Ray Venkataraman and Richard Unkle
The purpose of this article is to determine if there is a linkage between the army material systems analysis activity (AMSAA) reliability growth models at the system and subsystem…
Abstract
Purpose
The purpose of this article is to determine if there is a linkage between the army material systems analysis activity (AMSAA) reliability growth models at the system and subsystem levels and at the subsystem and functional levels of indenture. If such a linkage exists, how this information can be used when tracking reliability of fielded systems to provide early warning signals to detect unwanted reliability problems at lower levels, where improvements are typically made.
Design/methodology/approach
Actual performance data from large equipments were analyzed for several groupings of such equipment, where equipment age and generation of design determined the groupings. For each dataset, the system‐level trend was measured using the AMSAA model for three different cases. For each of the three cases, all subsystem trends were measured, in addition to the system‐level trend. This was done to see if any relationship exists, as hypothesized, between system and subsystem trends. Data were analyzed using three different combinations of time periods to facilitate a later investigation of the predictive capabilities of the AMSAA model.
Findings
Results indicate that, for large complex systems or equipment, there appears to be a linkage at the subsystem and functional levels. However, no such hazard rate trending relationship exists between the system and subsystem levels. Based on these results, it can be cautiously concluded that, in terms of reliability, in subsystems that exhibit an increasing trend in unwanted issues, there is a higher likelihood of a function that is driving such a trend.
Practical implications
A useful approach in reliability studies to see if the hazard rate trending relationships between levels of hardware indenture exists as one progresses toward the system‐level. For large complex systems or equipments, such as the one represented here, the initial results indicate that the answer is no, at least between the system and subsystem levels of indenture. However, there is strong evidence that such relationships are valid between subsystems and their functions.
Originality/value
This paper advances existing knowledge in the area of reliability analysis by exploring the use of army material systems analysis activity (AMSAA) reliability growth models to determine linkages between the system and subsystem levels and at the subsystem and functional levels of indenture. If such a linkage exists, it is possible to determine how this information can be used to provide early warning signals when tracking reliability of fielded systems.
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Jay Nathan and Ray Venkataraman
This paper examines the impact of forecast window intervals on replanning frequencies for a rolling horizon master production schedule (MPS). The problem environment for this…
Abstract
This paper examines the impact of forecast window intervals on replanning frequencies for a rolling horizon master production schedule (MPS). The problem environment for this study is an actual MPS operation of a paint company and includes features such as multiple production lines, multiple products, capacity constraints, minimum inventory requirements. A mixed integer goal programming model formulated for the MPS problem is used to analyze the impact of forecast window interval length on replanning frequencies and MPS performance in a rolling horizon setting. Given demand certainty, results indicate that the length of the forecast window interval influences the choice of replanning frequency for this company environment. A three‐month forecast window interval with a two‐month replanning frequency provided the best MPS performance in terms of total cost.
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Ray Venkataraman and Jay Nathan
Previous research has not addressed the problem of developing a masterproduction schedule (MPS) for production systems with minimum batch‐sizeproduction restrictions. Proposes a…
Abstract
Previous research has not addressed the problem of developing a master production schedule (MPS) for production systems with minimum batch‐size production restrictions. Proposes a weighted integer goal‐programming model for the development of a rolling horizon master production schedule, under conditions of demand certainty, for a process industry environment with multiple production lines and minimum batch‐size production restrictions. The presence of multiple and often conflicting goals prevalent in production planning and scheduling is explicitly incorporated in the model. The model can easily be implemented on a microcomputer and the master production schedule developed is in spreadsheet format and can easily be understood by a practitioner. Uses a case study conducted for a paint company to illustrate and validate the model. Results show that the MPS developed using the proposed model is superior in terms of total cost when compared with actual company performance.
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Zorica Zagorac-Uremović and Christian Marxt
Entrepreneurial opportunity (EO) identification pertains to the core processes of entrepreneurship and innovation. The initial phase of this process starts with individual…
Abstract
Entrepreneurial opportunity (EO) identification pertains to the core processes of entrepreneurship and innovation. The initial phase of this process starts with individual cognition, which is why cognition has been established as a critical theoretical perspective.
Knowledge and new information have been confirmed as essential cognitive impact factors. However, it is not understood well, how individuals apply those factors and how they actually identify innovative and economically viable EOs. To address the limitations of current research, this chapter investigates the current literature on underlying cognitive processes of opportunity identification.
The literature analysis demonstrates that there is not a single cognitive process but rather a magnitude of different micro-mechanisms that are necessary for the successful identification of EOs. The findings are grouped to four categories of cognitive processes and entail their micro-mechanisms: pattern recognition, information processing, and creative thinking. Furthermore, the analysis reveals that those micro-mechanisms have seldom been related to each other within the scope of opportunity identification. This chapter closes this gap by discussing and contrasting and the different process categories and respective micro-mechanisms and suggests an integrative theory development and avenues for future research.
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Richard Unkle and Ray Venkataraman
Historically, reliability of systems has been tracked based on a common assumption that, at the system level, the failure rate follows the exponential distribution, and is…
Abstract
Historically, reliability of systems has been tracked based on a common assumption that, at the system level, the failure rate follows the exponential distribution, and is therefore assumed to be constant over the useful life of the system. However, this method, while adequate for many purposes, does not necessarily provide the early warning system that many companies need to stay ahead of expensive quality or reliability fixes. This paper presents a new method that provides the needed early warning, at a reasonable analysis cost, by combining the use of two reliability distributions for the purpose of analyzing fielded systems. In particular, this paper describes a hypothesized relationship between a key parameter contained in the Weibull distribution and within the Army Material Systems Analysis Activity (AMSAA) reliability growth model. Actual data from General Electric Transportation Systems (GETS) were used to explore this relationship. The results suggest that there indeed exists a significant relationship between the two models and both can be used in tandem to track reliability of systems.
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Diane H. Parente, Ray Venkataraman, John Fizel and Ido Millet
The rapid growth of online auctions underscores the need to analyze the mechanism of online auctions and to establish a theoretical research framework based on the business models…
Abstract
The rapid growth of online auctions underscores the need to analyze the mechanism of online auctions and to establish a theoretical research framework based on the business models adopted by successful organizations. While the theoretical and empirical research bases for traditional auctions are well established, current understanding of online auctions is still very limited. A broad conceptual model is developed that can form the basis for future research in online auctions. A review of prior research and use systems theory and empirical analysis is presented to identify the potential antecedents to online auction success. Then dimensions of the input, process, and output factors are discussed to develop the conceptual model. The conceptual model provides an impetus and direction for future research into online auctions, taking advantage of existing tradition but also forming the basis for the development and testing of research hypotheses that will expand the frontiers of knowledge in online auctions.
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Entrepreneurship is a prominent area of inquiry which is enriched by an ample literature base and challenged by definitional deficiencies. Over the years, multiple perspectives of…
Abstract
Entrepreneurship is a prominent area of inquiry which is enriched by an ample literature base and challenged by definitional deficiencies. Over the years, multiple perspectives of entrepreneurship have emerged and a holistic approach to entrepreneurship has been proposed. This can facilitate the continued enlargement of the entrepreneurship field and allow for interdisciplinary research within the African region. This chapter contributes to the literature on entrepreneurship in developing economies by providing an extensive review of the various approaches that entrepreneurship has been conceptualised. Nine themes are explored: the great person, economic perspective, psychological perspective, sociological perspective, behavioural perspective, management, intrapreneurship, cognitive perspective and leadership perspective. This is followed by an examination of entrepreneurship as a process, as a new venture creation and as an art of opportunity recognition and exploitation. In the last section of this chapter, a clarion call is made for more African scholarship and research in the field of entrepreneurship.
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Cici Xiao He and Masoud Karami
This study explains the international opportunity development of SMEs from emerging economies during institutional transition. This research enriches our understanding of how…
Abstract
This study explains the international opportunity development of SMEs from emerging economies during institutional transition. This research enriches our understanding of how these firms adopt different approaches to developing international opportunities when they confront the turbulent institutional environment. We develop a phase-based framework for the evolution of transitional institution for SMEs’ internationalization and the SMEs’ internationalization process in that framework. By providing an empirical case study of a privately owned SME from China, the main finding is that SMEs from emerging economies become more entrepreneurial and proactive in developing the international opportunity during the institutional transition.
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Joseph Rubleske and Nicholas Berente
This paper aims at advancing a pragmatist perspective on entrepreneurial opportunities as an alternative to the traditional and predominant constructivist and objectivist…
Abstract
Purpose
This paper aims at advancing a pragmatist perspective on entrepreneurial opportunities as an alternative to the traditional and predominant constructivist and objectivist perspectives. To this end, this paper advances a pragmatist definition of an opportunity and draws from empirical evidence to propose a pragmatist model of opportunity conception and exploitation.
Design/methodology/approach
A review of the entrepreneurial opportunity and pragmatism literatures yields a definition of an opportunity as a dynamic and unfolding experience which an entrepreneur conceives as a general market need to exploit it for financial or social gain. Drawing from this definition, and with the aim of developing a pragmatist model of an opportunity, a case study approach is applied to three radically innovative services conceived and developed by three high-performance computing (HPC) centers.
Findings
In each of the three cases, an entrepreneurial HPC center conceived a new, general market need (opportunity) and then acted to exploit it. Through its action, the HPC center learned something that enabled it to address barriers, develop an improvement or otherwise reconceive the opportunity. In turn, the HPC center learned more about and advanced the opportunity, and then acted again. After launching a new service based on the opportunity, the opportunity continued to evolve in response to the HPC center’s efforts and to market forces.
Research limitations/implications
The pragmatist perspective and model of an opportunity can serve as a foundation for future pragmatist research into entrepreneurship and innovation. To this end, future studies could extend the model by examining in greater detail the acting-learning-reconceiving cycle, by exploring how an opportunity evolves and is reconceived after market launch and/or by investigating opportunity conception and exploitation within other types of markets.
Practical implications
From a pragmatist perspective, an opportunity is not some discrete object to be discovered. It is emergent and dynamic, and to the extent that it is “created”, it is never complete or finalized. It is experienced by the entrepreneur, and it continues to evolve, even after it has been launched as a new good or service.
Originality/value
The paper proposes novel value by advancing a pragmatist perspective on entrepreneurial opportunities. Such a perspective is an alternative to the constructivist and objectivist perspectives that have framed research into opportunities. The paper also proposes novel value by drawing from case study findings to propose a pragmatist model of opportunity conception and exploitation.
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Peter van der Sijde, Ariane von_Raesfeld Meijer, Kjell de Ruijter and Paul Kirwan
Over many years people have tried to understand the entrepreneurial process (e.g., Hayek, 1945; Kirzner, 1973; Shane & Venkataraman, 2000; Schumpeter, 1934). Van der Veen and…
Abstract
Over many years people have tried to understand the entrepreneurial process (e.g., Hayek, 1945; Kirzner, 1973; Shane & Venkataraman, 2000; Schumpeter, 1934). Van der Veen and Wakkee (2004) reviewed the literature and introduced the role of the entrepreneur and the environment in this process. An environment can have two roles: as a stimulus for opportunity (Burt, 1992; Gaglio, 1997; Shane, 2000; Vesper, 1989), and as a resource for pursuing that opportunity (Brush, Greene, & Hart, 2001). The view emerging from the research by Shane and Venkataraman (2000) and Van der Veen and Wakkee (2004), is that the entrepreneurial process is not merely a series of decisions, but more a sequence of events the entrepreneur goes through as a result of the environment and previous actions taken.