TY - CHAP
A1 - Platonov, R. A.
A1 - Altynnikov, A. G.
A1 - Mikhailov, A. K.
A1 - Yastrebov, A. V.
A1 - Mukhin, N. V.
A1 - Hirsch, Sören
A1 - Kozyrev, A. B.
T1 - Tunable impedance microwave matching of laser diodes
T2 - Konferenz: 2017 Progress In Electromagnetics Research Symposium - Spring (PIERS)/ Titel: 2017 Progress In Electromagnetics Research Symposium - Spring (PIERS)
Y1 - 2017
UR - http://ieeexplore.ieee.org/document/8261920/
SN - 978-1-5090-6269-0
U6 - https://doi.org/10.1109/PIERS.2017.8261920
SP - 1152
EP - 1157
PB - IEEE
CY - St Petersburg, Russia
ER -
TY - CHAP
A1 - Neubert, Tom
A1 - Hildebrandt, Mario
A1 - Dittmann, Jana
T1 - Image pre-processing detection: Evaluation of Benford's law, spatial and frequency domain feature performance
T2 - Konferenz: 2016 First International Workshop on Sensing, Processing and Learning for Intelligent Machines (SPLINE)/ Titel: 2016 First International Workshop on Sensing, Processing and Learning for Intelligent Machines (SPLINE)
N2 - This Paper proposes a novel method for the blind detection of image pre-processing techniques by means of statistical pattern recognition in image forensics. The technique is intended to detect sensor intrinsic pre-processing steps as well as manually applied filters. We have exemplary chosen 6 pre-processing filters with different parameter settings. The concept utilizes 29 image features which are supposed to allow for a reliable model creation during supervised learning. The evaluation of the trained models indicates average accuracies between 82.50 and 94.53%. The investigation of image data from 8 sensors leads to the detection of credible pre-processing filters. Those results adumbrate that our method might be suitable to prove the authenticity of the data origin and the integrity of image data based on the detected preprocessing techniques. The preliminary evaluation for manually applied filters yields recognition accuracies between 39.09% (14 classes) and 53.33% (7 classes).
Y1 - 2016
UR - http://ieeexplore.ieee.org/document/7528405/
SN - 978-1-4673-8917-4
U6 - https://doi.org/10.1109/SPLIM.2016.7528405
SP - 1
EP - 5
PB - IEEE
CY - Aalborg, Denmark
ER -
TY - JOUR
A1 - Lucklum, Ralf
A1 - Zubtsov, Mikhail
A1 - Oseev, Aleksandr
A1 - Schmidt, Marc-Peter
A1 - Hirsch, Sören
T1 - SAW Based Sandwich Phononic Crystal Sensor
JF - Procedia Engineering
N2 - Sensing is nowadays an accepted application of phononic crystals with chemical and biosensors for liquid analytes being the perhaps most promising ones. A liquid-filled defect is introduced that turns into a resonant cavity. Similar to the well-known resonant sensors sensitivity can be increased with higher operating frequencies. We introduce a Sandwiched Phononic Crystal (SPC), which applies a resonant cavity located between two stacked layers on top of a SAW device. Key challenges are coupling of surface acoustic wave into the liquid cavities and avoiding scattering of the guided waves into the bulk of the sensor chip.
Y1 - 2016
UR - https://linkinghub.elsevier.com/retrieve/pii/S1877705816335640
U6 - https://doi.org/10.1016/j.proeng.2016.11.251
SN - 18777058
IS - 168
SP - 700
EP - 703
PB - Elsevier
ER -
TY - JOUR
A1 - Schmidt, Marc-Peter
A1 - Oseev, Aleksandr
A1 - Lucklum, Ralf
A1 - Zubtsov, Mikhail
A1 - Hirsch, Sören
T1 - SAW based phononic crystal sensor, technological challenges and solutions
JF - Microsystem Technologies
Y1 - 2016
UR - http://link.springer.com/10.1007/s00542-015-2781-3
U6 - https://doi.org/10.1007/s00542-015-2781-3
SN - 0946-7076, 1432-1858
SP - 1593
EP - 1599
PB - Springer Link
ER -
TY - CHAP
A1 - Schmidt, Marc-Peter
A1 - Oseev, Aleksandr
A1 - Lucklum, Ralf
A1 - Zubtsov, Mikhail
A1 - Hirsch, Sören
T1 - SAW based phononic crystal liquid sensor - Periodic microfluidic channels approach
T2 - Konferenz: 2016 IEEE International Ultrasonics Symposium (IUS)/ Titel:2016 IEEE International Ultrasonics Symposium (IUS)
N2 - Phononic crystals (PnC) with a specifically designed liquid-filled defect have been recently introduced as a novel sensor platform (Lucklum et al. in Sens Actuators B Chem 171–172:271–277, 2012). Sensors based on this principle feature a band gap covering the typical input span of the measurand as well as a narrow transmission peak within the band gap where the frequency of maximum transmission is governed by the measurand. This approach has been applied for determination of volumetric properties of liquids (Lucklum et al. in Sens Actuators B Chem 171–172:271–277, 2012; Oseev et al. in Sens Actuators B Chem 189:208–212, 2013; Lucklum and Li in Meas Sci Technol 20(12):124014, 2009) and has demonstrated attractive sensitivity. One way to improve sensitivity requires higher probing frequencies in the range of 100 MHz and above. In this range surface acoustic wave (SAW) devices are an established basis for sensors. We have performed first tests towards a PnC microsensors (Lucklum et al. in Towards a SAW based phononic crystal sensor platform. In: 2013 Joint European frequency and time forum and international frequency control symposium (EFTF/IFC), pp 69–72, 2013). The respective feature size of the PnC SAW sensor has dimensions in the range of 10 µm and below. Whereas those dimensions are state of the art for common MEMS materials, etching of holes and cavities in piezoelectric materials that have an aspect ratio diameter/depth is still challenging. In this contribution we describe an improved technological process able to realize considerably deep and uniform holes in a SAW substrate.
Y1 - 2016
UR - http://ieeexplore.ieee.org/document/7728788/
SN - 978-1-4673-9897-8
U6 - https://doi.org/10.1109/ULTSYM.2016.7728788
SP - 1
EP - 4
PB - IEEE
CY - Tours, France
ER -
TY - CHAP
A1 - Fomina, Marina A.
A1 - Koshuro, Vladimir A.
A1 - Fomin, Aleksandr A.
A1 - Rodionov, Igor V.
A1 - Skaptsov, Aleksandr A.
A1 - Zakharevich, Andrey M.
A1 - Aman, Alexander
A1 - Oseev, Aleksandr
A1 - Hirsch, Sören
A1 - Majcherek, Soeren
ED - Tuchin, Valery V.
ED - Derbov, Vladimir L.
ED - Postnov, Dmitry E.
ED - Meglinski, Igor V.
ED - Larin, Kirill V.
ED - Pravdin, Alexander B.
ED - Genina, Elina A.
T1 - Peculiarities of structure formation of layered metal-oxide system Ti-Ta-(Ti,Ta) x O y during electro-spark alloying and thermally stimulated modification
T2 - Konferenz: Saratov, Russian Federation/ Titel: PROCEEDINGS VOLUME 9917 SARATOV FALL MEETING 2015 | 22-25 SEPTEMBER 2015 Saratov Fall Meeting 2015: Third International Symposium on Optics and Biophotonics and Seventh Finnish-Russian Photonics and Laser Symposium (PALS)
N2 - The study focuses on high-performance combined electro-spark alloying of titanium and titanium alloy (VT1-0, VT16) surface and porous matrix structure oxidation. The metal-oxide coatings morphology is the result of melt drop transfer, heat treatment, and oxidation. The study establishes the influence of technological regimes of alloying and oxidation on morphological heterogeneity of biocompatible layered metal-oxide system Ti-Ta-(Ti,Ta)xOy. It was found that during electro-spark alloying the concentration of tantalum on the titanium surface ranges from 0.1 to 3.2 at.%. Morphology of the deposited splats is represented by uniformly grown crystals of titanium and tantalum oxides, which increase from nano- to submicron size.
Y1 - 2016
UR - http://proceedings.spiedigitallibrary.org/proceeding.aspx?doi=10.1117/12.2229491
U6 - https://doi.org/10.1117/12.2229491
PB - SPIE. Digital Library
CY - Saratov, Russian Federation
ER -
TY - CHAP
A1 - Neubert, Tom
A1 - Kraetzer, Christian
A1 - Dittmann, Jana
T1 - A Face Morphing Detection Concept with a Frequency and a Spatial Domain Feature Space for Images on eMRTD
T2 - Konferenz: IH&MMSec '19: ACM Information Hiding and Multimedia Security Workshop; Paris, France; July 3-5, 2019/ Titel: Proceedings of the ACM Workshop on Information Hiding and Multimedia Security
N2 - Since the face morphing attack was introduced by Ferrara et al. in 2014, the detection of face morphings has become a wide spread topic in image forensics. By now, the community is very active and has reported diverse detection approaches. So far, the evaluations are mostly performed on images without post-processing. Face images stored within electronic machine readable documents (eMRTD) are ICAO-passport-scaled to a resolution of 413x531 and a JPG or JP2 lesize of 15 kilobytes. This paper introduces a face morphing detection concept with 3 modules (ICAO-aligned pre- processing module, feature extraction module and classi cation module), tailored for such images on eMRTD. In this work we exemplary design and evaluate two feature spaces for the feature extraction module, a frequency domain and a spatial domain feature space. Our evaluation will compare both feature spaces and is carried out with 66,229 passport-scaled images (64,363 morphed face images and 1,866 authentic face images) which are completly independent from training and include all images provided for the IHMMSEC'19 special session: "Media Forensics - Fake or Real?". Furthermore, we investigate the in uence of di erent morph gen- eration pipelines to the detection accuracies of the concept and we analyse the impact of neutral and smiling genuine faces to the morph detector performance. The evaluation determines a detection rate of 86.0% for passport-scaled morphed images with a false alarm rate of 4.4% for genuine images for the spatial domain feature space.
Y1 - 2019
UR - https://dl.acm.org/doi/10.1145/3335203.3335721
SN - 978-1-4503-6821-6
U6 - https://doi.org/10.1145/3335203.3335721
SP - 95
EP - 100
PB - ACM
ER -
TY - CHAP
A1 - Orlowski, Katja
A1 - Tiersch, Alexander
A1 - L'Orteye, Annett
A1 - Tetzlaff, Laura
A1 - Mrkor, Kai-Uwe
A1 - Schrader, Thomas
T1 - Sensorbasierte Bestimmung von Parametern zur objectiven Betrachtung des Algorithmus "Return to Activity"
T2 - Konferenz: 19. Frühjahsschule (FJS), 2019/ Titel: Technologien im Leistungssport 3 - Tagungsband zur 19. Frühjahrsschule am 14./15. Mai 2018 in Leipzig
Y1 - 2018
SN - 978-3-8403-7628-3 978-3-8403-1290-8
U6 - https://doi.org/10.5771/9783840312908
N1 - Teil der Schriftenreihe für angewandte Trainingswissenschaft
SP - 94
EP - 105
PB - Meyer & Meyer
CY - Leipzig, Germany
ER -
TY - CHAP
A1 - Makrushin, Andrey
A1 - Kraetzer, Christian
A1 - Neubert, Tom
A1 - Dittmann, Jana
T1 - Generalized Benford's Law for Blind Detection of Morphed Face Images
T2 - Konferenz: IH&MMSec '18: 6th ACM Workshop on Information Hiding and Multimedia Security, 2018/ Titel: Proceedings of the 6th ACM Workshop on Information Hiding and Multimedia Security
Y1 - 2018
UR - https://dl.acm.org/doi/10.1145/3206004.3206018
SN - 978-1-4503-5625-1
U6 - https://doi.org/10.1145/3206004.3206018
SP - 49
EP - 54
PB - ACM
CY - Innsbruck Austria
ER -
TY - JOUR
A1 - Neubert, Tom
A1 - Makrushin, Andrey
A1 - Hildebrandt, Mario
A1 - Kraetzer, Christian
A1 - Dittmann, Jana
T1 - Extended StirTrace benchmarking of biometric and forensic qualities of morphed face images
JF - IET Biometrics
N2 - Since its introduction in 2014, the face morphing forgery (FMF) attack has received significant attention from the biometric and media forensic research communities. The attack aims at creating artificially weakened templates which can be successfully matched against multiple persons. If successful, the attack has an immense impact on many biometric authentication scenarios including the application of electronic machine-readable travel document (eMRTD) at automated border control gates. We extend the StirTrace framework for benchmarking FMF attacks by adding five issues: a novel three-fold definition for the quality of morphed images, a novel FMF realisation (combined morphing), a post-processing operation to simulate the digital image format used in eMRTD (passport scaling 15 kB), an automated face recognition system (VGG face descriptor) as additional means for biometric quality assessment and two feature spaces for FMF detection (keypoint features and fusion of keypoint and Benford features) as additional means for forensic quality assessment. We show that the impact of StirTrace post-processing operations on the biometric quality of morphed face images is negligible except for two noise operators and passport scaling 15 kB, the impact on the forensic quality depends on the type of post-processing, and the new FMF realisation outperforms the previously considered ones.
Y1 - 2018
UR - https://onlinelibrary.wiley.com/doi/10.1049/iet-bmt.2017.0147
U6 - https://doi.org/10.1049/iet-bmt.2017.0147
SN - 2047-4938, 2047-4946
IS - Augabe: 4/ Band: 7
SP - 325
EP - 332
PB - Wiley
ER -
TY - CHAP
A1 - Neubert, Tom
A1 - Kraetzer, Christian
A1 - Dittmann, Jana
T1 - Reducing the False Alarm Rate for Face Morph Detection by a Morph Pipeline Footprint Detector
T2 - Konferenz: 2018 26th European Signal Processing Conference (EUSIPCO), 2018/ Titel: 2018 26th European Signal Processing Conference (EUSIPCO)
Y1 - 2018
UR - https://ieeexplore.ieee.org/document/8553067/
SN - 978-90-827970-1-5
U6 - https://doi.org/10.23919/EUSIPCO.2018.8553067
SP - 1002
EP - 1006
PB - IEEE
CY - Rome
ER -
TY - CHAP
A1 - Makrushin, Andrey
A1 - Neubert, Tom
A1 - Dittmann, Jana
T1 - Automatic Generation and Detection of Visually Faultless Facial Morphs
T2 - Konferenz: International Conference on Computer Vision Theory and Applications, 2017/ Titel: Proceedings of the 12th International Joint Conference on Computer Vision, Imaging and Computer Graphics Theory and Applications
N2 - This paper introduces an approach to automatic generation of visually faultless facial morphs along with a proposal on how such morphs can be automatically detected. It is endeavored that the created morphs cannot be recognized as such with the naked eye and a reference automatic face recognition (AFR) system produces high similarity scores while matching a morph against faces of persons who participated in morphing. Automatic generation of morphs allows for creating abundant experimental data, which is essential (i) for evaluating the performance of AFR systems to reject morphs and (ii) for training forensic systems to detect morphs. Our first experiment shows that human performance to distinguish between morphed and genuine face images is close to random guessing. In our second experiment, the reference AFR system has verified 11.78% of morphs against any of genuine images at the decision threshold of 1% false acceptance rate. These results indicate that facial morphing is a serious threat to access control systems aided by AFR and establish the need for morph detection approaches. Our third experiment shows that the distribution of Benford features extracted from quantized DCT coefficients of JPEG-compressed morphs is substantially different from that of genuine images enabling the automatic detection of morphs.
Y1 - 2017
UR - http://www.scitepress.org/DigitalLibrary/Link.aspx?doi=10.5220/0006131100390050
SN - 978-989-758-225-7 978-989-758-226-4 978-989-758-227-1
U6 - https://doi.org/10.5220/0006131100390050
SP - 39
EP - 50
PB - SCITEPRESS - Science and Technology Publications
CY - Porto, Portugal
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 - 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 - 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 - RPRT
A1 - Wrobel, Martin
A1 - Nicolai, Alexander
T1 - Digitale Innovation im Mittelstand: Fallbeispiele erfolgreicher Digitalisierungsprojekte
Y1 - 2019
UR - https://www.researchgate.net/publication/332351222_Digitale_Innovation_im_Mittelstand_Fallbeispiele_erfolgreicher_Digitalisierungsprojekte
ER -
TY - CHAP
A1 - Benning, Axel
A1 - Wilms, Andreas
T1 - Informationen generieren, Kompetenzen sichtbar machen und bewerten
T2 - Anrechnung an Hochschulen: Organisation – Durchführung – Qualitätssicherung. Hochschulrektorenkonferenz – Projekt nexus, Dezember 2017
Y1 - 2019
SN - 978-3-942600-67-5
SP - 9
EP - 11
PB - Hochschullektorenkoferenz
CY - Berlin
ET - 2.
ER -
TY - JOUR
A1 - Vollmer, Michael
A1 - Mustard, Alexander
T1 - Blue - the color of (pure) water
JF - Physics Education
N2 - Water can exhibit many different colors due to a variety of physical properties. Here, we focus on some observable colors within very pure freshwater. We only treat the absorption of light due to electronic and ro-vibrational excitations and scattering due to refractive index fluctuations of the water and the respective consequences for the appearance of colors.
Y1 - 2019
UR - https://iopscience.iop.org/article/10.1088/1361-6552/ab130a
U6 - https://doi.org/10.1088/1361-6552/ab130a
SN - 0031-9120 (print) 1361-6552 (online)
IS - Ausgabe: 4/ Band: 54
PB - IOP Publishing
ER -
TY - JOUR
A1 - Vollmer, Michael
T1 - The freezing of lakes in winter
JF - European Journal of Physics
N2 - Freezing of lakes is described using a simplified one-dimensional model, which gives ice thickness, ice growth rates, and ice surface temperature as a function of time. Model data for a specific lake with known meteorological conditions are compared to estimated ice thickness using a simple optical method. Finally, more advanced potential students projects are briefly discussed and results of a numerical solution are compared to the simplified model.
Y1 - 2019
UR - https://iopscience.iop.org/article/10.1088/1361-6404/ab07f8
U6 - https://doi.org/10.1088/1361-6404/ab07f8
SN - 1367-2630
IS - Ausgabe: 3/ Band: 40
PB - IOP Publishing
ER -
TY - CHAP
A1 - Seibold, Clemens
A1 - Hilsmann, Anna
A1 - Makrushin, Andrey
A1 - Kraetzer, Christian
A1 - Neubert, Tom
A1 - Dittmann, Jana
A1 - Eisert, Peter
T1 - Visual Feature Space Analyses of Face Morphing Detectors
T2 - Konferenz: 2019 IEEE International Workshop on Information Forensics and Security (WIFS), Delft, Netherlands, 2019/ Konferenztitel: 2019 IEEE International Workshop on Information Forensics and Security (WIFS)
Y1 - 2019
UR - https://ieeexplore.ieee.org/document/9034983/
SN - 978-1-72813-217-4
U6 - https://doi.org/10.1109/WIFS47025.2019.9034983
SP - 1
EP - 6
PB - IEEE
CY - Delft, Netherlands
ER -