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 Christos Alexopoulos

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Average citations per article4.24
Citation Count233
Publication count55
Publication years1988-2017
Available for download43
Average downloads per article180.58
Downloads (cumulative)7,765
Downloads (12 Months)169
Downloads (6 Weeks)25
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59 results found Export Results: bibtexendnoteacmrefcsv

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1
December 2018 WSC '18: Proceedings of the 2018 Winter Simulation Conference
Publisher: IEEE Press
Bibliometrics:
Citation Count: 0
Downloads (6 Weeks): 1,   Downloads (12 Months): 1,   Downloads (Overall): 1

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We survey recent developments concerning Sequest and Sequem, two simulation-based sequential procedures for estimating steady-state quantiles. These procedures deliver improved point and confidence-interval (CI) estimators of a selected steady-state quantile, where the CI approximately satisfies user-specified requirements on the CI's coverage probability and its absolute or relative precision. Sequest estimates ...

2
December 2018 WSC '18: Proceedings of the 2018 Winter Simulation Conference
Publisher: IEEE Press
Bibliometrics:
Citation Count: 0
Downloads (6 Weeks): 1,   Downloads (12 Months): 1,   Downloads (Overall): 1

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In a previous article, we studied a then-new class of standardized time series (STS) estimators for the asymptotic variance parameter of a stationary simulation output process. Those estimators invoke the well-known reflection principle of Brownian motion on the suitably standardized original output process to compute several "reflected" realizations of the ...

3
December 2017 WSC '17: Proceedings of the 2017 Winter Simulation Conference
Publisher: IEEE Press
Bibliometrics:
Citation Count: 0
Downloads (6 Weeks): 0,   Downloads (12 Months): 0,   Downloads (Overall): 0

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This paper and the corresponding panel session focus on teaching undergraduate industrial engineering/operations research-related simulation courses. The format brings together four experienced instructors to discuss four questions involving the structure and topic outlines of courses, print and software teaching materials used, and general teaching methods/philosophy. The hope is to provide ...

4
December 2017 WSC '17: Proceedings of the 2017 Winter Simulation Conference
Publisher: IEEE Press
Bibliometrics:
Citation Count: 0
Downloads (6 Weeks): 0,   Downloads (12 Months): 8,   Downloads (Overall): 8

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This paper offers a concise history of simulation output statistical analysis during the last six decades. Given the space limitations and historical perspective, we focus on the creation of the main concepts and methodologies that shaped the area, and proceed with a brief description of their developmental stages. We direct ...

5
December 2017 WSC '17: Proceedings of the 2017 Winter Simulation Conference
Publisher: IEEE Press
Bibliometrics:
Citation Count: 1
Downloads (6 Weeks): 0,   Downloads (12 Months): 9,   Downloads (Overall): 9

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In this paper we review the history of the Winter Simulation Conference (WSC) during 2008--2017, a period characterized by financial stability, continued growth, and inroads into the new age of simulation. In particular, we trace the modernization of the Conference as well as its expansion outside of the United States ...

6 published by ACM
November 2017 ACM Transactions on Modeling and Computer Simulation (TOMACS): Volume 27 Issue 4, December 2017
Publisher: ACM
Bibliometrics:
Citation Count: 2
Downloads (6 Weeks): 2,   Downloads (12 Months): 23,   Downloads (Overall): 59

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We present Sequem, a sequential procedure that delivers point and confidence-interval (CI) estimators for extreme steady-state quantiles of a simulation-generated process. Because it is specified completely, Sequem can be implemented directly and applied automatically. The method is an extension of the Sequest procedure developed by Alexopoulos et al. in 2014 ...
Keywords: Quantile estimation, maximum transformation method, method of batching, method of sectioning, sequential procedure, steady-state simulation

7 published by ACM
September 2017 ACM Transactions on Modeling and Computer Simulation (TOMACS): Volume 27 Issue 3, September 2017
Publisher: ACM
Bibliometrics:
Citation Count: 0
Downloads (6 Weeks): 0,   Downloads (12 Months): 8,   Downloads (Overall): 50

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The article “MNOPQRS: Max Nonnegativity Ordering—Piecewise-Quadratic Rate Smoothing” by Chen and Schmeiser constructs a smooth piecewise-quadratic rate estimate for a nonhomogeneuous Poisson process based on event counts over k adjacent time intervals. The event times can be generated by generating a Poisson process with unit rate and inverting the cumulative ...
Keywords: Nonhomogeneous poisson process, piecewise-quadratic smoothing, rate function

8
December 2015 WSC '15: Proceedings of the 2015 Winter Simulation Conference
Publisher: IEEE Press
Bibliometrics:
Citation Count: 0
Downloads (6 Weeks): 0,   Downloads (12 Months): 5,   Downloads (Overall): 5

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We develop new point estimators for the variance parameter of a steady-state simulation process. The estimators are based on jackknifed versions of nonoverlapping batch means, overlapping batch means, and standardized time series variance estimators. The new estimators have reduced bias---and can be manipulated to reduce their variance and mean-squared error---compared ...

9
December 2015 WSC '15: Proceedings of the 2015 Winter Simulation Conference
Publisher: IEEE Press
Bibliometrics:
Citation Count: 0
Downloads (6 Weeks): 0,   Downloads (12 Months): 6,   Downloads (Overall): 6

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This article presents Sequem, a fully sequential procedure for computing point estimators and confidence intervals (CIs) for extreme steady-state quantiles of a simulation output process. The method is an enhancement of the Sequest procedure proposed by Alexopoulos et al. in 2014 for estimating nonextreme steady-state quantiles. Sequem exploits a combination ...

10
December 2014 WSC '14: Proceedings of the 2014 Winter Simulation Conference
Publisher: IEEE Press
Bibliometrics:
Citation Count: 3
Downloads (6 Weeks): 1,   Downloads (12 Months): 3,   Downloads (Overall): 12

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Sequest is a fully sequential procedure that delivers improved point and confidence-interval (CI) estimators for a designated steady-state quantile by exploiting a combination of ideas from batching and sectioning. Sequest incorporates effective methods to do the following: (a) eliminate bias in the sectioning-based point estimator that is caused by initialization ...

11
December 2013 WSC '13: Proceedings of the 2013 Winter Simulation Conference: Simulation: Making Decisions in a Complex World
Publisher: IEEE Press
Bibliometrics:
Citation Count: 0
Downloads (6 Weeks): 1,   Downloads (12 Months): 1,   Downloads (Overall): 11

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Ad hoc distributed simulation, a methodology for embedded online simulation, has been studied for the steady-state simulation of open queueing networks. However, for most online simulation applications, the capability of a simulation approach to respond to system dynamics is at least as important as the performance in steady-state analysis. Hence, ...

12
December 2013 WSC '13: Proceedings of the 2013 Winter Simulation Conference: Simulation: Making Decisions in a Complex World
Publisher: IEEE Press
Bibliometrics:
Citation Count: 3
Downloads (6 Weeks): 1,   Downloads (12 Months): 3,   Downloads (Overall): 11

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We propose SPSTS, an automated sequential procedure for computing point and confidence-interval (CI) estimators for the steady-state mean of a simulation output process. This procedure is based on variance estimators computed from standardized time series, and it is characterized by its simplicity relative to methods based on batch means and ...

13
January 2013 INFORMS Journal on Computing: Volume 25 Issue 1, Winter 2013
Publisher: INFORMS
Bibliometrics:
Citation Count: 0

The replicated batch means RBM method for steady-state simulation output analysis generalizes both the independent replications IR and batch means BM methods. We analyze the performance of RBM in situations where the underlying stochastic process possesses an additive initial transient. Our analysis differs from prior work in that the initial ...
Keywords: independent replications, variance estimation, batch means, replicated batch means, initialization bias

14
December 2012 WSC '12: Proceedings of the Winter Simulation Conference
Publisher: Winter Simulation Conference
Bibliometrics:
Citation Count: 4
Downloads (6 Weeks): 1,   Downloads (12 Months): 1,   Downloads (Overall): 31

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We study asymptotically valid confidence intervals (CIs) for steady-state quantiles computed from nonoverlapping batches. Asymptotic validity of the CIs is established under conditions that are weaker and more easily verifiable than the usual mixing assumptions. The performance of the CIs is evaluated with a preliminary experimental study. These results form ...

15
August 2012 Computers and Industrial Engineering: Volume 63 Issue 1, August, 2012
Publisher: Pergamon Press, Inc.
Bibliometrics:
Citation Count: 0

Generally, the derivation of an inventory policy requires the knowledge of the underlying demand distribution. Unfortunately, in many settings demand is not completely observable in a direct way or inventory records may be inaccurate. A variety of factors, including the potential inaccuracy of inventory records, motivate managers to seek replenishment ...
Keywords: Power Approximation method, Batch-ordering inventory policy, Inventory inaccuracies

16
July 2012 Simulation: Volume 88 Issue 7, July 2012
Publisher: Society for Computer Simulation International
Bibliometrics:
Citation Count: 2

Ad hoc distributed simulation is an approach to predicting future states of operational systems. It is based on embedding online simulations into a sensor network and adding communication and synchronization among the simulators. While prior work focused on this approach in the context of online management of transportation systems, this ...
Keywords: tools and technology, distributed interactive simulation, queueing systems, theory and methodology

17
December 2011 WSC '11: Proceedings of the Winter Simulation Conference
Publisher: Winter Simulation Conference
Bibliometrics:
Citation Count: 1
Downloads (6 Weeks): 0,   Downloads (12 Months): 2,   Downloads (Overall): 16

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Given an output process generated by a steady-state simulation, we give expressions for the mean-squared error (MSE) of several well-known estimators of the associated variance parameter. The variance estimators are based on the method of nonoverlapping batch means and on the method of standardized time series applied to overlapping batch ...

18
December 2011 WSC '11: Proceedings of the Winter Simulation Conference
Publisher: Winter Simulation Conference
Bibliometrics:
Citation Count: 1
Downloads (6 Weeks): 1,   Downloads (12 Months): 6,   Downloads (Overall): 28

Full text available: PDFPDF
Output analysis methods that provide reliable point and confidence-interval estimators for system performance characteristics are critical elements of any modern simulation project. Remarkable advances in simulation output analysis have been achieved over the last thirty years, in part owing to the application of data-reuse techniques designed to improve estimator accuracy ...

19
December 2011 WSC '11: Proceedings of the Winter Simulation Conference
Publisher: Winter Simulation Conference
Bibliometrics:
Citation Count: 1
Downloads (6 Weeks): 0,   Downloads (12 Months): 0,   Downloads (Overall): 12

Full text available: PDFPDF
An ad hoc distributed simulation is a collection of online simulators embedded in a sensor network that communicate and synchronize among themselves. Each simulator is driven by sensor data and state predictions from other simulators. Previous work has examined this approach in transportation systems and queueing networks. Ad hoc distributed ...

20
June 2011 PADS '11: Proceedings of the 2011 IEEE Workshop on Principles of Advanced and Distributed Simulation
Publisher: IEEE Computer Society
Bibliometrics:
Citation Count: 1
Downloads (6 Weeks): 0,   Downloads (12 Months): 0,   Downloads (Overall): 24

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Ad hoc distributed simulations are constructed by embedding online simulations into a network of sensors. Recent work examining the effectiveness of ad hoc distributed simulations in modeling open queueing networks has been limited to a specific network configuration. This paper examines the accuracy of the ad hoc approach more broadly ...



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