TY  - THES
A1  - Kelemen, Christina
T1  - Analyse des phasensprungartigen Einsetzens der Passage humaner Erythrozyten durch Mikropipetten bei kritischen Temperaturen
Y1  - 1999
N1  - Zugl.: Düsseldorf, Univ., Diss., 1999 ;
Forschungszentrum Jülich: Berichte des Forschungszentrums Jülich ; 3667
PB  - Forschungszentrum, Zentralbibliothek
CY  - Jülich
ER  - 
TY  - CHAP
A1  - Kern, Alexander
A1  - Dikta, Gerhard
T1  - Probability of damage of electrical and electronic systems due to indirect lightning flashes - investigation of data from German insurance companies
N2  - In the presented paper data collected from the field related to damage statistics of electrical and electronic apparatus in household are reported and investigated. These damages (total number approx. 74000 cases), registered by five German insurance companies in 2005 and 2006, were adviced by customers as caused by lightning overvoltages. With the use of stochastical methods it is possible, to reasses the collected data and to distinguish between cases, which are with high probability caused by lightning overvoltages, and those, which are not. If there was an indication for a direct strike, this case was excluded, so the focus was only on indirect lightning flashes, i.e. only flashes to ground near the structure and flashes to or nearby an incoming service line were investigated. The data from the field contain the location of damaged apparatus (residence of the policy holder) and the distances of the nearest cloud-to-ground stroke to the location of the damage registered by the German lightning location network BLIDS at the date of damage. The statistical data along with some complementary numerical simulations allow to verify the correspondence of the Standards rules used for IEC 62305-2 with the field data and to define some correction needs. The results could lead to a better understanding whether a damage reported to an insurance company is really caused by indirect lightning, or not.
KW  - Blitzschutz
KW  - lightning flash
Y1  - 2009
ER  - 
TY  - JOUR
A1  - Kern, Alexander
A1  - Schelthoff, Christof
A1  - Mathieu, Moritz
T1  - Detaillierte Berechnung der Einfangwirksamkeiten von Fangeinrichtungen
JF  - Elektro-Praktiker
N2  - Im Beitrag wird zunächst das Verfahren eines dynamischen elektro-geometrischen Modells vorgestellt. Dieses arbeitet im Gegensatz zum klassischen Blitzkugel-Verfahren nicht mit konstanten Radien; vielmehr wird der Radius der Blitzkugel variiert. Dabei werden ausschließlich vorhandene und in internationalen Normen anerkannte Ergebnisse, blitzphysikalische Grundlagen und Untersuchungen verwendet, und auf deren Grundlage ein numerisches Verfahren erarbeitet. Mit dem dynamischen elektro-geometrischen Modell werden dann einige Beispiele des Schutzes mit Fangstangen, die gemäß dem klassischen Blitzkugel-Verfahren nach DIN EN 62305-3 für die Schutzklassen I – II – III – IV geplant sind, untersucht. Es wird gezeigt, dass die Einfangwirksamkeiten wesentlich höher sind als in der Normenreihe DIN EN 62305 selbst angegeben. Grund dafür ist die Tatsache, dass das Blitzkugel-Verfahren sehr konservativ aufgebaut ist und dem Planer von Blitzschutzsystemen nur die möglichen Stellen für einen Einschlag aufzeigt, ohne eine Bewertung der Einschlagshäufigkeit zu liefern. Andererseits bedeutet dies jedoch, dass man mit dem klassischen Blitzkugel-Verfahren stets auf der „sicheren Seite“ liegt.
Y1  - 2012
SN  - 0013-5569
VL  - 66
IS  - 4
PB  - Huss Medien
CY  - Berlin
ER  - 
TY  - JOUR
A1  - Ketelhut, Maike
A1  - Brügge, G. M.
A1  - Göll, Fabian
A1  - Braunstein, Bjoern
A1  - Albracht, Kirsten
A1  - Abel, Dirk
T1  - Adaptive iterative learning control of an industrial robot during neuromuscular training
JF  - IFAC PapersOnLine
N2  - To prevent the reduction of muscle mass and loss of strength coming along with the human aging process, regular training with e.g. a leg press is suitable. However, the risk of training-induced injuries requires the continuous monitoring and controlling of the forces applied to the musculoskeletal system as well as the velocity along the motion trajectory and the range of motion. In this paper, an adaptive norm-optimal iterative learning control algorithm to minimize the knee joint loadings during the leg extension training with an industrial robot is proposed. The response of the algorithm is tested in simulation for patients with varus, normal and valgus alignment of the knee and compared to the results of a higher-order iterative learning control algorithm, a robust iterative learning control and a recently proposed conventional norm-optimal iterative learning control algorithm. Although significant improvements in performance are made compared to the conventional norm-optimal iterative learning control algorithm with a small learning factor, for the developed approach as well as the robust iterative learning control algorithm small steady state errors occur.
KW  - Iterative learning control
KW  - Robotic rehabilitation
KW  - Adaptive control
Y1  - 2020
U6  - https://doi.org/10.1016/j.ifacol.2020.12.741
SN  - 2405-8963
VL  - 53
IS  - 2
SP  - 16468
EP  - 16475
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - CHAP
A1  - Ketelhut, Maike
A1  - Göll, Fabian
A1  - Braunstein, Bjoern
A1  - Albracht, Kirsten
A1  - Abel, Dirk
T1  - Iterative learning control of an industrial robot for neuromuscular training
T2  - 2019 IEEE Conference on Control Technology and Applications
N2  - Effective training requires high muscle forces potentially leading to training-induced injuries. Thus, continuous monitoring and controlling of the loadings applied to the musculoskeletal system along the motion trajectory is required. In this paper, a norm-optimal iterative learning control algorithm for the robot-assisted training is developed. The algorithm aims at minimizing the external knee joint moment, which is commonly used to quantify the loading of the medial compartment. To estimate the external knee joint moment, a musculoskeletal lower extremity model is implemented in OpenSim and coupled with a model of an industrial robot and a force plate mounted at its end-effector. The algorithm is tested in simulation for patients with varus, normal and valgus alignment of the knee. The results show that the algorithm is able to minimize the external knee joint moment in all three cases and converges after less than seven iterations.
KW  - Knee
KW  - Training
KW  - Load modeling
KW  - Force
KW  - Iterative learning control
Y1  - 2019
SN  - 978-1-7281-2767-5 (ePub)
SN  - 978-1-7281-2766-8 (USB)
SN  - 978-1-7281-2768-2 (PoD)
U6  - https://doi.org/10.1109/CCTA.2019.8920659
N1  - 2019 IEEE Conference on Control Technology and Applications (CCTA) Hong Kong, China, August 19-21, 2019
PB  - IEEE
CY  - New York
ER  - 
TY  - JOUR
A1  - Ketelhut, Maike
A1  - Göll, Fabian
A1  - Braunstein, Björn
A1  - Albracht, Kirsten
A1  - Abel, Dirk
T1  - Comparison of different training algorithms for the leg extension training with an industrial robot
JF  - Current Directions in Biomedical Engineering
N2  - In the past, different training scenarios have been developed and implemented on robotic research platforms, but no systematic analysis and comparison have been done so far. This paper deals with the comparison of an isokinematic (motion with constant velocity) and an isotonic (motion against constant weight) training algorithm. Both algorithms are designed for a robotic research platform consisting of a 3D force plate and a high payload industrial robot, which allows leg extension training with arbitrary six-dimensional motion trajectories. In the isokinematic as well as the isotonic training algorithm, individual paths are defined i n C artesian s pace by sufficient s upport p oses. I n t he i sotonic t raining s cenario, the trajectory is adapted to the measured force as the robot should only move along the trajectory as long as the force applied by the user exceeds a minimum threshold. In the isotonic training scenario however, the robot’s acceleration is a function of the force applied by the user. To validate these findings, a simulative experiment with a simple linear trajectory is performed. For this purpose, the same force path is applied in both training scenarios. The results illustrate that the algorithms differ in the force dependent trajectory adaption.
KW  - Rehabilitation Technology and Prosthetics
KW  - Surgical Navigation and Robotics
Y1  - 2018
U6  - https://doi.org/10.1515/cdbme-2018-0005
SN  - 2364-5504
VL  - 4
IS  - 1
SP  - 17
EP  - 20
PB  - De Gruyter
CY  - Berlin
ER  - 
TY  - JOUR
A1  - Ketelhut, Maike
A1  - Kolditz, Melanie
A1  - Göll, Fabian
A1  - Braunstein, Bjoern
A1  - Albracht, Kirsten
A1  - Abel, Dirk
T1  - Admittance control of an industrial robot during resistance training
JF  - IFAC-PapersOnLine
N2  - Neuromuscular strength training of the leg extensor muscles plays an important role in the rehabilitation and prevention of age and wealth related diseases. In this paper, we focus on the design and implementation of a Cartesian admittance control scheme for isotonic training, i.e. leg extension and flexion against a predefined weight. For preliminary testing and validation of the designed algorithm an experimental research and development platform consisting of an 
industrial robot and a force plate mounted at its end-effector has been used. Linear, diagonal and arbitrary two-dimensional motion trajectories with different weights for the leg extension and flexion part are applied. The proposed algorithm is easily adaptable to trajectories consisting of arbitrary six-dimensional poses and allows the implementation of individualized trajectories.
KW  - Assistive technology
KW  - Rehabilitation engineering
KW  - Human-Computer interaction
KW  - Automatic control
Y1  - 2019
U6  - https://doi.org/10.1016/j.ifacol.2019.12.102
SN  - 2405-8963
N1  - 14th IFAC Symposium on Analysis, Design, and Evaluation of Human Machine Systems HMS 2019
Tallinn, Estonia, 16–91 September 2019
VL  - 52
IS  - 19
SP  - 223
EP  - 228
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - JOUR
A1  - Keusgen, M.
A1  - Jünger, M.
A1  - Knobbe, D.-T.
A1  - Kloock, Joachim P.
A1  - Schöning, Michael Josef
T1  - Entwicklung eines potentiometrischen Cyanid-Biosensors auf der Basis von EIS-Strukturen
JF  - Sensoren für zukünftige Hochtechnologien und Neuentwicklungen für die Verfahrenstechnik / 6. Dresdner Sensor-Symposium, 8. - 10. Dezember 2003, Dresden. Jörg Peter Baselt; Gerald Gerlach (Hg.)
Y1  - 2003
SN  - 3-935712-92-8
SP  - 235
EP  - 238
PB  - w.e.b.-Univ.-Verl.
CY  - Dresden
ER  - 
TY  - JOUR
A1  - Keusgen, M.
A1  - Jünger, M.
A1  - Krest, I.
A1  - Schöning, Michael Josef
T1  - Development of a biosensor specific for cysteine sulfoxides
JF  - Biosensors & Bioelectronics. 18 (2003), H. 5-6
Y1  - 2003
SN  - 0956-5663
SP  - 805
EP  - 812
ER  - 
TY  - JOUR
A1  - Keusgen, M.
A1  - Jünger, M.
A1  - Schöning, Michael Josef
T1  - Biosensoric detection of the cysteine sulphoxide alliin
JF  - Book of abstracts / ed. by J. Saneistr.
Y1  - 2002
SN  - 80-01-02576-4
N1  - Eurosensors ; (16, 2002, Praha)
SP  - 1175
EP  - 1178
PB  - Czech Technical University, Faculty of Electrical Engineering, Department of Measurement
CY  - Prague
ER  - 
TY  - JOUR
A1  - Keusgen, M.
A1  - Kloock, Joachim P.
A1  - Knobbe, D.-T.
A1  - Jünger, M.
A1  - Krest, I.
A1  - Goldbach, M.
A1  - Klein, W.
A1  - Schöning, Michael Josef
T1  - Direct determination of cyanides by potentiometric biosensors
JF  - Sensors and Actuators B. 103 (2004), H. 1-2
Y1  - 2004
SN  - 0925-4005
SP  - 380
EP  - 385
ER  - 
TY  - JOUR
A1  - Keusgen, M.
A1  - Schöning, Michael Josef
T1  - Strategies for biosensoric detection of potential drugs in nature
JF  - Biomedizinische Technik. 49 (2004), H. 2
Y1  - 2004
SN  - 0932-4666
SP  - 1004
EP  - 1005
ER  - 
TY  - JOUR
A1  - Keusgen, Michael
A1  - Jünger, Martina
A1  - Krest, Ingo
A1  - Schöning, Michael Josef
T1  - Biosensoric detection of the cysteine sulphoxide alliin
JF  - Sensors and Actuators B. 95 (2003), H. 1-3
Y1  - 2003
SN  - 0925-4005
SP  - 297
EP  - 302
ER  - 
TY  - JOUR
A1  - Keutmann, Sabine
A1  - Staat, Manfred
A1  - Laack, Walter van
T1  - Untersuchung der thermischen Auswirkung von therapeutischem Ultraschall
N2  - Zusammenfassung: In der Orthopädie zählt der therapeutische Ultraschall als Mittel zur Prävention und Therapiebegleitung. Er hat mechanische, thermische und physiko-chemische Auswirkungen auf den menschlichen Körper. Um mehr Erkenntnisse über die thermischen Auswirkungen zu erlangen, wurden Versuche an einem Hydrogel-Phantom und an Probanden durchgeführt. Dabei entstand eine signifikante Erwärmung des Gewebes, welche beim Probandenversuch an der Oberfläche und beim Hydrogelversuch in der Tiefe gemessen wurde.

Summary: In orthopaedics, therapeutic ultrasound is a tool of prevention and therapy support. It has mechanical, thermal and physico-chemical effects on the human body. Tests with a hydrogel phantom and with human probands have been performed in order to obtain more knowledge about their thermal effects. Both tests measured temperature increases in cell tissue, on the surface with the human proband test and in depth with the hydrogel phantom test.
T2  - Research about the thermal effects of therapeutic ultrasound
Y1  - 2018
SN  - 2193-5793
SN  - 2193-5785 (Druckausgabe)
VL  - 7
IS  - 10
SP  - 518
EP  - 522
PB  - Deutscher Ärzte-Verl.
CY  - Köln
ER  - 
TY  - JOUR
A1  - Khaydukova, M. M.
A1  - Zadorozhnaya, O. A.
A1  - Kirsanov, D. O.
A1  - Iken, Heiko
A1  - Rolka, David
A1  - Schöning, Michael Josef
A1  - Babain, V. A.
A1  - Vlasov, Yu. G.
A1  - Legin, A. V.
T1  - Multivariate processing of atomic-force microscopy images for detection of the response of plasticized polymeric membranes
JF  - Russian journal of applied chemistry
N2  - The possibility of using the atomic-force microscopy as a method for detection of the analytical signal from plasticized polymeric sensor membranes was analyzed. The surfaces of cadmium-selective membranes based on two polymeric matrices were examined. The digital images were processed with multivariate image analysis techniques. A correlation was found between the surface profile of an ion-selective membrane and the concentration of the ion in solution.
Y1  - 2014
U6  - https://doi.org/10.1134/S1070427214030112
SN  - 1608-3296 (E-Journal); 1070-4272 (Print)
VL  - 87
IS  - 3
SP  - 307
EP  - 314
PB  - Springer
CY  - Dordrecht
ER  - 
TY  - JOUR
A1  - Khodaverdi, M.
A1  - Chatziioannou, A. F.
A1  - Weber, S.
A1  - Ziemons, Karl
A1  - Halling, H.
A1  - Pietrzyk, U.
T1  - Investigation of different MicroCT scanner configurations by GEANT4 simulations
JF  - IEEE Transactions on Nuclear Science
N2  - This study has been performed to design the combination of the new ClearPET (ClearPET is a trademark of the Crystal Clear Collaboration), a small animal positron emission tomography (PET) system, with a micro-computed tomography (microCT) scanner. The properties of different microCT systems have been determined by simulations based on GEANT4. We will demonstrate the influence of the detector material and the X-ray spectrum on the obtained contrast. Four different detector materials (selenium, cadmium zinc telluride, cesium iodide and gadolinium oxysulfide) and two X-ray spectra (a molybdenum and a tungsten source) have been considered. The spectra have also been modified by aluminum filters of varying thickness. The contrast between different tissue types (water, air, brain, bone and fat) has been simulated by using a suitable phantom. The results indicate the possibility to improve the image contrast in microCT by an optimized combination of the X-ray source and detector material.
Y1  - 2005
SN  - 0018-9499
VL  - 52
IS  - 1
SP  - 188
EP  - 192
ER  - 
TY  - JOUR
A1  - Khodaverdi, M.
A1  - Chaziioannou, A. F.
A1  - Weber, S.
A1  - Ziemons, Karl
A1  - Halling, H.
A1  - Pietrzyk, U.
T1  - Investigation of different microCT scanner configurations by GEANT4 simulations
JF  - 2003 IEEE Nuclear Science Symposium Conference Record, Vol. 4
N2  - This study has been performed to design the combination of the new ClearPET TM (ClearPET is a trademark of the Crystal Clear Collaboration), a small animal Positron Emission Tomography (PET) system, with a microComputed Tomography (microCT) scanner. The properties of different microCT systems have been determined by simulations based on GEANT4. We demonstrate the influence of the detector material and the X-ray spectrum on the obtained contrast. Four different detector materials (selenium, cadmium zinc telluride, cesium iodide and gadolinium oxysulfide) and two X-ray spectra (a molybdenum and a tungsten source) have been considered. The spectra have also been modified by aluminum filters of varying thickness. The contrast between different tissue types (water, air, brain, bone and fat) has been simulated by using a suitable phantom. The results indicate the possibility to improve the image contrast in microCT by an optimized combination of the X-ray source and detector material.
Y1  - 2004
SN  - 1082-3654
SP  - 2989
EP  - 2993
ER  - 
TY  - JOUR
A1  - Khodaverdi, M.
A1  - Pauly, F.
A1  - Schroder, G.
A1  - Ziemons, Karl
A1  - Sievering, R.
A1  - Halling, H.
T1  - Preliminary studies of a micro-CT for a combined small animal PET/CT scanner
JF  - 2001 IEEE Nuclear Science Symposium Conference Record, Vol. 3
N2  - We are developing an X-ray computed tomography (CT) system which will be combined with a high resolution animal PET system. This permits acquisition of both molecular and anatomical images in a single machine. In particular the CT will also be utilized for the quantification of the animal PET data by providing accurate data for attenuation correction. A first prototype has been built using a commercially available plane silicon diode detector. A cone-beam reconstruction provides the images using the Feldkamp algorithm. First measurements with this system have been performed on a mouse. It could be shown that the CT setup fulfils all demands for a high quality image of the skeleton of the mouse. It is also suited for soft tissue measurements. To improve contrast and resolution and to acquire the X-ray energy further development of the system, especially the use of semiconductor detectors and iterative reconstruction algorithms are planned.
Y1  - 2002
SN  - 1082-3654
SP  - 1605
EP  - 1606
ER  - 
TY  - JOUR
A1  - Khodaverdi, M.
A1  - Weber, S.
A1  - Streun, M.
A1  - Parl, C.
A1  - Ziemons, Karl
T1  - High resolution imaging with ClearPET™ Neuro - first animal images
JF  - 2005 IEEE Nuclear Science Symposium Conference Record, Vol. 3
N2  - The ClearPET™ Neuro is the first full ring scanner within the Crystal Clear Collaboration (CCC). It consists of 80 detector modules allocated to 20 cassettes. LSO and LuYAP:Ce crystals in phoswich configuration in combination with position sensitive photomultiplier tubes are used to achieve high sensitivity and realize the acquisition of the depth of interaction (DOI) information. The complete system has been tested concerning the mechanical and electronical stability and interplay. Moreover, suitable corrections have been implemented into the reconstruction procedure to ensure high image quality. We present first results which show the successful operation of the ClearPET™ Neuro for artefact free and high resolution small animal imaging. Based on these results during the past few months the ClearPET™ Neuro System has been modified in order to optimize the performance.
Y1  - 2006
SN  - 1082-3654
SP  - 1641
EP  - 1644
ER  - 
TY  - CHAP
A1  - Kirchhof, M.
A1  - Kraft, Bodo
T1  - UML-based modeling of architectural knowledge and design
N2  - IASSE-2004 - 13th International Conference on Intelligent and Adaptive Systems and Software Engineering eds. W. Dosch, N. Debnath, pp. 245-250, ISCA, Cary, NC, 1-3 July 2004, Nice, France We introduce a UML-based model for conceptual design support in civil engineering. Therefore, we identify required extensions to standard UML. Class diagrams are used for elaborating building typespecific knowledge: Object diagrams, implicitly contained in the architect’s sketch, are validated against the defined knowledge. To enable the use of industrial, domain-specific tools, we provide an integrated conceptual design extension. The developed tool support is based on graph rewriting. With our approach architects are enabled to deal with semantic objects during early design phase, assisted by incremental consistency checks.
KW  - UML
KW  - UML
KW  - Unified Modeling Language
KW  - UML
KW  - Unified Modeling Language
Y1  - 2004
ER  - 
TY  - JOUR
A1  - Kirchhof, Michael
A1  - Kraft, Bodo
T1  - Hybrides Vorgehensmodell : Agile und klassische Methoden im Projekt passend kombinieren
JF  - ProjektMagazin
N2  - Agil ist im Trend und immer mehr Unternehmen, die ihre Projekte bisher nach klassischen Prinzipien durchführten, denken über den Einsatz agiler Methoden nach. Doch selbst wenn die Organisation bereits beide Philosophien unterstützt, gilt für ein Projekt meist die klare Vorgabe: agil oder klassisch. Es gibt aber noch einen anderen Ansatz, mit diesen "unterschiedlichen Welten" umzugehen: Und zwar die beiden Philosophien innerhalb eines Projekts zu kombinieren. Wie dies in der Praxis aussehen und gelingen kann, zeigen Dr. Michael Kirchhof und Prof. Dr. Bodo Kraft in diesem Beitrag.
Y1  - 2012
IS  - 11
SP  - 11 S.
PB  - Berleb Media
CY  - Taufkirchen
ER  - 
TY  - CHAP
A1  - Kirchhof, Michael
A1  - Kraft, Bodo
T1  - Dogmatisches „Entweder agil oder klassisch" im Projektmanagement hat ausgedient - die richtige Mischung macht's
T2  - Projekt-Sternstunden : strahlende Erfolge durch Kompetenz
Y1  - 2011
SN  - 978-3-924841-60-7
N1  - PM-Forum <28, 2011, Nürnberg> ; 
PM-Forum 2011, 28. Internationales Deutsches Projektmanagement-Forum ; Nürnberg, 25. - 26.10.2011 ; Tagungsband
SP  - 414
EP  - 425
PB  - GPM
CY  - Nürnberg
ER  - 
TY  - CHAP
A1  - Kirchner, Patrick
A1  - Henkel, H.
A1  - Näther, Niko
A1  - Spelthahn, H.
A1  - Schneider, A.
A1  - Berger, J.
A1  - Kolstad, J.
A1  - Friedrich, P.
A1  - Schöning, Michael Josef
T1  - RFID-basiertes Sensorsystem zur Realisierung intelligenter Verpackungen für die Nahrungsmittelindustrie
T2  - KMU - innovativ: IKT 2008. CD-ROM : BMBF-Statustagung KMU - innovativ: IKT, Darmstadt, 17. - 18. Nov. 2008
Y1  - 2008
IS  - CD-ROM-Ausg.
PB  - BMBF
CY  - Berlin
ER  - 
TY  - JOUR
A1  - Kirchner, Patrick
A1  - Li, B.
A1  - Spelthahn, H.
A1  - Henkel, H.
A1  - Friedrich, P.
A1  - Kolstad, J.
A1  - Keusgen, M.
A1  - Schöning, Michael Josef
T1  - Thin-film calorimetric H2O2 gas sensor for the validation of germicidal effectivity in aseptic filling processes
JF  - Procedia Chemistry. 1 (2009), H. 1
Y1  - 2009
SN  - 1876-6196
N1  - Proceedings of the Eurosensors XXIII conference ; Eurosensors 23
SP  - 983
EP  - 986
ER  - 
TY  - JOUR
A1  - Kirchner, Patrick
A1  - Li, B.
A1  - Spelthahn, H.
A1  - Henkel, H.
A1  - Schneider, A.
A1  - Kolstad, J.
A1  - Friedrich, P.
A1  - Schöning, Michael Josef
T1  - Realisierung eines miniaturisierten Gassensors in Chiptechnologie basierend auf einer Dünnschicht-Thermosäule zur H2O2-Detektion in aseptischen Abfüllanlagen
JF  - 9. Dresdner Sensor-Symposium : Dresden, 07.-09. Dezember 2009 / Gerlach, Gerald ; Hauptmann, Peter [Hrsg.]
Y1  - 2009
SN  - 978-3-941298-44-6
N1  - Dresdner Sensor-Symposium ; (9, 2009, Dresden)
SP  - 293
EP  - 296
PB  - TUDpress
CY  - Dresden
ER  - 
TY  - JOUR
A1  - Kirchner, Patrick
A1  - Li, Bin
A1  - Spelthahn, Heiko
A1  - Henkel, Hartmut
A1  - Schneider, Andreas
A1  - Friedrich, Peter
A1  - Kolstad, Jens
A1  - Keusgen, Michael
A1  - Schöning, Michael Josef
T1  - Thin-film calorimetric H2O2 gas sensor for the validation of germicidal effectivity in aseptic filling processes
JF  - Sensors and Actuators B: Chemical. 154 (2011), H. 2
Y1  - 2011
SN  - 1873-3077
N1  - EUROSENSORS XXIII
SP  - 257
EP  - 263
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - JOUR
A1  - Kirchner, Patrick
A1  - Oberländer, Jan
A1  - Friedrich, Peter
A1  - Berger, Jörg
A1  - Rysstad, Gunnar
A1  - Schöning, Michael Josef
A1  - Keusgen, Michael
T1  - Realisation of a calorimetric gas sensor on polyimide foil for applications in aseptic food industry
JF  - Sensors and Actuators B: Chemical
N2  - A calorimetric gas sensor is presented for the monitoring of vapour-phase H2O2 at elevated temperature during sterilisation processes in aseptic food industry. The sensor was built up on a flexible polyimide foil (thickness: 25 μm) that has been chosen due to its thermal stability and low thermal conductivity. The sensor set-up consists of two temperature-sensitive platinum thin-film resistances passivated by a layer of SU-8 photo resist and catalytically activated by manganese(IV) oxide. Instead of an active heating structure, the calorimetric sensor utilises the elevated temperature of the evaporated H2O2 aerosol. In an experimental test rig, the sensor has shown a sensitivity of 4.78 °C/(%, v/v) in a H2O2 concentration range of 0%, v/v to 8%, v/v. Furthermore, the sensor possesses the same, unchanged sensor signal even at varied medium temperatures between 210 °C and 270 °C of the gas stream. At flow rates of the gas stream from 8 m3/h to 12 m3/h, the sensor has shown only a slightly reduced sensitivity at a low flow rate of 8 m3/h. The sensor characterisation demonstrates the suitability of the calorimetric gas sensor for monitoring the efficiency of industrial sterilisation processes.
KW  - Sterilisation process
KW  - Hydrogen peroxide
KW  - Polyimide
KW  - Calorimetric gas sensor
Y1  - 2012
U6  - https://doi.org/10.1016/j.snb.2011.01.032
SN  - 0925-4005
N1  - Part of special issue "Eurosensors XXIV, 2010"
VL  - 170
SP  - 60
EP  - 66
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - JOUR
A1  - Kirchner, Patrick
A1  - Oberländer, Jan
A1  - Friedrich, Peter
A1  - Berger, Jörg
A1  - Suso, Henri-Pierre
A1  - Kupyna, Andriy
A1  - Keusgen, Michael
A1  - Schöning, Michael Josef
T1  - Optimisation and fabrication of a calorimetric gas sensor built up on a polyimide substrate for H2O2 monitoring
JF  - Physica status solidi (a) : applications and material science. 208 (2011), H. 6
Y1  - 2011
SN  - 1862-6319
SP  - 1235
EP  - 1240
PB  - Wiley
CY  - Weinheim
ER  - 
TY  - JOUR
A1  - Kirchner, Patrick
A1  - Oberländer, Jan
A1  - Friedrich, Peter
A1  - Rysstad, G.
A1  - Berger, J.
A1  - Keusgen, M.
A1  - Schöning, Michael Josef
T1  - Realization of a calorimetric gas sensor on polyimide foil for applications in aseptic food industry
JF  - Procedia Engineering. 5 (2010)
Y1  - 2010
SN  - 1877-7058
N1  - Eurosensor XXIV Conference
SP  - 264
EP  - 267
ER  - 
TY  - JOUR
A1  - Kirchner, Patrick
A1  - Oberländer, Jan
A1  - Suco, Henri-Pierre
A1  - Rysstad, Gunnar
A1  - Schöning, Michael Josef
T1  - Monitoring the microbicidal effectiveness of gaseous hydrogen peroxide in sterilisation processes by means of a calorimetric gas sensor
JF  - Food control
N2  - In the present work, a novel method for monitoring sterilisation processes with gaseous H2O2 in combination with heat activation by means of a specially designed calorimetric gas sensor was evaluated. Therefore, the sterilisation process was extensively studied by using test specimens inoculated with Bacillus atrophaeus spores in order to identify the most influencing process factors on its microbicidal effectiveness. Besides the contact time of the test specimens with gaseous H2O2 varied between 0.2 and 0.5 s, the present H2O2 concentration in a range from 0 to 8% v/v (volume percent) had a strong influence on the microbicidal effectiveness, whereas the change of the vaporiser temperature, gas flow and humidity were almost negligible. Furthermore, a calorimetric H2O2 gas sensor was characterised in the sterilisation process with gaseous H2O2 in a wide range of parameter settings, wherein the measurement signal has shown a linear response against the H2O2 concentration with a sensitivity of 4.75 °C/(% v/v). In a final step, a correlation model by matching the measurement signal of the gas sensor with the microbial inactivation kinetics was established that demonstrates its suitability as an efficient method for validating the microbicidal effectiveness of sterilisation processes with gaseous H2O2.
KW  - hydrogen peroxide
KW  - sterilisation
KW  - Bacillus atrophaeus
KW  - calorimetric gas sensor
Y1  - 2012
U6  - https://doi.org/10.1016/j.foodcont.2012.11.048
SN  - 0956-7135
VL  - 31
IS  - 2
SP  - 530
EP  - 538
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - JOUR
A1  - Kirchner, Patrick
A1  - Oberländer, Jan
A1  - Suso, Henri-Pierre
A1  - Rysstad, Gunnar
A1  - Keusgen, Michael
A1  - Schöning, Michael Josef
T1  - Towards a wireless sensor system for real-time H2O2 monitoring in aseptic food processes
JF  - Physica status solidi (a)
N2  - A wireless sensor system based on the industrial ZigBee standard for low-rate wireless networking was developed that enables real-time monitoring of gaseous H2O2 during the package sterilization in aseptic food processes. The sensor system consists of a remote unit connected to a calorimetric gas sensor, which was already established in former works, and an external base unit connected to a laptop computer. The remote unit was built up by an XBee radio frequency (RF) module for data communication and a programmable system-on-chip controller to read out the sensor signal and process the sensor data, whereas the base unit is a second XBee RF module. For the rapid H2O2 detection on various locations inside the package that has to be sterilized, a novel read-out strategy of the calorimetric gas sensor was established, wherein the sensor response is measured within the short sterilization time and correlated with the present H2O2 concentration. In an exemplary measurement application in an aseptic filling machinery, the suitability of the new, wireless sensor system was demonstrated, wherein the influence of the gas velocity on the H2O2 distribution inside a package was determined and verified with microbiological tests.
KW  - calorimetric gas sensor;hydrogen peroxide;wireless sensor system
Y1  - 2013
U6  - https://doi.org/10.1002/pssa.201200920
SN  - 1862-6319
VL  - 210
IS  - 5
SP  - 877
EP  - 883
PB  - Wiley
CY  - Weinheim
ER  - 
TY  - JOUR
A1  - Kirchner, Patrick
A1  - Reisert, Steffen
A1  - Pütz, Patrick
A1  - Keusgen, Michael
A1  - Schöning, Michael Josef
T1  - Characterisation of polymeric materials as passivation layer for calorimetric H2O2 gas sensors
JF  - Physica Status Solidi (a)
N2  - Calorimetric gas sensors for monitoring the H₂O₂ concentration at elevated temperatures in industrial sterilisation processes have been presented in previous works. These sensors are built up in form of a differential set-up of a catalytically active and passive temperature-sensitive structure. Although, various types of catalytically active dispersions have been studied, the passivation layer has to be established and therefore, chemically as well as physically characterised. In the present work, fluorinated ethylene propylene (FEP), perfluoralkoxy (PFA) and epoxy-based SU-8 photoresist as temperature-stable polymeric materials have been investigated for sensor passivation in terms of their chemical inertness against H₂O₂, their hygroscopic properties as well as their morphology. The polymeric materials were deposited via spin-coating on the temperature-sensitive structure, wherein spin-coated FEP and PFA show slight agglomerates. However, they possess a low absorption of humidity due to their hydrophobic surface, whereas the SU-8 layer has a closed surface but shows a slightly higher absorption of water. All of them were inert against gaseous H₂O₂ during the characterisation in H₂O₂ atmosphere that demonstrates their suitability as passivation layer for calorimetric H₂O₂ gas sensors.
Y1  - 2012
U6  - https://doi.org/10.1002/pssa.201100773
SN  - 1862-6319
VL  - 209
IS  - 5
SP  - 859
EP  - 863
PB  - Wiley-VCH
CY  - Weinheim
ER  - 
TY  - JOUR
A1  - Kirchner, Patrick
A1  - Spelthahn, H.
A1  - Schöning, Michael Josef
A1  - Henkel, H.
A1  - Schneider, A.
A1  - Friedrich, P.
A1  - Kolstad, J.
A1  - Berger, J.
T1  - Realisierung eines Polyimid-basierten kalorimetrischen Gassensors zur Inline-Überwachung der H2O2-Konzentration in aseptischen Abfüllanlagen
JF  - Sensoren und Messsysteme 2010 [Elektronische Ressource] : Vorträge der 15. ITG/GMA-Fachtagung vom 18. bis 19. Mai 2010 in Nürnberg / Informationstechnische Gesellschaft im VDE (ITG); VDI/VDE-Gesellschaft Mess- und Automatisierungstechnik (GMA)
Y1  - 2010
SN  - 978-3-8007-3260-9
N1  - Fachtagung Sensoren und Messsysteme 15, 2010, Nürnberg ; Gesellschaft Mess- und Automatisierungstechnik
SP  - 607
EP  - 612
PB  - VDE Verlag
CY  - Berlin
ER  - 
TY  - JOUR
A1  - Kleefeld, Andreas
T1  - The hot spots conjecture can be false: some numerical examples
JF  - Advances in Computational Mathematics
N2  - The hot spots conjecture is only known to be true for special geometries. This paper shows numerically that the hot spots conjecture can fail to be true for easy to construct bounded domains with one hole. The underlying eigenvalue problem for the Laplace equation with Neumann boundary condition is solved with boundary integral equations yielding a non-linear eigenvalue problem. Its discretization via the boundary element collocation method in combination with the algorithm by Beyn yields highly accurate results both for the first non-zero eigenvalue and its corresponding eigenfunction which is due to superconvergence. Additionally, it can be shown numerically that the ratio between the maximal/minimal value inside the domain and its maximal/minimal value on the boundary can be larger than 1 + 10− 3. Finally, numerical examples for easy to construct domains with up to five holes are provided which fail the hot spots conjecture as well.
KW  - Numerics
KW  - Boundary integral equations
KW  - Potential theory
KW  - Helmholtz equation
KW  - Interior Neumann eigenvalues
Y1  - 2021
U6  - https://doi.org/10.1007/s10444-021-09911-5
SN  - 1019-7168
VL  - 47
PB  - Springer
CY  - Dordrecht
ER  - 
TY  - CHAP
A1  - Kleefeld, Andreas
ED  - Constanda, Christian
T1  - Numerical calculation of interior transmission eigenvalues with mixed boundary conditions
T2  - Computational and Analytic Methods in Science and Engineering
N2  - Interior transmission eigenvalue problems for the Helmholtz equation play an important role in inverse wave scattering. Some distribution properties of those eigenvalues in the complex plane are reviewed. Further, a new scattering model for the interior transmission eigenvalue problem with mixed boundary conditions is described and an efficient algorithm for computing the interior transmission eigenvalues is proposed. Finally, extensive numerical results for a variety of two-dimensional scatterers are presented to show the validity of the proposed scheme.
Y1  - 2020
SN  - 978-3-030-48185-8 (Hardcover)
U6  - https://doi.org/10.1007/978-3-030-48186-5_9
SP  - 173
EP  - 195
PB  - Birkhäuser
CY  - Cham
ER  - 
TY  - JOUR
A1  - Kleefeld, Andreas
A1  - Pieronek, J.
T1  - Elastic transmission eigenvalues and their computation via the method of fundamental solutions
JF  - Applicable Analysis
N2  - A stabilized version of the fundamental solution method to catch ill-conditioning effects is investigated with focus on the computation of complex-valued elastic interior transmission eigenvalues in two dimensions for homogeneous and isotropic media. Its algorithm can be implemented very shortly and adopts to many similar partial differential equation-based eigenproblems as long as the underlying fundamental solution function can be easily generated. We develop a corroborative approximation analysis which also implicates new basic results for transmission eigenfunctions and present some numerical examples which together prove successful feasibility of our eigenvalue recovery approach.
KW  - elastic scattering
KW  - method of fundamental solutions
KW  - Interior transmission eigenvalues
Y1  - 2020
U6  - https://doi.org/10.1080/00036811.2020.1721473
SN  - 1563-504X
VL  - 100
IS  - 16
SP  - 3445
EP  - 3462
PB  - Taylore & Francis
CY  - London
ER  - 
TY  - JOUR
A1  - Kleefeld, Andreas
A1  - Reißel, Martin
T1  - The Levenberg–Marquardt method applied to a parameter estimation problem arising from electrical resistivity tomography
JF  - Applied Mathematics and Computation
Y1  - 2011
SN  - 0096-3003
VL  - 217
IS  - 9
SP  - 4490
EP  - 4501
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - JOUR
A1  - Kleefeld, Andreas
A1  - Zimmermann, M.
ED  - Constanda, Christian
ED  - Bodmann, Bardo E.J.
ED  - Harris, Paul J.
T1  - Computing Elastic Interior Transmission Eigenvalues
JF  - Integral Methods in Science and Engineering
N2  - An alternative method is presented to numerically compute interior elastic transmission eigenvalues for various domains in two dimensions. This is achieved by discretizing the resulting system of boundary integral equations in combination with a nonlinear eigenvalue solver. Numerical results are given to show that this new approach can provide better results than the finite element method when dealing with general domains.
Y1  - 2022
SN  - 978-3-031-07171-3
U6  - https://doi.org/10.1007/978-3-031-07171-3_10
N1  - Corresponding author: Andreas Kleefeld
SP  - 139
EP  - 155
PB  - Birkhäuser
CY  - Cham
ER  - 
TY  - JOUR
A1  - Kleines, H.
A1  - Erki, I.
A1  - Ziemons, Karl
A1  - Zwoll, K.
ED  - Lehmann, Thomas
T1  - ATM- und Multimedia Pilotsystem im Rahmen des Projektes M-FIBRe Aufbau und Erfahrungen
JF  - Bildverarbeitung für die Medizin : Algorithmen - Systeme - Anwendungen
Y1  - 1997
SN  - 3-86073-519-5
N1  - Proceedings des Aachener Workshops am 8. u. 9. November 1996 ; PP_001 Posterpräsentation
SP  - 241
EP  - 248
PB  - Verl. der. Augustinus-Buchh.
CY  - Aachen
ER  - 
TY  - JOUR
A1  - Kloock, Joachim P.
A1  - Moreno, Lia
A1  - Bratov, A.
A1  - Huachupoma, S.
A1  - Xu, J.
A1  - Wagner, Torsten
A1  - Yoshinobu, T.
A1  - Ermolenko, Y.
A1  - Vlasov, Y. G.
A1  - Schöning, Michael Josef
T1  - PLD-prepared cadmium sensors based on chalcogenide glasses —ISFET, LAPS and &#956;ISE semiconductor structures
JF  - Sensors and Actuators B: Chemical. 118 (2006), H. 1-2
Y1  - 2006
SN  - 0925-4005
N1  - Eurosensors XIX - Eurosensors XIX - The 19th European Conference on Solid-State Transducers
SP  - 149
EP  - 155
ER  - 
TY  - CHAP
A1  - Kloock, Joachim P.
A1  - Moreno, Lia
A1  - Huachupoma, S.
A1  - Xu, J.
A1  - Wagner, Torsten
A1  - Bratov, A.
A1  - Doll, T.
A1  - Vlasov, Y.
A1  - Schöning, Michael Josef
ED  - Gerlach, Gerald
T1  - Halbleiterbasierte Schwermetallsensorik auf der Basis von Chalkogenidgläsern für zukünftige „Lab on Chip“-Anwendungen
T2  - 7. Dresdner Sensor-Symposium - Neue Herausforderungen und Anwendungen in der Sensortechnik
Y1  - 2005
SN  - 3-938863-29-3
SP  - 221
EP  - 224
PB  - TUDpress, Verl. der Wissenschaften
CY  - Dresden
ER  - 
TY  - JOUR
A1  - Kloock, Joachim P.
A1  - Mourzina, Y.
A1  - Schubert, J.
A1  - Ermelenko, Y.
A1  - Schöning, Michael Josef
T1  - Pulsed laser deposition: A tool for fabricating thin-film microsensors
JF  - Biomedizinische Technik. 49 (2004), H. 2
Y1  - 2004
SN  - 0932-4666
SP  - 1032
EP  - 1033
ER  - 
TY  - JOUR
A1  - Kloock, Joachim P.
A1  - Mourzina, Y.G.
A1  - Ermolenko, Y.
A1  - Doll, T.
A1  - Schubert, J.
A1  - Schöning, Michael Josef
T1  - Inorganic thin-film sensor membranes with PLD-prepared chalcogenide glasses: Challenges and implementation
JF  - Sensors. 4 (2004), H. 10
Y1  - 2004
SN  - 1424-8220
SP  - 156
EP  - 162
ER  - 
TY  - JOUR
A1  - Kloock, Joachim P.
A1  - Mourzina, Y.G.
A1  - Yoshinobu, T.
A1  - Schubert, J.
A1  - Schöning, Michael Josef
T1  - Chalkogenidglassensoren für die Schwermetallanalytik
JF  - Sensoren und Mess-Systeme : Vorträge der 11. ITG/GMA-Fachtagung vom 11. bis 12. März 2002 in Ludwigsburg / Veranst.: Informationstechnische Gesellschaft im VDE (ITG) ... Wiss. Tagungsleitung: C. D. Kohl ....
Y1  - 2002
SN  - 3-8007-2675-0
N1  - Sensoren und Mess-Systeme 2002
SP  - 395
EP  - 398
PB  - VDE-Verl.
CY  - Berlin [u.a.]
ER  - 
TY  - JOUR
A1  - Kloock, Joachim P.
A1  - Poghossian, Arshak
A1  - Schumacher, K.
A1  - Rosenkranz, C.
A1  - Schultze, J. W.
A1  - Müller-Veggian, Mattea
A1  - Schöning, Michael Josef
T1  - Funktionsprüfung und Charakterisierung von ionensensitiven Feldeffekttransistoren (ISFETs) auf Waferebene mittels Mikrotropfenzelle für den zukünftigen Einsatz in der Sensorproduktion
JF  - Sensoren und Messsysteme 2006 : Vorträge der 13. ITG/GMA-Fachtagung vom 13. bis 14. März 2006 in Freiburg/Breisgau / Veranst.: Informationstechnische Gesellschaft im VDE (ITG) ; VDE/VDI-Gesellschaft Mess- und Automatisierungstechnik (GMA). Wiss. Tagungsleitung: L. M. Reindl
Y1  - 2006
SN  - 3-8007-2939-3
N1  - Fachtagung Sensoren und Messsysteme <13, 2006, Freiburg, Breisgau>
SP  - 257
EP  - 260
PB  - VDE-Verl.
CY  - Berlin
ER  - 
TY  - CHAP
A1  - Kloock, Joachim P.
A1  - Schubert, J.
A1  - Ermelenko, Y.
A1  - Vlasov, Y. G.
A1  - Bratov, A.
A1  - Schöning, Michael Josef
T1  - Thin-film sensors with chalcogenide glass materials – a general survey
T2  - Biochemical sensing utilisation of micro- and nanotechnologies : Warsaw, [23rd - 26th] November 2005 / ed. by M. Mascini ...
Y1  - 2006
SP  - 92
EP  - 97
CY  - Warsaw
ER  - 
TY  - CHAP
A1  - Kloock, Joachim P.
A1  - Schöning, Michael Josef
T1  - Heavy metal detection with semiconductor devices based on PLD-prepared chalcogenide glass thin films
T2  - Armenian Journal of Physics
Y1  - 2007
SN  - 1829-1171
SP  - 95
EP  - 98
ER  - 
TY  - CHAP
A1  - Klöser, Lars
A1  - Büsgen, André
A1  - Kohl, Philipp
A1  - Kraft, Bodo
A1  - Zündorf, Albert
ED  - Conte, Donatello
ED  - Fred, Ana
ED  - Gusikhin, Oleg
ED  - Sansone, Carlo
T1  - Explaining relation classification models with semantic extents
T2  - Deep Learning Theory and Applications
N2  - In recent years, the development of large pretrained language models, such as BERT and GPT, significantly improved information extraction systems on various tasks, including relation classification. State-of-the-art systems are highly accurate on scientific benchmarks. A lack of explainability is currently a complicating factor in many real-world applications. Comprehensible systems are necessary to prevent biased, counterintuitive, or harmful decisions.

We introduce semantic extents, a concept to analyze decision patterns for the relation classification task. Semantic extents are the most influential parts of texts concerning classification decisions. Our definition allows similar procedures to determine semantic extents for humans and models. We provide an annotation tool and a software framework to determine semantic extents for humans and models conveniently and reproducibly. Comparing both reveals that models tend to learn shortcut patterns from data. These patterns are hard to detect with current interpretability methods, such as input reductions. Our approach can help detect and eliminate spurious decision patterns during model development. Semantic extents can increase the reliability and security of natural language processing systems. Semantic extents are an essential step in enabling applications in critical areas like healthcare or finance. Moreover, our work opens new research directions for developing methods to explain deep learning models.
KW  - Relation classification
KW  - Natural language processing
KW  - Natural language understanding
KW  - Information extraction
KW  - Trustworthy artificial intelligence
Y1  - 2023
SN  - 978-3-031-39058-6 (Print)
SN  - 978-3-031-39059-3 (Online)
U6  - https://doi.org/10.1007/978-3-031-39059-3_13
N1  - 4th International Conference, DeLTA 2023, Rome, Italy, July 13–14, 2023.
SP  - 189
EP  - 208
PB  - Springer
CY  - Cham
ER  - 
TY  - CHAP
A1  - Klöser, Lars
A1  - Kohl, Philipp
A1  - Kraft, Bodo
A1  - Zündorf, Albert
T1  - Multi-attribute relation extraction (MARE): simplifying the application of relation extraction
T2  - Proceedings of the 2nd International Conference on Deep Learning Theory and Applications DeLTA - Volume 1
N2  - Natural language understanding’s relation extraction makes innovative and encouraging novel business concepts possible and facilitates new digitilized decision-making processes. Current approaches allow the extraction of relations with a fixed number of entities as attributes. Extracting relations with an arbitrary amount of attributes requires complex systems and costly relation-trigger annotations to assist these systems. We introduce multi-attribute relation extraction (MARE) as an assumption-less problem formulation with two approaches, facilitating an explicit mapping from business use cases to the data annotations. Avoiding elaborated annotation constraints simplifies the application of relation extraction approaches. The evaluation compares our models to current state-of-the-art event extraction and binary relation extraction methods. Our approaches show improvement compared to these on the extraction of general multi-attribute relations.
Y1  - 2021
SN  - 978-989-758-526-5
U6  - https://doi.org/10.5220/0010559201480156
N1  - 2nd International Conference on Deep Learning Theory and Applications, DeLTA2021, July 7-9, 2021
SP  - 148
EP  - 156
PB  - SciTePress
CY  - Setúbal
ER  - 
TY  - JOUR
A1  - Knobbe, D.-T.
A1  - Schöning, Michael Josef
A1  - Poghossian, Arshak
A1  - Mourzina, Y.
T1  - Charakterisierung von kapazitiven EMISSensoren mittels Impedanzspektroskopie, Kapazitäts-Spannungs- und Konstant-Kapazitäts-Messung
JF  - Sensoren und Messsysteme 2004 : Tagung Ludwigsburg, 15. und 16. März 2004 / VDI-VDE-Gesellschaft Mess- und Automatisierungstechnik
Y1  - 2004
SN  - 3-18-091829-2
N1  - Auch erschienen als: VDI-Berichte ; 1829
SP  - 851
EP  - 854
PB  - VDI
CY  - Düsseldorf
ER  -