@inproceedings{Daryusi, author = {Daryusi, Ali}, title = {FEM-Analyse an St{\"a}ben mit Halbkreisnut und {\"u}berlagerter Querbohrung zur {\"U}berpr{\"u}fung des Thum'schen Verfahrens}, series = {Interdisziplin{\"a}re Produktentwicklung : 15. Gemeinsames Kolloquium Konstruktionstechnik 2017 : 5. und 6. Oktober in Duisburg : Modellbasierte Ans{\"a}tze in der Produktentwicklung, konstruktionsbegleitende Berechnung und Simulation, Virtualit{\"a}t in der Produktentwicklung, Absicherung der Produktmodelldatenqualit{\"a}t, Wissensmanagement in Engineering-Prozessen}, publisher = {Universit{\"a}t Duisburg-Essen}, address = {Duisburg}, isbn = {978-3-940402-15-8}, doi = {10.17185/duepublico/44616}, pages = {69 -- 76}, language = {de} } @inproceedings{VauderwangeWozniakJavahiralyetal., author = {Vauderwange, Oliver and Wozniak, Peter and Javahiraly, Nicolas and Curticapean, Dan}, title = {A blended learning concept for an engineering course in the field of color representation and display technologies}, series = {SPIE Conference Proceedings SPIE Optical Engineering + Applications, 2016, San Diego, California, United States}, organization = {SPIE}, doi = {10.1117/12.2237612}, pages = {9}, abstract = {The Paper presents the design and development of a blended learning concept for an engineering course in the field of color representation and display technologies. A suitable learning environment is crucial for the success of the teaching scenario. A mixture of theoretical lectures and hands-on activities with practical applications and experiments, combined with the advantages of modern digital media is the main topic of the paper. Blended learning describes the didactical change of attendance periods and online periods. The e-learning environment for the online period is designed toward an easy access and interaction. Present digital media extends the established teaching scenarios and enables the presentation of videos, animations and augmented reality (AR). Visualizations are effective tools to impart learning contents with lasting effect. The preparation and evaluation of the theoretical lectures and the hands-on activities are stimulated and affects positively the attendance periods. The tasks and experiments require the students to work independently and to develop individual solution strategies. This engages and motivates the students, deepens the knowledge. The authors will present their experience with the implemented blended learning scenario in this field of optics and photonics. All aspects of the learning environment will be introduced.}, language = {en} } @inproceedings{HeinkeEchleHoerthetal., author = {Heinke, Matthias and Echle, Reinhard and H{\"o}rth, Johannes and Kr{\"a}mer, Martin}, title = {Simulation of Electrical Fields in Cardiac Resynchronization Therapy and Temperature Spread in HF Ablation}, series = {SAJ Biotechnology}, volume = {4}, number = {1}, issn = {2375-6713}, pages = {6}, abstract = {Background: The electrical field (E-field) of the biventricular (BV) stimulation is important for the success of cardiac resynchronization therapy (CRT) in patients with cardiac insufficiency and widened QRS complex. The 3D modeling allows the simulation of CRT and high frequency (HF) ablation. Purpose: The aim of the study was to model different pacing and ablation electrodes and to integrate them into a heart model for the static and dynamic simulation of atrial and BV stimulation and high frequency (HF) ablation in atrial fibrillation (AF). Methods: The modeling and simulation was carried out using the electromagnetic simulation software CST (CST Darmstadt). Five multipolar left ventricular (LV) electrodes, one epicardial LV electrode, four bipolar right atrial (RA) electrodes, two right ventricular (RV) electrodes and one HF ablation catheter were modeled. Selected electrodes were integrated into the Offenburg heart rhythm model for the electrical field simulation. The simulation of an AV node ablation at CRT was performed with RA, RV and LV electrodes and integrated ablation catheter with an 8 mm gold tip. Results: The right atrial stimulation was performed with an amplitude of 1.5 V with a pulse width of 0.5. The far-field potentials generated by the atrial stimulation were perceived by the right and left ventricular electrode. The far-field potential at a distance of 1 mm from the right ventricular electrode tip was 36.1 mV. The far-field potential at a distance of 1 mm from the left ventricular electrode tip was measured with 37.1 mV. The RV and LV stimulation were performed simultaneously at amplitude of 3 V at the LV electrode and 1 V at the RV electrode with a pulse width of 0.5 ms each. The far-field potentials generated by the BV stimulations could be perceived by the RA electrode. The far-field potential at the RA electrode tip was 32.86 mV. AV node ablation was simulated with an applied power of 5 W at 420 kHz and 10 W at 500 kHz at the distal 8 mm ablation electrode. Conclusions: Virtual heart and electrode models as well as the simulations of electrical fields and temperature profiles allow the static and dynamic simulation of atrial synchronous BV stimulation and HF ablation at AF. The 3D simulation of the electrical field and temperature profile may be used to optimize the CRT and AF ablation.}, language = {en} } @inproceedings{daCostaFernandesSchmidtFeldmannetal., author = {da Costa Fernandes, Jesus Salazar and Schmidt, Michael and Feldmann, Thomas and Bollin, Elmar}, title = {Use of load profiles to optimize microgrids of non-residential environments}, series = {33rd EU PVSEC Conference Proceedings}, address = {M{\"u}nchen}, organization = {WIP Munich}, isbn = {3-936338-47-7}, issn = {2196-100X}, doi = {10.4229/EUPVSEC20172017-6BV.3.90}, pages = {2739 -- 2746}, abstract = {Three real-lab trigeneration microgrids are investigated in non-residential environments (educational, office/administrational, companies/production) with a special focus on domain-specific load characteristics. For accurate load forecasting on such a local level, {\`a} priori information on scheduled events have been combined with statistical insight from historical load data (capturing information on not explicitly-known consumer behavior). The load forecasts are then used as data input for (predictive) energy management systems that are implemented in the trigeneration microgrids. In real-world applications, these energy management systems must especially be able to carry out a number of safety and maintenance operations on components such as the battery (e.g. gassing) or CHP unit (e.g. regular test runs). Therefore, energy management systems should combine heuristics with advanced predictive optimization methods. Reducing the effort in IT infrastructure the main and safety relevant management process steps are done on site using a Smart \& Local Energy Controller (SLEC) assisted by locally measured signals or operator given information as default and external inputs for any advanced optimization. Heuristic aspects for local fine adjustment of energy flows are presented.}, language = {en} } @inproceedings{daCostaFernandes, author = {da Costa Fernandes, Jesus Salazar}, title = {Forecast based energy optimization for solar photovoltaic and hybrid energy systems}, series = {29th EUPVSEC Conference Proceedings}, publisher = {WIP}, address = {M{\"u}nchen}, organization = {WIP Munich}, isbn = {3-936338-34-5}, issn = {2196-100X}, doi = {10.4229/EUPVSEC20142014-6AV.4.6}, pages = {3648 -- 3653}, abstract = {A former remote area power supply was converted to a smart cogeneration subnet with combined heat and power to develop and validate a forecast based energy management at the University of Applied Sciences in Offenburg/Germany. Locally processed weather forecasts and forecasted demand profiles are integrated to allow a precise reaction to changes of fluctuating power sources, changes in scheduled demand profiles and to improve the energy efficiency of the supply. The management of the electrical and thermal storages is influenced by the forecasted energy contributions and the forecasted demand. Further approaches should improve the accuracy of forecasting algorithms and integrate parameter models gained of a detailed monitoring to realize predictive controllers.}, language = {en} } @inproceedings{KraemerHeinkeEchleetal., author = {Kr{\"a}mer, Martin and Heinke, Matthias and Echle, Reinhard and H{\"o}rth, Johannes}, title = {Simulation of Electrical Fields in Cardiac Resynchronization Therapy and Temperature Spread in HF Ablation}, series = {Biomedical Engineering / Biomedizinische Technik}, volume = {62}, number = {S1}, publisher = {Walter de Gruyter}, address = {Berlin, Boston}, issn = {1862-278X (Online)}, doi = {10.1515/bmt-2017-5032}, pages = {S155}, abstract = {The electrical field (E-field) of the biventricular (BV) stimulation is important for the success of cardiac resynchronization therapy (CRT) in patients with cardiac insufficiency and widened QRS complex. The aim of the study was to model different pacing and ablation electrodes and to integrate them into a heart model for the static and dynamic simulation of BV stimulation and HF ablation in atrial fibrillation (AF). The modeling and simulation was carried out using the electromagnetic simulation software CST. Five multipolar left ventricular (LV) electrodes, four bipolar right atrial (RA) electrodes, two right ventricular (RV) electrodes and one HF ablation catheter were modelled. A selection were integrated into the heart rhythm model (Schalk, Offenburg) for the electrical field simulation. The simulation of an AV node ablation at CRT was performed with RA, RV and LV electrodes and integrated ablation catheter with an 8 mm gold tip. The BV stimulation were performed simultaneously at amplitude of 3 V at the LV electrode and 1 V at the RV electrode with a pulse width of 0.5 ms each. The far-field potential at the RA electrode tip was 32.86 mV and 185.97 mV at a distance of 1 mm from the RA electrode tip. AV node ablation was simulated with an applied power of 5 W at 420 kHz at the distal ablation electrode. The temperature at the catheter tip was 103.87 °C after 5 s ablation time and 37.61 °C at a distance of 2 mm inside the myocardium. After 15 s, the temperature was 118.42 °C and 42.13 °C. Virtual heart and electrode models as well as the simulations of electrical fields and temperature profiles allow the static and dynamic simulation of atrial synchronous BV stimulation and HF ablation at AF and could be used to optimize the CRT and AF ablation.}, language = {en} } @inproceedings{TumamposHeinkeHoerth, author = {Tumampos, Jonas and Heinke, Matthias and H{\"o}rth, Johannes}, title = {Spectral analysis of signal averaging electrocardiography in atrial and ventricular tachyarrhythmias}, series = {Biomedical Engineering / Biomedizinische Technik}, volume = {62}, number = {S1}, publisher = {Walter de Gruyter}, address = {Berlin, Boston}, issn = {1862-278X (Online)}, doi = {10.1515/bmt-2017-5071}, pages = {S366}, abstract = {Background: Targeting complex fractionated atrial electrograms detected by automated algorithms during ablation of persistent atrial fibrillation has produced conflicting outcomes in previous electrophysiological studies. The aim of the investigation was to evaluate atrial and ventricular high frequency fractionated electrical signals with signal averaging technique. Methods: Signal averaging electrocardiography (ECG) allows high resolution ECG technique to eliminate interference noise signals in the recorded ECG. The algorithm uses automatic ECG trigger function for signal averaged transthoracic, transesophageal and intracardiac ECG signals with novel LabVIEW software (National Instruments, Austin, Texas, USA). For spectral analysis we used fast fourier transformation in combination with spectro-temporal mapping and wavelet transformation for evaluation of detailed information about the frequency and intensity of high frequency atrial and ventricular signals. Results: Spectral-temporal mapping and wavelet transformation of the signal averaged ECG allowed the evaluation of high frequency fractionated atrial signals in patients with atrial fibrillation and high frequency ventricular signals in patients with ventricular tachycardia. The analysis in the time domain evaluated fractionated atrial signals at the end of the signal averaged P-wave and fractionated ventricular signals at the end of the QRS complex. The analysis in the frequency domain evaluated high frequency fractionated atrial signals during the P-wave and high frequency fractionated ventricular signals during QRS complex. The combination of analysis in the time and frequency domain allowed the evaluation of fractionated signals during atrial and ventricular conduction. Conclusions: Spectral analysis of signal averaging electrocardiography with novel LabVIEW software can utilized to evaluate atrial and ventricular conduction delays in patients with atrial fibrillation and ventricular tachycardia. Complex fractionated atrial electrograms may be useful parameters to evaluate electrical cardiac arrhythmogenic signals in atrial fibrillation ablation.}, language = {en} } @inproceedings{KatliarFrisonFischer, author = {Katliar, Mikhail and Frison, Gianluca and Fischer, J{\"o}rg}, title = {Nonlinear Model Predictive Control of a Cable-Robot-Based Motion Simulator}, series = {IFAC-PapersOnLine. 20th IFAC World Congress}, volume = {50}, number = {1}, publisher = {Elsevier}, address = {Amsterdam}, issn = {1474-6670}, doi = {10.1016/j.ifacol.2017.08.901}, pages = {9833 -- 9839}, abstract = {In this paper we present the implementation of a model-predictive controller (MPC) for real-time control of a cable-robot-based motion simulator. The controller computes control inputs such that desired acceleration and rotational velocity at a de� ned point in simulator's cabin are tracked while satisfying constraints due to working space and allowed cable forces of the robot. The tracking performance and computation time of the algorithm are investigated in computer simulations. Furthermore, for motion simulation scenarios where the reference trajectories are not known beforehand, we derive an estimate on how much motion simulation � delity can maximally be improved by any reference prediction scheme compared to the case when no prediction scheme is applied.}, language = {en} } @inproceedings{HenselMarinovGanev, author = {Hensel, Stefan and Marinov, Marin B. and Ganev, Borislav}, title = {Performance evaluation of low-cost particulate matter sensors}, series = {2017 XXVI International Scientific Conference Electronics (ET)}, publisher = {IEEE}, doi = {10.1109/ET.2017.8124367}, pages = {1 -- 4}, abstract = {The need to measure basic aerosol parameters has increased dramatically in the last decade. This is due mainly to their harmful effect on the environment and on public health. Legislation requires that particle emissions and ambient levels, workplace particle concentrations and exposure to them are measured to confirm that the defined limits are met and the public is not exposed to harmful concentrations of aerosols.}, language = {en} } @inproceedings{HenselMarinov, author = {Hensel, Stefan and Marinov, Marin B.}, title = {Sensor data fusion for topological localization of rail vehicles}, series = {Proceedings of the 7th FDIBA Conference}, publisher = {Fakult{\"a}t f{\"u}r deutsche Ingenieur- und Betriebswirtschaftsausbildung (FDIBA), Technical University of Sofia}, address = {Sofia}, issn = {2535-132X}, pages = {41 -- 44}, language = {en} } @inproceedings{HenselMarinov, author = {Hensel, Stefan and Marinov, Marin B.}, title = {Estimation of Magnetic Field Maps With Mobile Platforms}, series = {Proceedings of the 7th FDIBA Conference}, publisher = {Fakult{\"a}t f{\"u}r deutsche Ingenieur- und Betriebswirtschaftsausbildung (FDIBA), Technical University of Sofia}, address = {Sofia}, issn = {2535-132X}, pages = {93 -- 96}, language = {en} } @inproceedings{SikoraAhmadPashaetal., author = {Sikora, Axel and Ahmad, Zahoor and Pasha, Muhammad Adeel and Ahmad, Awais and Abubakr, Muhammad and Masud, Shahid and Schappacher, Manuel}, title = {Performance Evaluation of IEEE 802.15.4-Compliant Smart Water Meters for Automating Large-Scale Waterways}, series = {Proceedings of the 2017 IEEE 9th International Conference on Intelligent Data Acquisition and Advanced Computing Systems: Technology and Applications (IDAACS)}, volume = {2}, organization = {IEEE}, isbn = {978-1-5386-0697-1 (digital)}, doi = {10.1109/IDAACS.2017.8095189}, pages = {746 -- 751}, abstract = {Climate change and resultant scarcity of water are becoming major challenges for countries around the world. With the advent of Wireless Sensor Networks (WSN) in the last decade and a relatively new concept of Internet of Things (IoT), embedded systems developers are now working on designing control and automation systems that are lower in cost and more sustainable than the existing telemetry systems for monitoring. The Indus river basin in Pakistan has one of the world's largest irrigation systems and it is extremely challenging to design a low-cost embedded system for monitoring and control of waterways that can last for decades. In this paper, we present a hardware design and performance evaluation of a smart water metering solution that is IEEE 802.15.4-compliant. The results show that our hardware design is as powerful as the reference design, but allows for additional flexibility both in hardware and in firmware. The indigenously designed solution has a power added efficiency (PAE) of 24.7\% that is expected to last for 351 and 814 days for nodes with and without a power amplifier (PA). Similarly, the results show that a broadband communication (434 MHz) over more than 3km can be supported, which is an important stepping stone for designing a complete coverage solution of large-scale waterways.}, language = {en} } @inproceedings{SikoraAhmadPashaetal., author = {Sikora, Axel and Ahmad, Awais and Pasha, Muhammad Adeel and Ahmad, Zahoor and Masud, Shahid}, title = {Energy Efficient Sensor Network Routing (EESNR) Protocol For Large Distributed Environmental Monitoring Applications}, series = {Proceedings of the 2017 IEEE 9th International Conference on Intelligent Data Acquisition and Advanced Computing Systems: Technology and Applications (IDAACS)}, volume = {2}, organization = {IEEE}, isbn = {978-1-5386-0697-1 (digital)}, doi = {10.1109/IDAACS.2017.8095188}, pages = {740 -- 745}, abstract = {Due to climate change and scarcity of water reservoirs, monitoring and control of irrigation systems is now becoming a major focal area for researchers in Cyber-Physical Systems (CPS). Wireless Sensor Networks (WSNs) are rapidly finding their way in the field of irrigation and play the key role as data gathering technology in the domain of IoT and CPS. They are efficient for reliable monitoring, giving farmers an edge to take precautionary measures. However, designing an energy-efficient WSN system requires a cross-layer effort and energy-aware routing protocols play a vital role in the overall energy optimization of a WSN. In this paper, we propose a new hierarchical routing protocol suitable for large area environmental monitoring such as large-scale irrigation network existing in the Punjab province of Pakistan. The proposed protocol resolves the issues faced by traditional multi-hop routing protocols such as LEACH, M-LEACH and I-LEACH, and enhances the lifespan of each WSN node that results in an increased lifespan of the whole network. We used the open-source NS3 simulator for simulation purposes and results indicate that our proposed modifications result in an average 27.8\% increase in lifespan of the overall WSN when compared to the existing protocols.}, language = {en} } @inproceedings{SikoraWalz, author = {Sikora, Axel and Walz, Andreas}, title = {eTPL: An Enhanced Version of the TLS Presentation Language Suitable for Automated Parser Generation}, series = {Proceedings of the 2017 IEEE 9th International Conference on Intelligent Data Acquisition and Advanced Computing Systems: Technology and Applications (IDAACS)}, volume = {2}, organization = {IEEE}, isbn = {978-1-5386-0697-1 (digital)}, doi = {10.1109/IDAACS.2017.8095200}, pages = {810 -- 814}, abstract = {The specification of the Transport Layer Security (TLS) protocol defines its own presentation language used for the purpose of semi-formally describing the structure and on-the-wire format of TLS protocol messages. This TLS Presentation Language (TPL) is more expressive and concise than natural language or tabular descriptions, but as a result of its limited objective has a number of deficiencies. We present eTPL, an enhanced version of TPL that improves its expressiveness, flexibility, and applicability to non-TLS scenarios. We first define a generic model that describes the parsing of binary data. Based on this, we propose language constructs for TPL that capture important information which would otherwise have to be picked manually from informal protocol descriptions. Finally, we briefly introduce our software tool etpl-tool which reads eTPL definitions and automatically generates corresponding message parsers in C++. We see our work as a contribution supporting sniffing, debugging, and rapid-prototyping of wired and wireless communication systems.}, language = {en} } @inproceedings{SikoraSchappacherZimmermannetal.2017, author = {Sikora, Axel and Schappacher, Manuel and Zimmermann, Lukas and Mars, Nidhal}, title = {Development of Thread-compatible Open Source Stack}, series = {Journal of Physics: Conference Series}, volume = {870}, publisher = {IOP Publishing Ltd}, issn = {1742-6588 (Print)}, doi = {10.1088/1742-6596/870/1/012001}, pages = {012001}, year = {2017}, abstract = {The Thread protocol is a recent development based on 6LoWPAN (IPv6 over IEEE 802.15.4), but with extensions regarding a more media independent approach, which - additionally - also promises true interoperability. To evaluate and analyse the operation of a Thread network a given open source 6LoWPAN stack for embedded devices (emb::6) has been extended in order to comply with the Thread specification. The implementation covers Mesh Link Establishment (MLE) and network layer functionality as well as 6LoWPAN mesh under routing mechanism based on MAC short addresses. The development has been verified on a virtualization platform and allows dynamical establishment of network topologies based on Thread's partitioning algorithm.}, language = {en} } @inproceedings{SikoraSchappacherNsiah, author = {Sikora, Axel and Schappacher, Manuel and Nsiah, Kofi Atta}, title = {Dynamic mapping of EDDL device descriptions to OPC UA}, series = {Journal of Physics: Conference Series}, volume = {870}, publisher = {IOP Publishing Ltd}, issn = {1742-6588 (Print)}, doi = {10.1088/1742-6596/870/1/012006}, pages = {012006}, abstract = {OPC UA (Open Platform Communications Unified Architecture) is already a well-known concept used widely in the automation industry. In the area of factory automation, OPC UA models the underlying field devices such as sensors and actuators in an OPC UA server to allow connecting OPC UA clients to access device-specific information via a standardized information model. One of the requirements of the OPC UA server to represent field device data using its information model is to have advanced knowledge about the properties of the field devices in the form of device descriptions. The international standard IEC 61804 specifies EDDL (Electronic Device Description Language) as a generic language for describing the properties of field devices. In this paper, the authors describe a possibility to dynamically map and integrate field device descriptions based on EDDL into OPCUA.}, language = {en} } @inproceedings{SikoraMamoRathfelder, author = {Sikora, Axel and Mamo, Fesseha Tsegaye and Rathfelder, Christoph}, title = {Legacy to Industry 4.0: A Profibus Sniffer}, series = {Journal of Physics: Conference Series}, volume = {870}, publisher = {IOP Publishing}, issn = {1742-6588 (Print)}, doi = {10.1088/1742-6596/870/1/012002}, pages = {012002}, abstract = {Legacy industrial communication protocols are proved robust and functional. During the last decades, the industry has invented completely new or advanced versions of the legacy communication solutions. However, even with the high adoption rate of these new solutions, still the majority industry applications run on legacy, mostly fieldbus related technologies. Profibus is one of those technologies that still keep on growing in the market, albeit a slow in market growth in recent years. A retrofit technology that would enable these technologies to connect to the Internet of Things, utilize the ever growing potential of data analysis, predictive maintenance or cloud-based application, while at the same time not changing a running system is fundamental.}, language = {en} } @inproceedings{SikoraMoschevikinLunkovetal., author = {Sikora, Axel and Moschevikin, Alex and Lunkov, Pavel V. and Fedorov, Alexander and Maslennikov, Evgeny I.}, title = {Hardware and Software Architecture of Multi MEMS Sensor Inertial Module}, series = {24th Saint Petersburg International Conference on Integrated Navigation Systems (ICINS), 29-31 May 2017, St. Petersburg, Russia}, organization = {IEEE}, isbn = {978-1-5386-0978-1}, doi = {10.23919/ICINS.2017.7995643}, pages = {366 -- 369}, abstract = {The paper describes the hardware and software architecture of the developed multi MEMS sensor prototype module, consisting of ARM Cortex M4 STM32F446 microcontroller unit, five 9-axis inertial measurement units MPU9255 (3D accelerometer, 3D gyroscope, 3D magnetometer and temperature sensor) and a BMP280 barometer. The module is also equipped with WiFi wireless interface (Espressif ESP8266 chip). The module is constructed in the form of a truncated pyramid. Inertial sensors are mounted on a special basement at different angles to each other to eliminate hardware sensors drifts and to provide the capability for self-calibration. The module fuses information obtained from all types of inertial sensors (acceleration, rotation rate, magnetic field and air pressure) in order to calculate orientation and trajectory. It might be used as an Inertial Measurement Unit, Vertical Reference Unit or Attitude and Heading Reference System.}, language = {en} } @inproceedings{SikoraSchwaabReginyaetal., author = {Sikora, Axel and Schwaab, Manuel and Reginya, Sergey and Abramov, Evgeniy V.}, title = {Measurement Analysis of Multiple MEMS Sensor Array}, series = {24th Saint Petersburg International Conference on Integrated Navigation Systems (ICINS), 29-31 May 2017, St. Petersburg, Russia}, organization = {IEEE}, isbn = {978-1-5386-0978-1}, doi = {10.23919/ICINS.2017.7995650}, pages = {392 -- 395}, abstract = {The low cost and small size of MEMS inertial sensors allows their combination into a multi sensor module in order to improve performance. However the different linear accelerations measured on different places on a rotating rigid body have to be considered for the proper fusion of the measurements. The errors in measurement of MEMS inertial sensors include deterministic imperfection, but also random noise. The gain in accuracy of using multiple sensors depends strongly on the correlation between these errors from the different sensors. Although for sensor fusion it usually assumed that the measurement errors of different sensors are uncorrelated, estimation theory shows that for the combination of the same type of sensors actually a negative correlation will be more beneficial. Therefore we describe some important and often neglected considerations for the combination of several sensors and also present some preliminary results with regard to the correlation of measurements from a simple multi sensor setup.}, language = {en} } @inproceedings{SchnekenburgerScharffenbergWuelkeretal., author = {Schnekenburger, Fabian and Scharffenberg, Manuel and W{\"u}lker, Michael and Hochberg, Ulrich and Dorer, Klaus}, title = {Detection and Localization of Features on a Soccer Field with Feedforward Fully Convolutional Neural Networks (FCNN) for the Adult-Size Humanoid Robot Sweaty}, series = {Proceedings of the 12th Workshop on Humanoid Soccer Robots, 17th IEEE-RAS International Conference on Humanoid Robots}, address = {Birmingham}, organization = {IEEE}, url = {http://nbn-resolving.de/urn:nbn:de:bsz:ofb1-opus4-26557}, pages = {6}, abstract = {For the RoboCup Soccer AdultSize League the humanoid robot Sweaty uses a single fully convolutional neural network to detect and localize the ball, opponents and other features on the field of play. This neural network can be trained from scratch in a few hours and is able to perform in real-time within the constraints of computational resources available on the robot. The time it takes to precess an image is approximately 11 ms. Balls and goal posts are recalled in 99 \% of all cases (94.5 \% for all objects) accompanied by a false detection rate of 1.2 \% (5.2 \% for all). The object detection and localization helped Sweaty to become finalist for the RoboCup 2017 in Nagoya.}, language = {en} } @inproceedings{ScharffenbergSchnekenburgerWuelkeretal., author = {Scharffenberg, Manuel and Schnekenburger, Fabian and W{\"u}lker, Michael and Hochberg, Ulrich and Jahn, Nils-Malte and Dorer, Klaus}, title = {A New Motor Controller for Overloading BLDC-Motors of Low Inductivity, Lightweight and Ready for Admittance and Impedance Model Predictive Control}, series = {Proceedings of the 12th Workshop on Humanoid Soccer Robots, 17th IEEE-RAS International Conference on Humanoid Robots}, address = {Birmingham}, organization = {IEEE}, url = {http://nbn-resolving.de/urn:nbn:de:bsz:ofb1-opus4-26563}, pages = {6}, abstract = {One of the challenges in humanoid robotics is motion control. Interacting with humans requires impedance control algorithms, as well as tackling the problem of the closed kinematic chains which occur when both feet touch the ground. However, pure impedance control for totally autonomous robots is difficult to realize, as this algorithm needs very precise sensors for force and speed of the actuated parts, as well as very high sampling rates for the controller input signals. Both requirements lead to a complex and heavy weight design, which makes up for heavy machines unusable in RoboCup Soccer competitions. A lightweight motor controller was developed that can be used for admittance and impedance control as well as for model predictive control algorithms to further improve the gait of the robot.}, language = {en} } @inproceedings{MayurWeissharBessler, author = {Mayur, Manik and Weißhar, Bj{\"o}rn and Bessler, Wolfgang G.}, title = {Simulation-based degradation assessment of lithium-ion batteries in a hybrid electric vehicle}, series = {68th Annual Meeting of the International Society of Electrochemistry, Providence, USA (09/2017) : Book of Abstracts}, pages = {854}, abstract = {The insufficient lifetime of lithium-ion batteries is one of the major cost driver for mobile applications. The battery pack in vehicles is one of the most expensive single components that practically must be excluded from premature replacement (i.e., before the life span of the other components end). Battery degradation is a complex physicochemical process that strongly depends on operating condition and environment. We present a simulation-based analysis of lithium-ion battery degradation during operation with a standard PHEV test cycle. We use detailed multiphysics (extended Newman-type) cell models that allow the assessment of local electrochemical potential, species and temperature distributions as driving forces for degradation, including solid electrolyte interphase (SEI) formation [1]. Fig. 1 shows an exemplary test cycle and the predicted resulting spatially-averaged SEI formation rate. We apply a time-upscaling approach to extrapolate the degradation analysis over long time scales, keeping physical accuracy while allowing end-of-life assessment [2]. Results are presented for lithium-ion battery cells with graphite/LFP chemistry. The behavior of these cells in terms of degradation propensity, performance, state of charge and other internal states is predicted during long-term cycling. State of health (SOH) is quantified as capacity fade and internal resistance increase as function of operation time.}, language = {en} } @inproceedings{MayurGrueblBessler, author = {Mayur, Manik and Gr{\"u}bl, Daniel and Bessler, Wolfgang G.}, title = {Two-dimensional modeling and analysis of mass transfer losses in a Li-air button cell for different electrolytes}, series = {68th Annual Meeting of the International Society of Electrochemistry, Providence, USA (09/2017) : Book of Abstracts}, pages = {231}, abstract = {Practical bottlenecks associated with commercialization of Lithium-air cells include capacity limitation and low cycling efficiency. The origin of such losses can be traced to complex electrochemical side reactions and reactant mass transport losses[1]. The efforts to minimize such losses include exploration of various electrolytes with additives[2], and cell component geometry and material design. Given the wide range of options for such materials, it is almost impractical to experimentally setup and characterize all those cells. Consequently, modeling and simulation studies are efficient alternatives to analyze spatially and temporally resolved cell behavior for various combinations of materials[3]. In this study, with the help of a two-dimensional multi physics model, we have focused on the effect of electrode and electrolyte interaction (electrochemistry), choice of electrolyte (species transport), and electrode geometry (electrode design) on the performance of a lithium-air button cell. Figure1a shows the schematics of the 2D axisymmetric computational domain. A comparative analysis of five different electrolytes was performed while focusing on the 2D distribution of local current density and the concentration of electro-chemically active species in the cell, that is, O2and Li+. Using two different cathode configurations, namely, flooded electrode and gas diffusion electrode (GDE)[4] at different cathode thickness, the effect of cell geometry and electrolyte saturation on cell performance was explored. Further, a detailed discussion on electrode volume utilization (cf. Figure1b) is presented via changes in the active volume of cathode that produces 90\% of the total current with the cell current density for different combinations of electrolyte saturations and cathode thickness.}, language = {en} } @inproceedings{BesslerWeisshar, author = {Bessler, Wolfgang G. and Weißhar, Bj{\"o}rn}, title = {Simulation-based degradation assessment of lithium-ion batteries in a hybrid electric vehicle}, series = {14th Symposium on Fuel Cell and Battery Modelling and Experimental Validation (ModVal 14), Karlsruhe, Germany (03/2017), Book of Abstracts}, address = {Karlsruhe}, pages = {120}, language = {en} } @inproceedings{HallWusslerBuqaetal., author = {Hall, Florian and Wußler, Sabine and Buqa, Hilmi and Bessler, Wolfgang G.}, title = {Thermal and cycling behavior of an LTO/NCA lithium-ion pouch cell}, series = {14th Symposium on Fuel Cell and Battery Modelling and Experimental Validation (ModVal 14), Karlsruhe, Germany (03/2017), Book of Abstracts}, address = {Karlsruhe}, pages = {117}, language = {en} } @inproceedings{SikoraSchappacherYushevetal., author = {Sikora, Axel and Schappacher, Manuel and Yushev, Artem and Moni, Mahbuba}, title = {VTENN - A Virtualized Testbed for Embedded Networking Nodes}, series = {Proceedings of the 2017 IEEE 9th International Conference on Intelligent Data Acquisition and Advanced Computing Systems: Technology and Applications (IDAACS)}, volume = {2}, organization = {IEEE}, isbn = {978-1-5386-0697-1 (digital)}, doi = {10.1109/IDAACS.2017.8095198}, pages = {797 -- 803}, abstract = {A novel approach of a test environment for embedded networking nodes has been conceptualized and implemented. Its basis is the use of virtual nodes in a PC environment, where each node executes the original embedded code. Different nodes run in parallel, connected via so-called virtual channels. The environment allows to modifying the behavior of the virtual channels as well as the overall topology during runtime to virtualize real-life networking scenarios. The presented approach is very efficient and allows a simple description of test cases without the need of a network simulator. Furthermore, it speeds up the process of developing new features as well as it supports the identification of bugs in wireless communication stacks. In combination with powerful test execution systems, it is possible to create a continuous development and integration flow.}, language = {en} } @inproceedings{KraemerEchleHeinke, author = {Kr{\"a}mer, Martin and Echle, Reinhard and Heinke, Matthias}, title = {Simulation of Electrical Fields in Cardiac Resynchronization Therapy and Temperature Spread in HF Ablation}, series = {EP Europace}, volume = {19}, number = {Suppl. 3}, issn = {1099-5129 (Print)}, doi = {10.1093/ehjci/eux151.106}, pages = {iii185 -- iii186}, abstract = {Background: The electrical field (E-field) of the biventricular (BV) stimulation is essential for the success of cardiac resynchronization therapy (CRT) in patients with cardiac insufficiency and widened QRS complex. 3D modeling allows the simulation of CRT and high frequency (HF) ablation. Purpose: The aim of the study was to model different pacing and ablation electrodes and to integrate them into a heart model for the static and dynamic simulation of BV stimulation and HF ablation in atrial fibrillation (AF). Methods: The modeling and simulation was carried out using the electromagnetic simulation software. Five multipolar left ventricular (LV) electrodes, one epicardial LV electrode, four bipolar right atrial (RA) electrodes, two right ventricular (RV) electrodes and one HF ablation catheter were modeled. Different models of electrodes were integrated into a heart rhythm model for the electrical field simulation (fig.1). The simulation of an AV node ablation at CRT was performed with RA, RV and LV electrodes and integrated ablation catheter with an 8 mm gold tip. Results: The RV and LV stimulation were performed simultaneously at amplitude of 3 V at the LV electrode and 1 V at the RV electrode, each with a pulse width of 0.5 ms. The far-field potentials generated by the BV stimulations were perceived by the RA electrode. The far-field potential at the RA electrode tip was 32.86 mV. A far-field potential of 185.97 mV resulted at a distance of 1 mm from the RA electrode tip. AV node ablation was simulated with an applied power of 5 W at 420 kHz at the distal 8 mm ablation electrode. The temperature at the catheter tip was 103.87 ° C after 5 s ablation time, 44.17 ° C from the catheter tip in the myocardium and 37.61 ° C at a distance of 2 mm. After 10 s, the temperature at the three measuring points described above was 107.33 ° C, 50.87 ° C, 40.05 ° C and after 15 seconds 118.42 ° C, 55.75 ° C and 42.13 ° C. Conclusions: Virtual heart and electrode models as well as the simulations of electrical fields and temperature profiles allow the static and dynamic simulation of atrial synchronous BV stimulation and HF ablation at AF. The 3D simulation of the electrical field and temperature profile may be used to optimize the CRT and AF ablation.}, language = {en} } @inproceedings{GrueblBessler, author = {Gr{\"u}bl, Daniel and Bessler, Wolfgang G.}, title = {Electrochemical Pressure Impedance Spectroscopy (EPIS): A Promising Diagnostic Tool for Metal-air Batteries and Fuel Cells}, series = {68th Annual Meeting of the International Society of Electrochemistry, Providence, USA (09/2017) : Book of Abstracts}, pages = {60}, abstract = {Electrochemical impedance spectroscopy (EIS) is a widely-used diagnostic technique to characterize electrochemical processes. It is based on the dynamic analysis of two electrical observables, that is, current and voltage. Electrochemical cells with gaseous reactants or products (e.g., fuel cells, metal/air cells, electrolyzers) offer an additional observable, that is, the gas pressure. The dynamic coupling of current and/or voltage with gas pressure gives rise to a number of additional impedance definitions, for which we have introduced the term electrochemical pressure impedance spectroscopy (EPIS) [1,2]. EPIS shows a particular sensitivity towards transport processes of gas-phase or dissolved species, in particular, diffusion coefficients and transport pathway lengths. It is as such complementary to standard EIS, which is mainly sensitive towards electrochemical processes. This sensitivity can be exploited for model parameterization and validation. A general analysis of EPIS is presented, which shows the necessity of model-based interpretation of the complex EPIS shapes in the Nyquist plot (cf. Figure). We then present EPIS simulations for two different electrochemical cells: (1) a sodium/oxygen battery cell and (2) a hydrogen/air fuel cell. We use 1D or 2D electrochemical and transport models to simulate current excitation/pressure detection or pressure excitation/voltage detection. The results are compared to first EPIS experimental data available in literature [2,3].}, language = {en} } @inproceedings{RjelkaKoehlerMayer, author = {Rjelka, Marek and K{\"o}hler, Bernd and Mayer, Andreas}, title = {M{\"o}glichkeiten zur Extraktion akustoelastischer Konstanten aus dem Nichtlinearit{\"a}tsparameter akustischer Oberfl{\"a}chenwellen in metallischen Werkstoffen}, series = {DGZfP Jahrestagung 2017, 22-24 May, Koblenz, Germany}, pages = {1 -- 6}, abstract = {Zerst{\"o}rungsfreie Verfahren zur Messung von Eigenspannungen erfordern, abh{\"a}ngig vom gew{\"a}hlten Verfahren, die Kenntnis gewisser Kopplungskonstanten. Im Falle von Ultraschallmessverfahren sind das neben den elastischen Konstanten zweiter Ordnung (SOEC) vor allem die Konstanten dritter Ordnung (TOEC). Elastische Konstanten fester, metallischer Bauteile werden in der Regel in Zugversuchen bestimmt. Zur Ermittlung der TOEC werden diese mit Ultraschallmessmethoden kombiniert. Durch {\"a}ußere Einfl{\"u}sse, wie etwa mechanische Nachbehandlungen der zu untersuchenden Bauteile k{\"o}nnen sich diese Konstanten jedoch {\"a}ndern und m{\"u}ssen folglich direkt am ver{\"a}nderten Material bestimmt werden. Mithilfe von Simulationen wird die Ausbreitung der zweiten Harmonischen und der nichtlinear erzeugten Oberfl{\"a}chenwellen in Wellenmischexperimenten analysiert und der akustische Nichtlinearit{\"a}tsparameter (ANP) bzw. der Kopplungsparameter aus der Amplitudenentwicklung berechnet. Insbesondere wird untersucht, welchen Einfluss ein gegebenes Tiefenprofil der TOEC auf den ANP hat (Vorw{\"a}rtsproblem) und inwiefern sich aus den Messungen des ANP auf ein vorliegendes Tiefenprofil der TOEC schließen l{\"a}sst (inverses Problem). Außerdem wird diskutiert, welchen Einfluss lokale {\"A}nderungen der SOEC auf den ANP haben k{\"o}nnen und wie groß diese {\"A}nderungen sein d{\"u}rfen, um die TOEC dennoch bestimmen zu k{\"o}nnen. Die Untersuchungen hierzu wurden auf der Basis eines 3D-FEM Modells mit zuf{\"a}llig orientierten Mikrorissen durchgef{\"u}hrt. Die numerischen Rechnungen zeigen dabei auch eine gute {\"U}bereinstimmung mit einem aus der Literatur bekannten und f{\"u}r dieses Problem erweiterten, analytischen Modell. Neben der rissinduzierten Nichtlinearit{\"a}t kann bei diesem auch die Gitternichtlinearit{\"a}t ber{\"u}cksichtigt werden.}, language = {de} } @inproceedings{RjelkaKoehlerMayer, author = {Rjelka, Marek and K{\"o}hler, Bernd and Mayer, Andreas}, title = {Extraction of Depth Profiles of Third-Order Elastic Constants in Cracked Media}, series = {AIP Conference Proceedings 1806}, doi = {10.1063/1.4974610}, pages = {060001-1 -- 060001-9}, abstract = {Elastic constants of components are usually determined by tensile tests in combination with ultrasonic experiments. However, these properties may change due to e.g. mechanical treatments or service conditions during their lifetime. Knowledge of the actual material parameters is key to the determination of quantities like residual stresses present in the medium. In this work the acoustic nonlinearity parameter (ANP) for surface acoustic waves is examined through the derivation of an evolution equation for the amplitude of the second harmonic. Given a certain depth profile of the third-order elastic constants, the dependence of the ANP with respect to the input frequency is determined and on the basis of these results, an appropriate inversion method is developed. This method is intended for the extraction of the depth dependence of the third-order elastic constants of the material from second-harmonic generation and guided wave mixing experiments, assuming that the change in the linear Rayleigh wave velocity is small. The latter assumption is supported by a 3D-FEM model study of a medium with randomly distributed microcracks as well as theoretical works on this topic in the literature.}, language = {en} } @inproceedings{IseleRappeneckerPethetal., author = {Isele, Dietmar and Rappenecker, Klaus and Peth, Jens and Friedrich, Christoph}, title = {Additive Fertigung und optimierte Verbindungstechnik verbessern das Leichtbaupotenzial}, series = {Leichtbau grenzenlos : 8. Landshuter Leichtbau-Colloquium : Tagungsband zum Colloquium}, editor = {Huber, Otto and Bicker, Marc and Patzelt, Peter}, publisher = {LC-Verlag}, isbn = {978-3-9818439-0-3}, pages = {146 -- 158}, language = {de} } @inproceedings{JoseSikoraSchappacheretal., author = {Jose, Joseena M and Sikora, Axel and Schappacher, Manuel and Nguyen, Minh Phuong}, title = {Integration and Analysis of an Extended IEEE 802.15.4 Modules with SmartMAC and Wake-on-Radio Functions into the Network Simulator NS3}, series = {2016 3rd International Symposium on Wireless Systems within the Conferences on Intelligent Data Acquisition and Advanced Computing Systems (IDAACS-SWS)}, organization = {IEEE}, isbn = {978-1-5090-4317-0 (digital)}, doi = {10.1109/IDAACS-SWS.2016.7805778}, pages = {19 -- 23}, abstract = {Wireless Sensor Networks (WSN) have emerged as interesting topic in the research community due to its manifold applications. One of the main challenges of this field is the energy consumption of the nodes, which typically is quite restricted due to the required lifetime of such WSNs. To solve that problem several energy-saving MAC protocols have been developed so far. One of them recently presented by the authors is the so-called SmartMAC as an extension to the IEEE802.15.4 standard. In this paper, we present the implementation details of the porting of the SmartMAC protocol to the discrete event network simulator NS3. We develop this module for NS3 to simulate the performance, multi node execution, and multi node configuration. Along with this model, we also present an energy model for the evaluation of the energy consumption. The current implementation in NS3 is based on the LR-WPAN (Low-Rate Wireless Personal Area Networks) as specified by the IEEE802.15.4 (2006) standard. The simulation results show that the SmartMAC with its sleep and wake-up mechanisms for the transceivers, is significantly more efficient than the current NS3 MAC (Medium Access Control) scheme.}, language = {en} } @inproceedings{SikoraRiskeSchappacher, author = {Sikora, Axel and Riske, Alexander and Schappacher, Manuel}, title = {Entwicklung eines DGPS-gest{\"u}tzten Fahrdynamikmesssystems unter Verwendung des FPGAs Zynq-7000 mit einem Dual-Core Bare-Metal asymmetrischen Multiprozessorsystem}, series = {Tagungsband zum Workshop der Multiprojekt-Chip-Gruppe Baden-W{\"u}rttemberg, Karlsruhe, 5. Februar 2016}, volume = {55}, organization = {Hochschule Karlsruhe}, issn = {1868-9221}, pages = {23 -- 28}, abstract = {Die neueste Generation von programmierbaren Logikbausteinen verf{\"u}gt neben den konfigurierbaren Logikzellen {\"u}ber einen oder mehrere leistungsf{\"a}hige Mikroprozessoren. In dieser Arbeit wird gezeigt, wie ein bestehendes Zwei-Chip-System auf einen Xilinx Zynq 7000 mit zwei ARM A9-Cores migriert wird. Bei dem System handelt es sich um das „GPS-gest{\"u}tzte Kreisel-system ADMA" des Unternehmens GeneSys. Die neue L{\"o}sung verbessert den Datenaustausch zwischen dem ersten Mikroprozessor zur digitalen Signalverarbeitung und dem zweiten Prozessor zur Ablaufsteuerung durch ein Shared Memory. F{\"u}r die schnelle und echtzeitf{\"a}hige Daten{\"u}bertragung werden zahlreiche hochbitratige Schnittstellengenutzt.}, language = {de} } @inproceedings{SikoraSchappacherYushev, author = {Sikora, Axel and Schappacher, Manuel and Yushev, Artem}, title = {A Novel Virtualized Testbed for Embedded Networking Nodes (VTENN)}, series = {Proceedings of the 2017 IEEE International Instrumentation and Measurement Technology Conference (I2MTC)}, organization = {IEEE}, isbn = {978-1-5090-3596-0 (digital)}, doi = {10.1109/I2MTC.2017.7969667}, pages = {6}, abstract = {A novel approach of a testbed for embedded networking nodes has been conceptualized and implemented. It is based on the use of virtual nodes in a PC environment, where each node executes the original embedded code. Different nodes are running in parallel and are connected via so-called virtual interfaces. The presented approach is very efficient and allows a simple description of test cases without the need of a network simulator. Furthermore, it speeds up the process of developing new features.}, language = {en} } @inproceedings{JunkFleigFink, author = {Junk, Stefan and Fleig, Claus and Fink, Bj{\"o}rn}, title = {Improvement of Sustainability Through the Application of Topology Optimization in the Additive Manufacturing of a Brake Mount}, series = {Sustainable Design and Manufacturing 2017, Smart Innovation, Systems and Technologies : Selected papers on Sustainable Design and Manufacturing}, publisher = {Springer}, isbn = {978-3-319-57077-8}, pages = {151 -- 161}, language = {de} } @inproceedings{Junk, author = {Junk, Stefan}, title = {Integration of sustainable design and additive manufacturing in design education}, series = {Challenges for Technology Innovation: An Agenda for the Future Proceedings of the International Conference on Sustainable Smart Manufacturing (S2M), Lisbon, Portugal, 20-22 October 2016}, publisher = {Taylor \& Francis Group}, address = {London}, isbn = {978-1-138-71374-1}, pages = {171 -- 175}, language = {en} } @inproceedings{JunkBambach, author = {Junk, Stefan and Bambach, Markaus}, title = {Application of 3D (color) printing for the visualization and optimization of complex metal forming processes}, series = {Procedia Engineering International Conference on the Technology of Plasticity, ICTP 2017, 17-22 Septembr 2017, Cambridge, United Kingdom}, volume = {207}, issn = {1877-7058}, pages = {1081 -- 1086}, language = {en} } @inproceedings{JunkGawron, author = {Junk, Stefan and Gawron, Philipp}, title = {Development of parametric CAAD models for the additive manufacturing of scalable architectural models}, series = {ShoCK! - Sharing Computational Knowledge International Conference on Education and Research in Computer Aided Architectural Design in Europe 35., 2017, Rome}, address = {Rome}, isbn = {978-94-91207-12-9}, pages = {419 -- 426}, language = {en} } @inproceedings{JunkSchroederHangst, author = {Junk, Stefan and Schr{\"o}der, Werner and Hangst, Nikolai}, title = {Implementation of lightweight design in the product development process of unmanned aerial vehicles}, series = {Proceedings of the 21st International Conference on Engineering Design (ICED 17)}, organization = {Design Society}, isbn = {978-1-904670-93-3}, issn = {2220-4342}, pages = {011 -- 020}, language = {en} } @inproceedings{KornGerbaulet, author = {Korn, Oliver and Gerbaulet, Damian}, title = {Do Zenware Applications Reduce the Digital Distraction of Knowledge Workers? A Qualitative Study Based on Expert Interviews}, series = {AHFE 2017: Advances in Ergonomics in Design}, volume = {588}, publisher = {Springer}, address = {Cham}, isbn = {978-3-319-60582-1}, issn = {2194-5357}, doi = {10.1007/978-3-319-60582-1_12}, pages = {115 -- 126}, abstract = {Applications helping us to maintain the focus on work are called "Zenware" (from concentration and Zen). While form factors, use cases and functionality vary, all these applications have a common goal: creating uninterrupted, focused attention on the task at hand. The rise of such tools exemplifies the users' desire to control their attention within the context of omnipresent distraction. In expert interviews we investigate approaches in the context of attention-management at the workplace of knowledge workers. To gain a broad understanding, we use judgement sampling in interviews with experts from several disciplines. We especially explore how focus and flow can be stimulated. Our contribution has four components: a brief overview on the state of the art (1), a presentation of the results (2), strategies for coping with digital distractions and design guidelines for future Zenware (3) and an outlook on the overall potential in digital work environments (4).}, language = {en} } @inproceedings{KornTsoPapagrigoriouetal., author = {Korn, Oliver and Tso, Leslie and Papagrigoriou, Cristos and Sowoidnich, Yannic and Konrad, Robert and Schmidt, Albrecht}, title = {Computerized Assessment of the Skills of Impaired and Elderly Workers. A Tool Survey and Comparative Study}, isbn = {978-1-4503-4337-4}, pages = {50:1 -- 50:8}, language = {en} } @inproceedings{SharmaSairamYadavetal., author = {Sharma, Ravi and Sairam, Ashok Singh and Yadav, Akash and Sikora, Axel}, title = {Tunable Synchronization in Duty-cycled Wireless Sensor Networks}, series = {2016 IEEE International Conference on Advanced Networks and Telecommunications Systems (ANTS)}, isbn = {978-1-5090-2193-2 (digital)}, doi = {10.1109/ANTS.2016.7947782}, pages = {856 -- 860}, abstract = {In this work, we consider a duty-cycled wireless sensor network with the assumption that the on/off schedules are uncoordinated. In such networks, as all nodes may not be awake during the transmission of time synchronization messages, nodes will require to re-transmit the synchronization messages. Ideally a node should re-transmit for the maximum sleep duration to ensure that all nodes are synchronized. However, such a proposition will immensely increase the energy consumption of the nodes. Such a situation demands that there is an upper bound of the number of retransmissions. We refer to the time a node spends in re-transmission of the control message as broadcast duration. We ask the question, what should be the broadcast duration to ensure that a certain percentage of the available nodes are synchronized. The problem to estimate the broadcast duration is formulated so as to capture the probability threshold of the nodes being synchronized. Results show the proposed analytical model can predict the broadcast duration with a given lower error margin under real world conditions, thus demonstrating the efficiency of our solution.}, language = {en} } @inproceedings{ElayanithottathilYushevSikoraetal., author = {Elayanithottathil, Jubin Sebastian and Yushev, Artem and Sikora, Axel and Schappacher, Manuel and Prasetyo, Junaedi Adi}, title = {Performance Investigation Of 6Lo With RPL Mesh Networking For Home And Building Automation}, series = {2016 3rd International Symposium on Wireless Systems within the Conferences on Intelligent Data Acquisition and Advanced Computing Systems (IDAACS-SWS)}, organization = {IEEE}, isbn = {978-1-5090-4317-0 (digital)}, doi = {10.1109/IDAACS-SWS.2016.7805801}, pages = {127 -- 133}, abstract = {IPv6 over resource-constrained devices (6Lo) emerged as a de-facto standard for the Internet of Things (IoT) applications especially in home and building automation systems. We provide results of an investigation of the applicability of 6LoWPAN with RPL mesh networks for home and building automation use cases. The proper selection of Trickle parameters and neighbor reachable time-outs is important in the RPL protocol suite to respond efficiently to any path failure. These parameters were analyzed in the context of energy consumption w.r.t the number of control packets. The measurements were performed in an Automated Physical Testbeds (APTB). The results match the recommendation by RFC 7733 for selecting various parameters of RPL protocol suite. This paper shows the relationship between various RPL parameters and control traffic overhead during network rebuild. Comparative measurement results with Bluetooth Low Energy (BLE) in this work showed that 6Lo with RPL outperformed BLE in this use case with less control traffic overheads.}, language = {en} } @inproceedings{KuenzelWeidlich, author = {K{\"u}nzel, Thomas and Weidlich, Anke}, title = {Methodik zur Quantifizierung der Grenzkosten flexibler Systemkomponenten in Zeiten steigender volatiler Einspeisung aus Erneuerbaren Energien}, pages = {110 -- 114}, language = {de} } @inproceedings{YushevWalzSikora, author = {Yushev, Artem and Walz, Andreas and Sikora, Axel}, title = {Securing Embedded Communication with TLS1.2}, series = {embedded world conference 2015, Nuremberg, 24.-26. Feb. 2015}, language = {en} } @inproceedings{YushevSikoraElayanithottathil, author = {Yushev, Artem and Sikora, Axel and Elayanithottathil, Jubin Sebastian}, title = {Open source 6Lo protocol stack for wireless embedded systems}, series = {Wireless Telecommunications Symposium (WTS)}, isbn = {978-1-5090-0314-3}, doi = {10.1109/WTS.2016.7482044}, pages = {7}, abstract = {In the last decade, IPv6 over Low power Wireless Personal Area Networks (IEEE802.15.4), also known as 6LoWPAN, has well evolved as a primary contender for short range wireless communications and holds the promise of an Internet of Things, which is completely based on the Internet Protocol. The authors' team has developed a 6LoWPAN protocol stack in C language, the stack without the necessity to use a specific design environment or operating system. It is highly flexible, modular, and portable and can be enhanced by several interesting modules, like a Wake-On-Radio-(WOR) MAC layer or a TLS1.2 based security sublayer. The stack is made available as open source at https://github.com/hso-esk/emb6. It was extensively tested on the Automated Physical Testbed (APTB) for Wireless Systems, which is available in the authors' lab and allows a flexible setup and full control of arbitrary topologies. The results of the measurements demonstrate a very good stability and short-term with long-term performance also under dynamic conditions.}, language = {en} } @inproceedings{YushevSikoraSchappacher, author = {Yushev, Artem and Sikora, Axel and Schappacher, Manuel}, title = {Verification and Validation of 6Lo Protocol Stacks}, series = {Proceedings of the Wireless Congress 2016}, address = {M{\"u}nchen}, isbn = {978-3-645-50161-3}, pages = {903 -- 907}, language = {en} } @inproceedings{YushevSchappacherSikora, author = {Yushev, Artem and Schappacher, Manuel and Sikora, Axel}, title = {Titan TTCN-3 Based Test Framework for Resource Constrained Systems}, series = {MATEC Web Conference}, doi = {10.1051/matecconf/20167506005}, pages = {5}, abstract = {Wireless communication systems more and more become part of our daily live. Especially with the Internet of Things (IoT) the overall connectivity increases rapidly since everyday objects become part of the global network. For this purpose several new wireless protocols have arisen, whereas 6LoWPAN (IPv6 over Low power Wireless Personal Area Networks) can be seen as one of the most important protocols within this sector. Originally designed on top of the IEEE802.15.4 standard it is a subject to various adaptions that will allow to use 6LoWPAN over different technologies; e.g. DECT Ultra Low Energy (ULE). Although this high connectivity offers a lot of new possibilities, there are several requirements and pitfalls coming along with such new systems. With an increasing number of connected devices the interoperability between different providers is one of the biggest challenges, which makes it necessary to verify the functionality and stability of the devices and the network. Therefore testing becomes one of the key components that decides on success or failure of such a system. Although there are several protocol implementations commonly available; e.g., for IoT based systems, there is still a lack of according tools and environments as well as for functional and conformance testing. This article describes the architecture and functioning of the proposed test framework based on Testing and Test Control Notation Version 3 (TTCN-3) for 6LoWPAN over ULE networks.}, language = {en} } @inproceedings{KornTietz, author = {Korn, Oliver and Tietz, Stefan}, title = {Strategies for Playful Design when Gamifying Rehabilitation. A Study on User Experience}, series = {Proceedings of the 10th International Conference on Pervasive Technologies Related to Assistive Environments}, publisher = {Association for Computing Machinery}, address = {New York}, isbn = {978-1-4503-5227-7}, doi = {10.1145/3056540.3056550}, url = {http://nbn-resolving.de/urn:nbn:de:bsz:ofb1-opus4-26480}, pages = {209 -- 214}, abstract = {Gamifying rehabilitation is an efficient way to improve motivation and exercise frequency. However, between flow theory, self-determination theory or Bartle's player types there is much room for speculation regarding the mechanics required for successful gamification, which in turn leads to increased motivation. For our study, we selected a gamified solution for motion training (an exergame) where the playful design elements are extremely simple. The contribution is three-fold: we show best practices from the state of the art, present a study analyzing the effects of simple gamification mechanics on a quantitative and on a qualitative level and discuss strategies for playful design in therapeutic movement games.}, language = {en} } @inproceedings{KornStammMoeckl, author = {Korn, Oliver and Stamm, Lukas and M{\"o}ckl, Gerd}, title = {Designing Authentic Emotions for Non-Human Characters. A Study Evaluating Virtual Affective Behavior}, series = {Designing Interactive Systems Conference 2017 Proceedings}, publisher = {Association for Computing Machinery}, address = {New York}, isbn = {978-1-4503-4922-2}, doi = {10.1145/3064663.3064755}, pages = {477 -- 487}, abstract = {While human emotions have been researched for decades, designing authentic emotional behavior for non-human characters has received less attention. However, virtual behavior not only affects game design, but also allows creating authentic avatars or robotic companions. After a discussion of methods to model and recognize emotions, we present three characters with a decreasing level of human features and describe how established design techniques can be adapted for such characters. In a study, 220 participants assess these characters' emotional behavior, focusing on the emotion "anger". We want to determine how reliable users can recognize emotional behavior, if characters increasingly do not look and behave like humans. A secondary aim is determining if gender has an impact on the competence in emotion recognition. The findings indicate that there is an area of insecure attribution of virtual affective behavior not distant but close to human behavior. We also found that at least for anger, men and women assess emotional behavior equally well.}, language = {en} } @inproceedings{KornReesDix, author = {Korn, Oliver and Rees, Adrian and Dix, Alan}, title = {Designing a System for Playful Coached Learning in the STEM Curriculum}, series = {SmartLearn '17 Proceedings of the 2017 ACM Workshop on Intelligent Interfaces for Ubiquitous and Smart Learning}, publisher = {Association for Computing Machinery}, address = {New York}, isbn = {978-1-4503-4904-8}, doi = {10.1145/3038535.3038538}, url = {http://nbn-resolving.de/urn:nbn:de:bsz:ofb1-opus4-26533}, pages = {31 -- 37}, abstract = {We present the design outline of a context-aware interactive system for smart learning in the STEM curriculum (science, technology, engineering, and mathematics). It is based on a gameful design approach and enables "playful coached learning" (PCL): a learning process enriched by gamification but also close to the learner's activities and emotional setting. After a brief introduction on related work, we describe the technological setup, the integration of projected visual feedback and the use of object and motion recognition to interpret the learner's actions. We explain how this combination enables rapid feedback and why this is particularly important for correct habit formation in practical skills training. In a second step, we discuss gamification methods and analyze which are best suited for the PCL system. Finally, emotion recognition, a major element of the final PCL design not yet implemented, is briefly outlined.}, language = {en} } @inproceedings{SchicklDorerWuelkeretal., author = {Schickl, Lukas and Dorer, Klaus and W{\"u}lker, Michael and Hochberg, Ulrich}, title = {Development of a Six-Axis Force and Torque Sensor for the Humanoid Robot Sweaty 2.0}, language = {en} } @inproceedings{ToumassianWernerSikora, author = {Toumassian, Sebouh and Werner, Rico and Sikora, Axel}, title = {Performance Measurements for Hypervisors on Embedded ARM Processors}, series = {2016 International Conference on Advances in Computing, Communications and Informatics (ICACCI)}, organization = {IEEE}, isbn = {978-1-5090-2029-4 (digital)}, doi = {10.1109/ICACCI.2016.7732152}, pages = {5}, abstract = {Due to its numerous application fields and benefits, virtualization has become an interesting and attractive topic in computer and mobile systems, as it promises advantages for security and cost efficiency. However, it may bring additional performance overhead. Recently, CPU virtualization has become more popular for embedded platforms, where the performance overhead is especially critical. In this article, we present the measurements of the performance overhead of the two hypervisors Xen and Jailhouse on ARM processors in the context of the heavy load "Cpuburn-a8" application and compare it to a native Linux system running on ARM processors.}, language = {en} } @inproceedings{ZeiserWesthoff, author = {Zeiser, Maximilian and Westhoff, Dirk}, title = {Re-visited: On the Value of purely Software-based Code Attestation for Embedded Devices}, series = {InInnovations for Community Services}, editor = {Fahrnberger, G{\"u}nter and Eichler, Gerald and Erfurth, Christian}, publisher = {Springer}, address = {Cham}, isbn = {978-3-319-49465-4 (Print)}, doi = {10.1007/978-3-319-49466-1_6}, pages = {75 -- 89}, abstract = {Remote code attestation protocols are an essential building block to offer a reasonable system security for wireless embedded devices. In the work at hand we investigate in detail the trustability of a purely software-based remote code attestation based inference mechanism over the wireless when e.g. running the prominent protocol derivate SoftWare-based ATTestation for Embedded Devices (SWATT). Besides the disclosure of pitfalls of such a protocol class we also point out good parameter choices which allow at least a meaningful plausibility check with a balanced false positive and false negative ratio.}, language = {en} } @inproceedings{SchmidtMayer, author = {Schmidt, Michael and Mayer, Oliver}, title = {Forecast accuracy measures for micro-grid operation}, organization = {IEEE}, doi = {10.1109/ICSGCE.2015.7454292}, pages = {176 -- 179}, language = {en} } @inproceedings{Dorer, author = {Dorer, Klaus}, title = {Learning to Use Toes in a Humanoid Robot}, series = {RoboCup 2017: Robot World Cup XXI}, editor = {Akiyama, Hidehisa and Obst, Oliver and Sammut, Claude and Tonidandel, Flavio}, publisher = {Springer}, address = {Heidelberg}, pages = {100 -- 111}, abstract = {In this paper we show that a model-free approach to learn behaviors in joint space can be successfully used to utilize toes of a humanoid robot. Keeping the approach model-free makes it applicable to any kind of humanoid robot, or robot in general. Here we focus on the benefit on robots with toes which is otherwise more difficult to exploit. The task has been to learn different kick behaviors on simulated Nao robots with toes in the RoboCup 3D soccer simulator. As a result, the robot learned to step on its toe for a kick that performs 30\% better than learning the same kick without toes.}, language = {en} } @inproceedings{PfletschingerClosas, author = {Pfletschinger, Stephan and Closas, Pau}, title = {Non-Orthogonal Frame Synchronization for Low Latency Communication}, series = {IEEE 86th Vehicular Technology Conference: VTC2017-Fall 24-27 September 2017, Toronto, Canada}, pages = {1 -- 5}, abstract = {In this paper, we present a frame synchronization method which consists of the non-orthogonal superposition of a synchronization sequence and the data. We derive the optimum detection criterion and compare it to the classical sequential concatenation of synchronization and data sequences. Computer simulations confirm the benefits of the non-orthogonal allocation for the case of short frames, which makes this technique particularly suited for the increasingly important regime of low latency and ultra-reliable communication.}, language = {en} } @inproceedings{BuergerSawantBohlayeretal., author = {B{\"u}rger, Adrian and Sawant, Parantapa and Bohlayer, Markus and Altmann-Dieses, Angelika and Braun, Marco and Diehl, Moritz}, title = {Efficient operation scheduling for adsorption chillers using predictive optimization-based control methods}, series = {4th International Conference on MechanicalEngineering Research (ICMER2017)}, issn = {1757-8981}, doi = {10.1088/1757-899X/257/1/012007}, pages = {1 -- 11}, language = {en} } @inproceedings{CurticapeanWozniakJavahiralyetal., author = {Curticapean, Dan and Wozniak, Peter and Javahiraly, Nicolas and Vauderwange, Oliver}, title = {Augmented Reality Based Real-Time Data Visualization Concept for Ultra-Efficient Car Prototype}, series = {Frontiers in Optics, OSA Technical Digest (online)}, publisher = {Optical Society of America}, address = {Washington, D.C. United States}, isbn = {978-1-943580-33-0}, doi = {10.1364/FIO.2017.JTu2A.97}, pages = {1 -- 2}, abstract = {For an ultra-efficient car-engineering project, we aim to utilize AR technology for the driver and engineering team. A real-time monitoring of the car's operational parameters is crucial for best possible fuel efficiency and overall performance.}, language = {en} } @inproceedings{CurticapeanVauderwangeWozniaketal., author = {Curticapean, Dan and Vauderwange, Oliver and Wozniak, Peter and Javahiraly, Nicolas}, title = {New Perspectives in Color Vision using Spectroscopy and Nanotechnology: Application to Media Photonics}, series = {Frontiers in Optics, OSA Technical Digest (online)}, publisher = {Optical Society of America}, address = {Washington, D.C. United States}, isbn = {978-1-943580-33-0}, doi = {10.1364/FIO.2017.JTu2A.115}, pages = {1 -- 2}, abstract = {This paper summarizes the basic ideas of the actual research work, based on the question, how quantum dots changes the possibilities of color rendering, with the focus on the human visual perception.}, language = {en} } @inproceedings{CurticapeanWozniakJavahiraly, author = {Curticapean, Dan and Wozniak, Peter and Javahiraly, Nicolas}, title = {Real-time augmented reality overlay for an energy-efficient car study}, series = {Proceedings of SPIE Digital Optical Technologies, 2017, Munich, Germany}, volume = {10335}, publisher = {SPIE}, address = {Bellingham, WA}, organization = {SPIE}, doi = {10.1117/12.2270328}, pages = {1 -- 8}, abstract = {Our university carries out various research projects. Among others, the project Schluckspecht is an interdisciplinary work on different ultra-efficient car concepts for international contests. Besides the engineering work, one part of the project deals with real-time data visualization. In order to increase the efficiency of the vehicle, an online monitoring of the runtime parameters is necessary. The driving parameters of the vehicle are transmitted to a processing station via a wireless network connection. We plan to use an augmented reality (AR) application to visualize different data on top of the view of the real car. By utilizing a mobile Android or iOS device a user can interactively view various real-time and statistical data. The car and its components are meant to be augmented by various additional information, whereby that information should appear at the correct position of the components. An engine e.g. could show the current rpm and consumption values. A battery on the other hand could show the current charge level. The goal of this paper is to evaluate different possible approaches, their suitability and to expand our application to other projects at our university.}, language = {en} } @inproceedings{ZellBauerHochberg, author = {Zell, Christiane and Bauer, Annika and Hochberg, Ulrich}, title = {Biogas Upgrading by In Situ Methanation of Hydrogen in a Membrane Biogas Reactor}, series = {BIT's 9th Annual World Congress of Industrial Biotechnology}, address = {Seoul}, pages = {66}, language = {en} } @inproceedings{ZerresIsraelTscheulin, author = {Zerres, Christopher and Israel, Kai and Tscheulin, Dieter K.}, title = {Reducing Cybersickness: The Role of Wearing Comfort and Ease of Use}, series = {Frontiers in Optics 2017, Washington, D.C. United States 18-21 September 2017}, address = {Washington, D.C.}, organization = {Optical Society of America}, doi = {10.1364/FIO.2017.JTu2A.113}, pages = {JTu2A.113.}, abstract = {The paper focuses on how wearing comfort and ease of use of smartphone-based head-mounted displays can minimize the occurrence of cybersickness.}, language = {en} } @inproceedings{CanzSikorski, author = {Canz, Michael and Sikorski, Evgenia}, title = {Wie man die Vorlesung "Technische Mechanik 1 - Statik" f{\"u}r alle Beteiligten dynamisch gestaltet}, series = {3. Symposium zur Hochschullehre in den MINT-F{\"a}chern am 25. und 26. September 2017 an der Technischen Hochschule N{\"u}rnberg Georg Simon Ohm in Kooperation mit dem DiZ - Zentrum f{\"u}r Hochschuldidaktik}, pages = {1 -- 7}, abstract = {Lehrende nehmen vielf{\"a}ltige Ver{\"a}nderungen, insbesondere bei Studienanf{\"a}ngern wahr: Vorkenntnisse, Aufnahme- und Konzentrationsf{\"a}higkeit werden zunehmend heterogener. In der Vorlesung „Technische Mechanik 1" wurde darauf konstruktiv reagiert, indem der Ablauf und die Struktur ver{\"a}ndert wurden. Aufgaben und ihre L{\"o}sungen stehen im Mittelpunkt des Unterrichts. Neben der Lehrenden als aktiv Handelnde wird jeder Studierende im Lauf des Semesters in den Ablauf integriert und muss individuelle L{\"o}sungen der verteilten Aufgaben pr{\"a}sentieren. Im Vergleich entwickeln die Studierenden durch „Lernen am Modell" dadurch ihre methodischen und fachlichen F{\"a}higkeiten weiter. Um den Studierenden die Relevanz der behandelten Themenbereiche zu verdeutlichen wurden spezielle Aufgaben mit einem lebensweltlichem Bezug entwickelt. Befragungen zeigen, dass die Studierenden von den vielf{\"a}ltigen interaktiven Lernangeboten profitieren und die entwickelten Kompetenzen auch auf andere Lernsituationen {\"u}bertragen.}, language = {de} } @inproceedings{LauerDattaKauretal., author = {Lauer, Tobias and Datta, Amitava and Kaur, Amardeep and Chabbouh, Sami}, title = {Parallel Subspace Clustering Using Multi-core and Many-core Architectures}, series = {New Trends in Databases and Information Systems}, editor = {Kirikova, Mārīte and N{\o}rv{\aa}g, Kjetil and Papadopoulos, George and Gamper, Johann and Wrembel, Robert and Darmont, J{\´e}r{\^o}me and Rizzi, Stefano}, publisher = {Springer}, address = {Cham}, isbn = {978-3-319-67161-1}, issn = {1865-0929}, doi = {10.1007/978-3-319-67162-8_21}, pages = {213 -- 223}, abstract = {Finding clusters in high dimensional data is a challenging research problem. Subspace clustering algorithms aim to find clusters in all possible subspaces of the dataset where, a subspace is the subset of dimensions of the data. But exponential increase in the number of subspaces with the dimensionality of data renders most of the algorithms inefficient as well as ineffective. Moreover, these algorithms have ingrained data dependency in the clustering process, thus, parallelization becomes difficult and inefficient. SUBSCALE is a recent subspace clustering algorithm which is scalable with the dimensions and contains independent processing steps which can be exploited through parallelism. In this paper, we aim to leverage, firstly, the computational power of widely available multi-core processors to improve the runtime performance of the SUBSCALE algorithm. The experimental evaluation has shown linear speedup. Secondly, we are developing an approach using graphics processing units (GPUs) for fine-grained data parallelism to accelerate the computation further. First tests of the GPU implementation show very promising results.}, language = {en} } @inproceedings{SawantDoan, author = {Sawant, Parantapa and Doan, Minh Dang}, title = {Modelling and Simulation of Microscale Trigeneration Systems Based on Real- Life Experimental Data}, series = {20th IFAC World Congress 2017, IFAC-PapersOnLine}, volume = {50}, number = {1}, publisher = {Elsevier}, address = {Amsterdam}, issn = {2405-8963}, doi = {10.1016/j.ifacol.2017.08.452}, pages = {3238 -- 3243}, language = {en} } @inproceedings{SawantPfafferott, author = {Sawant, Parantapa and Pfafferott, Jens}, title = {Experimental Analysis of Microscale Trigeneration Systems to Achieve Thermal Comfort in Smart Buildings}, series = {36. AVIC Madrid}, pages = {309 -- 319}, language = {en} } @inproceedings{SawantPfafferott, author = {Sawant, Parantapa and Pfafferott, Jens}, title = {Experimental Investigation of a Real-Life Microscale Trigeneration System Using Adsorption Cooling, Reversible Heat Pump and a Cogeneration Unit}, series = {7th International Conference on Experiments/Process/System Modeling/Simulation/Optimisation (7th IC-EpsMsO) From 2017-07-05 to 2017-07-08, Greece}, pages = {155 -- 165}, language = {en} } @inproceedings{ZellHochbergHaas, author = {Zell, Christiane and Hochberg, Ulrich and Haas, Katharina}, title = {Biological in situ methanation: Gassing concept and feeding strategy for enhanced performance}, series = {International Biotechnology Congress-2017 April 25-27, 2017 Xi'an, China}, pages = {1 -- 1}, abstract = {The expansion of fluctuating renewable electricity production from wind and solar energy requires huge storage capacities. Power-to-gas (PtG) can contribute to tackle that issue via a two-step process, the electrolytic production of hydrogen and a subsequent methanation step (with additional CO2). The resulting fully grid compatible methane, also known as synthetic natural gas (SNG), can be both stored and transported in the vast existing natural gas infrastructure. To overcome current major drawbacks of PtG, the relatively low efficiency and the high costs, we developed an improved method for the methanation step. In our approach we use a further development of the biological in situ methanation of hydrogen in biogas plants. Because this strategy uses directly internal residual CO2 from the biogas process in the biogas plant, you neither need additional external CO2 nor special reactors. Thus, PtG is combined with the production of an upgraded highly methane rich raw biogas. However, the low solubility of hydrogen in aqueous solutions and the exploitation of the maximum biological production rates are still an engineering challenge for high performance biological in situ methanation. In our experiments a setup with membrane gassing turned out to be most promising to ensure a sufficient gas liquid mass transfer of the hydrogen. The monitoring of hydrogenotrophic and aceticlastic archaea showed some adaption of these microbial subgroups to the hydrogen feed. In order to achieve high methane concentrations of more than 90 \% in the raw biogas a CO2-controlled hydrogen feed flow rate is suggested. For methane concentrations lower than 90 \% simple current controlled hydrogen supply can be applied.}, language = {en} } @inproceedings{WendtLaiKoenigetal., author = {Wendt, Thomas and Lai, Matthias and K{\"o}nig, Patrick and Waßmer, Matthias and Himmelsbach, Urban}, title = {Medienzugriffsverfahren bei der drahtlosen Kommunikation f{\"u}r funktional sichere Anwendungen}, series = {Forum Safety \& Security}, address = {M{\"u}nchen}, organization = {WEKA Fachmedien}, pages = {1 -- 5}, language = {de} } @inproceedings{WendtHimmelsbachLaietal., author = {Wendt, Thomas and Himmelsbach, Urban and Lai, Matthias and Waßmer, Matthias}, title = {Architecture for Achieving Multiple Diversity Gain for Latency-Critical Applications}, series = {2017 Wireless Days : Proceedings}, address = {Porto, Portugal}, organization = {IEEE}, isbn = {978-1-5090-5856-3 (Elektronisch)}, doi = {10.1109/WD.2017.7918113}, pages = {4}, abstract = {In safety critical applications wireless technologies are not widely spread. This is mainly due to reliability and latency requirements. In this paper a new wireless architecture is presented which will allow for customizing the latency and reliability for every single participant within the network. The architecture allows for building up a network of inhomogeneous participants with different reliability and latency requirements. The used TDMA scheme with TDD as duplex method is acting gentle on resources. Therefore participants with different processing and energy resources are able to participate.}, language = {en} } @inproceedings{LaiWendtWassmeretal., author = {Lai, Matthias and Wendt, Thomas and Waßmer, Matthias and Himmelsbach, Urban}, title = {A Simple and Robust Architecture for Reliable, Latency-Critical Applications within Medical Operating Rooms}, series = {2017 Wireless Telecommunications Symposium (WTS)}, address = {Chicago, USA}, organization = {IEEE}, isbn = {978-1-5090-3599-1 (Elektronisch)}, doi = {10.1109/WTS.2017.7943541}, pages = {4}, abstract = {In medical applications wireless technologies are not widely spread. Today they are mainly used in non latency-critical applications where reliability can be guaranteed through retransmission protocols and error correction mechanisms. By using retransmission protocols within the disturbed shared wireless channel latency will increase. Therefore retransmission protocols are not sufficient for removing latency-critical wired connections within operating rooms such as foot switches. Todays research aims to improve reliability through the physical characteristics of the wireless channel by using diversity methods and more robust modulation. In this paper an Architecture for building up a reliable network is presented. The Architecture offers the possibility for devices with different reliability, latency and energy consumption requirements to participate. Furthermore reliability, latency and energy consumption are scalable for every single participant.}, language = {en} } @inproceedings{WendtHimmelsbachLaietal., author = {Wendt, Thomas and Himmelsbach, Urban and Lai, Matthias and Waßmer, Matthias}, title = {Sichere Detektion von Menschen in der Mensch-Roboter-Kollaboration mit Time-of-Flight Kameras}, series = {Forum Safety \& Security}, address = {M{\"u}nchen}, pages = {1 -- 4}, language = {de} } @inproceedings{DeckerMeier, author = {Decker, Eva and Meier, Barbara}, title = {Preparatory course in mathematics using the mobile app TeachMatics.}, series = {UPDATE 2017 ON HIGHER EDUCATION International week 25.-29.9.2017}, editor = {Mirola, Tuuli}, publisher = {Saimaa University of Applied Sciences Publications}, address = {Saimaa, Finnland.}, organization = {Saimaan ammattikorkeakoulu}, isbn = {978-952-7055-46-5}, issn = {1797-7266}, pages = {133 -- 140}, language = {en} } @inproceedings{Decker, author = {Decker, Eva}, title = {Tablet-basiertes Mitmach-Skript.}, series = {Tagungsband zum 3. Symposium zur Hochschullehre in den MINT-F{\"a}chern. DiNa-Sonderausgabe.}, editor = {Meissner, Barbara and Walter, Claudia and Zinger, Benjamin}, publisher = {DiZ}, address = {Ingolstadt}, organization = {Technische Hochschule N{\"u}rnberg. Georg Simon Ohm.}, pages = {168 -- 173}, language = {de} } @inproceedings{BreyerMaylaenderRitter, author = {Breyer-Mayl{\"a}nder, Thomas and Ritter, Beate}, title = {Ganztagsschule in Baden-W{\"u}rttemberg - aktueller Sachstand und Perspektiven}, series = {Ganztagsschule und Umweltbildung, Tagungsband zur Tagung am 09.-10. Oktober 2014}, publisher = {Schneiderverlage Hohengehren}, address = {Hohengehren}, isbn = {978384015730}, pages = {21 -- 29}, language = {de} } @inproceedings{Mandal, author = {Mandal, Avikarsha}, title = {Privacy Preserving Consensus-Based Economic Dispatch in Smart Grid Systems}, doi = {10.1007/978-3-319-48021-3_7}, pages = {13}, language = {en} } @inproceedings{IsmerHolzerBraun, author = {Ismer, Bruno and Holzer, Fabian and Braun, Manuel}, title = {RF Ablation Catheter Tip Material versus Lesion Geometry - The Value of Gold}, series = {Biomedical Engineering / Biomedizinische Technik}, volume = {59}, number = {S1}, publisher = {Walter de Gruyter}, address = {Berlin, Boston}, issn = {0013-5585 (Print)}, doi = {10.1515/bmt-2014-5015}, pages = {1202}, abstract = {Introduction: Radiofrequency ablation allows successful treatment of most supraventricular reentrant and focal tachycardias and an increasing number of ventricular tachycardias. Different catheter tips are used. While AV nodal reentrant tachycardias require catheters with a tip of 4mm length, an 8 mm tip electrodes will be used for atrial flutter. A pulmonary vein isolation will be performed using 4 mm irrigated tip electrodes to achieve larger and deeper lesions. The need of a tubing set and pump for saline transfusion is a disadvantage of this technique. Gold tip electrodes can alternatively be used to produce increases in lesion size. Aim of this study was to compare RF ablation catheters of exactly the same geometry with either platin-iridum or gold tip. Methods: Gold provides an almost four-fold thermal conductivity compared with platinum-iridium. The Cerablate G flutter (Osypka AG, Rheinfelden-Herten) is a newly designed radiofrequency ablation catheter with an 8 mm gold tip. Its power delivery was compared with the Cerablate flutter of same geometry but platin-iridium tip. Therefore, in-vitro RF ablations were performed using pork meat in a 0.9\% saline solution at 37°C temperature. A pulsed volume flow was generated using a pump to simulate the blood flow. Temperature controlled ablations of 60 seconds using 45, 55 and 65°C and a maximum of 70W RF power were performed. Results: Using the Osypka HAT300smart ablator, cumulative power of 167, 474 and 672W was delivered with gold tip against 121, 227 and 310 W with platin-iridium tip. By the Stockert SmartAblate G4 ablator, 202, 546 and 1075W was delivered with gold tip against 117, 246 and 394W with platin-iridium using 45, 55 and 65°C temperature. Conclusion: During in-vitro investigations, the gold tip electrodes allowed a in power delivery increase of 117 up to 173\%. Thus, gold tips can be used to increase lesion depth and diameter without cooling equipment.}, language = {en} } @inproceedings{ZellHochbergHaasetal., author = {Zell, Christiane and Hochberg, Ulrich and Haas, Katharina and Bauer, Annika}, title = {Feasible operating conditions for biological in situ methanation in biogas reactors}, pages = {21}, language = {en} } @inproceedings{FunkKoschKettneretal., author = {Funk, Markus and Kosch, Thomas and Kettner, Romina and Korn, Oliver and Schmidt, Albert}, title = {motionEAP: An Overview of 4 Years of Combining Industrial Assembly with Augmented Reality for Industry 4.0}, series = {Proceedings of the 16th international conference on knowledge technologies and data-driven business}, pages = {4}, abstract = {With our society moving towards Industry 4.0, an increasing number of tasks and procedures in manual workplaces are augmented with a digital component. While the research area of Internet-of-Things focuses on combining physical objects with their digital counterpart, the question arises how the interface to human workers should be designed in such Industry 4.0 environments. The project motionEAP focuses on using Augmented Reality for creating an interface between workers and digital products in interactive workplace scenarios. In this paper, we summarize the work that has been done in the motionEAP project over the run-time of 4 years. Further, we provide guidelines for creating interactive workplaces using Augmented Reality, based on the experience we gained.}, language = {en} } @inproceedings{KokKarnouskosNestleetal., author = {Kok, Koen and Karnouskos, Stamatis and Nestle, David and Dimeas, Aris and Weidlich, Anke and Warmer, Cor and Strauss, Philipp and Buchholz, Britta and Drenkard, Stefan and Hatziargyriou, Nikos and Lioliou, Vali}, title = {Smart Houses in the Smart Grid}, series = {IEEE Electrification Magazine}, volume = {2}, number = {1}, isbn = {978-1-84919126-5}, issn = {0537-9989}, doi = {10.1049/cp.2009.0961}, pages = {81 -- 93}, abstract = {Innovative technologies and concepts will emerge as we move towards a more dynamic, service-based, market-driven infrastructure, where energy efficiency and savings can be facilitated by interactive distribution networks. A new generation of fully interactive Information and Communication Technologies (ICT) infrastructure has to be developed to support the optimal exploitation of the changing, complex business processes and to enable the efficient functioning of the deregulated energy market for the benefit of citizens and businesses. The architecture of such distributed system landscapes must be designed and validated, standards need to be created and widely supported, and comprehensive, reliable IT applications will need to be implemented. The collaboration between a smart house and a smart grid is a promising approach which, with the help of ICT can fully unleash the capabilities of the smart electricity network.}, language = {en} } @inproceedings{WozniakVauderwangeMandaletal., author = {Wozniak, Peter and Vauderwange, Oliver and Mandal, Avikarsha and Javahiraly, Nicolas and Curticapean, Dan}, title = {Possible applications of the LEAP Motion controller for more interactive simulated experiments in Augmented or Virtual Reality}, series = {Proceedings SPIE Optics Education Outreach}, address = {San Diego}, organization = {SPIE}, doi = {10.1117/12.2237673}, abstract = {Practical exercises are a crucial part of many curricula. Even simple exercises can improve the understanding of the underlying subject. Most experimental setups require special hardware. To carry out e. g. a lens experiments the students need access to an optical bench, various lenses, light sources, apertures and a screen. In our previous publication we demonstrated the use of augmented reality visualization techniques in order to let the students prepare with a simulated experimental setup. Within the context of our intended blended learning concept we want to utilize augmented or virtual reality techniques for stationary laboratory exercises. Unlike applications running on mobile devices, stationary setups can be extended more easily with additional interfaces and thus allow for more complex interactions and simulations in virtual reality (VR) and augmented reality (AR). The most significant difference is the possibility to allow interactions beyond touching a screen. The LEAP Motion controller is a small inexpensive device that allows for the tracking of the user's hands and fingers in three dimensions. It is conceivable to allow the user to interact with the simulation's virtual elements by the user's very hand position, movement and gesture. In this paper we evaluate possible applications of the LEAP Motion controller for simulated experiments in augmented and virtual reality. We pay particular attention to the devices strengths and weaknesses and want to point out useful and less useful application scenarios. © (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.}, language = {en} } @inproceedings{ZirnArndtAschendorffetal., author = {Zirn, Stefan and Arndt, Susan and Aschendorff, Antje and Laszig, Roland and Wesarg, Thomas}, title = {BiCI users' sensitivity to interaural phase differences for single- and multi-channel stimulation}, series = {Abstracts of the 39th annual midwinter meeting}, organization = {Assosiation for Research in Otolaryngologie}, pages = {153}, language = {en} } @inproceedings{ZirnArndtWesarg, author = {Zirn, Stefan and Arndt, Susan and Wesarg, Thomas}, title = {Coding of interaural phase differences in BiCI users}, series = {ISAAR 2015, International Symposium on Auditory and Audiological Research. Proceedings. Vol.5: Individual Hearing Loss - Characterization, Modelling, Compensation Strategies}, publisher = {Danavox Jubilee Foundation}, address = {Ballerup}, isbn = {978-87-990013-5-4}, pages = {341 -- 348}, language = {en} } @inproceedings{ZirnArndtAschendorffetal., author = {Zirn, Stefan and Arndt, Susan and Aschendorff, Antje and Laszig, Roland and Wesarg, Thomas}, title = {Coding and perception of interaural phase differences in BiCI users}, pages = {32}, language = {en} } @inproceedings{DeckerMeier, author = {Decker, Eva and Meier, Barbara}, title = {Schulprojekte zum Einsatz einer Mathe-App als Vorbereitung auf ein MINT-Studium}, series = {Beitr{\"a}ge zum Mathematikunterricht 2016}, organization = {Gesellschaft f{\"u}r Didaktik der Mathematik}, doi = {10.17877/DE290R-17740}, pages = {221 -- 224}, language = {de} } @inproceedings{DaryusiKoehler, author = {Daryusi, Ali and K{\"o}hler, Grit}, title = {Empirische Untersuchungen zum visuellen Wahrnehmen beim Lesen und Verstehen technischer Zeichnungen}, series = {14. Gemeinsames Kolloquium Konstruktionstechnik 2016}, publisher = {Shaker Verlag}, address = {Herzogenrath}, isbn = {978-3-8440-4732-5}, pages = {47 -- 58}, language = {de} } @inproceedings{Daryusi, author = {Daryusi, Ali}, title = {FEM-Berechnung der St{\"u}tzwirkung an Durchdringungskerben}, series = {14. Gemeinsames Kolloquium Konstruktionstechnik (KT), 6. und 7. Oktober 2016 in Rostock}, editor = {Br{\"o}kel, Klaus and Feldhusen, J{\"o}rg and Grote, Karl-Heinrich and Rieg, Frank and Stelzer, Ralph and K{\"o}hler, Peter and M{\"u}ller, Norbert and Scharr, Gerhard}, publisher = {Springer}, address = {Heidelberg, Berlin}, isbn = {978-3-8440-4732-5}, doi = {10.18453/rosdok_id00000136}, pages = {310 -- 319}, abstract = {Der hier vorliegende Beitrag beschreibt die mit der Finite-Elemente-Methode (FEM) gewonnenen Untersuchungsergebnisse zur Bestimmung von St{\"u}tzziffern und Kerbwirkungszahlen bei Getriebewellen. Es handelt sich dabei zum einen um die Kerb{\"u}berlagerung einer umlaufenden Halbkreisnut in Kombination mit {\"u}berlagerter Querbohrung. Da zur Bestimmung der St{\"u}tzwirkungszahlen die Berechnung der bezogenen Spannungsgradienten in Tiefenrichtung ben{\"o}tigt wird, wurden die Parameter der Kerbgeometrie (der Umlaufnutradius sowie der Querbohrungsdurchmesser) variiert. Als Ergebnis dieser Arbeit wurde festgehalten, dass sich die Formzahl infolge der Durchdringungskerbe im Vergleich zur Formzahl einer Einzelkerbe (z. B. Umlaufnut oder Querbohrung) erh{\"o}ht und dementsprechend erh{\"o}ht sich die Kerbwirkungszahl deutlich im Vergleich zu einer Einzelkerbe. Die numerisch erfassten Kerbwirkungszahlen an den erforschten Durchdringungskerben wurden mit analytischen Ans{\"a}tzen aus der Fachliteratur verglichen. Entsprechende Diagramme und Zahlenwerte werden zur Absch{\"a}tzung der Kerbwirkungs- und St{\"u}tzzahlen je nach Belastungsart Torsion, Biegung und Zug/Druck angegeben.}, language = {de} } @inproceedings{Daryusi, author = {Daryusi, Ali}, title = {FEM-Untersuchungen zur optimierten Gestaltung von Profilwellen mit freiem Verzahnungsauslauf}, series = {7. VDI-Fachtagung Welle-Nabe-Verbindungen 2016}, publisher = {VDI-Verlag}, address = {D{\"u}sseldorf}, organization = {VDI}, isbn = {978-3-18-092287-4}, pages = {129 -- 138}, language = {de} } @inproceedings{DaryusiKoehler, author = {Daryusi, Ali and K{\"o}hler, Grit}, title = {Eye-Tracking-Analyse des Betrachtungsverhaltens beim Lesen Technischer Darstellungen}, series = {Ingenieurp{\"a}dagogische Regionaltagung}, publisher = {Hamburg}, address = {Technische Universit{\"a}t}, organization = {TU Hamburg}, isbn = {978-3-9818728-0-4}, pages = {163 -- 170}, language = {de} } @inproceedings{Daryusi, author = {Daryusi, Ali}, title = {FEM-Spannungsanalyse an schr{\"a}ggebohrtem Wellenabsatz}, publisher = {VDI Verlag}, address = {D{\"u}sseldorf}, isbn = {978-3-18-092287-4}, pages = {235 -- 239}, language = {de} } @inproceedings{Sikora, author = {Sikora, Axel}, title = {Security in Ubiquitous Communication}, series = {Wireless Communication and Information : Ubiquitous Communication}, editor = {Sieck, J{\"u}rgen}, publisher = {Verlag Werner H{\"u}lsbusch}, address = {Gl{\"u}ckstadt}, isbn = {978-3-86488-053-7}, pages = {39 -- 52}, language = {en} } @inproceedings{ZahoranskyRiemerFrancketal., author = {Zahoransky, Richard A. and Riemer, Bj{\"o}rn and Franck, David and Hameyer, Kai and Zhitkova, Svetlana}, title = {Hochdrehzahlmotoren f{\"u}r mobile Arbeitsmaschinen}, series = {Hybridantriebe f{\"u}r mobile Arbeitsmaschinen : 4. Fachtagung, 20. Februar 2013, Karlsruhe}, volume = {15}, editor = {Geimer, Marcus and Synek, Peter-Michael}, publisher = {KIT Scientific Publ.}, address = {Karlsruhe}, isbn = {978-3-8664-4970-1}, doi = {10.5445/KSP/1000032265}, pages = {113 -- 123}, language = {de} } @inproceedings{CurticapeanVauderwangeWozniaketal., author = {Curticapean, Dan and Vauderwange, Oliver and Wozniak, Peter and Mandal, Avikarsha}, title = {The International Year of Light 2015 and its impact on educational activities}, series = {SPIE Proceedings}, organization = {SPIE}, pages = {9}, language = {de} } @inproceedings{CurranNavarroAnghilerietal., author = {Curran, James T. and Navarro, Monica and Anghileri, Marco and Closas, Pau and Pfletschinger, Stephan}, title = {Coding Aspects of Secure GNSS Receivers}, series = {IEEE Xplore}, organization = {IEEE}, pages = {1271 -- 1287}, abstract = {This paper presents an overview of the coding aspects of a GNSS receiver. Coding allows detection and correction of channel-induced errors at the receiver, here the focus is on the mitigation of threats from malicious interferences. Although the effects of interference at different stages of GNSS baseband processing has been deeply analyzed in the literature, little attention was devoted to its impact on the navigation message decoding stage. Theis paper provides an introduction to the various coding schemes employed by current GNSS signals, discussing their performance in the presence of noise in terms of block-error rate. Additionally, the benefits of soft-decoding schemes for navigation message decoding are highlighted when jamming interferences are present. The proposed scheme requires estimating the noise plus interference power, yielding to enhanced decoding performances under severe jamming conditions. Finally, cryptographic schemes as a means of providing anti-spoofing for geosecurity location-based services, and their potential vulnerability are discussed, with particular emphasis on the dependence on the dependence of the scheme on successful navigation message decoding}, language = {en} } @inproceedings{CastroKohlerHagen, author = {Castro Kohler, Mariela and Hagen, Tobias}, title = {"IT via ERP": A Novel Approach to Teaching IT Fundamentals to Business Administration students by Means of an Open Source ERP System}, series = {Multikonferenz Wirtschaftsinformatik (MKWI) 2016 : Research-in-Progress- und Poster-Beitr{\"a}ge}, organization = {Technische Universit{\"a}t Illmenau}, pages = {51}, abstract = {First year Business Administration students tend to regard themselves as "non-computer scientists" and often have a lack of motivation about taking IT courses in general, either because they perceive them as too technical, too difficult or somewhat irrelevant. In an attempt to counteract this perception and increase the levels of engagement and willing attendance to class, we decided to flip the traditional lecture model and develop a new teaching and learning approach for the IT Fundamentals course using an open source Enterprise Resource Planning (ERP) system as the platform from which to draw the various underlying IT concepts and through which the relevant competences can be acquired. This paper describes the implementation process of this new contextualized learning framework "IT via ERP" and the changes in the didactical methods to support it.}, language = {en} } @inproceedings{BauerHaasHochbergetal., author = {Bauer, Annika and Haas, Katharina and Hochberg, Ulrich and Zell, Christiane}, title = {Development and Automatization of a Biogas Test Bench for a Membrane based in-situ Methanation of Hydrogen}, pages = {41}, language = {en} } @inproceedings{BaldiBertinelliChiaraluceetal., author = {Baldi, Marco and Bertinelli, Massimo and Chiaraluce, Franco and Closas, Pau and Garello, Roberto and Maturo, Nicola and Navarro, M{\`o}nica and Palomo, Jose Maria and Paolini, Enrico and Pfletschinger, Stephan and Silva, Pedro Freire and Simone, Lorenzo and Vil{\`a}-Valls, Jordi}, title = {NEXCODE: Next Generation Uplink Coding Techniques}, organization = {IEEE}, pages = {8}, language = {en} } @inproceedings{Wendt, author = {Wendt, Thomas}, title = {Reliable Wireless Communications for E-Health}, series = {Proceeding Ad Hoc EHealth open-meeting}, editor = {Antipolis, Sophia}, language = {en} } @inproceedings{WendtVolkMackensen, author = {Wendt, Thomas and Volk, Franziska and Mackensen, Elke}, title = {A benchmark survey of Long Range (LoRaTM) Spread-Spectrum-Communication at 2.45 GHz for safety applications}, series = {Proceedings of the 16th IEEE MTT-S WAMICON, Wireless an Microwave Technology Conference (IEEE WAMICON-2015)}, pages = {1 -- 4}, language = {en} }