Volume 9, Issue 2

Supply Network Design by Using Clustering and Mixed Integer Programming

Nicolás Clavijo Buriticá, John Wilmer Escobar, Rafael Gutiérrez

The Supply Network Design represents one of the high impact strategic decisions in competitiveness for companies. An optimal location of facilities in relation to the capacity of supply and demand, allows a high level service to attend the markets. In this paper, a methodological framework for designing supply networks by joining application of clustering techniques and mathematical programming are presented. The proposed methodology has been tested with real data obtained from a company of non-alcoholic beverages in Colombia. The approach considers three main stages. First, the costumers clustering process is performed by K-means in order to obtain the location for potential Distribution Centers (DC’s). In the second stage, the model for supply network design is performed using a Mixed Integer Programming (MIP) by considering different options to assign DC’s, and finally the valuation of the proposed methodology on a real case. A distribution scheme, which allows enter to new market areas with an efficient strategy to penetrate products to big cities such as Bogotá in Colombia, was found.

 

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Mathematical Simulation and Thermal State Analysis of Combustion Chambers for Power Systems

Alexander V. Kretinin, M.I. Kirpichev, Semen Podvalny, Mitar Lutovac, E.S. Podvalny

Some problems of thermodynamic, hydraulic and thermal calculations of the thermal state analysis and performance of the liquid-propellant rocket engine design using neural network modeling are detected. The algorithm of the numerical decision of the hydrodynamics equations with representation of the decision on method of weighted residuals on the base of general neuronet's approximation in the whole flow area is developed. There are presented some applications of neural-network algorithms used in thermal calculations of the LRE chamber such as the simulation of hydraulic non-uniformity of fuel distribution among the sprayers of LRE mixing devices..

 

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The Implementation of ERP and MES Systems as a Support to Industrial Management Systems

Dalibor Berić, Darko Stefanović, Bojan Lalić, Ilija Ćosić

The improvement of the processes within the production system is the need of each company in order to enable better monitoring and control, as well as to provide all real-time information that are important for the decision-making process, in order to improve all processes and simultaneously control all elements of the process. Some of the systems that provide process monitoring are Enterprise Resources Planning-ERP and Manufacturing Execution Systems (MES) systems, but they are often not sufficiently integrated. The aim of this paper is to explore the needs of users of ERP and MES systems as well as the processes of implementation and integration of the new MES system into an already existing ERP system in a single automotive industry, with all the benefits for the users of the system that a company can achieve by implementing a well-implemented software solution.

 

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U-Shaped Cells Operating Modes: a Review and a Hands-on Simulation Comparison

Anabela Carvalho Alves

Increased demands of different products put some challenges to the production system layout that are not well addressed by the job-shop neither flow-lines layout. Cellular production is a production system layout that enables higher productivity than job-shop and greater flexibility than flow-lines and it is appointed as a better layout to face the product and volumes changes occurring in the companies. The cells design involves the operating mode selection for the U-shaped cell. Operating modes are the way the operators are organized inside a cell. This could take the form of working balance, baton touch, rabbit chase, bucket-brigades or Toyota Sewing System (TSS). This paper reviewed these Ushaped cells operating modes attending to the literature and also using some industrial case studies from real implementations in companies working with cells. For comparing the operating modes a hands-on simulation was performed by student teams in the classroom. This method was used so that it could be possible to simulate aspects related with operators: skills, teamwork, cross-training or motivation. The operating modes were compared through some performance measures like production output, productivity, efficiency, WIP and defects. The operating modes have some similarities and dissimilarities and knowing them it is possible to select an adequate operating mode for a specific production environment. This research could

 

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Nanostructure of Orthodontic Adhesives

Vladan D. Mirjanić, Đorđe D. Mirjanić

Nanostructure of the orthodontic adhesives for bonding brackets to teeth most frequently used nowadays in clinical procedure is analyzed by way of Atomic Force Microscopy (AFM). Study was done on 5 orthodontic adhesives. After determining the properties of adhesive, a correlation was determined between the nanostructure of tested adhesive and the strength of tooth bracket interface. Based on AFM images of analyzed adhesives, and by way of correlations of arithmetic means of debonding strength (I) and the average adhesive roughness (Ra, Rq, Rz), it has been concluded that with an increase of average adhesive roughness’s, increases the debonding strength. (I). It was observed that with all the roughness parameters (Ra, Rz, and Rq), the strongest bond and theweakest bond was determined Higher roughness of Resilience Orthodontic bonding solutions at the nano level is probably enabled by a bigger number of thorns that penetrate into micro concaves formed under the influence of acids. Higher roughness is a consequence of chemical structure itself of the composite material.

 

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Improvement in Public Administration Services: a Case of Business Registration Process

Roy Andersson, Eduardo Bridi, Yinef Pardillo Baez, Mauricio Uriona Maldonadom, Fernando Antonio Forcellini, Fabio Cesar Moraes

This work addresses the process of opening enterprises (grant of license) in a municipality. The purpose is to perform the identification, analysis and redesign of the process of granting permits to private companies, then making a proposal for improvement. The chosen method was a case study, using a qualitative approach according to the BPM methodology to respond: how to improve and accelerate the grant of a license? As a result, the proposed model used the best practices for business registration to reduce the time to 70%, and using half of the involved sectors. The conclusion is that it is possible to reduce

 

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