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The AS-interface (AS-i) is a simple and cost-effective network solution connecting simple I/O devices to the upper fieldbus levels. A fully loaded AS-i Version I network with one master and 31 slaves has a maximum response time of 5 ms per I/O. The AS-Interface has been chosen as reference system for the development of a wireless fieldbus gateway, which will be presented in this paper. Standard modules...
Road accidents have a dramatic social and economic impact on the society, a situation that fostered the research of mechanisms for increasing road safety. Many of these mechanisms require the ability of the vehicles to communicate among each other and/or with fixed road-side stations. Due to the inherent mobility constraints, wireless technologies play a central role in this type of applications....
When trying to track down bugs using cyclic debugging, the ability to correctly reproduce executions is imperative. In sequential, deterministic, non-real-time software, this reproducibility is inherent. However, when the execution is affected by preemptive interrupts, this will have severe effects on the ability to reproduce program behaviors deterministically, since a reproduction requires the interrupts...
Many fields of the industrial automation can be already served by wireless technologies. Due to the different requirements regarding the reliability, latency, number of nodes, node density and range to communication systems there is no uniform standard for wireless communication covering all domains of automation. It is to be expected in the future on a strongly increasing number of radio technologies...
In this paper, the repair process for fault-tolerant industrial production lines is investigated. The type of failure may significantly affect the repair time because of travel time, customs,... A modified Markov model is developed that takes into account these different repair times. The availability of a two-machine production line is then calculated using this model and is compared to the availability...
A problem of inventory control for assembly systems is considered where the component lead times are random. A periodic ldquolot for lotrdquo policy for component supplying is studied. The decision variables are component planned lead times. The aim is to minimize the average holding cost for components while keeping a high customer service level for the finished product. Some properties and a lower...
In recent years, the fields of reconfigurable manufacturing systems, holonic manufacturing systems, multi-agent systems have made technological advances to support the ready reconfiguration of automated manufacturing systems. To help assess these advancements, a reconfigurability measurement process has been developed based upon the complementary ideas of reconfiguration potential and ease. This work...
Composite curing, a rapidly developing industry process, generates heavy costs when not properly controlled. Curing autoclaves require tight control over temperature that must be uniform throughout the curing vessel. This paper discusses how agent-based software can improve the robustness and reliability of the curing process by pushing control logic down to the lowest level of the control hierarchy...
The use of IEEE 802.11p for supporting intelligent transportation systems (ITS) enables enhancing the drive experience to provide vehicle users with useful information related to road efficiency and public safety. Safety services, such as collision or sudden hard braking warning, are used to improve passenger safety and reduce fatalities. Along with the delay-critical nature of those services, the...
The performance of Multivariable Step-Wise Safe Switching Iterative Feedback Tuning is studied for a constant turning force system under varying cutting conditions. The tuning technique does not use a plantpsilas model, neither nonlinear or approximate linearized, and is based on specific experiments performed on the closed-loop plant. Controller parameter tuning aims to achieve minimization of a...
We present a method for fine grain QoS control of multimedia applications. This method takes as input an application software composed of actions. The execution times are unknown increasing functions of quality level parameters. Our method allows the construction of a quality manager which computes adequate action quality levels, so as to meet QoS requirements for a given platform. These include requirements...
Due to continuous technology downscaling modern MPSoCs become more and more susceptible to the occurrence of internal errors in computational cores as well as in the on-chip-communication infrastructure. The usage of appropriate techniques is necessary to counteract these errors and thus preventing them from originating a system failure. In this paper we will explore the impact of fault tolerance...
Improved technology and economically feasible costs allow a widespread deployment of embedded systems in various application domains - ranging from integration into cars, industrial automation up to building automation. A sophisticated security architecture considering the challenging constraints on these systems and providing secure communication, secure software as well as physical security is needed...
This work, presents the design of a Joint State-Mode observer for SLS, where the state of both parts, continuous and discrete, are observed The continuous part is represented by a family of linear systems (LS) and the discrete part is represented by an interpreted Petri net (IPN), enlarging the class of systems that can be represented and adding structural information to the system. The design of...
The application of multivariable step-wise safe switching controllers (MSWSS) for climate control of a greenhouse is presented. The system of the greenhouse is described by a simplified model, incorporating heating and natural ventilation. The advantages of applying MSWSS on the greenhouse are presented and the performance of the algorithm is illustrated through simulation results. The application...
Differential evolution (DE) is a powerful population-based algorithm of evolutionary computation field designed for solving global optimization problems. The potentialities of DE are its simple structure, easy use, convergence speed and robustness. However, the control parameters and learning strategies involved in DE are highly dependent on the problems under consideration. Choosing suitable parameter...
The aim of this paper is to describe a multi-domain model-driven embedded systems design approach which is applicable to the domain of complex Industrial Automation and Control Systems (IACS). The special requirements of the industrial automation sector are taken into account by this novel approach, utilizing existing model-driven techniques. This is currently being developed in the FP7 Embedded Systems...
Several major challenges of todaypsilas industrial production, especially in supply chains and production networks with ongoing changes and critical customer demands, can be answered by introducing tracking and tracing services and extending them, over organizational borders, to the entire network in question. The pioneering track-and-trace solutions introduced by large companies can, due to their...
The categorization problem in object recognition is the assignment of semantic categories to objects or parts of objects. Here, the best categorization performance provide mammalian brain functions that motivate to partly mimic such a formation for the application to machine learning and automation. Curiosity and experimental willingness support human recognizing and detecting in relation to still...
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