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Search Results: 1 - 10 of 6452 matches for " Anthony Longjas "
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Agent-based model of competition in a social structure
Erika Fille Legara,Anthony Longjas,Rene Batac
Physics , 2008,
Abstract: Indirect competition emerged from the complex organization of human societies, and knowledge of the existing network topology may aid in developing effective strategies for success. Here, we propose an agent-based model of competition with systems co-existing in a `small-world' social network. We show that within the range of parameter values obtained from the model and empirical data, the network evolution is highly dependent on $k$, the local parameter describing the density of neighbors in the network. The model applied to language death and competition of telecommunication companies show strong correspondence with empirical data.
Transport and Vulnerability in River Deltas: A Graph-Theoretic Approach
Alejandro Tejedor,Anthony Longjas,Ilya Zaliapin,Efi Foufoula-Georgiou
Physics , 2014,
Abstract: Maintaining a sustainable socio-ecological state of a river delta requires delivery of material and energy fluxes to its body and coastal zone in a way that avoids malnourishment that would compromise system integrity. We present a quantitative framework for studying delta topology and transport based on representation of a deltaic system by a rooted directed acyclic graph. Applying results from spectral graph theory allows systematic identification of the upstream and downstream subnetworks for a given vertex, computing steady flux propagation in the network, and finding partition of the flow at any channel among the downstream channels. We use this framework to construct vulnerability maps that quantify the relative change of sediment and water delivery to the shoreline outlets in response to possible perturbations in hundreds of upstream links. This enables us to evaluate which links hotspots and what management scenarios would most influence flux delivery to the outlets. The results can be used to examine local or spatially distributed delta interventions and develop a system approach to delta management.
Network robustness assessed within a dual connectivity perspective
Alejandro Tejedor,Anthony Longjas,Ilya Zaliapin,Samuel Ambroj,Efi Foufoula-Georgiou
Computer Science , 2014,
Abstract: Network robustness against attacks has been widely studied in fields as diverse as the Internet, power grids and human societies. Typically, in these studies, robustness is assessed only in terms of the connectivity of the nodes unaffected by the attack. Here we put forward the idea that the connectivity of the affected nodes can play a crucial role in properly evaluating the overall network robustness and its future recovery from the attack. Specifically, we propose a dual perspective approach wherein at any instant in the network evolution under attack, two distinct networks are defined: (i) the Active Network (AN) composed of the unaffected nodes and (ii) the Idle Network (IN) composed of the affected nodes. The proposed robustness metric considers both the efficiency of destroying the AN and the efficiency of building-up the IN. We show, via analysis of both prototype networks and real world data, that trade-offs between the efficiency of Active and Idle network dynamics give rise to surprising crossovers and re-ranking of different attack strategies, pointing to significant implications for decision making.
Avalanche Statistics of Driven Granular Slides in a Miniature Mound
D. E. Juanico,A. Longjas,R. Batac,C. Monterola
Physics , 2008, DOI: 10.1029/2008GL035567
Abstract: We examine avalanche statistics of rain- and vibration-driven granular slides in miniature sand mounds. A crossover from power-law to non power-law avalanche-size statistics is demonstrated as a generic driving rate $\nu$ is increased. For slowly-driven mounds, the tail of the avalanche-size distribution is a power-law with exponent $-1.97\pm 0.31$, reasonably close to the value previously reported for landslide volumes. The interevent occurrence times are also analyzed for slowly-driven mounds; its distribution exhibits a power-law with exponent $-2.670\pm 0.001$.
A Review of the Impact of Requirements on Software Project Development Using a Control Theoretic Model  [PDF]
Anthony White
Journal of Software Engineering and Applications (JSEA) , 2010, DOI: 10.4236/jsea.2010.39099
Abstract: Software projects have a low success rate in terms of reliability, meeting due dates and working within assigned budgets with only 16% of projects being considered fully successful while Capers Jones has estimated that such projects only have a success rate of 65%. Many of these failures can be attributed to changes in requirements as the project progresses. This paper reviews several System Dynamics models from the literature and analyses the model of Andersson and Karlsson, showing that this model is uncontrollable and unobservable. This leads to a number of is-sues that need to be addressed in requirements acquisition.
A Cayman Islands Perspective on Transborder Insolvencies and Bankruptcies: The Case for Judicial Co-Operation  [PDF]
Anthony Smellie
Beijing Law Review (BLR) , 2011, DOI: 10.4236/blr.2011.24015
Abstract: The freedom of movement of capital in the modern global economy has been indispensable to the development of international corporate enterprise. This paper argues that the judicial and legal institutions of states are as essential to the stability of the global economy as the traditionally heralded international economic channels that have been so carefully crafted globally. In fact, in the sphere of trans-border insolvency and bankruptcy, judicial and legal institutions could be perceived as even more vital, as the vibrancy and the health of global enterprises can be radically challenged and even severely impeded should countries fail to institute universally accepted legislative and judicial codes of practices. The quest for this normative approach has found expression by the United Nations in its development of the UNCITRAL Model Law, a prototype which has since been adopted by twenty-two States. A number of other States, as well, have adopted measures which mirror the cooperation and co-ordination principles of the UNCITRAL Model Law These States all accept that legislative and judicial capacity and competence are essential ingredients in the salutary infusion of mutual confidence, and it is this very shared trust that is the ultimate catalyst for successful resolution of cross-border and other disputes. For Offshore Financial Centres (OFCs), reinforcement of confidence in their Courts in the international arena is perhaps even more highly critical to their sustained roles in today’s globalized economy. This paper outlines the legislative and judicial competencies and roles that have enabled the Cayman Islands, as an example of a key OFC, to emerge as a major player in international cross-border conflict resolution. This discourse also acknowledges the hurdles OFCs have had to overcome in both perceptions and reality in the global marketplace and the increased pressures faced by Courts today in meeting demands of public policy objectives. With specific regard to the Cayman Islands as an example of an effectively functioning OFC, the paper examines the Islands’ insolvency regime, reviews a number of cases demonstrating the efficacy of the approach of the Islands’ Courts, and highlights relevant Cayman Islands’ legislation and orders made pursuant to those laws. This analysis demonstrates how, by implementing through its Courts a public policy model on a par with international codes of conduct, the territory has vouchsafed its ability to render the kind of international judicial assistance that is critical to the fulfilment of the tenets of the
Food and Nutrition Sciences—Open Special Issues: Public Health Nutrition Initiatives  [PDF]
Anthony Fardet
Food and Nutrition Sciences (FNS) , 2013, DOI: 10.4236/fns.2013.410A001
Abstract:

Food and Nutrition Sciences—Open Special Issues: Public Health Nutrition Initiatives


Relating models of activity metabolism to the metabolic efficiency of steady swimming  [PDF]
Anthony Papadopoulos
Open Journal of Animal Sciences (OJAS) , 2013, DOI: 10.4236/ojas.2013.34047
Abstract:

Power-law ( \"\") and exponential power-law ( \"\") functional forms model activity metabolism ( \"\") for fully submerged swimming animals, and are special cases of the power-law polynomial equation, \"\"

in which   is the observed total metabolic rate measured at an observed steady swimming speed,  . The relationship between the metabolic efficiency of steady swimming and the exponents of   is addressed in this paper to establish the use of   (\"\") and   (\"\") as optimal efficiencies for comparing the hydrodynamic and muscle metabolic efficiencies among fully submerged animals that engage in steady swimming activities. The metabolic efficiency of steady swimming is transformed into its ideal form (\"\" ) from which    the optimal hydrodynamic efficiency (\"\" ) and the optimal muscle metabolic efficiency (\"\" ) are derived. These optimal efficiencies are therefore ideal metabolic efficiencies measured at different optimal steady speeds.

Qualitative System Dynamics as a Tool in Accessible Design  [PDF]
Anthony S. White
Journal of Software Engineering and Applications (JSEA) , 2011, DOI: 10.4236/jsea.2011.41008
Abstract: A description of the Systems Dynamics paradigm is given and the reduced Qualitative System Dynamics (QSD) form explained. A simple example is given to illustrate the diagram construction. The principles of states (levels), rates and feedback loops are outlined. The QSD method is used to address the problem of accessibility by using human control of automation as an example, and applying the QSD method to evaluate the effects of the researcher and user in the de- sign of an accessible artefact. This simple automation model illustrates what can be found out from such a picture, in this indicating how the feedback from users has an influence on the time to deliver such designs.
Moving towards Personalized Geospatial Queries  [PDF]
Giorgos Mountrakis, Anthony Stefanidis
Journal of Geographic Information System (JGIS) , 2011, DOI: 10.4236/jgis.2011.34031
Abstract: Geospatial datasets are typically available as distributed collections contributed by various government or commercial providers. Supporting the diverse needs of various users that may be accessing the same dataset for different applications remains a challenging issue. In order to overcome this challenge there is a clear need to develop the capabilities to take into account complicated patterns of preference describing user and/or application particularities, and use these patterns to rank query results in terms of suitability. This paper offers a demonstration on how intelligent systems can assist geospatial queries to improve retrieval accuracy by customizing results based on preference patterns. We outline the particularities of the geospatial domain and present our method and its application.
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