Mauro Sampaio

A produção acadêmica publicada na revista Gestão & Produção de 1999 a 2010: tendências e direções para pesquisas futuras

This study is a review and evaluation of studies published in a Brazilian journal of management & production (G&P) from 1999 to 2010 in order to investigate the diversity of articles in terms of the purposes of research, data collection approaches, and data analysis techniques. The research articles were classified based on their primary purpose (theory building, application, and concepts), data collection approach (case study, qualitative research, archival research, survey-based research, laboratory research, and field research), data analysis technique (descriptive statistics, various multivariate statistical techniques, and mathematical modeling), and operations topics (strategy, quality, and supply chain management). The numbers of articles published increased substantially between 1999 to 2010. The focus of the articles on the manufacturing industry published in this journal changed considerably, and more recently the gap between the number of manufacturing and service-focused articles on production and operations management (POM) has reduced. While previous articles published in the G&P journal were based on conceptual descriptions, our results indicate that the journal has published articles based on theory and application. Case study is the most widely used method for data collection. Directions for future research in operations management were also discussed.

Logística reversa no comércio eletrônico: um estudo de caso

Reverse logistics has gained increasing importance among researchers and supply chain professionals not only for being one of the tools for sustainability, but also for its strategic role in many economic sectors. Several studies have shown how an efficient reverse logistics can reduce costs and provide competitive advantage to companies. Likewise, there has been a significant growth of electronic commerce in many countries, which has much higher return rates than those of traditional trade. Nevertheless, despite the importance of reverse logistics in electronic commerce, there are no studies addressing this topic in the literature. The aim of this paper is to describe the reverse logistics process of the largest online retailer in the Brazilian market by showing its development, analyzing its performance, and identifying its major deficiencies. Some suggestions for the improvement and implementation of a more efficient system are made Resumo: A logistica reversa ganha importância cada vez maior tanto no meio academico quanto entre os profissionais de supply chain, nao so por ser um dos instrumentos para a pratica da sustentabilidade, como tambem por seu papel estrategico em muitos segmentos economicos. Diversos trabalhos mostram como uma logistica reversa eficiente pode diminuir custos e propiciar vantagem competitiva as empresas. Da mesma forma, o comercio eletronico vem apresentando crescimento expressivo em muitos paises e, por sua propria natureza apresenta taxas de retorno muito maiores que o comercio tradicional. Contudo, apesar da importância da operacao de logistica reversa para o comercio eletronico, nao se encontram trabalhos que explorem esse tema na literatura. O objetivo deste trabalho e descrever o processo de logistica reversa do maior varejista virtual do mercado brasileiro, mostrando sua evolucao, analisando seu desempenho e identificando suas principais deficiencias. Conclui-se com a apresentacao de sugestoes para melhorias e implantacao de um sistema mais eficiente. Palavras-chave: Logistica reversa. Comercio eletronico.

Identificação dos fatores que afetam a ruptura de estoque utilizando análise de agrupamentos

O trabalho se propos a identificar as principais causas da ruptura de estoque por meio de uma analise de dados historicos da operacao de um grande varejista que atua no Brasil. Este estudo foi suportado por tecnicas de analise de agrupamento. O trabalho revelou que algumas causas da ruptura de estoque podem ser identificadas pela simples analise do banco de dados dos varejistas, contribuindo para tomadas de decisoes gerenciais.

Adaptação cultural e validação dos construtos: serviço logístico, satisfação e lealdade

This study aims to present the cross-cultural adaptation process of the constructs logistic service, satisfaction, and loyalty to the Brazilian culture. This adaptation process included the steps of translation, back translation, review by expert committee, pretesting, and analysis of validity and reliability. The study suggests that the constructs logistics service, satisfaction, and loyalty are reliable according to the Brazilian culture, but it was necessary to exclude 11 items from the list of 35 items identified in the theory. There is also evidence that the measures are valid as research instruments in Portuguese by the following methods: content analysis, convergent validity, discriminant validity, exploratory factor analysis, and confirmatory factor analysis.

Implementation of hybrid Kanban-CONWIP system: a case study

Purpose Shop floor control systems are generally major points of discussion in production planning and control literature. The purpose of this paper is to investigate how lean production control principles can be used in a make-to-order (MTO) job shop, where the volume is typically low and there is high variety. This paper examines the procedures involved in implementing a constant work-in-process (CONWIP)/Kanban hybrid system in the shop floor environment and also provides insights and guidelines on the implementation of a hybrid system in a high-variety/low-volume environment. Design/methodology/approach The authors review literature on Kanban, CONWIP, and CONWIP/Kanban hybrid systems to analyze how lean production control principles can be used in a MTO job shop. The second part focuses on the process of implementation. Using a case study of a manufacturer of electromechanical components for valve monitoring and controls, the paper describes how the operation is transformed by for more efficient shop floor control systems. Real experiments are used to compare pre- and post-improvement performance. Findings The study shows that the proposed hybrid Kanban-CONWIP system reduced the cycle time and achieved an increase of 38 percent in inventory turnover. The empirical results from this pilot study provide useful managerial insights for a benchmarking analysis of the actions to be taken into consideration by companies that have similar manufacturing systems. Research limitations/implications The statistic generalization of the results is impossible due to the use of a single case method of study. Originality/value This paper provides insights and guidelines on the implementation of a hybrid system in a high-variety/low-volume environment. The literature on real applications of hybrid CONWIP/Kanban by case study is limited.

Managerial response to stockouts: the effect of remedies on consumer behavior

Stockouts remain a significant problem for retail firms. Estimates of stockout rates in the past fifty years consistently averaged approximately 8 percent. The consequences of stockouts transcend the retail store to include its supporting supply chain. In addition to the effect on the behavior of consumers, stockouts can impact the firm’s replenishment policy, the level and location of inventories and the cost of emergency shipments required to replenish out-of-stock items. Although there is a substantive literature in logistics that measures the frequency of and the consumer response to stockouts, investigation of the effect of remedies on consumer response is sparse. To address this problem, the effectiveness of five remedies as tools to manage retail stockouts was investigated: apology, raincheck, home delivery, trade-up and discount. A remedy is an incentive to induce consumers to not leave a store in response to a stockout. In addition the influence of consumer characteristics (i.e., brand loyalty) and shopping situations (i.e., urgency of purchase) on the effect of each remedy on consumer behavior was examined. The results suggest that the remedies are usually effective. The most effective remedy is home delivery. The least effective remedy is a simple apology, which may actually increase the percentage of consumers leaving the store. The results also indicate that the urgency of the purchase and store loyalty have the most impact on remedy effectiveness. These results suggest that there are significant opportunities to use remedies as tools to manage the effect of stockouts on retail stores and their supporting supply chains.

An exploratory study on the returns management process in an online retailer

ABSTRACT The returns management process is gaining increasing importance both in academia and among supply chain professionals, not only as a tool in the practice of sustainability, but also for its strategic role in many economic sectors. Several studies show how efficiently returns management can reduce costs and provide a competitive advantage to companies. Likewise, electronic commerce, or e-commerce, has shown significant growth in many countries and, due to its very nature, it presents much higher return rates than traditional trade. However, despite the importance of returns management operation for electronic commerce, few studies explore this theme in the literature. The aim of this paper is to describe the process of returns management of the largest online retailer of the Brazilian market, showing its evolution and analysing its performance, as well as identifying its main shortcomings. We conclude with suggestions for improvements and the implementation of a more efficient system.

Métodos de cotação e negociação na cadeia de suprimentos de autopeças brasileira e os custos de transação

O presente trabalho tem por objetivo principal identificar quais sao os metodos de cotacao e negociacao de precos predominantes na cadeia de suprimentos de autopecas brasileira. Ainda dentro do escopo do trabalho, buscou-se determinar como as caracteristicas dos metodos de cotacao e negociacao de precos utilizados na cadeia de suprimentos de autopecas brasileira afetam os custos de transacao. O interesse recaiu sobre a cadeia de suprimentos de autopecas do Brasil devido a sua complexidade, atualizacao tecnologica e crescimento acentuado nos ultimos anos. Para alcancar os objetivos foi executada pesquisa tipo survey, com questionario enviado aos gestores da area de supply chain das 100 maiores empresas fabricantes de autopecas. Das respostas obtidas concluiu-se que as maiores empresas da cadeia de suprimentos de autopecas em termos de faturamento, com capital multinacional, empregam uma gama mais variada e estruturada de metodos de cotacao e negociacao de precos para aquisicao de materiais diretos. Por outro lado as empresas de capital nacional empregam majoritariamente metodos mais simples de cotacao e negociacao de preco. O trabalho apresenta tambem, com base nas caracteristicas principais dos metodos de cotacao e negociacao identificados, a percepcao dos gestores de supply chain das empresas pesquisadas acerca da influencia dessas caracteristicas nos custos de transacao.

Método híbrido CONWIP/KANBAN um estudo de caso

Production control systems have been widely discussed in the Production Engineering literature. The KANBAN system is the most known among professionals for the control and processing of materials in the shop floor environment due to its simplicity and competitive significance in the design of the Toyota production system. Analyzing possible disadvantages presented by this system, the CONWIP demonstrates that the KANBAN can be questioned in certain circumstances and upon certain variables of the product, demand, or production. The objective of this research is to Investigate, compare, and point out the advantages and disadvantages of KANBAN, CONWIP, and the CONWIP/KANBAN Hybrid Method. Based on the case study in a company that manufactures electromechanical components for valve monitoring and control, characterized by small lots, high customization, and uncertain demand, these methods were discussed in order to show, through the results, the differential combination of KANBAN and CONWIP in the CONWIP/KANBAN Hybrid method.