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  • 1.
    Khan, Saifullah
    et al.
    Carl von Ossietzky University of Oldenburg, Germany.
    Alam, Muhammad
    Xi'an Jiaotong Liverpool University, Suzhou, China.
    Fränzle, Martin
    Carl von Ossietzky University of Oldenburg, Germany.
    Muellner, Nils
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Chen, Yuanfang
    Dalian University of Technology, China.
    A Traffic Aware Segment-based Routing protocol for VANETs in urban scenarios2018In: Computers & electrical engineering, ISSN 0045-7906, E-ISSN 1879-0755, Vol. 68, p. 447-462Article in journal (Refereed)
    Abstract [en]

    Vehicular ad-hoc networks (VANETs) offer a diverse set of applications and therefore gain more and more attention from both academic and industrial communities. However, the deployment of VANETs is not very straight-forward. One challenge is highlighted by an uphill task of establishing and subsequently sustaining a robust communication. The need to obviate extra relay infrastructure in dynamically fluctuating topologies plus concurring shielding obstacles only magnifies this arduous task. In this context, information about traffic-density and about its estimated progress are valuable assets to tackle this issue. This paper proposes a novel routing protocol called Traffic Aware Segment-based Routing (TASR) protocol. The proposed protocol comprises two major parts: 1) Real-time vehicular traffic information for route selection allows for calculating the Expected Connectivity Degree (ECD) on different segments, and 2) a new forwarding method based on geographical information transfers packets from source to destination node. The new metric ECD takes vehicle densities into account, estimating the connectivity on each segment and thus the connectivity of nodes and data delivery ratio for transmitting packets. Furthermore, extensive simulations help analyzing the efficiency of TASR, indicating that it outperforms competing routing protocols.

  • 2.
    Muellner, Nils
    et al.
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Khan, S.
    Carl von Ossietzky Universität, Oldenburg, Germany .
    Rahman, M. H.
    Carl von Ossietzky Universität, Oldenburg, Germany .
    Afzal, Wasif
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Saadatmand, M.
    Swedish Institute of Computer Science, Sweden .
    Simulation-Based Safety Testing Brake-by-Wire2017In: Proceedings - 10th IEEE International Conference on Software Testing, Verification and Validation Workshops, ICSTW 2017, 2017, p. 61-64Conference paper (Refereed)
    Abstract [en]

    Mechanical systems in cars are replaced by electronic equivalents. To be authorized for the road, validation that the replacements are at least as good as the old systems is required. For electronic braking systems (brake-by-wire), this goodness translates to safety in terms of maintaining timing constraints. Yet, in the future, the safety of braking maneuvres will depend, not only, on electronic brakes, but also on cooperative driving maneuvres orchestrated among many cars. Connecting both brake-by-wire on the microscopic level with cooperative braking on the macroscopic level allows for determining safety on a broader scale, as both systems feed from the same resource: Time. This paper discusses work-in-progress, introducing and combining two threads: electronic brakes and cooperative braking. Discussing safety on two levels simultaneously motivates connecting a Simulink model of an electronic brake-by-wire system with the traffic simulator SUMO for conducting the required combined validation. How safe is a car in relation to a given maximal braking distance? What is the optimal distribution of reaction time between electronic brakes and cooperative braking? The validation focuses on non-functional safety limited by temporal constraints (translated to braking distance). It can be exploited in an early validation approach to help reduce costs of more expensive real world experimentation. It can also determine the boundaries at which sufficient safety can be guaranteed. 

  • 3.
    Ninh Thi Thanh, Tam
    et al.
    National Academy of Education Management, Vietnam.
    Tran, Hung Vinh
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Muellner, Nils
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Probabilistic Communication in Car Platoons2018In: International Conference on Advanced Technologies for Communications ATC, Ho Chi Minh, Vietnam: IEEE , 2018, p. 146-151Conference paper (Refereed)
    Abstract [en]

    Autonomously driving vehicles appeared on the canvas of science in the middle of the twentieth century and have since then been the subject of many generations of researchers. One application of autonomous driving is platooning, where cars autonomously follow each other in very close distance. This application is motivated by fuel savings, labor decrease, increase in road capacity and higher safety. To achieve platooning capability, vehicles require sensors, intelligent processing systems, and communication devices. This paper provides a study in which cars communicate to measure the system performance in terms of successful message transmission probability, also referred to as the integrity of wireless communication. The communication is one crucial part of the chain of the safety functionality of an orchestrated braking maneuver in a platoon, located between the car initiating the braking and all other members of the platoon. The numerical results target the influence of parameters like transmission power, channel gain, interference noise, and total number of involved vehicles

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  • 4.
    Urvantsev, Anton
    et al.
    Mälardalens högskola, Vasteras, Sweden; ABB AB, Västerås, Sweden.
    Johansson, M. E.
    ABB AB, Västerås, Sweden.
    Muellner, Nils
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Seceleanu, Tiberiu
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Experiencing technology independence2019In: Proceedings - International Computer Software and Applications Conference, IEEE Computer Society , 2019, p. 153-158Conference paper (Refereed)
    Abstract [en]

    In this paper we present an embedded systems design flow, supporting variations in technology — hardware vs. software — at implementation time. The work builds on seasoned and new approaches, tools and techniques, such as software production lines, FPGA design, and high level synthesis. We define the necessary context for such a design flow to succeed, and introduce supporting tools and interfaces to enable the designer to take decisions, which are further automatically transferred into the synthesis phases. We exemplify our solutions on a motor controller design, considering several features that are potentially required to be implemented, and where all the elements are possible to be implemented either as hardware or software modules.

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