October 2015 - Kolloq - lists.ibr.cs.tu-bs.de

Vortrag am 10.11.2015, 16:30 Uhr
by Informatik-Kolloquium 27 Oct '15

27 Oct '15

Die Dozenten der Informatik-Institute der Technischen Universität Braunschweig laden im Rahmen des Informatik-Kolloquiums zu folgendem Vortrag ein. Ahmad Dehwah, PhD Candidate in the Electrical Engineering at King Abdullah University of Science and Technology: Energy Aware Routing Schemes in Solar Powered Wireless Sensor Networks for Flash Flood and Traffic Monitoring Applications Beginn: 10.11.2015, 16:30 Uhr Ort: TU Braunschweig, Informatikzentrum, Mühlenpfordtstraße 23, 1. OG, Hörsaal M 161 Webseite: http://www.ibr.cs.tu-bs.de/cal/kolloq/2015-11-10-dehwah.html Kontakt: Prof. Dr.-Ing. Lars Wolf Wireless sensor networks have enabled the existence of many accurate and inexpensive monitoring systems that could help in saving people lives as well as monitoring the environment. Nevertheless, having a long term operational network is associated with multiple challenges especially for critical and emergency applications. Our focus is on real-time traffic monitoring and flash flood detection system using solar powered wireless sensor networks. As a real-time application, system reliability and energy management is critical to ensure the system operation thus, we consider data routing policies in order to optimize the energy. Motivated by multi-purpose sensor networks, the objective is to find the best network policy that maximizes the minimal energy among nodes in a sensor network, over a finite time horizon, given uncertain energy input forecasts. We first show the derivation of the Mixed Integer Linear Programming (MILP) counterpart for solving the problem in a centralized manner. Then we drive the optimal policy that maximizes our specific problem over some time horizon using forward dynamic programming. Finally, we present a derivation for the proposed greedy policy that is distributed, and exhibits significantly lower complexity with a computational time that outperforms both aforementioned approaches along with the experimental validation.

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Erinnerung: Vortrag am 20.10.2015, 10:00 Uhr
by Informatik-Kolloquium 19 Oct '15

19 Oct '15

Die Dozenten der Informatik-Institute der Technischen Universität Braunschweig laden im Rahmen des Informatik-Kolloquiums zu folgendem Vortrag ein. Dr. Michael Hardegger: The Future of Context-Awareness: How wearables can learn about us and our environment at run-time Beginn: 20.10.2015, 10:00 Uhr Ort: TU Braunschweig, Informatikzentrum, Mühlenpfordtstraße 23, 1. OG, Hörsaal M 161 Webseite: http://www.ibr.cs.tu-bs.de/cal/kolloq/2015-10-20-hardegger.html Kontakt: Prof. Dr.-Ing. Marcus A. Magnor Existing context-aware wearables typically directly associate signal patterns to a user’s context, without taking into account previous activities or the person’s location. However, such complementary information may influence the significance of a signal pattern, improve the performance in recognizing context, and enable more fine-grained distinction of activities. The challenge is to achieve such state-aware context recognition from wearables only, i.e., without being dependent on pre-installed infrastructure or the training of complex classifiers. In this talk, we introduce the concept of semantic maps as environment representation for context-aware assistants in daily life. Semantic maps describe the location and state of objects, e. g., open windows, running water taps or closed doors. Such maps can be used to infer higher-level activities of an inhabitant, and to constrain his location within the environment. We discuss a Bayesian filter framework that builds such maps from the data of wearables and in return estimates the person’s position within the map, without the need for any pre-installed localization infrastructure. By continuously adding new information to the semantic map, this proposed framework accumulates knowledge about the place in a self-learning manner. We demonstrate the potential of this tool in real-world settings, where we monitor people during their daily life at home, without having to install any infrastructure in the building. Such a system can be deployed efficiently and without professional support. Furthermore, the introduction of semantic maps as state argument in context-awareness is a major step towards advanced monitoring tools and wearable assistants in medicine, sports and daily-life applications. This talk will presents working prototypes, including the first smartphone-based localization system that robustly tracks people over a long time, using motion data only.

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Erinnerung: Vortrag am 19.10.2015, 15:00 Uhr
by Informatik-Kolloquium 18 Oct '15

18 Oct '15

Die Dozenten der Informatik-Institute der Technischen Universität Braunschweig laden im Rahmen des Informatik-Kolloquiums zu folgendem Vortrag ein. Dr. Fang-Jing Wu: >From Wireless Sensor Networks towards Smart Cities Beginn: 19.10.2015, 15:00 Uhr Ort: TU Braunschweig, Informatikzentrum, Mühlenpfordtstraße 23, 1. OG, Hörsaal M 161 Webseite: http://www.ibr.cs.tu-bs.de/cal/kolloq/2015-10-19-wu.html Kontakt: Prof. Dr.-Ing. Marcus A. Magnor Wireless sensor networks and intelligent sensing technologies have boosted many promising smart-city applications which provide diverse ambient intelligence for understanding city dynamics and improving human well-being. This talk will systematically review some research activities and technical evolution from conventional WSNs towards smart-city technologies including static and dynamic wireless networking and communications, wearable computing, mobile sensing, crowdsourcing, and data analytics. Through these reviews, we will demonstrate how these sensor-assisted applications exploit the information collected by WSNs wearable devices, smartphones, and crowdsourcing systems to bridge the cyber and the physical worlds.

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Erinnerung: Vortrag am 19.10.2015, 13:00 Uhr
by Informatik-Kolloquium 18 Oct '15

18 Oct '15

Die Dozenten der Informatik-Institute der Technischen Universität Braunschweig laden im Rahmen des Informatik-Kolloquiums zu folgendem Vortrag ein. Dr. Jingyuan Cheng: Smart Textile for Wearable and Ubiquitous Computing Beginn: 19.10.2015, 13:00 Uhr Ort: TU Braunschweig, Informatikzentrum, Mühlenpfordtstraße 23, 1. OG, Hörsaal M 161 Webseite: http://www.ibr.cs.tu-bs.de/cal/kolloq/2015-10-19-cheng.html Kontakt: Prof. Dr.-Ing. Marcus A. Magnor Textile enjoys a high coverage rate both time-wise and space-wise in everyone’s life. Utylizing this “worn by default”, smart textile becomes a unique resource for information retrieval and feedback in (not only) wearable computing. This talk presents mainly 3 novel sensing and feedback modalities using texile and their application for some key topics in wearable and ubiquitous computing, including: human computer interface, monitoring activities of daily living, nutrition, sport and etc.

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Abgesagt: Vortrag am 16.10.2015, 15:00 Uhr
by Informatik-Kolloquium 14 Oct '15

14 Oct '15

Der Vortragende kann aus privaten GrÃ¼nden nicht nach Deutschland kommen. Der Vortrag fÃ¤llt leider aus. Die Dozenten der Informatik-Institute der Technischen Universität Braunschweig machen darauf aufmerksam, dass der folgende Vortrag leider ausfallen muss. Sollte der Vortrag zu einem späteren Zeitpunkt stattfinden, wird er erneut angekündigt. Daniel Martí, F-Droid Project: F-Droid: Android without Google Play Beginn: 16.10.2015, 15:00 Uhr (fällt aus!) Ort: TU Braunschweig, Informatikzentrum, Mühlenpfordtstraße 23, 1. OG, Hörsaal M 161 Webseite: http://www.ibr.cs.tu-bs.de/cal/kolloq/2015-10-16-marti.html Kontakt: Dominik Schürmann Der Vortragende kann aus privaten Gründen nicht nach Deutschland kommen. Der Vortrag fällt leider aus. F-Droid is an app distribution platform for Android. It is based on the repository system known from Linux distros - anyone can set up a repository with apps, and users can download and install apps from it. The main difference between F-Droid and other app stores alternative to Google Play is that F-Droid is completely Free Software. This makes the project a key component of Android as an open source and decentralized system. Our main repository has over 1,500 apps with more than 60,000 regular users. This talk will mainly focus on how the Android client is written and all the challenges it faces. For example: How do you make it scale to thousands of apps at a time? How can you make it light on network usage? How can you keep it secure? How can it be a package manager on its own? (regular apps can't do this)

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Terminaenderung: Vortrag am 13.10.2015, 13:30 Uhr
by Informatik-Kolloquium 12 Oct '15

12 Oct '15

Die Dozenten der Informatik-Institute der Technischen Universität Braunschweig laden im Rahmen des Informatik-Kolloquiums zu folgendem Vortrag ein. Dipl.-Ing. Dr. Clemens Heitzinger, Associate Professor, Institute for Analysis and Scientific Computing, TU Wien: Stochastic partial differential equations, multiscale problems, and applications in nanotechnology Beginn: 13.10.2015, 13:30 Uhr Ort: TU Braunschweig, Informatikzentrum, Mühlenpfordtstraße 23, 8. OG, Seminarraum 812 Webseite: http://www.ibr.cs.tu-bs.de/cal/kolloq/2015-10-13-heitzinger.html Kontakt: Prof. Hermann G. Matthies, PhD Stochastic partial differential equations are becoming increasingly important to quantify uncertainties, noise, fluctuations, and process variations. Various results regarding multiscale problems, stochastic multiscale problems, existence, uniqueness, and regularity of solutions are presented for important model equation such as the stochastic Poisson equation, the stochastic nonlinear Poisson-Boltzmann equation, and the stochastic drift-diffusion-Poisson system. The development of efficient numerical methods will also be discussed: In particular, we present a multi-level Monte-Carlo method for the stochastic drift-diffusion-Poisson, basis adaptation for the Poisson-Boltzmann equation, and a non-intrusive stochastic Galerkin method for the Poisson-Boltzmann equation. Finally, simulation results for realistic structures are shown. The model equations and stochastic processes are motivated by applications in nanotechnology (such as nanowire bio- and gas sensors as well as nanoscale transistors) and materials science. These simulations are important for the rational design of nanoscale sensors and other devices.

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Erinnerung: Vortrag am 13.10.2015, 14:00 Uhr
by Informatik-Kolloquium 12 Oct '15

12 Oct '15

Die Dozenten der Informatik-Institute der Technischen Universität Braunschweig laden im Rahmen des Informatik-Kolloquiums zu folgendem Vortrag ein. Dipl.-Ing. Dr. Clemens Heitzinger, Associate Professor, Institute for Analysis and Scientific Computing, TU Wien: Stochastic partial differential equations, multiscale problems, and applications in nanotechnology Beginn: 13.10.2015, 14:00 Uhr Ort: TU Braunschweig, Informatikzentrum, Mühlenpfordtstraße 23, 8. OG, Seminarraum 812 Webseite: http://www.ibr.cs.tu-bs.de/cal/kolloq/2015-10-13-heitzinger.html Kontakt: Prof. Hermann G. Matthies, PhD Stochastic partial differential equations are becoming increasingly important to quantify uncertainties, noise, fluctuations, and process variations. Various results regarding multiscale problems, stochastic multiscale problems, existence, uniqueness, and regularity of solutions are presented for important model equation such as the stochastic Poisson equation, the stochastic nonlinear Poisson-Boltzmann equation, and the stochastic drift-diffusion-Poisson system. The development of efficient numerical methods will also be discussed: In particular, we present a multi-level Monte-Carlo method for the stochastic drift-diffusion-Poisson, basis adaptation for the Poisson-Boltzmann equation, and a non-intrusive stochastic Galerkin method for the Poisson-Boltzmann equation. Finally, simulation results for realistic structures are shown. The model equations and stochastic processes are motivated by applications in nanotechnology (such as nanowire bio- and gas sensors as well as nanoscale transistors) and materials science. These simulations are important for the rational design of nanoscale sensors and other devices.

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Erinnerung: Vortrag am 08.10.2015, 14:00 Uhr
by Informatik-Kolloquium 07 Oct '15

07 Oct '15

Die Dozenten der Informatik-Institute der Technischen Universität Braunschweig laden im Rahmen des Informatik-Kolloquiums zu folgendem Vortrag ein. Dr. Miljan Milosevic, Research Associate at Bioengineering Research and Development Center, BioIRC Kragujevac, Serbia, and Assistant Professor at Belgrade Metropolitan University: A multi-scale FE model for convective-diffusive transport within tumor and vascular networks Beginn: 08.10.2015, 14:00 Uhr Ort: TU Braunschweig, Informatikzentrum, Mühlenpfordtstraße 23, 8. OG, Seminarraum 812 Webseite: http://www.ibr.cs.tu-bs.de/cal/kolloq/2015-10-08-milosevic.html Kontakt: Prof. Hermann G. Matthies, PhD Mass transport within an organ occurs through networks of blood vessels and surrounding tissue. This convective-diffusive transport is a very complex process which spans several different scales, from nano- to micro- to macro-scale. The blood vessel network is usually very intricate and irregular with respect to size and geometry, with mass transport being directly coupled to the neighboring tissue. Due to such complexity, development of a comprehensive transport model remains a challenge. The primary focus of this study is on solid tumors which are extremely complex autonomous systems with regard to mass transport. Additionally, tumors develop various biological barriers which hinder effective delivery of drug molecules into cancer tissue. We introduce a multi-scale tumor transport model where larger tumor vessels are modeled by simple 1D finite elements, whereas the capillary bed is replaced by equivalent 3D continuum finite elements. The model couples convective-diffusive transport within capillaries (fluid domain) and tissue (solid domain). These fluid and solid domains are connected by fictitious 1D elements. The proposed tumor model incorporates the imaged inhomogeneous tumor tissue and blood vessel network - from larger vessels to the smallest capillary bed. The tumor model is also applicable to transport within organs, such as the mouse brain, which is presented here as an example.

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Vortrag am 13.10.2015, 14:00 Uhr
by Informatik-Kolloquium 07 Oct '15

07 Oct '15

Die Dozenten der Informatik-Institute der Technischen Universität Braunschweig laden im Rahmen des Informatik-Kolloquiums zu folgendem Vortrag ein. Dipl.-Ing. Dr. Clemens Heitzinger, Associate Professor, Institute for Analysis and Scientific Computing, TU Wien: Stochastic partial differential equations, multiscale problems, and applications in nanotechnology Beginn: 13.10.2015, 14:00 Uhr Ort: TU Braunschweig, Informatikzentrum, Mühlenpfordtstraße 23, 8. OG, Seminarraum 812 Webseite: http://www.ibr.cs.tu-bs.de/cal/kolloq/2015-10-13-heitzinger.html Kontakt: Prof. Hermann G. Matthies, PhD Stochastic partial differential equations are becoming increasingly important to quantify uncertainties, noise, fluctuations, and process variations. Various results regarding multiscale problems, stochastic multiscale problems, existence, uniqueness, and regularity of solutions are presented for important model equation such as the stochastic Poisson equation, the stochastic nonlinear Poisson-Boltzmann equation, and the stochastic drift-diffusion-Poisson system. The development of efficient numerical methods will also be discussed: In particular, we present a multi-level Monte-Carlo method for the stochastic drift-diffusion-Poisson, basis adaptation for the Poisson-Boltzmann equation, and a non-intrusive stochastic Galerkin method for the Poisson-Boltzmann equation. Finally, simulation results for realistic structures are shown. The model equations and stochastic processes are motivated by applications in nanotechnology (such as nanowire bio- and gas sensors as well as nanoscale transistors) and materials science. These simulations are important for the rational design of nanoscale sensors and other devices.

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Vortrag am 08.10.2015, 14:00 Uhr
by Informatik-Kolloquium 07 Oct '15

07 Oct '15

Die Dozenten der Informatik-Institute der Technischen Universität Braunschweig laden im Rahmen des Informatik-Kolloquiums zu folgendem Vortrag ein. Dr. Miljan Milosevic, Research Associate at Bioengineering Research and Development Center, BioIRC Kragujevac, Serbia, and Assistant Professor at Belgrade Metropolitan University: A multi-scale FE model for convective-diffusive transport within tumor and vascular networks Beginn: 08.10.2015, 14:00 Uhr Ort: TU Braunschweig, Informatikzentrum, Mühlenpfordtstraße 23, 8. OG, Seminarraum 812 Webseite: http://www.ibr.cs.tu-bs.de/cal/kolloq/2015-10-08-milosevic.html Kontakt: Prof. Hermann G. Matthies, PhD Mass transport within an organ occurs through networks of blood vessels and surrounding tissue. This convective-diffusive transport is a very complex process which spans several different scales, from nano- to micro- to macro-scale. The blood vessel network is usually very intricate and irregular with respect to size and geometry, with mass transport being directly coupled to the neighboring tissue. Due to such complexity, development of a comprehensive transport model remains a challenge. The primary focus of this study is on solid tumors which are extremely complex autonomous systems with regard to mass transport. Additionally, tumors develop various biological barriers which hinder effective delivery of drug molecules into cancer tissue. We introduce a multi-scale tumor transport model where larger tumor vessels are modeled by simple 1D finite elements, whereas the capillary bed is replaced by equivalent 3D continuum finite elements. The model couples convective-diffusive transport within capillaries (fluid domain) and tissue (solid domain). These fluid and solid domains are connected by fictitious 1D elements. The proposed tumor model incorporates the imaged inhomogeneous tumor tissue and blood vessel network - from larger vessels to the smallest capillary bed. The tumor model is also applicable to transport within organs, such as the mouse brain, which is presented here as an example.

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