A multi-objective model for inventory and planned production reassignment to committed orders with homogeneity requirements

[EN] Certain industries are characterized by obtaining non-homogeneous units of the same product. However, customers require homogeneity in some attributes between units of the same and different products requesting in their orders. To commit such orders, an estimation of the homogeneous product to be obtained can be used. Unfortunately, estimations of homogenous product quantities can differ considerably from real distributions. This fact could entail the impossibility of accomplishing the delivery of customer orders in the terms previously committed. To solve this, we propose a multi-objective mathematical programming model to reallocate already available homogeneous products in stock and planned production to committed orders. The main contributions of this model are the consideration of the homogeneity requirement between units of different lines of the same order, the allowance of partial deliveries of order lines, and the specification of some relevant attributes of products to accomplish with the customer homogeneity requirement. Different hypotheses are proved through experiments and statistical analyses applied to a ceramic tile company. The epsilon-constraint method is used to obtain an implementable solution for the company. The weighted sum method is used when proving other hypotheses that offer some managerial insights to companies.This work was supported by the Program of Formation of University Professors (FPU) of the Spanish Ministry of Education, Culture and Sport (FPU15/03595), and by the Spanish Ministry of Economy and Competitiveness Project DPI2011-23597.Esteso, A.; Alemany Díaz, MDM.; Ortiz Bas, Á.; Peidro Payá, D. (2018). A multi-objective model for inventory and planned production reassignment to committed orders with homogeneity requirements. Computers & Industrial Engineering. 124:180-194. https://doi.org/10.1016/j.cie.2018.07.025S18019412

National identity and elite interests: Makarios and Greek Cypriot nationalism (1967-1974)

Within the field of Nationalism Studies, the relationship between “National Identity” and “ethnicity” has been widely studied. Likewise, the relationship between “National Identity”, “elite interests” and “ethnic conflicts” has also been investigated. In fact, there is a considerable amount of studies focused on the “inter-state” aspects of “National Identity”, “ethnicity” and “elite interests”, however, such studies tend to highlight the “elite” of the “homeland” as the political and social leaders of their ethnicity; seeing themselves responsible for defending the political interests of their ethnic relatives in transnational borders, or liberating them from other states via “secessionist” or “irredentist” policies. Nevertheless, an example of elite of “ethnic kin”, who dominates another state outside its “homeland”, has not yet been widely theorized academically, with a focus on “National Identity” and “elite interests”. This study aims to fill that gap within the literature through the example of President Makarios and Greek Cypriot nationalism. While Cyprus was a British colony, the Greek Cypriot community was mobilized to unify Cyprus with their “homeland” Greece. However, the result of such mobilization was the foundation of a Cypriot state, based on power-sharing between the Greek Cypriot majority and Turkish Cypriot minority. In the post-Independence era, particularly with the consolidation of the military dictatorship in Greece (1967), President Makarios abandoned the Enosis (unification of Cyprus with Greece) policies and made attempts to reconstruct the Greek Cypriot National Identity in favour of a Greek Cypriot-ruled independent Cypriot state. President Makarios also ignored Greek Junta's manipulations about the Cypriot politics. The subsequent struggle continued until the Athens-led coup d'état that overthrew the President (1974). This thesis shall follow Brass’ “Instrumentalist” theory and shall analyze the reconstruction of the Greek Cypriot National Identity. The thesis will also investigate the role played by the interests of both the President and the Greek Cypriots in constructing this new National Identity

Polyphenol content in selected Turkish wines, an alternative method of detection of phenolics

Wine is an important source of dietary antioxidants, due to its content of phenolic compounds. Amount of phenolics in red wines of Turkey were investigated by using electrodes prepared via immobilisation of tyrosinase. Immobilisation was performed by entrapment during electrochemical synthesis of conducting copolymers. Results were compared with Folin-Ciocalteau method. It was found that use of enzyme electrodes is an alternative and cheap method in determining the phenolics in wines. Storage temperature before bottling was also discussed in terms of phenolic amount

Immobilization of invertase in conducting polypyrrole/PMMA-co-PMTM graft copolymers

In this study, invertase was immobilized in copolymer electrodes constructed. Three different types of polymethyl methacrylate-co-polymethyl thienyl methacrylate matrices were used to obtain copolymers that were characterized by FT-IR spectroscopy. Immobilization of enzymes was carried out by the entrapment of the enzyme in conducting polymer matrices during electrochemical polymerization of pyrrole through thiophene moieties of polymers. Immobilization of the enzyme was achieved by application of 1.0 V constant potential on a platinum electrode for 30 min in solution. The effects of temperature and pH on the activity of the enzyme electrodes were examined and operational stability studies were done. The changes in the maximum reaction rate and the variations in the Michaelis-Menten constant were studied. (C) 2005 Wiley Periodicals, Inc

Preparation and characterization of conducting polybutadiene/polythiophene composites

Conductive composite films of cis-1,4-polybutadiene (PBD) with polythiophene, (PTh) were prepared electrochemicallly. Thiophene was polymerized on PBD-coated platinium electrodes. The composites with different PTh percentages showed conductivity in the order of 10(-3) (Omega cm)(-1). The characterization of the films was performed using FTIR, scanning electron microscope and differential scanning calorimetry techniques. In order to understand the dominant transport mechanism, the temperature dependence of conductivity was investigated

Determination of phenolic compounds in wines with enzyme electrodes fabricated by immobilization of polyphenol oxidase in conducting copolymers

A copolymer of pyrrole with a new monomer (MBTA) containing an ester group derived from 3-thiophene acetic acid and (S)-(-)-2-methylbutanol was used as the matrix for immobilization of polyphenol oxidase. Enzyme electrodes were constructed by entrapment of enzyme in the conducting copolymer during the electrochemical polymerization of pyrrole. The performance of enzyme electrodes was optimized by examining the effects of pH and temperature on enzyme activity. The changes in the maximum reaction rate (V-max) and Michaelis-Menten constant (K-m) upon immobilization were investigated in addition to shelf-life and operational stability. By using these enzyme electrodes the total amount of phenolic compounds in red wines of Turkey was also analyzed