9,391 research outputs found
Communicating Processes with Data for Supervisory Coordination
We employ supervisory controllers to safely coordinate high-level
discrete(-event) behavior of distributed components of complex systems.
Supervisory controllers observe discrete-event system behavior, make a decision
on allowed activities, and communicate the control signals to the involved
parties. Models of the supervisory controllers can be automatically synthesized
based on formal models of the system components and a formalization of the safe
coordination (control) requirements. Based on the obtained models, code
generation can be used to implement the supervisory controllers in software, on
a PLC, or an embedded (micro)processor. In this article, we develop a process
theory with data that supports a model-based systems engineering framework for
supervisory coordination. We employ communication to distinguish between the
different flows of information, i.e., observation and supervision, whereas we
employ data to specify the coordination requirements more compactly, and to
increase the expressivity of the framework. To illustrate the framework, we
remodel an industrial case study involving coordination of maintenance
procedures of a printing process of a high-tech Oce printer.Comment: In Proceedings FOCLASA 2012, arXiv:1208.432
Equilibrium transition study for a hybrid MAV
Wind tunnel testing was performed on a VTOL aircraft in order to characterize longitudinal flight behavior during an equilibrium transition between vertical and horizontal flight modes. Trim values for airspeed, pitch, motor speed and elevator position were determined. Data was collected by independently varying the trim parameters, and stability and control derivatives were identified as functions of the trim pitch angle. A linear fractional representation model was then proposed, along with several methods to improve longitudinal control of the aircraft
Self-Evaluation Applied Mathematics 2003-2008 University of Twente
This report contains the self-study for the research assessment of the Department of Applied Mathematics (AM) of the Faculty of Electrical Engineering, Mathematics and Computer Science (EEMCS) at the University of Twente (UT). The report provides the information for the Research Assessment Committee for Applied Mathematics, dealing with mathematical sciences at the three universities of technology in the Netherlands. It describes the state of affairs pertaining to the period 1 January 2003 to 31 December 2008
Involving External Stakeholders in Project Courses
Problem: The involvement of external stakeholders in capstone projects and
project courses is desirable due to its potential positive effects on the
students. Capstone projects particularly profit from the inclusion of an
industrial partner to make the project relevant and help students acquire
professional skills. In addition, an increasing push towards education that is
aligned with industry and incorporates industrial partners can be observed.
However, the involvement of external stakeholders in teaching moments can
create friction and could, in the worst case, lead to frustration of all
involved parties. Contribution: We developed a model that allows analysing the
involvement of external stakeholders in university courses both in a
retrospective fashion, to gain insights from past course instances, and in a
constructive fashion, to plan the involvement of external stakeholders. Key
Concepts: The conceptual model and the accompanying guideline guide the
teachers in their analysis of stakeholder involvement. The model is comprised
of several activities (define, execute, and evaluate the collaboration). The
guideline provides questions that the teachers should answer for each of these
activities. In the constructive use, the model allows teachers to define an
action plan based on an analysis of potential stakeholders and the pedagogical
objectives. In the retrospective use, the model allows teachers to identify
issues that appeared during the project and their underlying causes. Drawing
from ideas of the reflective practitioner, the model contains an emphasis on
reflection and interpretation of the observations made by the teacher and other
groups involved in the courses. Key Lessons: Applying the model retrospectively
to a total of eight courses shows that it is possible to reveal hitherto
implicit risks and assumptions and to gain a better insight into the
interaction...Comment: Abstract shortened since arxiv.org limits length of abstracts. See
paper/pdf for full abstract. Paper is forthcoming, accepted August 2017.
Arxiv version 2 corrects misspelled author nam
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