The Experts below are selected from a list of 111 Experts worldwide ranked by ideXlab platform

Giuseppe Pozzi - One of the best experts on this subject based on the ideXlab platform.

  • temporal conceptual modelling of workflows
    International Conference on Conceptual Modeling, 2003
    Co-Authors: Carlo Combi, Giuseppe Pozzi
    Abstract:

    Business Processes require the coordinated execution of simple activities (tasks) by human or automatic executors (agents). Business Processes are described in terms of a workflow and their execution is supported by suitable software systems named workflow management systems (WfMS). Several conceptual models for the formal definition of workflows have been defined in the literature. However, a detailed conceptual model enabling the Process Designer to specify temporal constraints for the activities in a workflow is still lacking.

  • temporal conceptual modelling of workflows
    Lecture Notes in Computer Science, 2003
    Co-Authors: Carlo Combi, Giuseppe Pozzi
    Abstract:

    Business Processes require the coordinated execution of simple activities (tasks) by human or automatic executors (agents). Business Processes are described in terms of a workflow and their execution is supported by suitable software systems named workflow management systems (WfMS). Several conceptual models for the formal definition of workflows have been defined in the literature. However, a detailed conceptual model enabling the Process Designer to specify temporal constraints for the activities in a workflow is still lacking. By this paper we enrich a previously published conceptual model of workflows by adding the definition of three kinds of constraints: task constraints, related to the starting timestamp and to the duration of one single task; schedule-task constraints, related to the time elapsed between the completion of a task and the start of the subsequent task by the entitled agent; inter-task constraints, related to the time elapsed between the execution of a task and of one subsequent task of its. The enriched model enables a WfMS to manage soft real-time Processes.

Carlo Combi - One of the best experts on this subject based on the ideXlab platform.

  • temporal conceptual modelling of workflows
    International Conference on Conceptual Modeling, 2003
    Co-Authors: Carlo Combi, Giuseppe Pozzi
    Abstract:

    Business Processes require the coordinated execution of simple activities (tasks) by human or automatic executors (agents). Business Processes are described in terms of a workflow and their execution is supported by suitable software systems named workflow management systems (WfMS). Several conceptual models for the formal definition of workflows have been defined in the literature. However, a detailed conceptual model enabling the Process Designer to specify temporal constraints for the activities in a workflow is still lacking.

  • temporal conceptual modelling of workflows
    Lecture Notes in Computer Science, 2003
    Co-Authors: Carlo Combi, Giuseppe Pozzi
    Abstract:

    Business Processes require the coordinated execution of simple activities (tasks) by human or automatic executors (agents). Business Processes are described in terms of a workflow and their execution is supported by suitable software systems named workflow management systems (WfMS). Several conceptual models for the formal definition of workflows have been defined in the literature. However, a detailed conceptual model enabling the Process Designer to specify temporal constraints for the activities in a workflow is still lacking. By this paper we enrich a previously published conceptual model of workflows by adding the definition of three kinds of constraints: task constraints, related to the starting timestamp and to the duration of one single task; schedule-task constraints, related to the time elapsed between the completion of a task and the start of the subsequent task by the entitled agent; inter-task constraints, related to the time elapsed between the execution of a task and of one subsequent task of its. The enriched model enables a WfMS to manage soft real-time Processes.

Minsoo Kim - One of the best experts on this subject based on the ideXlab platform.

  • a study on the development of a Process Designer for logistics Process modeling
    International Conference on Innovative Computing Information and Control, 2007
    Co-Authors: Dongsoo Kim, Minsoo Kim
    Abstract:

    For the efficient execution and effective management of business Processes, the importance of BPM (business Process management) system has been emphasized incrementally over several years. Many companies have been implemented BPM systems and positive reports on their successful deployments have been released. Most of the BPM implementations, however, are focused on the document-oriented Process execution environment, which were the major concerns of the conventional workflow management systems. Thus, the Process execution still stays on the semi-automatic level that demands lots of manual involvements of users. However, there are some application domains that have few interactions with users but have massive Processing volume. In such domains, the Process is executed more automatically and modeling of the Process is greatly domain-specific. With current BPM systems that mostly target general- purpose business Processes, it is hard to successfully meet those domain-specific requirements. Logistics is one of such BPM application domain that requires real-time Process tracking for the efficient utilization of the facilities and automatic control of logistics flow. In this paper, we address the design and development of BPM system for logistics application domain. With our L-BPM system that is implemented over the LIT RFID middleware system, we could test the feasibility of logistics specific business Process management system.

Sven Haglund - One of the best experts on this subject based on the ideXlab platform.

  • the effects of blank geometry on gear rolling for large gear modules experiments and finite element simulations
    IEEE Access, 2018
    Co-Authors: Alireza Khodaee, Arne Melander, Sven Haglund
    Abstract:

    Gear rolling is a forming Process to produce gear wheels by plastic deformation. The advantage of the Process is to eliminate the chip formation during production and also to improve the product properties since the non-metallic inclusions will be oriented along the cog surface and not perpendicular to it. The method has been developed in the past years for gear production for automobile application with modules up to 3 mm. The successful application of gear rolling in those cases raises the question regarding the feasibility of using cold rolling to manufacture gears with larger modules which can be used for heavy vehicles. In this paper, a gear wheel with normal module of 4 mm has been studied in order to investigate if such large modules can be manufactured by gear rolling. One of the issues in rolling of gears is the design of the blank geometry in order to obtain the right gear geometry after the rolling Process. Blank shape modifications are necessary to control and to reduce the undesired shape deviations caused by the large plastic deformations in rolling. The blank modifications also help the Process Designer to control the forming force and torque. In this paper, the Process has been modeled by finite element simulation and the influence of different blanks has been simulated. The validity of the FE model has been checked through several experiments. Both the numerical and experimental results revealed favorable blank modifications to apply for further developments of the gear rolling Process.

Ianca Maria Colosimo - One of the best experts on this subject based on the ideXlab platform.

  • logistic regression analysis for experimental determination of forming limit diagrams
    International Journal of Machine Tools & Manufacture, 2006
    Co-Authors: Matteo Strano, Ianca Maria Colosimo
    Abstract:

    Abstract The forming limit diagram (FLD) is probably the most common representation of sheet metal formability and can be defined as the locus of the principal planar strains where failure is most likely to occur. Experimental determination of the FLD consists in performing a set of formability tests on a sheet metal blank, where a regular grid has been previously etched. After each test, the deformation of the grid is measured and the relative strains computed. Strains observed closely at the fracture location are related to as ‘failed’ points, while strains observed on the sound areas of the specimens are labelled as ‘safe’ points. Starting from a set of experimental tests, the FLD should be empirically determined through a statistical analysis of collected data. In fact, statistical approaches (such as linear regression) are required to properly account for the internal randomness of failure occurrence. Linear regression, as well as most of the other empirical approaches in the scientific literature, takes into account only information related to the safe points. This paper proposes a different approach, the logistic regression, for the empirical determination of FLDs. Logistic regression allows to directly derive the probability of an event (e.g. the failure) as a function of different predictor variables (both the principal planar strains). Therefore, by using logistic regression, the Process Designer can directly associate the failure probability to the scrapping costs, in order to economically evaluate a new sheet metal forming operation. Logistic regression allows the determination of the FLD by including information concerning both safe and failed points.