Search for: associated-costs
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    Aircraft performance optimization using fish-like locomotion

    , Article AIAA Atmospheric Flight Mechanics Conference and Exhibit ; 2008 ; 9781563479458 (ISBN) Pourtakdoust, S. H ; Mortazavi, S. H ; Sharif University of Technology
    American Institute of Aeronautics and Astronautics Inc  2008
    In this article, an optimal maneuver structure is proposed to improve the cruise fuel consumption performance of a transport category aircraft. The maneuver is taken by analogy to the natural phenomena of fish movement in the water. By using fish-like locomotion and implementing it on a transport category aircraft, better performance economy has been realized in cruise flight. The maneuver structure and the required control actions are extracted using optimal control theory. The power required during a specified cruise time span is taken as the merit function in the optimal control formulation. The cost savings associated with this type of optimized periodic maneuver during cruise is... 

    Assessing impact of demand response in emission-constrained environments

    , Article IEEE Power and Energy Society General Meeting, 24 July 2011 through 28 July 2011, Detroit, MI ; 2011 ; 19449925 (ISSN) ; 9781457710018 (ISBN) Parvania, M ; Fotuhi Firuzabad, M ; Shahidehpour, M ; Sharif University of Technology
    Reducing the emissions produced by the electric power production may be one of the most challenging problems of the electricity sector in the coming future. As one of the potential solutions, demand response (DR) can play an important role to reduce emissions and costs associated with emission reduction activities. This paper aims to assess the short-term impacts of running a DR program on a power system constrained by emissions caps. The DR program is designed to procure operating reserve from demand-side participants. A day-ahead network-constrained market clearing model with emission cap constraints is used as the assessment tool, where the DR program participants along with generating... 

    From loss allocation to loss cost allocation: a comparative study of different loss cost allocation methods

    , Article International Transactions on Electrical Energy Systems ; Volume 23, Issue 4 , 2013 , Pages 586-600 ; 20507038 (ISSN) Ghofrani Jahromi, Z ; Ehsan, M ; Fotuhi Firuzabad, M ; Parvania, M ; Sharif University of Technology
    As a high proportion of the total generated electricity energy and the power system costs is due to the power losses in lines, allocating the loss and associated cost to the system loads and generating units is a substantial issue in deregulated power systems. The procedure to accomplish this cost allocation is designated as 'loss cost allocation' (LCA). So far, a number of LCA methods have been proposed for transmission networks. A few papers have compared different loss allocation methods, which are the methods which calculate the loss (and not necessarily the loss cost) allocated to the loads and generating units. However, this paper presents a comparative study of LCA methods. In this... 

    Dictionary learning with low mutual coherence constraint

    , Article Neurocomputing ; Volume 407 , 2020 , Pages 163-174 Sadeghi, M ; Babaie Zadeh, M ; Sharif University of Technology
    Elsevier B.V  2020
    This paper presents efficient algorithms for learning low-coherence dictionaries. First, a new algorithm based on proximal methods is proposed to solve the dictionary learning (DL) problem regularized with the mutual coherence of dictionary. This is unlike the previous approaches that solve a regularized problem where an approximate incoherence promoting term, instead of the mutual coherence, is used to encourage low-coherency. Then, a new solver is proposed for constrained low-coherence DL problem, i.e., a DL problem with an explicit constraint on the mutual coherence of the dictionary. As opposed to current methods, which follow a suboptimal two-step approach, the new algorithm directly... 

    Demand response scheduling by stochastic SCUC

    , Article IEEE Transactions on Smart Grid ; Volume 1, Issue 1 , May , 2010 , Pages 89-98 ; 19493053 (ISSN) Parvania, M ; Fotuhi Firuzabad, M ; Sharif University of Technology
    Considerable developments in the real-time telemetry of demand-side systems allow independent system operators (ISOs) to use reserves provided by demand response (DR) in ancillary service markets. Currently, many ISOs have designed programs to utilize the reserve provided by DR in electricity markets. This paper presents a stochastic model to schedule reserves provided by DR in the wholesale electricity markets. Demand-side reserve is supplied by demand response providers (DRPs), which have the responsibility of aggregating and managing customer responses. A mixed-integer representation of reserve provided by DRPs and its associated cost function are used in the proposed stochastic model....