Voici les éléments 1 - 10 sur 31
  • Publication
    Accès libre
    Tool Wear Monitoring Using Multi-sensor Time Series and Machine Learning
    (2023-12-15)
    Jonathan Dreyer
    ;
    Stefano Carrino
    ;
    Hatem Ghorbel
    ;
    In the milling process of micro-machining, the optimization process is one of the keys to reduce production cost. By monitoring the tool wear and detecting when it is no longer acceptable, the machining process can be adjusted more accurately. This research explores four approaches using different machine learning models to predict machining tool wear during the milling process. The study is based on a dataset created with a face milling operation on stainless steel (AISI 303) round material. The machining is divided into a number of stairs and is performed with a 3mm tungsten carbide. Three different types of sensors are used to measure the wearing process, with acoustic emission, accelerometers and axis currents. The better approach achieved a f1-score of 73% on five classes with a Extra Trees Classifier.
  • Publication
    Accès libre
    Assessment of the Efficiency of Public Hospitals in Romania
    (2023-09-14)
    Laura Asandului
    ;
    Raluca-Elena Caunic
    ;
    Considering the high pressure on the healthcare limited resources, mainly on hospitals, determined by the population ageing, and the increased incidence of chronic and infectious diseases, it is essential to both decrease expenditures and provide good quality healthcare. In this paper we focus on the efficiency of Romanian public hospitals. Our research goals are to identify and examine the inefficient public hospitals in Romania; to determine sources of inefficiency in Romanian public hospitals; to describe a potential reduction in all inputs on average to rationalize hospital resources; and recommend that hospital management be improved. We propose an approach that contains preliminary data analyses to obtain homogeneous distributions, then we use Data Envelopment Analysis to estimate the technical efficiency scores for the hospitals in the sample. The results showed that more than half of the examined small hospitals were technically inefficient and that they could have produced a larger number of discharges and consequently an increased number of inpatient days. Possible reductions in inputs were also indicated. These results suggest ways of improving hospital management and restructuring and reorganizing decisions that can be implemented in the hospital network.
  • Publication
    Accès libre
    Swiss Health Metadata Repository: prototype evaluation
    (Université de Neuchâtel Institut du management de l'information, 2021-6-30) ; ;
  • Publication
    Accès libre
    Swiss health metadata repository : implementation recommendations - requirements, recommended architecture and prototype implementation
    (Université de Neuchâtel Institut du management de l'information, 2021-6-1) ; ; ;
    In the context of a decentralized approach for health data resources, a central metadata repository becomes essential for the identification/description of the necessary resources. A Swiss Health Metadata Repository is expected to enable multiple advantages, namely: to provide a single entry point for searching/retrieving health-related resources; to help identify possible semantic linking between data sources; to provide a consistent data catalog ensured by the use of standardized vocabularies/ontologies; to enable potential exchange of experience and know-how between health data-related projects in Switzerland; and to increase the capacity of research groups to share/access/analyse health related data. This policy brief focuses on the implementation aspects of a proof-of-concept proto-type for Swiss Health Metadata Repository.
  • Publication
    Accès libre
    Design principles of a central metadata repository as a key element of an integrated health information system
    (Université de Neuchâtel Institut du management de l'information, 2020-1-31) ; ; ;
    The Swiss Health System is a complex system with different groups of actors for which data is collected and analyzed using various methods, leading to a large heterogeneity and dispersion of available data. The specificities of a Swiss Health System favor a hybrid infrastructure to manage the heterogeneity and dispersion of Swiss health-related data. This policy brief shows the importance of a metadata management infrastructure to identify and describe health data resources and highlights several essential key elements for the design of a metadata repository and also raises important practical questions.
  • Publication
    Accès libre
    The CriLiM Methodology: Crime Linkage with a Fuzzy MCDM Approach
    (: IEEE, 2013-8-12) ; ;
    Grossrieder, Lionel
    ;
    Ribaux, Olivier
    ;
    Grouping events having similarities has always been interesting for analysts. Actually, when a label is put on top of a set of events to denote they share common properties, the automation and the capability to conduct reasoning with this set drastically increase. This is particularly true when considering criminal events for crime analysts; conjunction, interpretation and explanation can be key success factors to apprehend criminals. In this paper, we present the CriLiM methodology for investigating both serious and high-volume crime. Our artifact consists in implementing a tailored computerized crime linkage system, based on a fuzzy MCDM approach in order to combine spatio-temporal, behavioral, and forensic information. As a proof of concept, series in burglaries are examined from real data and compared to expert results.