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3549 items in total found

Journal Articles | 2017

A review on bilevel optimization: from classical to evolutionary approaches and applications

Ankur Sinha, Pekka Malo, and Kalyanmoy Deb

IEEE Computational Intelligence Society

Bilevel optimization is defined as a mathematical program, where an optimization problem contains another optimization problem as a constraint. These problems have received significant attention from the mathematical programming community. Only limited work exists on bilevel problems using evolutionary computation techniques; however, recently there has been an increasing interest due to the proliferation of practical applications and the potential of evolutionary algorithms in tackling these problems. This paper provides a comprehensive review on bilevel optimization from the basic principles to solution strategies; both classical and evolutionary. A number of potential application problems are also discussed. To offer the readers insights on the prominent developments in the field of bilevel optimization, we have performed an automated text-analysis of an extended list of papers published on bilevel optimization to date. This paper should motivate evolutionary computation researchers to pay more attention to this practical yet challenging area.

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Journal Articles | 2017

Optimal management of naturally regenerating uneven-aged forests

Ankur Sinha, Janne Ramo, Pekka Malo, and Olli Tahvonen

European Journal of Operational Research

A shift from even-aged forest management to uneven-aged management practices leads to a problem rather different from the existing straightforward practice that follows a rotation cycle of artificial regeneration, thinning of inferior trees and a clearcut. A lack of realistic models and methods suggesting how to manage uneven-aged stands in a way that is economically viable and ecologically sustainable creates difficulties in adopting this new management practice. To tackle this problem, we make a two-fold contribution in this paper. The first contribution is the proposal of an algorithm that is able to handle a realistic uneven-aged stand management model that is otherwise computationally tedious and intractable. The model considered in this paper is an empirically estimated size-structured ecological model for uneven-aged spruce forests. The second contribution is on the sensitivity analysis of the forest model with respect to a number of important parameters. The analysis provides us an insight into the behavior of the uneven-aged forest model.

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Journal Articles | 2017

Approximated set-valued mapping approach for handling multiobjective bilevel problems

Ankur Sinha, Pekka Malo, and Kalyanmoy Deb

Computers & Operations Research

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 relatively little attention from researchers in both the domains. The existing algorithms are mostly brute-force nested strategies, and therefore computationally demanding. In this paper, we develop insights into multiobjective bilevel optimization through theoretical progress made in the direction of parametric multiobjective programming. We introduce an approximated set-valued mapping procedure that would be helpful in the development of efficient evolutionary approaches for solving these problems. The utility of the procedure has been emphasized by incorporating it in a hierarchical evolutionary framework and assessing the improvements. Test problems with varying levels of complexity have been used in the experiments.

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Journal Articles | 2017

Online education worldwide: Current status and emerging trends

Anil Kumar, Poonam Kumar, Shailendra C. Jain Palvia, and Sanjay Verma

Journal of Information Technology Case and Application Research

Journal Articles | 2017

Human resource planning as a strategic function: Biases in forecasting judgement

Manjari Singh and Jatinder Kumar Jha

International Journal of Strategic Decision Sciences

This paper explores the strategic importance of human resource (HR) planning and the various techniques employed by organizations to attract talent and thus to gain a competitive edge. In this paper, the authors have tried to explore the various biases that come into play when supervisors forecast for human resources. Backed by research, the paper recommends the integration of line managers with HR managers and their participations in strategic planning to enable the HR managers to gain valuable insights for HR planning. The paper further suggests that though biases cannot be ruled out completely but they can be controlled by providing relevant training to the HR and line managers to forecast dynamics. Further, the judgement of the line managers could be complemented with other forecasting techniques to make the process more reliable.

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Journal Articles | 2017

Multilevel analysis of ambidexterity and tagging of specialised projects in project-based information technology firms

Srihari Suresh Sohani and Manjari Singh

International Journal of Operations & Production Management

Purpose

The purpose of this paper is to understand the expression of ambidexterity at the “between” projects level as well as the “within” project level in project-based information technology firms (PBITF). The research also provides a framework for the classification of specialised projects. This classification is essential to clarify the level of attention the project will receive with respect to the appropriation of resources and the requisite management bandwidth.

Design/methodology/approach

This paper draws on a nine-month long field-based qualitative study and ensures a rigorous triangulation of the findings through an analysis of archival data and actual project artefacts.

Findings

The authors bring forth three critical implications for practice. First, strategizing ambidexterity at the level of “between” projects and “within” projects is heavily dependent on the interaction among distributed actors and partners. Second, routines and actions to deal with manpower constraints are completely different at these two levels. Lastly, the classification framework of specialised projects proposed here should enable firms to appropriately apportion resources to engagements that are strategic in nature.

Originality/value

The study extends the concept of ambidexterity to the “within” project level and finds it relevant at the lowest level in the project-based structure. Also, the framework for the classification of specialised projects that is provided will assist decision makers in PBIT firms to decide the organisational response to such projects.

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Journal Articles | 2017

Tactical decisions at Vastrapur car rental services

N. Ravichandran

Informs Transactions on Education

Journal Articles | 2017

Operations research in India: The past, present and the future

N. Ravichandran

Annals of Management Studies

The purpose of this perspective article is to review the development of Operation Research (OR) as a discipline in the Indian context. Based on this review, we suggest a plan to re-energize the discipline.

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Journal Articles | 2017

The low politics of higher education: saffron branded neoliberalism and the assault on Indian universities

Navdeep Mathur

Critical Political Studies

Through an examination of recent events and controversies at Indian universities, this article reflects on the neoliberal creep taking over academia. The narrative connects the suicide note of a Dalit caste doctoral student, a student festival of political dissent, missives from the education minister, the financialization of higher education, and a market-oriented performance management system to discipline the professoriate. The latter element in the narrative is illustrated through my own teaching and research practice whose intellectual foundations draw on Professor Frank Fischer’s scholarship. This personal reflection draws on my experiences in seeking to inhabit the role of a facilitator of participatory learning, engaging directly with policy actors and their cultural modes of communication.

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Journal Articles | 2017

Assessing Administrative Reform in India

Kuldeep Mathur and Navdeep Mathur

Chinese Political Science Review/Springer

This paper outlines trends in efforts at administrative reform in India. It spans the shift of ideological paradigm of the Indian political economy. While the pre-1991 period was marked by a waning Statism, structural economic reforms marked a shift towards neo-liberal public management in the post 1991 period. This shift made the role of markets more salient as a framework for public services, in contrast to traditional perspectives of public administration. In the last two decades, even though some concern regarding administrative reform was expressed, substantive change took place outside the realm of the state machinery while blurring the borders between private and public institutions in delivering public services. The current political regime has added emphasis in the direction of using the bureaucracy to promote marketization and privatization in the allocation of public resources.

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