Search results for "Operations"
showing 10 items of 1692 documents
Hierarchical Syntactic Models for Human Activity Recognition through Mobility Traces
2019
AbstractRecognizing users’ daily life activities without disrupting their lifestyle is a key functionality to enable a broad variety of advanced services for a Smart City, from energy-efficient management of urban spaces to mobility optimization. In this paper, we propose a novel method for human activity recognition from a collection of outdoor mobility traces acquired through wearable devices. Our method exploits the regularities naturally present in human mobility patterns to construct syntactic models in the form of finite state automata, thanks to an approach known asgrammatical inference. We also introduce a measure ofsimilaritythat accounts for the intrinsic hierarchical nature of su…
Quality control in the optical industry: From a work analysis of lens inspection to a training programme, an experimental case study
2007
A cognitive work analysis of quality inspection in the optical industry has been carried out in order to devise a training programme. The task concerned the inspection of high quality human eyeglass lenses. We conducted an experimental investigation of defect detection and acceptability decision-making tasks in 18 experts and novice inspectors. Detection and decision-making were investigated together and separately in two experimental sessions. We showed the effect of expertise on reaction times and errors, and we described the cognitive processes of novice inspectors. On the basis of the processing differences between the two groups, a training programme for new inspectors was devised and …
Continuous improvement of the quality management system within an automotion company in Romania
2021
Abstract In this article, the authors present a case study on the methodology used in the process of continuous improvement of the performance of the quality management system, carried out in a company belonging to the field of production of devices and automation systems. To start this process, the internal audit subsystem and the analysis process performed by the management were first streamlined. In order to improve the non-compliant processes, within the quality management system an improvement strategy was established based on the stages of the 6 sigma methodology, namely the DMAIC model. Following the application of the methodology proposed by the authors, improvements of the processe…
BUILDING THE POM CURRICULUM FOR A PRIVATIZING ECONOMY: AN EVALUATION FROM MANUFACTURERS‘ PERSPECTIVES
2009
Manufacturing in Eastern European countries is in transition to open-market competition. One transitional issue is university education for operations managers from the perspective of business practitioners. Survey responses by 203 manufacturing professionals from 83 companies provide recommendations for operations management education at the University of Sibiu in Romania. The recommendations substantially reorient curricula that traditionally prepared students for professions in centrally controlled economies rather than for open-market competition. The redesigned curriculum has an educational advantage in its integration of production, marketing, and engineering, all under one college of…
Contributions Regarding the Reduction of Production Costs for Brewing by Recovering and Reusing the Carbon Dioxide
2014
Abstract Nowadays in every field the main aim is to produce corresponding quality products at competitive prices for buyers. In addition to the multiple possibilities to reduce the brewing production cost, one of the most significant ways is to reduce the production cost by recovering the carbon dioxide (CO2) resulting from the fermentation of beer, taking into account the fact that the CO2 thus resulting is completely natural. This scientific paper presents a certain strategy based on costs, strategy which relies on the experience of the authors, on the economic impact of CO2 recovery resulting from the fermentation of beer and which reflects itself in the production cost and implicitly in…
Improving the management of potentially predictable hospital readmissions of the elderly and their quality of life through new icts
2013
3rd International Conference on the Elderly and New Technologies. III Jornadas Internacionales de Mayores y Nuevas Tecnologías. The ageing population is currently beginning to create economic repercussions, as ageing often implies an increase of health expenditure related to, specially, hospital admissions and/or unplanned readmissions and long term care services. The present paper deals with two strategies that could be implemented through the establishment and use of new technologies to avoid these increasing costs: 1) screening tools of health information systems aimed at identifying patients at risk of hospital readmissions or repeated use of health resources; and 2) new icts at elderly…
Entanglement replication in driven-dissipative many body systems
2012
We study the dissipative dynamics of two independent arrays of many-body systems, locally driven by a common entangled field. We show that in the steady state the entanglement of the driving field is reproduced in an arbitrarily large series of inter-array entangled pairs over all distances. Local nonclassical driving thus realizes a scale-free entanglement replication and long-distance entanglement distribution mechanism that has immediate bearing on the implementation of quantum communication networks.
Statistical performance of a multiclass bulk production queueing system
2004
Abstract In this paper, we discuss how to statistically analyze a make-to-stock production system the behaviour of which depends on a multiclass bulk queueing system. The performance of the system is evaluated in terms of the different demands of products, processing times and, mainly, through the finished product inventory and other related measures that quantify the queueing effects in the system. A numerical example which illustrates the applicability of the results in an inventory scenario is also discussed.
Une stratégie de test de la racine unitaire
1991
This paper compares three approaches of the unit root testing strategy issue : i.e. the DICKEY, BELL and MILLER (1986) approach, elaborated for prevision purposes, which advocates the estimation of a model without trend at the outset, in opposition to the PERRON (1988) and HENIN and JOBERT (1990) testing strategies. The latter is undoubtedly operational in empirical works but it doesn’t encompass joint tests explicitly. We then suggest an unifiedgeneral framework embracing the last two appoaches and giving a practical scheme which is as complete and operational as possible. The behaviour of these strategies is assesed in an empirical study of the seasonaly adjusted real GDP in France and an…
Evaluation of routing policies using an interval-valued TOPSIS approach for the allocation rules
2021
Abstract The success of warehouse management in a supply chain widely depends on an efficient and effective retrieve of customer orders, which is known as the picking process. This paper investigates various routing policies of pickers under two different allocation methods of items in a warehouse of fixed layout, and evaluates their performance in terms of the resulting travel distance by means of a simulation approach. The allocation strategies taken into account are the random storage and a multi-criteria approach, called Interval-Value TOPSIS (IV-T), which is expressively proposed in this paper as a new way to solve the storage allocation problem of items in a warehouse. Because of the …