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821 items in total found

Journal Articles | 2021

Directed fixed charge multicommodity network design: A cutting plane approach using polar duality

Yogesh Agarwal, Yash Aneja, and Sachin Jayaswal

European Journal of Operational Research

We present an efficient cutting-plane based approach to exactly solve a directed fixed charge network design (DFCND) problem, wherein the valid inequalities to the problem are generated using the polar duality approach. The biggest challenge in using this approach arises in constructing the polar dual of the problem. This would require enumerating all the extreme points of the convex hull of DFCND, which is computationally impractical for any instance of a reasonable size. Moreover, the resulting polar dual would be too large to solve efficiently, which is required at every iteration of the cutting-plane algorithm. The novelty of our solution approach lies in suggesting a way to circumvent this challenge by instead generating the violated facets, using polar duality, of the smaller substructures involving only a small subset of constraints and variables, obtained from 2-, 3-and 4-partitions of the underlying graph. For problem instances based on sparse graphs with zero flow costs, addition of these inequalities closes more than 20% of the optimality gap remaining after the addition of the knapsack cover inequalities used in the literature. This allows us to solve the problem instances in less than 400 s, on average, which otherwise take around 1000 s with the addition of only the knapsack cover inequalities, and around 4 hours for the Cplex MIP solver at its default setting.

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Journal Articles | 2021

Impostor phenomenon and discipline-specific experiences of violence in Science, Technology, Engineering, and Mathematics

Devasmita Chakraverty and Meenakshi Rishi

Violence and Gender

Impostor phenomenon (IP) engenders persistent, self-deprecating beliefs of fraudulence for those who cannot internalize success and fear that they have fooled others into overestimating their abilities. Although well documented in science, technology, engineering, and mathematics (STEM), discipline-specific experiences of IP within STEM are not well explored, but could illustrate if there are nuances within STEM disciplines. This qualitative study examined discipline-specific experiences of IP due to academic workplace violence. Semistructured interviews from 34 United States-based, female PhD students were analyzed qualitatively using constant comparative method. Participants were recruited using convenience/snowball sampling for a brief survey and further interviewed based on certain eligibility criteria. Findings suggest that IP related to three types of disciplines, those involving outdoor fieldwork (e.g., geology), those with a predominantly higher number of men (e.g., physics), and those with a predominantly higher number of women (e.g., biology). Academic workplace violence included nonphysical abusive behavior, gender-based harassment, incivility, unwanted sexual attention, abusive supervision, and microaggressions. While those experiencing IP due to workplace violence were all women, perpetrators included men and women in positions of power (e.g., PhD advisors) as well as male peers. Findings enriched our understanding of IP experienced as a result of academic workplace violence.

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Journal Articles | 2021

Global value chains and intermediaries in multi-stakeholder initiatives in Pakistan and India

Peter Lund-Thomsen, Lone Riisgaard, Sukhpal Singh, Shakil Ghori, and Neil M. Coe

Development and Change

Journal Articles | 2021

Sovereign credit ratings, relative risk ratings and private capital flows: evidence from emerging and frontier markets

Supriyo De, Sanket Mohapatra, and Dilip Ratha

Studies in Economics and Finance

Journal Articles | 2021

Understanding talent management for sports organizations - Evidence from an emerging country

Yusuf Hassan, Jatin Pandey, Biju Varkkey, Deepa Sethi, and Hugh Scullion

The International Journal of Human Resource Management

Journal Articles | 2021

Antecedents to firm performance during re-internationalization

Salman Ali, Ajeet N Mathur, and Anand Kumar Jaiswal

Australian Journal of Management

There is a paucity of research on re-internationalization, where firms re-enter international operations after complete withdrawal from previous international operations. The extant literature is largely silent on what drives firm performance during re-internationalization. We conducted an empirical investigation of re-internationalized enterprises from India to identify key antecedents to firm performance during the re-internationalization phase. Data analysis using partial least squares structural equation modeling (PLS-SEM) indicates that initial internationalization experiences, presence of dynamic capabilities, and organizational commitment to internationalization positively contribute to re-internationalization performance. The findings have implications for firm strategies, organization systems, managerial attention to knowledge management, policies supporting subventions, and for future research into de-internationalization and re-internationalization.

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Journal Articles | 2021

The implications of economic uncertainty for bank loan portfolios

Sanket Mohapatra and Siddharth M. Purohit

Applied Economics

This paper analyses the impact of economic uncertainty on the composition of bank credit across household and firm loans. Using bank-level data spanning 40 developed and developing countries, we find that higher economic uncertainty is associated with an increase in the relative share of household credit in the loan portfolio of banks. This change in composition of credit may result from banks efforts to reduce the overall riskiness of their loan portfolios, since corporate loans are generally viewed as riskier than household loans. This shift is more pronounced for weakly-capitalized banks, which may face greater risks during economic shocks, and for larger banks, which may be riskier due to complex business models and more market-based activities. The variation in our main findings by banks capitalization and size suggests that they arise from changes in bank credit supply in response to greater uncertainty. The baseline results hold for a range of robustness tests. Our study highlights the role of aggregate uncertainty in micro-level outcomes and are relevant for bank capital regulation and the conduct of macroprudential policy.

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Journal Articles | 2021

Central bank gold reserves and sovereign credit risk

Sawan Rathi, Sanket Mohapatra, and Arvind Sahay

Finance Research Letters

Gold holdings with central banks are often considered to play a stabilizing role in times of crisis. This paper performs a cross-country panel data analysis of developed and developing countries to determine whether gold holdings of central banks contribute to sovereign creditworthiness. Our analysis confirms that an increase in central bank gold reserves reduces the credit default swap (CDS) spreads of a country. We also observe that during global crisis and country-specific crisis episodes, the role of central bank gold becomes even more important. In robustness tests, we account for potential endogeneity of central bank gold reserves using a Generalized Method of Moments (GMM) approach. The findings highlight the importance of gold in central bank reserves and indicate a positive role of gold in mitigating a nations external vulnerabilities in an uncertain global economic environment.

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Journal Articles | 2020

What motivates members to transact on social C2C communities? A theoretical explanation

Deepak Trehan and Rajat Sharma

Journal of Consumer Marketing

Purpose – This paper aims to investigate the consumer motivation to buy products on consumer-to-consumer (C2C) communities on social networking sites (SNSs). These transactions involve no intermediation or payment of fees by any party. The phenomenon is in contrast with the traditional C2C transactions, on websites such as eBay, where the company website facilitates the transaction between consumers, charges a fee to sellers and provides limited information about buyers and sellers.

Design/methodology/approach – Drawing from media richness theory and social capital theory, this paper thus proposes and empirically tests a theoretical model developed using data collected from people making transactions on these communities that synthesize the motivations behind consumers’ intention to buy.

Findings – The results indicate that the media richness of the Facebook platform increases the social capital and sense of virtual community among users, which further impacts the purchase intentions of users. Social capital alone does not lead to purchase intention and indirectly impacts purchase intentions through the trust dimension.

Research limitations/implications – This study contributes to theorizing the role of the platform, social capital and sense of virtual community in buying behavior on SNSs and provides valuable new insights into these constructs for the brand managers on social media sites.

Originality/value – Existing research on social commerce does not hold true for C2C communities on SNSs. This paper provides a new perspective into these communities through the lens of media richness and social capital constructs as antecedents of purchase intentions on these communities.

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Journal Articles | 2020

The impostor phenomenon among Black doctoral and postdoctoral scholars in STEM.

Devasmita Chakraverty

International Journal of Doctoral Studies

Aim/Purpose

This study examined experiences related to the impostor phenomenon among Black doctoral and postdoctoral scholars in science, technology, engineering, and mathematics (STEM).

Background

Research on the impostor phenomenon is usually focused on undergraduates, especially for Blacks, with sparse research on Black doctoral and postdoctoral scholars. This phenomenon was originally investigated among Whites. Due to fewer studies on Blacks, culturally-relevant understanding of the impostor phenomenon is limited.

Methodology

This study used surveys and interviews (convergent mixed-methods) to examine the impostor phenomenon among U.S.-based doctoral and postdoctoral scholars (together referred to as “trainees”) in STEM. Participants took a survey (that used the Clance Impostor Phenomenon Scale or CIPS to individually compute impostor phenomenon scores) and a one-on-one, semi-structured interview. Survey (with CIPS scores) and interview data were converged from the same participants, who were recruited from a national conference focused on minorities in STEM (convenience sampling). Using constant comparative method and analytic induction, interview-data were categorized into themes.

Contribution

Findings documented race-based impostor-experiences, possibly culturally relevant to other groups of underrepresented minorities (URMs). Findings have implications for research, policy, and practice. These include future initiatives to broaden participation in STEM careers among the underrepresented groups, support those who might experience this phenomenon and transition challenges in academia, and create greater awareness of the challenges trainees face based on their background and life experiences.

Findings

Surveys indicated moderate to intense impostor phenomenon among 15 participants at the time data were collected. Interviews with the same participants found six themes linked to the impostor phenomenon: 1) Being the only-one, 2) Lack of belonging, 3) Stereotyping, micro-aggression and judgment, 4) External appearances, 5) Feeling like the “diversity enhancers,” and 6) Complications of intersecting identities.

Recommendations for Practitioners

Practitioners should consider the tensions and complications of Black identity and how it ties to training experiences in STEM as well as how race-based impostor phenomenon could shape an individual’s interaction with faculty, mentors, and peers. This knowledge could be helpful in designing professional development programs for Blacks.

Recommendation for Researchers

Study findings could have research implications on the way doctoral and postdoctoral training is reimagined to be more inclusive and welcoming of diversity across multiple axes of gender, race/ethnicity, class, first-generation status, ability, sexual orientation, and country of origin, among others.

Impact on Society

Black trainees could be vulnerable to leaving STEM fields due to their underrepresentation, lack of critical mass, racial discrimination, and other unpleasant experiences. Conversations around training, development, and means to address psychological distress could focus on culturally-relevant experiences of the impostor phenomenon.

Future Research

Future research could look at the experiences of other underrepresented groups in STEM such as Native Americans and Hispanics as well as among faculty of color and individuals from other fields beyond STEM.

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IIMA