TY - THES
A1 - Blauert, Derk-Janko
T1 - Bewertung des Potentials von Network Access Control (NAC) für die Netzwerksicherheit in modernen IT-Umgebungen mittels vergleichender Betrachtung der beiden Produkte PacketFence und macmon
N2 - In der heutigen digitalisierten Welt spielt die Sicherheit von IT-Infrastrukturen eine
entscheidende Rolle. Diese Bachelorarbeit untersucht das Potenzial von Network
Access Control (NAC) als eine IT-Lösung zur Verbesserung der Netzwerksicherheit in
modernen IT-Umgebungen. Dabei steht die Zugriffskontrolle von Personen und
Geräten im Vordergrund. Damit soll erreicht werden, dass unautorisierter Zugriff zum
Netzwerk verhindert wird. Es werden die Begrifflichkeiten, Funktionsweise und
potenzielle Angriffsvektoren von NAC untersucht. Des Weiteren werden die jeweiligen
Funktionen der NAC-Produkte macmon und der Open-Source Lösung PacketFence
gegenübergestellt. Im praktischen Teil der Arbeit werden dann die vorgestellten
Angriffsvektoren an einem Test-Netzwerk durchgeführt und analysiert.
Die Arbeit zeigt, dass NAC eine wichtige Komponente in der Zugriffskontrolle für eine
moderne IT-Infrastruktur ist. Während einige Angriffe auf das Test-Netzwerk
abgewehrt werden konnten, war es dennoch möglich, sich als Angreifer am Netzwerk
anzumelden. NAC ist ein unerlässliches Tool für größere IT-Infrastrukturen, jedoch
erfordert eine korrekte Konfiguration und effektive Nutzung von NAC ein
umfangreiches Wissen über die verschiedenen Aspekte und Themenbereiche der
Netzwerksicherheit.
N2 - In today's digitalized world, the security of IT infrastructures plays a vital role. This
bachelor's thesis examines the potential of Network Access Control (NAC) as an IT
solution to enhance network security in modern IT enviroments. The focus is on access
control for individuals and devices. The goal is to prevent unauthorized network access.
The terminology, functionality, and potential attack vectors of NAC are explored.
Furthermore, the respective functions of the NAC products macmon and the open-
source solution PacketFence are compared. In the practical part of the thesis, the
introduced attack vectors are tested on a lab network and analyzed.
The study shows that NAC is a crucial component in access control for modern IT
infrastructure. While some attacks on the test network were successfully prevented, it
was still possible for an attacker to gain access to the network. NAC is an indispensable
tool for larger IT infrastructures. However proper configuration and effective use of
NAC require extensive knowledge of the various aspects and topics of network security.
KW - Informationssicherheit
KW - Datenverarbeitungssystem
KW - Computersicherheit
Y1 - 2023
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:522-opus4-29514
PB - Technische Hochschule Brandenburg
CY - Brandenburg an der Havel
ER -
TY - RPRT
A1 - Schugardt, Alexander
T1 - Untersuchung der Rotorfestigkeit von permanenterregten Synchronmaschinen mit vergrabenen Magneten
N2 - Diese Projektarbeit behandelt die mechanische Simulation der Rotoren von permanenterregten Synchronmaschinen für den Festigkeitsnachweis. Hierzu wird die Finite-Elemente-Methode mit dem Programm CalculiX verwendet. Als Beispiel wird der Elektromotor des Toyota Prius II im Detail betrachtet. Hierbei werden die unterschiedlichen Lasten modelliert, dazu zählen neben der Zentrifugalkraft auch der Innendruck durch eine Presspassung sowie die elektromagnetischen Kräfte. Für die Modellierung von Kräften auf der Rotoroberfläche wird eine Methodik zur Umsetzung in CalculiX entwickelt und anhand eines Beispielmodells demonstriert. Der angestrebte Festigkeitsnachweis kann im Rahmen dieser Arbeit erbracht werden. Weiterhin wird gezeigt, dass der Einfluss der elektromagnetischen Kräfte im Arbeitspunkt mit der höchsten Drehzahl sehr gering ausfällt. Insgesamt bietet diese Arbeit die Grundlagen für mechanische Modellierungen von Rotoren unter Berücksichtigung aller Kräfte. Dies kann direkt auf andere Elektromotoren angewendet werden.
KW - Rotor
KW - Finite-Elemente-Methode
KW - Elektromotor
Y1 - 2023
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:522-opus4-29610
PB - Technische Hochschule Brandenburg
CY - Brandenburg an der Havel
ER -
TY - THES
A1 - Kenfack, Divine Leopold
T1 - Erhöhung der Phishing-Resistenz von Anmeldeverfahren durch Einsatz von FIDO2 und Passkey
N2 - In dieser Forschung wird es gezeigt, wie sicher und benutzerfreundlich eine Authentifizierung mit Passkey/FIDO2 auf Ebene des Web-Browsers ist, im Vergleich zu einer Authentifizierung mit einem starken Passwort oder eine Authentifizierung aus einer Kombination von einem Passwort und einer Zwei-Faktor-Authentifizierung.
KW - Authentifizierung
KW - Computersicherheit
KW - Phishing
Y1 - 2023
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:522-opus4-29688
PB - Technische Hochschule Brandenburg
CY - Brandenburg an der Havel
ER -
TY - CHAP
A1 - Seyerlein-Klug, Annegrit
A1 - Adler, Rasmus
ED - Wahlster, Wolfgang
ED - Winterhalter, Christoph
T1 - 4.2.: Sicherheit
T2 - Deutsche Normungsroadmap Künstliche Intelligenz
Y1 - 2023
SP - 105
EP - 120
PB - DKE - Deutsche Kommission Elektrotechnik Elektronik Informationstechnik in DIN und VDE
CY - Berlin/Offenbach am Main
ET - 2
ER -
TY - JOUR
A1 - Uhl, Roland
T1 - Charakterisierung des Erwartungswertes am Graphen der Verteilungsfunktion
N2 - Der Erwartungswert einer Zufallsgröße kann generell am Graphen ihrer Verteilungsfunktion durch eine naheliegende Gleichheit zweier Flächeninhalte festgelegt werden. Äquivalent dazu lässt er sich mit zwei uneigentlichen Riemann-Integralen darstellen. Davon ausgehend werden die Tschebyschow-Ungleichung und ihre Modifikation mit strikten Ungleichheitszeichen hergeleitet.
KW - Erwartungswert
KW - Verteilungsfunktion
KW - Čebyšev-Ungleichung
KW - Wahrscheinlichkeitsrechnung
KW - Tschebyschow-Ungleichung
KW - Zufallsgröße
Y1 - 2023
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:522-opus4-29862
PB - Technische Hochschule Brandenburg
CY - Brandenburg an der Havel
ER -
TY - CHAP
A1 - Grunwald, Guido
A1 - Schwill, Jürgen
A1 - Sassenberg, Anne-Marie
T1 - How to Choose the Fitting Partner in Sustainability Sponsorship? A Decision Model Integrating Multiple Fit Dimensions
T2 - Konferenz: 2021 AMS Virtual Annual Conference and World Marketing Congress, 2022/ Band: Celebrating the Past and Future of Marketing and Discovery with Social Impact 2021 AMS Virtual Annual Conference and World Marketing Congress
Y1 - 2023
SN - 978-3-030-95345-4
U6 - https://doi.org/10.1007/978-3-030-95346-1_157
SP - 465
EP - 477
PB - Springer Cham
ER -
TY - JOUR
A1 - Maurer, Robert
A1 - Eifert, Felix Friedrich
A1 - Annan, Tarek
T1 - Remote Work in Kooperationsprojekten - Fluch oder Segen?!
JF - Mittelstand-Digital Magazin - Wissenschaft trifft Praxis
N2 - Der vorliegende Beitrag befasst sich mit den Herausforderungen, die im Rahmen von Remote Work
in Kooperationen bezüglich der Informations- und
IT-Sicherheit bestehen, insbesondere im Hinblick auf
den sicheren Datenaustausch. Des Weiteren wird die
Wichtigkeit einer ganzheitlichen Sicht von IT-Governance-, Risiko- und Compliance-Management in Verbünden kleiner und mittlerer Unternehmen (KMU)
behandelt. Weiterhin wird aufgezeigt, was bei der
informationstechnischen Absicherung von Kooperationen und IT-Konsortien beachtet werden sollte.
Y1 - 2023
SN - 2198-8544
SN - 2198-9362
IS - 19/9
SP - 15
EP - 20
PB - Begleitforschung Mittelstand-Digital WIK GmbH
ER -
TY - GEN
A1 - Das, Atanu
A1 - Chaurasia, Prashtan Kumar
A1 - Mandal, Gopi K.
A1 - Goecke, Sven-Frithjof
A1 - De, Amitava
T1 - Sample calculations to estimate joint distortion based on the published article "Analytical Estimation of Thermomechanical Distortion and Interface Layer Thickness for Gas Metal Arc Lap Joining of Dissimilar Sheets"
N2 - A sample set of calculations is presented in this supplemental document to analytically estimate joint distortion for gas metal arc lap joining of aluminum and steel thin sheets following the published article "Analytical Estimation of Thermomechanical Distortion and Interface Layer Thickness for Gas Metal Arc Lap Joining of Dissimilar Sheets"
Y1 - 2023
ER -
TY - JOUR
A1 - Das, Atanu
A1 - Chaurasia, Prashtan Kumar
A1 - Mandal, Gopi K.
A1 - Goecke, Sven-Frithjof
A1 - De, Amitava
T1 - Analytical estimation of thermomechanical distortion and interface layer thickness for gas metal arc lap joining of dissimilar sheets
JF - Welding in the World
Y1 - 2023
U6 - https://doi.org/10.1007/s40194-01426-x
SN - 432288
IS - 76/2023
SP - 33
EP - 49
PB - Springer Link
ER -
TY - JOUR
A1 - Chaurasia, Prashtan Kumar
A1 - Goecke, Sven-Frithjof
A1 - De, Amitava
T1 - Monitoring melt pool asymmetry in gas metal arc-directed energy deposition
JF - Science and Technology of Welding and Joining
Y1 - 2023
U6 - https://doi.org/10.1080/13621718.2023.2168933
SN - 1362-1718 (PRINT)
IS - Augabe 5/ Band 28
SP - 424
EP - 432
PB - Taylor and Fracis
ER -
TY - JOUR
A1 - Chaurasia, Prashant Kumar
A1 - Goecke, Sven Frithjof
A1 - De, Amitava
T1 - Towards real-time monitoring of metal transfer and melt pool temperature field in gas metal arc directed energy deposition
JF - Welding in the World
N2 - Large three-dimensional metallic parts can be printed layer-by-layer using gas metal arc directed energy deposition (GMA-DED) process at a high deposition rate and with little or no material wastage. Fast responsive real-time monitoring of GMA-DED process signatures and their transient variations is required for printing of dimensionally accurate and structurally sound parts. A systematic experimental investigation is presented here on multi-layer GMA-DED with two different scanning strategies using a high strength low alloy (HSLA) filler wire. The dynamic metal transfer, melt pool temperature field and its longitudinal cross-section, and arc voltage and current are monitored synchronously. The transient arc heat input and the melt pool solidification cooling rate are estimated from the monitored signals. The layer-wise variations of the melt pool dimension, surface temperature profile, thermal cycles, and solidification cooling rate are examined for different scanning strategies. It is comprehended that the part defects can be minimized, and the mass production of zero-defect parts can be achieved in GMA-DED process with synchronized monitoring and assessment of the real-time process signatures.
Y1 - 2023
UR - https://link.springer.com/article/10.1007/s40194-023-01534-2
U6 - https://doi.org/https://doi.org/10.1007/s40194-023-01534-2
IS - 67
SP - 1781
EP - 1791
PB - Springer Link
ER -
TY - JOUR
A1 - Revina, Aleksandra
A1 - Aksu, Ünal
T1 - An approach for analyzing business process execution complexity based on textual data and event log
JF - Information Systems
N2 - With the advent of digital transformation, organizations increasingly rely on various information systems to support their business processes (BPs). Recorded data, including textual data and event log, expand exponentially, complicating decision-making and posing new challenges for BP complexity analysis in Business Process Management (BPM). Herein, Process Mining (PM) serves to derive insights based on historic BP execution data, called event log. However, in PM, textual data is often neglected or limited to BP descriptions. Therefore, in this study, we propose a novel approach for analyzing BP execution complexity by combining textual data serving as an input at the BP start and event log. The approach is aimed at studying the connection between complexities obtained from these two data types. For textual data-based complexity, the approach employs a set of linguistic features. In our previous work, we have explored the design of linguistic features favorable for BP execution complexity prediction. Accordingly, we adapt and incorporate them into the proposed approach. Using these features, various machine learning techniques are applied to predict textual data-based complexity. Moreover, in this prediction, we show the adequacy of our linguistic features, which outperformed the linguistic features of a widely-used text analysis technique. To calculate event log-based complexity, the event log and relevant complexity metrics are used. Afterward, a correlation analysis of two complexities and an analysis of the significant differences in correlations are performed. The results serve to derive recommendations and insights for BP improvement. We apply the approach in the IT ticket handling process of the IT department of an academic institution. Our findings show that the suggested approach enables a comprehensive identification of BP redesign and improvement opportunities.
Y1 - 2023
UR - https://www.sciencedirect.com/science/article/pii/S0306437923000200?via%3Dihub
U6 - https://doi.org/10.1016/j.is.2023.102184
IS - 114
PB - Elsevier
ER -
TY - CHAP
A1 - Revina, Aleksandra
A1 - Rizun, Nina
A1 - Aksu, Ünal
T1 - Towards a Framework for Context Awareness Based on Textual Process Data: Case Study Insights
T2 - Lecture Notes in Business Information Processing
N2 - Context awareness is critical for the successful execution of processes. In the abundance of business process management (BPM) research, frameworks exclusively devoted to extracting context from textual process data are scarce. With the deluge of textual data and its increasing value for organizations, it becomes essential to employ relevant text analytics techniques to increase the awareness of process workers, which is important for process execution. The present paper addresses this demand by developing a framework for context awareness based on process executions-related textual data using a well-established layered BPM context model. This framework combines and maps various text analytics techniques to the layers of the context model, aiming to increase the context awareness of process workers and facilitate informed decision-making. The framework is applied in an IT ticket processing case study. The findings show that contextual information obtained using our framework enriches the awareness of process workers regarding the process instance urgency, complexity, and upcoming tasks and assists in making decisions in terms of these aspects.
Y1 - 2023
SN - 978-3-031-26885-4 (Print) 978-3-031-26886-1 (online)
U6 - https://doi.org/https://doi.org/10.1007/978-3-031-26886-1_2
IS - 466
PB - Springer Cham
ER -
TY - BOOK
A1 - Tanski, Joachim
T1 - Compliance-Management
N2 - Dieses Buch bietet eine komprimierte und praxisorientierte Einführung in die Grundlagen und Anforderungen eines Compliance-Managements, um den Leser schnell mit aktuellen und zentralen Regelungen vertraut zu machen. Dabei wird auf gesetzliche und regulatorische Bestimmungen ebenso eingegangen wie auf betriebswirtschaftliche Notwendigkeiten, um Mitarbeitende und Unternehmen vor den schwerwiegenden Folgen von Compliance-Verstößen zu schützen.
Y1 - 2023
UR - https://link.springer.com/book/10.1007/978-3-658-40682-0
SN - 978-3-658-40681-3 (Softcover) 978-3-658-40682-0 (e-Book)
U6 - https://doi.org/https://doi.org/10.1007/978-3-658-40682-0
PB - Springer Gabler Wiesbaden
ET - 1
ER -
TY - CHAP
A1 - Tanski, Joachim
T1 - Limitierende Faktoren
T2 - Compliance-Management
N2 - Wie bei allen Risiken gibt es auch bei Compliance-Risiken kein Null-Risiko. Man wird in der Praxis noch nicht einmal in die unmittelbare Nähe einer Null kommen. Ein Null-Compliance-Risiko ist auch deshalb nicht erreichbar, weil sich ständig neue Risikofelder auftun. So beispielsweise durch Änderung von Geschäftsmodellen oder Vertriebswegen oder durch neue rechtliche Rahmenbedingen.
Y1 - 2023
UR - https://link.springer.com/chapter/10.1007/978-3-658-40682-0_4
U6 - https://doi.org/10.1007/978-3-658-40682-0_4
SP - 49
EP - 49
PB - Springer ebooks
ER -
TY - CHAP
A1 - Burger-Menzel, Bettina
T1 - Wirtschaftsförderung und E-Governance: Von der Resilienz zur Transformation?
T2 - Wirtschaftsförderung in der Krise
N2 - Unsere Welt verändert sich in unterschiedlichen Tempi und Verwerfungstiefen. Dies ist das einzig Verlässliche für Wirtschaft und Gesellschaft.
Zum einen zählt die kreative Zerstörung zum ‚Markenkern‘ marktwirtschaftlicher Systeme. Die Wirtschaftsakteure stehen dadurch an ihrem jeweiligen Standort unter einer Art (produktivem) Dauerstress. Es gibt Gewinner und Verlierer, weil Wettbewerber unterschiedlich erfolgreich kostensenkende Rationalisierungen, technischen Fortschritt und die Erschließung neuer (globaler) Märkte realisieren. Der damit einhergehende Strukturwandel gilt als wirtschaftssystemischer Normalzustand.
Zum anderen gibt es Krisen. Und auch ‚unter Schock‘ (re-)agieren Akteure ungleich, wie die Corona-Pandemie oder abrupte Veränderungen durch die Finanzkrise zeigen. Einige Akteure und Standorte bleiben mit ihrem jeweiligen Profil und Potenzial (weiterhin) produktiv widerstandsfähig. Für andere verschärfen sich der wirtschaftliche Niedergang und dessen Folgen für die Arbeitsmärkte und Lebensqualität der Betroffenen.
Regionale Wirtschaftsförderung unterstützt, dass sich die Wirtschaftsstrukturen an einem Standort überlebensfähig ausrichten. Doch kann sie auch beim Umgang mit Krisen einen Mehrwert erzielen und zählt dies überhaupt zu ihrem Regelauftrag? Und welche Rolle spielt die Digitalisierung? Der Beitrag stellt den sachlogischen Zusammenhang zwischen diesen Teilfragen her und ordnet neuere Ansätze ein. Zudem werden Ansatzstellen aufgezeigt, um die regionale Wirtschaftsförderung praxisorientiert weiterzuentwickeln. ‚Electronic Government‘ (E-Government) beschreibt dabei den Einsatz von Informationstechnik, Telekommunikation und Medien (ITKM) im öffentlichen Sektor, während ‚Electronic Governance‘ (E-Governance) hybride oder private Akteure miteinbezieht.
Der Beitrag ist wie folgt strukturiert: Zunächst werden Schlüsselbegriffe wie Strukturpolitik und Resilienz geklärt und mit den Kontextfaktoren verknüpft, welche die Steuerungslogik von Wirtschaftsförderung bestimmen. Danach wird diskutiert, inwiefern die Wirtschaftsförderung E-Government und E-Governance nutzen kann, um Resilienz zu stärken und möglichst transformativ wirken zu können.
Y1 - 2023
UR - https://link.springer.com/chapter/10.1007/978-3-658-41390-3_10
U6 - https://doi.org/10.1007/978-3-658-41390-3_10
SP - 171
EP - 196
PB - Springer Gabler
CY - Wiesbaden
ER -
TY - CHAP
A1 - Fitz, Lukas R. G.
A1 - Veldyaeva, Ekaterina
A1 - Teutenberg, Lukas
A1 - Scheeg, Michaela
A1 - Scheeg, Jochen
T1 - Puzzle away the Puzzledness: Action-Design Study of an Educational Escape Room for Intervention in SMEs’ Perception towards ICT Adoption
T2 - Konferenz: 57th Hawaii International Conference on System Sciences (HICSS); Honolulu, HI, USA
N2 - Digital transformation initiatives in small and medium-sized enterprises (SME) are often hampered by individual practitioners' perceptions of information and communication technology (ICT). This research employs an educational escape room (ER) game for an intervention towards informed decision-making on ICT adoption in SMEs. ER design and implementation are elaborated and consequently tested with SME practitioners, all embedded in an action-design study based on a qualitative research methodology. The result highlights a trade-off between creating immersive game experiences and achieving learning objectives. Still, the outcome implies an impact on players' perception of ICT integrated in the ER. The findings contribute to the emerging field of serious games for learning and shed light on the potential of game-based interventions for SMEs.
Y1 - 2023
UR - https://hdl.handle.net/10125/107027
SN - 978-0-9981331-7-1
SP - 5347
EP - 5356
ER -
TY - CHAP
A1 - Kramann, Guido
T1 - AOGscript – Design of a Stand-Alone Scripting Language for the Generation of Music. Proceedings of the International Symposium on Ubiquitous Music, 2023
T2 - Konferenz: 13th International Symposium on Ubiquitous Music 2023 (Ubimus23) , Ulster University, Derry~Londonderry, Northern Ireland, 2-4 November, 2023
N2 - Ubiquitous Music is an interdisciplinary research area that combines methodologies from music, computer science, education, creativity studies, human sciences and engineering.
The Ubiumus 2023 symposium, held at Ulster University and North West Regional College in Derry~Londonderry, Northern Ireland, included contributions on the following topics:
Rapid Prototyping and Live Environments
Ecological Approaches to Ubiquitous Music
Ubiquitous Music Creative Practices, Tools and Influences
The symposium also included a number of artistic contributions and workshops, which are also discussed in the proceedings volume. A number of events (including all paper presentations, an invited lecture, a panel discussion, and a keynote and associated performance) were also documented via video, with a link available in this Proceedings volume.
Y1 - 2023
UR - https://zenodo.org/records/10670220
SN - 978-65-00-85069-7
U6 - https://doi.org/10.5281/zenodo.10670220
SP - 95
EP - 109
PB - Zenodo
ER -
TY - INPR
A1 - Tarassow, Artur
T1 - The potential of LLMs for coding with low-resource and domain-specific programming languages
N2 - This paper presents a study on the feasibility of using large language models (LLM) for coding with low-resource and domain-specific programming languages that typically lack the amount of data required for effective LLM processing techniques. This study focuses on the econometric scripting language named hansl of the open-source software gretl and employs a proprietary LLM based on GPT-3.5. Our findings suggest that LLMs can be a useful tool for writing, understanding, improving, and documenting gretl code, which includes generating descriptive docstrings for functions and providing precise explanations for abstract and poorly documented econometric code. While the LLM showcased promoting docstring-to-code translation capability, we also identify some limitations, such as its inability to improve certain sections of code and to write accurate unit tests. This study is a step towards leveraging the power of LLMs to facilitate software development in low-resource programming languages and ultimately to lower barriers to entry for their adoption.
Y1 - 2023
U6 - https://doi.org/10.48550/arXiv.2307.13018
SP - 1
EP - 27
ER -
TY - CHAP
A1 - Guido, Kramann
T1 - AOGscript, Generative Code as Conceptual Artwork: Giving Space to Astonishment. Proceedings of xCoAx 2023
T2 - Konferenz: xCoAx 2023 11th Conference on Computation, Communication, Aesthetics & X
Y1 - 2023
UR - https://2023.xcoax.org/xcoax2023.pdf
SN - 978-989-9049-52-9
U6 - https://doi.org/10.34626/xcoax.2023
SP - 401
EP - 408
PB - i2ADS
CY - Porto, Portugal
ER -
TY - INPR
A1 - Baeva, Gergana
A1 - Brunner, Robert
A1 - Elmas, Filiz
A1 - Fresz, Benjamin
A1 - Fuß, Christine
A1 - Heß, Claudia
A1 - Kellmeyer, Philipp
A1 - Mahner, Malin
A1 - Paulheim, Heiko
A1 - Poretschkin, Maximilian
A1 - Puntschuh, Michael
A1 - Seyerlein-Klug, Annegrit
T1 - Welche Zertifizierung ist hilfreich für Verbraucher*innen?
BT - Acht Thesen zu wirksamen freiwilligen Zertifikaten von KI-Produkten
N2 - In diesem Whitepaper fokussieren wir uns auf die KI-Verordnung nicht erfasste freiwillige Zertifizierung. Dabei stehen die Interessen und Sichtweisen der Verbraucher*innen im Vordergrund. Als Verbraucher*innen betrachten wir nicht nur die unmittelbaren Nutzer*innen von KI-Systemen, sondern auch Privatpersonen, die indirekt von KI-Ergebnissen betroffen sein können. Zudem berücksichtigen wir Menschen in der Rolle als souveräne Datensubjekte, deren personenbezogene Daten in die Entwicklung von KI-Systemen einfließen. Dieses breite Verständnis des Verbraucher*innenbegriffs entspricht dem Selbstverständnis des Zentrums für vertrauenswürdige Künstliche Intelligenz (ZVKI). Wir stellen Thesen auf, wie freiwillige Zertifizierungen von KI-Systemen für Verbraucher*innen nützlich sein können. Die im Verlauf vorgestellten und begründeten acht Thesen wurden in einer Reihe von interdisziplinären Workshops erarbeitet. Dabei identifizierten wir Herausforderungen einer KI-Zertifizierung aus Verbraucher*innensicht und präzisierten diese iterativ. Die Gruppendiskussionen dienten als Grundlage dieses Whitepapers und bauten auf Erkenntnissen der Fach-Arbeitsgruppe „KI Zertifizierung“ des ZVKI auf. Alle Co-Autor*innen waren an der Erstellung des finalen Texts beteiligt. Die aufgestellten Thesen thematisieren grundlegende Anforderungen an eine KI-Zertifizierung aus einer übergeordneten Perspektive, unabhängig von den spezifischen Details einer KI-Anwendung. Somit liefern sie keine Aussagen zu konkreten Inhalten der Zertifizierung. Detaillierte Empfehlungen setzen eine umfassende Analyse von Einsatzfällen voraus, die in diesem Rahmen nicht geleistet werden kann.
Y1 - 2023
U6 - https://doi.org/10.24406/publica-2132
ER -
TY - RPRT
A1 - Olschewski, Detlef
A1 - Bluhm, André
A1 - Firnkorn, Joerg
A1 - Lucieri, Adriano
A1 - Palacio, Sebastian
A1 - Streppel, Yeji
A1 - Zednik, Carlos
A1 - Görge, Rebekka
A1 - Poretschkin, Maximilian
A1 - Becker, Nikolas
A1 - Zielke, Thomas
A1 - Kruschel, Christian
A1 - Neumann-Brosig, Matthias
A1 - Bäuerle, Stephen
A1 - Eifert, Marton
A1 - López, Erik Martori
A1 - Assion, Felix
A1 - Seyerlein-Klug, Annegrit
A1 - Schmid, Ute
A1 - Haufe, Stefan
A1 - Gautier, Antoine
A1 - Bieringer, Lukas
A1 - Besold, Tarek R.
A1 - Cremers, Armin B.
T1 - DIN SPEC 92001-3 Artificial Intelligence - Life Cycle Processes and Quality Requirements - Part 3: Explainability
N2 - DIN SPEC 92001-3 Artificial Intelligence – Life Cycle Processes and Quality Requirements. Artificial Intelligence has become a game-changer, but its impact must be approached responsibly. This is the third document in a series, and it aims to ensure that AI systems are developed, deployed, and used efficiently, responsibly, and in a trustworthy way. It focuses on “Explainability” – the ability to understand how AI makes decisions. This DIN SPEC 92001-3 provides a domain-independent guide on promoting explainability throughout the AI system’s life cycle. It tackles “opacity”, describing sources and effects of opacity in AI and how explanations can mitigate them. The goal is to foster a better understanding and effective use of Explainable AI across various applications, fostering principles of trust and transparency in AI-based systems. This DIN SPEC is the result of „Zertifizierung von Standard-KI-Anwendungen (Zertifizierte KI project)“ https://www.zertifizierte-ki.de/. The publication is available for free at Beuth Verlag GmbH www.beuth.de - plus the search for "DIN SPEC 92001-3"
Y1 - 2023
PB - Beuth Verlag
ER -
TY - CHAP
A1 - Veldyaeva, Ekaterina
A1 - Fitz, Lukas R. G.
A1 - Scheeg, Jochen
T1 - Developing Digital Competencies in Small and Medium-Sized Enterprises Through Microlearning Applications: A Research Agenda
T2 - Konferenz: Perspectives in Business Informatics Research
22nd International Conference on Business Informatics Research, BIR 2023, Ascoli Piceno, Italy, September 13–15, 2023, Proceedings
N2 - This article presents a research outline on the use of microlearning applications to develop digital competencies in Small and Medium-sized Enter-prises (SMEs). The digital transformation of businesses has become essential for their survival, and SMEs need to develop digital competencies (DC) to remain competitive in the market. Microlearning (ML), a form of learning that involves small, bite-sized learning modules, has been gaining popularity in recent years as a way to efficiently and effectively develop skills. Through a semi-systematic literature review approach, our study examines prevalent knowledge in the area of ML and DC and discusses interrelations. As a result, we propose a research roadmap consisting of six research questions targeting four dimensions of ML for DC development in SMEs: 1) context, 2) formats, 3) reward system, and 4) complexity level.
Y1 - 2023
U6 - https://doi.org/10.1007/978-3-031-43126-5_7
SP - 41
EP - 58
ER -
TY - CHAP
A1 - Lemke, Claudia
A1 - Meister, Vera
A1 - Weßels, Doris
T1 - Kritische Reflexion und Handlungsansätze zum Einsatz Generativer KI in der Wirtschaftsinformatik-Lehre
T2 - 36. Jahrestagung des Arbeitskreises Wirtschaftsinformatik (AKWI)
N2 - Die digitalen Technologien verändern die Gesellschaft, auch die akademischen Wissen-schaftssysteme sind betroffen. Das erfordert verstärkte Überlegungen zum Einsatz solcher Techno-logien und zu ihrem Einfluss auf Lehre und Studium. Der Beitrag fokussiert die Relevanz von AI-Literacy im Kontext des Einsatzes Generativer KI aus zwei Perspektiven. Zunächst wird die Wahr-nehmung und Bereitschaft von Studierenden, KI-basierte Tools zur automatisierten Textgenerierung zu nutzen, empirisch untersucht. Im zweiten Teil wird ein auf Ko-Kreation ausgerichtetes Lehrkon-zept modelliert, das neben fachlichen auch AI-Literacy-Kompetenzen adressiert. Die Ergebnisse führen zu Handlungsansätzen, insbesondere für Wirtschaftsinformatik-Studiengänge.
Y1 - 2023
ER -
TY - CHAP
A1 - Markgraf, Klaus
A1 - Dietrich, Benjamin
A1 - Müller, Katja
A1 - Flassig, Robert J
A1 - Flassig, Peter Michael
T1 - FINEconcepts - Wissenstransfer und Energiesystemoptimierung mithilfe des digitalen Zwillings
T2 - Konferenz: NWK 2023, HS Harz
N2 - Climate change, but also geopolitical circumstances, are moving topics such as energy efficiency and renewable energies more and more into the focus of the population, economy , and politics. As a result, the will to optimize new and existing energy systems extends from private individuals to companies and even entire communities. This work describes the development and usage of a new software called FINEconcepts which creates a digital twin of an energy system. This virtual model can then be used to optimize the energy system based on annual costs, CO2 emissions or other relevant criteria such as self-sufficiency. Because all system components, which include renewable technologies as well, can be added as a building block with chosen but changeable parameters, the software allows the user to explore and awaken interest and understanding of technologies that were previously considered too costly, irrelevant, or unrealistic. Implemented projects in small and large companies as well as in residential areas did prove, that the usage of FINEconcepts leads not only to more efficient energy systems by increasing the use of renewable energy, but also increased knowledge and understanding in terms of energy. Besides economics, ecology and security, understanding is an equally important factor in achieving a sustainable energy supply.
Y1 - 2023
SP - 428
EP - 435
ER -
TY - BOOK
A1 - Brasche, Ulrich
T1 - Climate justice and the Global South - The road to solving climate change
N2 - Climate will be decided in the global south Mankind is on a dangerous journey in the Anthropocene. Arriving at a good life for all within planetary boundaries is still possible. But at present, the journey is more likely to lead to an overheating of the Earth. Health and life would then be massively endangered for many living beings - including humans. A positive development is still possible, but it requires a global transformation of the economy and society. The prosperous states and companies are well advised, to respect the interests of the global south and future generations, and to use wisely the considerable financial resources in a cooperation of equals. This book • highlights past carbon emissions and their consequences, • reflects on the main drivers of future emissions, • discusses strategies like green growth, de-growth, • presents market-based instruments like carbon trading and carbon border adjustment and • emphasises the key role played by the emerging countries of the global south. It is not only a matter of justice but furthermore in the interest of the rich countries in the global north to contribute massively to financing a "green leapfrogging" of the global south into a carbon-free prosperity. Failing to achieve it will bring unspeakable losses and suffering to many people all over the planet.
Y1 - 2023
SN - Print 9783758302381
SN - Ebook 9783758398162
PB - Books on Demand
ER -
TY - CHAP
A1 - Fitz, Lukas R. G.
A1 - Scheeg, Jochen
T1 - Small Businesses Participating in Digital Platform Ecosystems - A Descriptive Literature Review
T2 - Digital Transformation. PLAIS EuroSymposium 2023. Lecture Notes in Business Information Processing
N2 - The emergence of digital multi-sided platforms has disrupted day-to-day business in many industries. Nowadays, many small businesses participate in digital platform (DP) ecosystems and act as value creators or complementors. Investigating the small business perspective does not have a rich tradition in platform research yet. In response, this paper presents a systematic literature review (SLR) analyzing the thematic points of focus and highlighting new avenues for information systems and small business research. We find that objectives related to digital transformation, digital strategy- and business model-development, and DP adoption are fundamental topics in the conjunction of small business and DP ecosystems. Based on the findings, an agenda for future research is developed, including propositions for practice-oriented and human-centered approaches fostering sustilience, innovation capabilities and digital leadership competencies in small businesses facing DP ecosystem participation.
Y1 - 2023
U6 - https://doi.org/10.1007/978-3-031-43590-4_3
ER -
TY - CHAP
A1 - Fitz, Lukas R. G.
A1 - Scheeg, Jochen
T1 - What is Digital about Digital Innovation? An Ontological Discussion of Digitality
T2 - Konferenz: 29th Americas Conference on Information Systems
N2 - "Digital" is a popular adjective for concepts related to electronic, computerized or networked processes in current research and practice. From an ontological-theoretical perspective, the prevalence of digital things triggers the question, how Digitality itself could be conceptualized. This article studies the ontology of Digitality and consequently discusses Digital Innovation (DI) from a new perspective. First, literature on Digitality is analyzed. Based on the findings, an ontological conceptual framework of Digitality (OCFD) is proposed. It describes four layers of Digitality: physical foundations, virtuality, digital culture and world, and digital metaphysics. From a human perspective, requirements to grasp and embody Digitality are highlighted, as well as the expansion of reality. Finally, Digitality is discussed as a paradigm of DI and exemplary digital phenomena are projected onto the OCFD. This paper contributes to DI research and practice through theory-building towards a better understanding of ontological characteristics and practical implications of Digitality in DI.
Y1 - 2023
PB - Panama City, Panama
ER -
TY - CHAP
A1 - Mingione, Michela
A1 - Kristal, Samuel
T1 - Brand value co-creation: field emergence, applications, measurement and future research directions
T2 - A Research Agenda for Brand Management in a New Era of Consumerism
Y1 - 2023
U6 - https://doi.org/10.4337/9781803925516.00013
SP - 89
EP - 106
PB - Edward Elgar Publishing
CY - Cheltenham, UK
ER -
TY - CHAP
A1 - Levina, Olga
A1 - Mattern, Saskia
T1 - Ethical and Legal Analysis of Machine Learning Based Systems: A Scenario Analysis of a Food Recommender System
T2 - Recommender Systems: Legal and Ethical Issues
N2 - Laws are the reflection of the ethical and moral principles of the society. While the use of technology influences users’ behavior in a pace that is affected by the technology introduction to the market, legal activities can be driven by the society as the results of such interactions. This scenario analysis- based research focuses on a classic but fictional food recommender system and the ethical issues that might occur from its usage. The recommender system is taken here as an example of machine learning-based systems (MLS) that can often be found in the individual, business and administrative applications. The research compares the existing legal solutions, with the focus on the GDPR legislation, and the discovered ethical issues. The ethical analysis is led along the ALTAI principles suggested by the European Commission, the common good approach as well as the general principles constituted in human rights. While the GDPR-based analysis showed that this data- and privacy-based legislation addressed most of the identified ethical issues, questions related to the common good approach in the context of environment and mobility that arise due to the wide spectrum of the MLS usage require further legal discussion. The application of the two approaches shows that conducting the ethical and legal analysis is beneficial for both the designers of such MLS as well as the legal actors. The findings can enhance the design and functions of a user-facing MLS as well as influence or validate legal activities.
Y1 - 2023
SN - 978-3-031-34806-8
SN - 978-3-031-34804-4
U6 - https://doi.org/10.1007/978-3-031-34804-4_9
SP - 165
EP - 185
ER -
TY - BOOK
A1 - Brasche, Ulrich
T1 - Auf dem Weg zu mehr Klimagerechtigkeit Im Bündnis mit dem Globalen Süden Widerstände überwinden
N2 - Die Menschen sind im Anthropozän auf einer gefährlichen Reise. Das Ziel steht noch nicht fest. Die Ankunft in einem guten Leben für alle innerhalb planetarer Grenzen ist immer noch möglich. Aber zurzeit führt die Reise eher zu einer Überhitzung der Erde. Gesundheit und Leben wären dann für viele Lebewesen – auch für den Menschen – massiv gefährdet. Das Buch behandelt die Fragen: • Wie sind wir in diese Lage geraten? • In welcher Richtung können Auswege liegen? • Welche Hindernisse sind zu überwinden? Es werden Strategien abgewogen und einige überraschende Bündnispartner identifiziert. Geschickt gestaltete Märkte können helfen, die Erderwärmung aufzuhalten. Nur in einer gleicheren und gerechteren Welt könnten alle Menschen gut, aber bescheidener leben. Die Alternative dazu wäre eine übererhitzte, gefährliche Welt. Eine gute Entwicklung ist noch möglich. Sie erfordert eine globale Transformation von Wirtschaft und Gesellschaft. Die wohlhabenden Staaten sind gut beraten, die Interessen des „Globalen Südens“ und der künftigen Generationen zu respektieren – auch durch den klugen Einsatz erheblicher Finanzmittel und eine Kooperation auf Augenhöhe.
Y1 - 2023
SN - 978-3-98726-045-2
U6 - https://doi.org/10.14512/9783987262746
PB - oekom-Verlag
CY - München
ER -
TY - CHAP
A1 - Levina, Olga
T1 - Operationalizing Ethics for Information Systems Design - A Tool for Ethical Software
T2 - Konferenz: Twenty-ninth Americas Conference on Information Systems (AMCIS), Panama, 2023
N2 - Propagation of information technology in the increasingly diverse domains, raises question concerning moral implications. While the number of ethical principles in the IT design is growing, they do not necessarily apply to specific products, which means developers and e.g. purchasing agent need to contextualize them for each specific IT product. This paper describes an actionable artifact that allows assessment of ethical non-functional requirements of an information system through operationalization of ethical values, Ethical Software Assessment Tool (ESAT). It is based on a survey of values that are currently considered in research and practice as well as in legal initiatives in IT context. The ethical approach and principles operationalized in ESAT are presented and discussed.
Y1 - 2023
UR - https://aisel.aisnet.org/amcis2023/sig_phil/sig_phil/5
ER -
TY - JOUR
A1 - Vega, Catherine Perez
A1 - Jechow, Andreas
A1 - James A., Campbell
A1 - Zielinska-Dabkowska, Karolina M.
A1 - Hoelker, Franz
T1 - Light pollution from illuminated bridges as a potential barrier for migrating fish-Linking measurements with a proposal for a conceptual model
JF - Basic and Applied Ecology
N2 - Illuminated bridges have become important assets to navigable aquatic systems. However, if artificial light at night (ALAN) from illuminated bridges reaches aquatic habitats, such as rivers, it can threaten the river's natural heterogeneity and alter the behavioural responses of migratory fish. Here, via a pilot study, we quantified levels of ALAN at illuminated bridges that cross a river and, propose a conceptual model to estimate its potential implications on two migrating fish species with contrasting life histories. Night-time light measurements on the river Spree in Berlin were performed continuously along a transect and in detail at seven illuminated bridges. Photometric data of the pilot study showed rapidly increased and decreased light levels at several illuminated bridges from which we derived several model illumination scenarios. These illumination scenarios and their potential effect on migrating Atlantic salmon smolts (Salmo salar) and European silver eel (Anguilla anguilla) are presented as a conceptual model, considering illuminated bridges as behavioural barriers to fish migration. ALAN's adverse effects on freshwater habitats must be better researched, understood, managed, and properly communicated to develop future sustainable lighting practices and policies that preserve riverscapes and their biodiversity.
Y1 - 2023
UR - https://www.sciencedirect.com/science/article/pii/S1439179123000658?via%3Dihub
U6 - https://doi.org/10.1016/j.baae.2023.11.001
SN - 1618-0089
VL - 74
SP - 1
EP - 12
PB - Elsevier
ER -
TY - JOUR
A1 - Vollmer, Michael
T1 - So weit das Auge trägt
JF - Physik in unserer Zeit
N2 - Sichtweiten in der Atmosphäre reichen von wenigen Metern im Nebel bis zu einigen hundert Kilometern bei extrem guten Fernsichtbedingungen. Die zugrundeliegende Physik geht vom Wahrnehmungskontrast aus. Dieser ändert sich mit der Entfernung entlang der Sichtlinie zwischen Objekt und Auge aufgrund von Lichtstreuung und Absorption an den Bestandteilen der Atmosphäre. Dazu kommt bei der Fernsicht die Refraktion, die es erlaubt, auch über den durch die Kugelform der Erde geometrisch bedingten Horizont hinaus zu sehen.
Y1 - 2023
UR - https://onlinelibrary.wiley.com/doi/pdfdirect/10.1002/piuz.202301675
U6 - https://doi.org/10.1002/piuz.202301675
SN - 1521-3943
VL - 54
IS - 5
SP - 222
EP - 230
PB - Wiley
ER -
TY - INPR
A1 - Wendzel, Steffen
A1 - Caviglione, Luca
A1 - Mazurczyk, Wojciech
A1 - Mileva, Aleksandra
A1 - Dittmann, Jana
A1 - Krätzer, Christian
A1 - Lamshöft, Kevin
A1 - Vielhauer, Claus
A1 - Hartmann, Laura
A1 - Keller, Jörg
A1 - Neubert, Tom
A1 - Zillien, Sebastian
T1 - A Generic Taxonomy for Steganography Methods
N2 - A unified understanding of terms and their applicability is essential for every scientific discipline: steganography is no exception. Being divided into several domains (for instance, text steganography, digital media steganography, and network steganography), it is crucial to provide a unified terminology as well as a taxonomy that is not limited to some specific applications or areas. A prime attempt towards a unified understanding of terms was conducted in 2015 with the introduction of a pattern-based taxonomy for network steganography. Six years later, in 2021, the first work towards a pattern-based taxonomy for steganography was proposed. However, this initial attempt still faced several shortcomings, e.g., the lack of patterns for several steganography domains (the work mainly focused on network steganography and covert channels), various terminology issues, and the need of providing a tutorial on how the taxonomy can be used during engineering and scientific tasks, including the paper-writing process.
As the consortium who published this initial 2021-study on steganography patterns, in this paper we present the first comprehensive pattern-based taxonomy tailored to fit all known domains of steganography, including smaller and emerging areas, such as filesystem steganography and cyber-physical systems steganography. Besides, to make our contribution more effective and promote the use of the taxonomy to advance research on steganography, we also provide a thorough tutorial on its utilization.
Our pattern collection is available at https://patterns.ztt.hs-worms.de.
Y1 - 2023
U6 - https://doi.org/10.36227/techrxiv.20215373.v1
ER -
TY - GEN
A1 - Stockhausen, Pablo
A1 - Johannsen, Andreas
A1 - Maurer, Robert
T1 - Machine-Learning Verfahren für eine nachhaltige Letzte-Meile-Logistik
N2 - Dieser Beitrag entwickelt ein Konzept zur praktischen Umsetzung eines Machine- Learning Verfahrens zum Lösen von Vehicle Routing Problemen im Kontext einer nachhaltigen “Letzte-Meile”-Logistik, welches durch einen Prototyp umgesetzt und getestet wurde. Der Prototyp basiert auf dem “Reinforcement Learning”-System und verwendet als Algorithmus “REINFORCE mit Baseline”. In einer Vergleichsanalyse wurde der Prototyp mit dem bekannten Vertreter Google-OR, anhand von zwei Anwendungsszenarien, verglichen. Der Prototyp überzeugt dabei in der Laufzeit und dem Automatismus. Es konnte festgestellt werden, dass eine Verwendung von Lernenden-Systemen für das Vehicle Routing Problem sich bei nur bei einem größeren Stoppvolumen und einer erweiterten IT-Infrastruktur empfiehlt.
Y1 - 2023
ER -
TY - CHAP
A1 - Stockhausen, Pablo
A1 - Johannsen, Andreas
A1 - Maurer, Robert
ED - Krupka, Daniel
ED - Federrath, Hannes
ED - Demmler, Daniel
T1 - Konzeption eines Machine-Learnings-Verfahrens zum Lösen von Green Vehicle Routing Problemen
T2 - Konferenz: Informatik 2022, Lecture Notes in Informatics (LNI), Bonn, 2022/ Konferenzband: Informatik 2022 Fachtagung vom 26.-30. September 2022, Hamburg/ Band: P-326
Y1 - 2023
SN - 978-3-88579-720-3
SP - 885
EP - 897
PB - Gesellschaft für Informatik
CY - Bonn
ER -
TY - JOUR
A1 - Braubach, Lars
A1 - Jander, Kai
T1 - 1. Introduction
JF - International Journal of Parallel, Emergent and Distributed Systems
Y1 - 2023
U6 - https://doi.org/10.1080/17445760.2023.2251386
SN - 1744-5779
VL - 38
IS - 6
SP - 459
EP - 460
PB - Taylor & Francis
ER -
TY - JOUR
A1 - Hasche, Eberhard
A1 - Karaschewski, Oliver
A1 - Creutzburg, Reiner
T1 - iPhone12 imagery in scene-referred computer graphics pipelines
JF - Electronic Imaging
N2 - With the release of the Apple iPhone 12 Pro Max in 2020, various features were integrated that make it attractive as a recording device for scene-related computer graphics pipelines. The captured Apple RAW images have a much higher dynamic range than the standard 8-bit images. Since a scene-based workflow naturally has an extended dynamic range (HDR), the Apple RAW recordings can be well integrated. To correctly integrate the iPhone 12 pro Apple RAW data into a scene-related workflow, two command-line software solutions, among others, are dcraw and rawtoaces. In this paper, we concentrate on dcraw. dcraw offers the possibility to export RAW images directly to ACES2065-1. Different images recorded under different lighting conditions are examined to determine which options for the dcraw development produce the best results. Images from five different lighting situations like D65, D60, D55, D50, and 2980K, are examined. The DNG files are developed using different methods within dcraw. The values of the recorded ColorChecker24 patches are compared to reference values derived from BabelColor [1] and ACES [2].
Y1 - 2023
U6 - https://doi.org/10.2352/EI.2023.35.3.MOBMU-350
SP - 350-1
EP - 350-14
PB - Society for Imaging Science and Technology
ER -
TY - JOUR
A1 - Jaster, Daniel
A1 - Creutzburg, Reiner
A1 - Hasche, Eberhard
T1 - A qualitative study of LiDAR technologies and their application areas
JF - Electronic Imaging
N2 - In this work, the most relevant 3D LiDAR technologies and their applications in 2022 were investigated. For this purpose, applications of LiDAR systems were classified into the typical application areas "3D modeling", "smart city", "robotics", "smart automotive" and "consumer goods". The investigation has shown that neither "mechanical" LiDAR technologies, nor so-called solid-state LiDAR technologies, nor "hybrid" LiDAR technologies can be evaluated as optimal for the typical application areas. In none of the application areas could all of the elaborated requirements be met. However, the "hybrid" LiDAR technologies such as sequential MEMS LiDAR technology and sequential flash LiDAR technology proved to be among the most suitable for most typical application areas. However, other technologies also tended to be suitable for individual typical application areas. Finally, it was found that several of the LiDAR technologies investigated are currently equally suitable for some typical application areas. To evaluate the suitability, concrete LiDAR systems - of different technologies and properties - were compared with the specific requirements of exemplary applications of an application area. The results of the investigation provide an orientation as to which LiDAR technology is promising for which application area.
Y1 - 2023
U6 - https://doi.org/10.2352/EI.2023.35.3.MOBMU-368
VL - 35
SP - 368-1
EP - 368-15
PB - Society for Imaging Science and Technology
ER -
TY - JOUR
A1 - Maleki, Maniya
A1 - Mohammadi, Mahdieh
T1 - Velocity and pressure functions of an oscillating flow in a circular Hele-Shaw cell
JF - Iranian Journal of Physics Research
N2 - In this study, we have investigated the form of velocity and pressure functions of a fluid oscillating between two parallel glass sheets that form a circular Hele-Shaw cell. The flow has been considered to be radial, incompressible and laminar. The time-dependent Navier-Stokes equation has been solved in cylindrical coordinates using Fourier transform, and the oscillating flow velocity across the thickness of the cell has been obtained at different times. The flow velocity function in the unsteady state is related to the vertical component of the coordinates in the form of parabolic functions and also to the inverse of the radial component. The time dependence appears as a simple harmonic with a frequency equal to the oscillation frequency. The velocity of the flow is maximum at the middle of the cell along its height and gradually decreases from the middle towards the top or bottom plane and reaches zero. Pressure does not depend on the height and changes logarithmically with the radius. The dependence of pressure on time is also a simple harmonic with the external frequency, but it has a phase shift with respect to the velocity.
Y1 - 2023
U6 - https://doi.org/10.47176/ijpr.22.1.81304
VL - 22
IS - 1
SP - 113
EP - 120
PB - Physics Society of Iran
ER -
TY - JOUR
A1 - Lachowski, Krzysztof
A1 - Hammermeister, Florian
A1 - Halenz, Bastian
A1 - Lieckefett, Florian
A1 - Götze, Thomas
A1 - Prill, Robert
A1 - Becker, Roland
T1 - The Patellostabilometer: A New Device for Quantification of Mediolateral Patella Displacement
JF - Sensors
N2 - Mediolateral patella displacement is of interest for diagnostics and clinically relevant
research questions. Apart from manual testing, no standardized method is currently available. Proper
quantification of patella mobility is necessary to better understand pathologies at the patellofemoral
joint. Patella mobility was assessed in 25 healthy individuals using a Patellostabilometer, a new
prototype instrument for quantification of the mediolateral patella displacement. The participants
underwent measurements of the mediolateral displacement three times using the Patellostabilome-
ter. A maximal force of 10 N was applied for patella movement. Additionally, leg length and
circumference of the knee, upper- and lower-leg were measured. Lateral patella displacement of
18.27 ± 3.76 mm (range 15.85–20.64 mm, interquartile range (IQR) of 4.79) was measured. The medial
patella displacement showed 24.47 ± 6.59 mm (range 19.29–29.76 mm, IQR of 10.47). The test–retest
measurement error was 2.32 ± 1.76 mm (IQR of 2.38 mm), with five outliers. There was greater
test–retest variability between the measurements of the medial displacement compared to the lateral
one. The test–retest variability reached 7% of the patella displacement. Other parameters provided no
significant correlations. Based on the natural patellofemoral mobility, a precise and clinically relevant
quantification of patella mobility is allowed.
Y1 - 2023
UR - https://www.mdpi.com/1424-8220/23/3/1274
U6 - https://doi.org/https://doi.org/10.3390/s23031274
IS - 23 (3)
PB - MDPI
ER -
TY - JOUR
A1 - Rizun, Nina
A1 - Revina, Aleksandra
A1 - Edelmann, Noella
T1 - Application of Text Analytics in Public Service Co-Creation: Literature Review and Research Framework
JF - DG.O 2023: The 24th Annual International Conference on Digital Government Research
N2 - The public sector faces several challenges, such as a number of external and internal demands for change, citizens' dissatisfaction and frustration with public sector organizations, that need to be addressed. An alternative to the traditional top-down development of public services is co-creation of public services. Co-creation promotes collaboration between stakeholders with the aim to create better public services and achieve public values. At the same time, data analytics has been fuelled by the availability of immense amounts of textual data. Whilst both co-creation and TA have been used in the private sector, we study existing works on the application of Text Analytics (TA) techniques on text data to support public service co-creation. We systematically review 75 of the 979 papers that focus directly or indirectly on the application of TA in the context of public service development. In our review, we analyze the TA techniques, the public service they support, public value outcomes, and the co-creation phase they are used in. Our findings indicate that the TA implementation for co-creation is still in its early stages and thus still limited. Our research framework promotes the concept and stimulates the strengthening of the role of Text Analytics techniques to support public sector organisations and their use of co-creation process. From policy-makers' and public administration managers' standpoints, our findings and the proposed research framework can be used as a guideline in developing a strategy for the designing co-created and user-centred public services.
Y1 - 2023
UR - https://dl.acm.org/doi/10.1145/3598469.3598471
U6 - https://doi.org/10.1145/3598469.3598471
SP - 12
EP - 22
PB - Association for Computing Machinery
ER -
TY - JOUR
A1 - Guterding, Daniel
T1 - Sparse Modeling Approach to the Arbitrage-Free Interpolation of Plain-Vanilla Option Prices and Implied Volatilities
JF - Risks
N2 - We present a method for the arbitrage-free interpolation of plain-vanilla option prices and implied volatilities, which is based on a system of integral equations that relates terminal density and option prices. Using a discretization of the terminal density, we write these integral equations as a system of linear equations. We show that the kernel matrix of this system is, in general, ill-conditioned, so that it cannot be solved for the discretized density using a naive approach. Instead, we construct a sparse model for the kernel matrix using singular value decomposition (SVD), which allows us not only to systematically improve the condition number of the kernel matrix, but also determines the computational effort and accuracy of our method. In order to allow for the treatment of realistic inputs that may contain arbitrage, we reformulate the system of linear equations as an optimization problem, in which the SVD-transformed density minimizes the error between the input prices and the arbitrage-free prices generated by our method. To further stabilize the method in the presence of noisy input prices or arbitrage, we apply an 𝐿1-regularization to the SVD-transformed density. Our approach, which is inspired by recent progress in theoretical physics, offers a flexible and efficient framework for the arbitrage-free interpolation of plain-vanilla option prices and implied volatilities, without the need to explicitly specify a stochastic process, expansion basis functions or any other kind of model. We demonstrate the capabilities of our method in a number of artificial and realistic test cases.
Y1 - 2023
UR - https://www.mdpi.com/2227-9091/11/5/83
U6 - https://doi.org/https://doi.org/10.3390/risks11050083
IS - 11 (5)
PB - MDPI AG
ER -
TY - JOUR
A1 - Stannarius, Ralf
A1 - Harth, Kirsten
T1 - The structure of disintegrating defect clusters in smectic C freely suspended films
JF - Soft Matter
N2 - Disclinations or disclination clusters in smectic C freely suspended films with topological charges larger than one are unstable. They disintegrate, preferably in a spatially symmetric fashion, into single defects with individual charges of +1, which is the smallest positive topological charge allowed in polar vector fields. While the opposite process of defect annihilation is well-defined by the initial defect positions, disintegration starts from a singular state and the following scenario including the emerging regular defect patterns must be selected by specific mechanisms. We analyze experimental data and compare them with a simple model where the defect clusters adiabatically pass quasi-equilibrium solutions in one-constant approximation. It is found that the defects arrange in geometrical patterns that correspond very closely to superimposed singular defect solutions, without additional director distortions. The patterns expand by affine transformations where all distances between individual defects scale with the same time-dependent scaling factor proportional to the square-root of time.
Y1 - 2023
UR - https://pubs.rsc.org/en/content/articlelanding/2023/sm/d3sm00808h
U6 - https://doi.org/https://doi.org/10.1039/d3sm00808h
IS - 19
SP - 6109
EP - 6115
PB - Royal Society of Chemistry
ER -
TY - JOUR
A1 - Xu, Han-Xiang
A1 - Shimizu, Makoto
A1 - Guterding, Daniel
A1 - Otsuki, Junya
A1 - Jeschke, Harald O.
T1 - Pressure evolution of electronic structure and magnetism in the layered van der Waals ferromagnet CrGeTe3
JF - Physical Review B
N2 - Layered van der Waals ferromagnets, which preserve their magnetic properties down to exfoliated monolayers, are fueling an abundance of fundamental research and nanoscale device demonstration. CrGeTe3 is a prime example of this class of materials. Its temperature-pressure phase diagram features an insulator-to-metal transition and a significant increase in ferromagnetic Curie-Weiss temperatures upon entering the metallic state. We use density functional theory to understand the magnetic exchange interactions in CrGeTe3 at ambient and elevated pressures. We calculate Heisenberg exchange couplings, which provide the correct ferromagnetic ground state and explain the experimentally observed pressure dependence of magnetism in CrGeTe3. Furthermore, we combine density functional theory with dynamical mean-field theory to investigate the effects of electronic correlations and the nature of the high-pressure metallic state in CrGeTe3.
Y1 - 2023
U6 - https://doi.org/https://doi.org/10.1103/PhysRevB.108.125142
IS - Vol. 108
PB - American Physical Society
ER -
TY - JOUR
A1 - Klopp, Christoph
A1 - Trittel, Torsten
A1 - Harth, Kirsten
A1 - Stannarius, Ralf
T1 - Coalescence of biphasic droplets embedded in free standing smectic A films
JF - Soft Matter
N2 - We investigate micrometer-sized flat droplets consisting of an isotropic core surrounded by a nematic rim in freely suspended smectic A liquid-crystal films. In contrast to purely isotropic droplets which are characterized by a sharp edge and no long-range interactions, the nematic fringe introduces a continuous film thickness change resulting in long-range mutual attraction of droplets. The coalescence scenario is divided in two phases. The first one consists in the fusion of the nematic regions. The second phase involves the dissolution of a thin nematic film between the two isotropic cores. The latter has many similarities with the rupture of thin liquid films between droplets coalescing in an immiscible viscous liquid.
Coalescence of biphasic droplets in free-standing smectic films is controlled in part by the rupture of a thin nematic membrane separating the isotropic droplet cores.
Y1 - 2023
UR - https://pubs.rsc.org/en/content/articlelanding/2024/sm/d3sm01549a
U6 - https://doi.org/10.1039/d3sm01549a
SN - 1744-683X
VL - 20
IS - 5
SP - 1036
EP - 1046
PB - Royal Society of Chemistry
ER -
TY - JOUR
A1 - Nagel, Michael
A1 - Schminder, Christian
ED - Erich Schmidt Verlag,
T1 - Sachbezogenes Verhandeln als Methode im Zielbildungsprozess von innovationsorientierten Public Private Partnerships.
JF - Ideen- und Innovationsmanagement
Y1 - 2023
U6 - https://doi.org/10.37307/j.2198-3151.2022.02.07
SN - 2198-3151
IS - 2
SP - 72
EP - 77
PB - Erich Schmidt Verlag GmbH & Co
ER -
TY - JOUR
A1 - Johannsen, Andreas
T1 - ERP-Einführung - Bewertung einer Standardimplementierungsmethode für SAP Business One
JF - ERP Management
Y1 - 2023
SN - 1860-6725
SP - 19
EP - 22
PB - GITO Verlag
ER -
TY - JOUR
A1 - Kuznetsov, Arthur
A1 - Frorip, Aleksandr
A1 - Sünter, Alar
A1 - Kasvand, Nensi
A1 - Korsakov, Vadim
A1 - Konoplev, Georgii
A1 - Stepanova, Oksana
A1 - Rusalepp, Linda
A1 - Anton, Dea
A1 - Püssa, Tõnu
A1 - Roasto, Mati
A1 - Abramova, Liubov
A1 - Kozin, Andrey
A1 - Toom, Lauri
A1 - Hirsch, Sören
A1 - Mukhin, Nikolay
ED - mdpi,
T1 - Fast Protein and Metabolites (Nucleotides and Nucleosides) Liquid Chromatography Technique and Chemical Sensor for the Assessment of Fish and Meat Freshness
JF - Chemosensors
N2 - Fast protein and metabolite liquid chromatography (FPLMC) was introduced years ago to enable the easy separation of high-molecular compounds such as proteins from small molecules and the identification of the low-molecular substances. In this paper, the method is applied for the rapid evaluation of freshness and monitoring the aging of animal meat and fish. A novel chromatographic sensor was developed with a deep UV LED-based photometric detection unit (255–265 nm), an original flow cuvette and registration scheme; the processing of a chromatogram with the sensor takes approximately 15 min. Strict isochronism between the elution of ATP metabolites, mainly hypoxanthine (Hx) and inosine monophosphate (IMP), and the time of maturation of meat or fish, was discovered. A new freshness index H* = [Hx]/[IMP] was introduced, which is proportional to the instrumental delay time in the FPMLC chromatograms: the H* index < 0.5 indicates the presence of inosine monophosphate (IMP) and the high quality of the meat or fish. Reasonably strong correlations were revealed between data obtained by FPMLC and total volatile basic nitrogen TVB-N (for fish) or volatile fatty acids VFA (for meat) content. Moreover, putative nucleotide salvage and an increase in the concentration of IMP were observed in fish after heat treatment using the FPMLC sensor and NMR technique.
Y1 - 2023
UR - https://www.mdpi.com/2227-9040/11/1/69
U6 - https://doi.org/10.3390/chemosensors11010069
SN - 2227-9040
IS - 1/2023 / Band 11
PB - MDPI
ER -