33 documents found, page 1 of 4
Using cost of quality to select alternative suppliers and determine incoming in...
Sousa, Sérgio; Telhada, José; Nunes, Eusébio P.Process quality planning should establish the incoming quality inspection plan to achieve the desired quality level with minimum Cost of Quality (CoQ). Additionally, the selection of alternative suppliers must be defined, and, in a dynamic context, the best solution may vary. The purpose of this study is to, through a simulation approach, minimize the total CoQ of two related decisions: i) supplier selection an...
Value measurement in health care delivery process for a paediatric hospital in ...
Antas Aguiar, J.; Telhada, José; Carvalho, Maria Sameiro; Sá, J. C.This project is the result of a volunteer program that took place in the Republic Guinea-Bissau (RGB) at the Paediatric Hospital. The Paediatric Hospital was working with the same technologic skills as Portugal in the 70’s years. There was no wired network between departments, no informatic system and all work was handmade. The physicians received incomplete clinical reports and, sometimes, with gross errors. T...
A hybrid bi-objective optimization approach for joint determination of safety s...
Silva, Pedro M.; Gonçalves, João N. C.; Martins, Tiago M.; Marques, Luís C.; Oliveira, Miguel; Reis, Marcelo I.; Araújo, Luís; Correia, DanielaIn material requirements planning (MRP) systems, safety stock and safety time are two well-known inventory buffering strategies to protect against supply and demand uncertainties. While the role of safety stocks in coping with uncertainty is well studied, safety time has received only scarce attention in the supply chain management literature. Particularly, most previous operations research models have typicall...
An optimization model for bus fleet replacement with budgetary and environmenta...
Emiliano, William Machado; Alvelos, Filipe Pereira e; Telhada, José; Lanzer, Edgar A.As maintenance and operation costs increase with usage over time, equipment is replaced when the value of new equipment is more attractive. Some methods have been developed to solve this problem. In the public transport sector, such problems are frequently analyzed by fleet managers and determined by bus age restriction regulations. We propose an Integer Programming model that integrates both budgetary and envi...
Multiobjective optimization of transit bus fleets with alternative fuel options...
Emiliano, William Machado; Costa, Lino; Carvalho, Maria Sameiro; Telhada, José; Lanzer, EdgarThis paper presents a multiobjective optimization model to find efficient bus fleet combinations taking into account greenhouse gas emissions, conventional air pollutant emissions and costs. The goal is to minimize, simultaneously, three objective functions, Z1 (CO2 emissions), Z2 (Other Types of Emissions), and Z3 (total costs), for a buses fleet of a transit agency. For this case, there were four types of bus...
Economic and risk factors of a transhipment system using electric cargo bikes f...
Ormond, Paulo A. D., Jr.; Ferreira, Paula Varandas; Afonso, Paulo; Telhada, JoséThe distribution of goods in urban areas is a major challenge for managers in the public and private sectors, due to population growth, high density in large urban centers and, in many cases, lack of planning in urban cargo transport systems. In this context, the objective of this paper is to propose a novel collaborative urban cargo distribution system for logistics service providers, based on a transshipment ...
Application of CE principles in design of an integrated participative managemen...
Ormond Jr, Paulo A. D.; Telhada, José; Putnik, Goran D.One of the major obstacles for cities to achieve sustainability is the problems related to urban freight transport. Freight transport operations in urban areas are usually carried out by private companies (freight operators and carriers), using public infrastructure, governed by regulations and implemented and monitored by public authorities. In most cases, because there is no prior consultation with the other ...
Specification of a debureaucratization model in teaching: case study
Pinho, Tiago; Noversa, Cristina; Telhada, José; Barreto, LuísNowadays data is crucial for any organization and its success depends on how it is managed. The management´s information process of the education system in general, and of an education institution, in particular, is a complex and bureaucratic process, where occurs information´s fragmentation. In order to counter this reality, people should be encouraged to simplify procedures by adopting a culture of continuous...
Bus fleet management optimization using the augmented weighted Tchebycheff method
Machado, William; Costa, Lino; Carvalho, Maria Sameiro; Telhada, JoséThis paper presents a multi-objective optimization model for the buses fleet management problem. This model is solved using the Augmented Weighted Tchebycheff method. The aim is to minimize three objective functions, Z1 (CO2 emissions), Z2 (other types of emissions) and Z3 (total costs), for a bus fleet that uses four types of buses: diesel, electric bus, electric bus of fast charging, and Compressed Natural Ga...
Sustainable public transportation from a total cost of ownership perspective
Dahmardeh, Morteza; Fereira, Paula; Afonso, Paulo; Telhada, JoséGreen transportation advocates decreasing use of private motor cars, the increasing use of walking, bicycle and public transport. Since the main factors for people who desire to travel are cost and time, the use of private cars has increased with significant negative impacts on environment. Total Cost of Ownership (TCO) is an analysis meant to uncover all the lifetime costs that follow from owning certain kinds...