Fuzzy logic in manufacturing: A review of literature and a specialized application

Manufacturing decisions inherently face uncertainties and imprecision. Fuzzy logic, and tools based on fuzzy logic, allow for the inclusion of uncertainties and imperfect information in decision making models, making them well suited for manufacturing decisions. In this study, we first review the progression in the use of fuzzy tools in tackling different manufacturing issues during the past two decades. We then apply fuzzy linear programming to a less emphasized, but important issue in manufacturing, namely that of product mix prioritization. The proposed algorithm, based on linear programming with fuzzy constraints and integer variables, provides several advantages to existing algorithm as it carries increased ease in understanding, in use, and provides flexibility in its application.     

Supplier innovativeness, organizational learning styles and manufacturer performance: An empirical assessment

Suppliers have become an increasingly important source of product and process innovation. While case studies have documented how supplier innovation can benefit a manufacturer, this relationship has not been empirically validated, nor have contingencies been explored. Using organizational learning theory we posit that the link between supplier innovativeness and manufacturer performance is moderated by the “fit” between the learning styles of the manufacturer and supplier. We empirically test our hypotheses using hierarchical linear modeling of survey responses from 148 manufacturers concerning 592 suppliers. Results indicate that supplier innovativeness has positive impacts on multiple dimensions of manufacturer performance. Results show that when the outsourced activity involves low levels of design responsibility by the supplier, it is more beneficial for the two partners to have contrasting learning styles. However, when the outsourced activity is design-intensive, it is more beneficial to have a supplier with an explorative learning style.     

Film and ideology: narrative analysis of the student movement in Iranian Cinema (2001–2004)

Quality & Quantity - Cinema has a complex relation with the state and social reality in Iran. Between 2001 and 2004, Iranian cinema was under the control of the ideology of the Islamic Left....     

Hybrid performance evaluation of sustainable service and manufacturing supply chain management: An integrated approach of fuzzy dematel and fuzzy inference system

The aim of this paper is to propose a comprehensive framework for simultaneously measuring the performance of sustainable service and manufacturing supply chain management. Application of the proposed approach also results in reduced uncertainty of the performance measurement process caused by qualitative criteria evaluation. The proposed approach consists of two main steps. First, the fuzzy decision‐making trial and evaluation laboratory (DEMATEL) method has been used to determine important criteria by avoiding low influences; and then a Mamdani fuzzy inference system model has been adopted and applied for performance evaluation of sustainable supply chain management (SSCM). This model is employed in order to cope with the vagueness that exists in the SSCM performance investigation due to the vagueness intrinsic in the evaluation of criteria. In the proposed model, human reasoning has been modelled with fuzzy inference rules and has been set in the system, which is an advantage compared with those models in which fuzzy set theory and multicriteria decision‐making models are integrated. The proposed approach has been implemented in the pipe and fitting industry in order to highlight its application in real life. Sensitivity analysis has been carried out to determine the influence of service and manufacturing criteria on SSCM performance. The findings reveal that sustainable manufacturing criteria compared with sustainable service criteria have more effect on the performance of SSCM.     

Pre-IPO ownership structure and its impact on the IPO process

We investigate the impact of pre-issue ownership structure on the key decisions surrounding an IPO. We find that managerial ownership is significantly related to (1) the proportion of shares offered, (2) share allocation, and (3) direct issue-related expenses. This suggests that pre-IPO ownership by managers influences their incentive to maintain control and to lower the cost of going public. In comparison, large pre-IPO non-managerial shareholders are more concerned about exiting, and their presence tends to increase issue size and costs. Our findings indicate that differences in pre-IPO owners’ incentives and bargaining power as implied by their pre-IPO shareholdings can significantly influence the IPO process.     

The effect of environmental complexity and environmental dynamism on lean practices

Increasingly manufacturers implement lean practices to improve operational performance. In addition, manufacturers operate in ever more complex and volatile environments. This research investigates the effects of environmental complexity and dynamism on lean operations and lean purchasing practices. It empirically examines these relationships using archival and survey data from 126 manufacturers. The results show that environmental complexity positively moderates the effects of lean operations and lean purchasing on performance. However, environmental dynamism reduces the benefits of lean operations on performance, but enhances the benefits of lean purchasing on performance. Robustness tests further confirm the contingent effects of complexity and dynamism on lean operations and lean purchasing. This research offers a more nuanced understanding of the effect of external environmental context on lean practices, and suggests that practitioners should carefully consider the external environment when implementing different types of lean practices.     

EARNINGS CONFERENCE CALLS AND INSTITUTIONAL MONITORING: EVIDENCE FROM TEXTUAL ANALYSIS

We document the effects of institutional investors on the qualitative information disclosure of firms during earnings conference calls. Using conference call and institutional ownership data between 2005 and 2016, we find that aggregate institutional ownership dampens conference call tone. The effects of institutional investors on tone are causal based on results from indexed firms. Consistent with hypotheses regarding investors' horizons, short-term institutional investors are associated with a more positive conference call tone, as well as more opportunistic trading, whereas long-term investors are associated with a more negative tone. Market participants can generally disentangle the impact of institutional investors on tone based on investor type.     

See What We Want to See? The Effects of Managerial Experience on Corporate Green Investments

How impartial are managerial decisions? This question is particularly concerning when it comes to making green investment decisions in the face of stakeholder pressures. When managers respond to stakeholder pressures, their personal cognition, judgment, and past experiences play a role in determining their responses. The salience of particular stakeholder claims may be determined by deeply rooted individual preferences. This research investigates how a manager’s past experiences can influence green investments. Data are gathered from 247 managers about their past experience and their employer’s performance data. These data are combined with managerial responses to a vignette-based experiment, which required managers to make green investments based on a decision scenario where they are exposed to different types and strength of stakeholder pressure (from consumers and the community). Results suggest that managers’ years of experience, their employers’ financial performance, and their employers’ market performance influence investment decisions even when making decisions under new and different set of circumstances. While the employers’ financial performance influences managers to invest more, the employers’ market performance only influences managers’ investment in the presence of either high consumer or high community pressure. Compared to less-experienced managers, experienced managers invest more in response to consumer pressure but less in response to community pressure. Practical and theoretical implications of these findings in green management are explored.     

Right anterior thoracotomy aortic valve replacement is associated with less cost than sternotomy-based approaches: a multi-institution analysis of ‘real world’ data

Background:

Large institutional analyses demonstrating outcomes of right anterior mini-thoracotomy (RAT) for isolated aortic valve replacement (isoAVR) do not exist. In this study, a group of cardiac surgeons who routinely perform minimally invasive isoAVR analyzed a cross-section of US hospital records in order to analyze outcomes of RAT as compared to sternotomy.

Methods:

The Premier database was queried from 2007–2011 for clinical and cost data for patients undergoing isoAVR. This de-identified database contains billing, hospital cost, and coding data from >600 US facilities with information from >25 million inpatient discharges. Expert rules were developed to identify patients with RAT and those with any sternal incision (aStern). Propensity matching created groups adjusted for patient differences. The impact of surgical approach on outcomes and costs was modeled using regression analysis and, where indicated, adjusting for hospital size and geographical differences.

Results:

AVR was performed in 27,051 patients. Analysis identified isoAVR by RAT (n?=?1572) and by aStern (n?=?3962). Propensity matching created two groups of 921 patients. RAT was more likely performed in southern hospitals (63% vs 36%; p?p?p?p?p?Conclusions:

Outcomes analyses can be performed from hospital administrative collective databases. This real world analysis demonstrates comparable outcomes and less cost and ICU time with RAT for AVR.