Measuring the performance of FCM versus PSO for fuzzy clustering problems

Clustering cellular manufacturing plays an important role in many industrial engineering problems. This paper investigates the performance of two methods of heuristic and metaheuristics fuzzy clustering. The proposed method investigates heuristic well-known FCM and particle swarm optimization (PSO) on some well-known benchmarks. We use two criteria of J(P) as well as Xie-Beni to compare the results. Three parameters of PSO method is tuned using design of experiment and then the results of PSO are compared versus FCM method in terms of two mentioned criteria. The proposed models are run for each instance 10 different times and, using ANOVA test, the means of two methods are compared. While the results of ANOVA do not indicate any meaningful difference between PSO and FCM in terms of J(P), we have found some meaningful differences between PSO and FCM in terms of Xie-Beni criterion. In other words, PSO performs better than FCM in terms of Xie-Beni

Existence of Weak Efficient Solutions of Set-Valued Optimization Problems

In this paper, we consider a new scalarization function for set-valued maps. As the main goal, by using this scalarization function, we obtain some Weierstrass-type theorems for the noncontinuous set optimization problems via the coercivity and noncoercivity conditions. This contribution improves various existing results in the literature

The applicability of Grant's framework in the dynamic digital age: a review and agenda for future research

Purpose This paper aims to investigate the applicability of Grant’s framework in the current changing and dynamic environment. Design/methodology/approach In this paper, a critical review of Grant’s paper was conducted to identify the limitations and weaknesses of the framework, which prevent its effective application in the current digital age. Findings As a result, this paper presented a modified framework and four propositions to consider dynamic capabilities in the new turbulent environment and extend the relationships between a firm’s resources, capabilities, dynamic capabilities, competitive advantage and competitive strategy. Findings tied to this initiative will provide important contributions to research. Originality/value Rooted in resource-based view (RBV), the proposed framework puts forward a valid theoretical foundation on how to create a competitive advantage from a firm’s internal factors, including strategic resources, capabilities and dynamic capabilities. Furthermore, it contributes to RBV literature by considering dynamic capabilities, as the firms’ most crucial factors in the current dynamic digital market

Competitive strategy, dynamic capability and value creation: Some empirical evidence from the UK telecommunications firms

Main message: The overall interplay between competitive strategies and dynamic capabilities is an integral part of value creation in terms of novelty, lock-in, complementarities and efficiency. Short title: Competitive strategy, dynamic capability and value creation Key points: -In response to insufficient systematic research on the impact of competitive strategies and dynamic capabilities on value creation, this study expands prior studies (e.g., Rashidirad et al., 2013) by proposing carefully testable research hypotheses and empirically explore the research phenomenon. -This study analyses the complex interrelationships between competitive strategies and dynamic capabilities and the resulting impact on value creation through adopting a multidimensional approach in which each construct is decomposited to its dimensions, so the relationships between each dimension of the research constructs are investigated. -This study prompts rethinking of the impact of dynamic capability and competitive strategy on value creation in firms by using a multidimensional perspective

Effects of modulation techniques on the input current interharmonics of Adjustable Speed Drives

Adjustable speed drives (ASDs) based on a three-phase front-end diode rectifier connected to a rearend inverter may generate interharmonic distortion in the grid. The interharmonic components can create power quality problems in the distribution networks such as interference with the ripple control signals, and consequently they can hamper the normal operation of the grid. This paper presents the effect of the symmetrical regularly sampled space vector modulation and discontinuous pulse width modulation-30° lag (DPWM2) techniques, as the most popular modulation methods in the ASD applications, on the drive's input current interharmonic magnitudes. Further investigations are also devoted to the cases where the random modulation technique is applied to the selected modulation strategies. The comparative results show how different modulation techniques can influence the ASD's input current interharmonics and consequently may not be a suitable choice of modulation from an interharmonics perspective. Finally, the theoretical analysis and simulation studies are validated with obtained experimental results on a 7.5-kW motor drive system