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Modelling nonverbal communication in robotics is a crucial issue to improve Human Robot interactions (HRI). Among several nonverbal behaviours we focus in this article on unintentional rhythmic entrainment and synchronization which has been proven to be highly important in intuitive and natural Human Human communication. Hence, the rising question is whether or no this phenomenon can be reproduced...
This paper describes a trusted lightweight synchronisation protocol for wireless ad-hoc networks. The wireless ad-hoc network and wireless sensor networks is a large field of research. Their dynamic topologies make them difficult to synchronise (power consumption, slow convergence, accuracy). Moreover, these open networks are vulnerable to faulty nodes and attacks from malicious nodes. In this paper...
Industrial communication is on its way from field-bus to Ethernet. In an industry 4.0 scenario various applications and branches in automated manufacturing, process industry and intra logistics are affected. Here, Ethernet communication will not be limited to the communication between controllers and devices such as programmable logic controllers (PLC) and sensors and actors, but will also be applied...
This paper presents a new fractional-order hidden strange attractor generated by a chaotic system without equilibria. The proposed non-equilibrium fractional-order chaotic system (FOCS) is asymmetric, dissimilar, topologically inequivalent to typical chaotic systems and challenges the conventional notion that the presence of unstable equilibria is mandatory to ensure the existence of chaos. The new...
In the IEEE 802.15.4-2015 standard, Time Slotted Channel Hopping (TSCH) aims to guarantee high-level network reliability by keeping nodes time-synchronised. In order to ensure successful communication between a sender and a receiver, the latter starts listening shortly before the expected time of a MAC layer frame's arrival. The offset between the time a node starts listening and the estimated time...
This paper presents a new fractional-order model of a chaotic system that generates only stable equilibria. The proposed fractional-order chaotic system (FOCS) having exponential nonlinearity, is topologically inequivalent to typical chaotic systems and challenges the conventional notion of the presence of unstable equilibria to ensure the existence of chaos in fractional dynamics. This work investigates...
Product platforms are well-established in many industries in order to offer a wide variety of products while realizing economies of scale on the inside for development and production. Nevertheless a study performed by Laboratory for Machine Tools and Production Engineering (WZL) of RWTH Aachen University shows that most companies do not use release management to systematically introduce technical...
This paper deals with inverters which are to be synchronized to share the common load of microgrid. The microgrid under consideration is in OFF grid condition and hence one of the inverters is designed as master and the remaining are designed for slave mode of operation. A state-of-the-art synchronization strategy is developed for the initial synchronization of the inverter during startup period....
Interpersonal entrainment is an important and underexplored feature of musical performance. Better understanding of this phenomenon has important implications for musicology and for the understanding of joint action and coordination from a psychological perspective, and is likely also to be applicable in entertainment, educational, and therapeutic contexts. In order to achieve this, new methods of...
We want to give an overview of the German project cluster FAST aiming at a technological and economic breakthrough by means of real-time ability. FAST consist of around 80 partners, more than 19 projects and is scheduled from 2014 to 2020. The focus of this paper is put on visions for future research and applications for 2020 and beyond. Moreover, we present an example of a first achievement. A chip...
The objective comparison of hash-based set reconciliation algorithms for distributed replica repair is challenging. Each algorithm's behaviour can be tuned for a given use case, e.g. low bandwidth or computational overhead, using different sets of parameters. Changes on these parameters, however, often also influence the algorithm's accuracy in recognising differences between replicas and thus hinder...
Traffic engineering is a key in effective utilisation of the road network infrastructure. Simulation assists traffic engineers making informed decisions on how to operate and direct traffic within the road networks. These simulations are complex, generate big data and require high-powered computers, which can process information faster than real time, to ensure the results can be used to affect traffic...
A framework based on the gap metric and integral quadratic constraints (IQCs) is developed for analysing robust synchronisation of heterogenous linear time-invariant networks. Both the agents and the communication channels are allowed to be dynamic and unstable. Structural properties of the uncertainty are described by IQCs and exploited in synchronisation analysis as a means to reduce conservatism...
A general framework for the study of robust synchronisation in large-scale networks is provided. Agents are represented as a common nominal linear time-invariant (LTI) single-input-single-output (SISO) system with simple poles on the imaginary axis, subject to LTI SISO stable multiplicative perturbations. The agents exchange information in order to achieve output-synchronisation, namely steer their...
It has been a challenging task to deliver high-volume 3D multi-view media with spatial audio to users. The challenge stems from the availability of a large number of user equipment with different capabilities, range of viewing preferences, as well as diverse network characteristics. With the target of facilitating 3D media delivery to multiple users simultaneously and in a synchronised way with consistent...
Our focus is on a non-linear, time delayed, fluid model for Compound TCP (C-TCP) which is widely implemented in the current Internet. We couple this model with a Drop-Tail queue policy, currently deployed in routers, in two different limiting regimes: a small buffer and an intermediate buffer regime. We consider a topology where two distinct sets of long lived Compound flows, each regulated by separate...
Time and frequency synchronisation are significant parts of the cell-search procedure and one of the first processing blocks within a mobile communication system. Particularly for an OFDM transmission within an initial synchronisation process, the algorithm has to deal with carrier frequency offsets up to several subcarrier spacings. To be able to still operate under those conditions, the cell-search...
The relative phase position of AC voltages and currents in different parts of an electric power system determines the stability and the dynamic performance of the system. The introduction of phasor measurement units (PMUs) in power systems significantly improves the possibilities for monitoring and analyzing power system dynamics. In this paper a Recursive DFT algorithm is adopted for the development...
Computational Fluid Dynamics simulations require an enormous computational effort if a physically reasonable accuracy should be reached. Therefore, a parallel implementation is inevitable. This paper describes the basics of our implemented fluid solver with a special aspect on the hierarchical data structure, unique cell and grid identification, and the neighbourhood relations in-between grids on...
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