Fixed-priority preemptive scheduling is a popular scheduling scheme for real-timesystems. This is accompanied by a vast amount of research on how to analyse and check whether these systems satisfy their real-time req...
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Vehicular Ad-hoc Networks are a very interesting self-organizing communication system that can make the traffic on our roads much safer. A lot of aspects of the behavior of these systems are studied using network simu...
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ISBN:
(纸本)9781565553415
Vehicular Ad-hoc Networks are a very interesting self-organizing communication system that can make the traffic on our roads much safer. A lot of aspects of the behavior of these systems are studied using network simulation frameworks. While the upper communication layers of Vehicular Ad-hoc Networks are mainly simulated according to their specifications, in this paper we will highlight weak points in these simulations. They occur due the fact that the layers below the link layer are considered very rarely and are also almost neglected by the commonly used network simulation frameworks. This can potentially lead to inaccurate simulation results which can be fatal when studying safety relevant applications or application with real-time constraints. In this work in progress paper we are going to propose an approach to get this under control.
The coded communications using non-coherent orthogonal modulation and capacity-approaching binary channel codes namely low-density parity check code (LDPC) and turbo code are investigated in this paper with the focus ...
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ISBN:
(纸本)9781450332774
The coded communications using non-coherent orthogonal modulation and capacity-approaching binary channel codes namely low-density parity check code (LDPC) and turbo code are investigated in this paper with the focus on the main three characteristic effects of an underwater channel, namely, multi-path propagation, Doppler spread and ambient noise. Additionally, a new method was implemented and tested successfully to identify and eliminate the highamplitude noise from the received dataset.
Load balancing is one of the central problems that have to be solved in parallel computation. Here, the problem of distributed, dynamic load balancing for massive parallelism is addressed.A new local method, which rea...
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Load balancing is one of the central problems that have to be solved in parallel computation. Here, the problem of distributed, dynamic load balancing for massive parallelism is addressed.A new local method, which realizes a physical analogy to equilibrating liquids in multi-dimensional tori or hypercubes, is presented. It is especially suited for communication mechanisms with low set-up to transfer ratio occurring in tightly-coupled or SIMD systems. By successive shifting single load elements to the direct neighbors, the load is automatically transferred to lightly loaded *** to former methods, the proposed Liquid model has two main advantages. First, the task of load sharing is combined with the task of load balancing, where the former has priority. This property is valuable in many applications and important for highly dynamic load distribution. Second, the Liquid model has high efficiency, Asymptotically, it needsO(D K Ldiff) load transfers to reach the balanced state in aD-dimensional torus withKprocessors per dimension and a maximum initial load difference ofLdiff. The Liquid model clearly outperforms an earlier load balancing approach, the *** a survey of related research, analytical results within a formal framework are derived. These results are validated by worst-case simulations in one- and two-dimeasional tori with up to two thousand processors.
Performing fine manipulations with multifingered robot hands makes high demands on the control algorithms and the speed of the control computer. Mainly non-linear friction problems and plant uncertainties require inte...
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With high speed control applications it is often very difficult to achieve the aspired timing of the control algorithm using just one processor. This is true especially if the system is complex or very large. In this ...
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With high speed control applications it is often very difficult to achieve the aspired timing of the control algorithm using just one processor. This is true especially if the system is complex or very large. In this paper we discuss advantages and disadvantages of a new system architecture using many processors of which each one is specialised for one part of the algorithm. A tailorable parallel computer architecture which we developed to cope with the problems of parallelisation of control algorithms is presented. Finally examples from the field of robotics and the performance of the prototype computer is presented.
The synchronous language Esterel is an established language for developing reactive systems. It gives an abstract, well-defined and executable description of the application, and can be synthesized into hardware and s...
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Vertical Take-Off and Landing (VTOL) capable Mini Unmanned Aerial Vehicles (MUAV) are an economic alternative to real helicopters if local aerial pictures or other aerial measurements are needed. With electronic stabi...
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In contrast to a hierarchical and centralized structure, distributed or decentralized control architectures reveal their main advantages when it is necessary to enhance the system, to integrate components, and to main...
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In contrast to a hierarchical and centralized structure, distributed or decentralized control architectures reveal their main advantages when it is necessary to enhance the system, to integrate components, and to maintain the system. The main disadvantage of not centralized architectures is having to make sure that the system will fulfill an overall or global goal. To investigate these problems, a distributed control architecture for intelligent systems was developed at the University of Karlsruhe. In this paper, the methods for dead-lock-free coordination and cooperation are explained.
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