used in
different texture applications.Comment: 12 pages 9 figures. Paper in press: Physica A: Statistical Mechanics
and its Application
THE EFFECT OF TERRORISM ON TOURISM: EVIDENCE FROM TURKEY
The aim of this study is to investigate the effects of terrorism and other factors on Turkey’s tourism sector using unit root tests for known structural break points. We found that the tourist arrivals series is trend stationary with known structural break points. For the case of Turkey, there are two separate periods of terrorism which statistically have a meaningful negative effect on tourist arrivals. However, considering the trend stationary, these effects are transitory rather than being permanent.The Scientific and Technological Research Council of Turkey with the project number: 106K09
Using deterministic tourist walk as a small-world metric on Watts-Strogatz networks
The Watts-Strogatz model (WS) has been demonstrated to effectively describe
real-world networks due to its ability to reproduce the small-world properties
commonly observed in a variety of systems, including social networks, computer
networks, biochemical reactions, and neural networks. As the presence of
small-world properties is a prevalent characteristic in many real-world
networks, the measurement of "small-worldness" has become a crucial metric in
the field of network science, leading to the development of various methods for
its assessment over the past two decades. In contrast, the deterministic
tourist walk (DTW) method has emerged as a prominent technique for texture
analysis and network classification. In this paper, we propose the use of a
modified version of the DTW method to classify networks into three categories:
regular networks, random networks, and small-world networks. Additionally, we
construct a small-world metric, denoted by the coefficient , from the DTW
method. Results indicate that the proposed method demonstrates excellent
performance in the task of network classification, achieving over
accuracy. Furthermore, the results obtained using the coefficient on
real-world networks provide evidence that the proposed method effectively
serves as a satisfactory small-world metric.Comment: 9 pages, 4 figure
Different approaches to community detection
A precise definition of what constitutes a community in networks has remained
elusive. Consequently, network scientists have compared community detection
algorithms on benchmark networks with a particular form of community structure
and classified them based on the mathematical techniques they employ. However,
this comparison can be misleading because apparent similarities in their
mathematical machinery can disguise different reasons for why we would want to
employ community detection in the first place. Here we provide a focused review
of these different motivations that underpin community detection. This
problem-driven classification is useful in applied network science, where it is
important to select an appropriate algorithm for the given purpose. Moreover,
highlighting the different approaches to community detection also delineates
the many lines of research and points out open directions and avenues for
future research.Comment: 14 pages, 2 figures. Written as a chapter for forthcoming Advances in
network clustering and blockmodeling, and based on an extended version of The
many facets of community detection in complex networks, Appl. Netw. Sci. 2: 4
(2017) by the same author
Popular music as cultural heritage: scoping out the field of practice
This paper sets out to deepen our understanding of the relationship between
popular music and cultural heritage and to delineate the practices of popular
music as cultural heritage. The paper illustrates how the term has been mobilised
by a variety of actors, from the public to the private sector, to highlight
the value of particular popular music manifestations and justify or encourage
their preservation and diffusion for posterity. We focus on Austria, England,
France and the Netherlands – countries with diverse popular music histories and
with varying national and international reach. Popular music heritage is present
in national and local public sector heritage institutions and practices in a number
of ways. These range from the preservation and exhibition of the material culture
of heritage in museums and archives, to a variety of ‘bottom-up’ initiatives,
delineating a rich landscape of emblematic places, valued for their attachment to
particular musicians or music scenes. The paper points to an underlying tension
between the adoption and replication of conventional heritage practices to the
preservation and remembrance of the popular music and its celebration as an
express
Utility of behavioural science in landscape architecture: investigating the application of environment-behaviour theory and its research methods to fit the spatial agenda of design
This thesis attempts to address the behavioural science /design `applicability gap'
problem currently concerning professional academics and researchers in landscape
architecture and related disciplines. Building on research carried out by others, it
attempts to gain further insight into the nature of the problem, how the gap
specifically relates to landscape design, how it manifests itself in the design process,
and how the problem might realistically be addressed.
It is argued that in order to address the gap problem in landscape architecture, it is
also necessary to address the wider problem of the lack of communication and
understanding between research and design spheres. Therefore, the study is
conducted from a combined research/design perspective.
A critical review of the literature combined with project driven reflection -in- action
analysis establishes a lack of compatibility of environment- behaviour theory, and its
research methods, with the landscape designer's spatial approach. It is argued that
there is a need for theory- building to facilitate the practical application of integrated
spatial -behaviour analysis. As a result, a framework of spatial/behavioural
compatible theories and concepts, and a set of practical tools and techniques, are
conceptualised, and their application explored, for site survey analysis. The utility of
the approach is demonstrated for embodying user needs evaluation within the design
process and for providing a method for contextualising research. Finally, a shift in
thinking is envisaged in which research and design approaches are reconciled
"Worlds of reason: the praxis of accounting for 'day visitor' behaviour in the Peak National Park" a qualititative investigation
SIGLEAvailable from British Library Document Supply Centre-DSC:DXN039331 / BLDSC - British Library Document Supply CentreGBUnited Kingdo
A Walk as Act / Enact / Re-enactment: Performing Psychogeography and Anthropology
This book’s keywords of re-enactment, replication and reconstruction pose a distinction between an original on the one hand and some kind of copy on the other. The practice of walking and everyday life in general suggest alternatives. Using the series of terms ‘act’, ‘enact’ and ‘re-enactment’, the chapter investigates creativity in ways that cannot be reduced to the dichotomy of original and copy. It begins with an account of some pedagogical experiments into walking and psychogeography, and then explores the act of walking in psychogeography. It moves on to the enactment of shared practice between psychogeography and anthropology, and finally the re-enactment of psychogeography as anthropology, and vice versa
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