Technical Sessions – Monday July 11

TA-11 IFORS 2011 - Melbourne
3 - Increasing Stability and Flexibility of Vehicle and Crew
Schedules in Public Transport
Bastian Amberg, Information Systems, Freie Universitaet Berlin,
Garystr. 21, 14195, Berlin, Germany,
bastian.amberg@fu-berlin.de, Boris Amberg, Natalia Kliewer
In public bus transport delays occur frequently during execution of vehicle and
crew schedules. Then planned schedules can become infeasible and the operations
control has to initiate expensive recovery actions. We present offline
approaches to increase robustness of vehicle and crew schedules. In order
to absorb possible delays we propose models and methods increasing delaytolerance
(stability). Further we consider methods providing additional possibilities
for low-cost recovery actions within the schedules (flexibility). The
approaches are compared with regard to planned cost and robustness
4 - Incorporating Stability and Flexibility Aspects in Crew
and Aircraft Scheduling
Lucian Ionescu, Information Systems, Freie Universität Berlin,
Garystr. 21, 14195, Berlin, Germany,
Lucian.Ionescu@fu-berlin.de, Natalia Kliewer
In this talk we discuss robustness aspects of crew and aircraft schedules. The
scope of the talk is two-folded. In the first part we propose an indicator for
stability of crew and aircraft schedules based on a stochastic model for delay
propagation. In a second stage we discuss an extension of the approach by considering
swapping opportunities of crews and aircraft during operations. Swaps
are used to adhere to cost-efficient schedules while still hedging against possible
reactionary delays. This enables us to both consider stability and flexibility
simultaneously during scheduling.
� TA-11
Tuesday, 9:00-10:30
Meeting Room 112
Simulation Optimization
Stream: Simulation - Sponsored by I-SIM
Invited session
Chair: Loo Hay Lee, Industrial & Systems Engineering Dept.,
National University of Singapore, 10 Kent Ridge Crescent, 119260,
Singapore, iseleelh@nus.edu.sg
1 - Optimal Computing Budget Allocation (OCBA) Algorithm
for constraint and multi-objective problem
Loo Hay Lee, Industrial & Systems Engineering Dept., National
University of Singapore, 10 Kent Ridge Crescent, 119260,
Singapore, iseleelh@nus.edu.sg, Ek Peng Chew, Chun-Hung
Chen
In this talk, we will share some of the new development in OCBA. We have
developed algorithms for constraints optimization problem as well as multiobjective
problem. Correlation information between performance will be considered
in the algorithm.
2 - OCBA Framework for AHP in Supplier Selection Problem
Ek Peng Chew, Industrial and Systems Engineering, Faculty of
Engineering, National University of Singapore, 10 Kent Ridge
Crescent, 119260, Singapore, isecep@nus.edu.sg, Loo Hay Lee
In this work, we look at a supplier selection problem using Analytical Hierarchy
Process (AHP). However, as the information is clouded by a lot of uncertainty,
the solution generated by AHP might not be the best one. We propose an
optimal computing budget allocation (OCBA) framework to reduce the degree
of uncertainty in the information efficiently so that solution obtain will meet
the goal of the decision makers with high confidence.
3 - Augmenting Regression with Direct Stochastic Gradient
Estimates
Michael Fu, Smith School of Business, University of Maryland,
Van Munching Hall, 20742, College Park, MD, United States,
mfu@umd.edu, Huashuai Qu
In the sequential response surface methodology approach to simulation optimization,
regression plays a central role. Traditional regression assumes the
only data available are measurements of the dependent variable for each value
of the independent variable. We propose an augmented linear regression model
that incorporates direct stochastic gradient estimates, comparing it with the traditional
model both analytically and numerically on a simple queueing model.
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4 - Power Management in Buildings Facilitated by
Simulation-based Policy Improvement
Qing-Shan Jia, Department of Automation, Tsinghua University,
CFINS, 100084, Beijing, China, jiaqs@tsinghua.edu.cn,
Jian-Xiang Shen, Zhan-Bo Xu, Xiaohong Guan
Buildings are one of the largest consumers of energy, accounting for between
30-40% of global energy use. In this talk, we schedule solar power, wind power,
combined cooling, heating, and power generation (CCHP), battery, and high
temperature chiller to satisfy the load on electricity, sensible heat load, and latent
heat load in buildings with the minimal average cost. The rollout method
is applied to improve from given base policies through simulations. Numerical
results show that the method obtains policies better than the base policies.
� TA-12
Tuesday, 9:00-10:30
Meeting Room 205
Production Systems
Stream: Contributed Talks
Contributed session
Chair: Kazuyoshi Tsurusaki, Faculty of Economics, Nagasaki
University, 4-2-1 Katafuchi, 850-8506, Nagasaki, Japan,
turusaki@nagasaki-u.ac.jp
1 - A New Production Planning System by Advance Demand
Information Based on Unfulfilled-order-rate for
Uncertain Demand
Nobuyuki Ueno, Dept. of Management Information Systems,
Prefectural University of Hiroshima, 1-1-71 Ujina-Higashi,
Minami-Ku Hiroshima-City, 734-0003, Hiroshima, Japan,
ueno@pu-hiroshima.ac.jp, Koji Okuhara
We propose a production planning model with uncertain demand based on
unfulfilled-order-rate by Advance Demand Information. It is formulated as
a nonlinear stochastic problem which minimizes the sum of production cost
and inventory holding cost subject to a probabilistic constraint and linear constraints.
We develop the new upper bound to estimate unfulfilled-order-rate
when inventory in two periods is correlated and a near-optimal solution algorithm
on the basis of relaxation strategy. The technique decreases inventory
more than by base-stock policy with multi-period under the conditions.
2 - Simulation and Control of Shrinkages in the Ready Mix
Concrete Production Process
Fredy Huayta, Ingeniería Industrial, Pontificia Universidad
Católica del Perú, Av. Universitaria 1801, Lima, Peru,
fhuayta@pucp.edu.pe, Wilmer Atoche, Fernando Ormachea
Article shows the ready-mix concrete production process, which identifies the
shrinkage, generated in the unit operation. Monitoring indicators are identified
and shrinkage, are simulated using computational tools process. Also calculated
the economic losses generated by the shrinkage and the water wasted in
the process. The company analyzed processes 1000 tons per day, in which they
identify points of leakage, we measured the losses generated in the process,
were determined by mass balance calculations, was formulated and finally the
model simulated the losses of the unit operation.
3 - Proposed Improvements in Non Direct Process of a
Socks Company
José Rau, FCI, PUCP, Av. Universitaria 1851, Peru,
jrau@pucp.edu.pe
Improvements presented correspond to an average manufacturing plant, which
showed a low productivity of human and material resources. It were chosen and
described development in reduce consumption of energy resource and increase
productivity, progress in an air system to transport and carry on knitting and
innovation in improving the organization of work and material consumption.