Repositório Colecção: Textos Completos em Actas de Encontros Científicos Internacionais com ArbitragemTextos Completos em Actas de Encontros Científicos Internacionais com Arbitragemhttps://hdl.handle.net/1822/50352024-03-28T15:50:09Z2024-03-28T15:50:09ZImpact of order Size on quality Cost of 100% Inspection: A simulation approachNunes, Eusébio P.Sousa, SérgioDias, Luis S.https://hdl.handle.net/1822/900512024-03-26T11:56:02ZTítulo: Impact of order Size on quality Cost of 100% Inspection: A simulation approach
Autor: Nunes, Eusébio P.; Sousa, Sérgio; Dias, Luis S.
Resumo: In manufacturing companies, Cost of Quality (COQ) is in!uenced by inspection strategies. "e determination of CoQ, may
involve in complex analitycal models. "e paper’s objective is to
assess, through a simulation approach, the impact of order size
in CoQ per unit when adopting 100% inspection, considering
inspection errors and that some defects are repairable. "e proposed approach is developed in SIMIO to determine quality
costs, and the number of compliant units delivered. Results
show that, in four scenarios representing di#erent lot sizes, the
average CoQ per unit and the proportion of delivered units is
similar, but the variability of these indicators increases with the
reduction of order size. "us, the de$nition of small order sizes
increases the risk for production managers in meeting targets.
<b>Tipo</b>: conferencePaperImplementation of a quality cost management model: case study from the textile industry sectorBarros, BrunoRodrigues, Cristina Maria SantosSousa, SérgioNunes, Eusébio P.https://hdl.handle.net/1822/900092024-03-27T21:08:40ZTítulo: Implementation of a quality cost management model: case study from the textile industry sector
Autor: Barros, Bruno; Rodrigues, Cristina Maria Santos; Sousa, Sérgio; Nunes, Eusébio P.
Resumo: The goal associated with quality costs management, is to reduce them, because they can make up a significant proportion of a company’s overall expenses, but the majority of Portuguese companies from the textile industry sector do not use quality cost management systems. Additionally, there is a scarcity of sectorial case studies on this topic. Thus, a research gap seems to exist demanding more case studies on the application of quality cost models on specific contexts. The main objective of this work is show how to implement the Prevention-Appraisal-Failure (PAF) Model in a dyeing and knitting finishing company. The implementation established an appropriate categorization for each quality cost element, data were collected and analysed. The total quality costs represent 12% of sales turnover, distributed unevenly by four categories: 23% of prevention costs; 26% of appraisal costs, 46% of internal failures costs, and 5% of external failures costs. Top managers considered this value higher than initially anticipated and promoted the deployment of improvement projects. This work can provide guidelines for companies in the same sector to adopt such quantification as a means of justifying new improvement projects and reduce costs.
<b>Tipo</b>: conferencePaperUsing cost of quality to select alternative suppliers and determine incoming inspection in dynamic contextsSousa, SérgioTelhada, JoséNunes, Eusébio P.https://hdl.handle.net/1822/900082024-03-26T07:50:36Z2024-03-26T00:27:51ZTítulo: Using cost of quality to select alternative suppliers and determine incoming inspection in dynamic contexts
Autor: Sousa, Sérgio; Telhada, José; Nunes, Eusébio P.
Resumo: 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 and ii) incoming quality inspection selection. We will
determine the CoQ of alternative suppliers and determine the CoQ of alternative incoming
inspections that are associated with such decisions. The inputs to the model are components
costs, inspection costs, proportion of defectives from incoming lots, Type I and Type II
inspection errors, alternative control methods, and the cost of delivering defective
components to the manufacturing system. The uncertainty of some inputs is modelled through
probability distributions and the dynamic context is modelled through different scenarios. The
results from simulations estimate the total CoQ of each alternative decision. This model allows
to determine the CoQ of the alternative scenarios and to define a best supplier and incoming
quality inspection plan. A numerical example based on a manufacturing process demonstrates
the applicability of this model and the results indicate that the optimal solution may vary
when the model parameters are updated.
<b>Tipo</b>: conferencePaper2024-03-26T00:27:51ZQuality control in remanufacturing: Distinguishing features and techniquesSousa, SérgioPham, Duc T.https://hdl.handle.net/1822/899982024-03-25T20:42:45ZTítulo: Quality control in remanufacturing: Distinguishing features and techniques
Autor: Sousa, Sérgio; Pham, Duc T.
Resumo: Considering the existing amount of work on quality control in manufacturing companies, this work analyses its applicability to remanufacturing systems. After reviewing different quality control methods, we describe the distinguishing features of remanufacturing compared to manufacturing systems, such
as increased variability of key remanufacturing inputs; the definition of customer
requirements was done by a third party; customer requirements may be obsolete;
and key product/process characteristics may need to be updated. Then, we conclude that existing quality planning and control techniques can be transferred to
the remanufacturing domain. It ends by suggesting ways to assess the resulting
quality control based on quality costs and identifies future research directions.
<b>Tipo</b>: conferencePaperQuality cost of 100% inspection on manufacturing processes: Advantages of using a simulation approachDias, Luis S.Nunes, Eusébio P.Sousa, Sérgiohttps://hdl.handle.net/1822/899932024-03-25T20:49:26ZTítulo: Quality cost of 100% inspection on manufacturing processes: Advantages of using a simulation approach
Autor: Dias, Luis S.; Nunes, Eusébio P.; Sousa, Sérgio
Resumo: In manufacturing companies, quality costs
can be quantified and reduced. Nevertheless, there are
obstacles to their determination, restricting the ability of
organisations to establish quality cost reduction programmes
to become more competitive. The paper's objective is to
propose a simulation approach to determine the quality cost
of 100% inspection strategy. The proposed approach is
developed in SIMIO and presents advantages over analytical
solutions, such as the lower modelling effort and broader
statistics than the expected quality cost. Results suggest that
the graphic animation of the simulation model developed
allows assessing the coherence of the model and adjusted to
reality, thus contributing to greater acceptance of the model
and consequent involvement of managers, contributing to a
better estimation of quality costs.
<b>Tipo</b>: conferencePaper