Hugo Tsugunobu Yoshida Yoshizaki | Universidade de São Paulo (original) (raw)

Papers by Hugo Tsugunobu Yoshida Yoshizaki

Logistics, Mar 4, 2022

This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY

Operations Management for Social Good, 2019

This study presents the management of over 5000 tons of debris generated in the fire in Largo do ... more This study presents the management of over 5000 tons of debris generated in the fire in Largo do Paissandu, Sao Paulo/Brazil, 2018. The process lasted 12 days and the debris was sent to a construction and demolition landfill without prior segregation, not abiding by the best practices in disaster waste recovery.

Supply Chain Management and Logistics in Emerging Markets, 2020

Several design considerations for this type of auctions are reviewed, as well as the mathematical... more Several design considerations for this type of auctions are reviewed, as well as the mathematical formulation to determine the best alternative (i.e., winner) that can be solved using simple tools like Microsoft Excel. The models are optimized by a mixed-integer programming, and the multi-attribute one is developed using multi-criteria decision analysis (MCDA). All three models developed in this research showed superior results compared to the baseline, being between 9% and 20% more efficient than a regular supplier selection (singly choosing the lowest price) and improving the bidding compliance.

Revista Brasileira de Gestão e Desenvolvimento Regional, Feb 4, 2014

Mesmo em tempos de desenvolvimento sustentável, o consumo mundial de energia ainda é bastante dep... more Mesmo em tempos de desenvolvimento sustentável, o consumo mundial de energia ainda é bastante dependente dos combustíveis fósseis, o que também ocorre no Brasil. A descoberta de petróleo e gás natural em toda a costa litorânea do país surge como um mecanismo de progresso indicando novas perspectivas em várias atividades econômicas e consequentemente, gerando o desenvolvimento regional em torno das novas áreas de exploração. Este artigo trata especificamente das descobertas na Bacia de Santos e as exigências de adaptação no contexto urbano, ambiental, das infraestruturas e tecnologia, a fim de que o pleno potencial dessa exploração possa ser efetivamente convertido em avanços sociais em especial para a região metropolitana de Santos.

Revista Produção Online, 2022

Contexto-Devido aos elevados custos e a necessidade de planejamento das operações, a localização ... more Contexto-Devido aos elevados custos e a necessidade de planejamento das operações, a localização de instalaçõesdeve garantir que elassejameficientese acessíveisno horizonte de tempo.Em função da possibilidade de ocorrência de diferentes eventos que podem afetar o desempenho dessas instalações, como, por exemplo, desastres naturais e bloqueio de estradas,incorporar essas probabilidades de ruptura nos modelos de otimização de localização resultamem melhores soluções.Objetivo –Dessa forma, oobjetivodeste estudo foi realizar uma revisão de literaturacom o intuito de selecionar e analisar pesquisas publicadas referentesao temaabordado, examinando o estado atual, as lacunas e as tendências, a fim de direcionar trabalhos futuros. Metodologia -A metodologia utilizada foi dividida em etapas e fases envolvendo:i) Planejamento, onde foi definida a pergunta de pesquisa; ii)Pesquisa, com a definição das palavras-chaves e das basesde dados; iii) Triagem, onde foram selecionados os trabalhos que a...

Este trabalho descreve o desenvolvimento de um sistema de informação focado na gestão de compras ... more Este trabalho descreve o desenvolvimento de um sistema de informação focado na gestão de compras e estoques da Defesa Civil de SP. Esta organização é responsável pela aquisição, armazenagem e distribuição de materiais de assistência humanitária, destinados a municípios paulistas atingidos por desastres. Questões operacionais e gerenciais são cuidadosamente estudadas a fim de subsidiar escolhas fundamentais na concepção do sistema, modelado em linguagem UML. Dados históricos dos sistemas atuais são transcritos para o sistema desenvolvido e é realizada uma mineração de dados. Os conhecimentos extraídos da base de dados são analisados e discutidos com o cliente, mostrando-se capazes de apoiar decisões de planejamento e gestão da organização estudada, além de contribuírem de forma inovadora para a pesquisa em desastres e logística humanitária.

Humanitarian supply chain management mainly involves logistics decisions that must be made before... more Humanitarian supply chain management mainly involves logistics decisions that must be made before, during and after a disaster and is one of the standard challenges that relief agents must address. This study developed a conceptual model of an organizational simulator to analyse logistics decisions and proposed a humanitarian logistics game using this model that allows humanitarian relief managers and students to observe disaster scenarios and to experience in context decision making. Methodologically, bibliographic research served as the basis for developing the conceptual model and for proposing the game. Both the model and the proposed game were applied to two case studies involving relief efforts against hunger to validate their usage. The model's viability and usefulness in training were validated, and its support for decision-making management in humanitarian operations was confirmed.

Transportes, 2017

This study aims to apply GPS (Global Positioning System) data analysis and visualization techniqu... more This study aims to apply GPS (Global Positioning System) data analysis and visualization techniques in order to understand the urban logistics' behavior in some cities of Brazil, through logistical indicators such as distribution of delivery points, volume of distribution of trucks over time (day and time of day), etc. For that, two distinct databases of vehicle tracking were used: the first provided by two large retailers that already had such data for risk management and monitoring of drivers' behavior; and the second one belongs to a map services provider whose data is derived from several companies, mostly vehicle tracking companies. To process this amount of data, it was necessary to use geospatial big data analysis tools. In both databases, it was possible to analyze, for the period 06-10 of October 2014 (Monday to Friday), the volume distribution pattern per day, and the results point to a smaller volume of vehicles circulating on Monday in comparison to other workin...

Background: Technology development in computed tomography has led to more examinations being perf... more Background: Technology development in computed tomography has led to more examinations being performed in diagnostic purposes. The increasing number of examination in CT has also led to more CT machines being bought to the clinics. It is common in a radiological department to have CT machines from different manufactures and with different models, especially in university hospitals. It is a difficulty to create uniformity between scan protocols due the computed tomography are structured differently. Purpose: To evaluate and compare the differences in radiation dose and image quality between the seven CTs´scanprotocols on Radiology department of Sahlgrenska University Hospital, with focus on routine brain. Method: A mixed-method study with experimental research methodology has been performed at Radiology BoIC, Sahlgrenska University Hospital. A head phantom has been examined with all seven CT scanners using the clinical scan protocols. The radiation dose and the image quality have been compared, reviewed and evaluated. Results: GE Revolution gave the lowest CTDIvol and Canon Prime gave the highest CTDIvol. GE Optima 660, GE HD 750 nr 1 and nr 2 gave similar CTDIvol. The image noise were higher from the Siemens scanners compared to the other CT scanners. The soft tissue structure in the phantom were visualized differently at the examinations viewing with thin slices. However, the structures from Canon Prime were more diffuse and less demarcate in comparison to the other examinations. Conclusion: Different computed tomography is built in their unique way. How the image quality presents at the end, are affected by many factors. There are differences in radiation dose and image quality in the seven computed tomography in the clinic. Small differences are also shown in the CT-scanners with the same model. Optimization of scan protocols can be accomplished by scanning phantoms to reduce radiation dose even more, while maintaining diagnostic acceptance.

Desastres naturais e provocados pelo homem tem sido frequentes no mundo, atingindo populacoes res... more Desastres naturais e provocados pelo homem tem sido frequentes no mundo, atingindo populacoes residentes de areas urbanas e rurais e provocando danos de ordem material e imaterial. Em planos emergenciais, a logistica humanitaria e um componnente fundamental para minimizar o sofrimento das vitimas em todas as fases dos desastres. O presente artigo busca identificar as contribuicoes academicas neste tema, atraves de uma revisao da literatura brasileira e de uma comparacao com os resultados os obtidos na revisao da literatura internacional realizada por Peres et al. (2012), com o intuito de identificar os desafios e oportunidades de pesquisas no âmbito de logistica humanitaria, gestao de operacoes em desastres e operacoes de socorro a desastres.

Rio Operations Center (COR) was the agency of Rio de Janeiro Prefecture responsible for monitorin... more Rio Operations Center (COR) was the agency of Rio de Janeiro Prefecture responsible for monitoring the Rio 2016 Olympic and Paralympic Games operations, due to its role in the integrated management of the city operations. This paper presents a case study considering a brief theoretical reference and data collected through direct observations, interviews, internal documents and access to the systems and software used by COR. The analysis of the COR IT infrastructure and monitoring teams’ preparation for the Olympics revealed a successful development of new teams and conflict solving practice. Despite the use of different sources of information and the development of specific systems for the event, the COR preparation faced some restrictions in analytical functions, security and integration among systems. Nevertheless, regionalization for monitoring and interagency coordination, cross-agency instant messaging, and a team for active monitoring of social media emerged as new practices, ...

O presente estudo visa analisar os mecanismos de coordenação das atividades utilizados pelas orga... more O presente estudo visa analisar os mecanismos de coordenação das atividades utilizados pelas organizações na logística em operações humanitárias. Para tanto, as características dos mecanismos de coordenação foram identificadas e simplificadas em um esquema conceitual que representa as interações entre os diversos agentes atuantes (beneficiários, doadores, prestadores de serviço de transportes e armazenagem, fornecedores e agentes humanitários locais e coordenadores), as decisões tomadas pelos agentes em cada cenário de decisão, as etapas logísticas e os indicadores de desempenho da gestão da cadeia de suprimentos. A partir da análise, foi desenvolvido um modelo conceitual de simulador e uma proposição de jogo humanitário de logística, com o intuito de permitir o treinamento para tomada de decisão de gestores humanitários.

Production, 2021

This paper addresses the problem of food insecurity. "More than 820 million people in the world a... more This paper addresses the problem of food insecurity. "More than 820 million people in the world are still hungry today, underscoring the immense challenge of achieving the Zero Hunger target by 2030. Hunger is rising in almost all subregions of Africa" (Food and Agriculture Organization, 2019). In 2015, the UN adopted the 2030 Agenda for Sustainable Development, providing a blueprint for peace and prosperity. At its heart are the 17 Sustainable Development Goals, from which Goal 2 states: "End hunger, achieve food security and improved nutrition and promote sustainable agriculture" (United Nations, 2018).

Production, 2020

Paper aims: Considering that disaster preparedness is essential for a prompt and effective respon... more Paper aims: Considering that disaster preparedness is essential for a prompt and effective response, this paper presents a study to locate disaster relief supplies. Originality: This paper marks the first time a multi-criteria stochastic methodology addresses humanitarian location problems. Research method: We propose a multi methodology approach that employs an optimization model and a multi-criteria decision analysis. Based on logistics costs and penalties assigned for unmet demand, a stochastic model minimizes the total operational cost of opening distribution centers for pre-positioning disaster relief supplies. As decisions in humanitarian operations have multiple criteria and small differences in costs may not be significant by considering other criteria, we perform an analysis of the stochastic model solutions through Multi-criteria Decision Analysis. Main findings: The findings show that the stochastics model leads to good results in uncertainty accommodation and that the consideration of qualitative and quantitative criteria improves decisions in humanitarian operations, especially when the supplies available are not enough to meet all the demand requirements.

Case Studies on Transport Policy, 2021

Abstract In this paper we address an optimization problem that arises in two- or three-echelon di... more Abstract In this paper we address an optimization problem that arises in two- or three-echelon distribution network design whereby there is an interplay between the production and transfer schedule of semi-customizable products and their delivery under tight time windows. It is motivated by a real-world problem of optimizing the joint newspaper last-mile distribution network for SPDL (Sao Paulo Distribution and Logistics), a dedicated logistics provider established by the two major newspaper publishers in Sao Paulo, Brazil. Such collaborative logistics comprises servicing a very large number of customers in the urban setting of a large metropolitan area. The last-mile delivery is performed daily by a fleet comprising several hundreds of motorized vehicles (mainly motorcycles and light vans) that may originate either from a distribution center (that receives and consolidates different newspapers originating at the two printing sites for the delivery routes) or from informal transit points to where they are transferred, forming a multi-echelon delivery system. The resulting problem is complex not only due to its dimension but also as it involves three main types of decisions that should be taken simultaneously: the number and location of the distribution centers (DCs), the optimal synchronization of the transfer schedule of newspapers from the two printing sites to the selected DCs and the newspaper last-mile delivery. The main theoretical contribution of this work is a multi-stage solution approach whose core is a schedule-to-distribution model that allows integrating printing ramp-up constraints with the transfer shipment schedule and distribution routes. Together with a facility location model and a two-tier delivery districting, we could redesign the multi-echelon distribution operation in a more cost-efficient manner while ensuring the current service level to be maintained without service disruptions. This approach allowed us to obtain a new optimized network configuration and the corresponding delivery clusters with vehicle type choice as well as the optimal transfer schedule that yielded a significant cost reduction of nearly 18%.

Sustainability, 2020

Panic buying and hoarding express common human behavior in times of crisis. Early in COVID-19, as... more Panic buying and hoarding express common human behavior in times of crisis. Early in COVID-19, as the pandemic crisis intensified, toilet paper was one of the emblematic cases of panic buying. Using a Geographic Information System (GIS) to cross official per capita income data and real toilet paper transactions obtained from groceries spread around the city of São Paulo (Brazil), this study compares sales levels during the period in which panic purchases took place to the sales levels off that period. As expected, that data disclose noticeable panic buying. Regression analysis reveals that there is a significant positive correlation between average income per capita and panic buying. The results also indicate that panic buying happens in every income class, including low-income ones and contribute to enhancing the understanding of demand behavior during periods of crisis.