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 5.9GHz V2V performance measurement campaign at four different urban intersections under NLOS conditions using commercial(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)
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)
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)
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)
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)
Let Φ : (M1, g1)→ (M2, g2) be a diffeomorphism between Riemannian manifolds and Φ# : D(M2)→ D(M1) the induced pull-back operator. The main theorem of this work is Theorem 4.1 which relates preservation of the p-Dirichlet energies φ 7→ ∫ Mi |dφ| dμi under Φ# to isometric or conformal properties of Φ. More precisely: In case p = n, Φ# preserves the(More)
Vehicle-to-Vehicle (V2V) communication is envisioned to enable a vast range of road safety, traffic efficiency and infotainment applications for next-generation vehicular traffic. In this paper, we investigate the effects of vegetation on the performance of V2V communication based on a 5.9GHz measurement campaign conducted at different urban and rural(More)
Vehicular-Ad hoc Networks have the potential to achieve high levels of safety, efficiency and comfort on road. VANET is a campaign towards Intelligent Transport System (ITS). VANET applications are time critical and the QoS constraints require the designing and evaluation of routing protocols to be done in realistic environment. The main purpose of this(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 L∞-estimate on the spinor part of solutions of the generalized(More)