Clusters and supply chain management: challenges and obstacles

Purpose: This paper provides an insight into cluster supply chain (CSC) management by identifying challenges and obstacles in the design, implementation and improvement of CSC. This evaluation aims to propose future research directions for the management of CSC. Research Approach: A systematic review of published research on CSC management between 2006 and 2013 is conducted in order to round up previous research in this area and identify the gaps in the design, implementation and management of CSC; up on which the paper closes with a proposed agenda for future work. Findings and Originality: There is a limited understanding of the supply chain cluster concept and the implementation of its practices in addition to the lack of studies that focused on how to model, manage and improve the performance of CSC. Therefore, this paper would contribute to knowledge by providing an insight into CSC management and identifying future research directions for developing SC cluster theories in order to maximize the integration of supply chain and accordingly improving the performance of firms. Research Impact: A limited number of studies have been conducted to demonstrate the potential impact of CSC. The previous research did not provide a comprehensive review focusing on the evolution and the development of CSC idea. The review in this paper will summarise the research up to now in CSC area in order to identify challenges and obstacles in the design, implementation and improvement of CSC and propose future research directions. Practical Impact: This paper helps companies to understand benefits that can be raised from creating CSC and gives them directions for improving their capabilities to create CSC and select SC partners, which consequently help in increasing their competitiveness in terms of enhancing performance and increasing sustainability

Sato-Crutchfield formulation for some Evolutionary Games

The Sato-Crutchfield equations are studied analytically and numerically. The Sato-Crutchfield formulation is corresponding to losing memory. Then Sato-Crutchfield formulation is applied for some different types of games including hawk-dove, prisoner's dilemma and the battle of the sexes games. The Sato-Crutchfield formulation is found not to affect the evolutionarily stable strategy of the ordinary games. But choosing a strategy becomes purely random independent on the previous experiences, initial conditions, and the rules of the game itself. Sato-Crutchfield formulation for the prisoner's dilemma game can be considered as a theoretical explanation for the existence of cooperation in a population of defectors.Comment: 9 pages, 3 figures, accepted for Int. J. Mod. Phys.

Theoretical de Haas-van Alphen Data and Plasma Frequencies of MgB2 and TaB2

The de Haas-van Alphen-frequencies as well as the effective masses for a magnetic field parallel to the crystallographic c-axis are calculated within the local spin density approximation (LSDA) for MgB2 and TaB2. In addition, we analyze the plasma frequencies computed for each Fermi surface sheet. We find a large anisotropy of Fermi velocities in MgB2 in difference to the nearly isotropic behavior in TaB2. We compare calculations performed within the relativistic non-full potential augmented-spherical-wave (ASW) scheme and the scalar-relativistic full potential local orbital (FPLO) scheme. A significant dependence for small cross sections on the bandstructure method is found. The comparison with the first available experimental de Haas-van Alphen-data by Yelland et al. (Ref. 19) shows deviations from the electronic structure calculated within both L(S)DA approaches although the cross section predicted by FPLO are closer to the experimental data. The elucidation of the relevant many-body effects beyond the standard LDA is considered as a possible key problem to understand the superconductivity in MgB2.Comment: Typos corrected, 3references added. Extended and corrected version of S. Elgazzar et al., Solid State Comm. v. 121, 99 (2002). 7pages, 4figures, AIP Conference Proc. "Correlated Electron Systems and High-Tc Superconductors" (ed. F. Mancini) (October 2001, Salerno, Italy

On differences between fractional and integer order differential equations for dynamical games

We argue that fractional order (FO) differential equations are more suitable to model complex adaptive systems (CAS). Hence they are applied in replicator equations for non-cooperative game. Rock-Scissors-Paper game is discussed. It is known that its integer order model does not have a stable equilibrium. Its fractional order model is shown to have a locally asymptotically stable internal solution. A FO asymmetric game is shown to have a locally asymptotically stable internal solution. This is not the case for its integer order counterpart.Comment: 4 page