7,575 research outputs found
Simulation of networks of spiking neurons: A review of tools and strategies
We review different aspects of the simulation of spiking neural networks. We
start by reviewing the different types of simulation strategies and algorithms
that are currently implemented. We next review the precision of those
simulation strategies, in particular in cases where plasticity depends on the
exact timing of the spikes. We overview different simulators and simulation
environments presently available (restricted to those freely available, open
source and documented). For each simulation tool, its advantages and pitfalls
are reviewed, with an aim to allow the reader to identify which simulator is
appropriate for a given task. Finally, we provide a series of benchmark
simulations of different types of networks of spiking neurons, including
Hodgkin-Huxley type, integrate-and-fire models, interacting with current-based
or conductance-based synapses, using clock-driven or event-driven integration
strategies. The same set of models are implemented on the different simulators,
and the codes are made available. The ultimate goal of this review is to
provide a resource to facilitate identifying the appropriate integration
strategy and simulation tool to use for a given modeling problem related to
spiking neural networks.Comment: 49 pages, 24 figures, 1 table; review article, Journal of
Computational Neuroscience, in press (2007
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Model-Driven Cyber Range Training: A Cyber Security Assurance Perspective
Security demands are increasing for all types of organisations, due to the ever-closer integration of computing infrastructures and smart devices into all aspects of the organisational operations. Consequently, the need for security-aware employees in every role of an organisation increases in accordance. Cyber Range training emerges as a promising solution, allowing employees to train in both realistic environments and scenarios and gaining hands-on experience in security aspects of varied complexity, depending on their role and level of expertise. To that end, this work introduces a model-driven approach for Cyber Range training that facilitates the generation of tailor-made training scenarios based on a comprehensive model-based description of the organisation and its security posture. Additionally, our approach facilitates the auto- mated deployment of such training environments, tailored to each defined scenario, through simulation and emulation means. To further highlight the usability of the proposed approach, this work also presents scenarios focusing on phishing threats, with increasing level of complexity and difficulty
Simulation of rapid loading systems in iron ore mines
In the mining industry, it is observed that sudden break-down of any equipment may stop the entire system, resulting in drastic production losses and enhancing the cost production. In this paper, the probability of sudden break down of each equipment are individually analyzed from their previous performances where the frequency of occurrences, duration and the time-interval of each breakdown has given an additional stress and the non-availability of that equipment on the entire system is discussed. Computerized best fit matching is found out for preventive maintenance of this equipment by developing different sub-routines and simulation models. Optimum utilization of those equipment shows a particular steady- state production from the mine.
Advanced technology is used for the operation of the open-pit mining. Hazard due to open cast mining is less than that of underground mines and the recent trend is to adopt the former one. For the mechanization, different types of machineries are used, such as shovel, dumper, dozer, drill machines, etc. use of more machineries increases the complexity of the operation and as a result it is very difficult to the proper matching of these equipment’s. As these machineries are very costly so unless they are properly matched, reduction in production cost is not possible. Sudden breakdown of one equipment may stop the production from whole mine. So it is needed to analyze the breakdown data by statistical approach to find out the possibility of breakdown of that particular equipment and ask for preventive maintenance. This analysis needed the help of computer for simulating the whole mining system to judge the performance of each equipment. This paper deals with the computerized best fit matching, for preventive maintenance of equipment
A Toolkit for Simulation of Desktop Grid Environment
Peer to Peers, clusters and grids enable a combination of heterogeneous distributed recourses to resolve problems in different fields such as science, engineering and commerce. Organizations within the world wide grid environment network are offering geographically distributed resources which are administrated by schedulers and policies. Studying the resources behavior is time consuming due to their unique behavior and uniqueness. In this type of environment it is nearly impossible to prove the effectiveness of a scheduling algorithm. Hence the main objective of this study is to develop a desktop grid simulator toolkit for measuring and modeling scheduler algorithm performance. The selected methodology for the application development is based on prototyping methodology. The prototypes will be developed using JAVA language united with a MySQL database. Core functionality of the simulator are job generation, volunteer generation, simulating algorithms, generating graphical charts and generating reports.
A simulator for desktop grid environment has been developed using Java as the implementation language due to its wide popularity. The final system has been developed after a successful delivery of two prototypes. Despite the implementation of the mentioned core functionalities of a desktop grid simulator, advanced features such as viewing real-time graphical charts, generating PDF reports of the simulation result and exporting the final result as CSV files has been also included among the other features
Design of teacher assistance tools in an exploratory learning environment for algebraic generalisation
The MiGen project is designing and developing an intelligent exploratory environment to support 11-14 year-old students in their learning of algebraic generalisation. Deployed within the classroom, the system also provides tools to assist teachers in monitoring students' activities and progress. This paper describes the architectural design of these Teacher Assistance tools and gives a detailed description of one such tool, focussing in particular on the research challenges faced, and the technologies and approaches chosen to implement the necessary functionalities given the context of the project
Comparative Study of Simulators for Vehicular Networks
Vehicular Adhoc networks (VANETs) are composed of vehicles connected with
wireless links to exchange data. VANETs have become the backbone of the
Intelligent Transportation Systems (ITS) in smart cities and enable many
essential services like roadside safety, traffic management, platooning, etc
with vehicle-to-vehicle (V2V) and vehicle-to-infrastructure (V2I)
communications. In any form of research testing and evaluation plays a crucial
role. However, in VANETs, real-world experiments require high investment, and
heavy resources and can cause many practical difficulties. Therefore,
simulations have become critical and the primary way of evaluating VANETs'
applications. Furthermore, the upfront challenge is the realistic capture of
the networking mechanism of VANETs, which varies from situation to situation.
Several factors may contribute to the successful achievement of a random
realistic networking behavior. However, the biggest dependency is a powerful
tool for the implementation, which could probably take into account all the
configuration parameters, loss factors, mobility schemes, and other key
features of a VANET, yet give out practical performance metrics with a good
trade-off between investment of resources and the results. Hence, the aim of
this research is to evaluate some simulators in the scope of VANETs with
respect to resource utilization, packet delivery, and computational time
An Empirical Survey on Co-simulation: Promising Standards, Challenges and Research Needs
Co-simulation is a promising approach for the modelling and simulation of
complex systems, that makes use of mature simulation tools in the respective
domains. It has been applied in wildly different domains, oftentimes without a
comprehensive study of the impact to the simulation results. As a consequence,
over the recent years, researchers have set out to understand the essential
challenges arising from the application of this technique. This paper
complements the existing surveys in that the social and empirical aspects were
addressed. More than 50 experts participated in a two-stage Delphi study to
determine current challenges, research needs and promising standards and tools.
Furthermore, an analysis of the strengths, weakness, opportunities and threats
of co-simulation utilizing the analytic hierarchy process resulting in a
SWOT-AHP analysis is presented. The empirical results of this study show that
experts consider the FMI standard to be the most promising standard for
continuous time, discrete event and hybrid co-simulation. The results of the
SWOT-AHP analysis indicate that factors related to strengths and opportunities
predominate
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