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Nowadays, stock management became a strategic decision used by organizations due to the high impact it has on the overall performance of supply chains. This paper evaluates the impact of the implementation of a R, S inventory policy in the finances of a distribution network. The research involves the functioning of a hardware supply chain conformed by a retailer and a manufacturer, which is simulated trough system dynamics. The main results of the study validate the positive impact that the policy about network liquidity have. Likewise, it is possible to determine the dominance of parameters such as demand, the review period and the maximum production capacity over the overall performance of the system. [ABSTRACT FROM AUTHOR]

The restrictions of installed capacity and distribution resources to which medium and large manufacturing companies are normally subject, make it necessary to establish methods that serve as a tool to make decisions regarding the prioritization of each of their warehouses at the time of supplying them. the importance that the distribution center assigns to each of these, is closely related to the conditions and particularities that characterize them, being these factors of a qualitative, quantitative or a mixture between the two. This article presents a fuzzy QFD multi-criteria method which, in addition to using quantitative variables to establish the order of dispatch of the finished product, considers qualitative variables, the result of the opinions that experts can offer about the particular situations of each winery by means of linguistic variables that are finally quantified through fuzzy triangular numbers. [ABSTRACT FROM AUTHOR]

In this research a methodology based on multi-criteria decision analysis for the evaluation and selection of infrastructure energy smart metering in the Colombian context is presented. The selection process of these measurement infrastructures covers additional technical and financial criteria, becoming a complex problem. The methodology used in this work is the technique called Analytic Hierarchy Process (AHP) that considers seven assessment criteria (Technology, Finance, Environmental, Regulatory, Political, Infrastructure and Socio- Cultural). Of these assessment criteria, emerge 25 sub-criteria, which are integrated in a hierarchical structure to evaluate three energy smart metering alternatives. Nine experts were consulted to obtain the results. The results show the versatility of AHP method for making complex decisions with respect to the implementation of energy smart metering infrastructure, and provide a useful guide for assessing Smart Grid projects through multi-criteria analysis. [ABSTRACT FROM AUTHOR]

This paper propose an additional plan of production in a Company, including employees in a handicap condition, which will count with different times to execute the different tasks and sometimes incompatible in specific activities. The Model of mixed integer linear programming seeks to maximize production as well as the respective cash flow. The tributary benefits of the Colombian government associated to the inclusion of handicap condition personnel, are considered for the model. The Model is validated with a case study. [ABSTRACT FROM AUTHOR]

The supplier performance measurement is a very important aspect in the supplier management because which is defined if they are complying or not contractual arrangements and if complying with the parameters of performance expected for the successful the company's operations. Additionally, as a result of the evaluation can be defined improvement plans and strategies for negotiating with suppliers, which aims to ensure the successful operation of the firm. In this paper we propose a model designed for evaluating suplier performance, using Analytic Hierarchy Process (AHP), which has proven be effective tool to make a multicriterion decision. We show principals results of this application. [ABSTRACT FROM AUTHOR]

Objective: This study aims to propose a methodology that identifies and prioritizes the operational risk factors in a supply chain (SC) to provide a tool according to the process-based SC approach that is useful for risk assessment throughout the SC. Materials and methods: Risk identification was conducted by a scenario analysis, which linked the risk factors with the standard key performance indicators (KPIs) of the processes and logistics activities proposed by the supply chain operational reference model (SCORM o SCOR). These influence relationships were quantified using a proposed scale, and then, the risk factors were prioritized by the definition of their influence levels. This approach was applied to a real SC. Results and discussion: Twenty risk factors were clearly and effectively identified, analyzed and prioritized, and priority was given to those with the highest influence level, which can be understood as the risk factors that have a larger capacity to negatively affect SC performance. Conclusions: The methodology allows the identification of the most influential risk factors in a SC, and as it is based on a standard model, it fosters a collaborative analysis among its echelons. The main contributions of this paper are the risk identification by means of the KPIs of the SCOR model and the measurement of their influence levels, which is a new and useful feature for risk prioritization. [ABSTRACT FROM AUTHOR]

As important as the selection of a supplier and in this particular case a strategic ally for the logistics operation of a company (3PL supplier), is to know if the performance of this ally is in line with what was expected in the selection process. Considering this importance, a methodology is proposed to evaluate the performance of a logistics service provider. The proposed methodology considers scientific and analytical elements to define a set of criteria which include not only the most important features of services container transport, but also those competences which may affect the development and sustainability of a strategic alliance. Those criteria are described and it has associated sub-criteria and indicators too, with their respective measurement frequency. Then, the criteria are weighted using the basic AHP methodology. In the next place, all those items are recorded in a format designed to make the final assessment ally, in order to proposed model. [ABSTRACT FROM AUTHOR]

Given the current economic climate, many companies are considering outsourcing some activities to reduce costs and to focus on their core competency; thus, by adopting a competency-focused approach they enhance their chances to survive in a growing and competitive market. Third-Party Logistics (3PL) is a system that facilitates logistic activities. First, however, the organizations need to assess which companies are suitable for outsourcing. The aim of this paper is to depict a structural system for 3PL selection and validate it in real-world automobile companies. We use the Delphi method to determine criteria for 3PL selection and apply Evaluation by an Area-based Method for Ranking (EAMR) to prioritize the candidate alternatives. This method is used in combination with a Shannon Entropy based approach for determining the required weights. Computational analysis shows which criteria and companies have high priority, and based on that candidate alternatives for outsourcing are evaluated. The results suggest how automobile companies select 3PL companies and allocate their work to them. [ABSTRACT FROM AUTHOR]

Introduction: Fast population growth has generated an increase in the consumption and therefore it has influenced the rise of the solid waste generation, which causes adverse effects on the environment if treated inadequated. Polyethylene terephthalate (PET) is a kind of solid waste generated that is 100% recyclable, however it is ending in landfills reducing the lifespan of them and consuming resources like petroleum in order to generate new products. Objective: Evaluating the effect on the environment of PET recycling by means of a system dinamics model. Material and method: The variables considered were water and energy consumption, CO2 emissions and landfill lifespan varying the PET recycling rate. RESULTS: the increase of the recycling rate cause a decrease in water and energy consumption as well as de CO2 emissions and produce a rise in the landfill lifespan. Conclusions: It is still important to follow the acomplishment of the solid waste management policies so as to enhace the decision making process related to generate a positive impact on the environment. [ABSTRACT FROM AUTHOR]

Control charts are the main tool in the process control. They have been widely used and are still used in most manufacturing processes. However, proposals have emerged that seek to improve their performance, mainly about topics which involve the vagueness and uncertainty of the data. In this sense, fuzzy control charts area an important alternative for improve the performance of control charts. We present a comparison of Shewhart control charts (traditional) and fuzzy control charts for attributes with the aim of establishing similarities and differences between the two methodologies. We develop a numerical example for a c traditional chart and fuzzy charts these built with different methods: Fuzzy mode, fuzzy median and fuzzy midrange and the direct fuzzy approach, then we do the comparison used the rules for evaluation of patterns of not natural behavior in the control charts. From the results of the comparison carried out in this research, it is concluded that when using the evaluation rules for both graphs with the data used, no differences are obtained in the results. [ABSTRACT FROM AUTHOR]

In this paper, a system dynamics model is designed. This model, together with some management indicators is used to measure the impact of recycled material in an industry. This, in order to provide best elements in decision making process related to the management of raw materials stocks. For this purpose, a review of the main elements that influence the production plan of a business case study is performed. Thus, a characterization of the industry and subsequent configuration of the structure and relationships of the system is obtained, in order to model and simulate using the software Vensim DSS. From these simulations, a review and analysis of the system behavior, as well as variations proposed, in different scenarios and changes in relevant parameters, is executed. At the end, a model that illustrates the behavior of inventory levels of different types of materials as well as the values of some logistics and energy indicators is obtained, revealing the important work ahead in recycling on the region of Valle del Cauca, Colombia. [ABSTRACT FROM AUTHOR]

This article presents a system dynamics model which evaluates the environmental impact caused by the reverse logistics of car tires. System dynamics is used to explain the behavior of the emissions generated by four processes, the production of new tires, retreading, mechanical crushing and co-processing, the last three refer to processes where you can use the tires once these become waste. The environmental impact of reverse logistics network allows the analysis of different environmental variables that characterize the system, among which are the carbon dioxide emissions, oil consumption and water consumption. Different scenarios are also analyzed to evaluate the sensitivity of the proposed model and identify the disposal that generate more and less contamination, as well as to recognize the production process that reduces emissions. [ABSTRACT FROM AUTHOR]