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3846 items in total found

Journal Articles | 2017

A Multi-tier linking approach to analyze performance of autonomous vehicle-based storage and retrieval systems

Debjit Roy, Ananth Krishnamurthy, Sunderesh S. Heragu, and Charles Malmborg

Computers & Operations Research

To improve operational flexibility, throughput capacity, and responsiveness in order fulfillment operations, several distribution centers are implementing autonomous vehicle-based storage and retrieval system (AVS/RS) in their high-density storage areas. In such systems, vehicles are self-powered to travel in horizontal directions (x- and y- axes), and use lifts or conveyors for vertical motion (z-axis). In this research, we propose a multi-tier queuing modeling framework for the performance analysis of such vehicle-based warehouse systems. We develop an embedded Markov chain based analysis approach to estimate the first and second moment of inter-departure times from the load-dependent station within a semi-open queuing network. The linking solution approach uses traffic process approximations to analyze the performance of sub-models corresponding to individual tiers (semi-open queues) and the vertical transfer units (open queues). These sub-models are linked to form an integrated queuing network model, which is solved using an iterative algorithm. Performance estimates such as expected transaction cycle times and resource (vehicle and vertical transfer unit) utilization are determined using this algorithm, and can be used to evaluate a variety of design configurations during the conceptualization phase.

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Journal Articles | 2017

Rough information set and its applications in decision making

Manish Aggarwal

IEEE Transactions on Fuzzy Systems

The decision making in the real world is inevitably characterized with vagueness, and imprecision due to incomplete knowledge. To this end, we combine the information set with the rough set theory to represent both the vagueness and imprecision at the same time. We term the proposed structure as rough information set that has information sets based on fuzzy equivalence relations as its building blocks. The usefulness of the proposed structure is demonstrated through a case study in credit scoring analysis, and a biometrics application on knuckle-based recognition.

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Journal Articles | 2017

A system dynamics simulation model of a blast furnace for project evaluation

Goutam Dutta and Medha Ashtekar

International Journal of Business and Systems Research

The manufacturing of hot metal in a blast furnace is one of the important parts of an integrated steel plant. In a blast furnace, the quality and productivity of the output (hot metal) depends on a large number of input and operating variables. In this paper, we simulate complex interactions of technological and financial variables. We chose system dynamics principles to simulate the blast furnace for project evaluation as a useful aid to managerial decisions. The model would be used to answer a number of questions related to investment decisions. We simulate the actual production of hot metal, accumulated hot metal production, net works cost and cost of hot metal per ton for a period of 36 months with real data.

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Journal Articles | 2017

An orchestrated negotiated exchange: Trading home-based telework for intensified work

George Mathew Kandathil and Dharma Raju Bathini

Journal of Business Ethics

In this paper, we explore a popular flexible work arrangement (FWA), home-based telework, in the Indian IT industry. We show how IT managers used the dominant meanings of telework to portray telework as an employee benefit that outweighed the attendant cost—intensified work. While using their discretion to grant telework, the managers drew on this portrayal to orchestrate a negotiated exchange with their subordinates. Consequently, the employees consented to accomplish the intensified work at home in exchange of telework despite their opposition to the intensified work in the office. Thus, whereas the extant studies consider work intensification as an unanticipated outcome of using FWAs, we show how firms may use FWAs strategically to get office-based intensified work accomplished at home. While the dominant argument is that employees reciprocate the opportunity to telework with intensified work, we show a discursively orchestrated negotiation that favors management. A corrective policy measure is to frame telework as an employee right.

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Journal Articles | 2017

Negotiating absent practices and dormant features: discourse as a means of shaping the implementation of a global enterprise system to meet local work culture

George Kandathil and Erica L. Wagner

2017 CHI Conference

The introduction of a new enterprise system to an organization often necessitates the accommodation of standardized practices, which may be in conflict with local users' practices and their work culture. We explore such a conflict in an India-based multinational organization using an eight-month interpretive case study. Based on grounded analysis, we present a narrative account of how consultants, on contract for managing the deployment and making necessary adjustments, used discourse as a means of shaping user understanding about the features and practices embedded in the underlying system, which were not initially realized through the interface. Sustained user resistance to this shaping led to a negotiated compromise and adaptation of the system to incorporate local work culture. Our findings allow us to explore the under-theorized role of discursive power within an implementer-user-technology trio, and illustrate the feedback utility of user resistance in developing culturally-inclusive designs.

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Journal Articles | 2017

Technology non-affordances: The political interactions in the designer-user-technology trio in a developing country

George Kandathil and Erica Wagner

Conference on Human Factors in Computing Systems – Proceedings

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

Integrated fleet mix and routing decision for hazmat transportation: A developing country perspective.

Anand Kumar, Debjit Roy Vedat Verter, and Dheeraj Sharma

European Journal of Operational Research

In developing countries, truck purchase cost is the dominant criteria for fleet acquisition-related decisions. However, we contend that other cost factors such as loss due to the number of en route truck stoppages based on a truck type and recovery cost associated with a route choice decision, should also be considered for deciding the fleet mix and minimizing the overall costs for long-haul shipments. The resulting non-linear model, with integer variables for the number and type of trucks, and the route choices, is solved via genetic algorithm. Using real data from a bulk liquid hazmat transporter, the trade-offs between the cost of travel, loss due to number of truck stoppages, and the long-term recovery cost associated with the risk of exposure due to a hazmat carrier accident are discussed. The numerical experiments show that when factors related to public safety and truck stoppages are taken into account for transportation, the lowest total cost and optimal route choice do not align with the cheapest truck type option; rather, the optimal solution corresponds to another truck type and route with total costs significantly less than the total costs associated with the cheapest truck type. Our model challenges the current truck purchasing strategy adopted in developing countries using the cheapest truck criteria.

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Journal Articles | 2017

Tactical decisions at Vastrapur car rental services

N. Ravichandran

Informs Transactions on Education

IIMA