共查询到20条相似文献,搜索用时 31 毫秒
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Andres Quiroz Nathan Gnanasambandam Manish Parashar Naveen Sharma 《Cluster computing》2009,12(1):73-85
We present a decentralized algorithm for online clustering analysis used for anomaly detection in self-monitoring distributed
systems. In particular, we demonstrate the monitoring of a network of printing devices that can perform the analysis without
the use of external computing resources (i.e. in-network analysis). We also show how to ensure the robustness of the algorithm,
in terms of anomaly detection accuracy, in the face of failures of the network infrastructure on which the algorithm runs.
Further, we evaluate the tradeoff in terms of overhead necessary for ensuring this robustness and present a method to reduce
this overhead while maintaining the detection accuracy of the algorithm.
相似文献
Naveen SharmaEmail: |
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Dispersed information diffusion with level and schema-based coordination in mobile peer to peer networks 总被引:1,自引:0,他引:1
Several open ended issues for high resource availability in mobile peer to peer networks have been examined in the recent
past. Different approaches were conducted for supporting information distribution and availability, through guided or unguided
packet diffusion. The majority of the recently proposed approaches try to benefit from the spatial characteristics of the
dynamically varying topologies. In this work a directed information diffusion scheme is examined using a level and schema-based
coordination, applied in mobile peer to peer networks. The prioritization degree of any requested advert is modeled and enables
directed prioritized diffusions to end mobile users that are traversing a certain geographic region (location based advertisements).
The proposed method is robust in disseminating redundant messages to users while maintaining connectivity through Gradual
Energy Tree-based (GET) configuration. Simulation is performed for the examination and performance evaluation of the proposed
scheme, taking into account the modeled prioritization as well as the diffusion accuracy by using the Hierarchical and Non-hierarchical
GET configuration.
相似文献
Helen D. KaratzaEmail: |
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Sub-Antarctic Marion Island has had a permanent research station for 50 years and the islands Wandering Albatrosses have been intensively studied for 20 years. The reactions of breeding birds to approaches by a human on foot were recorded. Three response variables were calculated: intensity of vocal reaction (IVR), intensity of non-vocal reaction (INR) and overall response index (ORI). At 5 m from the nest, twice as many birds stood and/or vocalised as at 15 m. Nearest neighbour distance, age and gender did not explain individual variability of responses. Study colony birds had higher IVR scores than non-study colony birds; birds at colonies closest to the station had the highest ORI scores. A better breeding record was associated with lower IVR and ORI scores, but a causative relationship remains to be demonstrated. A minimum viewing distance of 25 m is recommended for breeding Wandering Albatrosses.
相似文献
Marienne S. de VilliersEmail: Fax: +27-21-6503434 |
John CooperEmail: |
Peter G. RyanEmail: |
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Scheduling mixed-parallel applications with advance reservations 总被引:1,自引:0,他引:1
This paper investigates the scheduling of mixed-parallel applications, which exhibit both task and data parallelism, in advance
reservations settings. Both the problem of minimizing application turn-around time and that of meeting a deadline are studied.
For each several scheduling algorithms are proposed, some of which borrow ideas from previously published work in non-reservation
settings. Algorithms are compared in simulation over a wide range of application and reservation scenarios. The main finding
is that schedules computed using the previously published CPA algorithm can be adapted to advance reservation settings, notably
resulting in low resource consumption and thus high efficiency.
相似文献
Henri Casanova (Corresponding author)Email: |
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The recent contribution by Jarmila Kukalová-Peck on Hennigian phylogenetics and hexapod limb evolution is critically evaluated.
相似文献
Michael S. Engel (Corresponding author)Email: |
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Machado RR Lima Filho ES Jardim DF Ferreira MA de Faria CG Duarte RS Lesche B 《European biophysics journal : EBJ》2008,38(1):111-119
An interferometer that measures the refractive index changes due to bacterial metabolism is described. The apparatus permits
simultaneous and real time measurement of bacterial growth in several samples of slowly growing mycobacteria. The error sources
are discussed and the sensitivity of the apparatus is tested. For the species Mycobacterium bovis BCG and M. smegmatis, a relation between refractive index change and bacterial concentration is determined experimentally and the time constant
of bacterial growth is measured.
相似文献
B. LescheEmail: |
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Causal Explanation of Indonesian Forest Fires: Concepts, Applications, and Research Priorities 总被引:1,自引:0,他引:1
Andrew P. Vayda 《Human ecology: an interdisciplinary journal》2006,34(5):615-635
Problems with studies, claims, and assumptions that have been made about the causes of fires in Indonesia's tropical moist forests are identified, and the kinds of concepts, methods, prioritizing, and data needed to resolve the problems are discussed. Separate sections are devoted to studying ignitions, studying fire susceptibility and fire behavior, and using the goal of causal explanation to guide interdisciplinary research.
相似文献
Andrew P. VaydaEmail: |
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Stig S. Gezelius 《Human ecology: an interdisciplinary journal》2007,35(5):587-599
While economic literature inspired by the “tragedy of the commons” has emphasised people’s tendency to increase fishing effort
beyond desirable levels, sociologists and anthropologists who have studied the social aspects of fishing have often emphasised
the capacity of these factors to restrict fishing effort. The article addresses the influence of social norms and communication
on fishing effort in an empirical study of the Atlantic blue whiting fishery. The data were generated at a time when this
fishery had yet to see efficient quota regulations, and had been subject to a rapid growth in fishing effort, making it the
largest fishery in the Atlantic. The article argues that social norms and communication patterns in the fishing fleet create
a synergic effect of co-operation and competition on fishing effort. The article questions the view that social norms and
communication necessarily represent a solution to the tragedy of the commons.
相似文献
Stig S. GezeliusEmail: |
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Terry Harmer 《Cluster computing》2007,10(3):277-285
Gridcast is an R&D project investigating grid ideas and technologies in the broadcasting technical infrastructure. In this
paper I discuss the business and technical issues in building infrastructures to support broadcasters and outline the structure
of the Gridcast grid-based service oriented architecture for broadcasting playout support.
相似文献
Terry HarmerEmail: |
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Peter Godfrey-Smith 《Biology & philosophy》2007,22(3):429-437
Jablonka and Lamb's claim that evolutionary biology is undergoing a ‘revolution’ is queried. But the very concept of revolutionary
change has uncertain application to a field organized in the manner of contemporary biology. The explanatory primacy of sequence
properties is also discussed.
相似文献
Peter Godfrey-SmithEmail: |
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Rapid prototyping of distributed systems can be achieved by integrating commercial off-the-shelf (COTS) components. With components
as the building blocks, it is important to predict the performance of the system based on the performance of individual components.
In this paper, performance prediction of a system consisting of a small number of components is investigated under different
inter-component communication patterns, and the number of threads provided by components. Based on the experimental results,
it can be inferred that the proposed composition rules provide a reasonably accurate prediction of the performance of a system
made out of these components.
相似文献
Barrett R. BryantEmail: |
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A key point in the analysis of dynamical models of biological systems is to handle systems of relatively high dimensions.
In the present paper we propose a method to hierarchically organize a certain type of piecewise affine (PWA) differential
systems. This specific class of systems has been extensively studied for the past few years, as it provides a good framework
to model gene regulatory networks. The method, shown on several examples, allows a qualitative analysis of the asymptotic
behavior of a PWA system, decomposing it into several smaller subsystems. This technique, based on the well-known strongly
connected components decomposition, is not new. However, its adaptation to the non-smooth PWA differential equations turns
out to be quite relevant because of the strong discrete structure underlying these equations. Its biological relevance is
shown on a 7-dimensional PWA system modeling the gene network responsible for the carbon starvation response in Escherichia coli.
相似文献
Laurent Tournier (Corresponding author)Email: |
Jean-Luc GouzéEmail: |
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Joseph L. Arvai 《Tree Genetics & Genomes》2007,3(2):173-185
Risk communication involves three primary elements: process, content and intent. Much has been written about the first two.
Much is known, for example, about the guiding principles that should be considered during the design of a risk communication.
Likewise, many studies have been conducted about how best to establish the technical and informational content of a risk communication.
Very little attention, by contrast, has been devoted to the intent of risk communication, which is to inform decision making
for risk management. While appropriate information upon which to base risk management decisions is important, so to is an
understanding of how people instinctively approach decision making under conditions of risk. Work in the decision sciences
provides this often-missing perspective for many risk communication efforts and is, therefore, the focus of this paper.
相似文献
Joseph L. ArvaiEmail: |
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The competitiveness of online algorithms is measured based on the correctness of the results produced and processing time
efficiency. Traditionally evolutionary algorithms are not favored in online paradigms because of the large number of iterations
involved in the algorithm which translates directly into processing time overhead. In this paper we describe MARS (Management
Architecture for Resource Services) online scheduling algorithm which uses Simulated Annealing and concepts from Tabu Search
to drastically decrease the processing time of the algorithm. The paper outlines the concepts behind MARS, the components
involved and scheduling methodology used. In addition we also identify the time consuming bottlenecks in the performance of
the system and how evolutionary algorithms help us soar past them.
相似文献
Hesham El-RewiniEmail: |
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Threatened species and the spatial concentration of humans 总被引:1,自引:1,他引:0
Public policies that encourage high-density human living arrangements have been predicated explicitly on the assumption that
certain spatial distributions of a fixed-size human population are less environmentally damaging than others. We examine the
empirical validity of this assumption across 127 countries by analyzing whether the concentration of human presence in each
country is related statistically to the percentage of species that were on the IUCN Red List in 2004. Our findings indicate
that concentration of the human population is associated with reduced imperilment among amphibians but increased imperilment
among reptiles, and birds.
相似文献
Ram PanditEmail: |