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Publikationen von Professorinnen und Professoren der HAW Hamburg

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Emmanuel Baccelli, Cenk Gündogan, Oliver Hahm, Peter Kietzmann, Martine Lenders, Hauke Petersen, Kaspar Schleiser, Thomas C. Schmidt und Matthias Wählisch
RIOT: an Open Source Operating System for Low-end Embedded Devices in the IoT
IEEE Internet of Things Journal, 5(6):4428--4440
Dezember 2018

Marker: TI-I

Zusammenfassung: As the Internet of Things (IoT) emerges, compact operating systems are required on low-end devices to ease development and portability of IoT applications. RIOT is a prominent free and open source operating system in this space. In this paper, we provide the first comprehensive overview of RIOT. We cover the key components of interest to potential developers and users: the kernel, hardware abstraction, and software modularity, both conceptually and in practice for various example configurations. We explain operational aspects like system boot-up, timers, power management, and the use of networking. Finally, the relevant APIs as exposed by the operating system are discussed along with the larger ecosystem around RIOT, including development and open source community aspects.

Inga Reinwardt, Nils Gerke, Peter Dalhoff, Dirk Steudel und Wolfgang Moser
Validation of wind turbine wake models with focus on the dynamic wake meandering model
Journal of Physics: Conference Series, 1037
22 Juni 2018
ISSN: 1742-6588, 1742-6596

Marker: TI-MP

Simon Ressel, Lucas Holtz, Niclas Janshen, Florian Bill, Antonio Chica, Thomas Flower, Claudia Weidlich und Thorsten Struckmann
State of charge monitoring of vanadium redox flow batteries using half cell potentials and electrolyte density
Journal of Power Sources, 378:776-783
28 Februar 2018

Marker: TI-MP

Andreas Reuter, Randy Bush, Italo Cunha, Ethan Katz-Bassett, Thomas C. Schmidt und Matthias Wählisch
Towards a Rigorous Methodology for Measuring Adoption of RPKI Route Validation and Filtering
Sigcomm Computer Communication Review, 48(1):19–27
Januar 2018

Marker: TI-I

Zusammenfassung: A proposal to improve routing security---Route Origin Authorization (ROA)---has been standardized. A ROA specifies which network is allowed to announce a set of Internet destinations. While some networks now specify ROAs, little is known about whether other networks check routes they receive against these ROAs, a process known as Route Origin Validation (ROV). Which networks blindly accept invalid routes? Which reject them outright? Which de-preference them if alternatives exist? Recent analysis attempts to use uncontrolled experiments to characterize ROV adoption by comparing valid routes and invalid routes. However, we argue that gaining a solid understanding of ROV adoption is impossible using currently available data sets and techniques. Our measurements suggest that, although some ISPs are not observed using invalid routes in uncontrolled experiments, they are actually using different routes for (non-security) traffic engineering purposes, without performing ROV. We conclude with a description of a controlled, verifiable methodology for measuring ROV and present three ASes that do implement ROV, confirmed by operators.

Dieter Scholz
Definition and Discussion of the Intrinsic Efficiency of Winglets
INCAS BULLETIN, 10(1):117-134
ISSN: 2066–8201

Schlüsselwörter: wingtip, winglet, induced drag, wing mass, aircraft design

Marker: TI-FF

Zusammenfassung: Three simple equations are derived to define the "Intrinsic Aerodynamic Efficiency of Winglets" independent of the horizontal extension of the winglet and independent of the winglet’s (relative) height. This Intrinsic Aerodynamic Efficiency allows a quick comparison of purely the aerodynamic shape of winglets independent of the selected size chosen for a certain aircraft installation. The Intrinsic Aerodynamic Efficiency is calculated in 3 steps: STEP 1: The relative total drag reduction due to the winglet is converted into an assumed contribution of the winglet only on the span efficiency factor. STEP 2: If the winglet also increases span, its performance is converted into one without the effect of span increase. STEP 3: The winglet’s reduction in induced drag is compared to a horizontal wing extension. If the winglet needs e.g. to be three times longer than the horizontal extension to achieve the same induced drag reduction, its Intrinsic Aerodynamic Efficiency is the inverse or 1/3. Winglet metrics as defined are calculated from literature inputs. In order to evaluate winglets further, the mass increase due to winglets is estimated in addition to the reduction of drag on aircraft level and fuel burn.

Y. Saalberg und M. Wolff
Multivariate Analysis as a Tool to Identify Concentrations from Strongly Overlapping Gas Spectra
Sensors 18 (5), (1562)

Marker: TI-I

Björn Lautenschlager, Sven Pfeiffer, Christian Schmidt und Gerwald Lichtenberg
Real-Time Iterative Learning Control - Two applications with time scales between years and nanoseconds

Marker: LS-MT

Janine Topp, Joachim Westenhöfer, Isabelle Scholl und Pola Hahlweg
Shared decision-making in physical therapy: a cross-sectional study on physiotherapists' knowledge, attitudes and self-reported use
Patient Education and Counseling, 10:346-351

Schlüsselwörter: Shared decision making; Patient-centered care; Communication; Physical therapy; Health services research; Online survey

Marker: LS-GW

Zusammenfassung: Objective: This study aimed a) to investigate knowledge, attitudes, and self-reported use of shared decision-making (SDM) among physiotherapists in Germany, b) to explore their association with demographic characteristics, and c) to assess barriers to the implementation of SDM. Methods: We assessed above mentioned domains using an online survey. Two-level logistic regression models were used to examine factors associated with knowledge, attitudes and self-reported use of SDM. Results: 60.5% of a total sample of 357 participants reported to have had no knowledge on SDM before participating in the survey. Attitudes towards SDM were mostly positive, half of all participants expressed a preference for SDM. About two thirds of all participants reported to use a rather paternalistic approach in routine care. Knowledge, attitudes, and self-reported use of SDM were associated with several demographic characteristics. Conclusion: SDM was perceived as an appropriate concept in physiotherapy. However, missing knowledge and limited self-reported use of SDM in routine care on the one hand and positive attitudes towards SDM on the other hand indicate a need for action. Practice implications: In order to emphasize the use of SDM in physiotherapy efforts need to be undertaken in research, clinical practice and health policy.

Gunter Groen und Sebastian Sauer
TBS-TK Rezension: "Rasch-basiertes Depressionsscreening (DESC; 1. Auflage)"
Report Psychologie, 10(43):407–408.
ISSN: 0344-9602

Marker: W&S

Susanne G.R. Klotz, Corinna Petersen-Ewert, Gesche Ketels, Martin Scherer und Annette Barzel
The German version of the Functional Walking Categories (FWC): translation and initial validation
Topics in Stroke Rehabilitation,

Marker: WS-PM

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Letzte Änderung: 23.01.15

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