Browsing Working Papers by Author "Sinha, Ankur"
Now showing items 1-7 of 7
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Alternate second order conic programming reformulations for hub location with capacity selection under demand uncertainty
Dhyani, Sneha; Jayaswal, Sachin; Sinha, Ankur; Vidyarthi, Navneet (Indian Institute of Management Ahmedabad, 2018)In this paper, we study the single allocation hub location problem with capacity selection in the presence of congestion at hubs. Accounting for congestion at hubs leads to a non-linear mixed integer program, for which ... -
Alternate solution approaches for competitive hub location problems
Tiwari, Richa; Jayaswal, Sachin; Sinha, Ankur (Indian Institute of Management Ahmedabad, 2019)In this paper, we study the hub location problem of an entrant airline that tries to maximize its share in a market with already existing competing players. The problem is modelled as a nonlinear integer program, which ... -
Bilevel optimization: applications, models and solution approaches
Jayaswal, Sachin; Sinha, Ankur (Indian Institute of Management Ahmedabad, 2022-05-17)Bilevel optimization is a difficult class of optimization problems, which contain an inner optimization problem as a constraint to an outer optimization problem. Such optimization problems are commonly referred to as ... -
Buy, sell or hold: entity-aware classification of business news
Sinha, Ankur; Kedas, Satishwar; Kumar, Rishu; Malo, Pekka (2019-04-30)Financial sector is expected to be at the forefront of the adoption of machine learning methods, driven by the superior performance of the data-driven approaches over traditional modelling approaches. There has been a ... -
Competitive hub location problems: model and solution approaches
Tiwari, Richa; Jayaswal, Sachin; Sinha, Ankur (Indian Institute of Management Ahmedabad, 2019)In this paper, we study the hub location problem of an entrant airline that tries to maximize its market share, in a market with already existing competing players. The routes open for use can be either of multiple ... -
A general purpose exact solution method for mixed integer concave minimization problems (revised as on 12/08/2021)
Sinha, Ankur; Das, Arka; Anand, Guneshwar; Jayaswal, Sachin (Indian Institute of Management Ahmedabad, 2021-03-01)In this article, we discuss an exact algorithm for mixed integer concave minimization problems. A piece wise inner-approximation of the concave function is achieved using an auxiliary linear program that leads to a bilevel ... -
Hub interdiction & hub protection problems: Model formulations & exact solution methods
Ramamoorthy, Prasanna; Jayaswal, Sachin; Sinha, Ankur; Vidyarthi, Navneet (Indian Institute of Management Ahmedabad, 2016-10-25)In this paper, we present computationally effcient formulations for the hub interdiction and hub protection problems, which are bi-level and tri-level mixed integer linear programs, respec- tively. In the hub interdiction ...