1,720,958 research outputs found
Entwurf eines energiegewahren Treibermodells für eingebettete Betriebssysteme,
Full text linkIn eingebetteten Betriebssystemen ist die Kenntnis der genauen
(momentanen) Leistungsaufnahme einzelner Peripheriekomponenten
zumeißt unbekannt, sodass diese Informationen nicht in Verhaltensentscheidungen
zur Laufzeit einfließen. Zudem fehlt für die Analyse
der Systemsoftware hinsichtlich ihres Energieverhaltens ein Zusammenhang
zwischen Peripheriezugriffen und dem damit verbundenem
Verbrauch. Um diese Lücke zu schließen, wird in dieser Arbeit
die Treiberschicht eines eingebetteten Betriebssystems dahingehend
umgestaltet, dass der Energieverbrauch von Peripheriegeräten in jedem
Betriebszustand abgefragt werden kann und Treiberzugriffe mit
entsprechenden Kosten annotiert werden. Hierzu wird das Modell
der Priced Timed Automata (PTA) herangezogen und vollständig in
die Treiberimplementierung integriert. Der Ansatz wird anhand von
representativen Komponenten hinsichtlich seiner Exaktheit und seines
Ressourcenverbrauchs evaluiert, sowie eine Methodik zur vereinfachten
Treiberentwicklung nach diesem Modell vorgestell
Energy-aware design of hardware and software for ultra-low-power systems
Full text linkFuture visions of the Internet of Things and Industry 4.0
demand for large scale deployments of mobile devices while removing
the numerous disadvantages of using batteries: degradation, scale, weight,
pollution, and costs. However, this requires computing platforms with extremely
low energy consumptions, and thus employ ultra-low-power hardware, energy
harvesting solutions, and highly efficient power-management hardware and
software.
The goal of these power management solutions is to either achieve power
neutrality, a condition where energy harvest and energy consumption equalize
while maximizing the service quality, or to enhance power efficiency for
conserving energy reserves. To reach these goals, intelligent power-management
decisions are needed that utilize precise energy data.
This thesis discusses the measurement of energy in embedded systems, both
online and by external equipment, and the utilization of the acquired data for
modeling the power consumption states of each involved hardware component.
Furthermore, a method is shown to use the resulting models by instrumenting
preexisting device drivers.
These drivers enable new functionalities, such as online energy accounting and
energy application interfaces, and facilitate intelligent power management
decisions.
In order to reduce additional efforts for device driver reimplementation and
the violation of the separation of concerns paradigm, the approach shown
in this thesis synthesizes instrumentation aspects for an
aspect oriented programming language, so that the original device-driver
source code remains unaffected.
Eventually, an automated process of energy measurement and data
analysis is presented. This process is able to yield precise energy models
with low manual effort. In combination with the instrumentation synthesis of
aspect code, this method enables an accelerated creation process for energy
models of ultra-low-power systems. For all proposed methods,
empirical accuracy and overhead measurements are presented.
To support the claims of the author, first practical energy aware and
wireless-radio networked applications are showcased: An energy-neutral light
sensor, a photovoltaic-powered seminar-room door plate, and a sensor network
experiment testbed for research and education
Automatisierte Verfeinerung von Energiemodellen für eingebettete Systeme
No full textBei der Entwicklung und Nutzung von eingebetteten Systemen werden häufig Energiemodelle der einzelnen Systemkomponenten benötigt, um den Energiebedarf des Gesamtsystems abschätzen zu können. Die Erstellung und Verfeinerung solcher Modelle bedeutet meist aufwändige Handarbeit, da die notwendigen Mess- und Auswertungsschritte von den jeweiligen Komponenten abhängen. Diese Arbeit zeigt, dass es trotz der Unterschiede zwischen verschiedenen Peripheriegeräten möglich ist, mit einem generischen Konzept eine automatisierte Modellverfeinerung durchzuführen. Dazu wird anhand eines Gerätetreibers und eines vorgegebenen Automatenmodells des Geräts ein repräsentatives Testprogramm generiert, eine Reihe von Messungen durchgeführt und ausgewertet und das Automatenmodell zu einem Energiemodell verfeinert. Falls das Modell konfigurierbare Parameter wie Sendeleistung oder Datenrate angibt, werden Abhängigkeiten von diesen Parametern automatisch erkannt und analytisch beschrieben. Zusätzlich werden zwei Methoden zur Modellierung der Transitionsenergie verglichen. Eine Evaluation einer prototypischen Implementierung mit verschiedenen Arten von Peripheriegeräten zeigt, dass viele statische und dynamische Modelleigenschaften zuverlässig erkannt und modelliert werden
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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