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planning-problem
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A milp model for incorporating reliability indices in distribution system expansion planning
, Article IEEE Transactions on Power Systems ; Volume 34, Issue 3 , 2019 , Pages 2453-2456 ; 08858950 (ISSN) ; Abbaspour, A ; Fotuhi-Firuzabad, M ; Farzin, H ; Moeini-Aghtaie, M ; Lehtonen, M ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2019
Abstract
Reliability cost is considered as an inevitable criterion in expansion planning studies of distribution systems. However, nonlinear expressions of reliability indices aggravate complexity of planning studies. To address this issue, this letter proposes a novel method to linearize mathematical model of the reliability-based distribution expansion planning problem. Using this variant of reliability indices, reliability costs can easily be involved in mixed-integer linear programming model of distribution expansion planning. Validity of the derived expressions is tested by simulation results. © 1969-2012 IEEE
Integration of symmetry and macro-operators in planning
, Article 6th Mexican International Conference on Artificial Intelligence, MICAI 2007, Aguascalientes, 4 November 2007 through 10 November 2007 ; Volume 4827 LNAI , 2007 , Pages 1056-1066 ; 03029743 (ISSN); 9783540766308 (ISBN) ; Ghassem Sani, G ; Nakhost, H ; Sharif University of Technology
Springer Verlag
2007
Abstract
Macro-operators are sequences of actions that can guide a planner to achieve its goals faster by avoiding search for those sequences. However, using macro-operators will also increase the branching factor of choosing operators, and as a result making planning more complex and less efficient. On the other hand, the detection and exploitation of symmetric structures in planning problems can reduce the search space by directing the search process. In this paper, we present a new method for detecting symmetric objects through subgraph-isomorphism, and exploiting the extracted information in macrooperator selection. The method has been incorporated into HSP2, and tested on a collection of...
Production planning problem with pricing under random yield: CVAR criterion [electronic resource]
, Article Journal of Systems Science and Systems Engineering ; 2014 ; Eshghi, Kourosh ; Modarres Yazdi, Mohammad ; Bahramgiri, Mohsen ; Sharif University of Technology
Abstract
In this paper, we address a basic production planning problem with price dependent demand and stochastic yield of production. We use price and target quantity as decision variables to lower the risk of low yield. The value of risk control becomes more important especially for products with short life cycle. This is because, the profit implications of low yield might be unbearable in the short run. We apply Conditional Value at Risk (CVaR) to model the risk. CVaR measure is a coherent risk measure and thereby having nice conceptual and mathematical underpinnings. It is also widely used in practice. We consider the problem under general demand function and general distribution function of...
Production planning problem with pricing under random yield: CVaR criterion
, Article Journal of Systems Science and Systems Engineering ; Vol. 23, issue. 3 , 2014 , p. 312-328 ; Eshghi, K ; Modarres Yazdi, M ; Bahramgiri, M ; Sharif University of Technology
Abstract
In this paper, we address a basic production planning problem with price dependent demand and stochastic yield of production. We use price and target quantity as decision variables to lower the risk of low yield. The value of risk control becomes more important especially for products with short life cycle. This is because, the profit implications of low yield might be unbearable in the short run. We apply Conditional Value at Risk (CVaR) to model the risk. CVaR measure is a coherent risk measure and thereby having nice conceptual and mathematical underpinnings. It is also widely used in practice. We consider the problem under general demand function and general distribution function of...
Exponential stabilisation of periodic orbits for running of a three-dimensional monopedal robot
, Article IET Control Theory and Applications ; Volume 5, Issue 11 , August , 2011 , Pages 1304-1320 ; 17518644 (ISSN) ; Sadati, N ; Gruver, W. A ; Dumont, G A ; Sharif University of Technology
2011
Abstract
This study presents a motion planning algorithm to generate a feasible periodic solution for a hybrid system describing running by a three-dimensional (3-D), three-link, three-actuator, monopedal robot. In order to obtain a symmetric running gait along a straight line, the hybrid system consists of two stance phases and two flight phases. The motion planning algorithm is developed on the basis of a finite-dimensional optimisation problem with equality and inequality constraints. By extending the concept of hybrid zero dynamics to running, the authors propose a time-invariant control scheme that is employed at two levels to locally exponentially stabilise the generated periodic solution for...