Tandem Configuration Automated Guided Vehicle Systems: A Comparative Study*

Automated guided vehicle (AGV) systems provide the flexibility and integration required for flexible manufacturing systems. Previous AGV system studies have attempted to reduce the controlling complexities commonly encountered in these systems. However, this has not been accomplished without additional resources (e.g., automated guided vehicles) and lower system flexibility. The primary objective of this study is to compare the performance of AGV system configurations that reduce controlling and modification complexities (i.e., tandem configurations) to traditional AGV system configuration. Three AGV system configurations were tested under 16 experimental conditions. Performance metrics considered were AGV utilization, mean flowtime, mean tardiness, and percent tardy. The results of this study extend the findings of the previous studies in demonstrating the viability of tandem configurations, in that the tandem configurations match the performance of traditional configuration across all performance metrics, without sacrificing ease of control and system flexibility. Finally, the cost tradeoffs inherent in selecting a particular configuration are discussed.     

24/7 SM slavery

This study describes the nature of 24/7 SM slavery as practiced within the SM (sadomasochistic) community. These SM participants, who attempt to live full-time in owner-slave roles, represent a small proportion of those with SM interests. SM slaves have not been studied systematically to determine if and how they differ from other SM practitioners. An online questionnaire was used to obtain responses from individuals who self-identified as slaves. A total of 146 respondents participated, 53% female and 47% male, ranging in age from 18 to 72. We explored the depth of their relationships, how well they approximated "slavery," and how their relationships were structured to maintain distinct roles. Data showed that in long-term SM slave relationships, a power differential exists which extends beyond time-limited SM or sexual interactions. Owners and slaves often use common, daily life experiences or situations, such as the completion of household chores, money management, and morning or evening routines, to distinguish and maintain their respective roles. In addition, contrary to the perception of total submission, results revealed that slaves exercise free will when it is in their best interests to do so. These relationships were long-lasting and satisfying to the respondents.     

Interdisciplinary and Interorganizational Research: Establishing the Science of Enterprise Networks

We review and discuss the evolution of interdisciplinary and interorganizational research in operations management and suggest directions for future investigations. The proposed operations management research focus is one that embraces a more holistic view of an “extended enterprise” which involves working with a new business model—the organization as a network. This methodology starts by treating the organization as a system that is enabled by information technology and is characterized by ubiquitous information sharing across traditional enterprise. Proper integration of technology, business processes and people factors needs to be developed to create higher value from networked enterprises. Operations management research future lies in establishing this science from an interdisciplinary perspective. We analyze this perspective in the context of papers published in the first 50 issues of Production and Operations Management and the related literature.     

PLATFORM COMPETITION IN TWO‐SIDED MARKETS

Many if not most markets with network externalities are two‐sided. To succeed, platforms in industries such as software, portals and media, payment systems and the Internet, must “get both sides of the market on board.” Accordingly, platforms devote much attention to their business model, that is, to how they court each side while making money overall. This paper builds a model of platform competition with two‐sided markets. It unveils the determinants of price allocation and end‐user surplus for different governance structures (profit‐maximizing platforms and not‐for‐profit joint undertakings), and compares the outcomes with those under an integrated monopolist and a Ramsey planner. (JEL: L5, L82, L86, L96)     

THE LENDER OF LAST RESORT: A TWENTY‐FIRST CENTURY APPROACH

The classical Bagehot conception of a Lender of Last Resort (LOLR) that lends to illiquid banks has been criticized on two grounds: On the one hand, the distinction between insolvency and illiquidity is not clear‐cut; on the other, a fully collateralized repo market allows central banks to provide the adequate aggregate amount of liquidity and leave to the banks the responsibility of lending uncollateralized. The object of this paper is to analyze these issues rigorously by providing a framework in which liquidity shocks cannot be distinguished from solvency ones and then asking whether there is a need for a LOLR and how it should operate in the absence of systemic threats. Determining the optimal LOLR policy requires a careful modeling of the structure of the interbank market and of the closure policy. In our setup, the results depend upon the existence of moral hazard. If the main source of moral hazard is the banks' lack of incentives to screen loans, then the LOLR may have to intervene to improve the efficiency of an unsecured interbank market in crisis periods; if instead the main source of moral hazard is loan monitoring, then the interbank market should be secured and the LOLR should never intervene. (JEL: E58, 628)     

Statistical Treatment Rules for Heterogeneous Populations

An important objective of empirical research on treatment response is to provide decision makers with information useful in choosing treatments. This paper studies minimax‐regret treatment choice using the sample data generated by a classical randomized experiment. Consider a utilitarian social planner who must choose among the feasible statistical treatment rules, these being functions that map the sample data and observed covariates of population members into a treatment allocation. If the planner knew the population distribution of treatment response, the optimal treatment rule would maximize mean welfare conditional on all observed covariates. The appropriate use of covariate information is a more subtle matter when only sample data on treatment response are available. I consider the class of conditional empirical success rules; that is, rules assigning persons to treatments that yield the best experimental outcomes conditional on alternative subsets of the observed covariates. I derive a closed‐form bound on the maximum regret of any such rule. Comparison of the bounds for rules that condition on smaller and larger subsets of the covariates yields sufficient sample sizes for productive use of covariate information. When the available sample size exceeds the sufficiency boundary, a planner can be certain that conditioning treatment choice on more covariates is preferable (in terms of minimax regret) to conditioning on fewer covariates.     

Engaging Stakeholders Through Corporate Political Activity: Insights From MNE Nonmarket Strategy in an Emerging African Market

As interest increases in the political engagement between multinational enterprises (MNEs) and emerging economy host governments, less is known about wider MNE stakeholder engagement and the development of nonmarket capabilities in institutionally fragile environments. This study investigates how MNEs engage stakeholders through corporate political activity (CPA) during the pro-market reform of Uganda's electricity generation sector. Data is collected through semi-structured interviews, archival materials and fieldwork notes, and is analyzed using an NVivo-supported grounded analytic method. We find both proactive and reactive leveraging of CPA to manage diverse stakeholders. We argue that the host government remains the most important political stakeholder in the early phases of reform, but changes in institutional and political environments necessitate strategic adaptations as the reform process progresses. These adaptations include the need for local engagement and the accommodation of multi-level stakeholder pressures. Our findings contribute to an understanding of corporate political capabilities in Africa's emerging markets, and illustrate how these capabilities can be strategically leveraged to effectively manage diverse stakeholders.     

A qualitative exploration of reentry service needs: The case of fathers returning from prison

The challenge of community and family reentry after a parent's release from prison remains an under‐addressed area of collateral damage stemming from high rates of U.S. incarceration. Many fathers released from prison return to living with family, and later attribute family connections and parent–child contact as key factors in their postrelease success. However, reentry planning is hampered by a dearth of research on family‐focused reentry services, and consequently, often omits attention to resuming family and parenting roles. To address this gap, we conducted 38 semi‐structured interviews with 19 previously incarcerated fathers, 9 co‐parenting mothers, and 10 relatives to explore service needs of fathers during reentry. Findings suggest programs not only should be multimodal, emphasizing family connections complemented by socioeconomic, self‐care, and social support services, but also should be accessible and relatable, offered within the community, and engaging for fathers and family members. Findings reinforce the importance of self‐determination and human agency while underscoring the multiple challenges fathers face upon reentry. By including the voices of those most affected by incarceration, this study advances knowledge to shape reentry programs and policies, contributes to efforts addressing criminal justice inequities, and promotes well‐being among formerly incarcerated parents and their families.