Elektronik ve Haberleşme Mühendisliği Bölümü Yayın Koleksiyonu
Permanent URI for this collectionhttps://hdl.handle.net/20.500.12416/260
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Conference Object Dinamik Dağıtık Gerçek Zamanlı Endüstriyel İletişim Protokolü (d2gep) Gerçekleştirimi(2012) Gözcü, A. K.; Turan, U.; Schmidt, E. G.; Schmidt, K.Conference Object Citation - Scopus: 19Performance Evaluation of Flexray/Can Networks Interconnected by a Gateway(2010) Schmidt, E.G.; Alkan, M.; Schmidt, K.; Yürüklü, E.; Karakaya, U.The coexistence of both CAN and FlexRay networks in contemporary and future automobiles necessitates the use of FlexRay/CAN gateways that support the timely data exchange among the different networks. In this paper, we report on the implementation of such FlexRay/CAN gateway. Moreover, for the first time, we investigate appropriate network and gateway configurations that are beneficial for the overall network performance in the sense of small delays of gateway messages. © 2010 IEEE.Conference Object Citation - Scopus: 8Multi-Objective Decision Making Using Fuzzy Discrete Event Systems: a Mobile Robot Example(2010) Boutalis, Y.; Schmidt, K.In this paper, we propose an approach for the multi-objective control of sampled data systems that can be modeled as fuzzy discrete event systems (FDES). In our work, the choice of a "fuzzy" system representation is justified by the assumption of a controller realization that depends on various potentially imprecise sensor measurements. Our approach consists of three basic steps that are performed in each sampling instant. First, the current fuzzy state of the system is determined by a sensor evaluation. Second, the future fuzzy state is predicted for the possible control actions, and finally, a particular multi-objective weighting strategy allows to determine the control action to be applied. We demonstrate the features of our method by a mobile robot example. © 2010 IEEE.Conference Object Hierarchical Multitasking Control of Discrete Event Systems: Computation of Projections and Maximal Permissiveness(IFAC Secretariat, 2010) Cury, J.E.R.; Schmidt, K.; De Queiroz, M.H.This paper extends previous results on the hierarchical and decentralized control of multitasking discrete event systems (MTDES). Colored observers, a generalization of the observer property, together with local control consistency, allow to derive sufficient conditions for synthesizing modular and hierarchical control that are both strongly nonblocking (SNB) and maximally permissive. A polynomial procedure to verify if a projection fulfills the above properties is proposed and in the case they fail for a given projection an algorithm is proposed to find an extension of the set of events to be projected, in order to fulfill the sufficient conditions for SNB and maximally permissive hierarchical control.Conference Object Citation - Scopus: 7Abstraction-Based Control for Not Necessarily Closed Behaviours(IFAC Secretariat, 2011) Moor, T.; Schmidt, K.; Wittmann, T.This paper addresses abstraction-based supervisory control for plant and specification behaviours that are not necessarily ω-closed, i.e. plant behaviours that exhibit eventuality properties and specifications that impose eventuality properties on the closed loop. Technically, the core idea is to combine results from previous work on abstraction-based supervision of input-output behaviours with results on supervisory control of ω-languages. As our main result, we identify a controllability condition for the plant, that ensures a nonblocking closed-loop behaviour with a controller that has been obtained for a plant abstraction. © 2011 IFAC.Article Citation - WoS: 12Citation - Scopus: 17Abstraction-Based Verification of Codiagnosability for Discrete Event Systems(Pergamon-elsevier Science Ltd, 2010) Schmidt, K.In this paper, we investigate the verification of codiagnosability for discrete event systems (DES). That is, it is desired to ascertain if the occurrence of system faults can be detected based on the information of multiple local sites that partially observe the overall DES. As an improvement of existing codiagnosability tests that resort to the original DES with a potentially computationally infeasible state space, we propose a method that employs an abstracted system model on a smaller state space for the codiagnosability verification. Furthermore, we show that this abstraction can be computed without explicitly evaluating the state space of the original model in the practical case where the DES is composed of multiple subsystems. (c) 2010 Elsevier Ltd. All rights reserved.