Planning and scheduling are activities of major economic importance. Among various planning and scheduling problems, this paper focuses on the scheduling of crude oil and petroleum derivatives in ports: the jetty sche...
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ISBN:
(纸本)9780816910229
Planning and scheduling are activities of major economic importance. Among various planning and scheduling problems, this paper focuses on the scheduling of crude oil and petroleum derivatives in ports: the jetty scheduling problem. The problem has combinatorial (allocation, sorting) and nonlinear (product blending) aspects, and multi-objective goals (minimization of different costs). We consider problems composed by tankers, tanks, pipelines, and jetties. Simulation models have been used as basis for this formulation. Moreover, real-life instances of the problem are of large scale and, if one wants to solve them in the daily operation of a harbor, they must be solved within minutes in common computer stations. This article proposes an original approach based on a continuous nonlinear optimal control model, without integer (binary) decision variables, which can reduce the problem's size. Numerical experiments are presented using efficient NLP methods, such as LSGRG2, MINOS, and SNOPT.
Moving horizon estimation for discrete-time nonlinear systems is addressed by using fast optimization algorithms for which stability results under general conditions are ensured. The solution of the on-line moving hor...
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In this paper, the authors introduce an exotic financial hedging tool in order to replicate interruption: load supply contracts. This derivative tool should guarantee the ISO the possibility of using interruptible res...
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A sufficient condition for robust stability of nonlinear constrained Model Predictive Control (MPC) with respect to plant/model mismatch is derived. This work is an extension of a previous study on the unconstrained n...
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Correct deployment of objects over a set of computing resources has a great impact on the performance of a distributed software. In this paper an Integer Non-Linear programming (INLP) object deployment approach which ...
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Diversity maintains security by making the computing en- vironment less standard and less predictable. Recent studies show that many randomization techniques, e.g. address space layout randomization (ASLR) significant...
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ISBN:
(纸本)9781450316873
Diversity maintains security by making the computing en- vironment less standard and less predictable. Recent studies show that many randomization techniques, e.g. address space layout randomization (ASLR) significantly enhance system security simply through reducing the number of re- turn to libc exploits [14]. However, \diversity" may incur significant overhead on the computing platforms. We study the problem of implementing diversity to trade off security performance with diversity implementation costs. We ad- dress this problem by formulating it as a partially observable Markov decision process (POMDP). An optimal solution considering a fixed amount of history can be obtained by transforming the POMDP optimization problem into a nonlinear programming (NLP) problem. Simulation results for a set of benchmark problems illustrate the effectiveness of the proposed method. Copyright 2012 ACM.
Obesity is a non-communicable disease that has a major impact on people’s health, increasing the risk of other chronic diseases such as diabetes, hypertension, and cardiovascular problems. Usually, the nutritional st...
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In this paper, we provide some new necessary and sufficient conditions for pseudoconvexity and semistrict quasiconvexity of a given proper extended real-valued function in terms of the Clarke-Rockafellar subdifferenti...
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This paper presents an application of cutting plane method to the non linear programming problem of the optimisation of the design of a cantilever retaining wall. The application of this technique in optimising the ca...
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The potential of solid-propellant two-pulse motors with variable interpulse time period for range extension of air-to-air missiles by thrust profile optimization, has been studied. One-dimensional coaltitude flight tr...
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