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Computational Self-Awareness as Design Approach for Visual Sensor Nodes

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Computational Self-Awareness as Design Approach for Visual S...

International Symposium on Reconfigurable and Communication-Centric systems-on-Chip

作者： Zakarya Guettatfi Philipp Hubner Marco Platzner Bernhard Rinner Computer Science Department Paderborn University Germany Institute of Networked and Embedded Systems Alpen-Adria-Universit?t Klagenfurt Austria

Visual sensor networks (VSNs) represent distributed embedded systems with tight constraints on sensing, processing, memory, communications and power consumption. VSNs are expected to scale up in the number of nodes, be required to offer more complex functionality, a higher degree of flexibility and increased autonomy. The engineering of such VSNs capable of (self-)adapting on the application and platform levels poses a formidable challenge. In this paper, we introduce a novel design approach for visual sensor nodes which is founded on computational self-awareness. Computational self-awareness maintains knowledge about the system's state and environment with models and then uses this knowledge to reason about and adapt behaviours. We discuss the concept of computational self-awareness and present our novel design approach that is centred on a reference architecture for individual VSN nodes, but can be naturally extended to networks. We present the VSN node implementation with its platform architecture and resource adaptivity and report on preliminary implementation results of a Zynq-based VSN node prototype.

关键词： Reconfigurable platforms Visual sensor nodes Self-awareness distributed embedded systems Performance-resource trade-off

SensX: About sensing and assessment of complex human motion

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arXiv 2017年

作者： Ebert, André Kiermeier, Marie Marouane, Chadly Linnhoff-Popien, Claudia Mobile and Distributed Systems Group Institute for Computer Science Ludwig-Maximilians-University Munich Oettingenstr. 67 Munich80538 Germany

The great success of wearables and smartphone apps for provision of extensive physical workout instructions boosts a whole industry dealing with consumer oriented sensors and sports equipment. But with these opportunities there are also new challenges emerging. The unregulated distribution of instructions about ambitious exercises enables unexperienced users to undertake demanding workouts without professional supervision which may lead to suboptimal training success or even serious injuries. We believe, that automated supervision and realtime feedback during a workout may help to solve these issues. Therefore we introduce four fundamental steps for complex human motion assessment and present SensX, a sensor-based architecture for monitoring, recording, and analyzing complex and multi-dimensional motion chains. We provide the results of our preliminary study encompassing 8 different body weight exercises, 20 participants, and more than 9,220 recorded exercise repetitions. Furthermore, insights into SensXs classification capabilities and the impact of specific sensor configurations onto the analysis process are given. Copyright © 2017, The Authors. All rights reserved.

关键词： Wearable sensors

Segmented and directional impact detection for parked vehicles using mobile devices

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arXiv 2017年

作者： Ebert, André Feld, Sebastian Dorfmeister, Florian Mobile and Distributed Systems Group Institute for Computer Science Ludwig-Maximilians-University Munich Oettingenstr. 67 Munich80538 Germany

Mutual usage of vehicles as well as car sharing became more and more attractive during the last years. Especially in urban environments with limited parking possibilities and a higher risk for traffic jams, car rentals and sharing services may save time and money. But when renting a vehicle it could already be damaged (e.g., scratches or bumps inflicted by a previous user) without the damage being perceived by the service provider. In order to address such problems, we present an automated, motion-based system for impact detection, that facilitates a common smartphone as a sensor platform. The system is capable of detecting the impact segment and the point of time of an impact event on a vehicle's surface, as well as its direction of origin. With this additional specific knowledge, it may be possible to reconstruct the circumstances of an impact event, e.g., to prove possible innocence of a service's customer. Copyright © 2017, The Authors. All rights reserved.

关键词： Vehicles

Automated continuous evaluation of AUTOSAR software architecture for complex powertrain systems 47

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Automated continuous evaluation of AUTOSAR software architec...

47. Jahrestagung der Gesellschaft fur Informatik, Informatik 2017 - 47th Annual Meeting of the German Informatics Society (GI), Informatics 2017

作者： Venkitachalam, Hariharan Powale, Kalkin Granrath, Christian Richenhagen, Johannes RWTH Aachen Institute for Combustion Engines Forckenbeckstrasse Aachen52074 Germany TU Chemnitz Department of Computer Science Strasse der Nationen 62 Chemnitz09111 Germany RWTH Aachen University Institute for Combustion Engines Forckenbeckstrasse Aachen52074 Germany FEV GmbH Embedded Software Systems Neuenhofstrasse 181 Aachen52078 Germany

ISBN: (纸本)9783885796695

Connectivity of the vehicle to heterogeneous information sources is one of the key factors which lead to complexity of automotive software architecture. The information content from external communication sources modifies the structure, content and the synchronization of control algorithms. In addition to this, time and cost constraints for software development are challenging. With increasing complexity and reduction of development time, ensuring software quality is one of the foremost priorities of vehicle manufacturers. Software architecture plays an important role in ensuring quality by implementing design principles which enhance non-functional quality attributes of the automotive software. The extent to which a software architecture definition fulfills the quality requirements is not verified at early stages of development. As a consequence, design problems are transferred to later stages of development thereby causing rework of software artifacts. The paper focuses on a tool-based evaluation of non-functional quality characteristics using the concept of Continuous Integration for AUTOSAR-based transmission control software. The suggested approach enables early and continuous evaluation of software architecture thereby improving software quality. © 2017 Gesellschaft fur Informatik (GI). All rights reserved.

关键词： Software design

Inter-Connected Power System Frequency Stability with Wind Penetration by Using Fuzzy-GrHDP

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Inter-Connected Power System Frequency Stability with Wind P...

IEEE Power and Energy Society General Meeting

作者： Yufei Tang Haibo He Institute for Sensing and Embedded Network Systems Engineering Department of Computer & Electrical Engineering and Computer Science Florida Atlantic University Department of Electrical Engineering University of Rhode Island

ISBN: (纸本)9781538622131;9781538622124

Increased deployment of wind generation, with the characteristics of randomness and intermittent, has adverse effects on inter-connected power system frequency stability. By considering wind power deviation, this paper improves the area control error (ACE) model to address the frequency fluctuation caused by wind disturbances. Specifically, new control variables are introduced into the ACE model, therefore to provide much more informative inputs for the automatic generation control (AGC) system. Based on this ACE model, two intelligent control methods are proposed and compared. The first method is fuzzy logic based PI controller, in which the parameters are updated according to the range of frequency offset. The other method is fuzzy logic based goal representation heuristic dynamic programming (Fuzzy-GrHDP), in which adaptive supplementary control signals are generated in an online manner. Simulation study is carried out on a two-area benchmark system with wind power penetration. The simulation results demonstrate the effectiveness of the proposed methods for frequency oscillation damping under different system operating conditions.

关键词： Wind power generation Frequency control Generators Power system stability Automatic generation control Frequency modulation

SPECTRE: Supporting consumption policies in window-based parallel complex event processing

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arXiv 2017年

作者： Mayer, Ruben Slo, Ahmad Tariq, Muhammad Adnan Rothermel, Kurt Gräber, Manuel Ramachandran, Umakishore Institute of Parallel and Distributed Systems University of Stuttgart Department of Computer Science Fast - National University of Computer and Emerging Sciences Islamabad Pakistan College of Computing Georgia Institute of Technology United States

distributed Complex Event Processing (DCEP) is a paradigm to infer the occurrence of complex situations in the surrounding world from basic events like sensor readings. In doing so, DCEP operators detect event patterns on their incoming event streams. To yield high operator throughput, data parallelization frameworks divide the incoming event streams of an operator into overlapping windows that are processed in parallel by a number of operator instances. In doing so, the basic assumption is that the different windows can be processed independently from each other. However, consumption policies enforce that events can only be part of one pattern instance;then, they are consumed, i.e., removed from further pattern detection. That implies that the constituent events of a pattern instance detected in one window are excluded from all other windows as well, which breaks the data parallelism between different windows. In this paper, we tackle this problem by means of speculation: Based on the likelihood of an event's consumption in a window, subsequent windows may speculatively suppress that event. We propose the SPECTRE framework for speculative processing of multiple dependent windows in parallel. Our evaluations show an up to linear scalability of SPECTRE with the number of CPU cores. Copyright © 2017, The Authors. All rights reserved.

关键词： Data handling

Eunomia: Scaling Concurrent Search Trees under Contention Using HTM

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ACM SIGPLAN Notices 2017年第8期52卷 385-399页

作者： Wang, Xin Zhang, Weihua Wang, Zhaoguo Wei, Ziyun Chen, Haibo Zhao, Wenyun Software School Fudan University China Shanghai Key Laboratory of Data Science Fudan University School of Computer Science Fudan University China Institute of Parallel and Distributed Systems Shanghai Jiao Tong University China Computer Science Department New York University United States

While hardware transactional memory (HTM) has recently been adopted to construct efficient concurrent search tree structures, such designs fail to deliver scalable performance under contention. In this paper, we first conduct a detailed analysis on an HTM-based concurrent B+Tree, which uncovers several reasons for excessive HTM aborts induced by both false and true conflicts under contention. Based on the analysis, we advocate Eunomia, a design pattern for search trees which contains several principles to reduce HTM aborts, including splitting HTM regions with version-based concurrency control to reduce HTM working sets, partitioned data layout to reduce false conflicts, proactively detecting and avoiding true conflicts, and adaptive concurrency control. To validate their effectiveness, we apply such designs to construct a scalable concurrent B+Tree using HTM. Evaluation using key-value store benchmarks on a 20-core HTM-capable multi-core machine shows that Eunomia leads to 5X-11X speedup under high contention, while incurring small overhead under low contention. © 2017 ACM.

关键词： Concurrency control

Non-uniform time-scaling of carnatic music transients

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arXiv 2017年

作者： Viraraghavan, Venkata Subramanian Pal, Arpan Aravind, R. Murthy, Hema TCS Research and Innovation Embedded Systems and Robotics Bangalore India Department of Electrical Engineering Indian Institute of Technology Madras Singapore Department of Computer Science and Engineering Indian Institute of Technology Madras India

Gamakas are an integral aspect of Carnatic Music, a form of classical music prevalent in South India. They are used in rāgas, which may be seen as melodic scales and/or a set of characteristic melodic phrases. Gamakas exhibit continuous pitch variation often spanning several semitones. In this paper, we study how gamakas scale with tempo and propose a novel approach to change the tempo of Carnatic music pieces. The music signal is viewed as consisting of constant-pitch segments and transients. The transients show continuous pitch variation and we consider their analyses from a theoretical stand-point. We next observe the non-uniform ratios of time-scaling of constantpitch segments, transients and silence in excerpts from nine concert renditions of varn. ams in six rāgas. The results indicate that the changing tempo of Carnatic music does not change the duration of transients significantly. We report listening tests on our algorithm to slow down Carnatic music that is consistent with this observation. Copyright © 2017, The Authors. All rights reserved.

关键词： Music

Near-Space Aerospace Vehicles Attitude Control Based on Adaptive Dynamic Programming and Sliding Mode Control

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Near-Space Aerospace Vehicles Attitude Control Based on Adap...

International Joint Conference on Neural Networks

作者： Yufei Tang Chaoxu Mu Haibo He Department of Computer & Electrical Engineering and Computer Science and the Institute for Sensing and Embedded Network Systems Engineering Florida Atlantic University School of Electrical Engineering and Automation Tianjin University Department of Electrical Computer and Biomedical Engineering University of Rhode Island

ISBN: (纸本)9781509061839

In this paper, coordinated sliding mode control (SMC) and adaptive dynamic programming (ADP) strategy is proposed for near-space aerospace vehicle (NSASV) adaptive attitude tracking control. In this design, the NSASV attitude angle control is implemented as classical cascade control scheme with two control loops in the model. The outer one is a slow control loop for the attitude angle tracking, and the inner one is a fast control loop for the attitude angular rate tracking. Both of these two control loops are designed by using SMC, which can provide exact control performance near the operating point. To improve the control performance and robustness under parameter variations and external disturbances, ADP based supplementary control is introduced and incorporated into the inner fast control loop to provide adaptive compensation for the reference signal. Simulation study is carried out in Matlab/Simulink environment, and the results demonstrate that the proposed cooperative control could provide quite satisfied tracking performance in terms of overshoot and oscillation.

关键词： Attitude control Dynamics Adaptation models Vehicle dynamics Dynamic programming Space vehicles