Browsing by Author "Sinha, Ankur"

Now showing items 1-20 of 43

    • Accounting for political opinions, power, and influence: a voting advice application 

      Sinha, Ankur; Pajala, Tommi; Korhonen, Pekka; Wallenius, Jyrki; Dehnokhalaji, Akram (Elsevier, 2017-09-27)
      Voting Advice Applications (VAAs) are online decision support systems that try to match voters with po- litical parties or candidates in elections, typically based on how each responds to a ...

    • 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 ...

    • Alternate solution approaches for competitive hub location problems 

      Tiwari, Richa; Jayaswal, Sachin; Sinha, Ankur (European Journal of Operational Research, 2020-08-08)
      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 modeled as a non-linear integer program, which is ...

    • Approximated set-valued mapping approach for handling multiobjective bilevel problems 

      Sinha, Ankur; Malo, P.; Deb, K. (Elsevier Ltd, 2017)
      A significant amount of research has been done on bilevel optimization problems both in the realm of classical and evolutionary optimization. However, the multiobjective extensions of bilevel programming have received ...

    • Bilevel optimization based on iterative approximation of multiple mappings 

      Sinha, Ankur; Lu, Zhichao; Deb, Kalyanmoy; Malo, Pekka (Journal of Heuristics, 2020)
      A large number of application problems involve two levels of optimization, where one optimization task is nested inside the other. These problems are known as bilevel optimization problems and have been studied by both ...

    • A bilevel optimization formulation for the setting of minimum required maintenance margins in stock exchanges 

      Yayavaram, Anish Pratik; Sandeep, Nagamalla Sai (Indian Institute of Management Ahmedabad, 2020)
      This report addresses a hierarchical margin setting decision problem. There are two decision makers, namely, the stock exchange and the investor. The stock exchange, which is the leader in the hierarchical process, controls ...

    • 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 ...

    • Capacitated multiple allocation hub location problems under the risk of interdiction: model formulations and solution approaches 

      Bansal, Vishal; Jayaswal, Sachin; Sinha, Ankur (Springer Nature, 2023-08-31)
      Hub-and-spoke networks play a critical role in reducing cost and enhancing service levels in various infrastructural sectors since hubs act as the consolidation and transshipment points of the flows. The failure of hubs ...

    • The capacitated r-hub interdiction problem with congestion: Models and solution approaches 

      Bhatt, Sneha Dhyani; Sinha, Ankur; Jayaswal, Sachin (Elsevier, 2024-03-27)
      We study the r-hub interdiction problem under the case of possible congestion. Hub interdiction problems are modeled as attacker-defender problems to identify a set of r critical hubs from a set of p hubs, which when ...

    • Competitive hub location problem 

      Tiwari, Richa (Indian Institute of Management Ahmedabad, 2021)
      I seek to understand the processes of organising that emerges and manifests as food-spaces, where class and gender are constructed and performed. Such spaces may be constituted as 'eating-out' spaces, work-spaces and social ...

    • 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 ...

    • Competitive hub location problems: model and solution approaches 

      Tiwari, Richa; Jayaswal, Sachin; Sinha, Ankur (Elsevier, 2021-03-07)
      In this paper, we study the hub location problem of an airline that wants to set up its hub and spoke network, in order to maximize its market share in a competitive market. The market share is maximized under the assumption ...

    • Convex preference cone-based approach for many objective optimization problems 

      Sinha, Ankur; Malo, Pekka; Kallio, Markku (Elsevier, 2018-03)
      Many objective optimization problems have turned out to be a considerable challenge for evolutionary algorithms due to the difficulty of finding and visualizing high-dimensional Pareto frontiers. Fortunately, however, the ...

    • Designing an efficient medical history exchange system using blockchain technology 

      Arora, Archit; Kumar, Madanlal Umesh; Pal, Mayank (Indian Institute of Management Ahmedabad, 2018)
      In a country like India where there is still considerable scope for development in the healthcare sector, innovation in the medical practices to ease the operational process becomes more critical. Often, patients switch ...

    • Dynamic portfolio optimization 

      Khaitan, Abhay; Bharti, Garima (Indian Institute of Management Ahmedabad, 2016)
      We consider the problem of dynamic portfolio optimization as a discrete-time, finite-horizon setting. Our model assigns weights to different stocks to represent the stock’s proportion in the optimum portfolio. The objective ...

    • An enhanced memetic algorithm for single-objective bilevel optimization problems 

      Islam, Md Monjurul; Singh, Hemant Kumar; Ray, Tapabrata; Sinha, Ankur (MIT, 2017)
      Bilevel optimization, as the name reflects, deals with optimization at two interconnected hierarchical levels. The aim is to identify the optimum of an upper-level leader prob- lem, subject to the optimality of a ...

    • Essays on capacitated hub location problems 

      Bhatt, Sneha Dhyani (Indian Institute of Management Ahmedabad, 2023)
      "This thesis studies three essays based on hub location problems (HLPs) wherein hubs have limited capacities. We specifically look at two issues that can severely degrade the performance of a hub-and-spoke network: i) ...

    • Essays on strategic interactions in vertical supply chains: on the role of inventory and technology 

      Balasubramanian, Ganesh (Indian Institute of Management Ahmedabad, 2023)
      "The past two decades have witnessed a shift from centrally managed supply chains to decentralized supply chains (Netessine, 2004). In decentralized supply chains, interests of individual members may not be aligned with ...