Simulation (Computer Science)

Comparing overlapping batch means and standardized time series under multiple replications in parallel

by Edjair Mota

The Measurement and Modeling of a P2P Streaming Video Service

by Yehia El-khatib

Learning Efficiencies Using Multi-Agent Based Game Simulations

by Barry Lee Reynolds

Barker, G., Reynolds, B.L., Lao, A. C-C., & Wu, F. (2008). Learning Efficiencies Using Multi-Agent Based Game Simulations. Proc. of 2008 International Conference on Computers in Education (pp. 737-741). Jhongli: Asia-Pacific Society for Computers in Education.

Learning effectiveness is a function of effective pedagogical practices. Accordingly, the question for learning... more Learning effectiveness is a function of effective pedagogical practices. Accordingly, the question for learning technology designers should be “What combination of instructional strategies and delivery media will best produce the desired learning outcome for the intended audience?" This paper reviews four successful products that incorporate solid instructional strategies with agent based game simulations to provide a positive learning environment for students.

A sketch-based system for highway design with user-specified regions of influence

by Christopher Applegate

Authors: C. S. Applegate, S. D. Laycock and A. M. Day. Published in: Computers & Graphics, Volume 36, Issue 6, October 2012, Pages 685-695, ISSN 0097-8493, 10.1016/j.cag.2012.03.033.

Paper:
- http://dx.doi.org/10.1016/j.cag.2012.03.033

Video:
- http://youtu.be/CrFHVncLKos

To create traffic simulations of high visual-fidelity, each component part needs to be designed and modelled in great... more To create traffic simulations of high visual-fidelity, each component part needs to be designed and modelled in great detail. Roads can be created manually, but this can become a time-consuming and laborious process when modelling large-scale networks. Therefore, automated techniques for generating road networks efficiently and effectively, is highly desirable in both urban-planning and entertainment industries. In this paper we present a novel sketch-based tool to semi-automate the design, creation, and visualisation of road networks across both flat and undulating terrains. Our tool is guided by input sketches and a combination of prioritised constraints, including the curvature of roads, their inclination, and the volume of ground that would be displaced during construction. We introduce ‘Influence Regions’ which are user-specified areas of the terrain that influence the path of the roads generated, and are used to attract or repel roads to/from certain obstacles or designated areas, such as forestation, listed buildings, marshland, etc. A user study is conducted to evaluate the usability of the system and the quality of roads generated in a diverse range of scenarios. The results indicate that our system is both user-friendly and able to produce roads that are true to the user's intention.

Living in the Past and Looking Toward the Future Archaeologists develop models to explain agricultural history, future.

by Isaac Ullah

An editorial about MedLanD project research by Chris Gorski for "Inside Science"

El cultivo del maíz y su impacto regional: Agotamiento de los suelos en el corredor de La Venta, Jalisco

by Christopher Beekman

Beekman, Christopher S. and William W. Baden. In press. El cultivo del maíz y su impacto regional: Agotamiento de los suelos en el corredor de La Venta, Jalisco. In Patrones de asentamiento y actividades de subsistencia en el Occidente de México, Reconocimiento a la Dra. Helen P. Pollard, edited by Eduardo Williams and Phil C. Weigand, pp. x-x. Colegio de Michoacán, Zamora.

Methods of Batch Means in Simulation Output Analysis under Multiple Replications in Parallel

by Edjair Mota

We are interested in the development of a methodology for automated stochastic simulation. In this paper we present... more We are interested in the development of a methodology for automated stochastic simulation. In this paper we present our research activities on studying properties of distributed estimators that can be used in Akaroa-2, a user friendly package for running distributed quantitative stochastic simulation, that implements a very interesting way of exploiting parallel computing power called Multiple Replications in Parallel). Many methodological statistical issues are still open. The estimation problem in simulation is nontrivial because the output process is usually highly correlated. Thus, to apply the classical statistical analysis for constructing a confidence interval for the mean one needs to transform the output sequence in such a way that the new process is approximately uncorrelated. Due to its popularity and simplicity of conception, we found interesting investigating sequential confidence interval procedures based on the Batch Means method. Each procedure is described and experimental results of their performance are presented as well.

Upstream traffic management in EPONs: a simulation based analysis

by annie gravey

This short paper was presented in 2008 at Simutools '08, 1st international conference on Simulation tools and techniques for communications, networks and systems

An access network architecture using Passive Optical Net- works (PON) with Dynamic Bandwidth Allocation (DBA) is... more An access network architecture using Passive Optical Net- works (PON) with Dynamic Bandwidth Allocation (DBA) is currently considered to be one of the most promising so- lutions to meet increasing traffic demands. Upstream traffic management in PONs is fairly complex, which implies using simulation methods to assess its effectiveness. This paper presents the characteristics of a generic simulation platform that is currently developed in our team to evaluate the per- formance characteristics of PONs DBAs and to assess the efficiency of their QoS support.

Agent-based simulation validation: A case study in demographic simulation

by Cristina Montañola Sales

Conference Proceeding: 01/2011; In proceeding of: The Third International Conference on Advances in System Simulation SIMUL

Two of the crucial parts in the process of performing a simulation study are validation and verification. The reason... more Two of the crucial parts in the process of performing a simulation study are validation and verification. The reason is these techniques help on increasing the confidence in
the model, since it is not possible to demonstrate its absolute validity in all contexts. This paper presents the results of a white-box validation performed in an agent-based simulator for population dynamics. The tool provides a way to simulate the demographic evolution of large populations in a parallel environment. The purpose is to obtain population projections that can be used afterwards for policy analysis. Although the
tool has been studied in terms of performance and scalability, its validation hasn’t been addressed. With a white-box validation we expect to increase the confidence of policy analysers and social scientists in our simulation model.

Performance Analysis of Parallel Demographic Simulation

by Cristina Montañola Sales

Conference Proceeding: 01/2010; In proceeding of: Proceedings of the 24th European Simulation and Modelling Conference (ESM10)

Today, we have seen an increase in the number of papers on parallel simulation applications outside the traditional... more Today, we have seen an increase in the number of papers on parallel simulation applications outside the traditional military and network simulations areas, such as in the physical science and management science. One of the new areas in which parallel simulation could be used is demography, specifically for population projection. In this paper, we report the performance evaluation results of a parallel demographic simulation tool called Yades. We investigate the effect of three factors: unbalanced workload, heterogeneous processing speed and heterogeneous communication latency on performance measures such as: time spent in executing useful events, time spent for overhead and the number of rollbacks. The results are consistent with what has been reported in other application areas of parallel simulation. Since the application in demography is new, it is useful to quantify the effect of the three factors on performance.

The Effects of Computer Simulations On Students’ Success and Attitudes in Teaching Chemistry

by Halil Eksi

Hüsamettin AKÇAY, Burak FEYZ‹O⁄LU,Cengiz TÜYSÜZ
Educational Sciences: Theory & Practice
3 (1) • May›s / May 2003 • 20-26

An important progress in computer technology and software has been realized
in recent years and using of the... more An important progress in computer technology and software has been realized
in recent years and using of the computer in education increased as well as. The
computer-based education (CBE) has been enriched using simulation and
animation. The aim of this study is to carry out the effect of computer
simulation and animation on the students’ success on chemistry subject and
attitudes of students into chemistry. A computer-based learning packet
concerning solutions is prepared for this purpose. The following tests were
applied as pretest before teaching solution chemistry by conventional and
computer-based packet: Achievement test, logical thinking ability test, chemistry
attitudes scale, computer attitudes scale, and simulation attitudes scale. The
study was carried out during 2001-2002 school period with 84 high school
students between ages 15 and 18 of 10th grade. The students were divided into
two groups as Control Group (KG) and Experimental Group (DG) and were
taught using conventional and computer based approaches, respectively.
According to p= 0,05 understanding significance the results indicated that the
experimental group students’ attitudes to computer, to chemistry and to
simulations show a significant and positive change due to students’ control
groups. It’s the same with their success toward chemistry.

Estimating maximum bite performance in Tyrannosaurus rex using multi-body dynamics

by Peter Falkingham

Bates, K. T., and Falkingham, P. L.

Bite mechanics and feeding behaviour in Tyrannosaurus rex are controversial. Some contend that a modest bite... more Bite mechanics and feeding behaviour in Tyrannosaurus rex are controversial. Some contend that a modest bite mechanically limited T. rex to scavenging, while others argue that high bite forces facilitated a predatory mode of life. We use dynamic musculoskeletal models to simulate maximal biting in T. rex. Models predict that adult T. rex generated sustained bite forces of 35 000–57 000 N at a single posterior tooth, by far the highest bite forces estimated for any terrestrial animal. Scaling analyses suggest that adult T. rex had a strong bite for its body size, and that bite performance increased allometrically during ontogeny. Positive allometry in bite performance during growth may have facilitated an ontogenetic change in feeding behaviour in T. rex, associated with an expansion of prey range in adults to include the largest contemporaneous animals.

Network Models For Glassy Dynamics

by Prasanta Pal

Reactive Behaviours in Primordial Soup

by Jayanth Kannan

Looking for the Future in the Past: Long-Term Change in Socioecological Systems

by Isaac Ullah

Accepted for publication by Ecological Modeling, Feb., 2012.

Authors: C. Michael Barton, Isaac I.T. Ullah, Sean M. Bergin, Helena Mitasova, and Hessam Sarjoughian

This paper is now available as a pre-press online release at the Ec-Mod website: http://dx.doi.org/10.1016/j.ecolmodel.2012.02.010

The archaeological record has been described as a key to the long-term consequences of human action that can help... more The archaeological record has been described as a key to the long-term consequences of human action that can help guide our decisions today. Yet the sparse and incomplete nature of this record often makes it impossible to inferentially reconstruct past societies in sufficient detail for them to serve as more than very general cautionary tales of coupled socio-ecological systems. However, when formal and computational modeling is used to experimentally simulate human socioecological dynamics, the empirical archaeological record can be used to validate and improve dynamic models of long term change. In this way, knowledge generated by archaeology can play a unique and valuable role in developing the tools to make more informed decisions that will shape our future. The Mediterranean Landscape Dynamics project offers an example of using the past to develop and test computational models of interactions between land-use and landscape evolution that ultimately may help guide decision-making.

Refining the Business Case for Sustainable Energy Projects Using Palisade @RISK and PrecisionTree: A Biofuel Plant Case Study (PRESENTATION) - SARK7

by Scott Mongeau

Presented at 2011 Palisade Europe Risk Conference in Amsterdam
Refining the Business Case for
Sustainable Energy Projects Using
Palisade @RISK and PrecisionTree:
A Biofuel Plant Case Study

Overview
1. Profitable sustainable energy projects
2. Palisade as facilitating tool
3. Biofuel project... more Overview
1. Profitable sustainable energy projects
2. Palisade as facilitating tool
3. Biofuel project as example

• Examples using Palisade Decision Suite

• Economic phenomenon
– Drive to marginal optimality
– Perverse incentives
– ‘The tragedy of the commons’ and free-riders
• Sustainability project characteristics
– Marginally profitable
– Highly sensitive
– Requires systemic engineering / optimization
• Coordinated management of systemic complexity
– Core NPV variance analysis
– Profitable systemic market scenarios
• Leadership gap:
– Transcend politics and sentiment
– Need for market-based solutions

Towards realistic models of wireless workload

by Stefan Karpinski

Wireless traffic: the failure of CBR modeling

by Stefan Karpinski

Towards Realistic Models of Wireless Workload, IEEE

by Stefan Karpinski

Modeling Hypotheses in Pompeian Archaeology: The House of the Faun

by Ethan Gruber

Published in the proceedings for Computer Applications and Quantitative Methods in Archaeology, held in Granada, Spain, April 2010. Co-authored with John Dobbins.

The archaeologically accepted plan of the House of the Faun at Pompeii serves as the basis for an initial 3D computer... more The archaeologically accepted plan of the House of the Faun at Pompeii serves as the basis for an initial 3D computer model that employs a simulated lighting script to render the lighting conditions of interior spaces at different times of the year. The model reveals that the Alexander Mosaic, lifted in 1843 and moved to the Museo Nazionale in Naples, was apparently never seen under optimum lighting conditions in its original setting. The problem is solved by providing a new interpretation of modifications made to the colonnades associated with the mosaic and then reconfiguring the model accordingly. The result is a new reconstruction of the architectural setting of the Alexander Mosaic and a new understanding of its original lighting conditions.