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Learning computer architecture concepts through interactive model buildingLees, Brian January 1987 (has links)
No description available.
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Análise da colaboração em situação de formação de professores de matemática onlineFILHO, Roberto Mariano de Araujo 24 February 2015 (has links)
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Previous issue date: 2015-02-24 / CAPES / Esta pesquisa tem por objetivo analisar a aprendizagem colaborativa suportada por
computador no contexto da formação do professor de matemática quanto ao uso de
modelagem para o ensino e aprendizagem de funções. A pesquisa fundamenta-se
na Aprendizagem Colaborativa com Suporte Computacional (CSCL), Caracterização
das Funções e Modelagem Matemática. A metodologia de investigação conta com
as fases de elaboração do ambiente virtual CSCL para propiciar: discussão das
dificuldades de aprendizagem das funções, discussão e elaboração de simuladores
utilizando o software Modellus, exploração da modelagem como metodologia de
ensino e aprendizagem, de forma colaborativa. A situação foi estruturada tendo
como momento inicial uma instrumentalização dos softwares que suportam a
comunicação e interação, além do software de modelagem que permite a exploração
de situações envolvendo as funções afim e quadrática, em sintonia com as
discussões das teorias da CSCL. O estudo analisa o trabalho colaborativo
desenvolvido por 3 grupos de licenciandos em Matemática. Os dados revelam que o
grupo menor conseguiu colaborar com mais facilidade que os grupos maiores. Os
dados mostram também que as discussões acerca das dificuldades dos estudantes
foi onde houve maior colaboração. Além disso, o script elaborado não conseguiu
direcionar os participantes sozinhos durante a atividade, precisando sempre de uma
intervenção do mediador. Também foram percebidos entraves do ambiente que
mostraram a necessidade da montagem de outro espaço, que pudesse oferecer
recursos que facilitem a comunicação entre os participantes da sessão. / This research aims to analyze collaborative learning supported by computer in the
mathematics teachers trainning course in the use of modeling for teaching and
learning functions. The research framework is based on Collaborative Learning with
Computer Support (CSCL), Characterization of Functions and Mathematical
Modeling. The research methodology includes the design of a colaborative learning
environment, preparation of CSCL virtual environment to provide: discussion of the
difficulties of learning functions, discussion and development of simulators using
Modellus software, exploitation of modeling as a teaching and learning methodology,
collaboratively. The situation was structured taking as a starting point the
instrumentalization of software programmes, the one which supports communication
and interaction and Modellus, the modeling software which allows the exploration of
situations involving quadratic and affine functions, considering the discussions of
CSCL theory. The study analyzes the collaborative work of three undergraduates
groups of students. The data shows that the smaller group collaborated more easily
than larger groups. The data also show that discussions about the difficulties of the
students was where there was greater collaboration. In addition, the script written
could not direct participants themselves during the activity, always in need of a
mediator intervention. Also some environmental barriers were showed the need to
rethink the virtual space, which could provide resources to facilitate communication
between participants in the session.
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Energieeffizienz in WorkflowsystemenPüschel, Georg 28 March 2011 (has links)
Im CoolSoftware-Projekt wurden Metamodelle, Algorithmen und Architekturmuster für energieeffiziente Software entworfen. Sobald ein komplexer Kontrollfluss auf einem solchen System ausgeführt werden soll, muss das dynamische Energieverhalten in die Optimierung einbezogen werden. Um diese Herausforderung zu lösen, werden in dieser Arbeit die Ansätze von CoolSoftware durch weitere Modellelemente und Algorithmen ergänzt. Unter anderem kommt eine Simulation zum Einsatz, um funktionell mögliche Konfigurationen zu bewerten. Der Kontrollfluss kann durch das Workflow-Management-System Open Service Process Platform definiert werden. Im Ergebnis kann das System den Workflow je nach Komplexität möglichst energiearm ausführen.
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Virtualization of a sensor node to enable the simulation of IEC 61850-based sampled value messagesLuwaca, Emmanuel January 2014 (has links)
Thesis submitted in fulfilment of the requirements for the degree
Master of Technology: Electrical Engineering
in the Faculty of Engineering
at the Cape Peninsula University of Technology
2014 / The IEC 61850 standard, “Communication networks and systems in substations” was
promulgated to accommodate the need for a common communication platform within
substations for devices from different vendors. The IEC 61850 standard proposes a
substation automation architecture that is Ethernet-based, with a “station-bus” for
protection devices within the substation and a “process bus” where raw data from the
voltage and current transformers are published onto the data network using a device
known as a Merging Unit.
To date, most of the standardization efforts were focused at the station bus level
where event-triggered messages are exchanged between the substation automation
devices, commonly referred to as Intelligent Electronic Devices (IEDs). These
messages are known as Generic Object Oriented Substation Event messages.
Equipment from vendors to accommodate the “process bus” paradigm, however is
still limited at present.
The Centre for Substation Automation and Energy Management Systems was
established within the Electrical Engineering Department at the Cape Peninsula
University of Technology with one of its objectives being the development of
equipment either for simulation or real-time purposes in compliance with the IEC
61850 standard. In order to fulfil this long-term objective of the Centre, an in-depth
understanding of the IEC 61850 standard is required.
This document details the efforts at acquiring the requisite knowledge base in support
of the educational objectives of the Centre and the research project implements a
simulation of a merging unit which is compliant with the functional behavior as
stipulated by the standard. This limited functional implementation (i.e. non-real-time)
of the merging unit, is achieved through the development of a virtualized data
acquisition node capable of synthetic generation of waveforms, encoding of the data
and publishing the data in a format compliant with the IEC 61850-9-2 sampled value
message structure.
This functional behavior of the virtual sensor node which was implemented has been
validated against the behavior of a commercial device and the sampled value
message structure is validated against the standard. The temporal behavior of the
proposed device is commented upon. This research project forms the basis for future
real-time implementation of a merging unit.
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Developer-Centric Software AssessmentMakedonski, Philip 12 April 2018 (has links)
No description available.
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Development of an embedded system actuator node for intergration into an IEC 61850 based substation automation applicationRetonda-Modiya, John-Charly January 2012 (has links)
Thesis submitted in fulfilment of the requirements for the degree
Master of Technology: Electrical Engineering
in the Faculty of Engineering
at the Cape Peninsula University of Technology, 2012 / The introduction of the IEC 61850 standard in substations for communication networks and
systems by the International Electrotechnical Commission (IEC) in 2003 provided the
possibility for communication between devices of different manufacturers. However, the
advent of this standard also brought about many challenges associated with it.
The challenges introduced by this fairly recent standard of communications in Substation
Automation Systems (SAS), and the need for the development of cost effective IEC 61850-
compliant devices, motivated the decision of the Centre for Substation and Energy
Management Systems within the Electrical Engineering Department of the Cape Peninsula
University of Technology to focus on the implementation of the IEC 61850 standard using an
embedded hardware platform.
The development of an IEC 61850 embedded application requires substantial knowledge in
multiple domains such as data networking, software modelling and development of Intelligent
Electronic Devices (IEDs), protection of the electrical system, system simulation and testing
methods, etc. Currently knowledge about the implementation of the IEC 61850 standard
usually resides with vendors and is not in the public domain.
The IEC 61850 standard allows for two groups of communication services between entities
within the substation automation system. One group utilizes a client-server model
accommodating services such as Reporting and Remote Switching. The second group
utilizes a peer-to-peer model for Generic Substation Event (GSE) services associated with
time-critical activities such as fast and reliable communication between Intelligent Electronic
Devices (IEDs) used for protection of the power network.
The messages associated with the GSE services are the Generic Object Oriented Substation
Event (GOOSE) messages. The use of GOOSE messages for protection of the electrical
system is very important in modern substations. Detailed knowledge of the structure of these
messages is important in instances requiring fault diagnosis to determine the cause of mal–
operation or to address interoperability concerns or when developing custom IEC 61850-
compliant devices with limited functionality.
A practical protection application (overcurrent) case study is presented where GOOSE
messages are exchanged between a commercial IED and an IEC 61850-compliant controller
based on an embedded platform. The basic data model and software development of an
actuator node for a circuit breaker is proposed using an IEC 61850 communication stack on
an embedded platform. The performance of the GOOSE messages is confirmed to be as per
the functional behaviour specified, and per the IEC 68150 standard in terms of the temporal
behaviour required.
This thesis document tables the methods, software programs, hardware interfacing and
system integration techniques that allow for the development and implementation of a low
cost IEC 61850-compliant controller unit on an embedded systems platform for the
substation automation system.
The overcurrent case study distributed between a commercial IED (SIEMENS Siprotec
device) and the actuator application developed on an embedded platform for this project
(DK60 board) is in compliance with the IEC 61850 standard and utilizing GOOSE messaging
is successfully completed both in terms of functional and temporal behaviour.
This novel research work contributes not only to the academic community, but to the
international Power Systems community as a whole.
Keywords: IEC 61850 standard, IEDs, GOOSE message, software modelling, software
development, substation automation systems, communication stack, embedded systems,
actuator.
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