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A new DEA ranking system based on changing the reference set

• Gholam Reza Jahanshahloo, Hélcio Vieira, F. Hosseinzadeh Lotfi, Darush Akbarian
• European Journal of Operational Research
• 2007

This research proposes a new ranking system for extreme efficient DMUs (Decision Making Units) based upon the omission of these efficient DMUs from reference set of the inefficient DMUs. We state and… (More)

Fish consumption recommendations to conform to current advice in regard to mercury intake.

• Hélcio Vieira, Felisbela Morgado, A. M. Soares, Silkha Abreu
• Environmental science and pollution research…
• 2015

This article reviews fish consumption data, mercury tolerable intake values, and mercury (Hg) content in fish, based on several reports from the Food and Agriculture Organization and European Union.… (More)

Improved efficient, nearly orthogonal, nearly balanced mixed designs

• Hélcio Vieira, Susan M. Sanchez, Karl Heinz Kienitz, Mischel Carmen Neyra Belderrain
• Proceedings of the 2011 Winter Simulation…
• 2011

Designed experiments are powerful ways to gain insights into the behavior of complex simulation models. In recent years, many new designs have been created to address the large number of factors and… (More)

Efficient, nearly orthogonal-and-balanced, mixed designs: an effective way to conduct trade-off analyses via simulation

• Hélcio Vieira, Susan M. Sanchez, Karl Heinz Kienitz, Mischel Carmen Neyra Belderrain
• J. Simulation
• 2013

A restricted multinomial hybrid selection procedure

• Hélcio Vieira, Susan M. Sanchez, Paul J. Sanchez, Karl Heinz Kienitz, Mischel Carmen Neyra Belderrain
• ACM Trans. Model. Comput. Simul.
• 2014

Analysts using simulation models often must assess a large number of alternatives in order to determine which are most effective. If effectiveness corresponds to the likelihood of yielding the best… (More)

Multinomial Selection Problem: A Study of BEM and AVC Algorithms

• Hélcio Vieira, Karl Heinz Kienitz, Mischel Carmen Neyra Belderrain
• Communications in Statistics - Simulation and…
• 2010

The purpose of this paper is to present a study of two Multinomial Selection Problem (MSP) procedures: BEM and AVC. This work focuses on MSP applied to Simulation Optimization problems. MSP is… (More)

A WIN-WIN approach to multiple objective linear programming problems

• Hélcio Vieira, Marcos Pereira Estellita Lins
• JORS
• 2009

Optimizing Stochastic Functions Using a Genetic Algorithm: An Aeronautic Military Application

• Hélcio Vieira
• Advances in Metaheuristics for Hard Optimization
• 2008

Real and Potential Mercury Accumulation in Human Scalp of Adolescents: A Case Study

• Hélcio Vieira, Felisbela Morgado, A. M. Soares, Silkha Abreu
• Biological Trace Element Research
• 2014

Mercury (Hg) concentration in human hair is used to estimate methylmercury (MeHg) exposure and establish a reference dose for MeHg intake. In this study, Hg accumulation and MeHg intake were… (More)

Discrete-valued, stochastic-constrained simulation optimization with COMPASS

• Hélcio Vieira, Karl Heinz Kienitz, Mischel Carmen Neyra Belderrain
• Proceedings of the 2011 Winter Simulation…
• 2011

We propose an improvement in the random search algorithm called COMPASS to allow it to deal with a single stochastic constraint. Our algorithm builds on two ideas: (a) a novel simulation allocation… (More)

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