1,721,002 research outputs found
Historical data repositories in software engineering: Status and possible improvements
No full textHistorical datasets, or Historical Data Repositories (HDR) are important in software engineering, because they support a variety of useful analyses for benchmarking as well as estimation process purposes. Besides private repositories, some public domain data repositories - such as the PROMISE and the ISBSG datasets - have been available for over 15 years. Regardless of their importance, such repositories evolved more in amount of data points, than quality or conformity to commonly agreed practices for data collection and verification. This paper provides some considerations about current issues and possible improvements of (public) HDR's
A stepped approach to support preassembly tasks assignment in bus production
No full textThis paper proposes a structured approach to assign operations related to material and subassembly preparation before line assembly, to a group of multiskilled operators. It first characterizes the preparation tasks and their compatibility with the skill level of operators. Then, it formulates and solves the corresponding assignment problem. In case of infeasibility or not optimal solutions, the approach permits also to identify appropriate training measures in order to minimize the number of involved operators or maximize the number of assigned preparation tasks. This approach is the outcome of an action research case study which dealt with a bus assembly line. The results showed that the approach was relatively easy to implement and effectively led some crucial decisions which were mostly experience-based and not made in a structured manner
Studio di Configurazione e Avviamento di una Nuova Linea Monoprodotto in Ambiente Quality Oriented
No full textConsidering greenhouse gas emissions in a single vendormultiple buyer coordinated supply chain
No full textMaintenance management and organization
No full textMaintenance management is a relatively new field and the corresponding body of knowledge is continuing to grow (Visser, 2002). For example, in Europe, two technical committees of the Comité Européen de Normalisation (CEN) are currently adding to the body of knowledge terminologies, guidance to prepare agreements, control systems for maintenance management, and other development directions (CEN, 2008). In particular, CEN Technical Committee 319 deals specifically with maintenance. They have published one standard (EN 15341) that provides maintenance management with the support of a control system (made up from more than 70 indicators) to achieve maintenance excellence and to competitively use technical assets, regardless of industry. Moreover, this committee has been addressing the issues of defining a maintenance management general framework (including buildings) through a standard currently in progress and identifying three very promising development directions (i.e., responsibilities in maintenance; identification, classification, and costs in maintenance actions; and maintenance in the healthcare industry). © 2009 Springer London
A simulation approach in process mining conformance analysis. the introduction of a brand new BPMN element
No full textThe computerization of organizational processes provides several tools for evaluating the quality of mapping. An executed process produces, in each instance, log files that can be used to reconstruct the actual procedure carried out by the system as well as to highlight deviations or "move" from the mapped path. These "moves" represent a loss that we consider unacceptable for organizations, which manifests its effects in various modes and weights. From this arises, in our view, the need for tools and logic approach to manage and limit the "conformance risk", including as well as a proper consideration and methodological evaluation of the same risk, but also practical solutions and mapping tools that might influence the occurrence. In this paper we propose a methodology and a simulation model of "Conformance Risk Aware Desing" in order to support the modeler in moving from a diagnostic to a preventive and design view of the conformance's matter. Purpose In this paper we have analyzed the Process Mining theme and give a new interpretation of the "conformance analysis" treating this issue not as an inevitable diagnostic phenomenon but as a real and necessary design parameter. This turning point is realized increasing the process mapping's quality through two main purposes. Our first purpose is the introduction of a brand new modeling elements in the world famous BPMN Modelling Notation with the implicit and objective meaning of "conformance controller" that indicates the need for the agent to communicate about the execution of the preceding task. The second part of the purpose pass through the systematic inclusion of a "conformance controller" pattern after each task whose deviation's risk assessment exceeds a certain threshold value. This methodological approach led to a stronger process design as for the task considered critical by the organization and to a lower need of process model repairing efforts and costs once that the process is released and log files are available. Design/methodology/approach In order to demonstrate the usefulness and value of our proposal we got served of a simulation based on the System Dynamic logic. We've modeled a human resource's behavior facing a number of task to perform under the influence and the documentation of a process model including both the "conformance controller" and the controller pattern. We used a combination of software including Matlab and Powersim Studio in order to getting results about a numeric estimation of the strength of the mapped task, basing our argument on the fuzzy logic rules and techniques, as for Matlab, and simulating hundred runs of a generic process in different operational scenarios, as for Powersim Studio. Collecting all the simulated data, we produced a series of statistical considerations about the effectiveness of the proposal and about the scenarios that increased its economical efficiency. Originality/value We open the discussion concerning the need by the organizations, increasingly constrained by regulatory guidelines and outside interests, of managing and preventing the risk of deviation from the process model especially regarding the critical and most added valued tasks, proposing a specific methodology. We also propose the integration of the BPMN Modelling Notation with a new implicit element and pattern to be used for the aim above. Another important aspect of the proposal is the building of a provisional model able to predict the impact of deviation from the mapped process using the defuzzyfication and implementable by every kind of organization that owns datasets about its processes
A periodic review policy for a coordinated single vendor-multiple buyers supply chain with controllable lead time and distribution-free approach
No full textIn this paper, we study a single vendor-multiple buyer integrated inventory model with controllable lead time and backorders-lost sales mixture. Each buyer adopts a periodic review policy in which the review period is an integer fraction of the production cycle time of the vendor. To reflect the practical circumstance characterized by the lack of complete information about the demand distribution, we assume that only the first two moments of the demand during the protection interval are known. The long-run expected total cost per time unit is derived, which includes stockout costs. The problem is to determine the length of the inventory cycle of the vendor, the produce-up-to level for the vendor, the replenishment policy of each buyer, and the length of lead times that minimize the cost function under the minimax distribution-free approach. Two alternative heuristics are proposed. Numerical experiments have been carried out to investigate the performance of the heuristics and to study the sensitivity of the model
Stochastic joint replenishment problem under a fill rate constraint with controllable lead times and shared cost allocation
No full textIn a family of items under coordinated inventory replenishments, some products may be replenished at the same time, which in turn implies that some lead time components and costs may be shared among them. This paper investigates this aspect in the context of the joint replenishment problem under the class of cyclic policies, assuming random demands and controllable lead times, and imposing a fill rate constraint for each item.& COPY; 2023 Elsevier B.V. All rights reserved
A New Hybrid Dynamic FMECA with Decision-Making Methodology: A Case Study in An Agri-Food Company
No full textThe Failure Mode and Effect Analysis (FMEA) is often used to improve a system’s reliability. This paper proposes a new approach that aims to overcome the most critical defects of the traditional FMEA. This new methodology combines the Entropy and Best Worst Method (BWM) methodology with the EDAS and System Dynamics, FMECA: The EN-B-ED Dynamic FMECA. The main innovation point of the proposed work is the presence of an unknown factor (Cost) that allows to obtain an objective weighted factor, a risk index when a machine failure occurs. The criticality analysis has been carried out using software (Vensim PLE x64) to simulate System Dynamics models to identify corrective actions and evaluate the possible implementation of these actions. The methodology proposed is applied to a case study in a relevant Italian company in the agri-food sector
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