informatik-vortraege June 2019

informatik-vortraege@lists.rwth-aachen.de

3 participants
5 discussions

Einladung Informatik-Kolloquium Prof. Richard Fujimoto

by Mirko Stoffers

+********************************************************************** * * * Einladung * * * * Informatik-Kolloquium * * * +********************************************************************** Zeit: Freitag, 5. Juli 2019, 11.30 Uhr Ort: Informatikzentrum, E3, Raum 9007 Referent: Prof. Richard Fujimoto Georgia Institute of Technology, Atlanta Thema: Power Consumption in Parallel and Distributed Simulations Abstract: Energy and power consumption are important concerns for many computing systems ranging from battery-powered embedded and mobile devices to supercomputers and data centers. Although this issue has been extensively studied at the hardware and operating system levels, thus far only a limited amount of work has considered power consumption in parallel and distributed simulations. This presentation addresses this topic and discusses a variety of options to reduce power consumption. Further, parallel and distributed discrete event simulations require a synchronization algorithm to ensure the concurrent execution of the program produces the same results as a sequential execution. The energy consumed by synchronization algorithms for distributed simulation programs is considered, and experimental data presented highlighting that a significant portion of the energy consumed by distributed simulations can be attributed to synchronization. The concept of zero energy synchronization is introduced and techniques to reduce the energy consumed by synchronization algorithms are presented and evaluated. The presentation highlights that many open areas of research concerning power and energy consumption of distributed simulations remain to be explored. Speaker Biography: Richard Fujimoto is a Regents’ Professor in the School of Computational Science and Engineering at the Georgia Institute of Technology. He received the Ph.D. degree from the University of California at Berkeley in 1983. He has been an active researcher in the parallel and distributed simulation field since that time. He led the definition of the time management services in the High Level Architecture for Modeling and Simulation, IEEE standard 1516. His publications include seven award winning papers and he has received the ACM Distinguished Contributions in Modeling and Simulation Award. He has played various leadership roles in a variety of modeling and simulation conferences, journals and other activities. He was the founding chair of the School of Computational Science and Engineering (CSE) at Georgia Tech and established it as an academic unit devoted to the study of computer-based models of natural and engineered systems. In that role he led the creation of the interdisciplinary PhD and MS degree programs in CSE as well as two undergraduate minors. Es laden ein: die Dozentinnen und Dozenten der Informatik

5 years, 3 months

Einladung Informatik-Oberseminar Mirko Stoffers

by Mirko Stoffers

+********************************************************************** * * * Einladung * * * * Informatik-Oberseminar * * * +********************************************************************** Zeit: Freitag, 5. Juli 2019, 15.00 Uhr Ort: Informatikzentrum, E3, Raum 9007 Referent: Mirko Stoffers, M.Sc. Lehrstuhl Informatik 4 (COMSYS) Thema: Automated Optimization of Discrete Event Simulations without Knowing the Model Abstract: Modeling and simulation is an essential element in the research and development of new concepts and products in any domain. The demand for the development of more and more complex systems drives the complexity of the simulation models as well, which in turn urges the research of methodologies to reduce the execution times down to a feasible amount. We identified two major types of resources that can be exploited for acceleration: On the one hand, multiple computing instances (e. g., CPU cores) can be used to distribute the workload and perform independent computations simultaneously. On the other hand, workload stemming from redundant computations can be avoided altogether by exploiting the presence of unused main memory to store intermediate results. We observe that typically in the development cycle of products and simulation models neither time and resources nor required expertise is available to apply sophisticated runtime optimization manually. We conclude that it is of utmost importance to investigate approaches to speed up simulation automatically. The most prevalent challenge of automating optimization is that, at the time of researching and developing the acceleration concepts and tools, the model is not yet available, and we need to assume that the model will not be implemented for a specific optimization technique. Hence, our methodologies need to be devised without the model at hand, which can only be used by the finally implemented optimization tool at its runtime. In this talk, we discuss how computer simulations can be automatically accelerated using either of the two optimization potentials mentioned above (multiple computing instances or available memory) without the model being provided at the time of researching the concepts and developing the tools. Finally, we discuss how by combining the two optimization vectors the full power of both can be unleashed at the same time. Es laden ein: die Dozentinnen und Dozenten der Informatik

5 years, 3 months

[Vision-assistants] [Informatik-assistenten] Einladung: Informatik Oberseminar Aljosa Osep

by Aljosa Osep

+********************************************************************** * * * Einladung * * * * Informatik-Oberseminar * * * +********************************************************************** Zeit: Donnerstag, 27. Juni 2019, 9:30 Uhr Ort: UMIC Research Centre, room 025, Mies-van-der-Rohe Strasse 15 Referent: Aljosa Osep, MSc., Lehrstuhl Informatik 8 (Computer Vision) Thema: Vision-based Category-Agnostic Object Tracking for Mobile Robots and Intelligent Vehicles Abstract: The majority of existing vision-based methods perform multi-object tracking in the image domain. Yet, in mobile robotics and autonomous driving scenarios, pixel-precise object localization and trajectory estimation in 3D space are of fundamental importance. Furthermore, the leading paradigms for vision-based multi-object tracking and trajectory prediction rely heavily on object detectors and effectively limit tracking and motion prediction to a set of predefined classes, while the set of object classes that appear in the real-world is unbounded. In this talk I will present novel methods for vision-based, category-agnostic multi-object tracking that overcome this limitation. The Category-Agnostic Multi-Object Tracker (CAMOT) leverages recent developments in the area of learning-based object proposal generation and lifts image-based proposal estimates to 3D space in order to estimate trajectories of arbitrary objects. We further extend CAMOT for the task of video-object proposal generation and demonstrate that by utilizing motion and parallax as consistency filters, can robustly track known and unknown objects and mine large video collections. I will conclude my talk by demonstrating how such a video-object mining approach can be used for video-object discovery and self-supervised object detector learning. Es laden ein: die Dozentinnen und Dozenten der Informatik _______________________________________________ Informatik-assistenten mailing list -- informatik-assistenten(a)lists.rwth-aachen.de To unsubscribe send an email to informatik-assistenten-leave(a)lists.rwth-aachen.de https://lists.rwth-aachen.de/postorius/lists/informatik-assistenten.lists.r… _______________________________________________ Vision-assistants mailing list -- vision-assistants(a)lists.rwth-aachen.de To unsubscribe send an email to vision-assistants-leave(a)lists.rwth-aachen.de https://lists.rwth-aachen.de/postorius/lists/vision-assistants.lists.rwth-a…

5 years, 3 months

[Vision-assistants] [Informatik-assistenten] Einladung: Informatik Oberseminar Prof. Dr. David Held, Carnegie Mellon University

by Aljosa Osep

+********************************************************************** * * * Einladung * * * * Informatik-Oberseminar * * * +********************************************************************** Zeit: Donnerstag, 27. Juni 2019, 14.15 Uhr Ort: UMIC Research Centre, room 025, Mies-van-der-Rohe Strasse 15 Referent: Prof. Dr. David Held, The Robotics Institute, Carnegie Mellon University Thema: Uncertainty-Aware Perceptual Robot Learning Abstract: Robot learning systems need to deal with perceptual uncertainty, due to a variety of factors such as occlusions, sensor noise, small objects, limited capacity models, and novel objects. We believe that perceptual systems should be aware of their uncertainty and that decision-making algorithms should incorporate such uncertainty. We present three current directions for achieving this. First, we present an object instance detection system that combines machine learning with correspondence matching to verify the proposed detections and reject uncertain detections. Next, we show an approach for estimate a distribution over orientation uncertainty by augmenting any deep pose estimation system. Last, we present an approach for reinforcement learning with deformable objects that does not assume access to the ground-truth state. Together, these directions represent our current approach to dealing with perceptual uncertainty in robot learning systems. Es laden ein: die Dozentinnen und Dozenten der Informatik _______________________________________________ Informatik-assistenten mailing list -- informatik-assistenten(a)lists.rwth-aachen.de To unsubscribe send an email to informatik-assistenten-leave(a)lists.rwth-aachen.de https://lists.rwth-aachen.de/postorius/lists/informatik-assistenten.lists.r… _______________________________________________ Vision-assistants mailing list -- vision-assistants(a)lists.rwth-aachen.de To unsubscribe send an email to vision-assistants-leave(a)lists.rwth-aachen.de https://lists.rwth-aachen.de/postorius/lists/vision-assistants.lists.rwth-a…

5 years, 3 months

Einladung Informatik-Oberseminar Torsten Zimmermann

by Torsten Zimmermann

+********************************************************************** * * * Einladung * * * * Informatik-Oberseminar * * * +********************************************************************** Zeit: Dienstag, 2. Juli 2019, 11.30 Uhr Ort: Seminarraum 9007, Gebäude E3, Ahornstr. 55 Referent: Torsten Zimmermann, M.Sc. Lehrstuhl Informatik 4 Thema: Improving Content and Service Distribution beyond Infrastructure Upgrades Abstract: The Internet has evolved into an essential platform for communication and access to information. This manifests itself in the steadily growing traffic due to rising user demands for content and services. However, these demands put pressure on operators to constantly improve performance and availability, e.g., by upgrading infrastructures. Despite these efforts, there are limits to upgrades and their impact, ranging from technical to economic aspects. To still achieve improvements, research also focuses on other aspects of content and service distribution, including protocol optimization, better infrastructure utilization, and approaches to overcome limited infrastructure support. However, these optimizations can have unknown consequences in real-world deployments. Even if protocols underwent a rigorous standardization process, their adoption and impact are often unpredictable. The same holds for approaches that support infrastructures, which face practical challenges when deployed outside of testbeds, e.g., missing user acceptance due to the lack of control. Overcoming these challenges is relevant to achieve improvements beyond the current state-of-the-art solutions. In this talk, we approach the problem of how to provide improvements for content and service distribution beyond infrastructure upgrades from the aforesaid viewpoints: the deployment of a new protocol and the applicability of supporting approaches. We provide the first large-scale adoption study of HTTP/2, as the new standard protocol for the Web, and especially focus on its promising new feature Server Push. Despite being considered a key feature of HTTP/2, we observe that its use does not always lead to improvements, but also to human-perceivable detrimental effects, which we verified in a user study. Building on this, we further inspect which factors influence performance and provide a novel strategy for the use of this feature, which can lead to significant performance improvements. Focusing on how to support infrastructures, we present an approach that enables roaming mobile users to connect to private Access Points, using provider-assisted authentication and the creation of an on-demand single purpose network. By that, we provide connectivity in case other infrastructures, such as the cellular network, are temporarily not available. Finally, we provide a brief outlook on how to realize content distribution between devices with only limited infrastructure support. In summary, our contributions provide valuable insights and practical technical solutions that complement infrastructure-based improvements. Es laden ein: die Dozentinnen und Dozenten der Informatik

5 years, 3 months

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informatik-vortraege June 2019