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IEEE International Conference on Self-Adaptive and Self-Organizing systems Workshops, SASOW

作者： Jan Kantert Christian Ringwald Georg Von Zengen Sven Tomforde Lars Wolf Christian Muller-Schloer Institute of Systems Engineering Leibniz University Hanover Hanover Germany Inst. of Oper. Syst. & Comput.Networks Technische Universitat Braunschweig Braunschweig Niedersachsen DE Organic Computing Group Augsburg University Augsburg Germany Institute of Operating Systems and Computer Networks TU Braunschweig Braunschweig Germany

In typical settings for Wireless Sensor networks (WSNs), a potentially large set of nodes operates under strict requirements concerning energy consumption and packet delivery success. If non-reliable or even malicious nodes participate, standard protocols can suffer in performance which may result in a limited functionality of the whole network. This paper addresses this issue by establishing end-to-end trust relationships among nodes with the goal to isolate malicious nodes. In order to increase the scalability towards large-scale system sizes, we extend the mechanism with an adaptive signature mechanism as basis for the trust value distribution technique. Evaluations cover a theoretical discussion and a simulation-based setting. The results show that malicious nodes can be quickly isolated. Thereby, the already low additional effort for trust can be reduced significantly compared to reference solutions.

关键词： Routing Wireless sensor networks Standards Measurement Routing protocols Conferences Hardware

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High Density Valet Parking Using k-Deques in Driveways

High Density Valet Parking Using k-Deques in Driveways

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IEEE Intelligent Vehicles Symposium

作者： Holger Banzhaf Frank Quedenfeld Dennis Nienhuser Steffen Knoop J. Marius Zollner Robert Bosch GmbH Corporate Research Driver Assistance Systems and Automated Driving 71272 Renningen Germany University of Technology Braunschweig Institute of Operating Systems and Computer Networks 38106 Braunschweig Germany Research Center for Information Technology (FZI) 76131 Karlsruhe Germany

ISBN: (纸本)9781509048052

Advances in autonomous driving and the introduction of automated valet parking allow the optimization of parking space. A future concept is high density valet parking with the potential to either reduce the extensive land use for parking or increase the capacity of existing parking facilities. This paper presents a novel approach that integrates high density parking into an existing parking lot, by explicitly making use of parking in the driving lane and reducing the shunting operations per vehicle. The proposed parking scheme allows vehicles to park either perpendicular to the driveway or in double-ended queues with k parking spots (k-deque) on the side of the driving lane. Leveraging the potential of such a layout increases the capacity of a parking lot by up to 25%, while keeping the maximum number of shunts per car below [k/2]+1 between entry and exit. A dynamic simulation verifies the theoretical analysis and compares the performance of different deque lengths with respect to the distances traveled and the number of shunts per vehicle.

关键词： Automobiles Layout Optimization Urban areas Sensors Geometry Vehicle dynamics Parking Drive ways layouts Vehicle dynamics Automobiles urban area parking lots Cars geometry Sensors Shunts (electrical) vehicle High density

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Integration of cyber-physical HVAC systems in Incremental Manufacturing to improve Energy Efficiency and Air Quality 54

Integration of cyber-physical HVAC systems in Incremental Ma...

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54th CIRP Conference on Manufacturing Ssystems, CMS 2021

作者： Vogt, Marcus Schlichter, Jan Aschersleben, Franziska Abraham, Tim Wolf, Lars Herrmann, Christoph Chair of Sustainable Manufacturing and Life Cycle Engineering Institute of Machine Tools and Production Technology Technische Universität Braunschweig Langer Kamp 19b Braunschweig38106 Germany Chair of Production Technologies and Process Automation Institute of Machine Tools and Production Technology Technische Universität Braunschweig Langer Kamp 19b Braunschweig38106 Germany Institute of Operating Systems and Computer Networks Technische Universität Braunschweig Mühlenpfordtstraße 23 Braunschweig38106 Germany

Heating, ventilation and air conditioning (HVAC) systems in a production environment ensure safe and comfortable environmental conditions and require a significant amount of final energy in the industry. In this paper a complete cyber-physical HVAC system is presented, which is implemented in an incremental production environment to ensure these conditions. Incremental manufacturing is a concept for a flexible production system that combines additive manufacturing, subtractive manufacturing processes and other production technologies. With the cyber-physical HVAC system, energy efficiency, air quality and thermal conditions can be improved in the incremental production environment, by providing decision support, greater transparency and enabling model-predictive control in real time. © 2021 Elsevier B.V.. All rights reserved.

关键词： Energy efficiency

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Using context prediction for self-management in ubiquitous computing environments

Using context prediction for self-management in ubiquitous c...

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Consumer Communications and Networking Conference, CCNC IEEE

作者： M. Mulvenna C. Nugent Xiaoyuan Gu M. Shapcott J. Wallace S. Martin School of Computing and Mathematics Faculty of Engineering University of Ulster Newtownabbey UK Institute of Operating Systems & Computer Networks Technische Universität Brannschweig Brunswick Germany School of Health Sciences Faculty of life and Health Sciences University of Ulster Newtownabbey UK

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Undervolting in Real World WSN Applications: A Long-Term Study

Undervolting in Real World WSN Applications: A Long-Term Stu...

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International Conference on Distributed Computing in Sensor systems (DCOSS)

作者： Ulf Kulau Stephan Rottmann Sebastian Schildt Johannes van Balen Lars Wolf Institute of Operating Systems and Computer Networks TU Braunschweig Braunschweig Germany Inst. of Oper. Syst. & Comput. Networks Tech. Univ. Braunschweig Inst. of Oper. Syst. & Comput. Networks Technische Universitat Braunschweig Braunschweig Niedersachsen DE Inst. of Oper. Syst. & Comput. Networks Tech. Univ. Braunschweig Braunschweig Germany

ISBN: (纸本)9781509014613

The fault-tolerant character of WSN protocols and applications that do not assume completely reliable systems legitimize undervolting - a highly efficient energy management technique where the supply voltage is set below the minimum specifications. As has been shown in earlier work, by using thereliable IdealVolting undervolting scheme the lifetime of WSN applications can be increased significantly while keeping the node in a safe state even under rough environmental conditions. To show the usability of undervolting in a real world WSN deployment, we performed a long-term study of IdealVolting in a Smart Farming application. All measurements were performed on a generic outdoor testbed for WSNs (PotatoNet) which is also presented within this paper. We collected a long-term dataset of a WSN running for one farming season on a potato fieldto compare the reliability and performance characteristics of IdealVolting against a regular powered WSN.

关键词： Wireless sensor networks Servers Reliability Uplink Hardware Ports (computers) computer network reliability

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Letter Computation of Constrained Multicast Trees Using a Genetic Algorithm

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Transactions on Emerging Telecommunications Technologies 2008年第5期10卷

作者： Quan Sun Horst Langendoerfer Institute of Operating Systems and Computer Networks TU Braunschweig Bueltenweg 74/75 38106 Braunschweig Germany

This paper shows that the genetic algorithm can be used to solve the delay-constrained least-cost least-inter-destination-delay-variation multicast problem efficiently. The proposed genetic algorithm performs well whe...

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Integration of cyber-physical HVAC systems in Incremental Manufacturing to improve Energy Efficiency and Air Quality

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Procedia CIRP 2021年 104卷 482-487页

作者： Marcus Vogt Jan Schlichter Franziska Aschersleben Tim Abraham Lars Wolf Christoph Herrmann Chair of Sustainable Manufacturing and Life Cycle Engineering Institute of Machine Tools and Production Technology Technische Universität Braunschweig Langer Kamp 19b 38106 Braunschweig Germany Institute of Operating Systems and Computer Networks Technische Universität Braunschweig Mühlenpfordtstraße 23 38106 Braunschweig Germany Chair of Production Technologies and Process Automation Institute of Machine Tools and Production Technology Technische Universität Braunschweig Langer Kamp 19b 38106 Braunschweig Germany

关键词： Cyber physical HVAC systems physical simulation model energy transparency energy efficiency air quality

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Network Monitoring with Asynchronous Notifications in Web Service Environments

Network Monitoring with Asynchronous Notifications in Web Se...

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ITG/GI-Fachtagung, Kommunikation in Verteilten Systemen

作者： Torsten Klie Florian Muller Stefan Fischer Technische Universität Braunschweig Institute of Operating Systems and Computer Networks Mühlenpfordtstr. 23 38106 Braunschweig Germany Universität Düsseldorf Institute of Computer Science / OS Department Universitätsstr.1 40225 Germany Universität zu Lübeck Institute of Telematics Ratzeburger Allee 160 23538 Germany

With the ongoing growth of the Internet, a reliable communications infrastructure becomes more and more important. To monitor large networks, asynchronous notifications are needed to inform management systems about critical events. The SNMP framework provides Traps which have been used for monitoring successfully for many years. However, due to shortcomings of SNMP, XML and Web services get more and more attention from the network management community. If the new technologies should replace the existing ones, they must also provide asynchronous notifications. In this paper, we describe notification solutions in traditional as well as in new management frameworks. Moreover, we compare them with a simple approach based on Web services we have implemented.

关键词： Web services Protocols Subscriptions Relays Monitoring XML IP networks

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INBED: INEXPENSIVE NODE FOR BED-EXIT DETECTION: A WEARABLE FALL PREVENTION SYSTEM

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Innov Aging 2017年第SUPPL 1期1卷 1016-1016页

作者： N. Jaehne-Raden U. Kulau K. Wolf H. Meyer zu Schwabedissen M. Marschollek Peter L. Reichertz Institute for Medical Informatics University of Braunschweig - Institute of Technology and Hannover Medical School Hanover Lower Saxony Germany Institute of Operating Systems and Computer Networks Braunschweig Lower Saxony Germany Clinic for rheumatism and diseases of the elderly at the Municipal Hospital Braunschweig Braunschweig Lower Saxony Germany

Age-related falls are a widespreaded and expensive issue of society and with this a big challenge of gerontological research. Hence we present INBED - an inexpensive, modular and body-worn (medio-femoral) fall prevention system. Compared to existing solutions, INBED offers a more proper solution to prevent falls in clinical and elderly care environments. The INBED detects several events such as getting up from a sitting or lying position. These events are broadcasted wirelessly to notify the nursing stuff, so that they can assist the respective care recipient accordingly. In further consequence, highly critical fall events can be avoided due to the early alert of the nursing staff. The INBED can replace the commonly used belt or bed rail systems for high risk fall patients. Thus, the personal range of movement and the self-determination of the patient will be supported without reducing the sense of protection. INBED itself is a approx. 2x2cm wearable device that contains several sensors, a microcontroller unit and a wireless radio transceiver. Development objectives were: - development of a reliable and cost-effective solution for a sensor-based uprise-detection for fall prevention established by first research results with different sensor prototypes. - apart from the function of immediate uprise-detection, the system can also recognize states of restlessness occurring in advance of patient’s rising, so that the caregiver can intervene before the first uprise. - in addition to above-mentioned functions, the system can be used to implement a virtual fence. Patients can be protected from risk areas, e.g. stairs, by sending a dedicated event.

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