Renato da Silva Lima

Perspectives and relationships in Supply Chain Simulation: A systematic literature review

Abstract The main purpose of this article is to develop a meta-analysis about the relationships and potential perspectives of modeling and simulation in supply chains. The research methodology used in this paper was a systematic literature review, exploring the state of the art in Supply Chain Simulation. The methodological procedures were based on a systematic literature review and statistical analysis of a sample of papers. The results indicated that modeling and simulation in supply chains can be better integrated. The models could be more sophisticated to capture the dynamics and behavior of these networks. The combination of optimization methods with agent-based simulation is an observed trend. Hybrid simulations involving normative models and empirical applications can be useful to represent the reality of supply chains, generating alternative solutions that improve supply chain performance. The relevance of this article is to analyze the interfaces related to this field of research, in order to establish a theoretical framework that improves the process of modeling, simulation and decision-making in supply chains.

Arc Routing Using a Geographic Information System: Application in Recyclable Materials Selective Collection

This study aims to utilize a Geographic Information System (GIS) as an arc routing tool (door-to-door model) for a recyclable materials selective collection program. The investigation uses real data from material gatherers association in the city of Itajubá, Minas Gerais, Brazil. The research method is modeling and simulation. TransCAD 4.8 is used because it possesses an arc routing routine. Scenarios were simulated in which the most efficient routes were sought (shortest and fastest) in comparison with the associations real trajectories, which were collected in the field of study by means of a Global Positioning System (GPS) device. The results obtained, when compared to the current system, showed better performance (distance, time and volume of material). Thus, by using a GIS, it can be said the main logistics problems in the gatherers association are direct consequences of poor structuring.

Impact of Transportation Policies on Competitiveness of Brazilian and U.S. Soybeans: From Field to Port

Because of increased international consumption, soybeans have become one of the worlds top commodities. Brazil and the United States, the worlds two largest soybean exporters, possess unique agricultural commodity infrastructure schemes for production and transportation. The goal of this paper is to examine the differences between transportation systems and infrastructure of the two countries, and look at how these differences affect their respective commodity transportation policies. A theoretical overview of the essential role transportation plays in business logistics is followed by an analysis and comparison of the Brazilian and U.S. transportation systems. Drawing on previous U.S. Department of Agriculture studies of U.S. and Brazilian commodity transportation, landed cost price formation analyses are performed, taking into account production, internal transportation, and freight tariffs. Examples of landed cost price formation are also given to enrich the information provided. It is shown that in certain cases Brazilian internal soybean transportation costs can represent 230% more than those of the United States. On the basis of the literature review, the effect of transportation policies on the total landed cost of soybeans on the world marketplace are examined, as are reasons for why Brazilian soybeans suffer a competitive disadvantage from field to port. The current situation and what could be done to potentially improve Brazilian internal transportation policies is also discussed.

Roteirização em arcos com um sistema de informações geográficas para transportes: aplicação em coleta de resíduos sólidos urbanos

O objetivo do trabalho e utilizar o Sistema de Informacoes Geograficas (SIG) como ferramenta para a roteirizacao do sistema de coleta residuos solidos urbanos (RSU). A partir da base de dados geograficos do sistema viario de Itajuba (MG), foram georeferenciadas os dados relativos a coleta de RSU da empresa responsavel por prestar o servico na cidade. De posse desses dados, foram simulados no SIG cenarios de roteirizacao nos setores de coleta, utilizando a rotina de roteirizacao em arcos do SIG. As simulacoes possibilitaram avaliar a qualidade das rotas atuais e possiveis cenarios de melhoria, visando a minimizacao da distância percorrida e, consequentemente, a reducao dos custos envolvidos. Os resultados gerais mostraram que a rotina de roteirizacao presente no SIG e adequada e oferece resultados de boa qualidade, desde que as variaveis mais sensiveis do problema (taxa de geracao de residuos e velocidade dos caminhoes) sejam obtidas com precisao.

URBAN SOLID WASTE MANAGEMENT BY PROCESS MAPPING AND SIMULATION

Adequate management of urban solid waste (USW) is beneficial to the environment, cities and people who depend on the income generated from collecting this waste material to survive. Due to the level of complexity of these processes involved in recyclable USW sorting, management tools which enable systemic studies become valuable assets by evaluating the effects changes may cause on the organization. This paper presents a modeling study, which used process mapping and discrete event simulation, in which a USW collection process was evaluated. The study was conducted in conjunction with the USW trash gatherers association of Itajuba, state of Minas Gerais, Brazil. The lack of standardized processes presented difficulties for developing the simulation model. To diminish this problem, three conceptual modelingtechniques were used (SIPOC, flowcharts and IDEF-SIM). Data were collected via observation, interviews and questionnaires. The validated conceptual model, obtained in this study, will be able to be used to better understand the process. Finally, the model was used to evaluate process improvement scenarios.

Análise da distribuição física e roteirização em um atacadista

The objective of this work is to analyze the physical distribution in a company of the wholesale market, with special attention on its vehicle routing and scheduling process. In this manner, a case study in a wholesale, placed in the south of Minas Gerais state, was carried out. This study related the practical aspects of the operational routines established in literature specialized technique. As general conclusion, it can be affirmed that the company despite using diverse concepts and tools to support its physical distribution processes is still hostage of the lack of information in technical simple operational processes, as the accurate road distances between the customers. Consequently, it is observed that the process is rather rationalized other than optimized and, in diverse stages, excessively dependent of practical experience of the involved personnel.

Promoting More Efficient Use of Urban Areas in Developing Countries: An Alternative

Planners can apply a relatively simple and user-friendly tool to control the expansion of urban areas in developing countries. This tool, presented here, is based on a traditional accessibility index, which may be taken as a measure of urban development. The entire process of construction and analysis of the networks based on the accessibility index was carried out using a geographic information system for transportation (GIS-T). The tool has been tested in Sao Carlos, a medium-sized Brazilian city, in which the effects of some proposed real estate developments on the accessibility patterns have been studied. The results of this application show that the tool is suitable for selecting the best site for a new development among many alternatives, promoting more efficient use of the urban area.Planners can apply a relatively simple and user-friendly tool to control the expansion of urban areas in developing countries. This tool, presented here, is based on a traditional accessibility index, which may be taken as a measure of urban development. The entire process of construction and analysis of the networks based on the accessibility index was carried out using a geographic information system for transportation (GIS-T). The tool has been tested in São Carlos, a medium-sized Brazilian city, in which the effects of some proposed real estate developments on the accessibility patterns have been studied. The results of this application show that the tool is suitable for selecting the best site for a new development among many alternatives, promoting more efficient use of the urban area.

Pesquisa levantamento para análise do modelo de compras conjuntas adotado em arranjos produtivos locais de Minas Gerais

Although purchasing supplies represents a significant cost for many companies, the proper management of procurement function and relationships with suppliers can ensure greater competitiveness for their products and services, thus bringing better results to shareholders. However, this advantage still seems to be a privilege of large organizations. For internal and external constraints, small and medium companies are outside both the supplier relationship management and the correct management of purchases. Small and medium companies, when they aim to overcome the various managerial or technological limitations (among them the limitations related to supply chain management), can organize clusters that primarily work in the industrial sector. Companies that exist within a specific sector where there is both competition and practical cooperation create these organized clusters. Among these practices, the share and union of purchasing through the practice of cooperative purchasing can be called the main practice. From this context, the objective is to analyze the models for cooperative purchasing that have been adopted by manufacturing clusters and retailers buying offices, focused on the state of Minas Gerais. Thus, a research survey was created and distributed among companies belonging to industrial clusters in the state of Minas Gerais. The results conclude that, in general, joint procurement in Local Productive Arrangements Miners is very weak and unsystematic.

An analysis on logistics risk management: Tools, techniques and review

The aim of this article is to analyze logistics risks from tools applied in risk management phases. A systematic literature review was the main research method. A sample of conference proceeding papers was formed from the IEEE Xplore Digital Library database. The core results show that mathematical modeling was the scientific method most applied by authors in literature. Logistics outsourcing was the primary topic, also identified as the central type of risk. Risk ranking indexes were employed as the main logistics risk measures. Multi-criteria methods, for instance, Fuzzy Comprehensive Evaluation and AHP were the focal tools applied, especially in the risk assessment phase. As a future research direction we suggest the combined use of simulation-based optimization to support the logistics risk management.

Gestão de relacionamento com fornecedores em arranjos produtivos locais: o caso do Vale da Eletrônica

This study examines the supplier relationship management (SRM) through the approach of Olsen & Ellram in five small and medium enterprises located in the Electronics Valley Cluster, Brazil. It is an exploratory descriptive study with data collection performed through interviews with executives of these five companies. It was possible to conclude that there is a strong need for technology partnerships with suppliers because of the possibility of competitiveness growth associated with supplier technology. However, relationships with suppliers are still incipient and informal, with no support strategies and systems integration. Because of the use of high technology inputs, integration with suppliers presents a great potential to improve the competitiveness of the enterprises in this cluster. However, in order to foster this potential, the cluster and its institutions need to develop incentive policies and joint actions.