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 -