Henrik Schumacher

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—During the last few years, vehicle-to-vehicle (V2V) wireless communication has become a key objective for enabling future cooperative safety applications, such as intersection collision warning. In this paper, we present the results of a 5.9 GHz V2V performance measurement campaign at four different urban intersections under NLOS conditions using(More)
Accompanied by the continuous progression of the maturity of car-to-x communication protocols and corresponding system architectures, the need for integrated network simulation approaches which consider realistic channel modeling on the one hand and appropriate mobility models on the other hand becomes more and more observable. Moreover, in order to analyze(More)
In this paper, we present an integrated simulation approach featuring centralized and decentralized traffic management in urban areas. Our aim is to improve traffic flows by dynamic traffic management which is supported by vehicular communication interlinking centralized and decentralized decision making. We focus on traffic state estimation and the(More)
Although the potential of Vehicular Ad-Hoc Networks (VANETS) to improve road safety and traffic efficiency for next-generation vehicular traffic system has been well investigated and proved, the performance of vehicle-to-vehicle (V2V) communication, especially at urban intersections has not been clearly quantified. In this paper, we evaluate the effects of(More)
Available simulation studies on communication performance of Vehicular Ad-Hoc Networks (VANETs) in highway scenarios are based on different propagation models, often without empirical validation. In this paper, we present the results of a 5.9 GHz vehicle-to-vehicle (V2V) highway measurement campaign using commercial off-the-shelf hardware to gain insights(More)
There are several promising applications for car-to-x communication that aim at the improvement of traffic efficiency. With the increasing maturity of car-to-x communication systems, insights into the impacts of these applications on vehicular traffic are required. In this paper, we present a simulation study of traffic efficiency improvements that can be(More)
Let Φ : (M 1 , g 1) → (M 2 , g 2) be a diffeomorphism between Riemannian manifolds and Φ # : D(M 2) → D(M 1) the induced pull-back operator. The main theorem of this work is Theorem 4.1 which relates preservation of the p-Dirichlet energies ϕ → M i |dϕ| p dµ i under Φ # to isometric or conformal properties of Φ. More precisely: In case p = n, Φ # preserves(More)
In this diploma thesis, a non-linear Dirac operator and generalized Seiberg–Witten equations for 4-manifolds are studied. By using its relations to hyperKähler geometry, a pointwise Lichnerowicz formula for the non-linear Dirac operator is derived. This is used to obtain an a priori í µí°¿ ∞-estimate on the spinor part of solutions of the generalized(More)